Plastic bottle caps are generally divided into two types of production processes: compression molding cap production process and injection molding cap production process compression molding cap production process: the suction machine sucks the mixed material into the barrel of the compression molding machine. After the inner heating to the semi-melt plasticized state, it is extruded into the mold cavity quantitatively, the upper and lower molds are closed, compression molded and cooled to set, demold, and then through the ring cutting and padding to complete the production of compression molded caps. Plastic cap compression molding machine is used for cap compression molding process.

Production process of injection molding cover: The suction machine sucks the mixed material into the barrel of the injection molding machine, heats it to the molten plasticized state in the barrel, and then injects it into the mold cavity, cools the mold in the cavity, releases the mold, and then After cutting the ring and adding pads, the production of injection caps is completed.

The main difference between the two

1. The injection mold has a large volume, and it is troublesome to replace a single cavity; each cavity of compression molding is relatively independent and can be replaced separately.

2. There is no pouring point for the compression molded cover, which has a more beautiful appearance and better printing effect;

3. Fill all the mold cavities at one time with injection, and extrude one cap material at a time with compression molding. Compression molding extrusion pressure is very small, and the pressure required for injection molding is relatively high;

4. The injection-molded cover needs to heat the material to a molten flow state with a temperature of about 220 degrees; the compression-molded cover only needs to be heated to about 170 degrees, and the energy consumption of the injection-molded cover is higher than that of the compression-molded cover;

5. The compression molding temperature is low, the shrinkage is small, and the size of the cover is more accurate;