Precautions for the brush roller in the molding process of artificial leather_faq

Anhui Meixin Brush Factory introduces the precautions of the brush roller in the molding and processing of artificial leather ****: There are traces on the leather surface 1. There are foreign matter impurities in the paste or surface treatment agent. Should be cleared. 2. There are deep scratches on the surface of the steel strip. The new steel belt should be replaced. Second: Unclear leather pattern 1. The embossing roller is not placed horizontally. Should be adjusted to a horizontal position. 2. The temperature of the roller surface is uneven, and the temperature at both ends is low. The auxiliary heat source should be added at the low temperature to make the temperature distribution of the roller surface uniform. Third: There are cloth patterns on the leather surface after coiling and storage. 1. Insufficient cooling after embossing. Should strengthen cooling. 2. The storage environment temperature is too high. The finished product should be stored in a low temperature environment. Fourth: There are regular defects on the leather surface. 1. There are impurities on the surface of the pressure roller or the rubber roller of the embossing machine. Impurities on the roller surface should be cleaned up. 2. Defects on the surface of the roller. The surface of the roller should be ground to remove defects on the surface of the roller. Fifth: Large foam on the leather surface 1. The foaming temperature is too high. The foaming temperature of the plasticizing oven should be appropriately lowered. 2. The moisture content in the paste is too high. ? The moisture in the paste should be removed or replaced with a paste with a lower moisture content. 3. The bucky is wet. Should be dried. Sixth: Foam after foaming (i) Shaw loss 1. The nip of the embossing roller is too small. The pressure of the embossing roller should be appropriately reduced and the nip should be increased. 2. Too much traction. The traction force of the foam artificial leather should be appropriately reduced. Seventh: Foaming on the leather surface 1. The raw material is moist. Should be pre-dried. 2. The content of volatile matter in the formula is too high. Volatile additives should be avoided in foaming formulations. 3. Improper selection of additives. Fast gel plasticizers and slower triggers should be used. At the same time, a higher starting temperature should be used. Eighth: Uneven foaming on the leather surface 1. Too much air in the plastisol. The paste should be degassed. 2. Poor dispersion of foaming agent. The blowing agent should be ground together with the plasticizer. Ninth: The lateral thickness of the leather surface is uneven 1. The lateral thickness of the coating is uneven. The distance between the rollers of the coating machine should be adjusted appropriately to make the thickness of the coating uniform. 2. The temperature of the plasticizing and foaming oven is not uniform. The temperature of the oven should be adjusted appropriately to make the temperature evenly distributed. Tenth: The foam layer and the cloth base are not firmly bonded or peeled off1. The gel temperature is too high. The temperature of the preheating oven should be appropriately lowered. 2. The brush roller is too far away from the cloth base. The distance between the roller surface of the brush roller and the cloth base should be properly adjusted. The foam layer cannot be peeled off the steel belt when driving. The temperature of the steel belt is too high. Should be reduced appropriately. Eleventh: Deflection of the steel belt 1. The steel belt is unevenly heated and locally deformed. The steel belt should be run before the temperature rises while driving, and then stop after the steel belt cools down. 2. The tension rollers are not parallel, which makes the steel belt skew when running. The tension of the steel belt should be adjusted in time to make it run in the middle of the tension roller. Twelfth: Discoloration of the coating 1. Improper use of hair-inducing agents and stabilizers. Avoid using lead-containing initiators together with sulfur-containing tin stabilizers. For example, the use of lead-containing stimulators on the inner layer and the use of sulfur-containing tin stabilizers on the surface layer will cause discoloration of the coating film. Thirteenth: Bucky oil penetration 1. The temperature of the preheating oven is too low. The temperature of the preheating oven should be appropriately increased or the small exhaust vent should be closed. 2. The viscosity of the paste is too low. Should be increased appropriately. Welcome to www.mxbrushmachinery.com