肠衣大体上可分为天然肠衣和人造肠衣。

The casing is generally divided into natural casing and artificial casing.

　　1、天然肠衣

1, natural casing

　　主要利用动物内脏中最长的小肠，现在一般用羊的小肠故又称为羊肠衣，猪小肠作肠衣便称为猪肠衣。过去还用过牛肠和马肠作肠衣。这些天然肠衣的特点是透气性好，所以对产品进行适当干燥后，进行烟熏，烟熏成分附着在产品上，得到人们喜欢的风味，且肠衣可直接食用。

The small intestine, which is the longest in the animal intestines, is now commonly referred to as the intestines of sheep. In the past, it was used to make intestines and intestines. These natural casing is characteristic of good permeability, so the product properly dried, smoked, smoked composition is attached on the product, to get people like flavor, and the casing can be directly to eat.

　　2、人造肠衣

Artificial casing

　　人造肠衣分为透气性肠衣和非透气性肠衣。透气性肠衣又可分为可食性的和非可食性的肠衣两种，可食性肠衣是以动物的皮等作为原料，其性质和天然肠衣相近似，我们称之为胶原肠衣，其特点是有透气性且可食用。

The synthetic casing is divided into breathable casing and non-breathable casing. Can be divided into the edibility of permeability is casing and the edibility of casing, edibility casing is animal skin as raw materials, such as the nature and natural casing phase approximation, we call this the collagen casing, characterized by permeability and edible.

　　非可食性肠衣主要包括纤维素系列肠衣和玻璃纸，纤维素系列肠衣又可分为纤维素肠衣和纤维状肠衣，这一类肠衣的特点是有透气性但不可食用。目前还有一种非可食性肠衣是用塑料制成，这种肠衣也具有透气性，可烟熏，故取名叫可烟熏塑料肠衣。

The edibility casing series mainly include cellulose casings and cellophane, cellulose series can be divided into the cellulose casing and casing fibrous casing, the characteristics of this type of casing is permeability but not edible. There is also a non-edible casing made of plastic, which is also breathable and smoky, and is called a smoked plastic casing.

　　非透气性肠衣主要是塑料肠衣，根据材料的不同可分为聚偏二氯乙烯（PVDC）肠衣和尼龙肠衣等，根据形状不同又可分为片状肠衣和筒状肠衣。这类肠衣品种规格较多，可以印刷，使用方便，光洁美观，适合于蒸煮类产品。

The permeability is casing mainly plastic casing, depending on the materials can be divided into the polyvinylidene chloride (PVDC) casing and nylon casing, etc., according to the different shapes and can be divided into flake casing and tubular casing. This kind of casing variety is more and more, can be printed, easy to use, smooth and beautiful, suitable for cooking class products.