Method for making foamed articles having a laminated structure
AssigneeBridgestone Corporation
InventorsNobuhisa Fuchigami, Takeo Yoshida, Hiroya Fukuda
Life of this patent
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Abstract
A method for making a foamed article having a laminated structure comprises providing a mold having a cavity therein and a rib vertically mounted from a bottom of the cavity and having a predetermined height to establish at least two blocks on the bottom, and pouring a foamable liquid compositions into the respective blocks in amounts which permit one of the foamable liquid composition to cover the other foamable liquid composition upon foaming whereby the resulting foam has a laminated structure whose boundary between the foamed layers made of the respective foamable liquid compositions is smooth and agreeable to the touch.
Claims16
A method for making a cushion for automotive seats having a laminated structure of polyurethane foams which comprises:
- providing a mold having a cavity therein and a rib vertically mounted from a bottom of the cavity and having a predetermined height to establish at least two blocks on the bottom;
- and pouring foamable liquid compositions for making polyurethane foams into the respective blocks in amounts which permit one of the foamable liquid compositions to cover the entire surface of the other foamable liquid composition upon foaming whereby the resulting foam has a laminated structure of polyurethane foams whose boundary between the respective polyurethane foam layers is smooth and agreeable to the touch.
A method for making a cushion for automobile seats having a laminated structure of polyurethane foams which comprises setting a mold in such a way that part of a cavity face is inclined, pouring a first foamable liquid composition for making polyurethane foam into the cavity of the mold, and further pouring a second foamable liquid composition for making another polyurethane foam from a position, which is above the surface of the first foamable liquid composition, onto the inclined cavity face during a time between the commencement of foaming of the first foamable liquid composition and the completion of the foaming whereby the second foamable liquid composition is permitted to slip under the first foamable liquid composition and is foamed to obtain a foam having a laminated structure of polyurethane foams in which a polyurethane foam layer obtained from the first foamable liquid composition covers the surface of another polyurethane foam layer obtained from the second foamable liquid composition.
A method for making a cushion for automobile seats having a laminated structure of polyurethane foams which comprises setting a mold in such a way that part of a cavity face is inclined, pouring a first foamable liquid composition for making polyurethane foam into the cavity of the mold, and further pouring a second foamable liquid composition for making another polyurethane foam from a position, which is above the surface of the first foamable liquid composition, onto the inclined cavity face during a time between the commencement of foaming of the first foamable liquid composition and the completion of the foaming wherein when said second foamable liquid composition is poured, it has a specific gravity higher than the specific gravity of said first foamable liquid composition whereby the second foamable liquid composition is permitted to slip under the first foamable liquid composition and is foamed to obtain a foam having a laminated structure of polyurethane foams in which a polyurethane foam layer obtained from the first foamable liquid composition covers the entire surface of another polyurethane foam layer obtained from the second foamable liquid composition.
Dependencies are inferred from the claim text.