The manufacturing process of Plastic bottle is a complex and delicate process, which mainly includes the following key steps:
1. Raw material preparation
Plastic bottle is made of thermoplastic plastics, such as polyethylene (PE), polypropylene (PP), polyester (PET), etc. These raw materials first need to be mixed with necessary additives, such as plasticizers, stabilizers, colorants, etc., to ensure that the performance and appearance quality of Plastic bottle meet the requirements. The selection and proportion of raw materials will directly affect the quality and cost of the final product.
2. Bottle embryo preparation
The bottle embryo is the initial form of Plastic bottle, and its preparation mainly adopts two methods: injection molding or extrusion molding.
Injection molding: Inject the preheated and molten plastic into the bottle mold, and use high pressure to fully fill the mold cavity, and form a bottle embryo after cooling. This method is suitable for the production of high-precision Plastic bottle embryos, which can ensure that the size and shape of the bottle embryo meet the design requirements.
Extrusion molding: The heated plastic pressure is extruded through the mold head to form a continuous bottle embryo. This method has high production efficiency and is suitable for mass production.
3. Blow molding
Blow molding is the most critical step to further process the preform into a plastic bottle. In this step, the preform is placed in the mold of the blow molding machine, and the preform is blown up by high-pressure airflow to make it fit the inner wall of the mold. At the same time, the cooling water in the mold is used to quickly cool the preform to solidify and maintain its shape. The blow-molded Plastic bottle has a hollow structure, is lightweight and pressure-resistant.
4. Bottle mouth post-processing
The mouth of the blow-molded Plastic bottle usually needs to be post-processed to meet different usage requirements. Common bottle mouth post-processing includes bottle mouth trimming, bottle mouth reinforcement and bottle cap processing. Bottle mouth trimming is to cut or polish the bottle mouth to make it flat and neat; bottle mouth reinforcement is to add a ring or threaded structure near the bottle mouth to increase its strength and sealing; bottle cap processing is to make threads or other structures on the bottle mouth to facilitate cooperation with the bottle cap.
Through the above steps, Plastic bottle can be transformed from raw materials into finished products and is widely used in food, beverages, cosmetics and other fields. With the continuous advancement of science and technology and the improvement of environmental awareness, the manufacturing process of plastic bottles is also constantly innovating and improving to meet market demand and environmental protection requirements.
