Process for preparing a foamed article of thermoplastic resin an

Details Process for preparing a foamed article of thermoplastic resin an Process for preparing a foamed article of thermoplastic resin an

1978-09-11

1980-09-09

Ball, Michael W.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156167, 156498, 156500, 264 455, 264 461, 264 51, 264171, 425325, 425464, 425378R, 425382R, 425817C, B29D 2700, B32B 520

Patent

active

042216214

ABSTRACT:
A process and die are disclosed for preparing a foamed article of thermoplastic resin having a particular cross section configuration. The die of the invention is provided with a plurality of apertures in its face through which the resin is discharged. The apertures in the face of the die are distributed in a shape corresponding to the cross section of the foamed article which is produced. The apertures are further divided into a plurality of groups in which there is at least one zone which is void of apertures so that the apertures in the same group are actually restricted to a narrow band. The zone on the surface of the die which is void of apertures has a thickness more than twice the average distance between two adjacent apertures belonging to the same group.

REFERENCES:
patent: 3720572 (1973-03-01), Soda et al.
patent: 3936518 (1976-02-01), Soda et al.
patent: 3993721 (1976-11-01), Soda et al.

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