Common vacuum forming machine

Vacuum forming process

by:Mengxing     2021-04-09

The vacuum blister molding process is a thermoforming processing method. A method of manufacturing open shell products using thermoplastic sheets. The plastic sheet is cut into a certain size and heated and softened. With the help of the air pressure difference or mechanical pressure on both sides of the sheet, it is deformed and covered on a specific contour surface of the mold. After cooling and shaping, the edges are trimmed.
Vacuum blister molding is a molding method that relies on vacuum force to stretch and deform the sheet. Vacuum force is easy to realize, master and control, so simple vacuum forming is the earliest and most widely used thermoforming method.

Technical background At present, the vacuum forming process is widely used in forming equipment for blister products, all of which adopt the traditional vacuum forming process. In the production of products with complex surface shapes in this way, sheets and molds often do not fit tightly, resulting in inadequate molding of local areas, low product qualification rate, long molding time, low production efficiency, and high cost. SUMMARY OF THE INVENTION The purpose of the present invention is to provide people with a high-efficiency, high-quality, and low-cost vacuum forming process for compression in view of the existing defects. In the vacuum forming process of the present invention, the mold is evacuated and compressed air is added to the sealed chamber for compression. Through the combined action of the negative pressure inside the mold and the positive pressure outside, the heated and softened plate can be closely attached to the complex shape. On the surface of the forming mold. The compressed air pressure in the sealed chamber is 1.8 bar 3.5 bar. The plate that is softened by heating is a plastic plate. The effect of the present invention The present invention is used for blister products, especially for the molding of blister products with complex shapes. It not only improves the product qualification rate and production efficiency, reduces the thickness of the plate, but also improves the automation performance of the molding equipment.


Specific implementation of vacuum forming blister process
Before forming, the forming mold 1, the upper frame 2 and the lower frame 3 are mounted on the vacuum forming machine. The joint surfaces of the mold 1 and the lower frame 3, and the upper frame 2 and the sealed chamber 4 have sealing strips to meet the forming and sealing requirements. After the mold is installed, the plastic sheet 5 is put into the forming machine and heated, and the surface temperature of the plastic sheet is heated to 200. After C, move to between the upper frame and the lower frame and the mold. The upper and lower frames are combined to clamp the plastic sheet. The vacuum device draws out the air in the sealed chamber, so that the heated and softened plastic sheet is bulged upward to complete the bubble absorption. Then, the mold 1 moves upwards in place, the vacuum device draws out the air between the plastic sheet 5 and the mold, the vacuum degree is ^0.07Mpa, and the pressure device blows compressed air into the sealed chamber 4 for compression, the pressure is 1.8 bar 3.5 bar, Under the combined action of the negative pressure inside the mold and the positive pressure outside, the plastic sheet 5 closely adheres to the surface of the mold 1, and the cooling system cools and finalizes the product, which completes the entire molding process.
Rights request
1. A vacuum forming process for compression, which is characterized in that in the vacuum forming process, compressed air is added to the sealed chamber while the mold is vacuumed for compression, through the combined action of the negative pressure inside the mold and the positive pressure outside the mold , So that the heated and softened plate is closely attached to the surface of the forming mold with complex shape.
2. A vacuum forming process for compressing air according to claim 1, characterized in that the pressure of the compressed air added into the sealed chamber for compressing is 1.8 bar to 3.5 bar.
3. A vacuum forming process for pressing air according to claim 1, characterized in that: the heated and softened sheet is a plastic sheet.

The vacuum forming process involves a vacuum forming process that performs compression. It is characterized in that during the vacuum forming process, the mold is evacuated and compressed air is added to the sealed chamber for compression. The negative pressure inside the mold and the external positive pressure The combined effect of pressure makes the heated and softened plate closely adhere to the surface of the forming mold with complex shapes. The invention is used for blister products, especially for the molding of blister products with complex shapes, which not only improves product quality and production efficiency, reduces production costs, but also improves the automation performance of molding equipment.
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