JPS5569435A - Method of controlling injection molding machine - Google Patents

Method of controlling injection molding machine

Info

Publication number
JPS5569435A
JPS5569435A JP14227678A JP14227678A JPS5569435A JP S5569435 A JPS5569435 A JP S5569435A JP 14227678 A JP14227678 A JP 14227678A JP 14227678 A JP14227678 A JP 14227678A JP S5569435 A JPS5569435 A JP S5569435A
Authority
JP
Japan
Prior art keywords
resin
mold
pressure
needle valve
nozzle
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
JP14227678A
Other languages
Japanese (ja)
Inventor
Tsukasa Shiroganeya
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.)
Japan Steel Works Ltd
Original Assignee
Japan Steel 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 Japan Steel Works Ltd filed Critical Japan Steel Works Ltd
Priority to JP14227678A priority Critical patent/JPS5569435A/en
Publication of JPS5569435A publication Critical patent/JPS5569435A/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

Abstract

PURPOSE:To stably obtain a product of prescribed form, by closing the nozzle of an injection cylinder for a prescribed time after the pressure in a mold has become a predetermined value, and then opening the nozzle again to maintain the pressure. CONSTITUTION:A nozzle 2 at the front end of an injection cylinder 1 is fitted with a needle valve 3 to adjust an injection passage for a molten resin. The passage is controlled by an in-mold resin pressure detector 8, a controller 10, a cylinder 6, a link 5, etc. The needle valve 3 is opened to inject the resin into a metal mold 9. When the pressure of the resin in the mold has reached a set maximum value Pmax, the needle valve 3 is closed according to an instruction from the controller 10. After a prescribed time thetas has elapsed in that state or when the pressure of the resin in the mold has reached a prescribed value Ps, the needle valve 3 is opened again to inject an additional quantity of such a resin to compensate the contraction of the former injected resin due to cooling. The pressure of the resin in the mold is thus maintained. After the injection, the needle valve 3 is closed. Plasticization is then effected.
JP14227678A 1978-11-20 1978-11-20 Method of controlling injection molding machine Pending JPS5569435A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14227678A JPS5569435A (en) 1978-11-20 1978-11-20 Method of controlling injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14227678A JPS5569435A (en) 1978-11-20 1978-11-20 Method of controlling injection molding machine

Publications (1)

Publication Number Publication Date
JPS5569435A true JPS5569435A (en) 1980-05-26

Family

ID=15311584

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14227678A Pending JPS5569435A (en) 1978-11-20 1978-11-20 Method of controlling injection molding machine

Country Status (1)

Country Link
JP (1) JPS5569435A (en)

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