Method and mold for manufacturing biodegradable molded articles

Details Method and mold for manufacturing biodegradable molded articles Method and mold for manufacturing biodegradable molded articles

B - Operations, Transporting

29

C

B29C 39/10 (2006.01) B29C 43/20 (2006.01) B29C 44/00 (2006.01) B29C 44/14 (2006.01) B29C 44/56 (2006.01) B29C 43/18 (2006.01)

Patent

CA 2479080

Using a metal mold (20a) consisting of a convex mold part (21a) and a concave mold part (22a), a molding material (14) is placed between a pair of coating films (12), and after clamping, the molding material (14) and the coating film (12) are heated and molded to make a biodegradable expanded molded article, and at the same time, the coating film (12) is softened and pressure-bonded to a surface of the biodegradable expanded molded article. An exhaust hole (31a) and (32a) are provided on the convex mold part (21a) and the concave mold part (22a), respectively. At the time of heating and molding, gaseous matter existing between the coating film (12) and a surface of the metal mold (20a) is discharged out of the metal mold (20a)through the exhaust holes (31a) and (32a). Accordingly, it is possible to provide a method and a mold to manufacture a biodegradable expanded molded article easily and with excellent accuracy of dimension, having enough strength, enough water resistance, very excellent biodegradability and excellent surface smoothness even if the biodegradable molded article has a complicated shape.

Selon l'invention, on utilise des matrices (20a) comprenant une pièce convexe (21a) et une pièce concave (22a). Deux films de revêtement (12) comprenant une matière de moulage (14) intercalée entre ces films sont disposés entre la pièce convexe (21a) et la pièce concave (22a), puis bloqués et chauffés. Ainsi, parallèlement à l'obtention d'un article moulé en mousse biodégradable par moulage par expansion de vapeur, les films de revêtement (12) sont ramollis et liés par compression à une surface de l'article moulé en mousse biodégradable. Par conséquent, l'invention concerne un procédé permettant de produire un article moulé biodégradable présentant une solidité élevée, y compris avec une configuration complexe, ainsi qu'une bonne résistance à l'eau, une haute biodégradabilité et une excellente régularité de surface. Ledit article peut être formé de manière simple et avec une précision élevée au moyen de matrices de moulage appropriées.

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