Contact Us
The Basic Concept Of Plastic

The Basic Concept Of Plastic

The basic concept of plastic:

1. The definition and composition

Plastic generally refers to a material which has a plastic synthetic resin as a main component, has plasticity and fluidity under a certain temperature and pressure, can be molded into a certain shape, and maintains a shape under certain conditions.

Composition: polymer synthetic resin (40 ~ 100%)

Auxiliary materials: plasticizers, fillers, stabilizers, lubricants, colorants, foaming agents, reinforcing materials. 

Auxiliary materials is able to improve the performance and processing properties of materials, saving plastic resin (expensive)

2. Classification of plastics:

There are more than 300 varieties plastics in the world, but only around 40 kinds are commonly used.

It is called by the name of the main synthetic resin: polyethylene, polypropylene, polyvinyl chloride, phenolic resin, oxygen resin, commonly known as: bakelite (phenol-formaldehyde resin), plexiglass (polymethyl methacrylate), glass reinforced plastic ( Thermosetting resin reinforced with glass fiber), English name is nylon (polyamide) PA, polyethylene PE

Classification of plastics: Thermoplastics and thermoset plastics (by molecular structure of plastics)

A. Thermoplastics

The linear molecular chain has a scaffold structure and is soften after heating, but cooling and solidification is irreversible.

B.Thermoset plastics

It has a network molecular chain structure and is soften after heating, solidification is irreversible.

General plastics: Refers to a type of plastic with large output, wide application and low price. Such as: polyethylene, polypropylene, polyvinyl chloride, polystyrene, phenol-formaldehyde resin, amino plastics etc., accounted for 60% of plastic production.

Engineering plastics: Refers to a type of engineering materials that have high mechanical properties and can replace metals, such as Nylon, polyphosphate, POM, ABS etc.

C. Properties of Plastics

a. Light weight, density 0.9~0.23g /cm^ ; Foaming plastic 0.189g/cm

b. High strength: 1/10 of the strength as metal materials. Fiber glass material strength is higher.

c. Good chemical stability

d. Excellent electrical insulation performance

e. Good thermal insulation

f. Easy to form and process compare to metal.

g. Insufficient: Strength, rigidity is not as good as metal, not heat resistant. The thermal expansion coefficient is large under 100 degrees Celsius, shorter life than metal.

Related News
  • High-Precision Mould Design

    High-Precision Mould Design

    April 21, 2020This paper introduces a mould design of thick plate, high strength and high precision, systematically analyzes and calculates the blank size, and expounds the influence of forming, flanging, dimension...view
  • Classification of CNC Plastic Mold

    Classification of CNC Plastic Mold

    October 28, 2019There are many kinds of CNC plastic molds, which can be classified according to forming material, forming process, loading and unloading mode, cavity number, parting surface characteristics, forming p...view
  • The United States Lifts Tariffs On Injection Moulds In China

    The United States Lifts Tariffs On Injection Moulds In China

    October 28, 2019In late December, the Trump administration unexpectedly suspended a 25% tariff on injection moulding companies china moulds, decision analysts said could hurt U.S. moulding manufacturers, but would he...view
  • The Method of Family Mold Injection Molding

    The Method of Family Mold Injection Molding

    May 26, 2020Injection molding of household mould is a method of injection and molding. It has advantages of fast production speed, high efficiency, automatic operation, design varieties, simple to complex shapes,...view
  • Injection Moulding Method

    Injection Moulding Method

    April 21, 20201. The vented injection machine used for degassing injection moulding is equipped with an exhaust port in the middle of the barrel, which is also connected to the vacuum system. When the plastic is pl...view
  • Advantages of Chinese Mould Enterprises

    Advantages of Chinese Mould Enterprises

    October 28, 2019China Mould Company has obvious advantages in labor cost and equipment scale. On average, employees of China mould company work more than two hours a day than those of German mould enterprises, and th...view
Plastic Injection Moulds
Plastic Parts Gallery