A method of sub-ambient pressure processing of blow-molded polymer foams and skin-over-foam sandwich panel configurations for lightweight components having improved structural properties. The method can create either skinned or un-skinned foams that offer smooth interior and exterior surfaces, zero or controlled surface porosity, skins of pre-defined thickness, and foam cells that are expanded and oriented normal to the material plane, effectively spherical or polyhedral in nature, and offering improved bending and compressive strength.

It is an object of the present invention to provide a foam molding resin containing LDPE capable of enhancing foaming magnification. According to the present invention, there is provided a foam molding resin containing low-density polyethylene, wherein the low-density polyethylene has a melt tension of 100 to 250 mN and a shear viscosity of 350 to 450 Pa.Math.s.

The invention relates to a method for determining at least one layer property of a layer to be determined, in particular a foam layer (16), in an extrusion process, where a supply material (7) is at least partially foamed and an extrusion product (2) with the foam layer (16) is put out, comprising at least the following steps: a) irradiating said extrusion product (2) using electro-magnetic radiation (S), b) electro-magnetically measuring at least one radiation (R) having travelled through said foam layer (16), c) measuring at least one feed-in rate or feed-in volume of the supply material (7), and d) determining the at least one material property of said layer (16) to be determined from the measured feed-in volume (z) and the electro-magnetic measurement.

A device for making foam pipes and a method for making the foam pipes includes the use of critical micro foaming injection molding. The foaming agent and the foaming material are mixed and controlled under specific temperature to obtain micro bubbles in the wall of the foam pipes which need less material when compared with PVC pipes of same specification such that manufacturing cost is reduced.

A flow path forming device is provided that includes: a first flow path forming member having a first flow path forming surface; and a second flow path forming member having a second flow path forming surface. The first flow path forming surface and the second flow path forming surface form a flow path through which a plastic composition flows. When a water droplet is deposited on a droplet deposition surface of each of the first flow path forming surface and the second flow path forming surface, and the droplet deposition surface on which the water droplet is deposited is tilted to measure a maximum droplet weight, an average value of the maximum droplet weight on the first flow path forming surface and the maximum droplet weight on the second flow path forming surface is 8 g or more and 25 g or less.

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 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 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.

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.