DEVICE FOR PNEUMO INTERTWINING OF FILAMENT YARN Russian patent published in 2017 - IPC D02G1/16 

FIELD: textile, paper.

SUBSTANCE: device for pneumo-intertwining of filament yarn is comprised of a housing with a hinged lid, lined with vibration damping and sound absorbing materials, sealants for the thread-guide channel, thread eyes for entering and exiting threads located on the end housing walls, a nozzle with a filling slot mounted on the housing, thread-eye channel and nozzles for supplying compressed air. Single piece sound absorbers are attached to the lid and the nozzle plate. According to the invention, the acoustical enclosure element is made in the form of a rigid and perforated walls, between which there are two layers: a sound reflection layer adjacent to the rigid wall and the sound-absorbent layer adjacent to the perforated wall, which consists of evenly distributed hollow tetrahedrons, allowing to reflect the sound waves falling in all directions. The perforated wall has the following parameters of perforation: hole diameter - 3÷7 mm, the percentage of perforations - 10%÷15%, and the form of the holes can be round, triangular, square, rectangular or diamond-shaped in profile. In the case of non-circular holes, the nominal diameter shall be the maximum diameter that fits into the polygon circumference, and mineral basalt-based wool shall serve as sound absorbing material, other materials that can be used are mineral wool or basalt wool, glass lined felt, foamed polymer, polyethylene or polypropylene. The surface of sound absorbers is covered with air-permeable porous paints, breathable coated fabric or nonwoven materials. The sound-absorbing material of the sound-absorbing element of the body is made of porous sound-absorbing material such as foamed aluminium or cermets or stone-shell rock with the degree of porosity which is in the range of optimal values: 30÷45% or metallic foam rubber or compressed material in the form of solid chips of vibration-damping material, for example elastomer, polyurethane, or plastic. The crumb size fraction lies in the optimal range of values: 0.3÷2.5 mm. Other materials that can be used are mineral piece porous materials such as pumice, vermiculite, kaolin, slag cement or another binder, or synthetic fibers. The reflecting material of the sound-absorbing elements of the body is made of aluminium alloys, subsequently filled with titanium hydride with the density of air within 0.5…0.9 kg/m³ with the following strength properties: compressive strength within 5…10 MPa, flexural strength in the range 10…20 MPa, such as foamed aluminium or sound insulating plates of glass staple fibrous material with the density of 60÷80 kg/m³.

EFFECT: increased efficiency of noise suppression and absorber resistance.

2 cl, 3 dwg