Systems for molding articles which include a hinged starch-bound

Details Systems for molding articles which include a hinged starch-bound Systems for molding articles which include a hinged starch-bound

1996-06-10

1998-01-06

Davis, Robert

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

Including both heating and cooling means

249115, 261327, 425412, 425420, 425817R, B29C 4458, B29C 4352

Patent

active

057052034

ABSTRACT:
Methods and systems for forming hinged starch-bound matrices. Starch-based compositions are molded between heated molds in order to form a cellular matrix and also to remove the water from the starch-based compositions in order to form a binding matrix of solidified starch. The molding apparatus is configured to form one or more creases within the hinge area in order to define one or more lines upon which the hinge will bend. The molding apparatus is also configured such that the region of the mold corresponding to the inner surface of the hinge area will transfer heat more slowly to the inner hinge surface, resulting in reduced thickness of the skin of the inner hinge. This increases the collapsibility, or ability of the inner surface of the hinge to fold or buckle, during the bending action. This in mm reduces the bending radius of hinge such that the hinging action exerts less strain on the outer surface of the hinge. The inner surface of the hinge may optionally be treated with glycerin or other polyols to soften the inner surface. The outer surface of the hinge may optionally be coated with an elastomeric material, such as polyvinyl alcohol, in order to strengthen the outer surface and reduce its tendency to fracture during the hinging action.

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