GB882574A - Improvements in the moulding of plastics - Google Patents

Improvements in the moulding of plastics

Info

Publication number
GB882574A
GB882574A GB128960A GB128960A GB882574A GB 882574 A GB882574 A GB 882574A GB 128960 A GB128960 A GB 128960A GB 128960 A GB128960 A GB 128960A GB 882574 A GB882574 A GB 882574A
Authority
GB
United Kingdom
Prior art keywords
pressure
storage chamber
chamber
polythene
forcing
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
GB128960A
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
Priority to GB128960A priority Critical patent/GB882574A/en
Publication of GB882574A publication Critical patent/GB882574A/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
    • 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
    • B29C2045/467—Means for plasticising or homogenising the moulding material or forcing it into the mould injecting material into the mould by sudden expansion of compressed material in the injection unit

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Thermoplastic compressible materials such as polythene, polystyrene or cellulose acetate butyrate are injection moulded by forcing the material into a storage chamber, incrementally increasing the pressure within the storage chamber by forcing in additional material until it is compressed, and periodically discharging a portion of the compressed material into a mould. Heated polythene is extruded by a screw-type apparatus into a pressure boosting means such as a small hydraulic piston which forces the material into a closed storage chamber until a pressure of 20,000 p.s.i. is reached. An outlet valve is then opened and a shot of material comprising between one fifteenth and one sixtieth of the storage chamber volume flows into and fills the communicating mould owing to the decompressive force and the pressure in the chamber drops to a minimum of 10,000 p.s.i. The pressure on the material in the chamber may be maintained by a compressible fluid such as an inert gas, under pressure acting on a fluid tight movable wall within the chamber.
GB128960A 1960-01-13 1960-01-13 Improvements in the moulding of plastics Expired GB882574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB128960A GB882574A (en) 1960-01-13 1960-01-13 Improvements in the moulding of plastics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB128960A GB882574A (en) 1960-01-13 1960-01-13 Improvements in the moulding of plastics

Publications (1)

Publication Number Publication Date
GB882574A true GB882574A (en) 1961-11-15

Family

ID=9719387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB128960A Expired GB882574A (en) 1960-01-13 1960-01-13 Improvements in the moulding of plastics

Country Status (1)

Country Link
GB (1) GB882574A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2235086A (en) * 1989-06-01 1991-02-20 Ion Tech Ltd Ion beam source
EP1844916A1 (en) * 2006-04-12 2007-10-17 ENGEL AUSTRIA GmbH Device for expansion injection moulding
EP2370243A1 (en) * 2008-12-01 2011-10-05 Husky Injection Molding Systems S.A. A method of operating a molding system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2235086A (en) * 1989-06-01 1991-02-20 Ion Tech Ltd Ion beam source
EP1844916A1 (en) * 2006-04-12 2007-10-17 ENGEL AUSTRIA GmbH Device for expansion injection moulding
EP2370243A1 (en) * 2008-12-01 2011-10-05 Husky Injection Molding Systems S.A. A method of operating a molding system
EP2370243A4 (en) * 2008-12-01 2012-05-30 Husky Injection Molding A method of operating a molding system

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