Method for the production of biodegradable foamed products

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 44/02 (2006.01) B29B 11/10 (2006.01) B29C 35/08 (2006.01) B29C 44/34 (2006.01)

Patent

CA 2419180

A method for the production of a biodegradable foamed product 7 from a base material and a blowing agent 1. The base materials are mixed with a blowing agent and any other required additives 1. The mixture 3, after extrusion 2, is placed in a microwave transparent mould 6 and processed in a microwave via distinct steps. The first step preheats the extrudate to a temperature just below the flash point 6. The second step 7 rapidly heats the extrudate beyond the flash point causing the extrudate to foam in the mould 7. By utilising this method it is possible to produce shaped articles with uniform properties and with packaging properties such as compressibility, resilience and shock absorption.

L'invention concerne un procédé de production d'un produit moussant biodégradable (7) à partir d'une matière première et d'un agent gonflant (1). Les matières premières sont mélangées à un agent moussant et tout autre additif requis éventuel (1). Le mélange (3), après extrusion (2), est placé dans un moule transparent aux micro-ondes (6) et traité dans un micro-onde en plusieurs étapes. La première étape préchauffe l'extrudat à une température juste au-dessous du point d'éclair (6). La deuxième étape chauffe rapidement l'extrudat au-delà du point d'éclair, ce qui entraîne l'extrudat à mousser dans le moule (7). L'utilisation de ce procédé permet de produire des articles formés dotés de propriétés uniformes et de propriétés d'emballage, telles que la compressibilité, la résistance et l'absorption des chocs.

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