modern sports shoes is full of bubbles.
Foam is used to provide around the collar pad to buffer MATS, it can be used to line, even making the instep.
Today, the world of sports shoes is one of the main purpose of the bubble in the making.
The birth of a, rubber foam in 1929, is the earliest form of rubber foam was working for Du Luopu rubber company, chemists Eric Owen (
Just like making butter as ways to thrash latex sponge cake.
Soon after, the value of what we call the polymer foam plastic is reflected, innovation became popular.
EVA, EVA sole advantages to materials made of EVA sole.
Sole capacity and high resistance to tension, high toughness, good shockproof, buffer performance, heat insulation, heat preservation thermal resistance and low temperature performance can be cold and exposure, airtight bubble pore structure, non-absorbent, moisture-proof, good water resistance, oil resistance, acid, alkali and other chemical corrosion, antibacterial, non-toxic, tasteless, no pollution.
Three, foam rubber sole
categories when we looked at a pair of shoes, they are likely to contain two different kinds of foam
The open cell foam and closing hole.
The nature of each bubble can according to the basic composition and extensive changes, these components can be mixed in different proportion.
1, the hole foam is a spongy porous material, can make the air and water into its structure.
Open cell foam for vamp is very good, because they allow your feet breathe easier.
Called KF (
A polyurethane or PU)
Plastic foam is often used to make comfortable insoles
like the collar and the tongue.
Another kind of PU foam is usually used as lining material, very thin layers can be combined into shoes on the panel in order to reduce wrinkles.
2, closed-cell foam sneakers is the most common foam in called EVA or ethylene vinyl acetate closed-cell foam.
is very applicable to the bottom, high quality shoes will have about 40% and 60% of ethylene vinyl acetate, vinyl acetate, quantity is less, the bottom brittle and more likely to collapse.
Four plastic processing, EVA sole EVA sole plastic 'bubble' can be in several different ways, in which each bubble into raw material.
When the plastic is liquid foaming agent can be introduced as a solid.
When the combination is heated, foaming agent will swell and turn it into a gas, left in the whole plastic bubble.
This can be done in large hot press, in order to produce the material, although these is usually performed using injection molding machine, injection molding machine in the quick release before using hydraulic pressure head to EVA compression and heating, allowing the bubble inflated.
Another method using the mixture of EVA foaming agent particles and particles.
Combination of ingredients will be compressed in the mould, will be under pressure in their slow cooling.
made by compression molding technology.
The expansion of the EVA sole, foaming material will be loaded into the mold, and then put it in the hot press.
Bubble of the bubble will more inflation, which will lead to a lighter, more flexible in the bottom.
It is a bit like a second cooked bubble.
Nike use Phylon as the basis of all of its Lunarlon technology, and pioneered the use of this technology in the production of dual density soles.
it does not seem to be the most attractive materials, EVA sole foam to make it become the foundation of modern sports shoes.
Next time you put on a pair of comfortable shoes for our old partner EVA soles
and a wide range of bubble family leave a memory.
tag: EVA sole
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