Covers the proportion of cement covers mold plastic mold covers mold factory in Baoding Lunda building materials being stolen every year up to 18%, not only causing huge economic losses, leaving the "urban traps" is also a security risk to people travel. This new environmentally friendly covers using the new composite materials with high strength, corrosion resistance and other characteristics, no recycling value, and put into use in the construction of the future, at present no one is missing. At the same time, due to reasonable mold design, Manhole, covers more fit, eliminating harsh noise. Visible, environmental protection covers are now building a good covers! In covers mold construction, the progress of such technical content of the mold, optimize product quality, accelerate the pace of energy conservation, etc., that is the main task of the construction of the mold profession. Because the selection of high-performance materials manufacturing mold in use we can choose the appearance of progress in strengthening the skills of its durability. Secondly, this is the shape of the mold that simple little stress during use should pay attention to the protection of the mold, to avoid affecting the onset of post-use mold deformation during use. Also because of the die yield and thus to ensure the durability of the mold in the production process should be used to strengthen the appearance of a low vacuum processing to ensure the life of mold. Only pay attention to those times of doubt on the ability to ensure that details the advantages of mold production increased during follow the mold when the mold production use.