Process for molding cover materials for seating applications
A seat trim cover for an automotive seat is formed into a 3-dimensional shape by compression molding a laminated moldable foam in a 3-dimensional. The laminated moldable foam comprises at least a layer of cellular polyurethane foam compression moldable in a temperature range of about 220° F. to about 260° F. The 3-dimensional mold is heated to a temperature range of about 150° F. to about 320° F. The layer of cellular foam is adhered to a cover material layer and precut into a pre-laminated blank prior to molding into the 3-dimensional shape. Optionally, seat heaters or other components can be integrated with the laminated foam prior to compression molding the seat trim cover.
1 . A method of forming a 3-dimensional trim cover, said method comprising:
adhering a cover material to a moldable foam interlayer to form a laminate blank, said moldable foam interlayer is formulated to be compression moldable with a compressive force in a range of about 150 psi to about 250 psi and a foam molding temperature in a range of about 220° F. to about 260° F., said cover material comprising one or more a of vinyl, fabric, and/or leather;
placing said laminate blank between a lower 3-dimensional molding tool and an upper 3-dimensional molding tool;
lowering said upper 3-dimensional molding tool towards said lower 3-dimensional molding tool and applying compressive pressure in a range of about 150 psi and 250 psi on said laminate blank;
heating at least a portion of one or more of said molding tools to a temperature of about 150° F. to about 320° F. for about 90 seconds to about 10 minutes to form said 3-dimensional trim cover from said laminate blank;
adhering said cover material to said moldable foam interlayer with one of a one part urethane adhesive, a two part urethane adhesive, or flame lamination;
adhering a woven or non-woven fabric scrim backing to a lower side of said foam interlayer;
adhering a seat heater between said cover material and said foam interlayer;
removing said upper 3-dimensional molding tool from said formed 3-dimensional trim cover; and
removing said formed 3-dimensional trim cover from said lower molding tool.
2 . The method as set forth in claim 1 , said method comprising:
adhering a foam lining to a lower surface of said cover material prior to adhering said seat heater between said cover material and said foam interlayer.
3 . A method of forming a 3-dimensional trim cover, said method comprising:
adhering a cover material to a moldable foam interlayer to form a laminate blank, said moldable foam interlayer is formulated to be compression moldable with a compressive force in a range of about 150 psi to about 250 psi and a foam molding temperature in a range of about 220° F. to about 260° F., said cover material comprising one or more a of vinyl, fabric, and/or leather;
placing said laminate blank between a lower 3-dimensional molding tool and an upper 3-dimensional molding tool;
lowering said upper 3-dimensional molding tool towards said lower 3-dimensional molding tool and applying compressive pressure in a range of about 150 psi and 250 psi on said laminate blank;
heating the lower molding tool and the upper molding tool to a mold surface temperature of about 150° F. to about 320° F. for about 90 seconds to about 10 minutes, wherein the mold surface temperature of the lower molding tool is different than the mold surface temperature of the upper molding tool causing a temperature gradient within the foam interlayer such that the foam temperature within the foam interlayer is at least 220° F. and less than or equal to 260° F. to form said 3-dimensional trim cover from said laminate blank;
adhering said cover material to said moldable foam interlayer with one of a one part urethane adhesive, a two part urethane adhesive, or flame lamination;
adhering a woven or non-woven fabric scrim backing to a lower side of said foam interlayer; and
adhering a seat heater between said cover material and said foam interlayer;
removing said upper 3-dimensional molding tool from said formed 3-dimensional trim cover; and
removing said formed 3-dimensional trim cover from said lower molding tool.
4 . The method as set forth in claim 3 , said method comprising:
adhering a foam lining to a lower surface of said cover material prior to adhering said seat heater between said cover material and said foam interlayer.