GB857896A - Process for making oriented films - Google Patents

Process for making oriented films

Info

Publication number
GB857896A
GB857896A GB1112159A GB1112159A GB857896A GB 857896 A GB857896 A GB 857896A GB 1112159 A GB1112159 A GB 1112159A GB 1112159 A GB1112159 A GB 1112159A GB 857896 A GB857896 A GB 857896A
Authority
GB
United Kingdom
Prior art keywords
temperature
heat
setting
treatment
film
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
GB1112159A
Inventor
Cecil Louis Long
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
Priority to GB30882/58A priority Critical patent/GB839108A/en
Priority to BE571828D priority patent/BE571828A/xx
Priority to FR776222A priority patent/FR1224056A/en
Application filed by EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to GB1112159A priority patent/GB857896A/en
Priority to FR792034A priority patent/FR75752E/en
Publication of GB857896A publication Critical patent/GB857896A/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
    • 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

Abstract

Oriented films having balanced properties are made from unoriented films of polyethylene terephthalate or other orientable crystallisable linear organic polymer of the requisite high melting point by successively stretching the unoriented film laterally and longitudinally, in each case at a temperature from 70-120 DEG C., while preventing significant contraction in the other direction, subjecting the oriented film to a modifying treatment for a period of 0,01-5 mins. while maintaining tension in both directions so that the film remains substantially unaltered in dimensions, and heat setting-the resulting film at 150-230 DEG C. under conditions such that no substantial shrinkage occurs, the modifying treatment being carried out either (a) at a temperature of 100 DEG C. or more below the temperature in the subsequent heat-setting, or (b) at a temperature above 100 DEG C. and 10 DEG C. or more below the temperature in the subsequent heat-setting. In process (a), an additional modifying treatment or treatments may be interposed between the first modifying treatment and the heat-setting treatment, and the additional modifying treatment(s) may be effected at a temperature between that of the first modifying treatment and that of the heat-setting treatment. In process (b) the temperature of the modifying treatment may be 45-75 DEG C. below the temperature of the heat setting treatment The film may finally be heat-relaxed at 90-150 DEG C. while under slight tension, and a water-permeable colloid (e.g. aqueous gelatin) may be applied to the film, preferably before heat-relaxation. Specification 786,176 also is referred to.
GB1112159A 1957-10-11 1959-04-01 Process for making oriented films Expired GB857896A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB30882/58A GB839108A (en) 1957-10-11 1958-09-26 Process for making oriented films
BE571828D BE571828A (en) 1957-10-11 1958-10-07
FR776222A FR1224056A (en) 1957-10-11 1958-10-08 Process for manufacturing oriented films from polyesters
GB1112159A GB857896A (en) 1959-04-01 1959-04-01 Process for making oriented films
FR792034A FR75752E (en) 1957-10-11 1959-04-14 Process for manufacturing oriented films from polyesters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1112159A GB857896A (en) 1959-04-01 1959-04-01 Process for making oriented films

Publications (1)

Publication Number Publication Date
GB857896A true GB857896A (en) 1961-01-04

Family

ID=9980418

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1112159A Expired GB857896A (en) 1957-10-11 1959-04-01 Process for making oriented films

Country Status (1)

Country Link
GB (1) GB857896A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461199A (en) * 1966-05-03 1969-08-12 Du Pont Process for improving dimensional stability of tensilized polyester film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461199A (en) * 1966-05-03 1969-08-12 Du Pont Process for improving dimensional stability of tensilized polyester film

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