EVA soles shrink in the process of foaming, how to solve it

It is a common phenomenon that EVA soles shrink during foaming. Here are some possible solutions:

1.Adjust the formula: Try changing the formula of the EVA sole to reduce the possibility of shrinkage. For example, you can try adding crosslinkers to improve the performance of the sole.

2.Lower foaming temperature: Lowering the foaming temperature appropriately can reduce foam shrinkage.

3.Use other materials: Try using other materials to make soles, such as rubber or TPU, which don't usually shrink during the foaming process.

4.Increase sole thickness: Increasing the thickness of the sole can reduce the effects of shrinkage while also providing better cushioning.

5.The above solutions may need to be modified and adjusted according to specific production conditions and requirements. If your EVA sole shrinkage problem is more serious, it is recommended to seek help from a professional organization or unit for a more accurate and effective solution.

EVA resin is a thermoplastic polymer material, which is a polymer with a linear molecular structure.

Softens and extends when heated in the sun: shrinks and hardens in severe cold weather, showing thermal expansion and cold contraction.

characteristics. It should not be used directly for solar cell encapsulation, as it will crush the cell and cause the solder wires to shift. Therefore, the EVA must be modified. The method is to add a crosslinker to the EVA, and when the EVA adhesive film is heated to a certain temperature, the crosslinker decomposes to produce free radicals.

Initiates the binding between EVA molecules, which forms a three-dimensional network structure, causing the EVA adhesive layer to cross-link and solidify, which can withstand changes in the atmosphere and no longer undergo thermal expansion and cold contraction. Therefore, the cross-linking index of EVA plays a crucial role in the quality and long life of solar cell modules. Its cross-linking degree of more than 60% is qualified.

Anti-shrinkage materials can be added, and mailbox communication can be added.

More and more daily necessities are marked with the word EVA, I don't know whether EVA is foam or rubber, sometimes I think it's foam, sometimes I think it's similar to rubber, especially the shoes we usually wear, most of the materials of the soles are marked with EVA materials, the shoes are light and elastic, so is the EVA sole foam bottom?

In the field of chemistry and mechanics, EVA refers to "ethylene-vinyl acetate copolymer" and the rubber and plastic foam materials made of it. It is a new type of environmentally friendly plastic foaming material, which has the advantages of good cushioning, seismic resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent. EVA products are designed to be processed and molded, and their shockproof performance is better than that of traditional foam materials such as foam, and meets the requirements of environmental protection, making them the best choice for export products.

Therefore, EVA sole is not strictly a foam bottom, but a new type of environmentally friendly plastic foaming material.

The sole made of EVA material has good softness and elasticity, even if it is below 0°, it can still have good flexibility, soft shock absorption; The PVC sole also has anti-aging, good ozone resistance, resistance, non-toxicity, biodegradability, and is an environmentally friendly material; The EVA sole is a closed cell structure, which does not absorb water, moisture resistance, and has good water resistance. The sole made of EVA also has its disadvantages, that is, the sole is not non-slip, because the EVA material is more slippery, and anti-slip measures are generally used when making the sole to increase the anti-slip performance.

EVA soles will shrink during the foaming process, how to control the length and curvature.

How to control the length and warp, EVA soles will shrink in the process of foaming, EVA soles will shrink in the process of foaming, and the formula cannot solve the clear size. Because in the foaming process, the decomposition of the blowing agent and the cross-linking of EVA must be carried out at a certain temperature, usually about 170-200, at such a high temperature, the volume of the gas is due to the thermal expansion and contraction of the potato hu, the volume will inevitably increase, after the foaming is completed, the foam will cool, and the foam volume will inevitably shrink. The only way to solve this problem is to change the process.

For example, by lowering the foaming temperature appropriately, foam shrinkage can be reduced. EVA foaming formula is generally composed of the following raw materials: main material, filler, foaming agent, bridging agent, foaming accelerator, lubricant.

The main ingredient is EVA or PE. Of course, in order to improve the physical properties of the product, some other materials can be added appropriately, such as rubber, POE (polyethylene octene co-elastomer), etc., and even a little TPR (a material with the properties of both rubber and thermoplastic) can be added to enhance some physical properties. As for EVA, the main indicator is the VA content, which is directly related to almost all the properties of EVA foam products.

Of course. Some can be foamed with only PE. The specific main material to use depends on the requirements of the product.

How about the sole of EVA and the bottom love is broken.

Hello, the only disadvantage of EVA soles is that the durability is very poor, because EVA belongs to foam soles, which will gradually wear out after long-term use, and the soles will become hard and flat, and if you go downhill, you may lose your anti-slip properties and wear resistance, relatively speaking, EVA soles have a short life, low durability, and are easy to lose performance. EVA is a new type of environmentally friendly plastic foaming material, which has the advantages of good cushioning, seismic resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent. EVA rubber and plastic products are designed to be processed and formed, and their shockproof performance is better than that of traditional hair and cherry bubble materials such as polyparsine styrene (foam), and meet environmental protection requirements, I hope it can help you.

Summary. The pro-EVA sole will not break after wearing it for a long time. EVA is a new type of environmentally friendly plastic foaming material, which has the advantages of good cushioning, seismic resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent.

EVA rubber and plastic products are designed to be processed and formed, and their shockproof performance is better than that of traditional foaming materials such as polystyrene (foam), and meets the requirements of environmental protection 1, with good softness and elasticity, and can still have good flexibility and soft shock absorption below 0. 2. The material has good anti-aging and ozone resistance, odor resistance, non-toxicity, biodegradable, and is an environmentally friendly material. 3. Good transparency, surface gloss, and good chemical stability.

How about the sole of EVA and the bottom love is broken.

Hello dear, glad to answer for you. Kiss, how about the sole of EVA, is the bottom love broken?

The pro-EVA sole will not break after wearing it for a long time. EVA is a new type of environmentally friendly plastic foaming material with a lack of sections, which has the advantages of good cushioning, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent. EVA rubber and plastic products are designed to be processed and formed, and their shockproof performance is better than that of traditional foaming materials such as polystyrene (foam), and meets the requirements of environmental protection 1, with good softness and elasticity, and can still have good flexibility and soft shock absorption below 0.

2. The material has good anti-aging and ozone resistance, odor resistance, non-toxicity, biodegradable, and is an environmentally friendly material. 3. Good transparency and surface gloss of surface imposition liquid, and good chemical stability.

EVA sole is foam. EVA sole has high resilience and tension resistance, high toughness, good shockproof and cushioning performance, excellent thermal insulation and low temperature performance, can withstand severe cold, closed bubble holes, and good sound insulation effect.

Closed cell structure, non-absorbent, moisture-proof, good water resistance, resistant to seawater, grease, acid, alkali and other chemicals, antibacterial, non-toxic, tasteless, non-polluting.

The material used in EVA sole is ethylene vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer), which is made by copolymerization of ethylene (E) and vinyl acetate (VA).

Abbreviated as EVA, the content is 5% 40%. Compared with polyethylene, EVA is widely used in foamed shoe materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields due to the introduction of vinyl acetate monomer in the molecular chain, which reduces high crystallinity, improves flexibility, impact resistance, filler compatibility and heat sealing performance.

EVA sole is foam.

The first consideration of the sole is comfort, and the foaming treatment can exponentially improve the shock and vibration damping performance of the sole.

If it is not foamed, because of its better resilience, the comfort of rubber is stronger than that of ordinary plastic, and the wear resistance is also stronger, but the creep resistance is weaker. Both plastics and rubber can be foamed, and because of the continuous development of plastic technology, the boundaries between rubber and plastic are not so clear.

EVA is good, rubber is not as wear-resistant as EVA. The specific characteristics of the two are as follows:

1. EVA features: EVA sole has high resilience and tensile resistance, high toughness, good impact resistance, excellent thermal insulation and low temperature performance, cold and low temperature performance, cold resistance, closed cell, good sound insulation effect, closed cell structure, no water absorption, moisture-proof, water resistance, seawater, grease, acid, alkali and other chemical corrosion, antibacterial, non-toxic, tasteless, non-polluting.

2. Rubber characteristics: The advantages of natural rubber are very soft, excellent elasticity, can adapt to various sports, and play a role in shock absorption, but the disadvantages are also very obvious, that is, it is not wear-resistant. Natural rubber is commonly used in indoor sneakers.

EVA shoe material belongs to a kind of EVA foam, the industry professional name is foam, of course, on the market, there are sponges or foams, referring to the same things.

Yes, something like a foam slipper, something somewhere between foam and a sponge.