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GB1051576A - - Google Patents

Info

Publication number
GB1051576A
GB1051576A GB1051576DA GB1051576A GB 1051576 A GB1051576 A GB 1051576A GB 1051576D A GB1051576D A GB 1051576DA GB 1051576 A GB1051576 A GB 1051576A
Authority
GB
United Kingdom
Prior art keywords
film
temperature
width
polypropylene
reduced
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.)
Active
Application number
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.)
Publication of GB1051576A publication Critical patent/GB1051576A/en
Active 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
    • 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
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • 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

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

Abstract

1,051,576. Isotropic polypropylene films. KALLE A.G. Nov. 12, 1964 [Nov. 14, 1963], No. 46190/64. Heading B5B. Isotropic polypropylene film is made by extrusion of predominantly isotactic polypropylene at 190-325‹ C. from a slit-shaped nozzle, the extruded melt is quenched to a temperature below 90‹ C., the nozzle slit width being such that the film produced has a thickness of more than 0À3 mm., the film is heated to a temperature between the crystallite melting point of the polypropylene and a temperature 60‹ C. below the said melting point, the film is stretched at linear stretch ratios of up to 15 in two directions perpendicular to one another, stretching first being effected longitudinally and then transversely, the width (b) of the transversely stretched film is reduced by 10 to 35% to a width (c) at a temperature between the crystallite melting point of the polypropylene and a temperature not more than 10‹ C. below the transverse stretching temperature, and the film is then cooled to a temperature below 40‹ C. Preferably the polypropylene film used has a melt index of 3-15 g./10 mins. at 230‹ C. as determined by A.S.T.M. method D1238-57T, a reduced viscosity greater than 2, preferably between 3 and 4, as determined at 135‹ C. in 0À1% solution in cis-decahydro-naphthalene stabilized with 0À5% phenyl-naphthylamine, and a density of 0À90-0À91 g./c.c. at 20‹ C., especially 0À906. The width reduction step is preferably effected at 145-170‹ C., the width of the transversely stretched film being reduced by 20-35%. In an example, a longitudinally stretched film is transversely stretched and its width then reduced on a tenter frame having a zone with diverging clip chains followed by a zone with converging clip chains.
GB1051576D 1963-11-14 Active GB1051576A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK0051367 1963-11-14

Publications (1)

Publication Number Publication Date
GB1051576A true GB1051576A (en)

Family

ID=7225964

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1051576D Active GB1051576A (en) 1963-11-14

Country Status (7)

Country Link
AT (1) AT265624B (en)
BE (1) BE655645A (en)
CH (1) CH424214A (en)
DE (1) DE1504456A1 (en)
GB (1) GB1051576A (en)
LU (1) LU47330A1 (en)
NL (1) NL6412817A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5573723A (en) * 1990-10-02 1996-11-12 Hoechst Aktiengesellschaft Process for preparing biaxially oriented polypropylene film suitable for twist wrapping
US5766532A (en) * 1994-05-16 1998-06-16 Hoechst Ag Process for the production of a biaxially highly oriented polypropylene film

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1568964A (en) * 1975-11-05 1980-06-11 Nat Res Dev Oriented polymer materials
JPS60174629A (en) * 1984-02-20 1985-09-07 Mitsubishi Monsanto Chem Co Manufacture of biaxially oriented polyamide film

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5573723A (en) * 1990-10-02 1996-11-12 Hoechst Aktiengesellschaft Process for preparing biaxially oriented polypropylene film suitable for twist wrapping
US5766532A (en) * 1994-05-16 1998-06-16 Hoechst Ag Process for the production of a biaxially highly oriented polypropylene film

Also Published As

Publication number Publication date
LU47330A1 (en) 1966-05-11
CH424214A (en) 1966-11-15
BE655645A (en) 1965-05-12
AT265624B (en) 1968-10-25
DE1504456A1 (en) 1969-09-11
NL6412817A (en) 1965-05-17

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