GB838954A - Thermoplastic film materials - Google Patents

Thermoplastic film materials

Info

Publication number
GB838954A
GB838954A GB32022/57A GB3202257A GB838954A GB 838954 A GB838954 A GB 838954A GB 32022/57 A GB32022/57 A GB 32022/57A GB 3202257 A GB3202257 A GB 3202257A GB 838954 A GB838954 A GB 838954A
Authority
GB
United Kingdom
Prior art keywords
polypropylene
bath
tubular film
extruded
extrusion
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
GB32022/57A
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.)
Montedison SpA
Original Assignee
Montedison SpA
Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA
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 Montedison SpA, Montecatini Societa Generale per lIndustria Mineraria e Chimica SpA filed Critical Montedison SpA
Publication of GB838954A publication Critical patent/GB838954A/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A tubular film is made by extrusion of an at least partially crystalline polypropylene. Polypropylene of molecular weight above 50,000 and of over 50% by weight crystalline content may be extruded at from 50-100 DEG C. above the softening point of the material, e.g. at about 250 DEG C. Cooling after extrusion may be effected in air, or in a bath of liquid at about 20 DEG C., and the tubular film is preferably led into the bath while the polypropylene is at a temperature such that it is still soft. The bath may contain a sizing or other modifying agent, e.g. an antistatic agent. In the preferred embodiment, polypropylene is extruded through an annular die and expanded by gaseous pressure, and then cooled in a liquid bath which acts as a seal to maintain the gaseous pressure in the tube, which may then be slit and collected as a nontubular film. The end of a portion of tubular film may be heat-sealed to form a bag.
GB32022/57A 1956-10-19 1957-10-14 Thermoplastic film materials Expired GB838954A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT838954X 1956-10-19

Publications (1)

Publication Number Publication Date
GB838954A true GB838954A (en) 1960-06-22

Family

ID=11323901

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32022/57A Expired GB838954A (en) 1956-10-19 1957-10-14 Thermoplastic film materials

Country Status (1)

Country Link
GB (1) GB838954A (en)

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