The production process of plastic bottle caps

What is the production process of plastic bottle caps?

There are many plastic products that we come into contact with in life. The bottle cap is the most familiar to us. The bottle cap is fastened on the bottle mouth through the cooperation with the bottle mouth to prevent the leakage of the material in the bottle and the invasion of bacteria from the outside. Plastic bottles The production and processing process of the cap is similar to the requirements of the bottle body. The difference is that the main raw material of the bottle body is blow molding grade, while the main raw material of the bottle cap is injection molding grade. So, what is the production process of the plastic bottle cap?

1. Feeding. The batch material is mainly transported to the hopper of the injection molding machine by the pipeline. After the machine is turned on, the material in the hopper enters the material barrel to complete the process of feeding the machine.

2. Plasticization is a process in which the plastic batch entering the barrel from the hopper is heated in the barrel to reach a fluid state and have good plasticity. Its requirement is that the plastic reaches the specified molding temperature before entering the mold cavity, and a sufficient amount of molten plastic is provided within the specified time.

3. In the first injection, the well-plasticized melt is injected into the mold under the push of the screw (injection process). When the melt is injected into the cavity, it must pass through the nozzle, main (sub) runner, and gate, with great resistance , The injection pressure loss can reach 30%-70%, so the process requires a sufficient injection pressure to ensure complete mold filling. Then comes the molding stage, that is, the 4 steps of discarding the mold, compacting, backflowing and gate curing. The plastic melt injected into the mold cavity is cooled and shaped into a plastic cover.

4.Cooling and demoulding. It mainly refers to the stage from the complete freezing of the plastic at the gate to the release of the lid from the mold. The demoulding can be divided into two ways: strong stripping and spin stripping.

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