JPS5791241A - Injection molding method of thick article - Google Patents

Injection molding method of thick article

Info

Publication number
JPS5791241A
JPS5791241A JP55168364A JP16836480A JPS5791241A JP S5791241 A JPS5791241 A JP S5791241A JP 55168364 A JP55168364 A JP 55168364A JP 16836480 A JP16836480 A JP 16836480A JP S5791241 A JPS5791241 A JP S5791241A
Authority
JP
Japan
Prior art keywords
cavity
space
resin
foaming agent
cylinder
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.)
Granted
Application number
JP55168364A
Other languages
Japanese (ja)
Other versions
JPS6258293B2 (en
Inventor
Kenji Takatani
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.)
Zojirushi Corp
Original Assignee
Zojirushi Vacuum Bottle 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 Zojirushi Vacuum Bottle Co Ltd filed Critical Zojirushi Vacuum Bottle Co Ltd
Priority to JP55168364A priority Critical patent/JPS5791241A/en
Publication of JPS5791241A publication Critical patent/JPS5791241A/en
Publication of JPS6258293B2 publication Critical patent/JPS6258293B2/ja
Granted 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To make a hollow part in a thick article, to economize resources and to obtain a good quality molding by a method wherein unhardened resin in the middle of the resin filled into a cavity by the decomposed gas pressure of foaming agent is moved into a space at a reduced pressure. CONSTITUTION:When a screw 7 is advanced after dies are clamped, the molten resin in the front part 5a of a screw cylinder 5 is injected at high pressure and at a high speed from a nozzle 4 into a cavity 14 between the dies. When the screw 7 is retrogated and a space at a reduced pressure is provided in the front part 5a of the cylinder as soon as the inner part of the cavity 14 is filled completely, under the influence of the decomposing gas pressure of the foaming agent contained in the inner resin 22 the molten resin is extruded in the reduced pressure space at the front part 5a of the cylinder and finally a gate 23 is closed to form a space part 24 in the molded article. In the meanwhile, since the hardened layer fixed to the wall surface of the davity 14 is forced against the wall surface of the cavity by the decomposing gas pressure of the foaming agent, a molding excellent in surface luster and dimensional precision can be obtained.
JP55168364A 1980-11-28 1980-11-28 Injection molding method of thick article Granted JPS5791241A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55168364A JPS5791241A (en) 1980-11-28 1980-11-28 Injection molding method of thick article

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55168364A JPS5791241A (en) 1980-11-28 1980-11-28 Injection molding method of thick article

Publications (2)

Publication Number Publication Date
JPS5791241A true JPS5791241A (en) 1982-06-07
JPS6258293B2 JPS6258293B2 (en) 1987-12-04

Family

ID=15866708

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55168364A Granted JPS5791241A (en) 1980-11-28 1980-11-28 Injection molding method of thick article

Country Status (1)

Country Link
JP (1) JPS5791241A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285301A (en) * 1988-04-08 1989-11-16 Andreas Stihl:Fa Bent blip for portable type power chain saw and manufacture thereof
JPH02295714A (en) * 1989-04-21 1990-12-06 Kloeckner Ferromatik Desma Gmbh Extrusion molding of synthetic resin filled with fluid and its apparatus
EP0587730A1 (en) * 1991-06-03 1994-03-23 Siebolt Hettinga Process for injection molding a hollow plastic article
JP2001198942A (en) * 2000-01-24 2001-07-24 Sumitomo Heavy Ind Ltd Method for molding foamed molded article and injection molding machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2079317C (en) * 1991-01-30 1998-01-06 Maki Horikoshi Injection-molded hollow article, hollow injection molding method and metal mold therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01285301A (en) * 1988-04-08 1989-11-16 Andreas Stihl:Fa Bent blip for portable type power chain saw and manufacture thereof
JPH02295714A (en) * 1989-04-21 1990-12-06 Kloeckner Ferromatik Desma Gmbh Extrusion molding of synthetic resin filled with fluid and its apparatus
EP0587730A1 (en) * 1991-06-03 1994-03-23 Siebolt Hettinga Process for injection molding a hollow plastic article
EP0587730A4 (en) * 1991-06-03 1995-03-22 Siebolt Hettinga Process for injection molding a hollow plastic article.
JP2001198942A (en) * 2000-01-24 2001-07-24 Sumitomo Heavy Ind Ltd Method for molding foamed molded article and injection molding machine

Also Published As

Publication number Publication date
JPS6258293B2 (en) 1987-12-04

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