EVA and TPU Hotmelt for Footwear Shoemaking
This is one of the most commonly used hot melt adhesives for shoes. EVA hot melt adhesive is a solvent-free solid adhesive made by melting and mixing ethylene-vinyl acetate copolymer (EVA) as the main component, adding plasticizers, tackifying resins, antioxidants, flame retardants and fillers. It has the advantages of non-toxicity, no environmental pollution, and easy preparation. It is widely used in furniture, shoemaking, electronics and other industries.
Description
EVA and TPU Hotmelt for footwear shoemaking
EVA hot melt adhesive
This is one of the most commonly used hot melt adhesives for shoes. EVA hot melt adhesive is a solvent-free solid adhesive made by melting and mixing ethylene-vinyl acetate copolymer (EVA) as the main component, adding plasticizers, tackifying resins, antioxidants, flame retardants and fillers. It has the advantages of non-toxicity, no environmental pollution, and easy preparation. It is widely used in furniture, shoemaking, electronics and other industries.
EVA hot melt adhesive has strong cohesion and low molten surface tension. It has hot glue relay for almost all substances and has excellent chemical resistance, thermal stability, weather resistance and electrical properties. Commonly used in shoe vamp and back counter
TPU hot melt adhesive film for shoe material
Why is TPU hot melt adhesive film needed for shoe material bonding?
Traditional shoemaking technology relies on solvent-based glue, which has pain points such as VOCs pollution, uneven bonding strength, and poor aging resistance. TPU hot melt adhesive film has become the "invisible hero" of high-end shoe materials such as sports shoes, outdoor shoes, and safety shoes due to its characteristics of no chemical solvents, rapid hot pressing molding, high elasticity and bending resistance. It is especially suitable for complex material combinations such as flyknit uppers, EVA midsoles, and rubber outsoles.
Five core advantages of TPU hot melt adhesive film
1. Super strong hydrolysis resistance to cope with extreme environments
TPU materials still maintain more than 90% bonding strength in humid environments, completely solving the problem of shoe material debonding.
Case: After a certain outdoor brand of mountaineering shoes uses TPU adhesive film, the salt spray test life is extended by 3 times
2. High elasticity matches dynamic bending
Hardness is adjustable, elongation>500%, and it can withstand 100,000 bends without delamination (ASTM D430 standard).
Application scenario: Dynamic fit between running shoe upper and midsole
3. Precise temperature control to protect sensitive materials
Melting point range **110℃-140℃**, lower than the deformation temperature of EVA foam material (usually >150℃), avoiding heat and pressure damage.
4. Environmental compliance, meeting export standards
Passed REACH and FDA food contact certification, adapted to EU footwear environmental directive (2023/XX/EU).
5. Revolution in process efficiency
Hot pressing time only takes 5-15 seconds, which is 80% faster than the traditional glue curing process and reduces energy consumption costs.
Key application scenarios of TPU film in shoe material bonding
Shoe type/part Solution Performance index
Sports shoe flying woven upper 0.2mm transparent TPU film seamless bonding Air permeability>3000g/m²/24h
Safety shoe steel toe cover 1.5mm flame retardant TPU film (UL94 V-0) Peel strength>8N/mm
Snow boots waterproof stitching Low temperature resistant -40℃ TPU film Ice surface adhesion retention rate>85%
Sandals EVA medium and low composite Yellowing resistant UV grade TPU film ΔE<2 after 300h UV aging
Shoe factory selection guide: 4 steps to match the best TPU film
1. Substrate adaptability test
- Flying woven fabric/PU leather: choose low melting point (110-120℃) transparent TPU
- Rubber/TPU outsole: use high hardness oil resistant type
2. Thickness and weight selection
- Thin upper: 0.1-0.3mm (weight 30-60g/㎡)
- Heavy work shoes: 0.5-1.0mm (weight 80-150g/㎡)
3. Functional requirements
- Outdoor shoes: hydrolysis resistance/UV grade is required
- Children's shoes: mandatory food contact grade certification
4. Process verification
- Hot press parameters: temperature error ±3℃, pressure 0.3-0.8MPa
- It is recommended to conduct a 48h wet heat aging (85℃/85%RH) simulation test first
Industry breakthrough case: TPU film helps a certain brand of running shoes reduce weight by 20%
In order to improve the performance of racing running shoes, an international sports brand uses 0.15mm ultra-thin breathable TPU film to replace the traditional sewing + glue process:
- Weight optimization: single shoe weight reduction of 38g, marathon runners' performance improved by 1.2%
- Production efficiency: the laminating process was reduced from 3 to 1, and the daily production capacity increased by 25,000 pairs
- Market feedback: product premium of 15%, return rate dropped from 5.3% to 0.7%
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