Generally speaking, the production process of plastic caps can be roughly divided into two kinds: the production process of pressure plastic caps and the production process of injection caps
First, the production process of pressure plastic cover:
The pressure plastic bottle cap has no traces of material opening, which looks more beautiful. The processing temperature is low, and the size of the bottle cap is more accurate. The mixed material is put into the press molding machine, the material is heated to about 170 degrees Celsius in the machine into a semi-plasticized state, and the material is quantitatively extruded into the mold. The upper and lower abrasive mould is closed, and the bottle cap is pressed into the shape of the bottle cap is molded into the upper mould;
The lower die is removed and the cap is removed from the die counterclockwise by the inner thread as it passes through the rotating disc. After the bottle cap is molded and rotated on the machine, a blade is used to cut the bottle cap into an anti-theft ring connected by multiple points at the edge of 3mm.
Two, the production process of injection cap:
Injection mold volume is large, the replacement of trouble, injection molding per mold out of multiple caps requires greater pressure, material heating temperature is higher, energy consumption is higher than pressure plastic. Put the mixed material into the injection molding machine, heat the material to about 230 degrees Celsius in the machine to become semi-plasticized state, through the pressure injection into the abrasive cavity, cooling finalize.
The bottle cap cooling shrinkage grinding tool rotates counterclockwise and pushes the bottle cap out under the action of the pushing plate to realize the automatic fall off of the bottle cap. The screw rotation demoulding can ensure the complete forming of the whole thread and effectively avoid the deformation and scratch of the bottle cap. After cutting the anti-theft ring and putting the seal ring in the bottle cap, a complete bottle cap production is completed.