A method for producing a molded part, in particular a component of a sporting good, includes providing a mixture of a polymer melt and a foaming agent and injecting the mixture into a mold. The method includes solidifying at least a first portion of the molded part without foaming and at least a second portion of the molded part after foaming inside the mold, wherein the mixture includes a polymer having an average molecular mass corresponding to a viscosity number 130 ml/g, preferably 170 ml/g, more preferably 190 ml/g and most preferably 225 ml/g, wherein the viscosity number is determined via solution viscometry according to the ISO 307 standard.

The present application provides a molding die and processing method of ETPU slippers; the die includes a movable die module and a fixed die module, wherein the movable die module includes a movable die base, a male die fixed on the movable die base and a movable inner support movably arranged in the male die; a first die cavity is formed in a side surface of the male die, a movement channel is formed in an inner bottom wall of the first die cavity, and the movable inner support is movably mounted in the movement channel; the fixed die module includes a fixed die base and a die frame fixed on the fixed die base, and a second die cavity is formed in a side surface of the die frame.

A mold is configured to form a polymeric article. The mold includes a first mold portion and a second mold portion. The polymeric article formed by the mold includes regions having varying densities. A method includes forming a cellular polymeric article having regions of varying densities between the first mold portion and the second mold portion.

Proposed is an apparatus and method for manufacturing automotive interior materials. The apparatus includes a first mold unit with a first molding surface and a gate disposed on the first molding surface, and a second mold unit provided with a second molding surface facing the first molding surface, wherein a skin is set on the first molding surface; and the first mold unit and the second mold unit are configured, when combined, to provide a volume-variable injection space between the set skin and the first molding surface, wherein the volume-variable injection space is in a first volume state while molten resin is injected through the gate, and after completing the injection of the molten resin, the volume-variable injection space changes to a second volume state that a volume of the injection space is reduced compared to the first volume state to compress the molten resin.

A molded foam manufacturing apparatus 1 includes a cylinder 2 in which a plasticization zone 21 where a thermoplastic resin is plasticized and melted, a starvation zone 22 where the molten resin is put into a starvation state and an injected physical foaming agent is dissolved in the molten resin, and a feeding zone 23 where the molten resin in which the physical foaming agent is dissolved is compressed and metered are provided in this order from an upstream side, and a screw 3 that is installed inside the cylinder 2 so as to be freely rotatable around an axis of the cylinder and has flights formed in a spiral shape on an outer circumference of a shaft 31, wherein a lead angle R of the flights of the screw 3 corresponding to the feeding zone 23 is set smaller than a lead angle of the flight corresponding to the starvation zone 22, and the number of pieces of the flight of the screw 3 corresponding to the feeding zone 23 is set smaller than the number of pieces of the flight corresponding to the starvation zone 22. In this way, it is possible to prevent a decrease in the flow rate of the molten resin transported in the starvation zone and the feeding sone and manufacture high-quality molded foams with high production efficiency.

The present disclosure relates to a process and article produced by injection molding. More particularly, a process and article produced by injection molding, that provides a part with one or more locations of a reduced density where such part competes in mechanical property characteristics with parts, such as vehicular components, otherwise produced from metallic materials, and which part offers thermal insulation, flame resistance and EMI shielding.