JPS6451921A - Injection molding method for thermoplastic resin - Google Patents

Injection molding method for thermoplastic resin

Info

Publication number
JPS6451921A
JPS6451921A JP20794687A JP20794687A JPS6451921A JP S6451921 A JPS6451921 A JP S6451921A JP 20794687 A JP20794687 A JP 20794687A JP 20794687 A JP20794687 A JP 20794687A JP S6451921 A JPS6451921 A JP S6451921A
Authority
JP
Japan
Prior art keywords
gate
cooling
time
molding cycle
gas
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
JP20794687A
Other languages
Japanese (ja)
Inventor
Takashi Chikada
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.)
Polyplastics Co Ltd
Original Assignee
Polyplastics 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 Polyplastics Co Ltd filed Critical Polyplastics Co Ltd
Priority to JP20794687A priority Critical patent/JPS6451921A/en
Publication of JPS6451921A publication Critical patent/JPS6451921A/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2737—Heating or cooling means therefor

Landscapes

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

Abstract

PURPOSE:To shorten a molding cycle by quickening gate sealing time and accelerating cooling of a gate, by a method wherein a cooling hole for cooling the gate is provided in the vicinity of the gate and a low-temperature gas is caused to flow as a cooling medium intermittently for a specific period of time in accordance with a molding cycle. CONSTITUTION:Cooling gas is caused to flow intermittently for a specific period of time in accordance with a molding cycle by making use of the gas, whose specific heat per unit volume is extremely low, as a refrigerant. With this construction, as a cooling gas passage 1 is provided close by a gate 2, a gate part is cooled during circulation of cooling gas, which acts effectively upon shortening of gate sealing time. A temperature of the gate part is restored to an original level rapidly during a suspension period of time of the refrigerant, inconvenience does not occur at all in filling resin, and it becomes possible that the temperature of the gate part can be changed sensitively and effectively in according with a molding cycle.
JP20794687A 1987-08-21 1987-08-21 Injection molding method for thermoplastic resin Pending JPS6451921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20794687A JPS6451921A (en) 1987-08-21 1987-08-21 Injection molding method for thermoplastic resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20794687A JPS6451921A (en) 1987-08-21 1987-08-21 Injection molding method for thermoplastic resin

Publications (1)

Publication Number Publication Date
JPS6451921A true JPS6451921A (en) 1989-02-28

Family

ID=16548157

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20794687A Pending JPS6451921A (en) 1987-08-21 1987-08-21 Injection molding method for thermoplastic resin

Country Status (1)

Country Link
JP (1) JPS6451921A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04187415A (en) * 1990-11-20 1992-07-06 Sansho Giken Kk Hot runner type mold for synthetic resin
JP2009172945A (en) * 2008-01-28 2009-08-06 Kojima Press Co Ltd Heating system and heating method for molding metallic mold and method of manufacturing resin molded article

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5874332A (en) * 1981-10-30 1983-05-04 Sei Tsutsumi Method and device for injection molding of synthetic resin
JPS5889335A (en) * 1981-11-20 1983-05-27 Sei Tsutsumi Method and apparatus for injecting synthetic resin
JPS6359510A (en) * 1986-08-30 1988-03-15 Nippon Plast Co Ltd Method for preventing hot runner gate from cobwebbing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5874332A (en) * 1981-10-30 1983-05-04 Sei Tsutsumi Method and device for injection molding of synthetic resin
JPS5889335A (en) * 1981-11-20 1983-05-27 Sei Tsutsumi Method and apparatus for injecting synthetic resin
JPS6359510A (en) * 1986-08-30 1988-03-15 Nippon Plast Co Ltd Method for preventing hot runner gate from cobwebbing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04187415A (en) * 1990-11-20 1992-07-06 Sansho Giken Kk Hot runner type mold for synthetic resin
JP2009172945A (en) * 2008-01-28 2009-08-06 Kojima Press Co Ltd Heating system and heating method for molding metallic mold and method of manufacturing resin molded article

Similar Documents

Publication Publication Date Title
JPS5774142A (en) Vulcanizing method for elastomer article
JPS6451921A (en) Injection molding method for thermoplastic resin
JPS55159952A (en) Cooling method for metal mold at injection molding
JPS5724220A (en) Mold device for injection molding
JPS5660209A (en) Metal mold device for molding semiconductor element with resin sealing member
JPS5722034A (en) Molding method for thermosetting material
JPS5655219A (en) Method of adjusting mold temperature and device thereof
JPS6418620A (en) Mold temperature adjusting apparatus for injection molding machine
JPS536360A (en) Method of heating and cooling mold for injection molding
EP0530503A3 (en) Injection-molding metal mold and body molded by using the same
JPS57105321A (en) Method for cooling parison in mold
JPS52137753A (en) Refrigerator
JPS55148136A (en) Injection molding method of synthetic resin
GB1411837A (en) Transfer moulding
JPS55161665A (en) Liquid injection recording method
JPS5777551A (en) Vulcanizing of elastomer article
JPS53128037A (en) Refrigeration apparatus
JPS5513932A (en) Transfer mold for semiconductor device
JPS57120052A (en) Heat insulating box for solar energy collector and manufacture thereof
JPS56155715A (en) Manufacturing device for resin pipe
JPS57137130A (en) Method for resin sealing
JPS5385560A (en) Refrigerating cycle
JPS57109619A (en) Injection compression molding of record disk
JPS53109242A (en) Refrigerating plant
JPS56130332A (en) Shrinkage dent preventive molding