A heat-insulating housing (21) includes: a wall body; and an open-cell resin body (4) of thermosetting resin with which a heat-insulating space formed by the wall body is filled by integral foaming, the open-cell resin body including: a plurality of cells (47); a cell film portion (42); a cell skeleton portion (43); a first through-hole (44) formed so as to extend through the cell film portion; and a second through-hole (45) formed so as to extend through the cell skeleton portion, wherein the plurality of cells communicate with one another through the first through-hole and the second through-hole.

A method of forming upholstery of a foam seat element including the steps of: inserting, into an injection mold, a plastic film delimiting at least one first foam injection area; injecting foam to form the upholstery in one piece, the film disappearing with the polymerization of the foam.

A foam part (5, 105, 205, 305), in particular for a vehicle seat, includes a first foam layer (11, 111, 211, 311) facing a user and a second foam layer (21, 221) facing away from the user. The first foam layer has a hardness and/or density that is different from the hardness or density of the second foam layer (21, 221). The first foam layer includes several comfort tubes (50, 150, 250, 350) facing the user. A method for producing such a foam part (5, 105, 205, 305) includes a first step in which the first foam layer, having the comfort tubes (50, 150, 250, 350), is foamed and a second step in which the second foam layer (21, 221) is foamed. A tool (500) for producing a foam part (5, 105, 205, 305) includes a bottom part (510), a frame (520), and a top part (530).

An injection molding method is provided. A molding device is provided and includes a first mold, a second mold over the first mold and a mold cavity defined by the first mold and the second mold. A first mixture is injected into the mold cavity through a first feeding port. A first component is formed from the first mixture. A second mixture is injected into the mold cavity through a second feeding port. A second component is formed from the second mixture. The second component is at least partially contact with the first component, and the first component and the second component have different physical properties.

There is provided a molded body including a main portion and a bank portion each of which is formed by foaming and molding a foam material. The main portion is made of urethane material which is softer than the material for the bank portion. At a boundary portion between the main and bank portions, the main portion is formed in a continuous interlocking profile and the bank portion is also formed in another continuous interlocking profile. The interlocking profile and the another interlocking profile are mated to each other so as to prevent separation between the main portion and the bank portion in a direction of an arrow (vehicle width direction). The boundary portion is provided by partitioning the cavity in a single mold with a weir, introducing different foam materials into both sides of the weir and foaming the introduced materials.