The low temperature port is generally divided into three kinds of materials.
Leather pulp Hong Kong treasure
The soaking water softening method is a material which is made from cowhide middle leather as a port treasure. It is also a softening method used to make leather shoes before. At present, Italy leather shoes have been trapped in traditional ideas, and the price is more expensive. This kind of port treasure which does not meet the economic benefits is relatively small.
Chemical film Hong Kong treasure
The soaking solvent (toluene) softening method is used, and the solvent can be softened, which is one of the revolutionary shoes in shoe making industry in recent years. The characteristics of soaking solvent can be very soft, the most conducive to the shoe molding, do not add or enhance any treatment, drying and cooling can reach the effect of stiffness, widely used for the shoe industry. The advantages of cheap, easy molding. Disadvantages: thick, forming a long time. The elasticity is the worst.
Hot melt adhesive
The heating and softening method is to use the heating (about 100 degrees to 120 degrees) to soften the hot melt adhesive which is placed in front of the shoes in advance, so as to facilitate the forming. The advantages are fast, thin and elastic, which is better than the commonly used low temperature port.
In addition, when making mountaineering shoes and safety shoes, there are also iron sheets and other special materials to be made as Hong Kong treasure.