Vacuum packaging machine packaging adhesives can be roughly divided into two categories: natural and synthetic. Natural adhesives can be further divided into plant starch or protein. They have been adopted by the vacuum packaging industry for many years. product. Starch adhesives are currently used in large quantities, but have been replaced by synthetic adhesives in many applications in recent years, and this tendency continues. The adhesives for vacuum packaging machines can be divided into four categories from the physical form.
The raw material of the starch-type adhesive is raw flour or left starch, which is processed and modified to make starch or dextrin. The starch made from one or more types can be made from corn or tapioca. Starch and its derivatives are usually blended with chemical additives to obtain corresponding properties. Glue is a special type of desiccant. It has a strong adhesive force. After the glue is applied, it will adhere immediately when it is cold. There are two types of protein binders for vacuum packaging: casein gum and animal gum. Casein gum is a product made by skim milk acidification. Casein has a series of advantages such as high adhesiveness, good flow properties, strong adhesion, and poor solubility in water.
Officially because of its cold water resistance, the label can only be washed off with an alkaline cleaning solution. Animal glue is made by hydrolyzing the collagen tissue in animal leather or bone. Made in different forms such as dry, liquid or frozen tablets, the vacuum packaging machine has a strong viscosity and a wide range of viscosity. The purpose of vacuum packaging is to wrap the tube, so that it can be used as an adhesive for carton manufacturing.