GB915694A - Polypropylene film manufacture - Google Patents

Polypropylene film manufacture

Info

Publication number
GB915694A
GB915694A GB1959060A GB1959060A GB915694A GB 915694 A GB915694 A GB 915694A GB 1959060 A GB1959060 A GB 1959060A GB 1959060 A GB1959060 A GB 1959060A GB 915694 A GB915694 A GB 915694A
Authority
GB
United Kingdom
Prior art keywords
film
allowed
cool
polypropylene film
stretching
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
GB1959060A
Inventor
Rex Percival Palmer
Denis James Henry Sandiford
Annette La Touche Turner-Jones
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB1959060A priority Critical patent/GB915694A/en
Publication of GB915694A publication Critical patent/GB915694A/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
    • B29C55/02—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
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

Polypropylene film is biaxially oriented by a sequential stretching process in which a first stretch is carried out at 155 DEG -168 DEG C., and either the film is not allowed to cool below 130 DEG C. and is then stretched transversely to the first stretch at 155 DEG -168 DEG C. or, if the film is allowed to cool below 130 DEG C., it is stretched transversely at 160 DEG -168 DEG C. if the second stretch ratio is lower than the first, or at 163 DEG -168 DEG C. if the second stretch ratio is greater than or equal to the first stretching ratio. The film may be made by melt extrusion, preferably at above 214 DEG C., followed by quenching. Preferably, the film is not allowed to cool to below 140 DEG C. between the stretching steps and is stretched in both steps at 155 DEG -168 DEG C. Especially, the film is not allowed to cool to below 155 DEG C. Stretching may be so carried out as to produce a balanced biaxially oriented polypropylene film. Specifications 840,191 and 873,220 are referred to.
GB1959060A 1960-06-02 1960-06-02 Polypropylene film manufacture Expired GB915694A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1959060A GB915694A (en) 1960-06-02 1960-06-02 Polypropylene film manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1959060A GB915694A (en) 1960-06-02 1960-06-02 Polypropylene film manufacture

Publications (1)

Publication Number Publication Date
GB915694A true GB915694A (en) 1963-01-16

Family

ID=10131919

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1959060A Expired GB915694A (en) 1960-06-02 1960-06-02 Polypropylene film manufacture

Country Status (1)

Country Link
GB (1) GB915694A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324218A (en) * 1963-09-28 1967-06-06 Kalle Ag Process for the manufacture of polypropylene films
US3723438A (en) * 1970-07-13 1973-03-27 Fmc Corp Web stretching method
US4405775A (en) * 1980-06-20 1983-09-20 Mitsubishi Petrochemical Company Limited Biaxially oriented polypropylene film and method for its production
CN114103078A (en) * 2021-10-20 2022-03-01 湖北龙辰科技股份有限公司 High-strength polypropylene film and preparation method and application thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3324218A (en) * 1963-09-28 1967-06-06 Kalle Ag Process for the manufacture of polypropylene films
US3723438A (en) * 1970-07-13 1973-03-27 Fmc Corp Web stretching method
US4405775A (en) * 1980-06-20 1983-09-20 Mitsubishi Petrochemical Company Limited Biaxially oriented polypropylene film and method for its production
CN114103078A (en) * 2021-10-20 2022-03-01 湖北龙辰科技股份有限公司 High-strength polypropylene film and preparation method and application thereof
CN114103078B (en) * 2021-10-20 2022-08-09 湖北龙辰科技股份有限公司 High-strength polypropylene film and preparation method and application thereof

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