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[Chemical Knowledge]：Polyurethane downstream production and manufacturing methods and processes.

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The downstream manufacturing method
of polyurethane
Polyurethane (PU) is a polymer material widely used in the field of chemical production, with excellent physical properties and chemical stability. In the downstream manufacturing process of polyurethane, different manufacturing methods can be used to prepare polyurethane products with different shapes and properties to meet the needs of different fields. This article will introduce several common polyurethane downstream manufacturing methods.

1. Injection molding

injection molding is a polyurethane raw materials into the mold, through heating, pressure and other technological means, so that the raw materials in the mold rapid reaction molding method. The method is suitable for producing various polyurethane products with complex shapes and precise dimensions, such as soles, seals, cushions, etc. Injection molding has the advantages of high production efficiency and stable product quality, but the equipment investment is large.

2. Extrusion molding

extrusion molding is a method in which polyurethane raw materials are extruded through an extruder head. It is often used to produce pipes, bars, profiles, etc. This method has the advantages of high production efficiency and low cost, but the length of the product is limited by the equipment.

3. Calendering molding

Calendering molding is a method in which polyurethane raw materials are placed on a calender and reacted between rollers through the pressure and temperature of the rollers. This method is suitable for the production of polyurethane films and sheets with large area and uniform thickness. Calendering has the advantages of stable product quality and high production efficiency, but it requires high equipment accuracy and operation technology.

4. Spray molding

Spray molding is a method in which polyurethane raw materials are sprayed on the surface of an object through a spray gun to form a certain thickness of polyurethane coating. This method is suitable for surface coating treatment of various substrates, such as construction, automobiles, furniture and other fields. Spray molding has the advantages of convenient construction and high efficiency, but it requires high operation technology.

In short, different polyurethane downstream manufacturing methods have different characteristics and scope of application. Choosing the appropriate manufacturing method according to specific product requirements and production conditions can improve production efficiency, reduce costs, and obtain high-quality polyurethane products. At the same time, with the continuous progress and innovation of science and technology, the downstream manufacturing methods of polyurethane are also constantly developing and improving, injecting new vitality into the development of chemical production field.

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