1, in fact, is the large and small intestines of livestock after scraping and become, according to the livestock can be divided into pig casings, sheep casings and cattle casings; according to the part can be divided into large casings, small casings; according to the type of natural casings and artificial casings; according to the different methods of processing, the casings can be divided into salted casings and dry casings. Enteric coating is the intestine from the inside out into mucosa, submucosa, muscle layer and plasma membrane 4 layers.

2, the casing can not only make sausage, but also can be made into tennis racket line, bowstring and surgical sutures and so on. Good quality casings should be tough and translucent, but now the casings are generally collagen edible casings.

3, in fact, pig casings are made from pig intestines, and sheep casings are naturally made from sheep intestines, the biggest difference is that the source is different chant. Generally speaking, the enema is of course the choice of the pig sausage is good, because the pig sausage expandability is better, not easy to break, and the pig sausage is not so big flavor. Pork sausage casings are the most common, and the taste is also very good, suitable for making some red sausage and so on. And sheep intestines because of its own relatively fine, soft, thin, it is particularly suitable for the production of small roasted sausage and so on.

4, in fact, pig casings and sheep casings are not comparable, mainly to look at everyone's tastes, some people taste heavier, like sheep casings, while some people do not like the taste of heavy, like to use pig casings. In addition to natural casings that are edible, there is also the man-made protein casings that have been mentioned above, which are edible, low cost and safe. Many people say that artificial enteric coating has rubber inside, which is harmful to the human body, in fact, the artificial protein enteric coating does not have no rubber inside, we can safely eat.