SU472819A1 - Method of dedusting the paper web - Google Patents

Description

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The invention relates to a paper desalination technique on printing presses in the printing industry.

There is a known method of dedusting a paper web with a double-sided air blow and an electric field with subsequent suction of air with dust and sedimentation of the latter in a dust collector.

The effectiveness of this method is insufficient because the electrification of paper may be different both in size and in sign: Depending on the conditions for the manufacture and processing of paper.

Dust particles on the surface of the paper, which are cellulose fibers, filler grains, and motes - non-interlacing fibers, are attracted to the paper by electrical forces that are Coulomb or polarized; Two variants of the electric state of the dusty paper are possible: paper and dust are charged; Charged paper or dust. These electric forces are so great that they hold a large part of the dust on the paper, which provides for a dust-cleaning device. In addition, the pollution of the atmosphere with nitrogen oxides with an intense gas discharge and the additional power consumption make it difficult to CLEAN the paper.

The purpose of the invention is to increase the efficiency of dedusting the paper web.

According to the proposed method, an electric field is created directly in the area of a double-sided air blower of a moving paper web. At the same time, the electric field does not create a corona discharge current, which removes the charge from the paper web not due to its desalinization (in some ways,

on the contrary, additionally charging the canvas before dedusting), and directly influences the charged canvas to be dedusted in the area of its blowing by ponderomotive forces, and for this purpose, unlike all known dedusting methods, an alternating electric field is used yes on the moving canvas. The method is carried out by two-way air blowing of a moving paper note and creating a low frequency alternating electric field (for example, 50 or 100 Hz) in the blowing area, the intensity vector E of which is directed normal to the surface of the paper, and the amplitude value of the intensity Eg exceeds the intensity foYM's electric floor of dusty paper directly on its surface.

The process of dedusting paper is as follows. When a section of a moving dusty paper web enters the zone of the blowing and the electric field, then, starting from a certain moment, the vector of intensity E turns out to be opposite to the vector of intensity of the electric field of this area and increases to the amplitude value of It. At the same time, the electric forces of attracting dust particles to paper (regardless of whether they are Kulop or polarized) will begin to decrease. As soon as the value of E exceeds the value of Yabuy (or even earlier), the electric forces acting on the dust particles, as the calculation shows, change their direction opposite, 10Ж1К1с, i under 11l of best speed;

Caught up by the aerodynamic forces of the airflows that blow the paper, the dust particles move away from its surface.

Subject invention

The method of dedusting the paper web, for example in the printing process, by using a double-sided airblow and an electric field with subsequent suction of air with dust and deposition of the latter in a dust collector, characterized in dvigugsgos paper web.