JPS57212023A - Production of inflated film - Google Patents

Production of inflated film

Info

Publication number
JPS57212023A
JPS57212023A JP56098683A JP9868381A JPS57212023A JP S57212023 A JPS57212023 A JP S57212023A JP 56098683 A JP56098683 A JP 56098683A JP 9868381 A JP9868381 A JP 9868381A JP S57212023 A JPS57212023 A JP S57212023A
Authority
JP
Japan
Prior art keywords
copolymer
film
10min
gamma
melt flow
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
JP56098683A
Other languages
Japanese (ja)
Inventor
Kazuhiro Fujiwara
Yoshinobu Furubayashi
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.)
Mitsubishi Petrochemical Co Ltd
Original Assignee
Mitsubishi Petrochemical Co 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 Mitsubishi Petrochemical Co Ltd filed Critical Mitsubishi Petrochemical Co Ltd
Priority to JP56098683A priority Critical patent/JPS57212023A/en
Publication of JPS57212023A publication Critical patent/JPS57212023A/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

Landscapes

  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

PURPOSE:To produce a film excellent in transparency, impact resistance and appearance, by extruding a specified propylene copolymer at a shear rate within a predetermined range. CONSTITUTION:A propylene copolymer having a melt flow rate of 12g/10min or lower, a density of 0.902g/cm<3> or lower and a Barus effect of 1.30 or less is melted by heating, and is extruded through an annular die having an appropriate gap at a shear rate gamma satisfying the condition represented by the expression, [wherein gamma=6(Q)/(wt<2>), Q is extrusion volume (cm<3>/sec), W is the circumference (cm) of the annular die, t is the gap (cm) of the die, MFR is the melt flow rate (g/10min) of the copolymer, and ME is the Barus effect of the copolymer.] A tubular film thus obtained is inflated to a predetermined extent by applying an air or N2 gas pressure to the inside of the film, then it is cooled by blowing air and is flattened.
JP56098683A 1981-06-25 1981-06-25 Production of inflated film Pending JPS57212023A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56098683A JPS57212023A (en) 1981-06-25 1981-06-25 Production of inflated film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56098683A JPS57212023A (en) 1981-06-25 1981-06-25 Production of inflated film

Publications (1)

Publication Number Publication Date
JPS57212023A true JPS57212023A (en) 1982-12-27

Family

ID=14226301

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56098683A Pending JPS57212023A (en) 1981-06-25 1981-06-25 Production of inflated film

Country Status (1)

Country Link
JP (1) JPS57212023A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832610A (en) * 1981-08-22 1983-02-25 Showa Denko Kk Preparation of propylene copolymer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5832610A (en) * 1981-08-22 1983-02-25 Showa Denko Kk Preparation of propylene copolymer
JPH0142285B2 (en) * 1981-08-22 1989-09-12 Showa Denko Kk

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