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• Time of issue:2020-02-17
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(Summary description)First, the definition of leather:
The skin that is directly peeled from the animal without being processed is called raw skin, and the leather made through various processing techniques is called leather.



Second, the types of scratch:
Including cows, pigs, sheep, snakes, horses, kangaroos, crocodiles, and clear lizards, 95% of which are mainly cowhide, pigskin, and sheepskin.



Third, the anatomical structure of the dermis:


Four layers of leather

① Granular layer ② Reticulated layer ③ Tissue layer ④ Muscle layer

Composition of leather

water

protein

fat

Minerals

Other substances

content(%)

64

33

2

0.5

0.5





Fourth, the characteristics of various leather materials


Fetal cowhide: fine-grained beaded leather, soft and flexible, suede leather is particularly soft, males have growth marks, and women's high-level uppers.

Calfskin: The leather bead pattern is slightly rough, with obvious growth marks, extremely strong pulling force, good elasticity and good feel. It is mostly used for men's and women's high-end shoes.
    Children's cowhide: slightly rougher than calf leather, some leather fibers are slightly loose, and the elongation is very high. Men's B shoes
    Cowhide leather: rough leather with many flaws, cheap shoes for men.
    Lambskin: The leather surface is firm, strong enough, pores and beads are regular, beautiful women's high-end shoes or gift shoes.
    Goatskin: The larger the size of the leather surface, the less beaded it can be. It can be rubbed into a round beaded surface. Women's B shoes.

Snakeskin: The embroidery is very special and the leather is thin, but it is uncomfortable to wear women's A-level popular shoes.
    Horse skin: loose skin, rough leather, fine buttock skin, used for men's running shoes.
    Kangaroo leather: Durable and soft, similar to children's leather, men's and women's shoes.


With its unique naturalness, breathability, and flexibility, leather is used in furniture, shoes, clothing, and handbags for a wide range of lives. It cannot be replaced by any other chemical product. Dongguan Leather Goods Factory



Five, the identification of the dermis?
1. The leather texture of the dermis is natural and highly inconsistent (the texture of PU and PVC leather is consistent)

2. It feels fleshy (skin feel) astringent, but artificial leather feels smooth
    3. Genuine leather smells like an animal, and artificial leather is a chemical raw material.
    4. Burning the leather with fire has a burnt smell of fat burning, artificial leather has a green flame and liquefies after burning, and the smell is pungent
    5. Looking at the cut surface, the dermis has fibrous tissue, while artificial leather generally has small-pore foaming chemical materials on the cut surface.



Flaw of hides
(Mainly beef tendon, vascular veins, scratches, cuts, wind nails, squints, pinholes, loose surfaces, and cracked surfaces)



1
Damage caused by survival


A. Stab wound: stab wound of wire wind and tree stab or damage of gladiator?

B. Branding: Use hot iron and sulfuric acid for verification?
    C. Insect spots: Pests, cattle snakes, etc. scratch the surface of the cowhide and leave the damage of the slaughter.
    D. Knife injuries and damage to fibrous tissue during slaughter
    E. Blood vessels: insufficient bleeding during slaughter
    F 、 Scratching: laceration caused by excessively long peeling machine





2
Damage during storage


A. Salt spots: uneven staining due to phosphate formation

B. Corruption: The bead surface or fiber is in a state of corrosion and decomposition
    C, laceration: storage for too long makes the skin too dry and produces pearl surface burst



Seven, the type of finished leather


① Pearl surface: pearl surface, ground texture, palm skin

②Pearl skin: Preserving natural and superior shoe uppers, with different styles as cattle and cattle breeds and growing process can be embossed to change the shape
    ③ Grinding texture: Poor pearl surface, use sandpaper to rub the blemishes to improve the usage rate. It can be embossed or flat.
    ④Nuts: the fibrous layer after the skin is removed, the suede or the coating becomes the coating nut, that is, the wet or PU nut or the dry PU nut after being molded with PU


Eighth, leather inspection specifications


Leather grade: Inspection and grading according to the usage rate, combined with shoe type, customer acceptance, strength, leather, and size, usually divided into five grades

Class A: up to 85%

  Class B: 75% -85%
      C grade: 65% -75%
      Class D: 55% -65%
      E level: 55% or less

Generally, domestic leather materials are increased by 5 percentage points, that is, A grades are above 90% and E grades are below 60%.



Daqin Leather Goods Factory mainly produces and processes various types of genuine leather, imitation leather, and cloth. product. In the company of "good faith, with high quality, competitive price", for the purpose. Sincerely welcome customers at home and abroa