GB905310A - Process for improving the resistance of films of thermoplastic materials to impact stress - Google Patents

Process for improving the resistance of films of thermoplastic materials to impact stress

Info

Publication number
GB905310A
GB905310A GB496160A GB496160A GB905310A GB 905310 A GB905310 A GB 905310A GB 496160 A GB496160 A GB 496160A GB 496160 A GB496160 A GB 496160A GB 905310 A GB905310 A GB 905310A
Authority
GB
United Kingdom
Prior art keywords
film
polymers
melting point
heating
crystallite melting
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
GB496160A
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.)
Hoechst AG
Original Assignee
Hoechst AG
Farbwerke Hoechst AG
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 Hoechst AG, Farbwerke Hoechst AG filed Critical Hoechst AG
Publication of GB905310A publication Critical patent/GB905310A/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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/023—Half-products, e.g. films, plates
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • 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
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02—Thermal after-treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D7/00—Producing flat articles, e.g. films or sheets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The resistance to impact stress of an omnidirectionally stretched film of thermoplastic material of high molecular weight is enhanced by heating the film at a temperature 1 DEG -50 DEG C. below the crystallite melting point and/or softening point of the material, the film being allowed to shrink during the treatment to an extent dependent on the temperature used. Desirably, the temperature used is 2 DEG -20 DEG C. below the crystallite melting point. Specified materials include polyolefins, especially low-pressure polyethylene and polypropylene, fluorolefin polymers, e.g. polymers of tetrafluoroethylene or chlorotrifluoroethylene, polyamides, polyvinyl compounds, e.g. polyvinyl chloride and polyvinyldene chloride and polymers of acrylonitrile and of acrylic acid esters. Copolymers of the said monomers or blends of the polymers may also be used. The thickness of the film should not exceed 600m and is desirably 5-300m . Before heating, the film should preferably have been stretched to a ratio of 1:2,9-1:15,8, corresponding to 190-1480%. Heating may be carried out in a liquid bath, e.g. of glycol, for 1-40 seconds. Alternatively hot air or other gases, heated plates, radiant heat or induction heat may be used, but longer contact times are then necessary. Low pressure polyethylene, with a crystallite melting point of 125 DEG -127 DEG C., is most suitably heated at 115 DEG -120 DEG C. An omnidirectional stretching process is described in Specification 849,466. Specifications 799,392, 799,823, 801,031 and 819,867 also are referred to.
GB496160A 1959-02-11 1960-02-11 Process for improving the resistance of films of thermoplastic materials to impact stress Expired GB905310A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF27690A DE1207611B (en) 1959-02-11 1959-02-11 Process for the improvement of all-round stretched films made of thermoplastic materials against impact loads

Publications (1)

Publication Number Publication Date
GB905310A true GB905310A (en) 1962-09-05

Family

ID=7092558

Family Applications (1)

Application Number Title Priority Date Filing Date
GB496160A Expired GB905310A (en) 1959-02-11 1960-02-11 Process for improving the resistance of films of thermoplastic materials to impact stress

Country Status (4)

Country Link
CH (1) CH382430A (en)
DE (1) DE1207611B (en)
FR (1) FR1247795A (en)
GB (1) GB905310A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248463A (en) * 1962-02-15 1966-04-26 Phillips Petroleum Co Continuous production of biaxially oriented crystalline thermoplastic film

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1580697A (en) * 1976-10-27 1980-12-03 Leer Koninklijke Emballage Treatment of polymeric film laminates
GB1577128A (en) * 1976-10-27 1980-10-22 Leer Koninklijke Emballage Production of polymeric film laminates
GB2055855A (en) 1979-08-07 1981-03-11 Ici Ltd Heat-treating polyolefin films
NL9101876A (en) * 1991-11-11 1993-06-01 Dsm Nv PROCESS FOR MANUFACTURING A STEAM STERILIZABLE POROUS POLYOLINE FINEMANE AND 134 DEGREE CELSIUS STEAM STERILIZABLE POLYETHEENE MEMBRANE.
US5843358A (en) * 1992-11-12 1998-12-01 Dsm N.V. Process for producing a steam-sterilizable porous polyolefin membrane and polyethylene membrane steam-sterlizable at 134° C.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248463A (en) * 1962-02-15 1966-04-26 Phillips Petroleum Co Continuous production of biaxially oriented crystalline thermoplastic film

Also Published As

Publication number Publication date
DE1207611B (en) 1965-12-23
CH382430A (en) 1964-09-30
FR1247795A (en) 1960-12-02

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