WO1998039150B1 - Gas-assisted injection molding of large panels with sequential gating - Google Patents

Gas-assisted injection molding of large panels with sequential gating

Info

Publication number
WO1998039150B1
WO1998039150B1 PCT/US1998/004517 US9804517W WO9839150B1 WO 1998039150 B1 WO1998039150 B1 WO 1998039150B1 US 9804517 W US9804517 W US 9804517W WO 9839150 B1 WO9839150 B1 WO 9839150B1
Authority
WO
WIPO (PCT)
Prior art keywords
thermoplastic resin
location
mold cavity
molten thermoplastic
molding
Prior art date
Application number
PCT/US1998/004517
Other languages
French (fr)
Other versions
WO1998039150A2 (en
WO1998039150A3 (en
Inventor
Frederick P Keller
John E Misner
Daniel J Fild
Original Assignee
Cascade Eng Inc
Frederick P Keller
John E Misner
Daniel J Fild
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US08/914,684 external-priority patent/US6063315A/en
Application filed by Cascade Eng Inc, Frederick P Keller, John E Misner, Daniel J Fild filed Critical Cascade Eng Inc
Priority to AU65457/98A priority Critical patent/AU6545798A/en
Publication of WO1998039150A2 publication Critical patent/WO1998039150A2/en
Publication of WO1998039150A3 publication Critical patent/WO1998039150A3/en
Publication of WO1998039150B1 publication Critical patent/WO1998039150B1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/04—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of synthetic material
    • B62D29/046—Combined superstructure and frame, i.e. monocoque constructions
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/114—Single butt joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/54—Joining several hollow-preforms, e.g. half-shells, to form hollow articles, e.g. for making balls, containers; Joining several hollow-preforms, e.g. half-cylinders, to form tubular articles
    • 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
    • B29C45/0025—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks
    • B29C2045/0032—Preventing defects on the moulded article, e.g. weld lines, shrinkage marks sequential injection from multiple gates, e.g. to avoid weld lines
    • 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
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • 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
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3055—Cars

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Molding of relatively large articles such as automobile body parts by gas-assisted injection molding with sequential gating of injected thermoplastic resin into the mold cavity. Elongated ribs in the parts form gas channels and strengthening ribs for the parts. Structural parts are made by adhesively joining two such parts made by gas-assisted injection molding through a combination of hollow ribs and joining flanges at sides of the parts.

Claims

AMENDED CLAIMS[received by the International Bureau on 11 February 1999 (11.02.99); original claims 1-36 replaced by amended claims 1-46 (9 pages)]
1. A method of molding a relatively large article in a mold cavity comprising the steps of: injecting molten thermoplastic resin into the mold cavity at a first location and flowing the thermoplastic resin from the first location to a second location spaced from the first location; injecting molten thermoplastic resin into the mold cavity at the second location substantially simultaneously with the arrival of the molten thermoplastic resin from the first location at the second location; discontinuing the flow of molten thermoplastic resin to the first location; subsequent to the arrival of molten thermoplastic at the second location, injecting an inert gas under pressure into the molten thermoplastic resin in the mold cavity to assist in distributing the molten thermoplastic resin to the edges of the mold cavity; cooling the thermoplastic resin at least to a solid state; venting the gas from the mold cavity; and opening the mold and removing the thus-molded article from the mold cavity.
2. A method of molding a relatively large article according to claim 1 wherein the flow of molten thermoplastic resin to the first location is discontinued at about the time the injection of the molten thermoplastic resin into the mold cavity at the second location is commenced.
3. A method of molding a relatively large article according to claim 2 wherein the commencement of the injection of inert gas under pressure into the mold cavity takes place about the time the flow of molten thermoplastic resin to the first location is discontinued.
4. A method of molding a relatively large article according to claim 3 wherein the mold cavity has an elongated rib cavity and the inert gas is injected into the rib cavity, thereby forming a hollow rib in the article.
5. A method for molding a relatively large article according to claim 4 and further comprising the steps of: flowing the molten thermoplastic resin in the mold cavity from the first or second location to a third location spaced from the first and second locations and injecting molten thermoplastic resin into the mold cavity at the third location substantially simultaneously with the arrival of the molten thermoplastic resin at the third location from the first or second locations; and discontinuing the flow of molten thermoplastic resin to the second location.
6. A method for molding a relatively large article according to claim 5 wherein the flow of molten thermoplastic resin to the second location is discontinued at about the time the injection of the molten thermoplastic resin into the mold cavity at the third location is commenced.
7. A method for molding a relatively large article according to claim 6 wherein the step of injecting an inert gas under pressure into molten thermoplastic resin in the mold cavity comprises injecting the inert gas at spaced positions in the mold.
8. A method of molding a relatively large article according to claim 7 and further comprising the step of discontinuing the flow of molten thermoplastic resin to the third location.
9. A method of molding a relatively large article according to claim 8 wherein the commencement of the injection of the inert gas under pressure into the mold cavity takes place about the time the flow of molten thermoplastic resin to the third location is discontinued.
10. A method of molding a relatively large article according to claim 1 wherein the mold cavity has an elongated rib cavity and the molten thermoplastic resin and the inert gas are injected into the rib cavity, thereby forming a hollow rib in the article.
1 1. An article made in accordance with the method of claim 1.
12. An article made in accordance with the method of claim 4.
13. An article made in accordance with the method of claim 5.
14. An article made in accordance with the method of claim 10.
15. A method of molding a relatively large article in a mold cavity according to claim 1 and further comprising the step of sensing the arrival of the molten thermoplastic resin from the first location at the second location and controlling the step of injecting the molten thermoplastic resin into the mold cavity at the second location in response to the sensed arrival of the thermoplastic resin at the second location.
16. A method of molding a relatively large article according to claim 15, wherein the sensing step comprises sensing the pressure of the molten thermoplastic material in the mold at the second location.
17. A method of molding a relatively large article according to claim 15, wherein the step of sensing the arrival of the molten thermoplastic resin at the second location comprises sensing the temperature at the second location.
18. A method of molding a relatively large article according to claim 1, wherein the molten thermoplastic material is PET filled with glass fibers.
19. A method of molding a relatively large article according to claim 1 , wherein the molten thermoplastic resin is a glass-filled polypropylene/polystyrene alloy.
20. An apparatus for molding a relatively large article comprising: first and second mold halves defining a mold cavity therebetween; a first injection conduit in one of the mold halves for injecting molten thermoplastic resin into the mold cavity at a first location; a first gate valve connected to the first injection conduit for controlling the flow of thermoplastic resin through the first injection conduit to the mold cavity; a second injection conduit in one of the mold cavities for injecting molten thermoplastic resin into the mold cavity at a second location spaced from the first location; a second gate valve connected to the second injection conduit for controlling the flow of thermoplastic resin through the second injection conduit to the mold cavity; a controller connected to the first and second gate valves for controlling the opening and closing of the first and second gate valves, the controller being programmed to open the first gate valve and to close the second gate valve during an initial period of time in which molten thermoplastic resin is injected under pressure into the mold cavity through the first injection conduit and to open the second gate valve substantially simultaneously with the arrival of the molten thermoplastic resin at the second injection conduit from the first injection conduit and to thereafter close the first gate valve to terminate the flow of molten thermoplastic resin into the mold cavity from the first injection conduit; a gas-injection conduit with a gas control valve and connected to the moid cavity for injecting an inert gas under pressure into molten thermoplastic in the mold cavity to force the molten thermoplastic resin to the edges of the mold cavity; and the controller is connected to the gas control valve and is further programmed to open the gas control valve to inject inert gas under pressure into the mold cavity at a time interval after the first gate valve is opened.
21. An apparatus for molding a relatively large article according to claim 20 wherein the controller is programmed to close the first gate valve to discontinue the flow of molten thermoplastic resin to the first injection conduit at about the time the second gate valve is opened.
22. An apparatus for molding a relatively large article according to claim 21 wherein the controller is further programmed to open the gas control valve about the time that the second gate valve is closed.
23. An apparatus for molding a relatively large article according to claim 22 wherein the mold cavity has a rib cavity and the gas- injection conduit is connected to the rib cavity.
24. An apparatus for molding a relatively large article according to claim 23 and further comprising a third injection conduit in one of the mold cavities for injecting molten thermoplastic resin into the mold cavity at a third location spaced from the first and second locations for injecting molten thermoplastic resin into the mold cavity at the third location; a third gate valve is connected to the third injection conduit for controlling the flow of thermoplastic resin through the third injection conduit to the mold cavity; and the controller is further connected to the third gate valve for controlling the opening and closing of the third gate valve, the controller being programmed to open the third gate valve and to close the second gate valve substantially simultaneously with the arrival of the molten thermoplastic resin at the third injection conduit from the first or second injection conduits and to thereafter close the second gate valve to terminate the flow of molten thermoplastic resin into the mold cavity from the second injection conduit.
25. An apparatus for molding a relatively large article according to claim 24 wherein the controller is programmed to close the second gate valve to terminate the flow of molten thermoplastic resin into the second injection conduit at about the time the third gate valve is opened to inject molten thermoplastic resin into the mold cavity through the third injection conduit.
26. An apparatus for molding a relatively large article according to claim 25 wherein the first gas injection conduit communicates with an area of the mold cavity in the vicinity of the first injection conduit and further comprising: a second gas injection conduit with a second gas control valve communicating with the mold cavity in the vicinity of the second injection conduit for injecting an inert gas under pressure into the mold cavity in the vicinity of the second injection conduit to assist in the distribution of molten thermoplastic resin to the edges of the mold cavity.
27. An apparatus for molding a relatively large article according to claim 26 wherein the controller is programmed to open the second gas control valve to inject inert gas under pressure into the mold cavity in the vicinity of the second injection conduit about the time the third gate valve is closed.
28. An apparatus for molding a relatively large article according to claim 27 and further comprising: a third gas injection conduit with a third gas control valve and communicating with the mold cavity in the vicinity of the third injection conduit for injecting an inert gas under pressure into the mold cavity in the vicinity of the third injection conduit to assist in the distribution of molten thermoplastic resin to the edges of the mold cavity; the controller is programmed to close the third gate valve to discontinue the flow of molten thermoplastic resin to the third injection conduit; and the controller is further programmed to open the third gas control valve to inject an inert gas under pressure into the mold cavity in the vicinity of the third injection conduit.
29. An apparatus for molding a relatively large article according to claim 28 wherein the controller is programmed to open the third gas control valve about the time the third gate valve is closed.
30. An apparatus for molding a relatively large article according to claim 20 wherein the controller is further programmed to open the gas control valve about the time that the second gate valve is closed.
31. An apparatus for molding a relatively large article according to claim 20 wherein the mold cavity has a rib cavity and the gas- injection conduit communicates with the rib cavity to inject gas under pressure into the rib cavity.
32. An apparatus for molding a relatively large article according to claim 31 wheTein the first and second injection conduits terminate in the rib cavity whereby molten thermoplastic resin can be injected into the rib cavity.
33. In a structural article of relatively large ditnensions comprising first and second injection-molded shells, each of which has an outer surface and an inner surface, and the inner surfaces of each of the shells including bonding surfaces, and wherein the first and second shells are in registry with each other, the inner surfaces thereof facing each other and bonded together at the bonding surfaces thereof, the improvement which comprises: - 40 -
at least one bonding surface is formed from a rib with a hollow gas channel formed by gas injection during injection molding of one of the first and second shells.
34. A structural article according to claim 33 wherein the inner surfaces of the first and second shells have walls which define at least one hollow passageway which forms a structural spine for the structural article and the rib forms a portion of the hollow passageway walls.
35. A structural article according to claim 34 wherein there are two ribs formed in the walls of the at least one hollow passageway.
36. A structural article according to claim 35 wherein the ribs are diametrically opposed to each other across the hollow passageway.
37. A structural article according to claim 35 wherein the structural article is an automobile body portion.
38. A structural article according to claim 33 wherein the structural article is an automobile body portion.
39. A structural article according to claim 33 wherein the first and second shells are dish-shaped and the first shell nests within the second shell.
40. A structural article according to claim 33 wherein the structural article has a size in excess of five feet in at least one dimension.
41. A structural article according to claim 33 wherein the shells are generally of the same shape and size.
42. A method of molding a relatively large article in a mold cavity comprising the steps of: - 41 -
injecting molten thermoplastic resin into the mold cavity at a first location and flowing the thermoplastic resin from the first location to a second location spaced from the first location; sensing the arrival of the molten thermoplastic resin at the second location; injecting molten thermoplastic resin into the mold cavity at the second location substantially simultaneously with the arrival of the molten thermoplastic resin from the first location at the second location; controlling the step of injecting the molten thermoplastic resin into the mold cavity at the second location in response to the sensed arrival of the thermoplastic resin at the second location; discontinuing the flow of molten thermoplastic resin to the first location; cooling the thermoplastic resin at least to a solid state; and opening the mold and removing the thus-molded article from the mold cavity.
43. A method of molding a relatively large article according to claim 42, wherein the sensing step comprises sensing the pressure in the mold at the second location.
44. A method of molding a relatively large article according to claim 43, wherein the sensing step comprises sensing the heat in the mold at the second location.
45. A method of molding a relatively large article according to claim 42, wherein the thermoplastic resin is PET filled with glass fibers.
46. A method of molding a relatively large article according to claim 42, wherein the thermoplastic resin is a glass-filled polypropylene/polystyrene alloy.
PCT/US1998/004517 1997-03-07 1998-03-06 Gas-assisted injection molding of large panels with sequential gating WO1998039150A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU65457/98A AU6545798A (en) 1997-03-07 1998-03-06 Gas-assisted injection molding of large panels with sequential gating

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US4033897P 1997-03-07 1997-03-07
US60/040,338 1997-05-23
US08/914,684 US6063315A (en) 1997-03-07 1997-08-19 Gas-assisted injection molding of large panels with sequential gating
US08/914,684 1997-08-19

Publications (3)

Publication Number Publication Date
WO1998039150A2 WO1998039150A2 (en) 1998-09-11
WO1998039150A3 WO1998039150A3 (en) 1999-02-18
WO1998039150B1 true WO1998039150B1 (en) 1999-03-25

Family

ID=26716980

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/004517 WO1998039150A2 (en) 1997-03-07 1998-03-06 Gas-assisted injection molding of large panels with sequential gating

Country Status (2)

Country Link
AU (1) AU6545798A (en)
WO (1) WO1998039150A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6998174B2 (en) 2000-02-24 2006-02-14 Conix Corporation Integrated co-injection molded vehicle components and methods of making the same
DE60139605D1 (en) * 2000-02-24 2009-10-01 Conix Corp Multi-component injection molding process with liquid injection for articles with weld lines and articles produced therewith
US6843954B2 (en) 2000-02-24 2005-01-18 Conix Corporation Injection molding techniques utilizing fluid channels
US7320765B2 (en) * 2004-04-30 2008-01-22 International Automotive Components Group North America, Inc. Gas pin for thermocouple for gas assisted injection molding
US7182892B2 (en) 2004-04-30 2007-02-27 Lear Corporation Gas assisted injection molding with fixed volume gas reservoir and temperature control
DE102004031546A1 (en) * 2004-06-29 2006-02-09 Priamus System Technologies Ag Method for filling at least one cavity
US7255818B2 (en) * 2004-11-08 2007-08-14 Lear Corporation Process control for gas-assisted injection molding applications
ES2827212T3 (en) * 2012-04-23 2021-05-20 Abb Schweiz Ag Method for injection molding thermoplastic pole pieces and its execution mold

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8003800A (en) * 1980-07-01 1982-02-01 Stamicarbon METHOD AND APPARATUS FOR INJECTION MOLDING OF PLASTICS.
US5162092A (en) 1990-11-29 1992-11-10 Cascade Engineering, Inc. Gas-assisted injection molding with a carpet layer
US5401459A (en) * 1992-10-05 1995-03-28 Infiltrator Systems, Inc. Gas-assisted injection molding of hollow ribbed article
FR2702990B1 (en) * 1993-03-23 1995-06-16 Eurostyle Sa Process for decorating a thermoplastic support by low pressure overmolding, decor and products obtained according to this process.
EP0630731A1 (en) * 1993-06-23 1994-12-28 Siebolt Hettinga Method for molding a plastic article using a multi-point volume control system

Also Published As

Publication number Publication date
WO1998039150A2 (en) 1998-09-11
WO1998039150A3 (en) 1999-02-18
AU6545798A (en) 1998-09-22

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