Thermoforming is a PVC rigid film processing technology, the main principle is the flat PVC rigid film after heating soft, vacuum adsorption on the surface of the mold, after cooling forming, widely used in plastic packaging, lighting, advertising, decoration and other industries.
PVC rigid film blister packaging: The use of blister process to produce plastic products, and the corresponding equipment for packaging products.
PVC rigid film blister packaging products include: bubble shell, tray, blister box, synonyms also: vacuum cover, blister, etc.
The main advantages of blister packaging are saving raw and auxiliary materials, light weight, convenient transportation, good sealing performance, in line with the requirements of environmental protection green packaging; Can pack any abnormal-shaped products, packing without additional buffer material; The packaged products are transparent and visible, beautiful appearance, easy to sell, and suitable for mechanization, automation packaging, convenient for modern management, manpower saving, improve efficiency.
Diagram of PVC rigid film thermal forming process flow
General process: plastic sheet - cutting - sheet fixed - heating - molding - stripping - edge - finished products
The requirements of PVC rigid film for blister molding :
1. Blister molding can only produce products with uniform wall thickness, (generally, the chamfer is slightly thinner), and can not make plastic products with great difference in wall thickness
2. The wall thickness of the blister molding is generally within the range of 1 to 2mm or thinner (the most commonly used thickness of the sheet with blister packaging is 0.15 to 0.25mm)
3. The tensile degree of plastic forming products is limited to a certain extent. The diameter and depth ratio of plastic containers for plastic forming is generally not more than 1, and in extreme cases not more than 1.5
4. The dimensional accuracy of blister molding is poor, and the relative error is generally more than one percent.