Ⅰ. What are the signs of the inherent quality of PU leather?
Tensile strength is an important indicator of the inherent quality of leather. In order to comprehensively reflect the tensile strength performance of PU leather, leather manufacturers categorize tensile strength into the following types:
1. Tensile strength: This refers to the maximum load force that a unit cross-sectional area of leather can withstand. It is an important indicator of the surface leather strength. In other words, the magnitude of the tensile strength reflects the strength of the leather when pulled apart.
2. Bursting strength: This refers to the load force per unit area that the leather can bear when it is pushed up and cracked inside (or on the surface). This strength indicator mainly reflects the processability of the leather, and is not very important in actual use.
3. Tear strength: This refers to the maximum load force that PU leather can withstand before tearing when under continuous tearing force per unit thickness. It mainly shows the size of the external pulling force that the needle hole of the leather can withstand after sewing. Therefore, if the tear strength of the leather is too low, it is easy to tear from the needle hole or other open places.
4. Bending strength: This refers to the number of times the leather can be bent before its surface is damaged by repeated bending. This indicator has a great impact on the service life of some leather products (such as leather shoes). For example, the bending resistance of yellow cattle soft shoe leather is tens of times higher than that of yellow cattle decorative shoe leather, and the former has much higher bending strength, so it is not easily broken during use.
Regarding the hygiene performance of PU leather, in short, it refers to the water vapor permeability and air permeability of the leather. Because real leather contains a mesh-like small fiber bundle, it has considerable strength and air permeability.
Ⅱ. What are the characteristics of artificial PU leather compared to natural leather?
Natural leather is widely used in the production of daily necessities and industrial products because of its excellent natural properties. However, with the increasing world population, the demand for leather by humans has doubled, and the limited amount of natural leather can no longer meet this demand.
To solve this contradiction, scientists began to study and develop artificial leather and synthetic leather several decades ago to make up for the shortcomings of natural leather.
The more than 50 years of research history is the process of artificial leather and synthetic leather challenging natural leather. Scientists started with researching and analyzing the chemical composition and tissue structure of natural leather, then began with nitrocellulose-coated fabrics, and entered PVC artificial leather, which was the first generation of artificial leather. Based on this, scientists made various improvements and explorations, first in the improvement of the substrate, and then in the modification and improvement of the coating resin.
Artificial PU leather has a glossy, soft, natural appearance with a strong leather-like feel. It has excellent mechanical properties such as excellent adhesion to the substrate, wear resistance, scratch resistance, and anti-aging. It also has advantages such as good cold resistance, breathability, washability, easy processing, and low price. It is the most ideal substitute for natural leather.
Artificial PU leather has the advantages of high strength, abrasion resistance, cold resistance, air permeability, anti-aging, solvent resistance, soft texture, beautiful appearance, and good processing performance, etc.
English
