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In the market, thermoformed products more and more, such as cups, plates, food dish, toys, hats, helmets, and automotive parts, building trim, chemical equipment. Thermoforming and injection molding compare with high production efficiency, less investment in equipment and can create a larger surface area of the product and so on. Thermoforming packaging machine is under a heating condition for the thermoplastic deep-drawn sheet-like packaging material, the packaging container is formed, and then fill and seal machines. Filling in the thermoforming packaging machine can be completed separately thermoformed containers / packaging materials (quantitative), packaging sealing, cutting, trimming and other processes. Thermoformed packaging function continuously thermoplastic polyvinyl chloride or polyvinylidene chloride sheet molding such as the desired shape of the tray, and then heat sealing the top layer of aluminum foil, by punching into a certain special packaging shape. This package has a light weight, easy to transport, good sealing performance, no additional cushioning packing material, etc., to make this packaging machinery developed rapidly in recent years. For thermoforming plastics mainly polystyrene, polyvinyl chloride, polyolefins (e.g. polyethylene, polypropylene), polyacrylates (e.g. polymethyl methacrylate) and cellulose (such as cellulose nitrate, cellulose acetate, etc.) plastic, also for engineering plastics (e.g. ABS resin, polycarbonate). There are a variety of thermoforming process, but basically in a vacuum, pneumatic or mechanical pressure to be based on a combination of three methods or improvements made.
Thermoforming equipment for the first time since the early twenties to enter the market, and in many types of plastic packaging, which has occupied a major position. There are indications that its importance will continue to increase, as there are many new packaging requirements are impossible to meet by other methods. With the increasing requirement. Thermoforming equipment constantly updated, improved from the early manual that can heat a single machine to a modern automatic thermoforming packaging machine. In terms of size, speed, and stability aspects of life significantly improved. China started the development of thermoformed packaging machinery and packaging materials late, relatively backward, so the research efforts of foreign thermoformed packaging machinery history and current status of their packaging materials.
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