| 摘要 |
In a process for discontinuous lamination of technical textiles, i.e. textiles for other purposes than the manufacture of garments, and similar materials, wherein a first layer of material is coated with an adhesive in a spraying station (3) and joined with a second layer of material, the adhesive is a moist-curing solvent-free polyurethane prepolymer which is sprayed by means of nozzles on the first layer of material under essentially anhydrous conditions, and then the laminate is allowed to cure in usual atmosphere with normal moisture. The adhesive preferably contains maximum 1.5 % free isocyanate, and it preferably has a viscosity of about 1000-9000 mPa.s at 130 DEG C, a density of about 1.1 and a softening point (ring/ball) of 45 DEG C. Such an adhesive is sprayed at a temperature of about 180 - 190 DEG C, measured at the tip of the nozzles (4). This provides products with extremely advantageous properties, which may e.g. be used for the production of building elements, fire resistant coverings, sound deadening plates and mats, conveyor belts, cleaning sponges, hospital articles, car parts and survival suits for drilling platforms. In the production the drawbacks and health risks usually associated with spray lamination are avoided. |
