JPS55137935A - Manifold structure for sprueless injection molding machine - Google Patents

Manifold structure for sprueless injection molding machine

Info

Publication number
JPS55137935A
JPS55137935A JP4634879A JP4634879A JPS55137935A JP S55137935 A JPS55137935 A JP S55137935A JP 4634879 A JP4634879 A JP 4634879A JP 4634879 A JP4634879 A JP 4634879A JP S55137935 A JPS55137935 A JP S55137935A
Authority
JP
Japan
Prior art keywords
resin
torpedo
movable
manifold
hollow
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
JP4634879A
Other languages
Japanese (ja)
Inventor
Munetomo Torii
Toshiyuki Akamatsu
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 JP4634879A priority Critical patent/JPS55137935A/en
Publication of JPS55137935A publication Critical patent/JPS55137935A/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
    • B29C45/72—Heating or cooling
    • B29C45/74—Heating or cooling of the injection unit
    • 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
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • B29C45/231—Needle valve systems therefor

Landscapes

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

Abstract

PURPOSE:To injection-mold a thermosetting resin without gelling the same, by using a sprueless injection molding machine having a stationary torpedo portion fastened to a manifold, a movable torpedo portion adapted to be moved forwardly and backwardly, and a temperature regulation heater disposed in the torpedo. CONSTITUTION:When the amount of a resin in a front end portion of a cylinder 2 has reached a predetermined level, the resin is injected by a screw 1 into a hollow 13 in a manifold 3. The temperature of the resin in the manifold 3 is regulated from the side of a torpedo 7 provided with a heater 8 therein and from the side of the inner surface of the monifold 3. Accordingly, the resin advances toward a nozzle portion 4 without being locally heated to be gelled. When the resin in injected into the hollow 13, the pressure therein increases to allow a movable torpedo portion 7b to be moved backwardly. As a result, the nozzle portion 4 is opened so that the resin flows into cavities 6 via a sprue portion 11 and a runner portion 10. When a movable mold 5b is separated after the resin has been hardened, the pressure in the hollow 13 decreases so that the movable torpedo portion 7b is moved forwardly by the resilient force of a spring 16. The nozzle portion 4 is thereby closed as partially gelled resin is forced out therefrom by the movable torpedo portion 7b.
JP4634879A 1979-04-15 1979-04-15 Manifold structure for sprueless injection molding machine Pending JPS55137935A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4634879A JPS55137935A (en) 1979-04-15 1979-04-15 Manifold structure for sprueless injection molding machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4634879A JPS55137935A (en) 1979-04-15 1979-04-15 Manifold structure for sprueless injection molding machine

Publications (1)

Publication Number Publication Date
JPS55137935A true JPS55137935A (en) 1980-10-28

Family

ID=12744628

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4634879A Pending JPS55137935A (en) 1979-04-15 1979-04-15 Manifold structure for sprueless injection molding machine

Country Status (1)

Country Link
JP (1) JPS55137935A (en)

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