Conveyor will appear in the course of ditches , thus affecting the use of this problem arises only two reasons : First, the formula ; Second process ; said first recipe : refers to the side glue recipe , its poor liquidity , and gum paste and plastic cover can not be achieved covulcanization ; say craft ; refers conveyor belt material molding process, irregular strip side , top gel process is not required to do , side glue and there is a gap between the strip , causing the problems mentioned above ; finally curing process : there is no problem if the above two aspects , in the curing process , a groove width and compression ratio also appear to grasp unfit ditches and side glue edge Void phenomenon.

 1 . Shang Hao plus side glue without compression ratio is too small, resulting in lack of material

2 . No Shanghao side glue penetration resulting from the formation of silicone oil separation interface

1 ) Oxygen : Oxygen rubber in the rubber molecules with a radical chain reaction , molecular chain breakage or excessive cross-linking , causing changes in rubber properties . Oxidation is a major reason for the aging of rubber .

 2 ) ozone, oxygen chemical activity is much higher than that , more destructive , it is also the molecule chain was broken , but the effects of ozone on the case with rubber or deformation of rubber and different. As for the deformation of the rubber ( mainly unsaturated rubber ) occurs when the stress in the direction perpendicular to the crack , the so-called " ozone cracking " ; acting on the deformation of the rubber , not only the oxide film formed on the surface cracking.

 3 ) Heat : raising the temperature may cause thermal cracking of rubber or thermal crosslinking . However, the basic effect of heat or activation. Improve oxygen diffusion and activation of the oxidation reaction speed , thereby accelerating the oxidation reaction rate of the rubber , which is a common practice of aging - thermal aging .

 4 ) Light: light is shorter, the greater the energy . From the damaging effects of the rubber is high energy ultraviolet light. In addition to direct UV- strand breaks caused by rubber molecules and crosslinking , the rubber due to absorption of light energy to produce free radicals to initiate and accelerate the oxidation chain reaction process . Plays a role in UV heating . The role of the other characteristics of light ( and heat different role ) is that it mainly in the rubber surface of the Ascent . Gel sample rate , net cracks will appear on both sides of the so-called " light outer crack ."

 5 ) mechanical stress : the conveyor belt in action as well as repeated mechanical stress and the constant friction roller process , will make the rubber molecular chains generate free radicals induced oxidative chain reaction , forming force chemical processes. Mechanical rupture of molecular chains and mechanical activation oxidation process. Which can be dominant, depending on their geographical conditions. In addition, under stress prone to ozone cracking .

 6 ) Water : the role of water has two aspects : rubber rain or humid air immersed in water, easily damaged , which is due to the rubber material and the water -soluble groups and other ingredients were dissolved in water, extracted . Hydrolysis or absorption causes. In particular, is immersed in water and the atmosphere under the action of alternating exposure , will accelerate the destruction of the rubber . However, in some cases, water is not destroy the rubber , and even delay the effects of aging .

 7 ) Other: on rubber factors include chemical media , variable valence metal ions , high-energy radiation, electrical and biological .