Insole composites generally involve composites between materials such as mesh, leather, etc., and EVA foam materials or TPU foam materials. After compounding, the requirements for adhesion strength are relatively high. Before the hot melt adhesive film process became popular, glue composites were commonly used. Not only were they not environmentally friendly, but there was also a dripping problem, which affected the environment in the workshop and the health of workers. With the development and production of substrate-free hot melt adhesive films in the hot melt adhesive film industry, the cost of the hot melt adhesive film process has been reduced, making it possible for hot melt adhesive films to replace traditional glue composite insoles. The hot melt adhesive film process is simple, easy to use, and there are almost no changes to the equipment. The advantage is that it is environmentally friendly and harmless, clean production is achieved, and from the perspective of comprehensive costs, costs can be reduced.
EVA hot-melt adhesive film or TPU hot-melt adhesive film is often used to compound insoles. The details depend on the material of the bonded insole. Generally, EVA foaming materials use EVA hot melt adhesive film, and TPU foaming materials use TPU hot melt adhesive film for bonding. According to the specific requirements for bonding, substrate-free hot melt adhesive film products with a thickness of less than 5 wires are generally selected.
