Application of SMC Material in Manhole Manhole Cover

The city road starts with the use of cast iron parts. Although there are many advantages to the cast iron parts, there are the following problems: the cast iron parts are often lost in the process of use, resulting in accidents often occur; there are parts of the surface area of the larger cast iron cover impact resistance is poor, driven The impact of the vehicle is easy to cause fragmentation; cast iron covers by the climate greater impact on the climate in the winter and summer temperature changes in the larger area of the cast iron covers thermal expansion coefficient is larger, with loose, easy to drive vehicles knocked; Structure self-locking structure, can only change some of the performance, but easy to lose; by the impact, easy to cause the phenomenon of rupture is difficult to overcome.

So people began to study the replacement of cast iron products of polymer composite products. The market also appeared in many use of waste plastics or other polymer composite materials such as the production of manhole covers. The use of polymer composite materials to produce Yin Jinggai series of products, must have the following advantages: ① has a high strength, stiffness; ② in the heat, stress state is not deformed, no rupture; ③ has a high wear resistance, heat (4) The molding process is good, the shrinkage rate is low, the dimensional stability is good; ⑤ Molding pressure is low, the manufacturing process is simple, the material source is wide and the price is low; ⑥ Has the non-recyclable performance, anti-theft (non-recyclable). The use of SMC materials produced by the manhole covers with its excellent performance quickly become the mainstream of such products. Such products in many cities by the trial, a variety of performance to achieve the performance of Yin Jinggai, while both environmentally friendly and anti-theft, the market is huge, is worth promoting the product. So SMC materials in the city road with a manhole cover on the application of a good market.