Process of making a perforated film

Details Process of making a perforated film Process of making a perforated film

1988-12-20

1990-03-27

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Forming continuous work followed by cutting

264156, 264167, 2642095, 2642888, 264DIG70, 264DIG81, 383 8, 383 12, 383 17, 383 24, 383103, 383117, 428 355, 428 369, B29C 4700, B65D 3301, B65D 3302, B65D 3310

Patent

active

049118722

ABSTRACT:
This invention relates to a process for making a tubular structure formed by a film of extruded synthetic matter whose walls are at least partially perforated, including the steps of extruding from an annular die a tubular film having gaps or voids obtained in manner known per se by teeth which temporarily obturate the outlet of said die, and extruding and forming the film on leaving the die after flow of matter in the plastic state, upstream of the die, in a ring-shaped passage of which the outlet constitutes the die, this passage being of constant thickness equal to the width of the extrusion slot and consequently to the final thickness of the film, the flow of plastic material in this ring-shaped passage causing an effect of lamination of the matter ensuring dimensional stability, particularly the thickness of the film obtained at the outlet of the die, and in particular avoiding the formation of excess thickness or surface roughness on the film thus extruded. The invention also relates to a device for carrying out this process.

REFERENCES:
patent: 3225386 (1965-12-01), Newman
patent: 3252181 (1966-05-01), Hureau
patent: 3756300 (1973-09-01), Nalle, Jr.
patent: 3917889 (1975-11-01), Gaffney et al.
patent: 4038008 (1977-07-01), Larsen
patent: 4165832 (1979-08-01), Kuklies et al.
patent: 4346834 (1982-08-01), Mazumdar
patent: 4367841 (1983-01-01), Mazumdar
patent: 4610028 (1986-09-01), Nattrass
patent: 4636162 (1987-01-01), Pavy et al.

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