Sealing machine is a machine for sealing containers filled with packaging materials. After the products are packed into the packaging containers, it is necessary to seal the packaging containers in order to seal and preserve the products, maintain product quality and avoid product loss. This operation is completed on the sealing machine. According to the application of materials, sealing machines can be divided into the following common types: plastic bag sealing machine, milk tea sealing machine, vacuum sealing machine, plastic cup sealing machine, jelly filling sealing machine, fruit juice beverage filling sealing machine, instant noodle sealing machine, eight-treasure porridge filling sealing machine, coffee filling sealing machine, smoothie ice cream filling sealing machine, duck blood filling sealing machine, nitrogen sealing machine, small dish vacuum sealing machine, Chili sauce sealing machine.

The sealing formed by curling and hooking the periphery of the tank cover and the flange of the tank body is called crimping sealing. Cylindrical metal cans, which are widely used in canned food and beverage packaging, adopt this form of sealing. In order to prevent the joint part of the seal from leaking, glue (made of rubber or tree cool material) is generally coated on the concave edge of the cover, and then it is clamped in the seam after crimping to enhance the air tightness.