Would have been worn, cut , with a core local damage or bandwidth reduction for renovation of the old conveyor belt , conveyor belt can be turned into a conveyor belt can be re-used . Conveyor belt repair renovation and refurbishment is also divided into two categories,

Old conveyor experience, income , according to the size change , hunting degree lacerations size is divided into three :

Class A plastic cover aid for wear, but not Lu Bu . No penetrating injury, effectively the same as the width of the original product ;

B grade conveyor belt surface portion Lu Bu ( 5 per cent . Effective width without reduction ;

Class C Lu Bu part more effectively reduced width <50mm;

The use of recycled rubber rubber products manufacturing

Reclaimed rubber vulcanization process refers to the formation of cs, s- crosslinks cut off , but still retains its original composition of the rubber . Such reuse method developed rapidly after World War II . But by the 1970s , with the emergence of radial tires , reclaimed rubber mixed with a significant decline in the proportion ; filled SBR synthetic rubber , especially to low-cost advantages claimed most of the reclaimed rubber market ; addition , reclaimed rubber production capacity consumption of large , three wastes "treatment is difficult, unable to adapt to environmental requests. these reasons make reclaimed rubber production gradually decline, developed using the focus has shifted to manufacture rubber powder and open other applications, such as the United Kingdom has fully stopped reclaimed rubber production , the United States only two factories producing reclaimed rubber , but for lack of resources, raw rubber and labor costs are not high in developing countries and regions , production is the use of recycled plastic is still the primary means of waste rubber .

Vulcanizates regeneration mainly desulfurization, that does not destroy the CC bond in the case of interrupted SS, CS bond between the components, formed during the vulcanization destruction crosslinked spatial network structure , cutting portion and part of the long-chain crosslinking , the molecular weight reduction , the elasticity of vulcanized rubber into the plastic , and it has the ability to re- vulcanization . Desulfurization method used so far have failed to be restored to the original vulcanized gum levels and will inevitably break interrupted while CS bond C - C bond , so that the physical properties of recycled rubber to reach the native gum levels.

Vulcanized rubber desulfurization regeneration reduction , thermal depolymerization , oxidation , mechanical effects and other effects integrated results.

A mechanical action

Mechanical energy can damage the CS, C eleven gross molecular chain , resulting rubber molecules cross- linked structure is cut off. Grinding can also molecules associating with the surface of carbon black to open disposition , the majority of these faults occurs at a lower temperature .

2 thermal effect .

Heat can accelerate the molecular motion , which leads to the breaking of molecular chain of about .80 ℃ significant thermal cracking occurs , 1500C around the cleavage speed, then the temperature is increased 100C, pyrolysis rate can be doubled .

After pyrolysis , pyrolysis molecular end there with the reactive free radicals.

3 the role of oxygen

The presence of oxygen in the rubber to produce hydrogen peroxide depolymerization , so that the molecular chain broken more accelerate the cleavage rate . At the same time , cracking generated again with active radicals . Will make cracking slower. The side chain double bond of vulcanized rubber , the slower the cleavage .

According to preliminary grading decide whether refurbishment and renovation type. Then carried out on the original product category with a core , tensile strength, adhesion strength and other physical testing, to further determine whether renovation , refurbishment determine the type and use of raw materials

All that can be refurbished stripped plastic cover on the need of repairs, as long as the stripped portion of the plastic cover . After stripping conveyor belt and then polished to remove the rubber band core excision with residual core corrosion or broken parts , painted mortar, dry lamination has eraser canvas , and finally paste Xiao plastic cover . Then use the flat or low temperature steam vulcanization vulcanization , and then repair processing was refurbished products.

Refurbished conveyor belt performance is basically the same with the new life close to the new band , and can replace the new belt , and with lower cost than new . Refurbished conveyor performance as shown in Table 16-9 .

Although the renovation will extend through the life of rubber products , but also limited the number of renovations these rubber products eventually become waste .