Method for molding polyurethane seat pads
First Claim
1. A method for molding a polyurethane seat pad having a center seat portion and bank portions on opposite sides thereof or along the periphery thereof using a mold defining a cavity having a center region corresponding to the center seat portion and side regions corresponding to the bank portions, comprising the steps of:
- placing collecting vessels of expanded polyolefin in the side regions of the mold cavity,pouring a foamable polyurethane liquid for producing a low hardness foam into the cavity between said collecting vessels,pouring a foamable polyurethane liquid for producing a high hardness foam into said collecting vessels, andcausing the foamable liquids to expand thereby producing a polyurethane seat pad having the collecting vessels embedded therein,wherein said expanded polyolefin is a crosslinked polyolefin foam having an index of surface wetting of at least 36 dyne/cm, a gel-fraction of 20 to 50% and density of 0.025 to 0.10.
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Abstract
A polyurethane seat pad having a center seat portion and bank portions therearound is molded by using a mold defining a cavity having a center region corresponding to the center seat portion and side regions corresponding to the bank portions, placing collecting vessels of expanded polyolefin in the side regions of the mold cavity, pouring a foamable polyurethane liquid for low hardness foam into the cavity between said collecting vessels, pouring a foamable polyurethane liquid for high hardness foam into said collecting vessels, and causing the foamable liquids to expand, thereby producing a polyurethane seat pad having the collecting vessels embedded therein. The expanded polyolefin is a crosslinked polyolefin foam having an index of surface wetting of at least 36 dyne/cm. The seat pad in which the bank portions have higher hardness than the seating portion and which is fully durable against repetitive loading can be produced to the desired configuration in a stable manner.
25 Citations
12 Claims
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1. A method for molding a polyurethane seat pad having a center seat portion and bank portions on opposite sides thereof or along the periphery thereof using a mold defining a cavity having a center region corresponding to the center seat portion and side regions corresponding to the bank portions, comprising the steps of:
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placing collecting vessels of expanded polyolefin in the side regions of the mold cavity, pouring a foamable polyurethane liquid for producing a low hardness foam into the cavity between said collecting vessels, pouring a foamable polyurethane liquid for producing a high hardness foam into said collecting vessels, and causing the foamable liquids to expand thereby producing a polyurethane seat pad having the collecting vessels embedded therein, wherein said expanded polyolefin is a crosslinked polyolefin foam having an index of surface wetting of at least 36 dyne/cm, a gel-fraction of 20 to 50% and density of 0.025 to 0.10. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification