Methods for molding hinged starch-bound articles

B - Operations – Transporting – 29 – C

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B29C 44/06 (2006.01) B29C 43/06 (2006.01) B29C 43/36 (2006.01) B29C 44/04 (2006.01) B29C 44/56 (2006.01) C08J 7/04 (2006.01) C08J 9/28 (2006.01) C08J 9/36 (2006.01)

Patent

CA 2250717

Method 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 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 (230) within the hinge structure (200) 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 interior skin portion (224) of 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 turn reduces the bending radius of the hinge such that the hinging action exerts less strain on the outer surface of the hinge. The inner surface of the hinge may optionally by treated with glycerine or other polyol to soften the inner surface. The exterior skin portion (226) 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.

Procédé et systèmes permettant de former des matrices articulées liées à l'amidon. Pour former une matrice cellulaire et évacuer l'eau des compositions à base d'amidon, on moule ces dernières entre des moules chauffés afin d'obtenir une matrice liante en amidon solidifié. L'appareil de moulage est configuré pour créer un ou plusieurs plis (230) dans la structure articulée (200) afin de définir une ou plusieurs lignes de pliage au niveau des articulations. L'appareil de moulage est également configuré de telle sorte que la partie du moule qui correspond à la surface interne de la zone articulée transmet lentement la chaleur à la partie intérieure de la peau (224) de la surface intérieure de l'articulation, ce qui permet de réduire l'épaisseur de la peau de ladite surface intérieure de l'articulation. Ce procédé permet d'augmenter l'aptitude de la surface intérieure de l'articulation à s'affaisser, à se plier ou à flamber lors du pliage; ce qui permet de réduire le rayon de pliage de l'articulation, de telle sorte que le pliage exerce un moindre effort de contrainte sur la surface extérieure de l'articulation. Pour rendre la surface interne de l'articulation plus souple, on peut la traiter avec de la glycérine ou avec un autre polyol. La partie extérieure de la peau (226) de l'articulation peut être éventuellement recouverte d'un élastomère tel qu'un alcool polyvinylique afin de renforcer la surface extérieure et de réduire sa tendance à se fracturer lors du pliage.

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