A method and apparatus for extrusion of expanding water...

A - Human Necessities – 23 – P

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A23P 1/12 (2006.01) A23K 1/00 (2006.01) A23N 17/00 (2006.01) A23P 1/14 (2006.01)

Patent

CA 2334141

In the extrusion of feed-stuff pellets and relevant consumer products, the extruded products are subject to expansion as a result of the boiling of their water content when the products, after being exposed to high extrusion pressure and a correspondingly high temperature, are discharged to the atmosphere through the extrusion nozzles. Such an expansion is directly aimed at, but it is desirable to be able to control it, which is difficult by adjustment of the ordinary process parameters. With the invention it has been found that the expansion which arises can be controlled in a highly constant manner, i.e. by carrying out the extrusion into a closed chamber in which an over-pressure of a few bar is established in relation to the atmospheric pressure, and which can be regulated. The extrusion products can be continuously discharged from this chamber, or they can be discharged intermittently in portions. The over-pressure moderates the momentary development of steam in the extruded product, and the product is given time to stabilise before being discharged to atmospheric pressure, so that the subsequent further development of steam influences the structure of the product only to a minor degree.

Lors de l'extrusion de matières premières alimentaires en granulés et de produits de consommation connexes, les produits extrudés sont sujets à une expansion du fait de l'entrée en ébullition de l'eau qu'ils contiennent lorsque, après avoir été soumis à une forte pression d'extrusion ainsi qu'à des températures élevées correspondantes, ils sont expulsés dans l'atmosphère par les buses d'extrusion. Cette expansion est voulue, mais il est souhaitable d'être en mesure de la maîtriser, ce qui est difficile par la seule adaptation des paramètres du procédé classique. Il est possible, grâce à cette invention, d'agir sur cette expansion de façon constante, notamment en procédant à l'extrusion dans une enceinte close dans laquelle règne une surpression de quelques bars par rapport à la pression atmosphérique, surpression sur laquelle on peut agir. Les produits d'extrusion sortent de cette enceinte sans discontinuer ou de façon intermittente par lots. L'existence d'une surpression permet de modérer la formation de vapeur dans le produit extrudé auquel il est laissé un certain délai pour qu'il se stabilise avant de se trouver soumis à la pression atmosphérique, de sorte que la formation subséquente de vapeur ne modifie que faiblement sa structure.

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