CA2295122A1 - Injection moulding of large plastic components - Google Patents
Injection moulding of large plastic components Download PDFInfo
- Publication number
- CA2295122A1 CA2295122A1 CA002295122A CA2295122A CA2295122A1 CA 2295122 A1 CA2295122 A1 CA 2295122A1 CA 002295122 A CA002295122 A CA 002295122A CA 2295122 A CA2295122 A CA 2295122A CA 2295122 A1 CA2295122 A1 CA 2295122A1
- Authority
- CA
- Canada
- Prior art keywords
- mould
- valve
- accumulator
- injection
- extruder
- 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.)
- Abandoned
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 43
- 229920003023 plastic Polymers 0.000 title claims abstract description 43
- 238000001746 injection moulding Methods 0.000 title claims abstract description 19
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 239000004575 stone Substances 0.000 claims abstract description 6
- 239000013618 particulate matter Substances 0.000 claims abstract 2
- 239000000463 material Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 208000015943 Coeliac disease Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002699 waste material Substances 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
- B29C45/28—Closure devices therefor
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
-
- 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
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C2045/538—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston the plunger being part of the mould cavity wall after injection
-
- 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
- B29K2105/26—Scrap or recycled material
-
- 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
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/911—Recycling consumer used articles or products
- Y10S264/921—Recycling consumer used articles or products by injection molding material recycled from consumer used article or product
Abstract
A system for injection moulding of large plastics components in a single shot comprises an extruder and an accumulator fed from the extruder. The accumulator leads into the mould (14) via a mould valve (12) operative, when closed, to close the mould cavity substantially at the mould surface and also to close an outlet (20a) from the accumulator. The valve passage of the mould valve is of relatively large cross section, typically several centimetres or more which facilitates injection at relatively low pressures and also facilitates passage of stones and other particulate matter which may be present if the extrudate is composed of post-consumer recycled plastics.
Description
INJECTION MOULDING OF LARGE PLASTIC COMPONENTS
The present invention relates to the manufacture of moulded plastics products and more particularly to the manufacture of plastics products of substantial size and weight. More specifically, but not exclusively, the invention relates to the manufacture of plastics products from post-consumer recycled plastics waste.
Conventional plastics injection moulding techniques traditionally involve the use of high injection pressures. The mould must be capable of withstanding the injection pressures involved and as a result when articles of relatively large size are being produced the cost of the injection equipment and mould is very substantial.
Traditional injection moulding equipment which relies on the use of relatively narrow runners leading into the mould requires the use of virgin plastic or recycled plastic that is I S substantially free of foreign matter likely to interfere with the injection process. Post-consumer recycled plastic is likely to contain particles of metal glass or stone which for most traditional injection moulding methods must be removed prior to re-use of the recycled plastics. The processing required to ensure that the recycled plastics is substantially free of foreign matter further adds to the cost of processing which may make the cost of using recycled plastics not commercially worthwhile.
The present invention seeks to provide a method and apparatus for relatively low pressure injection moulding of large plastics articles in one shot possibly using post-consumer recycled plastics which may still contain particles of foreign matter.
According to the present invention, there is provided a method of injection moulding a plastics article under relatively low injection pressures, comprising feeding plastics material from an extruder into an accumulator, and displacing the extrudate from the accumulator into a mould via a valve leading into the mould cavity, the valve having a valve piston which at the end of injection closes the mould cavity substantially at the mould surface.
The present invention relates to the manufacture of moulded plastics products and more particularly to the manufacture of plastics products of substantial size and weight. More specifically, but not exclusively, the invention relates to the manufacture of plastics products from post-consumer recycled plastics waste.
Conventional plastics injection moulding techniques traditionally involve the use of high injection pressures. The mould must be capable of withstanding the injection pressures involved and as a result when articles of relatively large size are being produced the cost of the injection equipment and mould is very substantial.
Traditional injection moulding equipment which relies on the use of relatively narrow runners leading into the mould requires the use of virgin plastic or recycled plastic that is I S substantially free of foreign matter likely to interfere with the injection process. Post-consumer recycled plastic is likely to contain particles of metal glass or stone which for most traditional injection moulding methods must be removed prior to re-use of the recycled plastics. The processing required to ensure that the recycled plastics is substantially free of foreign matter further adds to the cost of processing which may make the cost of using recycled plastics not commercially worthwhile.
The present invention seeks to provide a method and apparatus for relatively low pressure injection moulding of large plastics articles in one shot possibly using post-consumer recycled plastics which may still contain particles of foreign matter.
According to the present invention, there is provided a method of injection moulding a plastics article under relatively low injection pressures, comprising feeding plastics material from an extruder into an accumulator, and displacing the extrudate from the accumulator into a mould via a valve leading into the mould cavity, the valve having a valve piston which at the end of injection closes the mould cavity substantially at the mould surface.
In a preferred embodiment of the invention, during injection of extrudate from the accumulator into the mould cavity the extruder continues in operation to provide further extrudate for use in the same injection cycle.
The extruder may be fed with plastics material composed at least partially of post-consumer recycled plastics, the valve passage being of a size such that it will not be blocked by stones or other particulate foreign matter which might be present within the material. The relatively large cross-sectional area of the valve passage also provides relatively low pressure, but high volumetric flow, of injection into the mould cavity. Advantageously, filling of the mould with the required amount of plastics material is determined by sensing of pressure within the mould cavity.
According to another aspect of the invention, there is provided an injection moulding system for single shot injection moulding of large plastics components, comprising an extruder, and an accumulator fed from the extruder, the accumulator leading into the mould via a mould valve operative when closed to close the mould cavity substantially at the mould surface and also to close an outlet from the accumulator.
In a preferred embodiment of the invention, the accumulator comprises an accumulator cylinder having a piston operative to inject extrudate into the mould, and the mould valve comprises a valve member in the form of a piston within a tubular valve passage terminating in an injection nozzle lying within the mould cavity, the valve piston having an end face which, in the closed condition of the valve, lies substantially at the outlet end of the injection nozzle and seats within the nozzle. Advantageously, an outlet from the accumulator branches into the valve passage, and, in the closed condition of the mould valve, a side wall of the piston closes the outlet at the position at which it branches into the valve passage.
Still further according to the invention, there is provided a system for injection moulding relatively large plastics articles, comprising an extruder, an accumulator coupled to an outlet from the exwder, the accumulator leading into a mould via a mould valve having -3- _ a passage of relatively large cross-sectional size whereby to effect injection at relatively low injection pressures, and means for sensing a mould-full condition to effect closure of the mould valve by sensing the pressure of injected material at one or more positions within the mould cavity.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 shows schematically an injection moulding system in accordance with a preferred embodiment of the invention for one shot injection moulding of large plastics articles; and Figure 2 shows schematically and to an enlarged scale a mould valve within the system of Figure 1 and illustrating the relationship between the mould valve and the mould cavity in a closed condition of the valve.
The system shown in the accompanying drawings comprises an extruder 2 fed with raw plastics material via a suitable inlet device 4 which delivers a specific volume of raw material to the extruder 2 in order to keep the extruder loaded with plastics material at all times during operation of the extruder. The incoming plastics material may consist of post-consumer recycled plastics material shredded and comminuted in size and possibly mixed with recycled raw plastics material according to requirements. The extrudate from the extruder 2 passes via a heated transfer pipe 6 to an accumulator 8 which is preferably of hydraulic type; the transfer pipe 6 includes a pressure relief valve 10 loaded by an air cylinder. The accumulator 8 in its preferred form consists of a large capacity cylinder with a hydraulically-powered piston. Between injection shots, the cylinder is filled with extrudate from the - 25 extruder 2 and when the accumulator cylinder is filled the accumulator piston is actuated to inject extrudate via a mould valve 12 into the mould cavity 14. During this process the extruder 2 continues to operate whereby the mould cavity 14 is filled with extrudate previously stored in the accumulator 8 and also continually fed from the extruder 2 via the accumulator 8 during injection.
The extruder may be fed with plastics material composed at least partially of post-consumer recycled plastics, the valve passage being of a size such that it will not be blocked by stones or other particulate foreign matter which might be present within the material. The relatively large cross-sectional area of the valve passage also provides relatively low pressure, but high volumetric flow, of injection into the mould cavity. Advantageously, filling of the mould with the required amount of plastics material is determined by sensing of pressure within the mould cavity.
According to another aspect of the invention, there is provided an injection moulding system for single shot injection moulding of large plastics components, comprising an extruder, and an accumulator fed from the extruder, the accumulator leading into the mould via a mould valve operative when closed to close the mould cavity substantially at the mould surface and also to close an outlet from the accumulator.
In a preferred embodiment of the invention, the accumulator comprises an accumulator cylinder having a piston operative to inject extrudate into the mould, and the mould valve comprises a valve member in the form of a piston within a tubular valve passage terminating in an injection nozzle lying within the mould cavity, the valve piston having an end face which, in the closed condition of the valve, lies substantially at the outlet end of the injection nozzle and seats within the nozzle. Advantageously, an outlet from the accumulator branches into the valve passage, and, in the closed condition of the mould valve, a side wall of the piston closes the outlet at the position at which it branches into the valve passage.
Still further according to the invention, there is provided a system for injection moulding relatively large plastics articles, comprising an extruder, an accumulator coupled to an outlet from the exwder, the accumulator leading into a mould via a mould valve having -3- _ a passage of relatively large cross-sectional size whereby to effect injection at relatively low injection pressures, and means for sensing a mould-full condition to effect closure of the mould valve by sensing the pressure of injected material at one or more positions within the mould cavity.
An embodiment of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:-Figure 1 shows schematically an injection moulding system in accordance with a preferred embodiment of the invention for one shot injection moulding of large plastics articles; and Figure 2 shows schematically and to an enlarged scale a mould valve within the system of Figure 1 and illustrating the relationship between the mould valve and the mould cavity in a closed condition of the valve.
The system shown in the accompanying drawings comprises an extruder 2 fed with raw plastics material via a suitable inlet device 4 which delivers a specific volume of raw material to the extruder 2 in order to keep the extruder loaded with plastics material at all times during operation of the extruder. The incoming plastics material may consist of post-consumer recycled plastics material shredded and comminuted in size and possibly mixed with recycled raw plastics material according to requirements. The extrudate from the extruder 2 passes via a heated transfer pipe 6 to an accumulator 8 which is preferably of hydraulic type; the transfer pipe 6 includes a pressure relief valve 10 loaded by an air cylinder. The accumulator 8 in its preferred form consists of a large capacity cylinder with a hydraulically-powered piston. Between injection shots, the cylinder is filled with extrudate from the - 25 extruder 2 and when the accumulator cylinder is filled the accumulator piston is actuated to inject extrudate via a mould valve 12 into the mould cavity 14. During this process the extruder 2 continues to operate whereby the mould cavity 14 is filled with extrudate previously stored in the accumulator 8 and also continually fed from the extruder 2 via the accumulator 8 during injection.
As shown in Figure 2, the mould valve 12 comprises a tube 16 defining a valve passage in which is mounted a hydraulically-actuated piston 18. The tube 16 extends through the wall 14a of the mould into the mould cavity 14. A feed line 20 from the accumulator 8 branches into the tube 16 of the mould valve 12. In the open condition of the mould valve S 12, the valve piston 18 is retracted to a position upstream of the branch inlet 20a from the feed line 20 to enable free passage of the extrudate into the mould cavity 14 via the tube 16 and via a heated nozzle 22 at the outlet end of the tube 16. In the closed condition of the mould valve 12 (as shown in Figure 2) the piston 18 not only closes the branch inlet 20a from the accumulator feed line 20, but also extends via tube 16 into the mould cavity 14, the end of the valve piston 18 seating within the nozzle 22, whereby the nozzle 22 defines the seat for the valve piston 18 in its closed condition so that the end of the piston 8 shuts off the mould cavity substantially at the mould surface; i.e. the surface of the article being moulded. As a result, the moulding is not formed with any sprues which require post-forming finishing operations.
The tube 16 defining the valve passage and the injection nozzle 22 through which extrudate is injected into the mould are of relatively large diameter, typically of several centimetres or more up to about 10 centimetres diameter depending on the size of the mould, and are such that stones or similarly large particles of foreign matter possibly up to a size of 2-3 centimetres which might remain after shredding and comminution of incoming post-consumer plastics material, will not interfere with the injection process. The large cross-section of the injection system also facilitates a high volumetric flow rate at lower injection pressures than is conventional.
The system is particularly suitable for one shot moulding of plastics components of many tens of kilograms in weight, for example components of up to about 130 kilograms in weight. By way of illustrative example only, the system can be used for one shot moulding of load-carrying pallets. A typical injection pressure using the system of the preferred embodiment will be of the order of 400 pounds per square inch which is many times less than that used in conventional injection moulding processes.
The tube 16 defining the valve passage and the injection nozzle 22 through which extrudate is injected into the mould are of relatively large diameter, typically of several centimetres or more up to about 10 centimetres diameter depending on the size of the mould, and are such that stones or similarly large particles of foreign matter possibly up to a size of 2-3 centimetres which might remain after shredding and comminution of incoming post-consumer plastics material, will not interfere with the injection process. The large cross-section of the injection system also facilitates a high volumetric flow rate at lower injection pressures than is conventional.
The system is particularly suitable for one shot moulding of plastics components of many tens of kilograms in weight, for example components of up to about 130 kilograms in weight. By way of illustrative example only, the system can be used for one shot moulding of load-carrying pallets. A typical injection pressure using the system of the preferred embodiment will be of the order of 400 pounds per square inch which is many times less than that used in conventional injection moulding processes.
Conventional injection moulding processes which operate using high injection pressures usually inject into the mould on a time basis or volumetric basis.
Although either basis is likely to provide consistent results when operating at high injection pressures, it is unlikely to do so at the much lower injection pressures which take place using the system of the preferred embodiment of the present invention, particularly when using post-consumer recycled plastics as the extrudate itself will not always be consistent and may also be subject to some internal gassing arising from foreign matter within the mix. To overcome this difficulty, one or more pressure sensors are incorporated at appropriate positions within the mould to sense build-up of internal pressure within the mould during injection. Complete filling of the mould will be determined by sensing of the required internal pressure within the mould cavity by the or each pressure sensor within the mould and at that point the mould valve 12 will be closed with the piston 18 of the valve closing directly onto the mould surface as previously discussed; injection from the accumulator 8 will also cease and the accumulator piston will be retracted to permit re-charging of the accumulator with extrodate in preparation for the next mould cycle. The number of pressure sensors within the mould and the positioning of the pressure sensors will be dependent on the volume of the mould and also the complexity of the mould shape.
As the system is operating at comparatively low injection pressures, the overall mould structure can be built to a lesser strength than that which would be needed if substantially higher injection pressures were being used and this, in turn, will lead to a significantly reduced mould cost. The relatively large volumetric injection flow rate at reduced pressures also results in absence of high back pressure onto the extruder whereby the extruder can operate at substantially constant speed throughout its cycle and without undergoing substantial stress variations throughout its cycle thus resulting in increased working life for the extruder.
It is to be understood that although the system described is particularly suitable for use with plastics composed at least partially of post-consumer recycled plastics it can also be used with raw plastics material.
Although either basis is likely to provide consistent results when operating at high injection pressures, it is unlikely to do so at the much lower injection pressures which take place using the system of the preferred embodiment of the present invention, particularly when using post-consumer recycled plastics as the extrudate itself will not always be consistent and may also be subject to some internal gassing arising from foreign matter within the mix. To overcome this difficulty, one or more pressure sensors are incorporated at appropriate positions within the mould to sense build-up of internal pressure within the mould during injection. Complete filling of the mould will be determined by sensing of the required internal pressure within the mould cavity by the or each pressure sensor within the mould and at that point the mould valve 12 will be closed with the piston 18 of the valve closing directly onto the mould surface as previously discussed; injection from the accumulator 8 will also cease and the accumulator piston will be retracted to permit re-charging of the accumulator with extrodate in preparation for the next mould cycle. The number of pressure sensors within the mould and the positioning of the pressure sensors will be dependent on the volume of the mould and also the complexity of the mould shape.
As the system is operating at comparatively low injection pressures, the overall mould structure can be built to a lesser strength than that which would be needed if substantially higher injection pressures were being used and this, in turn, will lead to a significantly reduced mould cost. The relatively large volumetric injection flow rate at reduced pressures also results in absence of high back pressure onto the extruder whereby the extruder can operate at substantially constant speed throughout its cycle and without undergoing substantial stress variations throughout its cycle thus resulting in increased working life for the extruder.
It is to be understood that although the system described is particularly suitable for use with plastics composed at least partially of post-consumer recycled plastics it can also be used with raw plastics material.
Throughout this specification and claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers or steps but not the exclusion of any other integer or group of integers.
The embodiment has been described by way of example only and modifications are possible within the scope of the invention.
The embodiment has been described by way of example only and modifications are possible within the scope of the invention.
Claims (14)
1. A method of injection moulding a plastics article under relatively low injection pressures, comprising feeding plastics material from an extruder into an accumulator, and displacing the extrudate from the accumulator into a mould via a valve leading into the mould cavity, the valve having a valve piston which at the end of injection closes the mould cavity substantially at the mould surface.
2. A method according to claim 1, wherein during injection of extrudate from the accumulator into the mould cavity the extruder continues in operation to provide further extrudate for use in the same injection cycle.
3. A method according to claim 1 or claim 2, wherein the extruder is fed with plastics material composed at least partially of post-consumer recycled plastics, the valve passage being of a size such that it will not be blocked by stones or other particulate foreign matter which might be present within the material.
4. A method according to any one of the preceding claims, wherein filling of the mould with the required amount of plastics material is determined by sensing of pressure within the mould cavity.
5. A method according to any one of the preceding claims, wherein the injection pressure is of the order of several hundreds of pounds per square inch.
6. A method according to any one of the preceding claims, wherein the valve piston also closes an outlet of the accumulator at the end of injection.
7. An injection moulding system for single shot injection moulding of large plastics components, comprising an extruder, and an accumulator fed from the extruder, the accumulator leading into the mould via a mould valve operative, when closed, to close the mould cavity substantially at the mould surface and also to close an outlet from the accumulator.
8. A system according to claim 7, wherein the accumulator comprises an accumulator cylinder having a piston operative to inject extrudate into the mould, and the mould valve comprises a valve member in the form of a piston within a tubular valve passage terminating in an injection nozzle lying within the mould cavity, the valve piston having an end face which, in the closed condition of the valve, lies substantially at the outlet end of the injection nozzle and seats within the nozzle.
9. A system according to claim 8, wherein the outlet from the accumulator branches into the valve passage, and, in the closed condition of the mould valve, a side wall of the valve piston closes the accumulator outlet at the position at which it branches into the valve passage.
10. A system according to any one of claims 7 to 9, wherein the valve passage and accumulator outlet are of a size such that they will not be blocked by stones or other particulate matter which may be present in the extrudate when at least partially composed of post-consumer recycled plastics.
11. A system according to any one of claims 7 to 10, comprising means for sensing a mould-full condition to effect closure of the mould valve by sensing the pressure of injected material at one or more positions within the mould cavity.
12. A system for injection moulding relatively large plastics articles, comprising an extruder, an accumulator coupled to an outlet from the extruder, the accumulator leading into a mould via a mould valve having a passage of relatively large cross-sectional size whereby to effect injection at relatively low injection pressures, and means for sensing a mould-full condition to effect closure of the mould valve by sensing the pressure of injected material at one or more positions within the mould cavity.
13. A system according to claim 12, wherein the injection pressure is of the order of several hundreds of pounds per square inch.
14. A system according to claim 12 or claim 13, wherein the passage has a diameter of at least several centimetres.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPO7522 | 1997-06-26 | ||
| AUPO7522A AUPO752297A0 (en) | 1997-06-26 | 1997-06-26 | Manufacturing process and apparatus |
| PCT/AU1998/000370 WO1999000237A1 (en) | 1997-06-26 | 1998-05-20 | Injection moulding of large plastic components |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2295122A1 true CA2295122A1 (en) | 1999-01-07 |
Family
ID=3801812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002295122A Abandoned CA2295122A1 (en) | 1997-06-26 | 1998-05-20 | Injection moulding of large plastic components |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6464910B1 (en) |
| EP (1) | EP0991515A4 (en) |
| JP (1) | JP2002506396A (en) |
| AU (1) | AUPO752297A0 (en) |
| CA (1) | CA2295122A1 (en) |
| IL (1) | IL133487A (en) |
| NZ (1) | NZ501643A (en) |
| WO (1) | WO1999000237A1 (en) |
| ZA (1) | ZA984974B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7024512B1 (en) | 1998-02-10 | 2006-04-04 | International Business Machines Corporation | Compression store free-space management |
| DE19948278A1 (en) | 1999-10-06 | 2001-04-19 | Battenfeld Gmbh | Method and device for multi-component injection molding of plastic molded parts |
| KR100767030B1 (en) * | 2000-02-14 | 2007-10-15 | 로몰드 코포레이션 엔브이 | Moulding of mouldable materials |
| US7022765B2 (en) * | 2004-01-09 | 2006-04-04 | General Electric | Method for the preparation of a poly(arylene ether)-polyolefin composition, and composition prepared thereby |
| US20070090571A1 (en) * | 2005-10-26 | 2007-04-26 | Lomold Corporation Nv | Moulding method and apparatus |
| US20090096136A1 (en) * | 2007-10-12 | 2009-04-16 | The Regents Of The University Of California | Thiol-ene based poly(alkylsiloxane) materials |
| JP5189682B2 (en) * | 2009-12-25 | 2013-04-24 | ハイチアン プラスティクス マシーナリー グループ カンパニー リミテッド | Injection molding method and injection molding equipment for composite material whose main component is stone material |
| TWI394648B (en) * | 2010-07-20 | 2013-05-01 | Haitian plastics machinery group co ltd | Injection molding method of stone-based composite material and injection molding equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2382655A (en) * | 1943-02-16 | 1945-08-14 | Allied Plastics Co | Auxiliary scrap feed for plastic molding machines |
| DE1729252A1 (en) * | 1967-09-01 | 1971-06-09 | Fahr Bucher Gmbh | Method and device for the shaping processing of hardenable plastics |
| US3819313A (en) * | 1970-04-02 | 1974-06-25 | Allied Chem | Apparatus for molding articles |
| DE2031657A1 (en) * | 1970-06-26 | 1971-12-30 | Krauss Maffei Ag | Method and device for operating an injection molding machine |
| US3941529A (en) * | 1970-06-01 | 1976-03-02 | Union Carbide Corporation | Apparatus for forming thermoplastic articles |
| CH538928A (en) * | 1971-06-14 | 1973-07-15 | Hanning Robert | Method for producing objects, in particular large-area objects, by injection molding a mixture of plasticized plastic and a blowing agent and an injection molding machine suitable for this |
| FR2225271A1 (en) * | 1973-04-11 | 1974-11-08 | Ducruez Raymond | Injection moulding nozzle with integral ejection ram - esp. used for deep mouldings of expanded polystyrene |
| NL7512948A (en) * | 1975-11-05 | 1977-05-09 | Herstal Sa | DEVICE FOR THE MANUFACTURE OF HOLLOW PLASTIC BODIES, AND HOLLOW BODIES MADE WITH THIS DEVICE. |
| JPS5565532A (en) | 1978-11-10 | 1980-05-17 | Toyota Central Res & Dev Lab Inc | Cavity pressure controller for injection molding machine |
| US4784819A (en) | 1982-03-19 | 1988-11-15 | Fedders Machine & Tool Co., Inc. | Method of injection molding of plastic parts utilizing an accumlator chamber and valve chamber between the plasticizer and mold |
| GB2124968B (en) * | 1982-08-06 | 1985-11-13 | Mouldmaking Design Centre Limi | Removing sprues from mouldings |
| US4473516A (en) | 1983-01-03 | 1984-09-25 | Hoover Universal, Inc. | Method and apparatus for injection molding plastic articles having solid exterior surfaces and porous interior cores |
| US5185119A (en) * | 1988-01-29 | 1993-02-09 | Husky Injection Molding Systems Ltd. | Injection molding process |
| US5192555A (en) | 1990-02-16 | 1993-03-09 | Husky Injection Molding Systems Ltd. | Apparatus for molding plastic articles |
| IT1248888B (en) * | 1991-06-28 | 1995-01-30 | Acrilux Spa | INJECTION NOZZLE FOR A MOLD |
| JPH05293867A (en) | 1992-04-23 | 1993-11-09 | Toyota Motor Corp | Injection molding device |
| US5482663A (en) * | 1993-10-29 | 1996-01-09 | Hammer's Inc. | Cylindrical body and method and apparatus for making same |
| US5556582A (en) * | 1995-02-17 | 1996-09-17 | Stanford University | Injection molding gate flow control |
| JPH08276454A (en) | 1995-04-07 | 1996-10-22 | Aron Kasei Co Ltd | Injection molding machine and injection molding method |
| US6109910A (en) * | 1997-04-02 | 2000-08-29 | Tohkai Juken Kogyo Kabushiki Kaisha | Injection molding machine for thermoplastic resin |
-
1997
- 1997-06-26 AU AUPO7522A patent/AUPO752297A0/en not_active Abandoned
-
1998
- 1998-05-20 US US09/446,193 patent/US6464910B1/en not_active Expired - Fee Related
- 1998-05-20 JP JP50514899A patent/JP2002506396A/en not_active Ceased
- 1998-05-20 IL IL13348798A patent/IL133487A/en active IP Right Grant
- 1998-05-20 NZ NZ501643A patent/NZ501643A/en unknown
- 1998-05-20 CA CA002295122A patent/CA2295122A1/en not_active Abandoned
- 1998-05-20 WO PCT/AU1998/000370 patent/WO1999000237A1/en not_active Application Discontinuation
- 1998-05-20 EP EP98922502A patent/EP0991515A4/en not_active Withdrawn
- 1998-06-09 ZA ZA984974A patent/ZA984974B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NZ501643A (en) | 2001-10-26 |
| IL133487A0 (en) | 2001-04-30 |
| EP0991515A4 (en) | 2004-05-26 |
| EP0991515A1 (en) | 2000-04-12 |
| WO1999000237A1 (en) | 1999-01-07 |
| AUPO752297A0 (en) | 1997-07-17 |
| JP2002506396A (en) | 2002-02-26 |
| ZA984974B (en) | 1999-04-06 |
| IL133487A (en) | 2003-07-31 |
| US6464910B1 (en) | 2002-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |