In thermoforming, based on the raw material form (sheet or roll) of the product, it can be divided into two categories: thick-walled and thin-walled. Large thick-sheet thermoforming Refers to the use of raw materials with a thickness exceeding 2mm, which cannot be thermoformed on a fully automatic machine. Forming, using thick-plate semi-automatic plastic molding machine technology.

　　The principle of large thick-sheet thermoforming processing is basically the same as conventional methods. Cut the plastic sheet into a certain size and heat it to soften it. Using the pressure difference on both sides of the sheet or mechanical pressure to deform it, then paste it on a specific mold. After cooling and shaping on the contour surface, the required product is obtained.

　　There are currently two main types of thermoforming processing on the market. One is thermoforming processing with a thickness of less than 2.5mm, which generally uses roll material processing and molding. The other is a thick blister, with a thickness of 3~12mm, which is formed using sheet material. The machines used for these two processing methods are different, so pay attention to the supplier's production capacity when looking for suppliers.

　　Advantages of large thick-sheet thermoforming:

　　1) The mold cost is lower than injection molding, the development cycle is short, and it is suitable for small-batch production.

　　2) A pair of molds can produce products of different materials and thicknesses.

　　Today's thermoforming industry is gradually developing, and more and more product components use thermoformed products. For example, automotive interior and exterior parts, rear-projection TV back shells, lampshade ceilings, various medical device shells, etc., are all produced by thick-sheet thermoforming machines. You may not be very familiar with thick-film thermoforming machines, so Teshuo editor will introduce its composition and main functions to help you.

　　 Large thick-sheet thermoforming The machine generally consists of a plate positioning system, a plastic mold positioning system, a frame system, a heating system, a cooling system, and an electrical control system.

　　(1) Composed of a well-shaped pressure plate frame, a power cylinder or oil cylinder, and a balance synchronization mechanism. Its function is to tighten the positioning of the plastic sheet. The clamping frame of the walking frame heating method is a lifting structure, and a horizontal locking mechanism is added to ensure that the clamping frame is tightly sealed with the plate pad plate. The frame can be adjusted according to the size of the mold, which is divided into manual adjustment and automatic adjustment;

　　Thick-film thermoforming

　　(2) Composed of upper and lower mold tables, upper and lower mold oil cylinders or oil cylinders, and synchronization mechanisms. Its function is to fasten the plastic positioning and connect the mold with the vacuum pipeline. The positioning method is manual screw locking or pneumatic automatic locking. The synchronization mechanism can ensure the synchronous lifting of the upper and lower molds to ensure the accuracy of plastic molding;

　　3) Composed of a profile frame, a sealing box, and a protective door. The protective door is divided into automatic and manual;

　　(4) Composed of heating bricks or heating tubes, an oven frame, and a power cylinder or motor;

　　(5) Cooling is composed of air ducts, water pipes, and nozzles;

　　(6) The electrical control cooperates with the pneumatic or hydraulic system to achieve the process requirements (temperature, speed, time) and various program actions of the thermoforming machine.