JPH0114699Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The belt-shaped needle-punched felt of this invention is suitable for applications that require water permeability or air permeability, such as cloth for running cloth dehydrators and dryer canvas for papermaking. It is used as an endless running belt.

(Prior art) As an endless running belt body used for cloth for cloth-running type dehydrators and dryer canvases for paper manufacturing, etc., synthetic fiber monofilament yarn or multifilament yarn is used for the warp and weft yarns to form a base fabric. A synthetic fiber web is layered on this base fabric and subjected to needling, and a large number of joining loops are formed at one end of the base fabric, and a large number of joining loops are formed at the other end of the base fabric. interlock alternately,
A belt-shaped needle punched felt is known, which is joined endlessly by inserting a joining core wire through these joining loops. Therefore, the above joining loop is made by first weaving a tape-shaped blind fabric with the warp threads removed from the center in the width direction using a narrow loom, then folding this blind fabric in half warply and making loops with the weft threads. , the selvedges are sewn to both ends of the base fabric, or the weft threads are extracted from the ends of the base fabric of the main body to extend the appropriate number of warp threads that make up the base fabric, and then folded back to form joining loops. It was created by sewing the thread ends into the main body using the same structure.

(Problems with the prior art) When a tape-shaped blind fabric is woven in advance, folded in half, and sewn to a base fabric, the sewn part is a three-layered layer of the base fabric and the folded tape-shaped blind fabric. Also, since it is impregnated or coated with resin etc. to strengthen the bond with the base fabric of the main body,
The thickness of this part becomes thicker than other parts, and this part hardens, and the inner part of the joining loop becomes hard and loses its flexibility, making it easy to break. decreased compared to
Dehydration becomes more uneven. On the other hand, if the weft threads at the end of the base are pulled out and the warp threads are folded back to create a loop, then the ends of the threads are sewn in, the thickness is uniform, but on the other hand, it requires a lot of effort and time to sew the threads together. It was uneconomical.

(Problems with the invention) This invention is a belt that can easily form joining loops, has a constant base fabric thickness over its entire length, has uniform flexibility, water permeability, and air permeability, and can withstand high loads. The present invention provides a shaped needle punched felt.

(Structure of the device) This device consists of a needle-punched felt with a woven fabric as the base fabric, and has multiple joining loops formed at one end of the base fabric and multiple joining loops formed at the other end of the base fabric. In the belt-shaped needle-punched felt, which is connected in an endless manner by interlocking the core wires alternately and inserting the joining core wire through these joining loops, the above-mentioned base fabric is connected in one direction so that both ends of the single-ply fabric are butted against each other. It is a two-layered product obtained by folding the fibers in two parts, and the joining loop is formed by removing the weft from the folded part, and the joining core wire is made of a large number of core wires. This is a belt-shaped needle punched felt characterized by being made of a bundled core wire of thin synthetic monofilament fibers. In addition, if the weft is pulled out at a distance of 1/4 of the total length from both ends of the single-ply fabric to form a sash-like part and then folded back at this sash-like part, the abutted parts of both ends will be located in the center of the base fabric. However, the position of this butt part is not limited to the center of the base fabric, and can be set arbitrarily. Further, the above-mentioned base fabric can be easily handled later by sewing the folded portion and the abutting portions of both ends before laminating the webs.

(Function) The above-mentioned belt-shaped needle punched felt is wound around the cylinder of a cloth traveling type dehydrator or paper making machine in an end-like state with the joining core wire removed.
By engaging the joining loops at both ends and inserting the joining core wire through these joining loops, they are joined in an endless manner. Next, the operation of the dehydrator etc. is started, but in belt-shaped needle-punched felt, the entire length of the base fabric is formed by stacking two layers of single-layer fabric, so there is very little difference between the felt body and the joint part. Therefore, there is no unevenness in flexibility, air permeability, water permeability, etc. over the entire length, and as a result, the belt-shaped needle punched felt runs smoothly and the moisture content of the cake etc. becomes uniform. Since a bundled core wire of thin synthetic fiber monofilament is used as the joining core wire, a joint with higher elasticity can be obtained than when thick synthetic fiber monofilament or steel wire is used. Therefore, when the joint is nipped with a strong nip pressure of 50 kg/cm or more using a dewatering roller or the like, this nip pressure can be received by the surface of the joint portion, and therefore, the breakage of the joining loop is significantly reduced.

(Example) In FIG. 1, a single-ply fabric 1 has a plain weave structure in which monofilament yarn or multifilament yarn of synthetic fibers are woven as warp yarns 2 and weft yarns 3, and the length ( It has a length approximately twice that of X+Y). At a portion x at a distance of X from one end of this single-ply fabric 1 and at a portion y at a distance of Y from the other end, weft yarns 3 in a section of 10 to 20 mm are extracted (see Fig. 2), and a sash-like shape made of only warp yarns 2 is extracted. After that, the above-mentioned single-layer fabric 1 is folded upward from the center of the blind upper part 1a on both sides (see Fig. 3), and both ends of the single-layer fabric 1 are butted together to form two upper and lower layers (see Fig. 4). ), create a single-ply fabric 1 that overlaps vertically at the butt part 1b, form a joining loop 5 by the blind part 1a,
The base fabric 6 is obtained by sewing and joining the vicinity of the butt portion 1b and the base of the blind portion 1a. Next, a transparent fabric (not shown) having bonding loops corresponding to the bonding loops 5 at both ends is interposed between one end and the other end of the base fabric 6. The joining loop 5 of the transparent fabric is engaged with the joining loop of the transparent fabric, and the joining core wire is inserted through these joining loops to connect them endlessly so that the abutting portion 1b is located on the outer surface, and then Afterwards, a synthetic fiber web 7 is layered on top of the base fabric 6 and needled.
The synthetic fiber web 7 and the base fabric 6 are integrally laminated and bonded, and further subjected to burning, heat fixing, resin processing, etc. as required, and then the transparent fabric is removed to form an end-shaped structure. At this time, the web 7 is moved so that one joining loop 5 is retracted from one end of the layer of the web 7 and the other joining loop 5 is protruded from the other end.
Cut the layers. Then, the obtained belt-shaped needle-punched felt 8 is wound around a group of rollers of a dehydrator, and as shown in FIG. The connecting loops 5 are engaged, and a diameter of 0.2 to 0.5
The above-mentioned belt-shaped needle punched felts 8 are connected in an endless manner by inserting joining core wires 9 made of bundled core wires of synthetic fiber monofilament with a diameter of mm in diameter. In this case, since the above-mentioned joining core wire 9 is a bundle of thin monofilaments, the seventh
As shown in the figure, the elasticity of the joint is superior to that of the joint core wire 10 made of thick synthetic fiber monofilament or steel wire with a diameter of 2 to 3 mm, and the nip can be held under strong pressure of 50 kg/cm or more. Even when the bonding loop 5 is broken, there is very little chance of breakage of the bonding loop 5.

(Experiment example) Nylon monofilament twisted yarn 330d/
Using 3/4 for the warp and weft, weave a plain weave single-ply fabric 1 with a warp density of 5.9 threads/cm and a weft thread density of 4.7 threads/cm, and use this single-ply fabric 1 to weave the third
A base fabric 6 as shown in the figure is created, and a web 7 made of nylon staples (first layer: 6d x 76mm,
2nd layer: 6d x 76mm + 30d x 51mm) with a basis weight of 800
Overlap them and apply needling so that they are g/m ² ,
Obtained belt-shaped needle punched felt 8
were joined in an endless manner using a bundled core wire made of nylon filament with a diameter of 0.2 mm as the joining core wire 9, and this is used as an example. Comparative Example 1 was also prepared in which a nylon monofilament having a diameter of 2 mm was used as the joining core wire 10 (see FIG. 7) instead of the joining core wire 9 of the bundled core wire. In addition, using the warp and weft yarns of the above examples, weft yarn density was doubled to weave a double weft base fabric, and separately from this, a tape-like fabric with the warp yarns in the center of the width removed using a narrow loom. A blind fabric is woven in advance, this blind fabric is warply folded in half, a joining loop is made with a weft thread, the edges are sewn to both ends of the base fabric, and a web is made in the same manner as in the above example. Comparative Example 2 is obtained by overlapping and needling and using a polyester monofilament with a diameter of 2 mm as a core wire for joining.

The belt-shaped needle punched felts of the above Examples, Comparative Examples 1 and 2 were attached to a nip press type dehydrator shown in FIG. 8, and the time until the joint part was damaged was measured. That is, the belt-shaped needle punching felt 8 before being joined with the joining core wire 9 or 10 is passed through the lower roll 10a for nip press, the guide rollers 11a, 11b, 11
c, 11d, wrapped around the upper roll 12a for dehydration, guide rollers 11e, 11f in order, joined as described above, and press roll 10b for nip press.
and the lower roll 12b for dehydration are respectively set, and a slurry of calcium carbonate (90% water content) 13 is supplied onto the belt-shaped needle punching felt 8 between the guide roller 11f and the nip press rolls 10a, 10b. between the lower roll 10a and press roll 10b for
The cake 14, which was dehydrated with a nip pressure of 50 kg/cm and transferred to the press roll 10b, is transferred to the scraper 15.
Scrape it off. Then, while running the belt-shaped needle-punched felt 8, water is jetted from the shower device 16 to wash the belt-shaped needle-punched felt 8, and the dewatering rolls 12a, 1
Dehydrate in step 2b. Comparative Examples 1 and 2 are also tested in the same manner. As a result, in the example, no change was observed after 1200 hours, whereas in comparative example 1, the joining loop was damaged after 480 hours, and in comparative example 2, both the sewing thread and the joining loop were damaged after 360 hours. was damaged.

(Effects of the invention) A single layer fabric is folded so that both ends are butted together to form a single base fabric, the fiber webs are overlapped and needle punched, and the bundled core wire is used as the joining core wire, so the joint part has elasticity. It has good properties, has no uneven thickness, has uniform hardness, air permeability, and water permeability over the entire length, and reduces damage to joints. Furthermore, since the joining loop is formed by removing the weft from the folded portion, the joining loop is extremely easy to form, resulting in labor savings. Furthermore, since the single-ply fabric is stacked in two layers as described above, the density of the warp and weft yarns of the single-ply fabric can be reduced to half that of the conventional base fabric, making it extremely easy to remove the weft yarns.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a vertical cross-sectional view of a single-ply fabric constituting the base fabric, and FIG. 2 is a vertical cross-sectional view of a part of the single-ply fabric for explaining the manufacturing method.
FIG. 3 is a longitudinal sectional view of the base fabric, FIG. 4 is an enlarged view of a part of FIG. 3, FIG. 5 is a longitudinal sectional view of the belt-shaped needle punched felt, and FIG. FIG. 7 is a sectional view of a joint in a comparative example, and FIG. 8 is a side view of a nip press type dehydrator. 1...Single woven fabric, 2...Warp, 3...Weft, 1a...Sash-like part, 1b...Butt part,
5... Loop for joining, 6... Base fabric, 7... Synthetic fiber web, 8... Belt-shaped needle punched felt, 9... Core wire for joining.

Claims (1)

[Scope of utility model registration request] It is made of needle-punched felt with a woven fabric as the base fabric, and a large number of joining loops formed at one end of the base fabric are alternately engaged with a number of joining loops formed at the other end of the base fabric, and these joining loops are interlocked alternately. In the belt-shaped needle-punched felt, which is connected endlessly by inserting a joining core wire through the loop, the above-mentioned base fabric is obtained by folding the long single-layer fabric in one direction into two parts so as to butt both ends together. The joining loop is formed by removing the weft yarn of the folded part, and the joining core wire is a bundled core wire of a large number of thin synthetic fiber monofilaments. A belt-shaped needle punched felt characterized by consisting of.