Leather health performance, simply put, is that the leather air permeability and water vapor permeability. Since the dermis contains small fibers mesh, so Jieju considerable strength and breathability.
(1) Permeability: Permeability is defined as the number under a certain pressure and a certain time, the unit area of the leather through the air. All kinds of leather breathability varied. Textile and finishing and impact performance and the thickness of its layer breathable leather itself loose fibrous tissue is decisive. Generally speaking, after finishing the leather has not been poor ventilation than leather finishing, and the thicker the coating layer permeability worse; nubuck full grain leather is better than (the surface of the leather retain the leather) permeability.
(2) water vapor permeability: The water vapor permeability of leather, also known as absorbent Paishi means enables the leather side of the water vapor from the air humidity into the temperature by small leather side of the air to the performance . Leather water vapor permeability performance is good or bad depends on its good or bad, but also by the impact of the leather itself moisture absorption capacity. Because leather has good water vapor permeability, sweat steam when people wear leather products can be smoothly discharged into the air, so that people feel worn leather than leather of many to be comfortable.
Fastness is an important indicator of the intrinsic quality of the leather. In order to fully reflect the fastness properties of leather, leather fastness divided into the following categories:
Leather fastness
(1) Tensile strength: it refers to the leather cross-section unit can withstand the maximum power load pull off. This indicator is one of the important indicators of surface leather fastness. In other words, the tensile strength is reflected in the size leather pull off solid strength.
(2) Tear strength: refers to the thickness of the leather units can withstand the maximum load force continues to tear. After it mainly leather stitched, pinhole can withstand external pull size. So, if the leather tear strength is too low, it is easy to tear from a pinhole at the mouth or other places.
(3) crack strength: refers to leaving the leather to be jacked up inside (surface) showed cracks on the unit area of the load on the force. The indicator reflects the strength of leather workability, and in the actual wear is not very important.
(4) The flexural strength: refers to leather after repeated bending and it often damaged when curved surface phenomena appear. The level of this indicator, there is a great influence on some leather products (such as shoes) wearing of life. Such as the degree of resistance to bending than cattle cattle upper leather soft leather uppers high modified several times, the former than the latter high flexural strength and is not easily broken off in the course of its use.