Other

Igor A Sergeev

Alexandr A Ivanov

Alexandr Evgenievich Guschin

Ivan M Dianov

Vyacheslav S Alexandrov

Pavel M Luzin

Mikhail Vladimirovich Frolov

Sergei Arnoldovich Aizenberg

Elena I Zhukova

Evgeny I Mikhailov

Tatyana S Fofanova

Vera E Krylova

Rudolf V Zavodov

Lidia A Pankratova

Alexandr Fedorovich Kamenev

Semen A Leibenzon

Vladimir A Gorbushin

Sergei V Baburin

Sergei Vyacheslavovich Baburin

Evgeny Mikhailovich Golovko

Evgeny H Golovko

Alexandr Petrovich Muraviev

Vladimir Alexandrovich Gorbushin

Vasily Ivanovich Akimov

Valery N Nepein

Valery Nikolaevich Nepein

Alexandr P Muraviev

An apparatus for producing fibrous sheet material comprises a slot nozzle having side walls normal to converging frontal walls, its inlet opening communicating with means for dispersing fibers in a gas stream, while its outlet opening communicates with a chamber. A flat screen adapted to form a fibrous layer thereon is mounted under the chamber, and a suction box is arranged underneath the flat screen, wherein the side walls of the slot nozzle are parallel with respect to each other, and means for removing part of the gas from the gas-fiber stream are provided in the chamber under the outlet opening of the slot nozzle, the chamber being provided with branch pipes for gas exhaust, mounted substantially in the upper portion of the chamber.

Apparatus for production of fibrous sheet material

A method for producing fibrous sheet material comprising dispersing fibers in a gas stream to obtain a gas-fiber stream, supplying the gas-fiber stream onto a flat screen, removing gas from the gas-fiber stream through said screen to form a fibrous layer thereon, removing part of the gas from the gas-fiber stream prior to supplying it onto the flat screen, simultaneously damping transversal pulsations induced in the gas-fiber stream during the course of its movement. The fiber concentration is increased to 20-500 g/m.sup.3. The fiber concentration is chosen in accordance with the specific fiber and its properties. An apparatus for carrying out this method comprises a slot nozzle having side walls normal to converging frontal walls, its inlet opening communicating with means for dispersing fibers in a gas stream, while its outlet opening communicates with a chamber. A flat screen adapted to form a fibrous layer thereon is mounted under the chamber, and a suction box is arranged underneath the flat screen, wherein the side walls of the slot nozzle are parallel with respect to each other, and means for removing part of the gas from the gas-fiber stream are provided in the chamber under the outlet opening of the slot nozzle, the chamber being provided with branch pipes for gas exhaust, mounted substantially in the upper portion of the chamber.

Method for production of fibrous sheet material and apparatus for

A distinguishing feature of the method lies in that the moist fibrous raw material is constituted by a suspension of a fibrous material with a fibre concentration of 5-30 wt. %; said suspension is heated before dispersion to 102.degree.-145.degree. under a pressure of 1.1-4.0 atm abs and fed in the form of a stream into a moulding chamber where pressure in the stream is sharply reduced to 0.8-1.0 atm abs in the course of 10.sup.-1 -10.sup.-3 seconds.

Method of manufacturing fibrous sheet material

An apparatus for making sheets of fibrous material in a chamber having perforated top and side inner walls into which an air stream mixture with fibers therein is introduced through a nozzle over a travelling screen conveyor on which the fibers are settled to form a mat thereon. The chamber has solid outer walls defining a space over the chamber and on the sides thereof into which air under pressure is introduced to keep the fibers in the chamber from contacting the inner walls and becoming electrostatically charged. The apparatus is provided with mechanism for applying a vacuum through the air-permeable conveyor to settle the fibers thereon and for forming a sheet of fibrous material thereon.

Apparatus for aerodynamically forming a fibrous sheet material

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Saint-Petersburg, Russia

Igor A Sergeev