How does polyester hot melt provide bonding effect in shoe manufacturing

How does polyester hot melt provide bonding effect in shoe manufacturing

I. Introduction
In the field of shoe manufacturing, bonding technology is essential to ensure the quality and durability of shoes. As an advanced bonding material, polyester hot melt has attracted more and more attention due to its excellent performance and wide application prospects. This article will deeply explore the bonding principle, application advantages and specific application scenarios of polyester hot melt in shoe manufacturing.

II. Characteristics of polyester hot melt
1. Low melting point and high adhesion
The melting point of polyester hot melt is usually between 110℃ and 140℃, which enables it to melt at a relatively low temperature and quickly bond to other materials. Under high temperature, polyester hot melt will gradually soften and melt to form a sticky substance that can effectively bond the various parts of the shoe together. After cooling, the melted hot melt will solidify to form a stable bond, ensuring the firmness and durability of the bond.
2. Strength and wear resistance
Polyester hot melt has high tensile strength and wear resistance, and can withstand various external forces and frictions that the shoe is subjected to during wearing. This makes the shoe parts bonded with hot melt wire more durable and less likely to crack or fall off due to external forces.
3. Washability and stability
The shoe products bonded with polyester hot melt wire have good washability and are not prone to falling off or deformation of the bonded parts during washing. At the same time, polyester hot melt wire can maintain good stability under various temperatures and environments, and will not affect the bonding effect due to environmental changes.
4. Environmental protection
Polyester hot melt wire is an environmentally friendly material. The waste generated during its production process can be recycled and reused, reducing pollution to the environment. Compared with traditional chemical adhesives, polyester hot melt wire does not release harmful substances during use, which is safer and more environmentally friendly.

3. Bonding principle
Melt bonding process
During the shoe manufacturing process, polyester hot melt wire is woven or sewn between the materials to be bonded. When the temperature rises above the melting point of the hot melt wire, the hot melt wire will gradually melt to form a viscous fluid. This fluid can penetrate into the fiber gaps of the material and fit tightly to the surface of the material. As the temperature decreases, the melted hot melt wire solidifies rapidly, firmly bonding different materials together.
Formation of bonding strength
The bonding strength of polyester hot melt wire mainly comes from the physical and chemical effects between it and the bonded material. In the molten state, the hot melt wire can form physical effects such as hydrogen bonds or van der Waals forces with the active groups on the surface of the material, thereby enhancing the bonding effect. At the same time, the molecular chains of the hot melt wire will rearrange and crystallize during the cooling process, further improving the strength and stability of the bonding part.

IV. Application advantages in shoe material manufacturing
1. Improve production efficiency
Using polyester hot melt wire for bonding can simplify the process steps in the shoe material manufacturing process and reduce the time and labor required for traditional adhesive coating, drying and other links. The melting and curing process of the hot melt wire is rapid, which can achieve rapid bonding, improve production efficiency and reduce production costs.
2. Enhance product quality
The high adhesion and stability of polyester hot melt wire can ensure the firm bonding between the various parts of the shoe material, and effectively prevent the occurrence of problems such as debonding and delamination. This not only improves the overall quality of the shoes, but also extends the service life of the product and improves consumer satisfaction.
3. Adapt to bonding of complex shapes
Polyester hot melt wire has good fluidity in the molten state and can adapt to the bonding needs of various complex shapes and curved surfaces in shoe materials. For example, in the manufacture of 3D flying woven uppers, hot melt wire can fit the three-dimensional structure of the upper well, achieve seamless bonding, and improve the appearance quality and wearing comfort of the shoes.
4. Versatility
In addition to the basic bonding function, polyester hot melt wire can also provide additional functional properties for shoe materials. For example, it can increase the stiffness and strength of the fabric and improve the puncture resistance and wear resistance of the shoe material. In the manufacture of some high-end sports shoes and outdoor shoes, the application of polyester hot melt wire helps to improve the overall performance of the shoes and meet consumers’ demand for high-quality footwear products.

V. Specific application scenarios
1. Upper manufacturing
In the production of flying woven uppers, polyester hot melt wire is widely used for fabric reinforcement and bonding. By weaving hot melt wire into the upper material, the strength and stability of the upper can be improved without adding extra weight. At the same time, the melt bonding of hot melt wire can achieve seamless splicing of various parts of the upper, improving the beauty and comfort of the shoes.
2. Sole bonding
For the bonding of the sole and the upper, polyester hot melt wire provides a reliable solution. It can replace traditional glue, avoiding the environmental problems and weak bonding that glue may bring. In some direct injection molding processes of soles, hot melt wire can be pre-placed between the upper and the sole, and the hot melt wire is melted and bonded by high temperature during the injection molding process to form a strong connection.
3. Lining and interlayer
In the manufacturing of lining and interlayer of footwear, polyester hot melt wire can bond fabrics or functional materials of different materials together to form a composite material with warmth retention, breathability and other characteristics. This bonding method can not only ensure the close fit between the layers of materials, but also maintain the softness and comfort of the materials, and improve the wearing experience of the shoes.

VI. Conclusion
As an advanced bonding material, polyester hot melt wire has shown significant advantages and broad application prospects in shoe material manufacturing. Its low melting point, high adhesion, strength and wear resistance, and environmental friendliness enable it to meet the multiple demands for bonding effect, product quality, and production efficiency in the shoe material manufacturing process. With the continuous advancement of technology and further expansion of applications, polyester hot melt yarn is expected to play a more important role in the field of shoe material manufacturing and promote the innovation and development of footwear products.