WO2002020244A1 - Injection moulding method, mould and die - Google Patents
Injection moulding method, mould and die Download PDFInfo
- Publication number
- WO2002020244A1 WO2002020244A1 PCT/FI2001/000756 FI0100756W WO0220244A1 WO 2002020244 A1 WO2002020244 A1 WO 2002020244A1 FI 0100756 W FI0100756 W FI 0100756W WO 0220244 A1 WO0220244 A1 WO 0220244A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- mould
- injection
- moulding material
- moulding
- cross
- Prior art date
Links
- 238000001746 injection moulding Methods 0.000 title claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 104
- 238000000465 moulding Methods 0.000 claims abstract description 63
- 238000002347 injection Methods 0.000 claims abstract description 45
- 239000007924 injection Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims description 19
- 208000015943 Coeliac disease Diseases 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000004033 plastic Substances 0.000 description 18
- 229920003023 plastic Polymers 0.000 description 18
- 229920001169 thermoplastic Polymers 0.000 description 5
- 229920001187 thermosetting polymer Polymers 0.000 description 5
- 239000004416 thermosoftening plastic Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 230000000284 resting effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
- B29C2045/2714—Gates elongated, e.g. film-like, annular
Definitions
- thermoplastic products When thermoplastic products are injection- moulded, the mould is cooled so as to harden the moulding material by lowering its temperature, whereas when thermosetting plastics are concerned, the mould is heated so as to harden the material by raising its temperature.
- thermosetting plastics when thermosetting plastics are concerned, the mould is heated so as to harden the material by raising its temperature.
- the following disclosure refers to the manufacture of thermoplastic products, although it is obvious that the invention may be also applied in the manufacture of thermosetting plastic products.
- Injection moulding is a technique which has conventionally been used for producing relatively massive, i.e. thick-walled, products. Their injection moulding cycle time is long and they require high holding-pressure of long duration to avoid shrinkage during the cooling of the moulding material and to prevent subsequent product deficiencies, such as sink marks or the like.
- An underlying idea of the method of the invention is that the moulding material is supplied from the injection unit to the mould cavity in flow conduits in which the ratio of their cross-sectional area to their outer surface area is arranged such that injected plastic material left in the channels becomes sufficiently hard for removal from the mould earlier than the plastic material that fills the mould cavity or at least substantially simultaneously with it.
- Figure 1d is a sectional view of a runner of the injection mould of Figure 1a;
- the mould 4 comprises a mould cavity 7 that produces the desired three-dimensional shape for the material to be injected.
- the mould 4 comprises a feed system through which the moulding material flows from the injection unit 2 to the mould cavity 7.
- the feed system usually comprises a sprue 8 and a runner 9.
- the sprue 8 usually continues, without a clear transition point, as a runner 9.
- the runner 9 begins at the point where the feed system branches to form conduits ending in separate mould cavities 7.
- Figure 1b shows a cross-sectional view of the injection mould of Figure 1a, seen in the direction of the injection unit 2.
- the Figure shows the cross-section of the sprue 8, which is substantially rectangular.
- the corners of the sprue 8 having a rectangular basic form are rounded to ensure that the flow rate of the moulding material would be relatively uniform in the entire cross-section.
- the sprue 8 is connected through runners 9 to the mould cavities 7, the multi-cavity mould 4 of the Figure including two cavities.
- a mould may also comprise more mould cavities 7 that are, nevertheless, filled rapidly and in a balanced manner.
- the invention may also be applied to a single-cavity mould.
- Figure 3a is a schematic view of another cross-section 20 of a flow conduit of the feed system 8, 9 and the nozzle 3 of the invention.
- the cross-section 20 is substantially elliptic, which is a most preferred shape from the point of view of the moulding material flow and which provides a large cooling surface in proportion to capacity.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001284073A AU2001284073A1 (en) | 2000-09-04 | 2001-08-31 | Injection moulding method, mould and die |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20001941A FI111917B (en) | 2000-09-04 | 2000-09-04 | Injection molding and injection molding nozzle |
FI20001941 | 2000-09-04 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002020244A1 true WO2002020244A1 (en) | 2002-03-14 |
WO2002020244A9 WO2002020244A9 (en) | 2003-01-03 |
Family
ID=8559009
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2001/000756 WO2002020244A1 (en) | 2000-09-04 | 2001-08-31 | Injection moulding method, mould and die |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2001284073A1 (en) |
FI (1) | FI111917B (en) |
WO (1) | WO2002020244A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2882680A1 (en) * | 2005-03-03 | 2006-09-08 | Seropa Technology Sa | Production of an thin object by molding, comprises injecting a thermoplastic material through a slit in a cavity |
EP1916085A1 (en) | 2006-10-26 | 2008-04-30 | Coretronic Corporation | Material-feeding structure for a mold and casing fabrication method using the same structure |
CN101376265B (en) * | 2007-08-29 | 2012-05-30 | 铃木株式会社 | Side gate type injection molding die and molded component manufacturing method using the same |
DE102010017254B4 (en) | 2009-06-25 | 2019-09-12 | Suzuki Motor Corporation | Mold for injection molding |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4451224A (en) * | 1982-03-25 | 1984-05-29 | General Electric Company | Mold device for making plastic articles from resin |
US4687613A (en) * | 1981-10-30 | 1987-08-18 | Shigeru Tsutsumi | Injection molding process for synthetic resin and its apparatus |
JPH0952260A (en) * | 1995-08-14 | 1997-02-25 | Daicel Chem Ind Ltd | Injection mold |
JPH11333898A (en) * | 1998-05-26 | 1999-12-07 | Sony Corp | Mold for injection molding |
-
2000
- 2000-09-04 FI FI20001941A patent/FI111917B/en not_active IP Right Cessation
-
2001
- 2001-08-31 WO PCT/FI2001/000756 patent/WO2002020244A1/en active Application Filing
- 2001-08-31 AU AU2001284073A patent/AU2001284073A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4687613A (en) * | 1981-10-30 | 1987-08-18 | Shigeru Tsutsumi | Injection molding process for synthetic resin and its apparatus |
US4451224A (en) * | 1982-03-25 | 1984-05-29 | General Electric Company | Mold device for making plastic articles from resin |
JPH0952260A (en) * | 1995-08-14 | 1997-02-25 | Daicel Chem Ind Ltd | Injection mold |
JPH11333898A (en) * | 1998-05-26 | 1999-12-07 | Sony Corp | Mold for injection molding |
Non-Patent Citations (2)
Title |
---|
DATABASE WPI Week 199718, Derwent World Patents Index; AN 1997-196697 * |
DATABASE WPI Week 200012, Derwent World Patents Index; AN 2000-129239 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2882680A1 (en) * | 2005-03-03 | 2006-09-08 | Seropa Technology Sa | Production of an thin object by molding, comprises injecting a thermoplastic material through a slit in a cavity |
EP1916085A1 (en) | 2006-10-26 | 2008-04-30 | Coretronic Corporation | Material-feeding structure for a mold and casing fabrication method using the same structure |
CN101376265B (en) * | 2007-08-29 | 2012-05-30 | 铃木株式会社 | Side gate type injection molding die and molded component manufacturing method using the same |
DE102008044722B4 (en) * | 2007-08-29 | 2014-07-24 | Suzuki Motor Corp. | Side-cut injection molding tool for producing a molded component |
DE102010017254B4 (en) | 2009-06-25 | 2019-09-12 | Suzuki Motor Corporation | Mold for injection molding |
Also Published As
Publication number | Publication date |
---|---|
WO2002020244A9 (en) | 2003-01-03 |
FI20001941A0 (en) | 2000-09-04 |
AU2001284073A1 (en) | 2002-03-22 |
FI111917B (en) | 2003-10-15 |
FI20001941A (en) | 2002-03-05 |
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