JPS6241395A - Papermaking needle felt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a papermaking needle felt (hereinafter referred to as felt) used in a papermaking machine.

[Conventional technology]

As paper machines have become faster, larger, and pressurized, the materials and structure of felt have undergone significant changes in order to increase its durability. Warp threads 33 of felt base fabric 31. The weft yarn 34 has changed from woolen yarn and multifilament twisted yarn to monofilament, and the base fabric structure of the felt has also changed from single weave to double weave,
It has been changed to a triple weave, and has a structure that is resistant to compression and does not easily flatten against the high pressures of paper machines.

Further, the batt layer 32 that is flocked to the felt base fabric 31 is often single-sided as shown in FIG. 7 in order to improve the water squeezing property and reduce the basis weight. In the case of a double-sided bat structure as shown in FIG. 8, if the thickness of the batt layer 32 on one side is the same as that of the single-sided bat as shown in FIG. becomes. Furthermore, if the felt having a double-sided batt structure as shown in FIG. 8 and the felt having a single-sided batt structure as shown in FIG. The mark problem occurs.

In general, lfl#1 of the felt base fabric 31 is shown in FIG.

As shown in Fig. 5, 3/1 collapsed warp double weave and 3/1 diagonal warp double weave are used. 3/1 Kosakumon Sutra 2 141i
The surface of (Figure 3) is a 3/1 collapsible oblique text! (Figure 4), 3/
The surface of 1 diagonal sutra double #1 (Fig. 5) has a 3/1 diagonal weave (Fig. 6).

[Problem that the invention seeks to solve]

In FIGS. 7 and 8, 3/
If you use a weave with a texture of 1.1 slanted warp, double n < Fig. 3), the warp will be 33. Due to the knotting order of the Li thread 34, the fourth
Warp 3, 5.7゜1 and weft 2', 3' in the figure
, 4', 1 are attached to each other, and the warp threads 1, 2 .
3, 4 and weft 1.

(Hereinafter, this condition will be referred to as bearing). When FEL I paper is made using the base fabric 31 in a bearing state,
This causes bearing marks on the paper, resulting in a decline in paper quality. In order to prevent this bearing mark, it is better to make the batt layer 32 thicker, but this results in poor water squeezing performance and a decrease in papermaking performance.

If the felt base fabric 31 is woven with Il#l of 3/1 diagonal warp double weave (Fig. 5), bearing marks will not occur, but due to the influence of the downward-sloping streaks on the paper machine. When the felt is turned in the direction of the thread, it tends to shift to the left side.

The object of the present invention is to obtain a needle felt for paper making that does not produce the above-mentioned bearings and does not shift to one side.

[Means for solving problems]

The present invention uses a base fabric 31 having a 3/1 chevron diagonal weave structure as shown in FIG.

The base fabric 31 has a 3/1 chevron diagonal warp double weave structure, and the first weft 1 is 1.2.4, 8, 9, 10.12, 16.
, 17, 18, 10. 24th warp 1, 2. 4, 8,
On 9, 10, 12, 16, 17.18, 10.24,
3, 5, 6, 7, 11. 13, 14, 15, 19, 21
, 22nd, 23rd warp 3, 5, 6, 7, 11, 13,
14° 15.19, 21.22.23, the second weft 2 is 2, 3, 4, 6.10, 11.12° 14.
15. 16th, 18th, 22nd, 23rd, 24th warp threads 2, 3
,4,6,10,11,12,14゜15.16,18
, 22, 23, 24 above, 1° 5.7, 8, 9, 13,
17th, 19th, 20th, 21st warp 1, 5, 7, 8, 9
, 13, 17, 19. 20. 21, the third weft 3 is 4° 5. 6. 7. 12. 13. 14. 16. 20
．． 21.22.24th warp 4.5.6.7.12°13.14.16.20.21.22.24 top, 1.
2.3.7.9, 10.11.15, 17°18.19
．． 23rd warp 1, 2, 3, 7, 9° 10. 11, 1
5, 17, 18, 19. Below 23, 4th weft 4
is 2.6,7,8.10°14.18,19.20,2
2nd warp 2,6°7.8,10,14,18,19
, 20. Above 22, 1, 3, 4, 5, 9, 11, 12,
13.15.16,17,21,23,24th warp 1°3.4,5,9,11,12,13,15. 16
It was woven under ゜17.21 and 23.24.

[For production]

3/1 Yamagata oblique sutra 2ff of the present invention! ! (FIG. 1), as shown in FIG. 2, the surface has continuous chevron-shaped stripes, and the stripes going down to the right and those going down to the left are evenly distributed. For this reason, a felt (No. 7 Even if the method shown in Fig.) is installed in a paper machine, the felt will not be uneven on the paper machine.

In addition, the surface of the 3/1 chevron diagonal weave two-m weave (Fig. 1) of the present invention is partially the same as the 3/1 diagonal sutra double R (Fig. 6), and the surface of the 3/1 diagonal sutra double R (Fig. It becomes a sentence. For this reason, the warp, #i! It does not form a thread bearing condition.

〔Example〕

1) Pick-up felt 1 for a velvet former paper machine that makes coated base paper (felt length dimension 30
m, width dimension 580cm, papermaking speed 1000TIL/min),
Conventionally, a base fabric with a 3/1 collapsible pattern double n (date 470g/rrt) was used, and a synthetic fiber batt (basis weight 938g/TIt) was flocked on one side of this base fabric (the side that will be in contact with the wet paper). felt (Figure 7) was used. In this case, the coated base paper that was made had bearing marks, which caused a decline in the quality of the coated base paper. When making coated base paper where bearing marks are a problem, , a bat made of synthetic fibers on both sides of the base fabric (fabric weight 102
8g/7r1. ) flocked felt (Fig. 8) was used. This resulted in a reduction in papermaking speed of 5 to 7%.

In this part, the 3/1 chevron oblique pattern double weave of the present invention (weighing 4
70g/m) is used, and on one side of this base fabric (the side where the wet paper comes into contact), roses 1~ (weighing 938g) made of synthetic MAN are used.
/TIt) flocked felt (Fig. 7) was used, and it was possible to maintain normal speed (・10
00 m/min).

2) Felt for the No. 3 press of a twin-bar paper machine that makes high-quality paper (felt length 19° on width 3)
95 (: l, papermaking speed 85,077 L/min), a base fabric with a conventional 3/1 crumbling pattern double weight (basis weight 560 g/g) was used, and one side of this base fabric (the side that would be in contact with the wet paper) was I! Felt made by flocking bats made of i-fiber (weighing 740 g/m) (
Figure 7) was used. In this case as well, the problem was that the bearing marks were attached to the coated base paper.

As a countermeasure to eliminate this bearing mark, we used 3/1 diagonal sutra duplex $1i (5659/rd) as a base fabric, and one side of the base (the side that would be in contact with the wet paper) with a synthetic m-fiber batt (wet weight 740 g/Wt). ) with flocked felt (Fig. 7) was used. As a result, the pair 1) ring mark was resolved, but the felt was shifted to the right side of the paper machine, and the edge of the felt came into contact with the paper machine frame, resulting in 11! I lost. For this reason, the lifespan of felt was reduced to 2 days instead of 40 days.

Next, the 3/1 chevron oblique pattern double weave of the present invention (weighing 560g
/T! t> as the base fabric, and a synthetic fiber bat (fabric weight 750
Felt (Fig. 7) made of flocked fibers (g/m) on one side of the base (the side that contacts the wet paper) was used. As a result, the bearing mark felt could be used satisfactorily without any deviation, and the life of the felt could exceed 40 days.

[Effects of the Invention] As explained above, by using the felt of the present invention, quality is improved by eliminating bearing marks on paper, prevention of poor water extraction caused by increased felt weight, prevention of decrease in papermaking speed, and unevenness of felt. The reduction in the lifespan of the felt due to wear of the felt ears due to this has been prevented.

[Brief explanation of the drawing]

Figure 1A is a tissue diagram of the 3/1 chevron diagonal warp double weave according to the present invention, the same day is a warp sectional view of the 3/1 chevron diagonal warp double weave according to the present invention, and Figure 2 is a warp cross-sectional view of the 3/1 chevron diagonal warp double weave according to the present invention. A diagram showing the structure development of the surface layer of the 3/1 chevron diagonal sutra double weave. Figure 3A is Figure 111 of the conventionally used 3/1 collapsed pattern double weave, and on the same day, the conventionally used 3/1
Figure 4 is a cross-sectional view of the warp of a 1/1 collapsed warp double weave, Figure 4 is a developed view of the texture of the surface layer of the conventionally used 3/1 collapsed warp double weave, and Figure 5 A is a piece of felt. The structure of the 3/1 diagonal warp double weave, which causes the felt to shift, is 3/1 which causes the felt to shift.
Figure 6 is a cross-sectional view of the warp of a 1/1 diagonal warp double weave, and Figure 6 is a diagram of the texture development of the surface layer of a 3/1 diagonal warp double weave that causes the felt to shift;
FIG. 7 is a schematic warp cross-sectional view of felt with batts flocked on one side of the base fabric, and FIG. 8 is a warp cross-sectional diagram of felt with batts flocked on both sides of the base fabric. 1-24...Warp 1-4...Weft 31...
Base fabric 32... Batt 33... Warp thread 34...
・Weft ゛-b1-To 1-To 1゛C1 dry- Fig. 3 Fig. 5 Fig. 4 Fig. 6 Fig. 7

Claims (2)

[Claims] (1) Needle felt for paper making, which is made by using a fabric having a 3/1 chevron diagonal double weave structure as a base fabric and flocking fiber batts on one surface of the base fabric. (2) For the base fabric of 3/1 chevron diagonal warp double weave, the first weft is 1, 2, 4, 8, 9, 10, 12, 16, 17, 18
, 20, above the 24th warp, 3, 5, 6, 7, 11,
Under the 13th, 14th, 15th, 19th, 21st, 22nd, and 23rd warp, the second weft is 2nd, 3rd, 4th, 6th, 10th, 11th,
12th, 14th, 15th, 16th, 18th, 22nd, 23rd, 24th warp top, 1st, 5th, 7th, 8th, 9th, 13th, 17th, 19th,
Under the 20th and 21st warp, the 3rd weft is 4, 5,
6, 8, 12, 13, 14, 16, 20, 21, 22,
Above the 24th warp, 1, 2, 3, 7, 9, 10, 11
, under the 15th, 17th, 18th, 19th, 23rd warp, 4
The th weft is 2, 6, 7, 8, 10, 14, 18, 19
, 20, above the 22nd warp, 1, 3, 4, 5, 9, 1
1, 12, 13, 15, 16, 17, 21, 23, 24
The needle felt for paper making according to claim 1, which is woven by passing under the second warp.