RU2234472C2 - Method and apparatus for manufacture of cord connection from glass fibers - Google Patents

Abstract

FIELD: production of cord connections from glass fibers.

SUBSTANCE: method involves stretching glass fibers arranged in parallel with one another by means of rotating stretching surface; removing said fibers after predetermined time interval from stretching surface; after removal of glass fibers from rotating surface, connecting said fibers in direction transverse to direction of rotation of rotary stretching surface and stretching in direction parallel to radial direction with respect to stretching surface; forming air pad by means of which glass fibers are amortized upon turning thereof. Rotation is provided with radius and at an angle at which at least predetermined part of glass fibers are not broken. Method further involves subjecting connected glass fibers to joining process and applying preparation composition. Glass fibers are joined by controlled air flow. All glass fibers are moved in each case only in one plane except when glass fibers are moved during joining process. Apparatus has rotating stretching surface, glass fiber removal device and guiding device adjoining to glass fiber removal device and oriented forward. Guiding device has at least partly funnel-shaped construction and turning portion has deflecting cavity. Guiding device has turning portion arranged behind glass fiber removal device and having rotation angle below 120 deg. Finishing device is positioned behind guiding device in direction of movement. Glass fibers are made from C-glass.

EFFECT: increased efficiency and strength of yarn.

11 cl, 2 dwg

Description

The invention relates to a method for manufacturing a glass fiber bundle connection, in which glass threads located next to each other are pulled by a rotating exhaust surface, which are removed from the exhaust surface after a predetermined residence time and rotated, and after removal, the glass fibers are connected across the direction of rotation of the exhaust surface and extend in a direction parallel to the radial direction of the exhaust surface. The invention also relates to a device for the manufacture of a glass fiber tow connection comprising a rotating exhaust surface on which a stripping device is located, adjacent to which a forward-oriented guide device is adjacent.

A method and apparatus of this type are known from US 2,621,444, where glass filaments are pulled with an exhaust drum and removed with a scraper blade, and air may be blown between the scraper blade and the exhaust drum to improve the removal process. In front of the scraper blade there is a clamp containing an adjustable wall defining the gap formed between it and the exhaust drum, through which the glass fibers must pass before they are removed by the scraper blade. A rotary device is located behind the scraper blade, behind which there is a funnel in which the glass fibers are connected across the direction of rotation of the exhaust drum. When turning, the glass threads are guided along the wall of the rotary device.

Other method and device are known from DE 3634904 A1, where glass fibers after removal are introduced into a spinning funnel, the axis of which is located mainly parallel to the axis of rotation of the drum forming the exhaust surface. At the end end of the spinning funnel, the fiber joint can then be pulled and wound. The residence time is determined by the angle of the drum and the speed of rotation.

Although there are practically endless glass threads on the exhaust drum, it can be observed that the fiber joint thus made is a staple fiber joint. Staple fibers have a limited length of several centimeters. True, they adhere well to each other due to twisting in a spinning funnel, however, strength, i.e. the tensile force or the maximum tensile force of the connection of fibers of this kind is limited. This makes it difficult to use this type of fiber compound for warp yarns. To make such staple fiber yarn suitable for warp yarns, relatively expensive finishing operations are often required.

The basis of the invention is the task of making it possible to manufacture yarn, especially suitable for warp threads, with greater strength than yarn from staple fibers.

For the method of the type mentioned above, this problem is solved by the formation of an air cushion by which the glass fibers are depreciated upon deflection.

Thus, the so-called "straight yarn" is made. Many glass fibers lying parallel to the drum are removed from it, as before. However, a subsequent spinning operation is excluded, in which most fiber damage occurs. On the contrary, the glass filaments are joined along a direction parallel to the axis of the exhaust drum. Then the bundle of threads is pulled from the exhaust drum no longer parallel to its axis, but in a direction perpendicular to it. In other words, if the glass filaments from the traditionally used bushings come down to the exhaust drum and are removed in front, then the resulting fiber mix is pulled further forward. In this way, a bundle of fibers with a structure similar to an elementary fiber is achieved. If in fact there are not only endless glass fibers, then in this case a significantly higher fiber bonding strength is achieved than when using staple fibers according to DE 3634904 A1. In addition, a very dense material is obtained. The quality of this straight yarn reaches the quality of the roving. However, in the manufacture of rovings, as a rule, a water-containing dressing is applied, the water component of which as a result, when the spools are ready, must dry. Thus, the spool of a coiled roving always contains a certain amount of water. In the invention, this disadvantage is eliminated. The method can be carried out "dry". When turning, the glass threads should not rest against the wall. On the contrary, they soar on a controlled air cushion.

The rotation is preferably carried out with a radius and an angle at which at least a certain part of the glass fibers does not break. This part can be determined statistically. Thus, the strength of the yarn is further enhanced. If you ensure that at least 50% or at least 70% of the glass strands can withstand rotation without damage, yarn with relatively long individual fibers is obtained.

The joined glass strands are preferably subjected to a closure process. This closure may consist, for example, in twisting, for which a stream of air is used. This further enhances the strength of the yarn. The closure process binds the fibers into “straight yarn” so that the spools are no longer pulled apart in parallel, but connected.

After joining the glass strands, the preparation is preferably applied. The formulation may also be applied before or during the closure process. Thanks to the preparation, the antifriction properties of the yarn or its ability to rewind can be improved.

The connection is preferably carried out using controlled air flow. Due to this, individual glass filaments practically “non-contact” pass through parts of the device, which further reduces the risk of damage. To direct the air flow, of course, any guide walls or channels are necessary. Separate glass fibers can float in the air stream.

The glass filaments preferably move in each case in only one plane, except for movement upon joining. Due to this, the direction changes insignificantly and, accordingly, the risk of damage, for example, a break in the thread, is also small. In addition, the direction of the thread is simplified. The less you need to change direction, the higher the pulling speed can be.

The problem is also solved by the fact that in the device of the type described above, the guide device, at least partially, has a funnel-shaped structure, and the rotary section has a deflecting cavity.

Thanks to this design, it is possible to connect into a bundle the threads located on the exhaust drum next to each other and parallel to each other without twisting them. The connected glass strands can then be pulled directly forward. Since it is necessary to rotate the threads, it can be carried out in one plane, not counting the movement when connecting. When turning, the glass threads should not rest against the wall. They, on the contrary, hover on a controlled air cushion. If there is a cavity for deflection on the pivot section, then a correspondingly large air cushion can be formed in it, so that the threads will be even more depreciated during rotation. In this case, fluctuations in the supply speed may be less.

The guide device preferably has a pivot section located behind the pickup device and having a rotation angle of less than 120 °. The angle of rotation determines the change in direction. Due to a slight change in direction, the risk of breaking glass fibers during rotation is relatively small. Therefore, a very stable fiberglass yarn with high strength can be made.

It is advisable that the turning radius is greater than the bending radius at which a predetermined portion of the glass fibers breaks. The smaller the radius with which the glass threads rotate, the greater the danger of their fracture. With a "careful" turn, which is due to a larger turning radius, the risk of breaking the threads is less.

It is advisable that the finishing device is located behind the guide device in the direction of movement. The finishing device can be made, for example, in the form of a closing, twisting or texturing device. A simple air nozzle can be used. The yarn thus treated can be more or less suitable for use directly as warp yarns.

Glass filaments are preferably formed from C-glass. Using the described construction, yarn can be obtained comparable to yarn formed from E-glass, but from much cheaper raw materials.

The invention is described in more detail below on the example of a preferred embodiment with reference to the drawings, in which:

figure 1 depicts in perspective a device for the manufacture of yarn from glass threads;

figure 2 is a schematic side view.

A device 1 for manufacturing the so-called straight yarn 2 comprises a bushing 3, i.e. small melting baths for glass, for example, in the form of pellets, which have on their lower side a large number of dies of a known kind, from which glass filaments flow 4. Glass filaments 4 are fed in a known manner to the rear side of the spinning drum 5, which may also be called an exhaust drum . When the spinning drum 5 rotates in the direction of the arrow 7, its outer surface 6 forms a rotating exhaust surface. The glass filaments 4 adhere to the outer surface 6 and can therefore be extended. After turning through a predetermined angle, the glass filaments are separated by a stripping device 8, for example a scraper blade, i.e. removed from the outer surface 6 of the spinning drum 5.

The scraper blade essentially does not act mechanically directly on the glass filaments, which, as can be seen from FIG. 1, lie on the outer surface 6 of the spinning drum 5 next to each other and parallel to each other, and separate the air layer adjacent to the drum and thereby also lying on the drum glass threads 4.

Then the removed glass filaments enter the guiding device 9. In the guiding device 9, they first fall on the rotary section 10, where their direction of movement changes by an angle of slightly more than 90 °. If you imagine that the glass filaments 4 as they pass around the spinning drum 5 lie essentially in the same plane (the plane of the cross section perpendicular to the axis of rotation), then their rotation on the rotary section 10 is also carried out mainly in this plane. Thus, the glass fibers are not drawn parallel to the axis of rotation, as is the case with DE 3634904 A1.

True, a small lateral movement of the glass filaments 4 is inevitable, since it is necessary to connect them parallel to the axis of rotation of the spinning drum 5. For this, the guide device 9 has a funnel-shaped section 12, the side walls 13, 14 of which converge forward.

Air separated from the outer surface of the spinning drum 5 by the scraper blade of the stripping device 8 enters the guide device 9, where it rotates forward in the rotary section 10 and is compressed on the funnel-shaped section 12 in the direction from the axial ends of the spinning drum 5. In this case, air flow accelerates . Thus, this air duct provides two effects. Firstly, it serves to connect a plurality of glass threads 4 lying parallel to each other and at the same time load them with a certain tensile stress. This is especially advantageous when starting up the device 1. The resulting bundle 18 of connected threads can be fed to the winding device 15 for winding with the required tension.

On the pivot section 10, an air cushion can also be provided in the deflecting cavity 16, where backpressure is formed, as a result of which the glass filaments do not press against the upper wall of the guide device 9 while the device is operating, but can be pulled out at the lower end of the guide device, often even at a short distance outside of him.

Finishing device 17 is provided behind the guide device. It can be a closing, twisting or texturing device or just an air nozzle. By matching the peripheral speed of the drum to the drawing speed of the winding device 15, the volume of yarn can be changed. For example, if both speeds are equal, then a more compact yarn is obtained than if the peripheral speed of the drum is greater than the speed of drawing.

However, in any case, thanks to the guiding device, yarns are obtained that consist of yarns, which, although they do not form fibers that are infinitely mathematical, but have a relatively large length that exceeds the length of staple fibers by several times. This is also due to the fact that the rotation in the portion 10 of the guide device is carried out relatively carefully. The rotation is performed at a relatively small angle and with a radius at which the risk of breaking the threads is small.

Behind the finishing device 17, a device for applying the formulation may also be provided. The device 19 may also be located in front of or inside the finishing device 17, if an air nozzle is used as the finishing device 17. It depends, among other things, on the type of preparation.

As glass, a relatively cheap so-called C-glass can be used. Despite this, yarn 2 is obtained, the strength of which is quite comparable with the corresponding E-glass yarn.

Thus, using the device and method, the glass fibers in the guide device are not twisted, but only connected into a fiber bundle with a structure similar to an elementary fiber. The resulting yarn behaves like yarn from endless glass fibers. It turns out a very dense material. In contrast to the method of manufacturing rovings, drying is excluded. Yarn made in this way can be used as warp threads in fabrics or knitwear. For yarn made from staple fibers to be suitable as warp yarns, it must be twisted, i.e. additional operation required.

Yarn 2 has a strength in the range limited by the strength of the yarn of staple fibers and the strength of the yarn of elementary fibers. You can achieve a further increase in the strength of the yarn, for example, in the finishing device 17. In appearance, the yarn 2 is similar to a roving or textured yarn. The manufacturing speed is relatively high and can reach 1600 m / min. Needless to say, alkaline glass can also be used within the scope of the invention.

Claims (11)

1. A method of manufacturing a glass fiber bundle connection, in which glass filaments located parallel to each other are pulled by means of a rotating exhaust surface, which are removed from the exhaust surface after a predetermined residence time and rotated, wherein the glass filaments after removal are connected across the direction of rotation of the exhaust surface and stretch in a direction parallel to the radial, relative to the exhaust surface, direction, characterized in that they form an air hearth a piece with which the glass fibers are absorbed during rotation. 2. The method according to claim 1, characterized in that the rotation is carried out with a radius and at an angle at which at least a predetermined portion of the glass fibers does not break. 3. The method according to claim 1 or 2, characterized in that the connected glass strands are subjected to a closure process. 4. The method according to one of claims 1 to 3, characterized in that after joining the glass strands, the preparation is applied. 5. The method according to one of claims 1 to 4, characterized in that the connection is carried out using a controlled air flow. 6. The method according to one of claims 1 to 5, characterized in that all the glass fibers move in each case only in one plane, except for their movement when connected. 7. A device for the manufacture of a glass fiber bundle connection comprising a rotating exhaust surface on which a stripping device is located, adjacent to which a forward-oriented guide device is adjacent, characterized in that the guide device (9) has at least partially a funnel-shaped structure (12 ), and the rotary section (10) has a deflecting cavity (16). 8. The device according to claim 7, characterized in that the guide device (9) has a rotary section (10) located behind the pickup device (8) and having a rotation angle of less than 120 °. 9. The device according to claim 8, characterized in that the turning radius is greater than the bending radius at which a predetermined part of the glass fibers breaks. 10. The device according to one of claims 7 to 9, characterized in that a finishing device (17) is located behind the guide device (9) in the direction of movement. 11. The device according to one of claims 7 to 10, characterized in that the glass filaments (4) are made of C-glass.

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