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Publication numberDE3124290 A1
Publication typeApplication
Application numberDE19813124290
Publication date13 May 1982
Filing date19 Jun 1981
Priority date20 Jun 1980
Also published asUS4405775
Publication number19813124290, 813124290, DE 3124290 A1, DE 3124290A1, DE-A1-3124290, DE19813124290, DE3124290 A1, DE3124290A1, DE813124290
InventorsFukashi Hashimoto
ApplicantMitsubishi Petrochemical Co
Export CitationBiBTeX, EndNote, RefMan
External Links: DPMA, Espacenet
Process for producing a biaxially oriented polypropylene film and film produced according to this process
DE 3124290 A1
The invention relates to the production of a biaxially oriented polypropylene film. The process comprises the melting and extrusion of polypropylene in web form, the cooling and solidification of a formed polypropylene film, the preheating thereof and the orientation in the longitudinal direction and also finally in the transverse direction. The special feature of the process according to the invention consists in the longitudinal orientation of the polypropylene film being carried out in an at least two-stage process. The biaxially oriented polypropylene film obtained in this manner has very good strength.
Description  available in
Claims  available in
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
DE1753827B2 *30 Aug 196820 Mar 1975Hoechst Ag, 6000 FrankfurtTitle not available
DE2328639A1 *6 Jun 19732 Jan 1975Barmag Barmer MaschfVerfahren und vorrichtung zur herstellung schrumpfarmer folienbaendchen
JPS345887B1 * Title not available
JPS469677B1 * Title not available
JPS4326110B1 * Title not available
JPS4918628B1 * Title not available
JPS5461269A * Title not available
JPS5466978A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
DE3635302A1 *17 Oct 198628 Apr 1988Hoechst AgProcess and apparatus for cooling a melt film extruded from a slot die into a cooling system
DE19622085C1 *31 May 199611 Dec 1997Brueckner MaschbauZumindest zweistufiges Verfahren zur Längsreckung von Kunststoffolien sowie danach hergestellte Kunststoffolie und zugehörige Vorrichtung
International ClassificationB29C55/06, B29C55/00, B29C49/00, B29C55/14
Cooperative ClassificationB29K2023/12, B29C55/143, B29C55/065
European ClassificationB29C55/06B, B29C55/14B
Legal Events
14 Oct 19828128New person/name/address of the agent
Representative=s name: FLACH, D., DIPL.-PHYS., 8200 ROSENHEIM ANDRAE, S.,
23 Jun 19838128New person/name/address of the agent
Representative=s name: KERN, R., DIPL.-ING. POPP, E., DIPL.-ING.DIPL.-WIR
16 Jun 19888110Request for examination paragraph 44
27 Apr 19898128New person/name/address of the agent
Representative=s name: POPP, E., DIPL.-ING.DIPL.-WIRTSCH.-ING.DR.RER.POL.
3 May 19898128New person/name/address of the agent
Representative=s name: POPP, E., DIPL.-ING.DIPL.-WIRTSCH.-ING.DR.RER.POL.
17 Jan 1991D2Grant after examination
20 Jun 19918363Opposition against the patent
9 Jun 19938339Ceased/non-payment of the annual fee