In the natural casing industry, the animal small intestine is divided into three layers: the outer skin, the middle casing, and the inner mucous membrane. The mucous membrane is extruded through a specialized scraping machine, the skin is peeled off, and what's left is semi-finished casings.
Since there are semi-finished products, what is the difference with finished products? The main difference is the caliber, hole, appearance of three aspects: first of all, the caliber of the natural sausage, natural sausage with the word "natural", is the animal stomach grows out, so there are thick and thin, to the pig sausage, for example, the maximum difference in caliber can reach more than 2 cm, so the need for skilled workers to pick and sort the caliber of similar to be classified. The second is the broken hole, in the small intestine, transportation, over the scraping machine and other steps, it is easy to break the small intestine and semi-finished sausage casings, the hole is small, it will not affect the perfusion sausage, if it is large, perfusion sausage meat are flowing out how to do? Therefore, the semi-finished sausage casing to remove the hole (a hole in the hole in the casing cut, there are two casing without holes), the national standard stipulates that the diameter of 2 mm or more holes are to be removed. Finally, the appearance, affect the appearance of the main residual mucous membrane in the casing (finished product processing link by manual removal), color (normal color is creamy white, yellowish, pinkish white, if black or too white, it is not a good sausage casing ), twine and shape (does not affect the food, but affects the appearance of the sausage) and so on.
The sorting of pig and sheep casings is carried out by filling the casings with water, while cattle casings are coarser and carried out by inflating. After sorting, the casing is salted and put into special casing drums for sale. The price of casing is very low and does not account for much of the cost of sausage production. If the home enema need to buy retail sausage, the price of 1 yuan / meter can be, a meter can be made about 1 kg of sausage, compared to the price of meat, the cost is basically negligible.
Artificial casing has collagen casing, cellulose casing, plastic casing, etc., not to mention.