First, the production process of molding cover:
The molded bottle cap has no material mouth trace, which is more beautiful, with low processing temperature, small shrinkage and accurate bottle cap size. Put the mixed materials into a compression molding machine, heat the materials to about 65438 070 degrees Celsius in the machine to become semi-plasticized, and quantitatively extrude the materials into the mold. The upper and lower grinding tools are closed, and the bottle cap pressed into the bottle cap shape in the mold is left in the upper mold;
The lower die is removed, the bottle cap passes through the turntable, and the bottle cap is removed from the die counterclockwise according to the internal thread. After molding, rotate the bottle cap on the machine, and cut the anti-theft ring connected with the bottle cap at the edge of the bottle cap by 3 mm with a blade.
Second, the production process of injection molding cover:
The injection mold is bulky and troublesome to replace. Injection molding needs more pressure to produce multiple bottle caps, and the higher the heating temperature of the material, the higher the energy consumption than compression molding. Put the mixed material into an injection molding machine, heat the material to about 230 degrees Celsius in the machine to become semi-plasticized, inject it into the mold cavity of the abrasive tool through pressure, and cool and set.
The cooling shrinkage grinding tool of the bottle cap rotates counterclockwise, and the bottle cap pops out under the action of the push plate, so that the bottle cap automatically falls off. Using thread rotation demoulding can ensure the complete molding of the whole thread and effectively avoid the deformation and scratch of the bottle cap. After cutting the anti-theft ring and installing the sealing ring in the bottle cap, a complete bottle cap is made.
Extended data
The main difference between the two.
1, the injection mold is bulky and it is troublesome to replace a single mold cavity; Each cavity formed by compression molding is relatively independent and can be replaced separately.
2. The molded cover has no gate, which makes the appearance more beautiful and the printing effect better;
3. Injection molding fills all 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 molding cover needs to heat the material to a molten state, and the temperature is about 220 degrees; The 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 molded cover;
5, the molding temperature is low, the shrinkage rate is small, and the size of the cover is more accurate.