What is the shell made of?

Casings can be roughly divided into natural casings and artificial casings.

Natural casing mainly uses the longest small intestine in animal viscera. Now the small intestine of sheep is generally used, so it is also called sheep casing, and the small intestine of pig is called pig casing. Cow intestines and horse intestines were used to make casings.

These natural casings are characterized by good air permeability, so the products are properly dried and smoked, and the smoked components are attached to the products to get people's favorite flavor, and the casings can be eaten directly.

Artificial casings are divided into breathable casings and airtight casings. Breathable casings can be divided into edible casings and non-edible casings. Edible casings are made of animal skins, and their properties are similar to those of natural casings. We call it collagen casing, which is breathable and edible. Non-edible casings mainly include cellulose series casings and cellophane. Cellulose series casings can be divided into cellulose casings and fiber casings, which are characterized by air permeability but inedible. Now there is also a kind of non-edible casing which is made of plastic and breathable, so it is named as absorbable plastic casing.

Airtight casings are mainly plastic casings, which can be divided into polyvinylidene chloride (PVDC) casings and nylon casings according to different materials, and can be divided into sheet casings and tubular casings according to different shapes. This kind of casing has many varieties and specifications, can be printed, is convenient to use, bright and beautiful, and is suitable for cooking products.