Casings fall into two categories: natural casings and artificial casings.

Natural casings mainly use animal intestines, the most commonly used is pig intestines, cattle intestines, sheep intestines.

Advantages of natural casings: edible, good taste, breathable, good toughness, good shrinkage and expansion of elasticity, the best short-term use

Disadvantages of natural casings: not suitable for long time preservation, easy to breed bacteria, diameter is not uniform, less output, not suitable for factory mass production.

Artificial casings: collagen casing, fiber casing, cellulose casing, plastic casing, etc.

Advantages of edible artificial casings: Collagen casings are edible casings, which contain functional products with high protein, low sugar and low fat. They are suitable for making sausages, which can be dried, cooked and roasted.

Good taste, natural appearance; Stable and uniform caliber; Food safety and traceability; Hygiene (more bacteria in natural casings); Can be customized according to needs (size, shape, color, etc.); Permeable flue gas and water vapor highlight the best smoking and coloring effect; Printable to create more personalized products; Stretchability: can shrink with sausage.