RU2437970C1 - Device for division of carbon braid - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: device consists of bath whereto there is supplied flow of liquid, of roll mills for supply of carbon braid into bath, and of rollers experiencing axial vibrations with ultra-sonic frequency from first vibrator. The device includes a unit of carbon braid with a channel of liquid flow containing surface active substance - SAS- and metal combs positioned downstream on a bottom of the channel. Also, the device is equipped with a unit for division of flattened combed carbon braid including a channel with a flow of liquid containing the SAS, and vertical metal plates arranged on the bottom of the channel. The unit for combing the carbon braid flattened in flow of liquid in the bath and the unit of division of the flattened and combed carbon braid are equipped with roll mills for supply of the carbon braid into the channel with liquid. At the bottom of the bath there is at least one additional orifice for supply of gas.

EFFECT: maintaining mechanical indices of carbon braids at simultaneous increase of accuracy of carbon braids division.

2 cl, 3 dwg

Description

The invention relates to a device for separating carbon tows and can be used in the process of separating carbon tows into thinner tows.

State of the art

A device for separating a fully untwisted bundle, consisting of a large number of fibers, for example textile, carbon, into several bundles, is described in GB 2340136. In this device, the bundle is pulled at a reduced speed and straightened by a transverse stream of air. Next, the expanded harness is pulled at normal speed and is divided into several harnesses by pulling through separate eyes.

The disadvantage of this device is the lack of conservation of mechanical properties of carbon tows.

A device for expanding harnesses is disclosed in US 6049956, in which a bundle of 1000-144000 carbon fibers is drawn through several successive expanders stretched parallel to each other between two disks. Each expander is an extensible tape or tube. The disk planes are located at some angle to each other. By changing the angle between the disks, you can adjust the process of separation of the harness.

The disadvantage of this device is the reduction in strength and modulus of elasticity of carbon fibers after expansion.

From US 3,704,485, a device is known for expanding a graphite fiber bundle into a graphite fiber strip, which allows the fiber bundles to be expanded into a large number of substantially separate graphite fibers. The straightening of the fibers is achieved by the action of vibration on the graphite tow in air with a frequency sufficient to separate the tow into fibers.

The disadvantage of this device is the lack of conservation of mechanical properties of carbon tows.

A carbon fabric expansion device is known having a freely rotating endless tape disclosed in US 5511395, in which a carbon fiber fabric is brought into contact with a lower surface of an endless freely rotating tape placed in water. The fabric is fed from a hot roll. The lower surface of an endless freely rotating tape with a fabric is irradiated in water with ultrasound from a radiator located at the bottom of the bath.

The disadvantage of this device is that it does not ensure the preservation of the appearance of carbon fibers.

From JP 01-282362, a carbon tow opening device is known in which a carbon fiber tow is stretched in series contact with several parallel rods. In this case, the rods vibrate in the axial direction with a frequency of 20 kHz.

The disadvantage of this device is the lack of conservation of mechanical properties of carbon tows.

It is also known a device for separating a bundle of carbon fibers moving in a stream of water when exposed to an additional counter flow of fluid, disclosed in DE 102004036414, in which a bundle of carbon fibers moves through a channel in a stream of water. In the opposite direction to the water flow and the movement of the tow, an additional air flow is supplied. The separation of the bundle into several fibers can be performed simultaneously or sequentially.

The disadvantage of this device is the reduction in strength and elastic modulus of carbon fibers after separation.

The closest device to the claimed technical solution is a device for expanding a tow in a fluid stream, described in WO 02/31242. The device comprises a preparatory ultrasonic device for expanding the tow and the main device for expanding the tow in a stream. In an ultrasonic device, the bundle zigzags stretches between several rollers that are placed in a liquid and experience axial vibrations with ultrasonic frequency.

The disadvantage of this device is the lack of accuracy in the separation of carbon bundles, expressed in that the spread in the number of filaments in carbon bundles obtained during the separation process exceeds 0.5% of a given number of filaments.

Disclosure of invention

The objective of the present invention is to provide a more technologically advanced device that provides effective separation of carbon tows while maintaining their appearance and preventing the increase in hairiness of the tows.

The technical result achieved by using the present invention is to maintain the mechanical properties of carbon tows while increasing the accuracy of separation of carbon tows by reducing the spread in the number of filaments in carbon tows after separation to 0.5% of a given number of filaments.

The claimed technical result is achieved by the fact that the device for separating carbon tows includes a cuvette, into which a fluid stream is supplied, having openings for supplying and discharging the supplied liquid, rollers for supplying a carbon tow to the cuvette, rollers located at the bottom of the cuvette and experiencing axial vibrations with ultrasonic frequency from the first vibrator, characterized in that the device further comprises a combing unit flattened in the fluid stream in the cuvette of the carbon bundle, including a channel with a fluid stream, containing surfactant flowing into the hole at the end of the channel, metal combs located on the bottom of the channel in the direction of fluid flow, experiencing vibrations in the direction of travel of the tow with ultrasonic frequency from the second vibrator and vibrations in the direction transverse to the movement of the tow with ultrasonic frequency from the third vibrator, a separation unit for a flattened combed carbon bundle comprising a channel with a fluid flow containing a surfactant flowing into the hole at the end of the channel, vertical metal plates, updated at the bottom of the channel, the cuvette, the combing unit of the flattened in the fluid flow in the cuvette cuvette and the separation unit of the flattened combed carbon bundle are arranged sequentially, the combing unit of the flattened in the fluid flow in the carbon tow cuvette and the separation unit of the flattened combed carbon bundle contain rollers for feeding carbon the bundle into the channel with liquid, and the cuvette contains at the bottom at least one additional hole for supplying gas. In the particular case of the invention, a variant is possible according to which the combs additionally experience vibrations from the fourth vibrator in the direction of movement of the tow with a frequency of 15000-40000 Hz, providing wave-like motion of the liquid.

The implementation of the invention

The process of separating the bundle consists of three stages: flattening, combing and separation, containing the appropriate device (more precisely, blocks).

At the first stage, a block is used to flatten the carbon tow, a diagram of which is shown in FIG. A liquid flow 1 (water, acetone, etc.) is supplied to the cuvette, which is bubbled by gas 2 (air, nitrogen, etc.) and contains surfactants. The fluid flow leaves the cell through the opening 3. Also, a carbon bundle 4 is supplied through the rollers 7 to the cell, which is drawn in a zigzag manner through the rollers 6, which are placed in the liquid and experience axial vibrations created by the vibrator with ultrasonic frequency (not shown). Carbon tow 4 emerges under the action of the Archimedean force of the bubbles of the bubbling gas. Under the influence of ultrasound and the flow of fluid sparged by the gas, the carbon tow is expanded and fed through the rollers in a flattened form 5 to the next separation stage.

A diagram of the combing unit of a flattened carbon tow is shown in FIG. A flattened carbon tow 5 is fed through rollers 8 into a channel with a fluid flow (water, acetone, etc.) containing surfactants, which flows through hole 9. As it enters the channel with a fluid flow, the flattened carbon tow undergoes longitudinal combing metal combs 10, which experience vibrations in the direction of movement of the bundle with ultrasonic frequency from the second vibrator (not shown) and vibrations in the direction transverse to the movement of the bundle with ultrasonic frequency from the third vibrator (n e shown). This block also contains dividing sections 12, made in the form of vertical metal plates, which perform in this block a preliminary function of separating a combed carbon tow. The main function of separating a combed carbon tow is carried out in the next block (see below in the description).

In the particular case of the invention, a variant is possible according to which the combs additionally experience vibrations from the fourth vibrator (not shown) in the direction of movement of the tow with a frequency of 15000-40000 Hz, providing wave-like motion of the liquid.

The next step is to separate the combed flattened carbon tow. For these purposes, the block shown in FIG. 3 is provided. A flattened combed carbon tow is fed through rollers 8 into a channel with a fluid flow 1 (water, acetone, etc.), which contains surfactants and flows through hole 11. By unitary movement of the unit from the feed rollers 8 with the aim of uniformly feeding the ends of the flattened combed carbon bundle into the separation section 12, which is a vertical metal plate, after which the separated carbon bundle 5 through the rollers is fed to the dryer, sacked and fed to the winding spools.

Claims (2)

1. A device for separating carbon tows, including a cuvette, into which a fluid stream is supplied, having openings for supplying and discharging the supplied liquid, rollers for supplying a carbon tow to the cuvette, rollers located at the bottom of the cuvette and experiencing axial vibrations with ultrasonic frequency from the first vibrator characterized in that the device further comprises a combing unit for flattened in a fluid stream in a carbon tow cell cuvette, comprising a channel with a liquid stream containing a surfactant draining into the hole at the end of the channel a, metal combs located at the bottom of the channel in the direction of fluid flow, experiencing vibrations in the direction of movement of the tow with an ultrasonic frequency from the second vibrator and vibrations in the direction transverse to the movement of the tow with ultrasonic frequency from the third vibrator, a separation unit for a flattened combed carbon tow, comprising a channel with a fluid flow containing a surfactant flowing into the hole at the end of the channel, vertical metal plates mounted on the bottom of the channel, and the cuvette, the calculation unit of a carbon tow flattened in a fluid flow in a cuvette and a flattened combed carbon bundle separation unit, and a flattened combed carbon bundle separation unit in a fluid flow cell and a flattened combed carbon bundle separation unit contain rollers for feeding a carbon bundle into the fluid channel, and the cell contains at the bottom at least one additional hole for supplying gas. 2. The device according to claim 1, characterized in that it further comprises a fourth vibrator providing vibrations of the combs in the direction of movement of the tow with a frequency of 15,000-40000 Hz to create a wave-like motion of the liquid.

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