In the composite paper forming process, the forming principle of blister paper is a crucial technology.
Blister paper forming is mainly based on the principles of thermoplasticity and vacuum adsorption. First, in the raw material preparation stage, select suitable thermoplastic plastic sheets, such as PET, PVC, etc. These materials have good plasticity and transparency.
Next is mold preparation. According to the shape and size required by the final product, the corresponding blister mold is carefully made. The precision of the mold directly affects the forming effect. Then put the plastic sheet into the heating area of the blister machine, and soften the sheet through the heating device. The heating temperature must be precisely controlled above the melting point of the plastic sheet.
When the plastic sheet is softened, it is placed on the mold. At this time, the vacuum pump is started to form a negative pressure environment inside the mold. Under the action of vacuum suction, the softened plastic sheet will be tightly adsorbed on the mold surface. At the same time, the bottom of the mold can provide auxiliary pressure to ensure that the plastic sheet fits the mold completely without leaving any gaps.
After the adsorption is completed, the plastic sheet is quickly cooled and solidified by the cooling system. The cooling method can be natural cooling or cooling water circulation. After the plastic sheet is completely solidified, stop the negative pressure adsorption, open the mold, and you can get the formed blister paper product. Finally, the formed blister paper is trimmed as needed, such as cutting, drilling, trimming, etc., to meet the final specifications and requirements.
The forming principle of blister paper enables it to produce products with complex shapes, rich details, high surface finish and good precision. It is widely used in toys, electronic product shells, advertising signs, auto parts and other fields, providing strong technical support for the development of the composite paper industry.