SU682584A1 - Aerodynamic lap forming device - Google Patents

Description

one

The invention relates to the non-woven industry.

An aerodynamic canvas-forming device is known, which contains means for feeding a fiber-air mixture, a loosening unit having an impeller installed in a housing above the receiving conveyor, and a pipeline for air from the housing 1.

This device does not allow for the longitudinal and transverse calibration of the produced web, which reduces its quality.

The purpose of the invention is to increase the quality of the canvas.

This is achieved by the fact that the lower part of the body is made in the form of a cochlea with a perforated bottom wall, with the body having perforations in the upper part and a branch pipe with a throttle for exhausting air, in addition, the pipeline for extracting air from the body also has a throttle.

FIG. 1 schematically shows the aerodynamic canvas-forming device, the cross-section; in fig. 2 shows section A-A in FIG. one.

The aerodynamic canvas-forming device comprises means for feeding a fiber-air mixture with an inlet pipe 1, a loosening unit having a working

a wheel 2 with blades 3, on the outer surface of which the headset 4 is fixed. The impeller 2 is installed in housing 5, having a notch 6 and means 7 for changing the flow of the fiber-air mixture, the lower part of housing 5 is made in the form of a cochlea 8 with a perforated wall 9, and in the upper part of the housing 5 there is a perforation 10 and a pipe with a throttle 11 for exhausting air.

The device has a shaft 12, an electric motor 13, receivers 14 and 15, a choke W, a receiving conveyor P for withdrawing the formed canvas 18.

Aerodynamic canvas-forming device works as follows.

The air-fiber mixture from the carding enters through the common pipe into the inlet 1 and into the interscapular channels of the rotating impeller 2. The blades 3 of the wheel 2 wind the air-fiber mixture and feed it into the cochlea 8 with a perforated wall 9 through which air passes, and from fiber

a wedge-shaped canvas 18 is formed. Simultaneously with the formation of the canvas 18 on the perforated wall 9, a longitudinal orientation of the fibers in this canvas occurs due to the headset 4, which also

and calibrates the canvas layer and, in addition, helps move this layer towards the conveyor 17.

The orientation of the fibers occurs throughout the thickness of the canvas 18 produced as follows.

The fiber in the lower layer of the canvas is oriented in the initial part of the perforated wall 9 of the cochlea 8; as this layer moves in the direction of rotation of the impeller 2, a new layer grows in place of the moved layer. The process of orientation and weaving occurs continuously along the entire length of the cochlea 8 in the direction of rotation of the headset 4, since the formation of the canvas from the continuously incoming fiber occurs along the entire length, while the fibers and fiber complexes arrive at higher speeds and large complexes of them can penetrate sufficiently greater depth of the formed canvas, and to make this canvas with a greater density, which excludes the use of any needling masks for compaction.

If it is necessary to change the amount of friction during the movement of the formed wedge-shaped canvas 18 about the fixed perforated wall 9, a choke 16 is used, with which the normal pressure of the canvas 18 on the wall 9 is changed by creating an air pressure difference between the cavities of the impeller 2 and the cavity of the receiver 15.

Changing the flow rate of the air mixture fiber passing through the inlet 1, or keeping this flow constant when the normal pressure of the canvas 18 on the wall 9 changes, i.e. when the air flow through the perforated wall 9 changes, is carried out by releasing clean air into the atmosphere through the perforation 10. In this case, a change in the flow section in the throttle And leads to a change in the amount of the mixture passing through the pipe 1.

The precipitated fibers, as well as fiber complexes on the wall 9, are removed by the headset 4, while the latter is removed from the fibers by means of a recess 6, which allows the drug-sweeping forces to drop the fiber.

The execution of the lower part of the body in the form of a cochlea with a perforated lower wall and the presence of a perforation from the upper part and a branch pipe with a throttle for venting air, as well as throttles in the pipeline for suctioning air from the body helps to improve the quality, improve the smoothness and strength of the canvas.

Claims (3)

1. An aerodynamic canvas-forming device comprising means for feeding a fiber-air mixture, a loosening unit having an impeller mounted in a housing above a conventional conveyor, and a pipeline for sucking air from the housing, characterized in that, in order to improve the quality of the canvas, the lower part of the body is made in the form of a snail perforated bottom wall. 2. The device according to claim 1, characterized in that the casing has perforations in the upper part and a branch pipe with a throttle for air exhaust. 3. A device according to claim 1 and 2, characterized in that the pipeline for sucking air from the housing has a choke. Sources of information taken into account in the examination 1. US Patent No. 2940134, cl. 19-156, 1960. 15 jf Riga.1