Method of making an integrated door inner panel and an article made thereby
View Patent ↗A method of making an integrated inner trim panel for a vehicle door and an inner trim panel made thereby are disclosed. The method includes sequentially spraying a skin layer, a padding layer, and applying a structural layer in an open mold that defines the facing surface of the inner panel of a door. The integrated inner trim panel may be provided with areas of greater and lesser padding. The skin layer may be formed from a reactant mixture of polyurethane. The padding layer may be a foam polyurethane composition. The structural layer may be a glass-reinforced polyurethane reactant mixture. The inner door panel is an integrated layered structure including a skin layer, a padding layer, and a structural layer. The padding layer may be varied in thickness to provide selectively variable padding in predetermined areas.
1. A method of making an integrated inner trim panel of a door for a vehicle comprising:
providing an open mold that defines a facing surface of the inner panel of the door, wherein the mold further defines an armrest cavity;
spraying a skin layer on the facing surface and into the armrest cavity with a spray tool that sprays a reactant mixture of polyurethane;
spraying a padding layer onto the opposite side of the skin layer from the facing surface and the armrest cavity, the armrest cavity being sprayed to a first thickness in a first portion of the armrest cavity and to a second thickness in a second portion of the armrest cavity that is thinner than the first portion with the spray tool that sprays a reactant mixture comprising a polyurethane reactant mixture and a blowing agent, inserting and supporting a core in a void in the padding layer before filling the void in the armrest cavity, and leaving the void in the padding layer within the armrest cavity; and
applying a structural layer onto the padding layer on the opposite side of the padding layer from the skin layer, filling the void in the armrest cavity and covering the padding layer opposite the facing surface, the structural layer comprising a reaction mixture of a polyurethane reactant mixture and a glass fiber reinforcement material.
2. The method of claim 1 wherein the armrest cavity has a planar surface that is generally perpendicular to the facing surface and a contoured surface that interconnects a distal end of the planar surface to the facing surface.
3. The method of claim 2 wherein the padding layer is sprayed into the first portion of the armrest cavity behind the planar surface.
4. The method of claim 2 wherein the padding layer is sprayed into the second portion of the armrest cavity behind the contoured surface.
5. The method of claim 1 wherein the mixture of polyurethane sprayed to form the skin layer consists essentially of polyol and isocyanate.
6. The method of claim 1 wherein the mixture of polyurethane sprayed to form the padding layer consists essentially of polyol, isocyanate and a blowing agent.
7. The method of claim 1 wherein the step of providing the structural layer further comprises heating the reactant mixture and glass fiber reinforcement material in an oven.
8. The method of claim 1 wherein the glass fiber reinforcement material is a quantity of chopped glass fibers.
9. The method of claim 1 wherein the glass fiber reinforcement material is a glass fiber mat.