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Primary Examiner: Anderson, Philip
Assistant Examiner:
Attorney: Pierce, Scheffler & Parker

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Title: Packing material that can be shaped under the effect of heat

Abstract: A foamed plastic material of polyethylene or polystyrene capable of being heat-shaped for use in making packing containers wherein by stretching of the foam the cells therein are given a lenticular or elongated structure. In the case of a lenticular cell structure, produced by a bi-axial stretching operation, the individual cells are situated in layers in parallel planes. In the case of an elongated cell structure, produced by a mono-axial stretching operation, the individual cells are situated with their longitudinal axes in parallel planes.

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Other info:

Inventors: Ernstsson, Georg E. (Staffanstorp, SW)
Nilsson, Birger N. (Arlov, SW)
Pupp, Herwig (Lund, SW)
Stark, Olof S. (Rydsgard, SW)

Application Number: 479568
Filing Date: 1974-06-14
Publication_date: 1977-08-02
Assignee: AB Ziristor (Lund, SW)
Primary Class(es): 156/69 156/85, 156/218, 156/229, 215/371, 215/400, 264/45.9, 264/209.5, 264/210.1, 264/230, 264/289.6, 264/321, 264/DIG71, 428/913
Other Classes:
US Patent Ref:

439451	Oct, 1890	Ward	264/230.
2438901	Apr, 1948	Coxe	264/DIG.
2885105	May, 1959	Heyl et al.	264/DIG.
3039911	Jun, 1962	Fox	264/321.
3094449	Jun, 1963	Sisson	264/53.
3194864	Jul, 1965	Richie	264/53.
3220902	Nov, 1965	Edwards	264/321.
3248462	Apr, 1966	Merrill et al.	264/53.
3255877	Jun, 1966	Kracht et al.	264/321.
3384531	May, 1968	Parrish	265/53.
3391051	Jul, 1968	Ehrenfreund et al.	264/53.
3396062	Aug, 1968	White	264/321.
3400810	Sep, 1968	Makowski	264/321.
3458248	Jul, 1969	Eversole	264/321.
3611669	Oct, 1971	Shepherd	264/321.
3733381	May, 1973	Willette et al.	264/321.
3734273	May, 1973	Watanabe	156/86.
3767496	Oct, 1973	Amberg et al.	264/342.
3933959	Jan, 1976	Skochdopole et al.	264/45.
3967991	Jul, 1976	Shimano et al.	264/DIG.
3970492	Jul, 1976	Amberg et al.	156/85.

Other Refs: 36-8319954,069

Dec, 1963	JA
Apr, 1964	UK

Other References: Benning, Calvin J., "Plastic Foams: The Physics and Chemistry of Product Performance and Process Technology," vol. 1, New York, Wiley, Interscience, c. 1969, pp. 54-61.