1 Under certain load and driving conditions, the tire of the forklift has a suitable tire pressure. When the tire pressure is lower than the standard value, the radial deformation of the tire increases, and excessive deflection occurs on both sides, so that both sides of the crown are grounded. The inner wall of the sidewall is pressed, the outer wall of the sidewall is pulled, and the cord in the tire body is subjected to large deformation and alternating stress. Periodic compression deformation will cause fatigue damage of the rewinding cord, which will increase the relative slip between the ply of the tire and the tire and the ground, increase the heat generated by the friction, and the temperature of the tire will rise sharply, which will reduce the tensile strength of the rubber. The cord is loose and partially delaminated, and when it is hit by an obstacle, a puncture occurs. The uneven pressure on the tread causes severe wear on the shoulder portion, resulting in a "bridge effect" in which the tread is toothed or wavy. Tire pattern recesses are easily embedded in nails and stones on the road, causing mechanical damage. The rolling resistance of the carcass is increased and the fuel consumption is increased. Tests have shown that when the tire pressure is lower than 20%-25% of the standard value, the fuel consumption is increased by 20%. When the tire pressure is higher than the standard value, the center of the crown is grounded, the contact area between the tire and the road surface is reduced, the load per unit area is increased, and the wear in the middle portion of the crown is intensified. The cord of the tire is excessively stretched, the stress of the carcass cord is increased, the fatigue process of the cord is accelerated, and the cord is broken, causing the tire to burst in the early stage.
2 Under certain load and tire pressure, the vehicle speed increases, the deformation frequency of the tire, the vibration of the carcass and the circumferential deformation of the tire and the lateral distortion (formation of static waves) increase, and the heat generated by friction per unit time increases. The performance of the tires is degraded, and even ply cracking and tread peeling occur, which accelerates the wear and damage of the tire.
3 Under a certain tire pressure, the tire overload will increase its flexural deformation, and the stress of the cord and the cord will increase, which will easily cause the cord of the sidewall to be broken, loose and delaminated, and the force of the carcass cord will be Exceeding the design allows stress and tire grounding pressure, the heat generated increases, the carcass temperature rises, and the load carrying capacity decreases. At the same time, wear is caused by the contact between the shoulder and the ground, especially in the case of obstacles, even a small stone will cause the crown to blast. Practice has proved that when driving on turning and uneven roads, when the tire load exceeds 20%, the mileage will be shortened by 35%; when it exceeds 50%, it will be shortened by 59%; when it exceeds 1%, it will be shortened by more than 80%.
4 Road conditions have a great influence on the service life of the tire, which affects the friction between the tire and the ground and the dynamic load on the tire.
5 high temperature will reduce the tear strength, elongation and hardness of the rubber, which will reduce the adhesion strength between the rubber and the cord, and also accelerate the aging of the rubber. For tires that are exposed to high temperatures, especially those that have aged, it is easy to tear the crown pattern when it is slipped or rolled over an obstacle. Cracks in the carcass rubber and severe deformation of the sidewall cause the carcass layer cord to separate from the rubber. Once the tire partially encounters a sudden load, it is likely to have a puncture.
6 When the tire is subjected to grease, acid and alkali corrosion and long-term high temperature, the physical and chemical properties of the tire will change, the bearing capacity will be greatly reduced, and the tire will be easily blown out during use. In addition, the oil-corroded tires may show blockage of the sealing layer, small area rubber peeling off of the tire mouth, and separation of the carcass cord from the rubber. Since the patch does not have affinity with the oil-containing rubber, even if the damage to the tire is small, the possibility of repair is lost.
7 Due to the different load distribution of the front and rear axles, the different working characteristics of the driving wheel and the steering wheel and the difference of the road surface conditions, the wear status of each tire is inconsistent. If the same axle is not replaced with the same factory, the same size, structure, level and pattern The tires will accelerate the wear of the tires.
8 In use, if you do not pay attention to reasonable matching and regular transposition, resulting in uneven load on the tire, it will accelerate tire wear.
The main function of the edge banding is to seal the cross-section of the board, so as to avoid the damage of the board and the adverse factors (mainly moisture) in the process of use and prevent the formaldehyde inside the board from volatilizing, and at the same time achieve the effect of beautiful decoration.
The product has the following main features: smooth surface, no blistering, no ribbing, moderate gloss, smooth surface and back surface, uniform thickness, uniform width, reasonable hardness, high elasticity, good quality, strong wear resistance, trimmed and sealed The color of the side and the side is close to the surface color, not whitish, good gloss, and the overall color of the finished furniture is coordinated.
Judge good or bad
1. Look at the hue and surface roughness of the edge banding strip. The color of the surface of a good edge banding strip is also very important. Whether the color is close to the customized product and is gorgeous. If the surface is very rough and there are pull marks, the quality is definitely not much better. This is the surface quality of the edge banding strip. It has nothing to do with the quality of the inner material of the edge banding, mainly the production process of the edge banding factory and the production technical skills of the employees. A good edge banding strip is: the surface must be smooth, no blistering or seldom bubbling, no drawing or few drawing, moderate gloss, not too shiny or too matte (unless there are special requirements).
2. Check the flatness of the surface and bottom of the edge banding and whether the thickness is uniform, otherwise it will cause the joint between the edge band and the board, the glue line is too eye-catching or the gap between the board and the edge band is too large, which will affect the overall beauty. Details determine success or failure, and often a small detail problem may bring an embarrassing situation where the overall effect is not good.
3. Whether the edge trimming is whitish, whether the surface of the bent edge strip is severely whitish, and whether the ground color of the trimming strip is close to the surface color of the board in question. PVC Edge Banding strips are mainly made of PVC and Calcium Carbonate plus additives. If the calcium carbonate content is too high, whitening of the edge banding and bending will occur, which proves that the quality of such products is not good.
4. Whether the strength is okay and whether there is elasticity. High strength means good wear resistance, and the corresponding quality is better. Too high strength also means increased processing difficulty. Low elasticity means low wear resistance and low aging resistance. In addition, according to actual production needs, manual trimming is generally required, and soft spots can be made appropriately, and the automatic edge banding machine can make hard points appropriately.
5. Whether the adhesive is applied evenly and whether it is easy to fall off during use.
6. Smell whether the PVC edge banding strips taste or not. Products produced with good quality raw materials generally have a small taste. If the taste is too large, it means that the quality of the raw materials used in production is relatively poor.
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