WO1986007005A1 - Process for moulding polymeric products with strengthening of fibres or filaments - Google Patents
Process for moulding polymeric products with strengthening of fibres or filaments Download PDFInfo
- Publication number
- WO1986007005A1 WO1986007005A1 PCT/BR1986/000008 BR8600008W WO8607005A1 WO 1986007005 A1 WO1986007005 A1 WO 1986007005A1 BR 8600008 W BR8600008 W BR 8600008W WO 8607005 A1 WO8607005 A1 WO 8607005A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fact
- strengthening
- ized
- character
- accordance
- Prior art date
Links
Classifications
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
-
- 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
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/14—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets
- B29C51/145—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor using multilayered preforms or sheets having at least one layer of textile or fibrous material combined with at least one plastics layer
-
- 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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
- B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
Definitions
- the present invention is relative to a process for obtaining polymeric products, strengthened, wholly or partly, with fibres or filaments, either natural, artificial or syn ⁇ thetic, in conventional moulds, utilizing as a moulding ele ⁇ ment, a vacuum and/or a fluid under pressure.
- vullcanization chambers are used in the moulding or mending of tyres.
- the vulcanizing chamber used with water, steam or air pressure, moulds the body of the tyre or of the mend on the mould.
- the vulcanizing is processed for a given time, the pressure is then relaxed and the moulded or mended tyre is withdrawn from the vulcanizing chamber.
- the mould is constituted of two principal parts, male and female, made of the same material, which is generally metal.
- Another method is to place the reinforced polymeric product directly in the mould, without prior modelling or deformation.
- the present invention consists of • a system, in which a flat plastic membrane is used and on this is placed
- the polymeric product wholly or partly strengthened with fibres or filaments.
- the mould is hermetically sealed a and pressure is made on the elastic membrane, with a fluid which compresses the strengthened polymeric product, which then takes on the form of the .mould.
- the strengthened polymeric product is free of tensions and is pressured by the elastic mem ⁇ b ane into taking the form of the mould, its lengthening is spread equally along the whole body, proportionately to the form of the mould. It is thus easy to calculate
- the process consists of a mould (Fig.A), composed of a base 1, a lid 2, the strengthened polymeric product 3,
Abstract
The process consists essentially of a way to mould polymeric products, with total or partial strengthening, by making pressure by means of an elastic membrane on the walls of the mould, giving at the same time, form to the polymeric product and subjecting the strengthening to a defined and permanent residual lengthening.
Description
' Descriptive Report of the Invention Patent for a "PROCESS FOR MOULDING POLYMERIC PRODUCTS WITH STRENGTHENING OF FIBRES OR FILAMENTS".
The present invention is relative to a process for obtaining polymeric products, strengthened, wholly or partly, with fibres or filaments, either natural, artificial or syn¬ thetic, in conventional moulds, utilizing as a moulding ele¬ ment, a vacuum and/or a fluid under pressure.
It is already public knowledge that vullcanization chambers are used in the moulding or mending of tyres. The vulcanizing chamber, used with water, steam or air pressure, moulds the body of the tyre or of the mend on the mould. The vulcanizing is processed for a given time, the pressure is then relaxed and the moulded or mended tyre is withdrawn from the vulcanizing chamber.
Subsequently, other processes were developped, using expanding chambers for the moulding of cylindrical parts, pre¬ pared with strengthened thermoplastic, as is the case with A e rican patent 3:937.781, in which the plastic cylinder, streng- thened with fibres is pressed against the walls of the mould by a rubber bag and is later cooled, taking on the form defined by the mould. In this case, the pressure serves merely to squeeze the part mounted on a chuck, while the thermoplastic cools and takes on the desired form. Another process, described in Brazilian request ....
PI-8008367 a "PROCESS FOR MOULDING REINFORCED RESIN PRODUCTS
2 .
AND THE APPARATUS FOR CARRYING OUT THE PROCESS", where the textile reinforcement is impregnated with a liquid resin which is injected under pressure and an elastic bag presses it against the walls of the mould. All the processes mentioned, merely press the pro¬ duct on to the walls of the mould.
There are presently in the industry, two methods for the manufacture of polymeric products which are rein¬ forced wholly or partly with fibres or filaments. One of the methods most used, is that in which the deformation is made beforehand, namely, the reinforce¬ ment is moulded, with or without lengthening, and is sub¬ sequently covered with the polymeric product, and is then placed in the mould to take on the desired form. Normally, the mould is constituted of two principal parts, male and female, made of the same material, which is generally metal.
Another method is to place the reinforced polymeric product directly in the mould, without prior modelling or deformation.
Both methods, in addition to not allowing the per¬ manence of a constant residual lengtheningς*, run the risk of spoiling th final product, in the case of very thin products, owing to the contact of the male and female parts of the mould, cutting the strengthening material. It some times happens tha the loss of the material in addition to
spoiling the strengthened polymeric material, emI by spoiling the mould.
The present invention, consists of • a system, in which a flat plastic membrane is used and on this is placed
05 the polymeric product, wholly or partly strengthened with fibres or filaments. The mould is hermetically sealed a and pressure is made on the elastic membrane, with a fluid which compresses the strengthened polymeric product, which then takes on the form of the .mould.
10 As is known, any strengthening must maintain a re¬ sidual lengthening, related directly to the work it has to do.This residual lengthening is what maintains the pro¬ duct always at the same size, within the pressures it has to bear.
15 As described, if the strengthened polymeric product is free of tensions and is pressured by the elastic mem¬ b ane into taking the form of the mould, its lengthening is spread equally along the whole body, proportionately to the form of the mould. It is thus easy to calculate
20 the residual lengthening at which the strengthening should be maintained, without creating a tension for the poly¬ meric product.
The process consists of a mould (Fig.A), composed of a base 1, a lid 2, the strengthened polymeric product 3,
25 the elastic membrane 4, and two apertures, the one on the base 6, and the one on the lid 5.
Placing the strengthened polymer 3, on the elastic
membrane 4, and this in turn on base 1, the lid 2, closes the mould hermetically. Maintaining the base 1 and the lid 2, pressed against each other, for example, between the faces of a press, either by screws or by excentrics, or by weights etc., a fluid is injected under pressure through tube 6, and at the same time, air is expelled through tube 5, putting pressure on the elastic membrane 4, which in turn puts pressure on the strengthened polymeric product 3, against the walls of the lid 2, thus pressing into the form of the mould, either by heat or by cooling. The strengthening which had a residual lengthening , when flat, of X%, now with the lengthening caused by the pressure of the fluid against the walls of the mould, has been reduced to X/Y%. Thus, as the relationship of de¬ formation, between the plane area and the deformed area part of the residual lengthening in the processing is with- drawn, which was previously done in the strengthening. Example 1.
It is desired to maintain a residual lengthening of 5% in a strengthening, the original lengthening of which was 12%. The relation between the plane area and the de¬ formed area is 5%. Thus, a pre-treatment lengthening of 2% is made, and the strengthening changes from 12% to 10%. Example 2. It is desired to maintain a residual lengthening of 3% in a strengthening, the initial lengthening of which is 15%. The relation between the plane area and the deformed area is 2%. Thus, a pre-treatment lengthening of 10% is made, and the strengthening changes from 15% to 5%.
Claims
C L A I M S
1 - A process to mould polymeric products, with fib. e or filament strengthening, where the strengthened polymeric product is pressured by an elastic membrane on to the walls of the mould, by the pressure exerted by a fluid injected under pressure, or by a vacuum, characterized by the fact that at the same time during which the polymeric product takes on the form of the mould, it it subjects the strengthening to a defined and permanent residual leng¬ thening . 2 - a process in accordance with claim 1, character¬ ized by the fact that the polymeric product, may be a plastic, a resin, an elastomere or a mixture of these among themselves or with other raw materials.
3 - A process in accordance with claim 1, character- ized by the fact that the strengthening may be of natural,
.irtificial or synthetic fibres or filaments, either woven or not.
4 - A process in accordance with claim 1, character¬ ized by the fact that the moulding may be made either with cooling or heating.
5 - A process in accordance with claim 1, character¬ ized by the fact that the elastic membrane may be smooth, have a design on it or be grooved.
6 - A process in accordance with claim 1, character- ized by the fact that the moulding may be exercised by a cold or hot fluid.
7 - A process in accordance with claim 1, character¬ ized by the fact that the moulding may be exercised by a vacuum.
8 - A process in accordance with claim 1, character¬ ized by the fact that the moulding of the polymeric pro- duct can be made by the pressure of the elastic membrane or directly, without the help of the same.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR8502414A BR8502414A (en) | 1985-05-21 | 1985-05-21 | PROCESS FOR MOLDING POLYMERIC PRODUCTS WITH FIBER OR FILAMENT REINFORCEMENT |
BR8502414 | 1985-05-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1986007005A1 true WO1986007005A1 (en) | 1986-12-04 |
Family
ID=4037913
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR1986/000008 WO1986007005A1 (en) | 1985-05-21 | 1986-05-21 | Process for moulding polymeric products with strengthening of fibres or filaments |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0221964A1 (en) |
BR (1) | BR8502414A (en) |
WO (1) | WO1986007005A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0348367A1 (en) * | 1988-06-23 | 1989-12-27 | Telefonaktiebolaget L M Ericsson | Moulding tool |
GB2195945B (en) * | 1986-08-29 | 1990-01-24 | Tarlton Kelly Underwater World | Improvements in shaping |
US5037599A (en) * | 1989-06-26 | 1991-08-06 | Basf Aktiengesellschaft | Single diaphragm forming of drapeable thermoplastic impregnated composite materials |
US5407610A (en) * | 1990-02-06 | 1995-04-18 | Honda Giken Kogyo Kabushiki Kaisha | Method for molding fiber-reinforced resin |
EP0714752A2 (en) * | 1994-12-02 | 1996-06-05 | Miguel Alives Porta | A process and arrangement for three dimensional forming of a fabric |
FR2915128A1 (en) * | 2007-04-23 | 2008-10-24 | Cie Euro Etude Rech Paroscopie | METHOD FOR FORMING ELASTOMER OR PLASTIC SOFT SHEET AND CORRESPONDING DEVICE |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2329425A (en) * | 1943-01-29 | 1943-09-14 | Columbian Rope Co | Molding apparatus |
US3446686A (en) * | 1964-07-29 | 1969-05-27 | Gen Tire & Rubber Co | Method in laminating reinforced sheet |
US3614811A (en) * | 1969-08-13 | 1971-10-26 | Shell Oil Co | Diaphragm-type form-shaping apparatus |
US3744262A (en) * | 1971-06-30 | 1973-07-10 | R Bose | Method for cooling thermoformed plastic parts |
US4087224A (en) * | 1975-09-24 | 1978-05-02 | The Upjohn Company | Integral skin cushion molding apparatus |
US4230764A (en) * | 1979-04-30 | 1980-10-28 | The United States Of America As Represented By The Secretary Of The Army | Prestressed article |
-
1985
- 1985-05-21 BR BR8502414A patent/BR8502414A/en unknown
-
1986
- 1986-05-21 EP EP19860903173 patent/EP0221964A1/en not_active Withdrawn
- 1986-05-21 WO PCT/BR1986/000008 patent/WO1986007005A1/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2329425A (en) * | 1943-01-29 | 1943-09-14 | Columbian Rope Co | Molding apparatus |
US3446686A (en) * | 1964-07-29 | 1969-05-27 | Gen Tire & Rubber Co | Method in laminating reinforced sheet |
US3614811A (en) * | 1969-08-13 | 1971-10-26 | Shell Oil Co | Diaphragm-type form-shaping apparatus |
US3744262A (en) * | 1971-06-30 | 1973-07-10 | R Bose | Method for cooling thermoformed plastic parts |
US4087224A (en) * | 1975-09-24 | 1978-05-02 | The Upjohn Company | Integral skin cushion molding apparatus |
US4230764A (en) * | 1979-04-30 | 1980-10-28 | The United States Of America As Represented By The Secretary Of The Army | Prestressed article |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2195945B (en) * | 1986-08-29 | 1990-01-24 | Tarlton Kelly Underwater World | Improvements in shaping |
US5084226A (en) * | 1986-08-29 | 1992-01-28 | Tarlton Aquastar Limited Partnership | Method of shaping sheets using gravity |
EP0348367A1 (en) * | 1988-06-23 | 1989-12-27 | Telefonaktiebolaget L M Ericsson | Moulding tool |
US4968237A (en) * | 1988-06-23 | 1990-11-06 | Telefonaktiebolaget L M Ericsson | Moulding tool |
US5037599A (en) * | 1989-06-26 | 1991-08-06 | Basf Aktiengesellschaft | Single diaphragm forming of drapeable thermoplastic impregnated composite materials |
US5407610A (en) * | 1990-02-06 | 1995-04-18 | Honda Giken Kogyo Kabushiki Kaisha | Method for molding fiber-reinforced resin |
EP0714752A2 (en) * | 1994-12-02 | 1996-06-05 | Miguel Alives Porta | A process and arrangement for three dimensional forming of a fabric |
EP0714752A3 (en) * | 1994-12-02 | 1997-10-08 | Porta Miguel Alives | A process and arrangement for three dimensional forming of a fabric |
US5783137A (en) * | 1994-12-02 | 1998-07-21 | Alives Porta; Miguel | Process for three dimensional forming of a fabric |
FR2915128A1 (en) * | 2007-04-23 | 2008-10-24 | Cie Euro Etude Rech Paroscopie | METHOD FOR FORMING ELASTOMER OR PLASTIC SOFT SHEET AND CORRESPONDING DEVICE |
WO2008145858A2 (en) * | 2007-04-23 | 2008-12-04 | Compagnie Européenne D'etude Et De Recherche De Dispositifs Pour L'implantation Par Laparoscopie | Shaping method and corresponding device |
WO2008145858A3 (en) * | 2007-04-23 | 2009-02-26 | Cie Euro Etude Rech Paroscopie | Shaping method and corresponding device |
Also Published As
Publication number | Publication date |
---|---|
BR8502414A (en) | 1986-12-30 |
EP0221964A1 (en) | 1987-05-20 |
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