The bottle cap is fastened on the bottle mouth through cooperation with the bottle mouth, which is to prevent the leakage of the material in the bottle and the invasion of external bacteria. After the bottle cap is tightened, the mouth of the bottle goes deep into the bottle cap and reaches the sealing gasket. The internal groove of the bottle mouth and the thread of the bottle cap are in close contact with each other, providing pressure for the sealing surface. Several sealing structures can effectively prevent the substances in the bottle from seeping through. Leakage or deterioration. There are many strip-shaped anti-slip grooves on the outer edge of the bottle cap, which is convenient for increasing friction when opening the cap. There are two main types of plastic bottle cap production:
1. Production process of compression molded bottle caps
Compression-molded bottle caps have no traces of the material mouth, which looks more beautiful, the processing temperature is low, the shrinkage is small, and the size of the bottle cap is more accurate. The upper and lower abrasive tools are molded together, and the bottle cap is pressed into the shape of the bottle cap in the mold. The bottle cap formed by compression molding stays in the upper mold, the lower mold is removed, the bottle cap passes through the rotating disk, and the bottle cap is removed from the mold in a counterclockwise direction according to the internal thread. down.
2. Production process of injection molded bottle caps
Injection molds are bulky and troublesome to replace. Injection molding requires higher pressure to mold multiple bottle caps, and the heating temperature of materials is higher, which consumes more energy than compression molding. Put the mixed material into the injection molding machine, heat the material to about 230 degrees Celsius in the machine to become a semi-plasticized state, inject it into the cavity of the mold through pressure, and cool it to shape. After injection, the mold is twisted upside down to allow the cap to fall out. The bottle cap cooling and shrinking mold rotates counterclockwise, and the bottle cap is ejected under the action of the push plate to realize the automatic fall off of the bottle cap. The thread rotation demoulding can ensure the complete molding of the entire thread, which can effectively avoid the deformation and scratch of the bottle cap. hurt.
The bottle cap also includes an anti-theft collar (ring) part. That is, after the cap part is made, the anti-theft ring (ring) is cut, and a complete bottle cap is produced. The anti-theft ring (ring) is a small circle under the bottle cap, also called a one-time broken anti-theft ring, the anti-theft ring will fall off and stay on the bottle after unscrewing the lid, through which you can judge whether a bottle of water or a bottle of beverage is complete It was still opened.
Post time: Sep-22-2023