Sheet machine, plastic raw materials performance and usage ( Below)

Plastic has caused a lot of Gospel for machinery industry development, promote the development of most of the machinery. For the plastic machinery, vigorously develops the sheet machine, plastic has played a role in promoting and the effect of raw material supply. Plastic brings this industry and our role, here to introduce the properties and USES of plastics. ( 5) The optical performance is good. Plastic refractive index is higher, and have good luster. Without filling agent of plastic can be made into the products with good sex of pervious to light, such as organic glass, polystyrene, polycarbonate can be made into glittering and translucent and transparent products. Now these plastics has been widely used to make glass Windows, housings, transparent film and optical fiber materials. ( 6) A variety of protective performance. The plastic corrosion resistance, insulation and so on, all reflect of protective plastic for other substances, plastic also has waterproof, moistureproof, prevent radiation, shock and other protective performance, due to these characteristics, its usage in the lunch box machine is very big, but it has also been widely used to produce food, chemical, aerospace, atomic energy industry of packaging materials and protective material. Plastic also exist some disadvantages in the application by certain restrictions. General plastic poor rigidity, such as the elastic modulus of the nylon is about 1/100 of the steel. Plastic heat resistance is poor, in the long time work under the condition of general use temperature under 100 ℃, easy cracking in low temperature. The coefficient of thermal conductivity of plastic only 1/200 of metal - — 1/600, this is a disadvantage for heat dissipation, so the plastic is used as the cup, typically by making a cup of mechanism made disposable paper cups to use. If the load for a long time, even if the temperature is not high, the plastic will gradually produce plastic flow, namely 'creep' phenomenon. Plastic combustion, under the action of light and heat performance is easy to go bad, the ageing phenomenon occurred. So, when choosing plastic should pay attention to foster strengths and circumvent weaknesses.