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JPS57160615A - Shrinkable polyvinylalcohol film and manufacture thereof - Google Patents

Shrinkable polyvinylalcohol film and manufacture thereof

Info

Publication number
JPS57160615A
JPS57160615A JP4776281A JP4776281A JPS57160615A JP S57160615 A JPS57160615 A JP S57160615A JP 4776281 A JP4776281 A JP 4776281A JP 4776281 A JP4776281 A JP 4776281A JP S57160615 A JPS57160615 A JP S57160615A
Authority
JP
Japan
Prior art keywords
film
stretching machine
water
polyvinylalcohol
longitudinal
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.)
Pending
Application number
JP4776281A
Other languages
Japanese (ja)
Inventor
Junkichi Watanabe
Satoru Shimizu
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.)
Unitika Ltd
Original Assignee
Unitika 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 Unitika Ltd filed Critical Unitika Ltd
Priority to JP4776281A priority Critical patent/JPS57160615A/en
Publication of JPS57160615A publication Critical patent/JPS57160615A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To obtain packaging material which is shrinkable at an ordinary temperature, by forming polyvinylalcohol film under biaxial stretch so as a shrinking ratio becomes more than 20% in both longitudinal and lateral directions when being immersed in water of an ordinary temperature. CONSTITUTION:Unstretched flat film of perfectly saponified polyvinylalcohol of >=98mol% degree of saponification which is formed to a film by a wet process, casting method or water-containing extrusion method is dried. Then, after said unstretched polyvinylalcohol film of 5-25% water content is biaxially stretched to an areal stretch ratio more than 300% at a film temperature below 130 deg.C by a tenter-type simultaneous biaxial stretching machine or a two-step biaxial stretching machine composed of a roll-type longitudinal stretching machine and a tenter-type lateral stretching machine, the film having shrinking ratio more than 20% in both longitudinal and lateral directions in water at an ordinary temperature is formed by stress-relaxation at a film temperature below 130 deg.C, then winding.
JP4776281A 1981-03-30 1981-03-30 Shrinkable polyvinylalcohol film and manufacture thereof Pending JPS57160615A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4776281A JPS57160615A (en) 1981-03-30 1981-03-30 Shrinkable polyvinylalcohol film and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4776281A JPS57160615A (en) 1981-03-30 1981-03-30 Shrinkable polyvinylalcohol film and manufacture thereof

Publications (1)

Publication Number Publication Date
JPS57160615A true JPS57160615A (en) 1982-10-04

Family

ID=12784376

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4776281A Pending JPS57160615A (en) 1981-03-30 1981-03-30 Shrinkable polyvinylalcohol film and manufacture thereof

Country Status (1)

Country Link
JP (1) JPS57160615A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112903A (en) * 1989-07-04 1992-05-12 Sanyo Chemical Industries, Ltd. Articles molded from moisture shrinkable resins

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5112903A (en) * 1989-07-04 1992-05-12 Sanyo Chemical Industries, Ltd. Articles molded from moisture shrinkable resins

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