Method for sterilizing powder or grain and sterilizing...

A - Human Necessities – 23 – L

Patent

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A23L 3/22 (2006.01) A61L 2/06 (2006.01)

Patent

CA 2722477

[Problem to be solved] To provide a method for sterilizing powder or grain by which the heating time is a minimum required time to reduce thermal degradation of the quality of the powder or grain while securing sufficient sterilization effect, and a sterilizing apparatus employing the method. [Means to solve the problem] The problem is solved by a method for sterilizing powder or grain, and a sterilizing apparatus employing the method, and the method includes applying heat and pressure in which powder or grain is supplied into a heated gas flow pipe kept under heated and pressurized conditions, and the powder or grain is transferred while coming into direct contact with a heated condensable gas in the heated gas flow pipe for 0.008 to 2 seconds, and instantaneous reduced pressure sterilizing in which the heated condensable gas and the powder or grain are instantaneously released into a space having a pressure lower than that in the heated gas flow pipe, water contained in microorganisms adhering to the powder or grain is boiled rapidly, and tissues of the microorganisms are destroyed.

L'invention porte sur un procédé de stérilisation de substances pulvérulentes ou granulaires qui peut protéger les substances pulvérulentes ou granulaires d'une détérioration de qualité provoquée par un chauffage et qui peut atteindre un effet de stérilisation suffisant et sur un appareil de stérilisation approprié pour le procédé. Le procédé de stérilisation de substances pulvérulentes ou granulaires est caractérisé en ce qu'il comprend l'étape de chauffage/pressurisation consistant à amener une substance pulvérulente ou granulaire dans un conduit d'écoulement de gaz de chauffage maintenu dans un état chauffé et pressurisé et à transférer la substance pulvérulente ou granulaire tout en amenant la substance pulvérulente ou granulaire en contact direct avec un gaz de chauffage condensable pendant 0,008 à 2 secondes dans le conduit d'écoulement de gaz de chauffage et l'étape de stérilisation sous vide instantanée consistant à libérer le gaz de chauffage condensable et la substance pulvérulente ou granulaire instantanément dans un espace ayant une pression inférieure à celle dans le conduit d'écoulement de gaz de chauffage afin de faire bouillir l'eau contenue dans les micro-organismes adhérant à la substance pulvérulente ou granulaire et ainsi détruire le tissu des micro-organismes. L'invention porte également sur un appareil de stérilisation de substances pulvérulentes ou granulaires au moyen du procédé.

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