What are the similarities and differences among extrusion curing, expansion curing and expansion curing?

Extrusion curing is the natural heat generated by the rotation of the screw and the mechanical friction of the material, and the curing degree is poor. Expansion curing is developed on the basis of extrusion curing, and the curing degree is more thorough, but the production energy consumption and cost are high. * * * The same feature is that the screw rotates to push the material forward, generating mechanical friction or shear heat to solidify the material.

The processing equipment and principle of expansion curing are similar to those of expansion curing, but the processing parameters are much milder and the curing degree is slightly lower than that of expansion curing, but the output per unit time is higher, the energy consumption is relatively lower and the processing cost is lower than that of expansion curing. Among the three processes, the yield of extrusion ripening is the lowest, and the damage of anti-nutritional factors is the worst, but the loss of vitamins, amino acids and other nutrients is small. The curing system and anti-nutritional factors of expansive curing are the highest, and the vitamin loss is great. If the process parameters are not properly adjusted, the available lysine will be greatly destroyed.

When it is necessary to produce puffed feed for young animals and pets with high maturity and maximum destruction of anti-nutritional factors, and to produce floating aquatic products, puffing is used to accelerate ripening; It is suggested that the expansion curing process should be adopted when producing cured crumbs or granules with high curing degree, large output and low production cost. Traditional extrusion curing can only produce some oil cakes or semi-wet granules of carnivorous fish or pets.

The content of this article comes from: Encyclopedia of Animals and Plants of China Agricultural Publishing House.