What is the difference between a positive and negative pressure molding machine and a split machine

The difference between negative pressure suction molding machines and positive and negative pressure suction molding machines is that negative pressure suction molding machines only have suction molding functions, while positive and negative pressure suction molding machines have blowing and suction molding functions; Negative pressure suction molding machine is lower in cost and simpler in structure than positive pressure suction molding machine.
Principle of blister molding machine: blister molding is also called thermoplastic molding. This molding process mainly uses vacuum generated PVC, PET, PETG, APTT, PP, PE, PS, etc.
Thermoplastic sheets are molded into various shapes of vacuum hoods or attached to the surfaces of various shapes of products. According to the thickness of the sheet, blister can be divided into thin sheet blister and thick sheet blister.
The main structure of the machine is composed of feeding, pulling, upper and lower electric heating furnaces, lower switches, multifunctional adjustable sizes, lower mold plates, upper molds, upper switches, knife switches, slicing, chip placement, and vacuum devices;
The common products of thick sheet blister include: home appliance inner casing, luggage compartment, exhibition rack accessories, decoration, car interior, bumper, fender, beauty equipment, light box casing, toy car casing, industrial panel, advertising light box, blister LOGO, bathroom products, refrigerator inner casing, and so on.