Process and apparatus for producing starch melt and products...

B - Operations – Transporting – 29 – C

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B29C 47/36 (2006.01) B29C 47/78 (2006.01) C08B 30/12 (2006.01) C08B 30/16 (2006.01) C08L 3/04 (2006.01)

Patent

CA 2070041

A process for the production of a homogeneous, thermoplastically processible melt. The process includes a. introduction of chemically modified starch into an intake zone of an extruder and conveyance thereof to a receiving zone, b. addition of a prehomogenized liquid mixture of plasticizer, emulsifier, and additives, followed by mixing and further conveyance of the starch liquid mixture through the receiving zone at elevated temperature, c. destructurization of the modified starch without adding any water and conveyance of the starch and mixture at elevated temperature to form a homogeneous, thermoplastically processible melt, d. degassing of the melt at elevated temperature and under reduced pressure, and e. extrusion thereof through a die at elevated temperature and pressure.

Procédé pour la production d'un produit fondu, homogène, transformable par voie thermoplastique. Le procédé comprend les étapes suivantes : a) introduction d'amidon modifié chimiquement dans une zone d'alimentation d'une extrudeuse et transport de l'amidon jusque dans une zone réceptrice; b) addition d'un mélange liquide préhomogénéisé d'un plastifiant, d'un émulsifiant et d'additifs, suivie du mélange et du transport du mélange liquide d'amidon à travers la zone réceptrice à température élevée; c) déstructuration de l'amidon modifié, sans addition d'eau, et transport de l'amidon et du mélange à température élevée pour former un produit fondu, homogène, transformable par voie thermoplastique; d) dégazage du produit fondu à température élevée et sous pression réduite; e) extrusion du produit à travers une filière à température et pression élevées.

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