作为包裹在香肠馅料外的一层薄膜状材料，肠衣是家畜的大、小肠经刮制而成的坚韧半透明薄膜。
As a thin film material wrapped around sausage filling, sausage coat is a tough translucent film made by scraping large and small intestines of livestock.
一般来说，香肠的肠衣分为以下几种：天然肠衣、可食用的胶原蛋白肠衣、不可食用的纤维素肠衣及塑料肠衣，后两种皆属于人造肠衣。纤维素肠衣由于不可食用，使用范围有限。而天然肠衣具有口感好、成本较高的特点。
Generally speaking, sausage sausage is divided into the following categories: natural sausage, edible collagen sausage, non-edible cellulose sausage and plastic sausage, the latter two belong to artificial sausage. Cellulose sausage is inedible and has limited use. Natural sausage has the characteristics of good taste and high cost.