Sekisui Kaseihin Kogyo Kabushiki Kaisha

Sekisui Plastics

Shigetoshi Tanaka

Motoshige Hayashi

Motokazu Yoshii

Yoshikazu Kobayashi

Tsuneo Doi

Shigenari Soda

Kodo Masui

Expandable phenolic resin-coated composite beads comprise an aggregate having coated thereon a solid, expandable resin composition comprising a solid, phenolic resin initial condensation product, a foaming agent and, if necessary, a hardening agent. The expandable phenolic resin-coated composite beads provide composite cellular moldings in which the aggregates are uniformly dispersed in a phenolic resin-expanded layer and are firmly adhered to the expanded layer. The composite cellular moldings can be adhered to a face plate to form integral laminates.

Expandable phenolic resin-coated composite beads, a process for

A method and apparatus for preparing a substantially uniform thermoplastic foam extruded from an extruder, the molten thermoplastic resin having uniformly distributed therein a foaming agent. A cooling-mixer continuously receives the extruded mass of resin and foaming agent from the extruder and intimately mixes and substantially cools the mass. A substantially adiabatic zigzag mixer is connected to the cooling-mixer and divides the mass into a plurality of separate streams which are at least partially separated and recombined. A die is connected to the zigzag mixer and extrudes the uniformly cooled mass into a lower pressure zone to produce a substantially uniform thermoplastic foam.

Method and apparatus for preparing thermoplastic resin foam

An improved process for preparing foamed articles of thermoplastic resin having a hard, mar-resistant surface that is flat and smooth and resembles natural wood, and an extrusion die therefor. In the process a softened thermoplastic is extruded through apertures of the extrusion die of the invention which is a fiered die having a resin discharge plate having a peripheral recessing portion and a protruding interior portion which are formed on the resin discharge plate by one or more step-ups. Each of the peripheral and interior portions of the resin discharge plate is provided with a plurality of apertures, the aperture density of the peripheral portion being greater than that of the interior portion. A longitudinally extending cooling frame is mounted adjacent the resin discharge plate and extends in the direction of extrusion to at least the forward face of the interior portion of the plate. The cooling frame together with the interior portion of the resin discharge plate form a restrictive contact zone into which foamable resin members from the recessing portion are extruded. These members are thereafter coalesced with resin members extruded from the interior portion of the plate. The process is particularly suitable for preparing simulated wood articles.

Method of forming a foamed article having a simulated wood grained

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Nara, Japan

Shigetoshi Tanaka