Abstract: A process for manufacturing a multilayered object by molding having the steps of placing a lining sheet in a mould, injecting a thermoplastic resin material beneath the lining sheet, distributing the thermoplastic resin material beneath the lining sheet to form at least one thermoplastic resin based inner layer by creating a reserve of the thermoplastic resin material in a peripheral portion of the object, holding the extending portion of the sheet in place on the mold during the step of injecting and after the step of injecting so as to retain peripheral tightness of the thermoplastic resin material on a sliding holding point on the punch during movement of the die, pressing the extending portion of the lining sheet against the mold, and sandwiching the reserve in a liquid state between the lining sheet and a portion of the mold until the injected resin material sets to thereby form the multilayered object.

Abstract: A process for manufacturing a panel of material, intended, in particular, for forming an element of internal trim for a vehicle body, such as, for example, a door panel, including at least one layer (1), in particular of thermoplastic material, constituting a core, provided with an internal face (2) and an external face (3), therefor:The core layer (1) is moulded between two dies (8, 9), with additional thicknesses (10) being provided locally, these being suitable for constituting reinforcing ribs (4) formed from the mass of the panel.Gas is injected axially under pressure into the said additional thicknesses (10) in order to push the material of the said core layer (1) in such a way as to form tubular box girders 5.The material pushed at the time of injecting the gas is diverted.From the mass of the panel, at least one protuberance (7) is formed with the laterally diverted material.

Abstract: A process for manufacturing a multilayered object by molding having the steps of positioning a sheet of thermoplastic or textile material in a mold, injecting thermoplastic resin under the sheet, and forming the object by compressing the sheet and the resin. A screen is interposed between the sheet and the thermoplastic resin. The permeability of the sheet is a function of the resin and of the compression. An incision of the sheet is formed in the area of the outer face of the sheet.