① dry method. This method is a traditional process, the method is relatively simple, as long as the coating agent diluted with solvent or water at the required concentration, and add the necessary chemicals and colorants dubbed the coating slurry, with a spread coater evenly coated on the fabric , And then dried, baked, the solvent or water evaporation, the substrate to form a tough film.
The process is: roll up the substrate → coating → drying → rolling pressure (or copy) → cooling → finished roll.
② wet method. Dissolve the coating agent (such as polyurethane) with dimethyl formamide (DMF) to form a coating slurry, and after coating, immerse it in water to form a coagulation film. Since DMF can be immiscible with water, DMF dissolves in water and polyurethane does not dissolve in water, the concentration rapidly increases and finally deposits on the base cloth. During the coating solidification, due to the effect of the semipermeable membrane, DMF drastically exuded from the polyurethane, resulting in channel micropores perpendicular to the membrane surface.
Therefore, the surface of such a polymer film is porous, and if the diameter of these micropores is controlled at
0.5 ~ 5μm, can be made both breathable and waterproof, moisture-permeable rain cloth. Wet coating process as follows: cloth roll → coating → immersion in aqueous solution solidification → drying → cooling → finished roll.
③ melting method. It is the thermoplastic resin as coating agent heating coating on the base cloth, stand-by, hot pressing roller or iron hot pressing, the original coated on the base cloth dot, linear or mesh resin melt again , Bonded to the fabric being processed, commonly used to bond the collar. The process varies depending on the coating method, there are several common.
a. Dusting method. The powder resin with electromagnetic vibrating device, the powder evenly spread on the fabric surface, and then without contact with the oven (or infrared tube) for fixation. This method commonly used ethylene vinyl acetate coating agent, referred to as EVA lining processing.
b. Powder point method. It is coated on two hot rollers and one engraving roller combination. The top of this engraving roll coating agent and scraper, the resin falls into the carved groove of the female groove, the roller heated fabric, the cloth surface temperature up to l60 ~ 180 ℃, the moment in contact with the engraved roller to complete the powder Into the point of transfer. Heat roller temperature control at 160 ~ 240 ℃, nylon powder transfer temperature of about 55 ℃, polyethylene powder at about 95 ℃.
c. Paste point method. Mainly used for non-woven fabrics, the basic process with the rotary screen printing.
④ transfer film method. It is the first coating slurry coated silicone transfer paper or metal pretreatment belt, and then the base cloth and transfer paper face to face superimposed by the transfer roll to the base cloth, after cooling, the transfer paper and Processing fabric separation Serve. The law is mainly used for thin and loose loose tissue and a more sensitive to the tension of a type of fabric, such as leno, knitwear, non-woven fabric, the whole operation of drying devices are used mesh belt transport.
The process is: transfer paper coating → paper laminated → rolling → cooling → transfer paper and coated fabric separation roll.