第一阶段产品为方型，顶部和底部略小，若是分开就是上下两个梯形。加工时先加工出来两个凹槽状的模型，再把它们合在一起，即成为一个成品。这种产品解决了传统产品不耐腐蚀，易渗漏堵塞的缺点，但是严密性还不够好，抗压性也一般，无法制作大型产品。
The first stage of product is the side, top and bottom is slightly smaller, if separate upper and lower two ladder. Two grooves are processed in the process of processing, and then they are combined together to become a finished product. This product solves the shortcomings of traditional products, such as no www.laoniangongyu58.com www.bdaxj.com www.baodingmenchuang.com www.jiasenmenchuang.com www.sanhumenchuang.com www.yongxingmenchuang.comcorrosion resistance, easy leakage and blockage, but the tightness is not good enough, and the compression resistance is also general, so it can not make large products.
第二阶段产品基本为横卧的圆柱体，但顶部和底部还是设计为平面。车轮状凹凸面封头开始使用。因为是筒状模具，这一阶段的产品一般采用对接的方法连接结合。这种产品的抗压性能要比第一阶段的好，但是产品的严密性还可以再加以改良，而且这种产品的加工程序复杂，不利于工厂化生产。
The second stage product for the horizontal cylinder, but the top and bottom is designed into a plane. The wheel - shaped concave convex head begins to use. Because of a cylindrical mold, the product of this stage is usually connected by a butt connection. This product has better compression performance than the first stage, but the tightness of the product can be further improved, and the processing program of this product is complex, which is not conducive to factory production.