JPS55113539A - Injection molding - Google Patents

Injection molding

Info

Publication number
JPS55113539A
JPS55113539A JP2070879A JP2070879A JPS55113539A JP S55113539 A JPS55113539 A JP S55113539A JP 2070879 A JP2070879 A JP 2070879A JP 2070879 A JP2070879 A JP 2070879A JP S55113539 A JPS55113539 A JP S55113539A
Authority
JP
Japan
Prior art keywords
resin
cavity
injected
valves
injection
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.)
Pending
Application number
JP2070879A
Other languages
Japanese (ja)
Inventor
Hiroshi Kataoka
Norito Takao
Kaoru Toyouchi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asahi Dow Ltd
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Dow Ltd
Asahi Chemical Industry Co Ltd
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
Application filed by Asahi Dow Ltd, Asahi Chemical Industry Co Ltd filed Critical Asahi Dow Ltd
Priority to JP2070879A priority Critical patent/JPS55113539A/en
Publication of JPS55113539A publication Critical patent/JPS55113539A/en
Pending legal-status Critical Current

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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To provide a desired uniformed or ununiformed sandwich structure by a method wherein a compressed gas is forced into a mold cavity and the gas outflow speed is regulated, in advance to the injection of a synthetic resin. CONSTITUTION:A compressed gas is forced into a mold cavity through solenoid change-over valves 8, 8', flow control valves 7, 7', conduits 6, 6', and grooves 5, 5', before a first synthetic resin is injected into the cavity. With the valves 8, 8' closed during injection step, the gas pressure in the cavity increases as the injection of the first resin proceed, and the resin is injected preferentially towards the regions of lower gas pressure, so that the resin flows uniformly to both upper and lower regions of the cavity. Therefore, with the valves 8, 8' opened and second synthetic resin injected upon completion of injection of the first resin, there is obtained a uniform sandwich structure. When a ununiform structure is desired, the first resin can be injected ununiformly by providing a gas pressure difference between the upper and lower regions of the cavity.
JP2070879A 1979-02-26 1979-02-26 Injection molding Pending JPS55113539A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2070879A JPS55113539A (en) 1979-02-26 1979-02-26 Injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2070879A JPS55113539A (en) 1979-02-26 1979-02-26 Injection molding

Publications (1)

Publication Number Publication Date
JPS55113539A true JPS55113539A (en) 1980-09-02

Family

ID=12034639

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2070879A Pending JPS55113539A (en) 1979-02-26 1979-02-26 Injection molding

Country Status (1)

Country Link
JP (1) JPS55113539A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432928A (en) * 1981-05-14 1984-02-21 Imperial Chemical Industries Plc Process of moulding filled curable compositions
JPS62231715A (en) * 1986-04-01 1987-10-12 Eng Plast Kk Method for injection molding non-compatible series polymer alloy resin molding
EP0400135A1 (en) * 1988-12-05 1990-12-05 Robert E Carroll Injection mold method and apparatus.
US5458846A (en) * 1988-12-05 1995-10-17 Carroll; Robert E. Method of injection molding
US5558824A (en) * 1994-05-23 1996-09-24 General Motors Corporation Gas-assisted plastics injection molding with controlled melt flow and method of controlling melt flow
US5716560A (en) * 1995-09-14 1998-02-10 Icp Systems, Inc. Gas assisted injection molding combining internal and external gas pressures
US6294126B1 (en) 1997-10-04 2001-09-25 Battenfeld Gmbh Process for controlling gas blanket extent in plastics injection molding
CN113492494A (en) * 2020-04-01 2021-10-12 瑞皇精密工业股份有限公司 Improved structure of mold

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432928A (en) * 1981-05-14 1984-02-21 Imperial Chemical Industries Plc Process of moulding filled curable compositions
JPS62231715A (en) * 1986-04-01 1987-10-12 Eng Plast Kk Method for injection molding non-compatible series polymer alloy resin molding
JPH0358568B2 (en) * 1986-04-01 1991-09-05 Ge Plastics Japan Ltd
EP0400135A1 (en) * 1988-12-05 1990-12-05 Robert E Carroll Injection mold method and apparatus.
US5458846A (en) * 1988-12-05 1995-10-17 Carroll; Robert E. Method of injection molding
US5643527A (en) * 1988-12-05 1997-07-01 Icp Systems, Inc. Method of injection molding
US5558824A (en) * 1994-05-23 1996-09-24 General Motors Corporation Gas-assisted plastics injection molding with controlled melt flow and method of controlling melt flow
US5716560A (en) * 1995-09-14 1998-02-10 Icp Systems, Inc. Gas assisted injection molding combining internal and external gas pressures
US6294126B1 (en) 1997-10-04 2001-09-25 Battenfeld Gmbh Process for controlling gas blanket extent in plastics injection molding
CN113492494A (en) * 2020-04-01 2021-10-12 瑞皇精密工业股份有限公司 Improved structure of mold

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