Coating fabric coating method
Coating method for coated fabric
①Dry method. This method is a traditional process. The method is relatively simple. Just dilute the coating agent with solvent or water according to the required concentration, add necessary agents and colorants to form a coating slurry, and apply it evenly on the base fabric with an applicator. , and then dried and baked to evaporate the solvent or water, forming a tough film on the base fabric.
The process flow is: base fabric rolling → coating → drying → rolling (or copying) → cooling → finished product rolling.
②Wet method. Dissolve the coating agent (such as polyurethane) with dimethylformamide (DMF) to make a coating slurry. After coating, it is immersed in water to form a solidified film. Since DMF is infinitely miscible with water, DMF dissolves in water, while polyurethane is insoluble in water, and its concentration increases rapidly, and is finally deposited on the base fabric. During the solidification process of the coating, due to the role of the semipermeable membrane, DMF seeped out sharply from the polyurethane, causing channel micropores perpendicular to the film surface. Therefore, the surface of this polymer film is porous. If the diameter of these micropores is controlled within 0.5 to 5 μm, a rainproof cloth that is both breathable, waterproof, and moisture-permeable can be made. The process flow of wet coating is: base fabric rolling → coating → immersed in aqueous solution to solidify → drying → cooling → finished product rolling.
③Melt method. It uses thermoplastic resin as a coating agent to heat and apply it on the base fabric. When it is ready to be used, it is heated with a hot pressure roller or iron to melt the dot-like, linear or network-like resin originally coated on the base fabric again. , bonded to the processed fabric, often used for bonding collar linings. The process flow varies depending on the coating method, and the common ones are as follows.
a. Dusting method. The powdered resin is spread evenly on the base fabric using an electromagnetic vibration device, and then fixed using a non-contact oven (or infrared tube). This method commonly uses ethylene vinyl acetate coating agent, referred to as EVA interlining processing.
b. Powder dot method. Coating is carried out on a combination of two hot rollers and an engraving roller. There is a coating agent and a scraper on the upper part of this kind of engraving roller. The resin falls into the groove of the engraving roller. After the fabric is heated by the roller, the temperature of the cloth surface can reach 160~180℃, and the powder is completed at the moment of contact with the engraving roller. point transfer. The temperature of the hot roller is controlled at 160~240℃, the transfer temperature of nylon powder is around 55℃, and the polyethylene powder is around 95℃.
C. Pulse point method. Mainly used for non-woven fabrics, the basic process is the same as rotary screen printing.
④ Transfer film forming method. It is to first apply the coating slurry on the transfer paper or metal belt that has been pretreated with silicone, and then overlap the base cloth and the transfer paper face to face and transfer it to the base cloth through a rolling roller. After cooling, the transfer paper and the transfer paper are transferred to the base cloth. Separate the processed fabrics and serve. This method is mainly used for fabrics that are light and loose and sensitive to tension, such as leno, needle fabrics, non-woven fabrics, etc. The entire drying device of the machine is transported by mesh belts.
The process flow is: transfer paper coating → paper cloth lamination → rolling → cooling → transfer paper and coated fabric are separated and rolled up. 3WzTQri
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