DEVICE FOR PNEUMATIC ENTANGLEMENT OF FILAMENT YARNS Russian patent published in 2018 - IPC D02G1/16 

FIELD: chemical industry.

SUBSTANCE: invention relates to the production of chemical fibers and filaments, in particular to the molding equipment, texturing and textile processing for weaving filaments in a complex yarn. This is achieved by the fact that in the device for pneumatic entanglement of filament yarn, containing a hinged-lid body lined with vibration-damping and sound-absorbing materials, means for sealing the thread guide channel, slotted eyes for the entrance and exit of the thread, located on the end walls of the shell, installed in the body of the plate nozzle with a filling slot, threading channel and nozzles for supplying compressed air, with unit sound absorbers fixed on the lid and plate of the nozzle, the sound-absorbing element of the casing is made in the form of a rigid and perforated wall, between which two layers are arranged: sound-reflecting layer adjacent to the rigid wall, and a sound-absorbing layer, adjoining perforated wall, and consisting of uniformly distributed hollow tetrahedra, allowing to reflect sound waves incident in all directions, perforated wall has the following perforation parameters: diameter of holes - 3÷7 mm, perforation percentage 10 ÷ 15%, and the shape of the holes can be made in the form of holes round, triangular, square, rectangular or rhomboid shape, wherein in case of non-circular holes, maximum diameter of circle inscribed into polygon shall be considered as nominal diameter, and as a sound-absorbing material, a mineral wool on a basalt basis is used, or mineral wool, or basalt wool, or glass wool with glass-felt lining, or foamed polymer, polyethylene or polypropylene, while the surface of fibrous absorbers is treated with porous paints that let air in, or coated with air-permeable fabrics or nonwoven materials, while the sound-absorbing material of the sound-absorbing element of the housing is a porous sound-absorbing material, for example, foam aluminum or cermet or rock-shell with a degree of porosity, in the range of optimum values of 30÷45%, or a metal pore, or a material in the form of compacted crumb of hard vibrating damping materials, for example an elastomer, a polyurethane, or a plasticate, the size of the crumb fractions lying in the optimum range of values of 0.3-2.5 mm, and also porous mineral piece materials, for example pumice, vermiculite, kaolin, slag with cement or other astringent, or synthetic fibers, while a material based on aluminum-containing alloys is used as the sound-reflecting material of the sound-absorbing element of the casing, followed by filling with titanium hydride or air with a density within 0.5…0.9 kg / m³ with the following strength properties: compressive strength within 5…10 MPa, bending strength within 10…20 MPa, for example, foam aluminum, or soundproofing plates based on a glass staple fiber type “Shumostop" with a density of material, equal to 60÷80 kg / m³.

EFFECT: technical result is an increase in the efficiency of sound attenuation and the stability of the sound absorber.

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