Title: Shrunken foamed thermoplastic resin sheet and its method of preparation

Abstract: A non-woven rug, or the like, is formed by heat sealing a covering material at spaced intervals to a plastic backing and thereafter shrinking the backing to bulk the facing fabric. The heat sealing of the facing fabric to the backing causes a partial loss of orientation in the seal area therein bringing about a bulking or crinkling of the backing. The backing is preferably of a thermoplastic material having a foaming agent incorporated therein which is foamed after the completion of the heat sealing and heat shrinking procedures. Also included in the disclosure are the features of the backing fabric independently, i.e., incorporation of a foaming agent into a plastic which is extruded and thereafter heat sealed and/or stretch oriented and shrunk prior to the activation of the foaming agent to foam the fabric.

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Inventors: Schirmer, Henry G. (Spartanburg, SC, US)

Application Number: 850752
Filing Date: 1977-11-11
Publication_date: 1979-03-27
Assignee: W. R. Grace & Co. (Duncan, SC)
Primary Class(es): 521/79 264/54, 264/230, 264/342R, 264/DIG8, 264/DIG18, 264/DIG47, 521/50.5, 521/143
Other Classes:
US Patent Ref:

3300366	Jan, 1967	Krolik	264/DIG.
3339006	Aug, 1967	Collins	264/321.
3403203	Sep, 1968	Schirmer	264/DIG.
3639199	Feb, 1972	Brandts et al.	156/85.
3755062	Aug, 1973	Schirmer	156/85.
3959051	May, 1976	Schirmer	156/85.

Other Refs:
Primary Examiner: Anderson, Philip
Assistant Examiner:
Attorney: Toney; John J., Lee, Jr.; William D., Hardaway; John B.