There are several main varieties of fibrous thermal bonding method of the canvas: heated rollers in the gap engraved calendar; between the heated surface of the drum and the accompanying tape; hot air on net conveyors or perforated drums. In the first two cases are mostly flat, non-woven fabric, in the final – three-dimensional non-woven fabric. In the manufacture of three-dimensional nonwoven thermally bonded webs of As termoplatichnyh binders can be used as thermoplastic fibers and powders. Bond paintings engraved roller blades Bond hot air 3. Mechanical bonding.
Under mechanical way to obtain non-wovens to be understood the way in which there is a physical bond between the fibers together without using any adhesives or heat, but by weaving the fibers each other. The most common types of this method can be regarded as binding and hydro Needle ways to bond the fibers. Igloprobivanie. The process of obtaining needle-punched fabric with predetermined physical and mechanical properties by means of needle-punched machines. In the technology of nonwovens igloporbivnyh this process spreads to be a subsidiary or a principal. In the first case, canvas, past Punched the car is subjected to further physical and mechanical processing (laminated sealing, flooring, etc.). In the second case, the process is used as a way igloprobivaniya hardening, while receiving ready non-woven material with predetermined physical-mechanical and structural properties.
Process igloprobivaniya canvas based on a jagged (Hatch) needles that pass through the canvas, stretch (mix up) fibers in the transverse direction. Fig. 6. Scheme of the mechanical bonding of fibers – igloprobivanie hydro way binding. It is based on the interweaving of fiber material with water jets under high pressure. Usually tightly fastened to a perforated drum with water jets hitting the high pressure of farsunochnyh beams. These different processes are often compounds can also be combined. The ultimate finishing under the final finish Nonwovens is the process of giving the necessary properties of nonwovens: waterproof, airtight, non-inflammability, resistance to tearing, etc. In order to give the material certain properties have resorted to the following operations: 1. Impregnation by special trains. Usually this is done by dipping the material into a special bath with further drying of the material in special furnaces. 2. Laminating different materials. This treatment of the material allows the material to give enhanced barrier properties. C the current situation and outlook for the Russian market, as well as an analysis of equipment for the production of nonwoven geotextiles can be found in the report of the Academy of IKAR industrial markets "Market nonwoven geotextiles in Russia" and "Feasibility study of non-woven geotextile production organization."