KOCHETOV DEVICE FOR ENTANGLING OF FILAMENT YARN Russian patent published in 2017 - IPC D02G1/16 

FIELD: textile, paper.

SUBSTANCE: device for entangling of filament yarn is comprised of a housing with a hinged lid, clad with vibration cushioning materials and sound absorbing materials, a sealant for a thread-guide channel, slot-hole eyes for thread entering and exiting located on the end housing walls, a nozzle with a filling slot mounted on a plate in the housing, thread-guide channel and nozzles for supplying compressed air. Single sound absorbers are fixed on the lid and the plate of the nozzle, sound absorbing elements of a mineral wool on a basalt basis, or a mineral wool, or a basalt wool, or a fiber glass with a glass wool, or a foamed polymer, for example polyethylene or polypropylene are used as a sound absorbing material of the housing and the lid, as well as fixed on the plate nozzles on both sides of the single sound absorbers. The sound absorbing element is clad on its entire surface with an acoustically transparent material, for example as a glass cloth or a polymer, or it is made of a soft foamed porous noise absorbing material, for example as a foamed polyurethane foam or a polyethylene foam, or of a rigid porous sound absorbing material, for example as a foam aluminium, or based on aluminium-containing alloys with their subsequent filling with titanium hydride or air with a density within 0.5…0.9 kg/m³ with the following strength properties: compression strength within 5…10 MPa, bending strength within 10…20 MPa, the sound absorbing material on the inner surfaces of the housing and the lid, as well as on single sound absorbers is made in the form of chips of hard vibration cushioning materials, for example, elastomer, polyurethane or plastic, placed in a sheath of a sound transparent material. The size of chip fractions lies in the optimal range of values of 0.3…2.5 mm, characterized in that the sound absorbing housing element comprises a smooth and perforated surface between which there is a sound-reflecting layer adjacent to the rigid wall and a sound-absorbing layer adjacent to the perforated wall. The layer of the sound-reflecting material is made in the form of a section, comprised of evenly distributed hollow tetrahedrons allowing to reflect sound waves falling in all directions, and the perforated wall has the following perforation parameters: the hole diameter - 3÷7 mm, the perforation percentage - 10÷15%. As per shape, the holes can be made as holes of circular, triangular, square, rectangular, or rhomboidal section. In case of non-circular holes, the maximum diameter of a circle inscribed in a polygon should be considered as the nominal diameter, basalt-based mineral wool or basalt wool, or fiber glass with a glass wool, or foamed polymer such as polyethylene or polypropylene are used as a sound-absorbing material. The surface of the fibrous absorbers is treated with porous air-permeable paints or covered with air-permeable fabrics or non-woven materials, or as a sound absorbing material of the sound absorbing housing element a porous sound absorbing material is used, for example, a foam aluminium, or metallic ceramics, or a shell stone with a porosity degree in the range of optimum values 30÷45%, or metalloporolon, or a material in the form of compacted chips of hard vibration cushioning materials. The size of chip fraction lies in the optimal range of values: 0.3…2.5 mm, also porous mineral single materials can be used such as pumice, vermiculite, kaolin, slags with cement or another binder, or synthetic fibers. The surface of the fibrous absorbers is treated with porous air-permeable paints or covered with air-permeable fabrics or non-woven materials, and as a sound-reflecting material of the sound absorbing housing element is used a material based on aluminium-containing alloys with their subsequent filling with titanium hydride or air with a density within 0.5…0.9 kg/m³ with the following strength properties: compression strength within 5…10 MPa, bending strength within 10…20 MPa, for example, foam aluminium, or sound-insulating board based on glass staple fiber with a material density of 60÷80 kg/m³. The perforated wall of the sound absorbing housing element is made of structural materials with a layer of soft vibration cushioning material applied on their surface on one or two sides. The ratio between the thicknesses of the material and the vibration cushioning coating lies in the optimum range of values 1/(2.5…3.5), or of stainless steel, or galvanized sheet of 0.7 mm thickness with a polymeric protective-decorative coating of 50 microns thick, or aluminium sheet with a thickness of 1.0 mm and a coating thickness of 25 microns, or of hard decorative vibration cushioning materials. Between the sound absorbing layer and the layer of sound-reflecting material of a complex section adjacent to it, there is an element of resonant type, made in the form of a rigid resonance plate with resonant holes that perform the functions of the neck of Helmholtz resonators. The volume functions of the Helmholtz resonator are performed by a layer of sound reflecting material of a complex section, consisting of uniformly distributed hollow tetrahedrons allowing to reflect sound waves falling in all directions.

EFFECT: increased efficiency of noise suppression and absorber resistance.

4 dwg