Talk about RB, PU, PVC, TPU, TPR, TR, EVA how to distinguish?
MD, EVA
MD: general name for MODEL or PHYLON; PHYLON: commonly known as Feilong, is a kind of material for making soles, general shoe sole, mixed material made of heated compressed EVA foam (EVA secondary high pressure molding products), characterized by light weight, good elasticity and seismic performance, hardness is controlled by foam temperature.
EVA: Ethylene Vinyl Acetate - Ethylene Acetate resin. Light and flexible chemical compound, outsole material, mostly sold in marriage with RB, the price depends on the material used. In addition to the combination of handicrafts, glue fees, almost 20 big hair. Composite materials also use it, called foam, the price can be ignored, but the factory accounting cost will certainly add.
so, there must be contain EVA, MD sole MD bottom also called PHYLON bottom. For example, MD=EVA+RB or EVA+RB+TPR and some shoes are RB+PU and so on.
RB, TPU
RB: Rubber. RB sole has good wear resistance, stable shrinkage and good bending, but the material is heavy and is generally used for outsole.
TPU: Mostly used in the sole, especially running shoes, can also be used in the upper accessories, the price is more expensive, TPU is divided into natural rubber and synthetic rubber, natural rubber mainly comes from the three-leaf rubber tree, synthetic rubber is by synthetic method, using different raw materials (monomer) synthetic different kinds of rubber, butadiene rubber and styrene butadiene rubber for the largest production of general synthetic rubber.
PU, PVC
PU: Polyurethane synthetic material, PU is leather material, many kinds of polyurethane, top material. On the sale of code, there are expensive and cheap, basically not expensive, there are also PU bottom, foreign trade list less use of this bottom. PU is based on foam rubber high density durable material, high density, high hardness, wear resistance, good elasticity, but strong water absorption, easy to break, easy to yellow. PU is often used in the middle sole of basketball and tennis shoes or the interlayer of the middle sole of the back palm, and can also be directly used in the outer sole of casual shoes.
PVC: Polyvinylchloride is a synthetic material that is widely used in the world today. PVC is also a leather material, and it is cheap, but there are high-grade ones as well. Most of them are cheaper, oil resistance, wear resistance, good insulation performance, but poor anti-slip performance, no cold resistance, no folding resistance, poor permeability.
TPU, TPR, TR
TPU: Thermoplastic Polyurethane elastomer, a linear polymer material. The advantage of TPU is good elasticity, but the material is heavy and the shock-absorbing ability is poor. It is often used for jogging, slow walking, and casual shoes.
TPR: Thermoplastic Rubber, thermoplastic elastomer, also known as thermoplastic rubber. TPR is different from RB, more fragrant, and the price is similar to RB, with a difference of 5 hairs. Both high strength and high resilience of rubber, but also injection molding, with environmental protection, non-toxic, a wide range of hardness, excellent coloring, soft touch, fatigue resistance, good temperature resistance, superior processing performance and other multiple characteristics. Both can be twice injection molding, can also be molded alone, but the wear resistance is poor.
TR: TPE and rubber synthetic material, with appearance pattern, feel good, bright color, high finish, high technical content characteristics, and can be 100% recycled, belongs to the environmental protection sole material.
Identification of PU, PVC, TPR, TR, RUBBER, etc. :
PU is the lightest and most wear-resistant, the sole of PU material is easy to recognize, it is very light in the hand, and the holes on the back of the sole are round. The sole of the PVC material is heavier in the hand than that of TPR. TPR material sole elasticity is better than PVC, the sole naturally falls down, if it can bounce up, it is TPR, PVC material sole is cheaper than TPR, but the quality is not good, especially in winter, it is easy to break the bottom. One feature of the soles of PVC material is that there is no injection hole, there is smell, and there will be white things when it is put for a long time. The surface of the TR sole is very bright, harder than the general TPR sole, the TR injection hole is more than the TPR, the injection hole is very special.
Weight: RUBBER (rubber) is the heaviest, PU, EVA the lightest; Material: PU expensive, EVA, TPR moderate, PVC the cheapest; Process: TPR is made of a molding, and PVC to process, ABS is generally the material of high heels, expensive and hard; Application: PVC is used in the material or non-bearing weight parts, or the manufacture of children's shoes; PU leather can be applied to the fabric of footwear or the part that bears weight. In terms of bags, PVC leather is more suitable. This is because the items in the bag are different from the feet in the shoes, and will not emit heat; They do not have to bear the weight of the individual.
The difference between PU and PVC is relatively easy, from the side to see the bottom cloth of PU is much thicker than PVC, there is also a difference in the feel, PU feels soft; PVC feel harder; You can also use fire to burn, the taste of PU is much lighter than the taste of PVC.