GB985649A - Improvements in injection moulding machines and their operation - Google Patents

Improvements in injection moulding machines and their operation

Info

Publication number
GB985649A
GB985649A GB882964A GB882964A GB985649A GB 985649 A GB985649 A GB 985649A GB 882964 A GB882964 A GB 882964A GB 882964 A GB882964 A GB 882964A GB 985649 A GB985649 A GB 985649A
Authority
GB
United Kingdom
Prior art keywords
worm
injection moulding
nozzle
valve
energizes
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.)
Expired
Application number
GB882964A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB985649A publication Critical patent/GB985649A/en
Expired 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
    • 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
    • B29C2045/5096—Axially movable screw decompression of the moulding material by retraction or opposite rotation of the screw

Landscapes

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

Abstract

985,649. Injection moulding machines. F. STUBBE. March 3, 1964 [April 19, 1963], No. 8829/64. Heading B5A. In an injection moulding machine having an open injection nozzle 10 and an axially reciprocable worm 3, a back pressure is applied to the worm 3 during its retraction stroke and this pressure is released at the end of the retraction stroke to prevent loss of material through the nozzle when the mould 11 is opened. The back pressure is produced by a needle valve 14 connected to a cylinder 6 having a piston 7 connected to the worm 3. When the worm 3 has moved to the right, a limit switch 15 energizes a device 17 to open the valve 14. The switch 15 also energizes a delay timer 16 whereby after a suitable interval a valve 20 admits hydraulic fluid to the cylinder 6 so that the piston 7 is moved further to the right and the worm 3 sucks back material from the nozzle 10.
GB882964A 1963-04-19 1964-03-03 Improvements in injection moulding machines and their operation Expired GB985649A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST020517 1963-04-19

Publications (1)

Publication Number Publication Date
GB985649A true GB985649A (en) 1965-03-10

Family

ID=7458603

Family Applications (1)

Application Number Title Priority Date Filing Date
GB882964A Expired GB985649A (en) 1963-04-19 1964-03-03 Improvements in injection moulding machines and their operation

Country Status (1)

Country Link
GB (1) GB985649A (en)

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