According to the production process: it can be divided into injection-molded cover and compression-molded cover. The production process of injection-molded cover is as follows: The suction machine sucks the mixed material into the barrel of the injection molding machine, heats it in the barrel to melt and plasticize, and then injects it into the mold The mold cavity is cooled and shaped in the mold cavity, demolded, and then the ring is cut and cushioned to complete the production of the injection molded cap. Representative manufacturers of injection molding cap machinery include HUSKY from Canada and Saxilon from Zhejiang, China.
The production process of the compression-molded cap is as follows: The suction machine sucks the mixed material into the cylinder of the compression molding machine, heats it in the cylinder to a semi-molten and plasticized state, and then extrudes it quantitatively into the cavity of the mold, and the upper and lower molds are closed, Compression molding, cooling and shaping, demoulding, and then ring cutting and padding to complete the production of compression molding caps. Representative manufacturers of compression-molded cap machinery include Italy’s Sacmi and China’s Guangzhou Jingpin.
Comparison:
(1) Injection molding caps need to heat the material to a molten flow state, and the temperature is about 250°C; compression molding only needs to be heated to about 180°C, and the energy consumption of injection molding caps is higher than that of pressure injection caps;
(2) The processing temperature of compression molding is higher Low shrinkage, small shrinkage, and more accurate cap size;
(3) Injection molding fills all mold cavities at one time, and compression molding extrudes one bottle cap material at a time. The extrusion pressure of compression molding is very small, while the pressure required for injection molding is relatively high;
(4) The injection mold is large in size, and it is troublesome to replace a single cavity; each cavity of compression molding is relatively independent and can be replaced separately;
(5) Compression molding cover The injection molding machine is a special machine for bottle caps, which has a special mold release design for bottle caps; bottle cap injection molding machines basically do not have a special design for bottle caps, so the compression-molded caps can be made into bell mouths, and the cap hanging rate is high, and users like to use them.
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