A process for injection molded microcellular foaming various flexible foam compositions from biodegradable and industrially compostable bio-derived thermoplastic resins for use in, for example, footwear components, seating components, protective gear components, and watersport accessories wherein a process of manufacturing includes the steps of: producing a suitable thermoplastic biopolymer or biopolymer blend; injection molding the thermoplastic biopolymer or biopolymer blend into a suitable mold shape with inert nitrogen gas; controlling the polymer melt, pressure, temperature, and time such that a desirable flexible foam is formed; and utilizing gas counterpressure in the injection molding process to ensure the optimal foam structure with the least amount of cosmetic defects and little to no plastic skin on the outside of the foamed structure.

An injection molding machine includes an injection device including at least first and second injection units, and one mold clamping device. A molding material is injected into a first cavity space by the first injection unit, and a molding material is injected into a second cavity space by the second injection unit. The injection molding machine further includes a control device controlling the injection device and the mold clamping device, and a storage device storing a set time in advance. The control device starts injection of the second injection unit after elapse of the set time from a predetermined time point. The predetermined time point is a time point at which the first injection unit starts injection or an earlier time point. The set time is a delay time for delaying start of injection of the second injection unit from start of injection of the first injection unit.

An injection molding machine includes an injection device including at least first and second injection units, and one mold clamping device. A molding material is injected into a first cavity space by the first injection unit, and a molding material is injected into a second cavity space by the second injection unit. The injection molding machine further includes a control device controlling the injection device and the mold clamping device, and a storage device storing a set time in advance. The control device starts injection of the second injection unit after elapse of the set time from a predetermined time point. The predetermined time point is a time point at which the first injection unit starts injection or an earlier time point. The set time is a delay time for delaying start of injection of the second injection unit from start of injection of the first injection unit.

An injection molding device includes a first injection section, a second injection section, a mold mounting unit and a hot runner, where a posture in which a first plasticizing device and a first plunger are in fluid communication and a posture in which the first plunger and the hot runner are in fluid communication can be selected as a posture of a first distributor, a posture in which a second plasticizing device and a second plunger are in fluid communication and a posture in which the second plunger and the hot runner are in fluid communication can be selected as a posture of a second distributor, and the hot runner includes a first sprue runner, a second sprue runner, and a nozzle, the nozzle being in fluid communication with both sprue runners and can be in fluid communication with the mold (M).

A housing and a method for manufacturing the housing are provided. The housing includes a side wall having a plurality of holes and at least one reinforcing rib disposed on a surface of the side wall, wherein the holes are disposed on a side surface of the side wall, the at least one reinforcing rib extends along the edges of the holes, and the at least one reinforcing rib has a plurality of extending directions parallel to the surface, and the extending directions are different from each other. The side wall and the reinforcing rib are an integral structure, and the reinforcing rib does not cover the holes.

A housing and a method for manufacturing the housing are provided. The housing includes a side wall having a plurality of holes and at least one reinforcing rib disposed on a surface of the side wall, wherein the holes are disposed on a side surface of the side wall, the at least one reinforcing rib extends along the edges of the holes, and the at least one reinforcing rib has a plurality of extending directions parallel to the surface, and the extending directions are different from each other. The side wall and the reinforcing rib are an integral structure, and the reinforcing rib does not cover the holes.