GB1073264A - A method for the high-speed extrusion of polypropylene - Google Patents

A method for the high-speed extrusion of polypropylene

Info

Publication number
GB1073264A
GB1073264A GB40044/65A GB4004465A GB1073264A GB 1073264 A GB1073264 A GB 1073264A GB 40044/65 A GB40044/65 A GB 40044/65A GB 4004465 A GB4004465 A GB 4004465A GB 1073264 A GB1073264 A GB 1073264A
Authority
GB
United Kingdom
Prior art keywords
shear rate
melt fracture
melt
polymer
extruded
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
GB40044/65A
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.)
JUN UI
Original Assignee
JUN UI
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 JUN UI filed Critical JUN UI
Priority to GB40044/65A priority Critical patent/GB1073264A/en
Publication of GB1073264A publication Critical patent/GB1073264A/en
Expired legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/08—Melt spinning methods
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene

Abstract

1,073,264. Melt spinning isotactic polypropylene. J. UI. Sept. 20, 1965, No. 40044/65. Heading B5B. Isotactic polypropylene is melt spun at a shear rate within the range extending from the shear rate at which the filaments formed no longer exhibit primary melt fracture to the shear rate at which they exhibit secondary melt fracture. When a high molecular weight polymer is melt spun at a shear rate exceeding a certain limit the filaments produced have a rough surface. This phenomenon is termed " primary melt fracture ". In the case of isotactic polypropylene, if the polymer is extruded at a shear rate much above that at which " primary melt fracture " first occurs and at a temperature which exceeds the melting point of the polymer but is lower than the melt spinning temperature normally employed, e.g. below 200‹ C., the extrudate no longer exhibits melt fracture. Further increase in the shear rate of extrusion however results in the extrudate again exhibiting melt fracture. This subsequently occurring melt fracture is termed " secondary melt fracture ". The polymer may be extruded at a temperature which is above but not more than 50‹ C. above its melting point. The polymer may be extruded at a shear rate in the range of 1 x 10<SP>2</SP> to 1 x 10<SP>4</SP> see. It may be extruded through a nozzle or nozzles having a diameter of 0À5 to 2À0 mm., a length more than five times the diameter and an inlet duct in the form of a truncated cone the apical angle of which may be zero.
GB40044/65A 1965-09-20 1965-09-20 A method for the high-speed extrusion of polypropylene Expired GB1073264A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB40044/65A GB1073264A (en) 1965-09-20 1965-09-20 A method for the high-speed extrusion of polypropylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB40044/65A GB1073264A (en) 1965-09-20 1965-09-20 A method for the high-speed extrusion of polypropylene

Publications (1)

Publication Number Publication Date
GB1073264A true GB1073264A (en) 1967-06-21

Family

ID=10412892

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40044/65A Expired GB1073264A (en) 1965-09-20 1965-09-20 A method for the high-speed extrusion of polypropylene

Country Status (1)

Country Link
GB (1) GB1073264A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115175A1 (en) * 2015-07-09 2017-01-11 Keiryo Packaging SA A method for manufacturing a polymer article

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3115175A1 (en) * 2015-07-09 2017-01-11 Keiryo Packaging SA A method for manufacturing a polymer article

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