JPH0345325A - Apparatus and method for preventing back-flowing in injection molder - Google Patents

Apparatus and method for preventing back-flowing in injection molder

Info

Publication number
JPH0345325A
JPH0345325A JP18041389A JP18041389A JPH0345325A JP H0345325 A JPH0345325 A JP H0345325A JP 18041389 A JP18041389 A JP 18041389A JP 18041389 A JP18041389 A JP 18041389A JP H0345325 A JPH0345325 A JP H0345325A
Authority
JP
Japan
Prior art keywords
screw
pusher
rotated
flow ring
notched
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
JP18041389A
Other languages
Japanese (ja)
Inventor
Katsuhiro Fujii
Seiji Uda
Original Assignee
Japan Steel Works Ltd:The
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:The filed Critical Japan Steel Works Ltd:The
Priority to JP18041389A priority Critical patent/JPH0345325A/en
Publication of JPH0345325A publication Critical patent/JPH0345325A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/46Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50Axially movable screw
    • B29C45/52Non-return devices

Abstract

PURPOSE: To prevent the influx of resin after the finish of plasticizing process and the back- flowing of injected material through a back-flow ring at the start of injection process from occurring by a method wherein the integral rotation of the back-flow ring and a screw is released for the predetermined angle so as to communicate or block the flow path of a pusher and that of the back-flow ring with or off each other through the rotation of the screw.
CONSTITUTION: During plasticizing, when a screw 3 is rotated in the direction indicated with the arrow A, firstly, a back-flow ring 6, which is not fixed to the screw, does not rotate due to a notched part 6b, the width in the direction of rotation of which is larger than the diameter of a pin 5 while only a pusher 4, which is fixed to the screw 3, is rotated. After the pin 5 abuts against the one end 6bA of the notched part 6b under the above-mentioned state, the screw 3 rotates together with the back-flow ring under the condition that the pusher grooves 4a of the pusher 4 communicates with ring grooves 6A. During injection, after the finish of plasticizing, when the screw 3 is rotated in the direction indicated with the arrow B, the back-flow ring 6 does not rotate due to the notched part 6b and only the pusher 4 is rotated. After the abutment of the pin 5 against the other end 6bB of the notched part 6b under the above-mentioned state, the screw 3 is rotated under the blocked state, in which grooves 4a and 6a respectively face to non-grooved parts 4a' and 6a'.
COPYRIGHT: (C)1991,JPO&Japio
JP18041389A 1989-07-14 1989-07-14 Apparatus and method for preventing back-flowing in injection molder Pending JPH0345325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18041389A JPH0345325A (en) 1989-07-14 1989-07-14 Apparatus and method for preventing back-flowing in injection molder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18041389A JPH0345325A (en) 1989-07-14 1989-07-14 Apparatus and method for preventing back-flowing in injection molder

Publications (1)

Publication Number Publication Date
JPH0345325A true JPH0345325A (en) 1991-02-26

Family

ID=16082822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18041389A Pending JPH0345325A (en) 1989-07-14 1989-07-14 Apparatus and method for preventing back-flowing in injection molder

Country Status (1)

Country Link
JP (1) JPH0345325A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0893227A1 (en) * 1997-07-18 1999-01-27 Sumitomo Heavy Industries, Ltd. Back-flow preventing apparatus
EP1101591A1 (en) * 1999-11-12 2001-05-23 Sumitomo Heavy Industries, Ltd. Backflow barrier at the screw head of screw injection moulding machines
EP1594632A2 (en) * 2003-01-27 2005-11-16 Community Enterprises, LLC Devices and methods for maximizing purge effectiveness for molding machines
EP2017060A1 (en) 2007-07-19 2009-01-21 Fanuc Ltd Injection molding machine which carries out controlling of closing operation of a check ring
US7595013B2 (en) 2007-07-23 2009-09-29 Fanuc Ltd Injection molding machine, and method for adjusting a reverse rotation amount of a reverse rotation process in an injection molding machine

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0893227A1 (en) * 1997-07-18 1999-01-27 Sumitomo Heavy Industries, Ltd. Back-flow preventing apparatus
KR100284012B1 (en) * 1997-07-18 2001-04-02 오자와 미토시 Backflow prevention device
EP1101591A1 (en) * 1999-11-12 2001-05-23 Sumitomo Heavy Industries, Ltd. Backflow barrier at the screw head of screw injection moulding machines
KR100406004B1 (en) * 1999-11-12 2003-11-17 스미도모쥬기가이고교 가부시키가이샤 Back-Flow Prevention Apparatus and Method of Operating an Injection Apparatus
EP1594632A2 (en) * 2003-01-27 2005-11-16 Community Enterprises, LLC Devices and methods for maximizing purge effectiveness for molding machines
EP1594632A4 (en) * 2003-01-27 2010-09-01 Community Entpr Llc Devices and methods for maximizing purge effectiveness for molding machines
EP2017060A1 (en) 2007-07-19 2009-01-21 Fanuc Ltd Injection molding machine which carries out controlling of closing operation of a check ring
US7654810B2 (en) 2007-07-19 2010-02-02 Fanuc Ltd. Injection molding machine which carries out controlling of closing operation of a check ring
US7595013B2 (en) 2007-07-23 2009-09-29 Fanuc Ltd Injection molding machine, and method for adjusting a reverse rotation amount of a reverse rotation process in an injection molding machine

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