JPH059888A - Dryer canvas having reinforced selvedge part - Google Patents

Abstract

PURPOSE:To obtain a dryer canvas having reduced frictional loss of a palm made of ceramics and improved durability. CONSTITUTION:Aromatic polyamide yarns are arranged and inserted into at least part of warp 11 or weft 12 of a selvedge part of a dryer canvas or replaced and inserted and the selvedge part is coated with a resin to integrate texture of the selvedge part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dryer canvas which is excellent in abrasion resistance for the purpose of preventing wear of the ears used in a dryer part using a ceramic palm as a dryer canvas of a papermaking machine. The palm is an automatic guide for a dryer canvas.

[0002]

2. Description of the Related Art In a dryer part of a paper making machine, a material of palm which is an automatic guide for a dryer canvas is ceramics from the viewpoint of wear resistance (Japanese Utility Model Publication No. 58-12879). Actual Kaisho 6
No. 1-164300, etc.).

In addition, a dryer canvas is often woven from monofilament yarns or multifilament yarns made of synthetic fiber from the viewpoint of dryness and durability of wet paper, and synthetic fibers include polyester and poly. Acrylic and nylon are commonly used.

[0004] Palm has improved wear resistance by using ceramics on the contact surface with the dryer canvas, while dryer canvas causes the high hardness and low heat transfer coefficient of the ceramic particles. As a result, the ear portion, which is the contact surface with the ceramic, is abraded by friction and frictional heat, and the durability of the dryer canvas is reduced.

In particular, this phenomenon of abrasion tends to increase with the speeding up of the papermaking machine, which has become an important problem in the operation of the papermaking machine.

[0006]

As described above, the conventional dryer canvas has a problem in the durability of the canvas due to the wear of the ears.

[0007] The present inventor has conducted various studies and tests to find out how to reduce the wear of the ears of the dryer canvas when the contact surface of the palm with the dryer canvas is ceramic. The present invention has been reached, and the purpose thereof is to improve the durability of the dryer canvas by extending the ears of the dryer canvas even if it is a palm made of ceramic, and to improve the life of the dryer canvas. The aim is to provide an even improved dryer canvas.

As the palm, there is one in which ceramic powder is sprayed on a metal plate or one in which ceramic is attached to a substrate, and the contact surface with the dryer canvas is formed of at least ceramic.

[0009]

In order to achieve the above object, the present invention is used in a dryer part of a papermaking machine equipped with an automatic guide for a dryer canvas, at least a contact surface of which is made of a ceramic, and a synthetic fiber. In a dryer canvas in which the monofilament yarn or the multifilament yarn of is used for the warp or the weft,

Aromatic polyamide fibers are inserted into at least a part of the warp or weft of the selvages by aligning or replacing them, and a resin is applied to the selvages to integrate the selvages of the selvages. It was done.

[0011]

[Function] Aromatic polyamide fiber has high heat resistance and tensile strength, alkali resistance, good wet heat resistance and dry heat resistance, and has a high melting point, but it is difficult to reduce abrasion with this fiber alone. .. However, if this is inserted by aligning it with a part of the warp or weft of the ear portion of the dryer canvas, or by inserting it by replacement, and applying resin to this ear portion to integrate the tissue of the ear portion, The wear resistance and durability of the ears are significantly improved.

[0012]

EXAMPLE FIG. 1A is a longitudinal sectional view of an ear portion of a double-woven canvas according to the present invention, B is a longitudinal sectional view of an ear portion of a triple-woven canvas, (11) is a warp thread, and (12) is a longitudinal sectional view. Indicates a weft.

Example 1 Warp: Main body (D200d / 4 + T250d / 1) / 3 Reinforcing yarn, TEC1000d / 3 Weft: (Ack200d / 2 + T250d / 2 + N21)
0d / 2) / 4 Density: Weft 13.0 × 2 / 2.54cm, Warp 34.9 / 2.54cm

[Example 2] Warp: Main body, same as Example 1 Reinforcing yarn, TEC200d / 3 + T250d / 2) / 3 Weft: Same as Example 1 Density: Same as Example 1

[Example 3] Warp: Main body, TM040 Reinforcing yarn, TEC200d / 3 Weft: Front and back, TM050, (T250d / 2 + N210d / 3) / 4 Density: Weft 15.5 × 3 yarns / 2.54 cm Warp 84 .3 / 2.54 cm

[Example 4] Warp: Main body, same as in Example 3 Reinforcing yarn, TEC1000d / 1 Weft: Same as Example 3 Density: Same as Example 3

In each of the above examples, D and Ack are acrylic, T is polyester, and TEC is Technora (registered trademark) in aromatic polyamide fiber as a reinforcing thread. N is nylon, TM is polyester monofilament yarn, and 040 and 050 are 0.4 mm each.
φ and 0.5 mmφ are shown. And
Examples 1 and 2 are Nos. 1 and 8 among the heald numbers 1 to 8 represented by Arabic numerals on the left side of the warp (11) on the selvage of the double-woven canvas shown in FIG. 1A. 4, 6
The reinforcing yarn is inserted in place of the warp yarn (11). In addition, in Example 3 and Example 4, among the warp yarns (11) of the ear portion of the triple-woven canvas shown in FIG.
Reinforcing yarns are inserted into the warp yarns (11) of o, 1, 3, 4, 6 by aligning them. In each of the examples, a reinforcing thread is inserted with a width of 10 cm at the ears, and after weaving, a polyurethane resin is applied to integrate the tissues of the ears.

Although the width of the reinforcing yarn is set to 10 cm in the embodiment, this width may be larger than the minimum resin coating width.

Next, in order to confirm the effects of the present invention, a material canvas (20) having various ear reinforcement conditions was prepared, and as shown in FIG. 2A, a starting roll (21) and a guide roll. (22) (23) and tension roll (2
4) Endlessly stretched between them, and a running test was performed for 20 hours at a tension of 1.85 Kg / cm and a running speed of 600 mm / min, and palms (2
5) (25) was pressed through the spring (26) with a force of 3 kg to measure the amount of wear on the ears. In this case, the sample canvas (20) was made of the double weave of Example 2 as shown in FIG. 2C with a length of 4 m and a width of 20 cm, and the ear (20a) on one side.
The reinforcing thread (TEC) is inserted over the width of 40 mm, and the reinforcing thread (TEC) is not inserted in the ear portion (20b) on the other side.
And half of the length, that is, the left half of both ears of the canvas is processed with polyurethane resin (PUR) over a width of 20 mm, and the right half of both ears is unprocessed (no resin processing). It was done. As a result, the result shown in FIG. 3 was obtained.

FIG. 4 shows a double weave of Example 2 in which the ears are reinforced with a reinforcing thread (TEC) and processed with an epoxy resin (EP), and an epoxy without a reinforcing thread (TEC). The same running test results as those processed with resin (EP) are shown.

FIG. 5 shows a double weave of Example 2, in which the ears are reinforced with a reinforcing thread (TEC) and processed with a polyurethane resin (PUR), and without the reinforcing thread (TEC). It shows the same running test results as those processed with polyurethane resin (PUR). In this case, the length of the canvas is 4m.

Further, FIG. 6 shows the double weave of Example 2 in which the ears are reinforced with a reinforcing thread (TEC) and processed with an epoxy resin (EP), and without the reinforcing thread (TEC). ,
The same running test results as those processed with epoxy resin (EP) are shown, and the length of the canvas in this case is 4
m.

Although the above embodiment has shown the case where the reinforcing yarn (TEC) is inserted into the warp yarn of the ear of the canvas and reinforced with the resin, the present invention inserts the reinforcing yarn (TEC) into a part of the weft yarn. You may. For example,

(Ack200d / 2 + T250d / 2 +
N210d / 2) / 4 to (Ack200d / 2 + TE
C1000d / 1) / 4 or (Ack2
00d / 2 + T250d / 2 + N200d / 2) / 4.

In the case of the double weave, only the weft layer on the paper contact side or only the weft layer on the non-paper contact side, or
Reinforcing yarns (TECs) may be inserted in both weft layers as described above. In this case, it may be used together with the reinforcing yarn insertion of the warp yarn. Alternatively, only the weft thread may be projected on both sides by about 5 mm. In either case, the ear portion is impregnated and cured with a resin.

In the case of a triple weave, the weft yarns in the middle layer are (T250d / 2 + N210d / 3) / 4 to (T25d
It may be 0d / 2 + TEC200d / 3) / 4. In this case, it may be used together with the reinforcing yarn insertion of the warp yarn. And
A resin is impregnated and cured in the ears. When the reinforcing yarn (TEC) is inserted in the weft layer,
The reinforcing yarn (TEC) may be inserted into the wefts at appropriate intervals, such as every other weft, instead of all the wefts. The resin applied to the ears may be another resin such as an ultraviolet curable resin.

Although Technora (registered trademark) was used as the reinforcing yarn in the examples, the present invention is not limited to this and it is needless to say that aromatic polyamide fiber may be used.

[0028]

According to the present invention, even in the case of a palm made of ceramics, the wear of the ears of the dryer canvas is reduced and the durability can be improved.

[Brief description of drawings]

FIG. 1A is a vertical sectional side view of an embodiment in which the present invention is applied to a double-woven canvas. B is a vertical sectional side view of an embodiment in which the present invention is applied to a triple-woven canvas.

FIG. 2A is a schematic side view of the running test device, B is a front view of a palm portion, and C is an explanatory view of a sample canvas.

FIG. 3 is a comparative graph of running test results of an example of the present invention.

FIG. 4 is a comparative graph of running test results of an example of the present invention.

FIG. 5 is a comparative graph of running test results of an example of the present invention.

FIG. 6 is a comparative graph of running test results of an example of the present invention.

[Explanation of symbols]

 11 warp 12 weft

Claims (1)

Claim: What is claimed is: 1. A monofilament yarn or a multifilament yarn of synthetic fiber, which is used for a dryer part of a paper machine equipped with an automatic guide of a dryer canvas in which at least a contact surface with the dryer canvas is made of ceramic. Alternatively, in a dryer canvas used for wefts, the aromatic polyamide fibers are aligned or inserted into at least a part of the warp or the weft of the selvages, and the selvages are applied with a resin, and a resin is applied to the selvages. Dryer canvas with reinforced ears characterized by integrating the tissue of the parts.