JPS5795427A - Injection molding - Google Patents

Injection molding

Info

Publication number
JPS5795427A
JPS5795427A JP55171170A JP17117080A JPS5795427A JP S5795427 A JPS5795427 A JP S5795427A JP 55171170 A JP55171170 A JP 55171170A JP 17117080 A JP17117080 A JP 17117080A JP S5795427 A JPS5795427 A JP S5795427A
Authority
JP
Japan
Prior art keywords
screw
hydraulic pressure
resin
reverse flow
over valve
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
JP55171170A
Other languages
Japanese (ja)
Inventor
Yutaka Tsukahara
Hideo Sakanishi
Takeo Tashiro
Masao Hirozawa
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.)
Shibaura Machine Co Ltd
Original Assignee
Toshiba Machine 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 Toshiba Machine Co Ltd filed Critical Toshiba Machine Co Ltd
Priority to JP55171170A priority Critical patent/JPS5795427A/en
Publication of JPS5795427A publication Critical patent/JPS5795427A/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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/52—Non-return devices
    • 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
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw

Landscapes

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

Abstract

PURPOSE:To eliminate defect in production such as insufficient weight of the product by exerting hydraulic pressure at the back of a screw before injection for a specified time before injection to make a reverse flow prevention screw retreat to the screw side and completely close the resin channel. CONSTITUTION:After a weighed amount of molten resin (a) is filled in a cavity 5 by rotating the screw 3 of an inline screw type injection molding machine, that is, after an electromagnetic change-over valve 11 has taken its middle position, an electromagnetic change-over valve 13 to control the pre-shut of a reverse flow preventing ring 1 is held at the position (a) for a specified time T, and the hydraulic pressure from a hydraulic pressure source 8 is made to work on an oil chamber 7 and a screw 3 is pressed against the side of a screw head 2 for time T. In this arrangement the ring 1 contacts closely the end face A of the screw 3 to close completely the resin channel, which makes the amount of injected resin always constant, and thereby the injection molded products have constant weight and shape.
JP55171170A 1980-12-04 1980-12-04 Injection molding Pending JPS5795427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55171170A JPS5795427A (en) 1980-12-04 1980-12-04 Injection molding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55171170A JPS5795427A (en) 1980-12-04 1980-12-04 Injection molding

Publications (1)

Publication Number Publication Date
JPS5795427A true JPS5795427A (en) 1982-06-14

Family

ID=15918289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55171170A Pending JPS5795427A (en) 1980-12-04 1980-12-04 Injection molding

Country Status (1)

Country Link
JP (1) JPS5795427A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03230930A (en) * 1990-02-05 1991-10-14 Mitsubishi Heavy Ind Ltd Fixed volume molding method of injection molding machine
JPH04250016A (en) * 1990-12-27 1992-09-04 Niigata Eng Co Ltd Measuring method of injection molding machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031562A (en) * 1973-07-25 1975-03-28
JPS541575A (en) * 1977-06-01 1979-01-08 Grapha Holding Ag Paper feeder for at least one of paper piece treating machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5031562A (en) * 1973-07-25 1975-03-28
JPS541575A (en) * 1977-06-01 1979-01-08 Grapha Holding Ag Paper feeder for at least one of paper piece treating machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03230930A (en) * 1990-02-05 1991-10-14 Mitsubishi Heavy Ind Ltd Fixed volume molding method of injection molding machine
JPH04250016A (en) * 1990-12-27 1992-09-04 Niigata Eng Co Ltd Measuring method of injection molding machine

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