Leather Cutting Process And Points For Attention

　　 Leather cutting process and points for attention

I. Leatherwear Kinds

1.PU thin skin, 2.PU skin, 3.VRGNR& skin, 3.VRGNR&.PU, soft skin, 5. soft texture, 6. fine fur leather, 7.FLOATER 8. fur, artificial skin, 9. skin, 10.PU skin, 11. anti fur.

Two. Characteristics and disadvantages of leather

Characteristics 1. porous tissue 2. has unique surface texture.

Disadvantages 1. irregular shape 2. defective 3. physical inconsistency

Three. Leather is rectangular in shape.

1. half open

2. whole skin.

Four. The essentials of leather use

1. first, understand the structure of shoe type: front, toe, carcass, leather, the whole shoe tongue extends to the left and right, other parts such as: Fu eye, outer hind hoof, shoe feather and so on, up and down, extending the carcass pad, so that the whole shoe upper can be widened and not allowed to grow longer.

2. know the area and the choice of the cutters.

3. the first knives are fixed knives, the most economical, and the distance between the knives and knives is 0.5 or zero. The use of defective surfaces, such as scars and branding, is usually tailored and overlapped. The imprint should be arranged from inside to outside.

4. edge pick up knife; larger side material can not pick up knife, should choose appropriate knife, big knife with knife.

The front row of the 5. parts should be arranged neatly, otherwise the edge of the first knife is very wasteful, and the waste of 6 to 12 layers of the material can be imagined.

Five. Cutting tools for main accessories. Tailoring Use

1. before cutting tools are used, such as pinholes and hole cutters, EVA is required before operation, EVA is higher than the cutter face, and 0.3 to 0.5MM is cut at once, so that the needle needles, the deformation of the punching and the pin holes of the leather materials can not be covered.

2. if you have a layering cutter, you must pay attention to whether the layering is too profitable. If it is too profitable, you must wear the strip to grind the arc to prevent the skin from being cut by pressing. If it can not be improved, you can use the scotch tape to seal the cover.

Six. Leather parts are painted with waterborne paint (containing resin) after exposure.

The proportion of using waterborne coatings is: coating: 701 resin: wax oil 5:5:4:1

Methods of operation:

1. the finished products must be tied firmly.

2. painting must pay attention to the amount of paint that the spray gun should not be too large. Be careful not to pollute the skin.

3. water-based coatings should not be arbitrarily added ingredients to avoid the lack of ingredients, resulting in lacquer now.

Seven. Grinding.

1. the use of sandpaper: the skin is 40 to 60 times thick, the soft skin is 80 to 100 times, and denser. If the soft leather is used for 40 to 60 times, it will cause the finished product to be worn and deformed. Using the 80 to 100 times, the PU surface will be worn away and the adhesion will be affected.

2. the amount of grinding: the main use of processing and adhesion, through the front grinding, through the lower surface of the shoe and the bottom of the market, if the width exceeds the surface of the bonding surface, will cause the skin to expose, B products, width below the bottom of the seam distance, rough processing will interrupt the line, resulting in the shoe and the background.

3. grinding degree: only wear out the PU layer.

Eight. Peeling.

1. reverse side peeling: the overlap and cover part of the vamp, avoiding the stitch of the stitch vamp and wearing uncomfortable, the width is set according to the board, the tail thickness is 0.8MM, if there are multiple overlaps, it overlaps the tail 0.5MM, according to the instruction manual operation, do not cut too thin, so as not to cause the finished product to split after the stress, if it is too thick, there will be convex marks.

2. hot melt glue peeling: the peeling machine is converted to hot melt glue machine, and the dripping tube is clean.

3. peeling: Note: there should not be a ladder with a thickness of 0.5MM.

Nine. Printing

1. printing: PVC printing ink + slow drying agent, respectively.

PU ink +22 solvent

Oily skin or waxing should be cleaned.

2. the printing mark line is the cover part, and the automobile decorative line can be water borne paint + advertising paint + a small quantity of 701 resin.

3. stereoscopic printing conditions: the finished product should be three-dimensional and must be oven. The temperature should not be too high. Too high will cause the surface to be too smooth and the ink flow is sparse. If the temperature is too low, the finished product will fall off.

4. (1) the key point of printing operation is that the printing part can not be waxed or rubbed, because paste contains chemicals, which can easily penetrate the cortex and cause the paint to fall off.

(2) the number of printing should be consistent, light or important, otherwise it will be chromatic aberration.

(3) for example, when printing leather, +11GN solvent can be used for half blending. There are two reasons for lacquer stripping: PU on the surface of the cortex and cracking on the surface of the skin.

Ten. High cycle task

1. first, adjust the depth of the high cycle, then adjust the parallel depth of the high frequency mode, and then step pressure.

2. when the new high cycle mode is used, when the font edge is crushed, the edge of the font should be worn out to avoid indentation.

3. jump pressure, first jump the wind pressure, and then jump voltage. When stepping voltage, we must press two at the same time.

4. high temperature and time should be adjusted appropriately. Generally speaking, the humidity is low and the time is longer.

5. the temperature and time of high cycle are adjusted according to the effect of different machines.