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Tuesday, 11 February 2014 03:57

A light material for shoes outsoles-TPR

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  • Sole as an important part of the shoes, how can the outsole reduce the cost of the premise while maintaining the testing requirements of the international market and consumer demand is one of the important competitive. At present, the sole type of material that can be purchased in the market range of different pattern, rubber, thermoplastic rubber, polyurethane or thermoplastic polyurethane, and the traditional thermoplastic rubber TPR typical formula of thermoplastic elastomer TPE58-65% poly-alpha methyl styrene resin ATL3-5% nano-calcium CCR20-25% polystyrene PS12-16%, thermoplastic styrene-butadiene rubber SBS2-5%, 5-10% of a softening oil, anti-violet agent UV (Model 301 ) 1-3% anti-oxidant ANTIOXIDANTS (Model TM-3) 1-3% titanium dioxide TITANIUMDIOXIDE (Model K930) 1-5% the ultralight foam powder (Model A-9) 3-5 ‰ , low temperature expansion agent 3-5 ‰, the white foaming 3-5 ‰, which the thermoplastic elastomer TPE, their production processes to the corresponding formula of raw materials into the mixer mixing TPR particles, and then pour the TPR particles into the barrel of raw materials, according to the requirements of the color graded pellets of different colors after heating, graded injection installed mold machine table out of the last cooling finished, this traditional recipes TPR outsole due mainly formula is chemical raw materials TPE proportion of weight, twists and turns and poor resilience, the the traditional TPR proportion of approximately 0.8-1.1 twists and turns of about 50 000 times without damage, resilience is about 50-70 degrees does not collapse, NBS resistance grinding of approximately 20-42%.
  •              While traditional EVA typical recipe of ethylene (E) and vinyl acetate (VA) EVA70 80% of nano-calcium CCR10-15%, 5-8% filler, ZnO1-zinc oxide 5%, and so on, the main ingredients EVA, the quantity used in their production processes to try out the mold tryout recorded data recorded in accordance with the tryout, EVA raw material particles pounds weight placed fixed dissolved, a fixed weight of pellets poured into the mold off after heating 6-7 minutes (temperature of 180-185 degrees), and then remove mold the bottom of the finished product, due to the early-shaped outsole surrounding smooth on the corresponding number, so the early-shaped outsole surrounding Roughing mold, smooth pressed into the mold and cover push the heating station about 10 minutes of heating temperature of 170-180 degrees, mold into a cooling station mold cooling after about 5 minutes pull out the finished bottom and flash trimming . On traditional recipes EVA outsole is characterized by light weight, but its main ingredients for the EVA so poor wear resistance of about 15-20%, and the production process is more complex capacity is not high, the cost is correspondingly high.
Tuesday, 11 February 2014 03:56

TPR sole invention

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  • An outsole (1) for a shoe has a backing member (4) of thermoplastic rubber and on an area of the exterior surface of that backing member an intermediate layer (12) of thermoplastic polyurethane and an outermost layer of fabric (10), the area comprising at least 51 percent of the contact surface of the outsole. In producing the outsole, a sheet of fabric is overlain with a sheet of thermoplastic urethane, the sheet is heated to about the melting point of the TPU to permit the TPU to adhere to the fabric, and the fabric is cooled. The TPU-covered fabric is cut to the size and shape required to fit a backing member, and position in a mold on a bottom surface of a mold, and a quantity of TPR is injected at a temperature lower than the melting point of the TPU but high enough to render the TPU tacky, to insure the inherence of the TPU-covered fabric to the backing, including the resultant outsole.
Tuesday, 11 February 2014 03:55

Outsole invention background

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  • OUTSOLE Background of the Invention
  • This invention relates to inserts in the tread surfaces of outsoles.
  • It is well known in the art to provide inserts
  • 5 in the wear surfaces of outsoles to thereby impart to the outsole various desirable characteristics, e.g., water proofing, cushioning, flexibility, increased friction, etc. It is desirable to enhance the adherence of such inserts to the remainder of the outsole and to
  • 10 reduce the steps necessary in the manufacturing of such outsoles.
  • Summary of the Invention In general, the invention features an outsole comprising a first sole component of oldable material, 15 and at least one other sole component around which is molded the first sole component, the other sole component forming at least a portion of the wear surface of the outsole.
  • In its method aspect, the invention features . 20 cutting an insert component, applying an adhesive to the one surface of the insert component, rigidly securing the insert component within a mold with the one surface facing upward, closing the mold, and injecting moldable material, at elevated temperature into the mold, thereby ■• 25 allowing the moldable material to flow around and, in cooling, adhere to, the insert component.
  • In preferred embodiments the moldable material is thermoplastic rubber; the insert component is open cell crepe rubber; the surface of the insert component 30 opposite the one surface is deskidded prior to insertion of the insert component in the mold; the insert component is uniformly approximately between 1/4 and 3/16 of an inch thick; and the durometer value of the insert component is greater than that of the moldable 35material.
Tuesday, 11 February 2014 03:53

How to tell PVC PU PE out sole of shoes

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PVC EVA PU PE soles identifying

  •      PVC is the most common summer wear slippers, but winter is hard PVC, plasticizers such a long time inside the overflow, it will crack. The quality of his maximum density. PVC is the cheapest.
        
        EVA density, a thermoplastic elastomer, ethylene (E) and vinyl acetate (VA) formed. Summer and winter, like soft, lightweight. Vinyl acetate (VA content) content is higher, its transparency, flexibility and toughness will be relatively increased.
       
        PU foam or leatherette general production, usually do soles.
       
        PE surface is smooth, but the hard, such things of PE.
       
        EVA is a biodegradable, environmentally friendly products is by blowing the heat generated in the process of nitrogen, ammonia and a small amount of carbon dioxide, the crosslinked produce micro pores. Say that environmental protection is a production process or adding a foaming agent what some of what additives better.
Tuesday, 11 February 2014 03:53

How to tell PVC PU PE out sole of shoes

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PVC EVA PU PE soles identifying

  •      PVC is the most common summer wear slippers, but winter is hard PVC, plasticizers such a long time inside the overflow, it will crack. The quality of his maximum density. PVC is the cheapest.
        
        EVA density, a thermoplastic elastomer, ethylene (E) and vinyl acetate (VA) formed. Summer and winter, like soft, lightweight. Vinyl acetate (VA content) content is higher, its transparency, flexibility and toughness will be relatively increased.
       
        PU foam or leatherette general production, usually do soles.
       
        PE surface is smooth, but the hard, such things of PE.
       
        EVA is a biodegradable, environmentally friendly products is by blowing the heat generated in the process of nitrogen, ammonia and a small amount of carbon dioxide, the crosslinked produce micro pores. Say that environmental protection is a production process or adding a foaming agent what some of what additives better.
Tuesday, 11 February 2014 03:52

What is BPU outsole -a new type of outsole material

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What is BPU outsole

  •         BPU is a new type of modified polyurethane (PU), with environmental protection, low density (weight ultralight), surface junction thick skin (smooth surface), good toughness, not easy to break, weather resistance and good. Alternative EVA outsole, EVA waterproof, inflatable PVC bottom station, Clogs, PVC foam base station and so on.
    This modified polyurethane imitation wood material is very light, has a beautiful grain, temperature, and the degradation of adjustable features, is the new green materials.
Tuesday, 11 February 2014 03:51

The way of manufacturering EVA outsole

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The way of manufacturering EVA outsole

  •        A process for manufacturing an ethylene vinyl acetate (EVA) sole that involves weighing molding compounds for manufacturing the sole. The molding compounds include, by weight, 65-75% of ethylene vinyl acetate pellets, 3-5% of blowing agents, 20-30% of fillers, and 1-2% of crosslinking agents. The molded compounds are mixed, and extruded by means of a twin screw extruder so as to form a web of unfoamed extruded output. The web is cut into sheets.
  •         At least one of the sheets is placed into a first mold unit, which is heated and pressurized so as to form a rough foamed sole.

  •         The rough foamed sole is placed into a second mold unit, which is heated, pressurized, and cooled so as to form an embossed sole with a predetermined pattern. The embossed sole is trimmed so as to form a finished ethylene vinyl acetate sole.

 

Tuesday, 11 February 2014 03:42

EVA chemical techs

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  • EVA technology

     
    Ethylene vinyl acetate known as EVA or sometimes simply as “acetate”) is the copolymer of ethylene and vinyl acetate. The weight percent vinyl acetate usually varies from 10 to 40% with the remainder being ethylene.

    It is a polymer that approaches elastomeric materials in softness and flexibility, yet can be processed like other thermoplastics. The material has good clarity and gloss, barrier properties, low-temperature toughness, stress-crack resistance, hot-melt adhesive water proof properties and resistance to UV radiation. EVA has little or no odor and is competitive with rubber and vinyl products in many electrical applications.

    Chemical Structure
       
    EVA is also used in biomedical engineering applications as a drug delivery device. The polymer is dissolved in an organic solvent (e.g., methylene chloride). Powdered drug and filler (typically an inert sugar) are added to the liquid solution and rapidly mixed to obtain a homogeneous mixture. The drug-filler-polymer mixture is then cast into a mold at -80 degrees and freeze dried until solid. These devices are used in drug delivery research to slowly release a compound over time. While the polymer is not biodegradable within the body, it is quite inert and causes little or no reaction following implantation.

    Hot glue sticks are usually made from EVA, usually with additives like wax and resin. EVA is also used as a clinginess-enhancing additive in plastic wraps.

    YOU SHOULD KNOW MORE ABOUT EVA

Tuesday, 11 February 2014 03:41

Foam shoes soles material

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  •         EVA resin shoe is our most important applications. EVA resin used in the shoe, the vinyl acetate content is generally 15% to 22%. Since EVA Resin blends with soft foam products, good elasticity, resistance to chemical corrosion and other properties, it is widely used in high-end shoes, hiking shoes, slippers, sandals, shoes and interior materials. In addition, this material is also used for insulation panels, gymnastics mats and sealing material fields. China's Guangdong Shunde, Zhongshan, Fujian Jinjiang, Quanzhou and Zhejiang Wenzhou is the main production base of China's footwear annually consume large amounts of EVA resin products.
  •          EVA is the traditional hot pressing, made out of something that is better than the injection, but the process is complicated, human and material resources is quite large. Production base.
  •          EVA injection molding machine is used the EVA particles directly into the mold inside the machine, vacuum vulcanizing about 400 seconds after the mold is opened, in-mold foam molding soles, and then through heat, cold sizing box shape. Most important feature of this method is that high yield, a molding. drawback is easily deformed, a long time yellow, shrink. is currently the most advanced production technology EVA bottom A group of 10 stations machine asking price is about 150-200 thousand.
  •          EVA would be far more upscale than the PVC Pure EVA slippers very expensive. Now more than 10,000 one ton of raw materials EVA, EVA processing generally two ways, the traditional with foam machine, out of the product is EVA sheet, and then need to be cut An alternative is to use injection molding machines, injection molds like PVC as stereotypes of course also be used for secondary foaming EVA foam, mainly used to make sports shoes in the end. device can also do other sports cushioning member. You can also do other products, such as surfboards, taekwondo training with the board, the more common materials used for thermal insulation, such as air conditioning pipe package, etc. to do traditional EVA foam beach slippers, and now the market shrink badly.
  •          EVA Rubber Products is a new environmentally friendly plastic packaging materials, has a good buffer, seismic, heat, moisture, corrosion science laboratory, etc., with a non-toxic, non-absorbent. EVA molded rubber products processed by the design, the shock better than polystyrene (foam) and other traditional packaging materials, and meet environmental requirements, is the best choice for export products. Relative to the shock packaging can be cutting, forming; due to density differences, can also have a wider range of uses.

Foam shoes soles material

Tuesday, 11 February 2014 03:40

Different out soles compared

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  • About PU, PVC, TPR, RUBBER such recognition

  •         PU is the lightest and most durable. Course, price is the most expensive.
  •         PU sole material is easy to recognize, very light in his hand, soles are round the back of the hole.
  •         PVC material TPR soles in his hand than to be heavier.
  •         TPR soles elastic material is better than PVC, the soles of the holding firm, natural falling down, if they can bounce back, then that is the TPR
  •         TPR soles PVC material to be relatively cheap, but the quality is not good, especially in the winter, it is easy off the bottom.
     
            The sole PVC material has a characteristic that is not an injection hole, as well as with the smell, then taste. Stood for a long time it is also president of the white stuff.
            
            TR sole surface is very bright. Than the average TPR soles to be stiffer. TR injection holes more than the TPR. Injection hole is very special.
  • Weight: RUBBER (rubber) heaviest, PU, ​​EVA lightest
    Material: PU expensive, EVA, TPR moderate, PVC cheapest
    Craft: TPR is made ​​out of a molded, and to be processed PVC, ABS material is generally high heels, expensive and hard,
  • Applications: PVC lining is used in non-weight-bearing parts, or manufacturing children's shoes; PU leather for shoes can withstand the weight of the fabric or the site. In the bag, the more is applied PVC leather. This is because the article is different from the bag to wear the foot in the shoe, do not emit heat; do not bear the individual's body weight.
    PU, PVC difference method is relatively easy to see from the corner of the base fabric PU much thicker than PVC, also feel a difference, PU feel softer; PVC hard some of the texture; also use fire to burn, PU's to taste the taste than PVC much lighter.

 

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