JPS5714025A - Injection molding - Google Patents

Injection molding

Info

Publication number
JPS5714025A
JPS5714025A JP8968280A JP8968280A JPS5714025A JP S5714025 A JPS5714025 A JP S5714025A JP 8968280 A JP8968280 A JP 8968280A JP 8968280 A JP8968280 A JP 8968280A JP S5714025 A JPS5714025 A JP S5714025A
Authority
JP
Japan
Prior art keywords
molding material
plunger
cavity
filling
pressed
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
JP8968280A
Other languages
Japanese (ja)
Inventor
Tadashi Sato
Masaru Yokoyama
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.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works 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 Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP8968280A priority Critical patent/JPS5714025A/en
Publication of JPS5714025A publication Critical patent/JPS5714025A/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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/57—Exerting after-pressure on the moulding material
    • B29C45/572—Exerting after-pressure on the moulding material using movable mould wall or runner parts

Abstract

PURPOSE:To obtain a molded item having fine appearance as designed, by filling a cavity with a prescribed amount plus a slightly excess amount of a molding material, and pressing the molding material before the setting of it. CONSTITUTION:A cylinder 7 extends to the cavity 6, and a plunger 8 is provided which can be pressed at a lower pressure than the clamping pressure. In the step in which the molding material A is injected and filled, the plunger 8 is a little bit retracted from the cavity surface 8 to fill an excess amount of the molding material corresponding to a volum 10, and after the filling of the molding material and before the setting of it, the plunger 8 is pressed to press the whole molding material, during which the molding material is set.
JP8968280A 1980-06-30 1980-06-30 Injection molding Pending JPS5714025A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8968280A JPS5714025A (en) 1980-06-30 1980-06-30 Injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8968280A JPS5714025A (en) 1980-06-30 1980-06-30 Injection molding

Publications (1)

Publication Number Publication Date
JPS5714025A true JPS5714025A (en) 1982-01-25

Family

ID=13977523

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8968280A Pending JPS5714025A (en) 1980-06-30 1980-06-30 Injection molding

Country Status (1)

Country Link
JP (1) JPS5714025A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823462A (en) * 1987-04-14 1989-04-25 Hilex Poly Company, Inc. Mass air flow sensor assembly and method of manufacture
JPH07137107A (en) * 1994-04-20 1995-05-30 Fanuc Ltd Injection molding method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823462A (en) * 1987-04-14 1989-04-25 Hilex Poly Company, Inc. Mass air flow sensor assembly and method of manufacture
JPH07137107A (en) * 1994-04-20 1995-05-30 Fanuc Ltd Injection molding method

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