Industrial fabric with wear controlling means

FIELD: industrial fabric used in pulp-and-paper industry and associated branches of industry.

SUBSTANCE: industrial fabric comprises threads extending in the course of advancement of paper in machine, and threads extending traverse to course of advancement of paper in machine, said threads being interwoven so as to form woven structure. At least some of threads extending in the course of advancement of paper in machine and/or threads extending traverse to course of advancement of paper are threads having core filament surrounded with enclosure. Core filament and enclosure may be visually distinguished from one another by unaided eye, for example by color, so that wear of industrial fabric surface may be visually controlled during its service life on the basis of changing which is distinguished upon wearing and losses of enclosure from core filament.

EFFECT: provision for controlling wear of fabric in any point on its inner and outer surfaces.

5 dwg

 

1. The technical field

The invention relates to paper manufacture and similar types of production. More specifically, the invention relates to fabrics used in paper production, namely to the forming, press and dryer fabrics, collectively known fabrics for paper machines, in which the paper machine is the manufacture of paper. In addition, the invention can be used in other industrial facilities for dewatering material used industrial conveyor belts, for example, when washing and thickening of pulp and dehydrating sludge.

2. The level of technology

In the process of paper production, the cellulose fiber cloth by deposition of fibrous liquid mass, i.e. water dispersion of cellulose fibers on a moving forming fabric in the forming section of the paper machine. From the liquid mass through the forming fabric takes a lot of water and on the surface of the forming fabric, the cellulose fiber cloth.

Then the obtained cellulose cloth is moved from the molding part in the press section, in which there are a number of gaps between the press rolls. Pulp of fibrous cloth, carried a pressing cloth or, as often happens, placed IU the do two press fabrics, passes through these gaps, where subjected to strong compression, causing the water from him and pressed pulp fibers in the cloth together with each other, converting cellulosic fabric in a paper sheet. Water penetrates the bale of cloth or tissues and in the ideal case, the paper sheet is not returned.

After that, the paper sheet goes into the drying part that contains at least one row of rotating drying drums or cylinders heated by steam from inside. Formed paper sheet is sent by serpentine path sequentially around each dryer with a drying fabric that holds the paper sheet in tight contact with the surface of the drums. Heated drums to reduce the water content of the paper sheet to the desired level due to evaporation.

Forming, press and dryer fabrics for paper machines have the form of endless belts and act as conveyors. It should also be noted that the paper-making is a continuous process that goes with considerable speed, i.e. forming part of the fibrous liquid mass is continuously deposited on the forming fabric, and after exiting the dryer parts of the resulting paper sheet is continuously delivered in rolls.

Tissue paper machine, having a form of an endless belt, osobennosti their inner surface, when the machine is in operation are subjected to abrasive wear. Wear mainly occurs due to contact with the fixed elements of the paper machine. Ultimately, a large number of tissues have to be removed from the paper machine, when the wear caused such a movable contact, reduces the thickness of the fabric at least in some places so that the fabric is weakened or loses some properties or characteristics that are desirable when it is used for a particular purpose.

Usually wear control by using a thickness gauge. However, the thickness is difficult to measure the thickness of the fabric for a paper machine at a distance greater than one or two feet (to 30.5-61 cm) from the edges, particularly when the fabric moves in the car.

Therefore, for paper production, it would be desirable to be able to control wear fabrics for paper machines, in particular, at any point on its inner and outer surfaces, even on a running machine. This opportunity offers the present invention.

The INVENTION

Accordingly, the invention relates to industrial fabrics from a variety of fabrics used in paper-making or similar industries for dewatering material is a fabric. Industrial fabric contains yarns, R is polozhenie in the course of the paper in the machine, and threads located across a stroke of paper in the machine that can intertwine with each other, forming the woven structure of the industrial fabric.

At least some, and possibly all, of the threads located along the paper in the car, or at least some, and possibly all, of the threads located across a stroke of paper in the car, or as threads, located along the paper in the machine and thread, located across a stroke of paper in the car, have the thread-core, surrounded by a shell. This thread is the core and the surrounding shell is visually distinguishable to the naked eye, for example, by color. This allows visual inspection of surface wear industrial fabrics during her lifetime, since the abrasion leads to a gradual deterioration of the membrane over the exposed parts of the thread, especially in places where there are convex, and the thread-core becomes visible and distinguishable, for example, by color.

Below the invention is described in more detail with reference to accompanying drawings.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 shows a perspective view of industrial fabrics;

figure 2 shows a side view of the thread that contains the thread-the core and the shell;

figure 3 shows a section along the line 3-3 in figure 2;

figure 4 shows a cut neiskushennoi industrial fabric in the direction along the paper machine; and

figure 5 until the an incision, similar to section 4, the worn industrial fabrics.

A DETAILED DESCRIPTION of the PREFERRED embodiment of the INVENTION,

Figure 1 shows a perspective view of an industrial fabric 10, which can be improved according to the present invention. For use in the machine shown the industrial fabric 10 must be in the form of an endless belt. The fabric 10 has an inner surface 12 and outer surface 14. It can be woven or in the form of an endless belt, or with such a form, which allows us to give the fabric the form of an endless belt when installed in the machine for which it is intended, by joining the edges of the fabric with the formation of the seam 18. Industrial fabric 10 may also be manufactured by a modified endless weaving, in which the result is a fabric with multiple suture loops on the two transverse edges to connect them together with the formation of an endless belt.

As a rule, industrial fabric 10 is a structure made of main and weft threads, however, the scope of the invention is not limited to woven fabrics, and includes non-woven fabric. As is well known to specialists in this field, fabric 10 made endless ways or modified endless weaving, the main thread is located across a stroke of paper in the machine, and in the Kani 10, made of flat weaving, the main thread is located along the paper in the machine. The weft yarn located downstream of the paper in the machine if the fabric 10 is received or infinite oficialbnym weaving, and move across the paper in the machine if the fabric 10 is obtained by flat weaving.

At least some of the threads located along the paper machine and/or at least some of the threads located across a stroke of paper in the machine, are the threads 20 with thread-core 22 and the surrounding shell, as shown in figure 2 and 3.

Figure 2 shows a side view of a filament 20, and figure 3 it cut.

Although figure 3 strand core 22 is shown as a single-fibre thread, it can be single-fibre thread, folded/twisted single-fibre thread, multi-fiber yarn, folded multi-fiber yarn, braiding yarn, or knitting thread. If the thread is the core 22 is a single-fibre thread, it may have a circular or noncircular cross section, including oval, elliptical, square, rectangular and radar cross section. Thread-core 22 can be obtained by extrusion or other means from any polymeric resin material, which is typically used in the art in the manufacture of yarns for technical textiles, for example, from polyamide, polyester, poliey the ketone, polypropylene, polyaramid threads, polyolefin and polyethylene terephthalate (PET) resins. Made so the threads together in the thread-core 22 by methods known in the textile industry, particularly in the field of manufacturing of industrial fabrics.

Thread-core 22 surrounded or coated 24. The shell 24 may be a coating of any of the above mentioned polymeric resin materials. If the thread is the core 22 is a single-fibre filament, the coating can be applied using an extruder with a T-shaped head, forming a sheath 24. The shell 24 may be created by wrapping films or fibers from one of the above polymeric resin material around the threads of the core 22. Thread-core 22 and the shell 24 can be made of the same polymeric resin material or from different polymeric resin materials.

Consisting of threads of the core and the shell thread 20 gives the paper manufacturer the ability to control the wear of the fabric, because, according to the invention, the shell 24 and the thread of the core 22 can be distinguished from each other visually by the naked eye. Preferably, if the shell 24 and the thread-core 22 have different contrasting color, so that when the surface of the industrial fabric 10 is worn to the point that Obolo is erased and 24 and open thread-the core 22, wear and tear could be seen. For example, the thread-core 22 may have a bright color, and the shell 24 may contain a white pigment such as titanium dioxide, which hides the color of the thread-core 22 as long as the shell 24 will not be sufficiently erased and will not strip the threads of the core. Alternatively, the thread-core 22 may be made of a material which changes its color under the influence of heat and/or humidity, so that when the surface of the industrial fabric 10 will be erased enough and opens the thread-core 22, the latter will change color, allowing you to visually determine the fact of wear and tear. With the same purpose may be used dyes as indicators of PH, is well known to specialists in this field, such as phenolphthalein or litmus paper. According to another alternative, the thread-core 22 may contain a dye, chuvstvitelny to ultraviolet radiation, which in the case of wear of the shell 24 will be visible when exposed to ultraviolet light source.

Usually the most prone to wear convex space on the surface of the industrial fabric 10, which is where the threads are located in the tissue in one direction, pass over the threads located in the other direction, and on the surface of the fabric formed by raised dots. Figure 4 shows a cut neiskushennoi industrial fabric 10 in the direction of the tion of the progress of the paper in the machine. Located along the paper machine thread 30, which represents a thread 20 that contains the thread-the core and the shell depicted twisted smooth weave with spaced transversely move the paper in the machine threads 32, which also represent the threads 20 that contains the thread-the core and the shell. Convexity 34 form the point of greatest wear.

After using the cloth 10 for some time, it will appear in the section as shown in figure 5. The shell 24 threads 30 located along the paper in the car, worn to the point that visible thread of the core 22. Due to the fact that the thread-core has a different color than the shell, the fact that the thread-core 22 is visible evidence of wear of the fabric 10.

The invention allows the technician to monitor the status of industrial fabric 10 even when it is moving in the machine for which it is intended. This specialist can monitor the wear across the width of the fabric and discover a worn strip that are specific areas where the wear is more severe or occurs faster than in other areas.

The invention can be used in fabrics for paper machines, namely, in the forming, press and dryer fabrics, as well as in other tapes used in paper production, for example in flax the Ah for drying by blowing air, bale tapes with long clamp area, calender belts and conveyor belts. The invention can also be used in many other industries that use strips of woven fabrics, with washing of the pulp, sludge dewatering and in the manufacture of nonwovens. It can also be used in the feed for two press thickener used in the production of pulp.

Modifications of the described variants obvious to a person skilled in this field, however, these modifications should be within the scope of the invention, which is determined by the formula.

1. Industrial fabric from a variety of fabrics used in paper manufacturing and related industries, as well as in other industries, where the fabric is used for dehydration of any material containing threads located along the paper in the machine and thread, located across a stroke of paper in the car, while at least some of these threads located along the paper machine, or one of the specified threads located across a stroke of paper in the machine, the thread containing the thread-core, surrounded by a shell; the thread-core and jacket are made distinguishable from each other so that the wear surface of the specified industrial TC is nor can be controlled during its lifetime.

2. Industrial fabric according to claim 1, in which at least some of the threads located along the paper in the car, and some of the threads located across a stroke of paper in the machine, the thread containing the thread-core, surrounded by a shell.

3. Industrial fabric according to claim 2, in which all the threads located along the paper in the car, or all the threads that are located across a stroke of paper in the machine, the thread containing the thread-core, surrounded by a shell.

4. Industrial fabric according to claim 1, in which all the threads located along the paper in the car, and all the threads that are located across a stroke of paper in the machine, the thread containing the thread-core, surrounded by a shell.

5. Industrial fabric according to claim 1, in which the thread-core selected from the group comprising single-fibre thread, folded/twisted unifiber thread, multi-fiber yarn, folded multi-fiber yarn, braiding yarn and knitting thread.

6. Industrial fabric according to claim 1, in which the thread-core made of a polymeric resin material.

7. Industrial fabric according to claim 6, in which the specified polymeric resin material selected from the group comprising polyamide, polyester, polyetherketone, polyaramid threads, polypropylene, polyolefin and polyethylene terephthalate (PET) resin.

8. Industrial is Cagnes according to claim 1, in which the thread-core is a single-fibre thread with a circular cross section.

9. Industrial fabric according to claim 1, in which the thread-core is a single-fibre thread with a non-circular cross-section.

10. Industrial fabric according to claim 9, in which the specified non-circular cross-section selected from the group including oval, elliptical, square, rectangular and radar cross section.

11. Industrial fabric according to claim 1, in which the shell is made of a polymeric resin material.

12. Industrial fabric according to claim 1, in which the specified polymeric resin material selected from the group comprising polyamide, polyester, polyetherketone, polyaramid threads, polypropylene, polyolefin and polyethylene terephthalate (PET) resin.

13. Industrial fabric according to claim 1, in which the shell is a coating on a filament-core.

14. Industrial fabric according to claim 1, in which the membrane is a film of a polymeric resin material, wrapped around a thread core.

15. Industrial fabric according to claim 1, in which the shell is a fiber from a polymer resin material, wrapped around a thread core.

16. Industrial fabric according to claim 1, in which the thread-the core and the cladding are made of the same polymer resin mother is La.

17. Industrial fabric according to claim 1, in which the thread-the core and the cladding are made of different polymeric resin materials.

18. Industrial fabric according to claim 1, in which the thread-the core and the shell have different color.

19. Industrial fabric according to claim 1, in which the color of the thread-core under the action of temperature or humidity is different from the color of the shell.

20. Industrial fabric according to claim 1, in which the strands located along the paper in the machine, interwoven with threads positioned across the progress of the paper in the machine, with the formation of this industrial fabric.

21. Industrial fabric according to claim 19, in which the thread-core contains the dye is a pH indicator.

22. Industrial fabric according to claim 1, in which the thread-core contains a dye that is sensitive to ultraviolet radiation.

23. Industrial fabric according to claim 1, in which the shell contains a dye-based titanium dioxide.



 

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