Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1979-11-16
1983-11-15
Weston, Caleb
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
15624414, 15624418, 15624419, 15624427, 156267, B29D 2304, B32B 3118
Patent
active
044153929
ABSTRACT:
A method for producing a foamed plastic sheet which comprises heating and kneading a thermoplastic synthetic resin composition containing a blowing agent in an extruder, extruding the resulting gel through a circular die provided at the end of the extruder, and pinching the tubular foamed extrudate with a pair of pinch rolls while it is still in the softened state to adhere the inside wall of the foamed tubing to itself, is characterized in that said pinching and adhesion are performed by using a pair of pinch rolls having a width at least 5% smaller than the width of the tubular foamed extrudate extruded in the flattened state so that non-adhered parts are formed at both side end portions of the pinched foamed sheet in the widthwise direction and the inside of the non-adhered parts communicates with the open air.
REFERENCES:
patent: 3094449 (1963-06-01), Sisson
patent: 3159698 (1964-12-01), Suh et al.
patent: 3486196 (1969-12-01), Klenk et al.
patent: 3932569 (1976-01-01), Fuss
Japan Styrene Paper Corporation
Weston Caleb
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