METHOD OF PRODUCING NEEDLE-PUNCHED SILICA THERMAL BARRIER MATERIALS AND TECHNOLOGICAL LINE FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC D04H11/00 

FIELD: textiles, paper.

SUBSTANCE: in the method for manufacturing needle-punched silica thermal barrier materials comprising preparing a fibrous mixture, forming fibrous web with aerodynamic method and formation of needle-punched web as feedstock, the silica fibers with the diameter of 5-7 microns and 8-20 microns are used or their mixture in a ratio of (10-90):(90-10)% which are divided in fibers on serrated drum, forming a fibrous web is carried on a conveyor of web-forming machine due to combining aerodynamic and mechanical methods. Then, the resulting fibrous web is subjected to the action of the needle board of the needle-punching machine equipped with percussion needles with serrations in both forward and reverse directions, forming the needle-punched web of thickness 3.0-10.0 mm is carried out per one process cycle, and forming of needle-punched web of thickness 12.0-30.0 mm - in two stages. First the webs-blanks are made with preliminary percussion in two directions per one pass of the web through the needle-punching machine. Then the webs-blanks are folded to the desired thickness followed by final punching in two directions per one pass through the needle-punching machine, the formed nonwoven needle-punched web enters the device of cutting and winding, and the silica fibers have a porous structure with pore size of 3-10 A (angstroms) and the production line for production of needle-punched silica thermal barrier materials, comprising a device of mixing fibrous mass, a feeding conveyor, a web-forming unit, a needle-punching machine which has a table with a needle board and with needles fixed on it. At that the percussion needles fixed to the needle board, are made with serrations in the forward and reverse directions. Moreover, the number of rows of needles with serrations in the forward direction located at the inlet to the needle board, is 2-3 times greater than the number of rows of needles in reverse direction of serrations disposed in the final part of the needle board and the two-sided percussion of web (from up to down and from the bottom up) is carried out per one technological progress of the needle in one needle-punching machine, percussion needle size and serrations is proportional to the diameter of the silica fiber.

EFFECT: use in the production of silica fibers.

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