CA1151596A - Process and apparatus for production of alveolar modules - Google Patents
Process and apparatus for production of alveolar modulesInfo
- Publication number
- CA1151596A CA1151596A CA000359480A CA359480A CA1151596A CA 1151596 A CA1151596 A CA 1151596A CA 000359480 A CA000359480 A CA 000359480A CA 359480 A CA359480 A CA 359480A CA 1151596 A CA1151596 A CA 1151596A
- Authority
- CA
- Canada
- Prior art keywords
- channels
- rows
- extrusion
- module
- spinneret
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
- B28B3/26—Extrusion dies
- B28B3/269—For multi-channeled structures, e.g. honeycomb structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/11—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels comprising two or more partially or fully enclosed cavities, e.g. honeycomb-shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/695—Flow dividers, e.g. breaker plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/06—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material
- F28F21/065—Constructions of heat-exchange apparatus characterised by the selection of particular materials of plastics material the heat-exchange apparatus employing plate-like or laminated conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
- F28F7/02—Blocks traversed by passages for heat-exchange media
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00453—Recording involving spectral or photochemical hole burning
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2533—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising resins
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/146—Laser beam
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24149—Honeycomb-like
Abstract
ABSTRACT OF THE DISCLOSURE
Process for the production of alveolar modules comprising rows of parallel channels, certain of which issue onto the sidewalls of the module, wherein it consists of producing the module by extrusion using at least two independent systems, each producing rows of identical channels, whereby the formation of one of the systems is interrupted when the rows of channels being produced is to issue onto the sidewalls of the module.
The apparatus for performing this process comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complementary of the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complemen-tary of the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another.
Process for the production of alveolar modules comprising rows of parallel channels, certain of which issue onto the sidewalls of the module, wherein it consists of producing the module by extrusion using at least two independent systems, each producing rows of identical channels, whereby the formation of one of the systems is interrupted when the rows of channels being produced is to issue onto the sidewalls of the module.
The apparatus for performing this process comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complementary of the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complemen-tary of the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another.
Description
~s~s96 PROCESS FOR THE PRODUCTION OF ALVEOLAR MODULES
BACKGROUL~D OF THE INVENTION
The invention relates to a process for the production of alveolar or honeycomb-like modules comprising rows of parallel channels, certain of which issue onto the sidewalls o~ the mo~ule, as well as to an apparatus for perorming this process.
Numerous industrial constructions and systems utilize alveolar modules comprising rows of parallel channels in which in general at least two different fluids flow. Modules of this type are in particular encountered in heat ~xchangers, as well as in ultra-filtration units.
In all these constructions, the fluid flow in adjacent channels have very small cross-sections.
It is therefore difficult to separate these fluids during their introduction into the module and during the removal therefrom. In general, this separation is brought about by displacing the inlet and outlet from certain of the rows ofchannels with respect to the ends of the module, so as to give access to said rows of channels through the sidewalls of the inodule.
- At present, alveolar modules of this type are manufactured in a number of stages. The first stage is constituted by the manufacture of the actuaI
module, more particularly by extrusion. This first stage is followed by stages involving the machining of the ends of the module made either mechanically or ultra-sonically and this serves to give access to certain of the rows of channels by openings made in ~5159~i the outer side~alls of the module. Thus, the manufacture of alveolar modules o~ this type is relatively long, difficult and costly. Moreover, in certain special applications, it is desirable that lateral access to certain of the rows of channels does not take place level with the ends of the modules and instead takes place in an area which is relatively remote from said ends.
BRIEF SUMMARY OF THE INVENTION
The invention relates to a process making it possible to manufacture alveolar modules in which certain of the rows of channels issue onto the side-walls of the module, either level with the ends of the latter, or in an area remote from said ends. This process is particularly simple, rapid and easy to perform, because it involves a single stage only which is superimposed on the extrusion stage in conventional production processes. The invention also relates to an apparatus which is particularly well suited for the realisation of this process. ~
According to the invention, this object is achieved by a process for the production of alveolar modules comprising rows of parallel channels9 certain of which issue onto the sidewalls of the module, wherein it consists of producing the module by extrusion using at l~ast two independent systems, each producing rows of identical channels, whereby the formation of one of the systems is interrupted when the rows of channels being pro~uced is to issue onto the sidewalls of the0 module. Preferably, the channels have a square or ~5~S96 rectangular cross-se~tiOn.
According to a first constructional variant of the invention, each system produces by extrusion the lateral and t~ansverse walls of the rows of corresponding channels.
According to a second constructional variant of the invention a first of said systems produces by extrusion the transverse walls of the rows of channels which are to issue onto the sidewalls of the module and the second system produces by extrusion the lateral and transverse walls of the ~her rows of channels.
The invention also relates to an appara-tus for performing this process, ~herein it comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complemen-tary of the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complementary of the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another.
According to another feature of the invention, the second spinneret is displaced relative to the first spinneret in the direction defined by -the parallel channels of the module to be produced.
According to a preferred embodiment of the invention, the extrusion material supply means incor-porate in each case a press plunger which forces the extrusion material through -the corresponding spinnere~
BRIEF DESCRIPTION OF THE DRAWINGS
... .
The invention is described in greater de-tail hereinafter relative to non-limitative embodiments and the attached drawings, wherein show:
Fig 1 a perspective view of an alveolar module produced according to the process of the invention;
Fig 2 a diagrammatic view showing an apparatus permitting the production of the alveolar module of Fig l; and Fig 3 is a diagrammatic view showing a constructional variant of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The alveolar module of Fig 1 is designated by the general reference numeral 10 and comprises rows 12 of parallel channels 14 in which flow a first fluid and rows 16 of parallel channels 18 in which flows a second fluid. The channels14 and 18 are linear and parallel to one another and extend longitudinally in module 10 so as to issue at each of the ends of the latter.
Channels 14 and 18 have a cross-section (as shown in Fig 1) or a rectangular cross-section and the dimensions of the sides of said channels do not exceed 3mm. Consequently, the separation of the fluids circu-lating in channels 14 and 18 level with the ends of module 10 causes problems which are generally solved by displacing the ends of the rows of channels 16 relative to the rows of channels 12 so as to permit the fluid circulating in rows of channels 16 to enter and leave via the sidewalls of module 10, whilst the fluid circulating in rows of channels 12 is introduced and removed by the ends of said module.
According to the invention, the displacements `~3 ~51596 between the ends of the rows of channels 12 and 16 are obtained directly during the manufacture by extrusion of module 10 and no longer by supplementary machining as was hitherto necessary.
As illustrated in Fig 2, this result is obtained by manufacturing the module by extrusion by means of an apparatus incorporating two independent extrusion systems 20 and 22 respectively forming the rows of channels 12 and 16 of the module.
More specifically, each of the systems 20 and 22 comprises independent extrusion material supply means constituted in the present embodiment by two plungers 24 and 26. Each of the plungers 24 and 26 varies the volume of a chamber 28, 30, into each of which the extrusion ~aterial is previously introduced - in ~e form of a spinning bar. The reduction in thè
volume of each of the chambers 28 and 30 caused by the displacement of plunger 24, 26 drives the paste-like extrusion material into passages 38, 40 issuing respectively into two spinnerets 42 and 44.
Spinneret 42 produces by extrusion rows of channels 12 and to this end comprises the same number of separate parts as the module to be produced has rows of channels 12. Each part of the spinneret 42 defines sidewalls 4b and not shown ends defining in cross-section a rectangular shape, whose dimensions correspond to the dimensions of each row of channels, plus the thickness of the walls of said channels.
Spinneret 42 also has masks or covers 48 serving to produce the actual channels 14.
f ~ ~L5~596 spinneret 44 is displaced with respect to spinneret 42 in the direction defined by the parallel channels of the module to be produced. It essen-tially comprises rectangular outer walls 50 extending the outer walls 46 of spinneret 42 corresponding to the outer sidewalls of module 10. Spinneret 44 also has masks or covers 52, whose dimensions correspond to the internal dimensions of channels 18.
According to a first constructional variant of the invention as illustrated in Figure 3, each of the spinnerets 42 and 44 serves both to produce the lateral and transverse walls of the rows of channels 12 and 16 respectively. To this end, the spacing between the lateral walls 46 of two parts of the spinneret 42 for producing two adjacent rows 12 exceedsthe width of masks 52 of the second spinneret 44 by a value corres-ponding to the thickness of each of the lateral walls of the row of channels 16 produced by spinneret 44 between said two rows of adjacent channels 12. This variant has the disadvantage of varying the thickness of the walls separating adjacent channels 14 and 18, depending on whether channels 18 do or do not issue onto the sidewalls of the module.
For this reason and in accordance with a second embodiment of the invention shown in Fig. 2, the width of the mask 52 of the second spinneret 44 is preferably equal to the distance separating the walls 46 of two parts of the spinneret 42 producing two adjacent rows of channels 12. As a result, spinneret 44 only produces the transverse walls of the rows of ~5~596 channels 16, i.e. the walls separating each of the channels 18 of one and the same row. The thickness of the walls sep~ra~ing adjacent channels 14 and lg is then constant within the module 10.
In one or the other of these embodimen-ts, -the thickness of the walls is between 100 ~ and 200 ~.
The alveolar module of Fig 1 is produced by means of the apparatus of Fig 2 in the following manner. Each of the extrusion systems 20 and 22 can be used independently of one another in such a way that the manufacture of the module can be carried out, for example, by using only the plunger of system 20 in order to displace the pasty material in chamber 28 through passages 38 up to the spinneret 42 in such a way as to form rows of channels 12 separated from one another by a distance corresponding to the width of the channels in the represented variant.
The extruded paste reaching the level of spinneret 44 is sufficiently cool to prevent it flowing 2Q or creeping level therewith and the plunger 26 of the second syste;~ 22 can then be put into operation in order to displace through passages 40 the pasty material in chamber 30 towards spinneret 44. This controls the formation of the t~ansverse walls of the channels 18 connecting -the adjacent rows of channels 12 and in this way forming said channels 18. Obviously, if the material extruded by the first spinneret 42 is sufficiently cool on reaching the spinneret 44 to prevent any creep or flow thereof, its temperature is still sufficiently high for the bond or connection between the transverse walls of cha~nels 18 and the rows of channels 12 to be correctly effected.
~ 6 According to the invention, when the rows of channels 16 have to issue onto the sidewalls of module lO, it is merely necessary to interrupt the plunger 26 of extrusion system 22 to ensure that the pasty material in chamber ~0 is no longer moved towards spinneret 44 by passages 40. Thus, only the rows of channels 12 continue to be produced by extrusion by means of system 20. The rows of channels 16 or 12 can then issue onto the sidewalls of the module at any point.
The extrusion material used can be constituted by any conventional extrusion material which complies - with the conditions of use of the manufactured cell.
~referably, this material is constituted by metallic oxide particles, such as alumina, magnesia, titanium dioxide and silica and these are coated, for example~
with organic bin ders and preferably thixotropic binders such as the mixture of seresine and terpinol. Other binders, such as water-based binders, particularly of the tragacanth type for ther~moplastic binders can also be used.
~ he material can also be formed from another substance such as a mixed oxide, a flouride ana in particular an alkaline earth fluoride, or a metal powder.
The constituent is mixed in per se known manner with an appropriate binder, so that the physical characteris-tics of the mixer are well adapted to the extrusion con-ditions.
~bviously, the invention is not limited to the embodiment described hereinbefore and in fact ~51596 numerous variants thereof are possible. Thus, the extrusion appara~us can have the same number of independent systems as there are rows of different parallel channels in the module to be produced and the e~trusion material supply means, together with the spinnerets of each system can be modified and replaced by any known equivalent means.
Moreover, -the rows of channels of different types do not necessarily alternate as in the represented embodiment and the rows of channels which issue at the end of the module by one of their ends can issue onto the walls of the modules by their other ends, provided that the spinneret of each of the extrusion systems produces both the lateral and transverse walls of the corresponding rows of channels according to the first constructional variant described hereinbefore.
_g_
BACKGROUL~D OF THE INVENTION
The invention relates to a process for the production of alveolar or honeycomb-like modules comprising rows of parallel channels, certain of which issue onto the sidewalls o~ the mo~ule, as well as to an apparatus for perorming this process.
Numerous industrial constructions and systems utilize alveolar modules comprising rows of parallel channels in which in general at least two different fluids flow. Modules of this type are in particular encountered in heat ~xchangers, as well as in ultra-filtration units.
In all these constructions, the fluid flow in adjacent channels have very small cross-sections.
It is therefore difficult to separate these fluids during their introduction into the module and during the removal therefrom. In general, this separation is brought about by displacing the inlet and outlet from certain of the rows ofchannels with respect to the ends of the module, so as to give access to said rows of channels through the sidewalls of the inodule.
- At present, alveolar modules of this type are manufactured in a number of stages. The first stage is constituted by the manufacture of the actuaI
module, more particularly by extrusion. This first stage is followed by stages involving the machining of the ends of the module made either mechanically or ultra-sonically and this serves to give access to certain of the rows of channels by openings made in ~5159~i the outer side~alls of the module. Thus, the manufacture of alveolar modules o~ this type is relatively long, difficult and costly. Moreover, in certain special applications, it is desirable that lateral access to certain of the rows of channels does not take place level with the ends of the modules and instead takes place in an area which is relatively remote from said ends.
BRIEF SUMMARY OF THE INVENTION
The invention relates to a process making it possible to manufacture alveolar modules in which certain of the rows of channels issue onto the side-walls of the module, either level with the ends of the latter, or in an area remote from said ends. This process is particularly simple, rapid and easy to perform, because it involves a single stage only which is superimposed on the extrusion stage in conventional production processes. The invention also relates to an apparatus which is particularly well suited for the realisation of this process. ~
According to the invention, this object is achieved by a process for the production of alveolar modules comprising rows of parallel channels9 certain of which issue onto the sidewalls of the module, wherein it consists of producing the module by extrusion using at l~ast two independent systems, each producing rows of identical channels, whereby the formation of one of the systems is interrupted when the rows of channels being pro~uced is to issue onto the sidewalls of the0 module. Preferably, the channels have a square or ~5~S96 rectangular cross-se~tiOn.
According to a first constructional variant of the invention, each system produces by extrusion the lateral and t~ansverse walls of the rows of corresponding channels.
According to a second constructional variant of the invention a first of said systems produces by extrusion the transverse walls of the rows of channels which are to issue onto the sidewalls of the module and the second system produces by extrusion the lateral and transverse walls of the ~her rows of channels.
The invention also relates to an appara-tus for performing this process, ~herein it comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complemen-tary of the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complementary of the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another.
According to another feature of the invention, the second spinneret is displaced relative to the first spinneret in the direction defined by -the parallel channels of the module to be produced.
According to a preferred embodiment of the invention, the extrusion material supply means incor-porate in each case a press plunger which forces the extrusion material through -the corresponding spinnere~
BRIEF DESCRIPTION OF THE DRAWINGS
... .
The invention is described in greater de-tail hereinafter relative to non-limitative embodiments and the attached drawings, wherein show:
Fig 1 a perspective view of an alveolar module produced according to the process of the invention;
Fig 2 a diagrammatic view showing an apparatus permitting the production of the alveolar module of Fig l; and Fig 3 is a diagrammatic view showing a constructional variant of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The alveolar module of Fig 1 is designated by the general reference numeral 10 and comprises rows 12 of parallel channels 14 in which flow a first fluid and rows 16 of parallel channels 18 in which flows a second fluid. The channels14 and 18 are linear and parallel to one another and extend longitudinally in module 10 so as to issue at each of the ends of the latter.
Channels 14 and 18 have a cross-section (as shown in Fig 1) or a rectangular cross-section and the dimensions of the sides of said channels do not exceed 3mm. Consequently, the separation of the fluids circu-lating in channels 14 and 18 level with the ends of module 10 causes problems which are generally solved by displacing the ends of the rows of channels 16 relative to the rows of channels 12 so as to permit the fluid circulating in rows of channels 16 to enter and leave via the sidewalls of module 10, whilst the fluid circulating in rows of channels 12 is introduced and removed by the ends of said module.
According to the invention, the displacements `~3 ~51596 between the ends of the rows of channels 12 and 16 are obtained directly during the manufacture by extrusion of module 10 and no longer by supplementary machining as was hitherto necessary.
As illustrated in Fig 2, this result is obtained by manufacturing the module by extrusion by means of an apparatus incorporating two independent extrusion systems 20 and 22 respectively forming the rows of channels 12 and 16 of the module.
More specifically, each of the systems 20 and 22 comprises independent extrusion material supply means constituted in the present embodiment by two plungers 24 and 26. Each of the plungers 24 and 26 varies the volume of a chamber 28, 30, into each of which the extrusion ~aterial is previously introduced - in ~e form of a spinning bar. The reduction in thè
volume of each of the chambers 28 and 30 caused by the displacement of plunger 24, 26 drives the paste-like extrusion material into passages 38, 40 issuing respectively into two spinnerets 42 and 44.
Spinneret 42 produces by extrusion rows of channels 12 and to this end comprises the same number of separate parts as the module to be produced has rows of channels 12. Each part of the spinneret 42 defines sidewalls 4b and not shown ends defining in cross-section a rectangular shape, whose dimensions correspond to the dimensions of each row of channels, plus the thickness of the walls of said channels.
Spinneret 42 also has masks or covers 48 serving to produce the actual channels 14.
f ~ ~L5~596 spinneret 44 is displaced with respect to spinneret 42 in the direction defined by the parallel channels of the module to be produced. It essen-tially comprises rectangular outer walls 50 extending the outer walls 46 of spinneret 42 corresponding to the outer sidewalls of module 10. Spinneret 44 also has masks or covers 52, whose dimensions correspond to the internal dimensions of channels 18.
According to a first constructional variant of the invention as illustrated in Figure 3, each of the spinnerets 42 and 44 serves both to produce the lateral and transverse walls of the rows of channels 12 and 16 respectively. To this end, the spacing between the lateral walls 46 of two parts of the spinneret 42 for producing two adjacent rows 12 exceedsthe width of masks 52 of the second spinneret 44 by a value corres-ponding to the thickness of each of the lateral walls of the row of channels 16 produced by spinneret 44 between said two rows of adjacent channels 12. This variant has the disadvantage of varying the thickness of the walls separating adjacent channels 14 and 18, depending on whether channels 18 do or do not issue onto the sidewalls of the module.
For this reason and in accordance with a second embodiment of the invention shown in Fig. 2, the width of the mask 52 of the second spinneret 44 is preferably equal to the distance separating the walls 46 of two parts of the spinneret 42 producing two adjacent rows of channels 12. As a result, spinneret 44 only produces the transverse walls of the rows of ~5~596 channels 16, i.e. the walls separating each of the channels 18 of one and the same row. The thickness of the walls sep~ra~ing adjacent channels 14 and lg is then constant within the module 10.
In one or the other of these embodimen-ts, -the thickness of the walls is between 100 ~ and 200 ~.
The alveolar module of Fig 1 is produced by means of the apparatus of Fig 2 in the following manner. Each of the extrusion systems 20 and 22 can be used independently of one another in such a way that the manufacture of the module can be carried out, for example, by using only the plunger of system 20 in order to displace the pasty material in chamber 28 through passages 38 up to the spinneret 42 in such a way as to form rows of channels 12 separated from one another by a distance corresponding to the width of the channels in the represented variant.
The extruded paste reaching the level of spinneret 44 is sufficiently cool to prevent it flowing 2Q or creeping level therewith and the plunger 26 of the second syste;~ 22 can then be put into operation in order to displace through passages 40 the pasty material in chamber 30 towards spinneret 44. This controls the formation of the t~ansverse walls of the channels 18 connecting -the adjacent rows of channels 12 and in this way forming said channels 18. Obviously, if the material extruded by the first spinneret 42 is sufficiently cool on reaching the spinneret 44 to prevent any creep or flow thereof, its temperature is still sufficiently high for the bond or connection between the transverse walls of cha~nels 18 and the rows of channels 12 to be correctly effected.
~ 6 According to the invention, when the rows of channels 16 have to issue onto the sidewalls of module lO, it is merely necessary to interrupt the plunger 26 of extrusion system 22 to ensure that the pasty material in chamber ~0 is no longer moved towards spinneret 44 by passages 40. Thus, only the rows of channels 12 continue to be produced by extrusion by means of system 20. The rows of channels 16 or 12 can then issue onto the sidewalls of the module at any point.
The extrusion material used can be constituted by any conventional extrusion material which complies - with the conditions of use of the manufactured cell.
~referably, this material is constituted by metallic oxide particles, such as alumina, magnesia, titanium dioxide and silica and these are coated, for example~
with organic bin ders and preferably thixotropic binders such as the mixture of seresine and terpinol. Other binders, such as water-based binders, particularly of the tragacanth type for ther~moplastic binders can also be used.
~ he material can also be formed from another substance such as a mixed oxide, a flouride ana in particular an alkaline earth fluoride, or a metal powder.
The constituent is mixed in per se known manner with an appropriate binder, so that the physical characteris-tics of the mixer are well adapted to the extrusion con-ditions.
~bviously, the invention is not limited to the embodiment described hereinbefore and in fact ~51596 numerous variants thereof are possible. Thus, the extrusion appara~us can have the same number of independent systems as there are rows of different parallel channels in the module to be produced and the e~trusion material supply means, together with the spinnerets of each system can be modified and replaced by any known equivalent means.
Moreover, -the rows of channels of different types do not necessarily alternate as in the represented embodiment and the rows of channels which issue at the end of the module by one of their ends can issue onto the walls of the modules by their other ends, provided that the spinneret of each of the extrusion systems produces both the lateral and transverse walls of the corresponding rows of channels according to the first constructional variant described hereinbefore.
_g_
Claims (7)
1. A process for the production of alveolar modules comprising rows of parallel channels, certain of which issue onto the sidewalls of the module, wherein it consists of producing the module by extrusion using at least two systems, each comprising extrusion material supply means and a spinneret, for producing rows of identical channels, the spinnerets being displaced one relative to the other in the direction defined by the parallel channels, and the supply means being controlled independently of one another, whereby the formation of one of the systems is interrupted when the rows of channels being produced is to issue onto the sidewalls of the module.
2. A process according to claim 1, wherein the channels have a square or rectangular cross-section.
3. A process according to claim 2, wherein each system produces by extrusion the lateral and trans-verse walls of the corresponding rows of channels.
4. A process according to claim 2, wherein a first of said systems produces by extrusion the trans-verse walls of the rows of channels which are to issue onto the sidewalls of the module and the second system produces by extrusion the lateral and transverse walls of the other rows of channels.
5. An apparatus for performing the process according to claim 1, wherein it comprises a first extrusion system incorporating first extrusion material supply means and a first spinneret complementary of the cross-section of the rows of channels issuing onto the sidewalls of the module and a second extrusion system incorporating second extrusion material supply means and a second spinneret complementary of the cross-section of the other rows of channels, the first and second supply means being controlled independently of one another and the first and second spinneret being displaced one relative to the other in the direction defined by the parallel channels.
6. An apparatus according to claim 5, wherein the second spinneret is displaced relative to the first spinneret in the direction defined by the parallel channels of the module to be produced.
7. An apparatus according to either of the claims 5 and 6, wherein the extrusion material supply means in each case comprise a plunger press which forces the extrusion material through the corresponding spinneret.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7922310A FR2464817A1 (en) | 1979-09-06 | 1979-09-06 | METHOD AND DEVICE FOR MANUFACTURING ALVEOLAR MODULES |
| FR7922310 | 1979-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1151596A true CA1151596A (en) | 1983-08-09 |
Family
ID=9229412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000359480A Expired CA1151596A (en) | 1979-09-06 | 1980-09-03 | Process and apparatus for production of alveolar modules |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4338273A (en) |
| EP (1) | EP0025743B1 (en) |
| JP (1) | JPS56106813A (en) |
| AU (1) | AU539928B2 (en) |
| CA (1) | CA1151596A (en) |
| DE (1) | DE3067446D1 (en) |
| FR (1) | FR2464817A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2564037B1 (en) * | 1984-05-11 | 1986-10-03 | Inst Francais Du Petrole | ALVEOLAR STRUCTURE FOR COVERING A CURVILINATED SURFACE AND METHOD FOR PRODUCING THE SAME |
| FR2612280B1 (en) * | 1987-03-13 | 1989-06-30 | France Etat Armement | COATING FOR THERMAL PROTECTION OF A STRUCTURE SUBJECT TO CONDITIONS OF INTENSE THERMAL AGGRESSION |
| EP0345219B1 (en) * | 1988-05-31 | 1994-02-02 | Ciba-Geigy Ag | Aqueous dispersions of 2-(2'-hydroxyphenyl) benzotriazoles |
| EP0444172B1 (en) * | 1989-09-20 | 1993-06-16 | GebràDer Sulzer Aktiengesellschaft | Process for producing a body from extrudable compounds, device for implementing the process, extrusion nozzle for such a device and bodies made by the process |
| US5783286A (en) * | 1996-04-04 | 1998-07-21 | Dinicola; James L. | Hollow-core plastic structural lumber alternative |
| US6126833A (en) * | 1999-02-22 | 2000-10-03 | Ceramem Corporation | Cross-flow filtration device with filtrate conduit network and method of making same |
| JP4653387B2 (en) * | 2003-04-21 | 2011-03-16 | 日本碍子株式会社 | Honeycomb structure and exhaust fluid purification system |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1584324A1 (en) * | 1965-04-15 | 1969-12-18 | Schneider & Co | Device for the production of ceramic bodies |
| FR1500843A (en) * | 1966-05-25 | 1967-11-10 | Gen Alimentaire | Machine for coating an elongated body with a perforated or reticulated sheath |
| US3559252A (en) * | 1968-02-06 | 1971-02-02 | Schneider & Co | Extrusion apparatus |
| GB1385907A (en) * | 1971-05-07 | 1975-03-05 | Ici Ltd | Support and catalyst |
| US3825641A (en) * | 1971-06-04 | 1974-07-23 | L Barnett | Method of forming multiple passageway plastic conduit |
| GB1370281A (en) * | 1971-09-02 | 1974-10-16 | Creators Ltd | Flexible plastics hoses |
| US3790654A (en) * | 1971-11-09 | 1974-02-05 | Corning Glass Works | Extrusion method for forming thinwalled honeycomb structures |
| US3861848A (en) * | 1973-03-26 | 1975-01-21 | Joseph L Weingarten | Extrusion apparatus for producing large scale products |
| US3887741A (en) * | 1973-08-13 | 1975-06-03 | Corning Glass Works | Thin-walled honeycombed substrate with axial discontinuities in the periphery |
| US3983283A (en) * | 1974-03-18 | 1976-09-28 | Corning Glass Works | Honeycombed structures having open-ended cells formed by interconnected walls with longitudinally extending discontinuities |
| US4168944A (en) * | 1976-08-24 | 1979-09-25 | Ngk Spark Plug Co., Ltd. | Apparatus for manufacturing a tubular honeycomb assembly with an adiabatic layer formed integrally on the peripheral wall |
-
1979
- 1979-09-06 FR FR7922310A patent/FR2464817A1/en active Granted
-
1980
- 1980-08-26 US US06/181,409 patent/US4338273A/en not_active Expired - Lifetime
- 1980-09-01 AU AU61919/80A patent/AU539928B2/en not_active Withdrawn - After Issue
- 1980-09-02 DE DE8080401254T patent/DE3067446D1/en not_active Expired
- 1980-09-02 EP EP80401254A patent/EP0025743B1/en not_active Expired
- 1980-09-03 CA CA000359480A patent/CA1151596A/en not_active Expired
- 1980-09-04 JP JP12291480A patent/JPS56106813A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU6191980A (en) | 1981-03-12 |
| EP0025743B1 (en) | 1984-04-11 |
| FR2464817A1 (en) | 1981-03-20 |
| AU539928B2 (en) | 1984-10-25 |
| FR2464817B1 (en) | 1982-07-16 |
| US4338273A (en) | 1982-07-06 |
| EP0025743A1 (en) | 1981-03-25 |
| JPS56106813A (en) | 1981-08-25 |
| DE3067446D1 (en) | 1984-05-17 |
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| MKEX | Expiry | ||
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