The invention relates to multi-layer articles consisting of at least one layer of a foamed fluoropolymer. The article is formed by co-extrusion in which the foamed layer is coextruded as a foam, and not foamed in a secondary process. Preferably the fluoropolymer foam is a polyvinylidene fluoride (PVDF), such as KYNAR PVDF from Arkema Inc. The article could be sized into a specific shape during the manufacturing process. Useful multi-layer articles of the invention include pipe, tube, sheet, profile, film, jacketing or any other multilayer foam-core articles are especially useful.

An anisotropic multilayer film comprising one or more foam layers is described herein.

In outer shape processing of a resin expanded sheet having a resin expanded layer including a polyamide-based resin composition, the outer shape processing is carried out while allowing a specified amount or more of moisture to be contained in the resin expanded layer.

In one embodiment, a method of forming an extruded board includes mixing a resin and a foaming agent, melting the mixed resin and foaming agent to form a uniformly colored extrudate, differentially expanding voids formed from the foaming agent within the uniformly colored extrudate by passing the uniformly colored extrudate through a breaker plate, forming a board with the differentially expanded voids and uniformly colored extrudate, and forming lightened portions on an outermost surface of the formed board.

An apparatus for the in-situ formation of a moulding. The apparatus includes a forming head and a forming blade. The forming head has a body having a raw material receiver. The body further has one or more outlets to permit the movement of raw material from the raw material receiver through an outer surface of the body and into an area adjacent to a work surface when the forming head is positioned in proximity to the work surface. The forming blade is secured to the body and imparts a desired profile shape to raw material deposited adjacent to the work surface as the forming head is moved along the work surface.

In one embodiment, a method of forming an extruded board includes mixing a resin and a foaming agent, melting the mixed resin and foaming agent to form a uniformly colored extrudate, differentially expanding voids formed from the foaming agent within the uniformly colored extrudate by passing the uniformly colored extrudate through a breaker plate, forming a board with the differentially expanded voids and uniformly colored extrudate, and forming lightened portions on an outermost surface of the formed board.

A method for producing a polypropylene-based resin foamed molded article by blow molding a foamed parison formed of a base resin, in which: the base resin contains, in specific mixing proportions, a branched polypropylene-based resin (A), a linear polypropylene-based resin (B) and a recovered raw material (C) that is recovered in the course of production of the polypropylene-based resin foamed molded article. Each of the resin (A), resin (B) and the recovered raw material (C), has a specific range of a melt tension and a melt flow rate. A difference in melting point between the resin (A) and resin (B) is within a specific range. A difference in crystallization temperature between the resin (A) and resin (B) is within a specific range.

A push-in earplug including an elongate core and outer layer is disclosed. The outer layer includes a sound attenuating portion having a first average density and a stem portion having a second average density, and the second average density is greater than the first average density.

A composite article comprises an article presenting a surface and a thermally expandable composition disposed on the surface of the article. The thermally expandable composition comprises (a) from about 35 to about 65 percent by weight of a polyolefin resin; (b) from about 2 to about 15 percent by weight of a thermoplastic resin; (c) from about 1 to about 6 percent by weight of a curing agent suitable for cross-linking the polyolefin resin (a); (d) from about 15 to about 45 percent by weight of filler; and (e) from about 1 to about 10 percent by weight of a chemical blowing agent which is activated at an activation temperature, each based on the total weight of the thermally expandable composition. Methods of preparing and using the composite article, and an assembly formed from the composite article, are also disclosed.

The present invention relates to a method for producing a biodegradable resin expanded sheet, by which a biodegradable resin expanded sheet immediately after extrusion is brought into a predetermined cooled state in an extrusion expansion method, whereby good formability can be exerted.