The molecular chain of Pure Nylon Low Melting Yarn contains polar amide groups, which enables it to form hydrogen bonds or van der Waals forces with a variety of materials, thereby providing higher bonding peel strength. In contrast, the molecular chains of polyethylene (PE) and polyester (PET) are non-polar or weakly polar, and they mainly rely on physical melt adhesion when bonding, which can easily lead to delamination or weak bonding.
Nylon has moderate viscosity in the molten state and can evenly penetrate into the fabric gaps or fiber gaps at 85°C. After cooling, it forms an "anchoring effect", thereby enhancing the overall strength of the bonding layer. In contrast, the melt fluidity of polypropylene (PP) is poor, and it is easy to form surface bonding rather than deep penetration, resulting in low bonding strength, especially in multi-layer composite materials.
Because nylon itself has high toughness, its bonding layer is not easy to crack when subjected to dynamic stresses such as bending and stretching, which makes it particularly suitable for products that require frequent deformation, such as shoes and sportswear. In contrast, ethylene-vinyl acetate (EVA) has good elasticity but poor creep resistance, and may debond or fail after long-term use.
Nylon can still maintain high bonding strength in a humid environment, while polyester (PET) low-melting point fibers are prone to molecular chain breakage due to hydrolysis, thus affecting the long-term stability of the bonding layer. This feature makes nylon low-melting point yarn particularly suitable for products that may be exposed to humid environments for a long time, such as swimwear and outdoor equipment.
Nylon has a high glass transition temperature and can maintain stable performance in the range of room temperature to 85°C. In contrast, polyethylene (PE) may soften above 60°C, causing the bonding layer to deform or lose its support. In addition, low-melting point materials such as polycaprolactone (PCL) usually have a melting point of around 60°C and are easy to soften in high-temperature environments, limiting their use in high-temperature application scenarios.
Nylon itself has good UV resistance. If anti-UV additives are further added, its service life in outdoor environments can be significantly extended. In contrast, polyethylene (PE) and polypropylene (PP) are prone to embrittlement and powdering under long-term sunlight, resulting in a decrease in the performance of the bonding layer. This feature makes nylon low-melting point yarn more advantageous in outdoor textiles (such as tents, awnings, etc.).
The bonding strength of Pure Nylon Low Melting Yarn is significantly higher than that of PE and PP, and it is also more advantageous than PET, especially in applications that require high peel strength, such as footwear, automotive interiors, etc. Nylon is more stable than PET and PE in humid or high temperature environments, and is suitable for products that may come into contact with water or sweat, such as swimwear and outdoor sports equipment. Although PE and PP perform better in low temperature environments, nylon can still maintain good performance under conventional low temperature conditions without embrittlement problems.
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