Longitudinal waves rarely in canvas core conveyor belt appears, often in nylon, EP core and other synthetic fiber with core appears. Shrinkage nylon and polyester fiber is heated, the fabric internal voids dipped after the few, is not easy to be compressed. Vulcanized nylon cloth and EP compressed to flat in the central axis extends to both sides, when the iron pad can not expand, will form a longitudinal waves.

Solution: (1) students with width less than the width of finished product, finished product width of 99%; (2) curing mold iron width should be appropriate to relax than width of finished products, such as the 1000mm width of the belt vulcanizing, mold width can be relaxed to 1010 ± 5mm; (3) increase the curing pressure, the general should be 2.5-3mpa left and right (nylon core or EP core); (4) students belt vulcanizing stretching should not be too large, suitable for 1%-2%, as the canvas heat shrinkage rate and size; (5) increase the nylon cloth, EP cloth adhesive thickness. As resistance to tropical, adhesive thickness is thicker than ordinary belt, which not only can prevent the defects of appearance quality, but also can increase the interlaminar adhesion force, especially in the EP core operating in high temperature zone, EP canvas if the adhesive thickness is not enough, in the process of operation is often easy to cause gum with cloth or cloth and 布脱 layer. And the nylon core and canvas core is the core layer hardness of small, soft, seldom appear this kind of circumstance.