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PROCESS DESCRIPTION DIRECT EXPANSION
  • In a mixer-moistener, the raw materials suitable for extrusion are mixed and/ or brought to the right moisture content.
  • Potato granules or flour can be used in combination with at least 40% maize grits or rice grits.
  • The moisture content can be 13 - 19%, depending on the type of raw material.
  • The prepared mix is fed into the extruder hopper.
  • With the extruder you produce a half-product with moisture content of 8-13%.
  • For a good shelf life of the product it is necessary that the moisture content is as low as possible.
  • This means that we have to dry the half-product.
  • This is done in a rotating dryer or a belt dryer.
  • From the dryer, the half-product is transported to the coating drum where the product is flavoured with an oil-flavour mixture.
  • The oil-flavour mixture is prepared in the small mixing vessel and it flows into the coating drum by gravity.
  • After flavouring in the coating drum, the product is led to a silo or stored in plastic bags to enable the aroma to soak in the product.
  • If stored in a silo, the product must be packed within an hour.
  • In plastic bags, if closed, the product can be kept for a longer time.
  • The last operation of the process is packing the product with a packing machine.
  • The transport of the product between the different units goes by means of suitable convey-systems, depending on the erection of the machines.
  • An extruder plant can be installed vertically as well as horizontally, depending on the building and the available space.
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