GB702308A - Method of and apparatus for moulding polythene - Google Patents

Method of and apparatus for moulding polythene

Info

Publication number
GB702308A
GB702308A GB3366/52A GB336652A GB702308A GB 702308 A GB702308 A GB 702308A GB 3366/52 A GB3366/52 A GB 3366/52A GB 336652 A GB336652 A GB 336652A GB 702308 A GB702308 A GB 702308A
Authority
GB
United Kingdom
Prior art keywords
moulding
inch
coating
mould
polytrifluorochloroethylene
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
GB3366/52A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB702308A publication Critical patent/GB702308A/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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2827/00—Use of polyvinylhalogenides or derivatives thereof as mould material
    • B29K2827/12—Use of polyvinylhalogenides or derivatives thereof as mould material containing fluorine

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Table Devices Or Equipment (AREA)
  • Paints Or Removers (AREA)

Abstract

Polythene is moulded in a metal mould, at least part of the moulding surface of which has a coating 0.0005 - 0.0015 inch thick of polytetrafluoroethylene, polytrifluorochloroethylene, a thermoset resin which is resistant to the moulding temperature and has a coefficient of thermal conductivity below 6 B.T.U./sq. ft./hour/ DEG F./inch, or a combination of such resins. Polytetrafluoroethylene and polytrifluorochloroethylene may be applied as a fluid dispersion in water or in an organic liquid and then baked on the surface. The thermoset resins may be applied in a suitable solvent by spraying or dipping and cured on the surface, the heat removing the solvent. The preferred thickness for the coating is 0.002 - 0.003 inch and the preferred thermal conductivity is 1.0 - 2.5 B.T.U./sq. ft./hour/ DEG F./inch. The invention is chiefly advantageous for injection moulding, and the mould may be of any usual metal, steel or beryllium copper alloy being mentioned. If the coating is applied to parts only of the moulding surface to form a pattern, a glossier surface is produced on the article corresponding to that pattern. To the ethylene polymer moulding powder may be added small amounts of, e.g. heat and light stabilizers, pigments, or anti-static agents, and it should preferably be heated to 275 DEG F.-450 DEG F., the mould temperature being 70 DEG F.-120 DEG F. Two specific examples are given in which the coating material is an alkyd modified urea - formaldehyde resin. Moulded article mentioned are bottles, beakers, bottle caps, buttons, plates, electrical parts and toys.
GB3366/52A 1951-02-19 1952-02-08 Method of and apparatus for moulding polythene Expired GB702308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US702308XA 1951-02-19 1951-02-19

Publications (1)

Publication Number Publication Date
GB702308A true GB702308A (en) 1954-01-13

Family

ID=22094007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3366/52A Expired GB702308A (en) 1951-02-19 1952-02-08 Method of and apparatus for moulding polythene

Country Status (1)

Country Link
GB (1) GB702308A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164259A2 (en) * 1984-06-01 1985-12-11 Scott C. Holden Surface temperature control system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0164259A2 (en) * 1984-06-01 1985-12-11 Scott C. Holden Surface temperature control system
EP0164259A3 (en) * 1984-06-01 1987-12-16 Scott C. Holden Surface temperature control system

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