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[Chemical Knowledge]：Manufacturing method and process of plastic products

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Manufacturing methods
of plastic products
1. Introduction

With the continuous development of science and technology, plastic products have become an indispensable part of our daily lives. From food packaging to building materials, plastic products are everywhere. This article will detail the manufacturing methods of plastic products in the field of chemical production raw materials.

2. raw material selection

1. plastic resin: plastic resin is the main raw material for the manufacture of plastic products, common polyethylene, polypropylene, polyvinyl chloride, polyester, polycarbonate and so on.
2. Additives: In order to improve the performance of plastic products, it is necessary to add some auxiliary materials, such as plasticizers, stabilizers, antioxidants, lubricants, etc.

3. preparation process

1. Mixing: The plastic resin and additives are mixed in proportion, usually using a high-speed mixer or internal mixer.
2. Plasticization: The mixed raw materials are heated and plasticized to make them fluid and easy to process.
3. molding: the plasticized raw materials are molded into the desired shape of the product through the mold. Common molding methods include injection molding, extrusion molding, blow molding, etc.

4. injection molding process

injection molding is one of the commonly used methods in the manufacture of plastic products. The following are the main steps:

1. Feeding: Add plastic particles to the hopper of the injection machine.
2. Plasticization: The injection machine heats the barrel to melt the plastic particles and have fluidity.
3. Injection: The molten plastic is injected into the mold cavity.
4. Holding pressure: maintain a certain pressure in the cavity to make the product dense.
5. Cooling: Cooling the mold through the cooling water channel to solidify the product.
6. Demoulding: Open the mold and remove the product.

5. extrusion molding process

extrusion molding is suitable for the manufacture of pipes, profiles and other continuous length of plastic products, the following are the main steps:

1. Feeding: the plastic particles into the extruder hopper.
2. Plasticization: The extruder heats the barrel to melt the plastic particles and have fluidity.
3. Extrusion: The molten plastic is extruded through a screw to form a continuous length of product.
4. Cooling: The product is cooled by water cooling or air cooling to solidify it.
5. Traction: The product is led out by the traction equipment and cut or wound.

6. blow molding process

blow molding is suitable for manufacturing hollow products, such as bottles, cans, etc. The following are the main steps:

1. Feeding: Add plastic particles to the hopper of the extruder.
2. Plasticization: The extruder heats the barrel to melt the plastic particles and have fluidity.
3. Parison Extrusion: The parison is extruded through an extruder head.
4. Blowing: The parison is blown by compressed air to make it close to the inner wall of the mold.
5. Cooling: Cooling the mold through the cooling water channel to solidify the product.
6. Demoulding: Open the mold and remove the product.
After-treatment
of
7. products After the manufacture of
plastic products, some post-treatment is usually required to improve their performance or appearance quality, such as heat treatment, polishing, printing, etc.

8. conclusion The manufacturing methods of

plastic products are varied, and different molding processes are suitable for manufacturing different types of plastic products. In the production process, it is necessary to select the appropriate raw materials and processes to ensure the quality and performance of the products. With the continuous advancement of science and technology, the manufacturing methods of plastic products will continue to be improved and optimized.

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