Plastic and nonmetallic article shaping or treating: processes – With severing – removing material from preform mechanically,... – Forming continuous work followed by cutting
Patent
1996-05-02
1998-02-10
Tentoni, Leo B.
Plastic and nonmetallic article shaping or treating: processes
With severing, removing material from preform mechanically,...
Forming continuous work followed by cutting
26417319, 2642106, 2642902, B29C 4706, B29C 4716, B29C 5514
Patent
active
057165700
ABSTRACT:
A process for the production of biaxially oriented polypropylene films which include at least one layer is described, in which a propylene polymer B is heated in an extruder and the melt of the propylene polymer B is extruded through a flat sheet die and the melt emerging from the flat sheet die is taken off on one or more rolls and is solidified to give a prefilm and this prefilm is stretched in the longitudinal and transverse direction. A propylene polymer or a propylene polymer mixture A is heated and melted in a second extruder and the melt of the propylene polymer or of the propylene polymer mixture A is fed to the two sides of the propylene polymer melt B so that both melts are extruded together and simultaneously through the flat sheet die. The propylene polymer or the propylene polymer mixture A forms the edge region of the film during the production process, and the edge regions including the propylene polymer or the propylene polymer mixture A are cut off after the longitudinal and transverse stretching of the film.
REFERENCES:
patent: 4348346 (1982-09-01), Thompson
patent: 4521359 (1985-06-01), Tsien
patent: 4975329 (1990-12-01), Bothe et al.
patent: 5252389 (1993-10-01), Schmidt et al.
Busch Detlef
Kochem Karl-Heinz
Peiffer Herbert
Schlogl Gunter
Schmidt Robert
Hoechst Aktiengesellschaft
Tentoni Leo B.
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