Title: Method for producing sheet material

Abstract: A method for making a continuous bilaminar planar sheet material utilized for packaging of goods and having raised pockets containing a gas. The sheet material is made by extruding a molten plastic through an extruder having a cylindrical nozzle with an annular circular slot opening, so that a tubular hollow element is formed. A plurality of heating elements are arranged around the circumference of the annular circular slot to maintain the temperature of the extruded material at different temperatures around the circumference of the annular slot.

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Inventors: Gaffney, William (New York, NY, US)

Application Number: 849597
Filing Date: 1977-11-08
Publication_date: 1980-01-22
Assignee: Mintz; Charlotte (New York, NY)
Primary Class(es): 156/145 156/244.14, 156/244.15, 156/244.25, 156/285, 156/290, 156/292, 156/497, 156/500, 156/553
Other Classes:
US Patent Ref:

3011930	Dec, 1961	Dworak	156/145.
3142599	Jul, 1964	Chavannes	156/292.
3655486	Apr, 1972	Hagino et al.	156/285.
3684614	Aug, 1972	Lemelson	156/285.
3703430	Nov, 1972	Rich	156/553.
3751537	Aug, 1973	Scotto et al.	264/209.
3954368	May, 1976	Kawakami	425/326.

Other Refs: 2195188

Jan, 1974	FR

Primary Examiner: Weston, Caleb
Assistant Examiner:
Attorney: Kirschstein, Kirschstein, Ottinger & Cobrin