JPS57210827A - Manufacture of plastic sheet - Google Patents

Manufacture of plastic sheet

Info

Publication number
JPS57210827A
JPS57210827A JP9520881A JP9520881A JPS57210827A JP S57210827 A JPS57210827 A JP S57210827A JP 9520881 A JP9520881 A JP 9520881A JP 9520881 A JP9520881 A JP 9520881A JP S57210827 A JPS57210827 A JP S57210827A
Authority
JP
Japan
Prior art keywords
stretching
amorphous part
plastic sheet
elasticity
linear expansion
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
JP9520881A
Other languages
Japanese (ja)
Inventor
Koichi Nakagawa
Takao Kimura
Osamu Maeda
Shinzo Yamakawa
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP9520881A priority Critical patent/JPS57210827A/en
Publication of JPS57210827A publication Critical patent/JPS57210827A/en
Pending 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

Landscapes

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

Abstract

PURPOSE:To accomplish manufacture of a plastic sheet having a small coefficient of linear expansion and high modulus of elasticity for a printing substrate, by heating and stretching it by a dielectric heating roll of a specified frequency, softening its amorphous part, exerting a stretching stress only on its amorphous part and stretching it at a high ratio. CONSTITUTION:A plastic sheet of a small coefficient of linear expansion and high modulus of elasticity is wanted for an insulating layer for a printed board. Because a crystalline part of a plastic sheet material is heated as well as its amorphous part by an ordinary working of biaxial stretching and strength of the crystalline part is lowered, highly oriented crystallization is limited. By heating only the amorphous part with a use of dielectric heating of a specified high frequency and rolling, stretching it at a softening temperature below a melting point in order to overcome a limit, the crystalline part is less heated than the amorphous part, strength is preserved and stretching stress is more exerted on the amorphous part, after all a biaxially stretched film of high ratio is obtained. According to an example of a 0.2mm. thick high density polyethylene product a linear expansion coefficient of an unstretched sheet is varied from 2X10<-4> deg.C<-1> to 1X10<-5> deg.C<-1>, a tensile modulus of elasticity from 50kg/mm.<2> to 500kg/mm.<2>.
JP9520881A 1981-06-22 1981-06-22 Manufacture of plastic sheet Pending JPS57210827A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9520881A JPS57210827A (en) 1981-06-22 1981-06-22 Manufacture of plastic sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9520881A JPS57210827A (en) 1981-06-22 1981-06-22 Manufacture of plastic sheet

Publications (1)

Publication Number Publication Date
JPS57210827A true JPS57210827A (en) 1982-12-24

Family

ID=14131325

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9520881A Pending JPS57210827A (en) 1981-06-22 1981-06-22 Manufacture of plastic sheet

Country Status (1)

Country Link
JP (1) JPS57210827A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118432A (en) * 1982-12-24 1984-07-09 Yamato Kagaku Kogyo Kk Synthetic resin film band free from thermal expansion and production thereof
JPH0424329U (en) * 1990-06-21 1992-02-27

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59118432A (en) * 1982-12-24 1984-07-09 Yamato Kagaku Kogyo Kk Synthetic resin film band free from thermal expansion and production thereof
JPH0333501B2 (en) * 1982-12-24 1991-05-17 Yamato Chemical Ind
JPH0424329U (en) * 1990-06-21 1992-02-27

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