Biodegradable molded packing

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 65/46 (2006.01) B65D 81/107 (2006.01) B65D 81/113 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08J 9/224 (2006.01) C08J 9/232 (2006.01) C08L 3/02 (2006.01)

Patent

CA 2231229

A method for making molded packing shapes comprising the sequential steps: (1) forming a plurality of particles comprising a foamed admixture of starch, biodegradable polymer and water; (2) applying to the surface of the particles an unheated aqueous liquid to effect wetting and softening of the surfaces of the particles; and (3) without applying extraneous heat to the system, compressing the surface-softened particles within a confined space to effect cohesion between the surfaces of the softened particles and formation of an article in the form of the confined space; and (4) maintaining the shaped article under such compression for a time sufficient to render the surface of the particles non-tacky by adsorption of the wetting liquid into the particles and by evaporation of the wetting liquid.

La présente invention concerne un procédé de fabrication de diverses formes d'emballages moulés, comprenant les étapes successives ci-après: (1) former une pluralité de particules contenant une matière ajoutée présentée sous forme de mousse constituée d'amidon, d'un polymère biodégradable et d'eau; (2) appliquer à la surface des particules un liquide aqueux non chauffé destiné à humecter et à ramollir les surfaces des particules; et (3) comprimer les particules dont la surface a été ramollie dans un espace confiné, sans avoir recours à une source de chaleur extérieure au système, afin d'assurer la cohésion entre lesdites surfaces de particules et de former un article dont la forme sera celle de l'espace confiné; et (4) maintenir l'article dans cet état de compression pendant un temps suffisant pour que la surface des particules ne soit pas collante, c'est-à-dire que le liquide d'humectage soit adsorbé dans les particules et qu'il soit évaporé.

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