JP3425605B2 - Double layer woven fabric used for papermaking felt and papermaking felt - Google Patents

Abstract

A papermaker's felt (28) having a dual layer base with a high absorption capacity with a weave pattern having twice as many machine direction yarns on the top side (25) of the fabric as compared to the bottom side (26) of the fabric. The yarns may be spun yarns, multi-filaments, monofilaments, core-wrapped yarns and any kind of twists. Treated and extruded yarns may also be used. The base fabric is attached to a top fabric (27) by needling. <IMAGE>

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a papermaking felt used in a papermaking machine, and a double-layer woven fabric used for the papermaking felt, and particularly when a paper sheet is held and moved on the felt. The present invention relates to a papermaking felt for removing moisture from the sheet, and a double-layer woven fabric used for the papermaking felt.

[0002]

BACKGROUND OF THE INVENTION Various techniques have been proposed to date for removing moisture from paper sheets. The most common of them is the use of a press, which squeezes out moisture between a plurality of rollers of a paper sheet and a felt carrying the paper sheet. The felt is formed such that the water squeezed out from the paper passes through the felt and is drained. The felt for the press is preferably woven with relatively large holes or gaps in order to enhance the water transfer capacity, and the water is removed from the felt through the suction box. The press felt usually has the shape of a conveyor belt, and a large amount of water in the manufacturing process is accumulated in the press felt, and a suction device or other device is usually used for the paper web and the press felt. The water is removed after they are separated.

[0003]

On the other hand, an ideal papermaking felt has at least the following characteristics. First, the surface must be fine enough that the quality of the paper produced is smooth and does not create disturbed patterns. Second, it must have sufficient water permeability so that it can be drained without significant resistance.
Further, it must have a restoring force sufficient to quickly restore the use condition under high pressure that is repeated over a long period of time. Furthermore, it must be robust enough to have good stability and long life.

Higher vibration absorption capacity (v
ibration absorption capaci
The papermaking felt with the base fabric with ty) has better runnability, less maintenance outages and
It has been discovered to provide superior paper quality.

However, the conventional papermaking felts do not have sufficient vibration and moisture absorption capacity, and have excellent stretchability and resilience that reliably provide excellent running performance, less maintenance stoppage, and improved paper quality. Could not be provided.

Accordingly, one object of the present invention is to provide a papermaking felt for use in papermaking machines, and a double layer woven fabric for use in the papermaking felt, having improved vibration absorption capacity. .

Another object of the present invention is to improve running performance,
It is an object of the present invention to provide a papermaking felt having excellent stretchability and resilience that ensures less maintenance outages and improved paper quality, and a double layer woven fabric for use in the papermaking felt.

Yet another object of the present invention is to provide a papermaking felt having improved drainage properties, and a double layer woven fabric for use in the papermaking felt.

Still another object of the present invention is to provide a felt that operates at high speed under a large load with a more excellent wet felt property and has a restoring force effective for a longer period of time. And to provide a double layer woven fabric for use in papermaking felts.

Other objects and advantages of the present invention will become apparent from the following detailed description of the invention and the accompanying drawings.

[0011]

One embodiment of the present invention is a papermaking felt having a double layer woven fabric, said double layer woven fabric being woven in a special weave pattern and having energy absorbing properties. Will be things. The double layer woven fabric is woven in a pattern such that the number of machine direction yarns on the upper surface is twice the number of machine direction yarns on the lower surface of the double layer woven fabric. The woven yarn used may be spun yarn, multifilament, monofilament, core wrap yarn, or any twisted yarn.

Double-layer woven fabrics are top fabrics.
ic). The preferred top woven fabric is a single layer woven fabric having a long floating component and a fine yarn component.

Felts having a double-layered woven fabric with a special weave pattern exhibit very good vibration absorption capacity compared to ordinary felts. High elasticity and resilience provide excellent runnability, fewer maintenance outages, and improved paper quality. The properties reduce resistance to liquid flow and provide better dewatering performance. When the double-layer woven fabric is used together with the upper woven fabric, it becomes suitable for the paper quality (weight, surface) and press conditions (speed, pressure, runnability) required for the felt. In addition to being used as an element in papermaking felts, the double-layer woven fabric is used in forming machines in papermaking machines.
ic) can also be used.

In a second embodiment, the bilayer woven yarn is treated with an elastic resin or polymeric material having excellent moisture absorption properties or is extruded.
ed). Materials include monofilament or multi / monofilament twist yarns in the machine direction, which may be treated with an elastic resin (polyurethane, latex, polyacrylic, etc.) or molded. An example of a suitable fiber is a thermoplastic polyester elastomer (TPE). The specially treated yarn is provided in the machine direction for improved vibration and moisture absorption capacity (vibra).
There is provided a woven fabric for papermaking having a tension damping ability).

Specifically, the invention according to claim 1 is
"A double-layer woven fabric used in a papermaking machine, having a top surface (25) and a bottom surface (26) composed of six harnesses, arranged in order, first, second, third, 4th, 5th and 6th cross machine direction yarns (1-6) and 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th arranged in order , The tenth, eleventh and twelfth upper machine direction yarns (7, 8, 10, 11, 13, 14, 1
6, 17, 19, 20, 22, 23) and the first, second, third, fourth, fifth and sixth lower machine direction yarns (9, 12, 15, 18, 21, 24), the weave pattern being for each cross machine direction yarn (1-6), the upper machine direction yarn (7, 8, 10, 1).
1, 13 , 14 , 16 , 17 , 19 , 20 , 22 , 2
3) with each and the lower machine direction yarns (9, 12, 15, 1)
8,21,24) are repeated for each, you to each harness
And the upper machine direction yarns (7, 8, 10, 11, 13,
14、16、17、19、20、22、23) 2 weave
Each time it is loaded, the lower machine direction yarns (9, 12, 1
5, 18, 21, 24) is woven one
In the first harness, the first, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth and twelfth upper machine direction yarns (7, 10, 11, 13, 14, 16, 1
7, 19, 20, 23) are woven onto the first cross machine direction yarn (1) and the second and eleventh
Upper machine direction yarns (8, 22) are woven underneath the first cross machine direction yarn (1) to form a top surface (25), the first, second, fourth, fifth and A sixth lower machine direction yarn (9, 12, 18, 21, 24) is woven underneath the first cross machine direction yarn (1) and the third
A lower machine direction yarn (15) is woven over the first cross machine direction yarn (1) to form a lower surface (26),
In the second harness, the first, second, third, fourth, fifth, sixth, seventh, eighth, tenth and eleventh upper machine direction yarns (7, 8, 10, 11, 13). , 14, 16, 17,
20 and 22) are woven onto the second cross machine direction yarn (2) and the ninth and twelfth upper machine direction yarns (19, 23) are combined into the second cross machine direction yarn (2).
Woven under to form an upper surface (25), said first, third, fourth, fifth and sixth lower machine direction yarns (9,
15, 18, 21, 24) are woven underneath the second cross machine direction yarn (2), while the second lower machine direction yarn (12) is woven under the second cross machine direction yarn (2). ) To form the lower surface (26), and in the third harness, the first, second, third, fourth, fifth, sixth, eighth, ninth, eleventh, and eleventh 12 upper machine direction threads (7,
8, 10, 11, 13, 14, 17, 19, 22, 2
3) is woven onto the third cross machine direction yarn (3) and the seventh and tenth upper machine direction yarns (16, 20) are of the third cross machine direction yarn (3). Woven underneath to form the upper surface (25), said second,
Third, fourth, fifth and sixth lower machine direction yarns (12, 1,
5, 18, 21, 24) are woven underneath the third cross machine direction yarn (3), while the first lower machine direction yarn (9) is woven under the third cross machine direction yarn (3). ) woven on <br/> of constitutes a lower surface (26), in the fourth harness, the second, third, fifth, sixth, seventh, eighth, ninth, tenth, Eleventh and twelfth upper machine direction yarns (8,
10, 13, 14, 16, 17, 19, 20, 22, 2
3) is woven onto the fourth cross machine direction yarn (4) and the first and fourth upper machine direction yarns (7, 11) are of the fourth cross machine direction yarn (4). Woven underneath to form the upper surface (25), said first, second, third, fifth and sixth lower machine direction yarns (9, 12,
15, 21, 24) are woven underneath the fourth cross machine direction yarn (4) and the fourth lower machine direction yarn (18) is of the fourth cross machine direction yarn (4).
Woven on top to form the lower surface (26) and in the fifth harness, the first, second, fourth, fifth, seventh, eighth, ninth, tenth, eleventh and twelfth Upper machine direction thread (7,
8, 11, 13, 16, 17, 19, 20, 22, 2
3) together are woven over the cross machine direction yarns of the fifth (5), the upper machine direction yarns of said third and sixth (1
0, 14) is woven underneath the fifth cross machine direction yarn (5) to form the upper surface (25) and the first, second, third, fourth and sixth lower machine directions. Thread (9, 12, 1
5, 18, 24) is the fifth cross machine direction yarn (5)
With woven under the fifth lower machine direction yarns (21) woven on the fifth cross machine direction yarns (5), constitutes the lower surface (26), in the sixth harness , The first, second, third, fourth, sixth, seventh, ninth,
The tenth, eleventh and twelfth upper machine direction yarns (7, 8,
10, 11, 14, 16, 19, 20, 22, 23) are woven onto the sixth cross machine direction yarn (6), and the fifth and eighth upper machine direction yarns (13, 1).
7) is woven underneath the sixth cross machine direction yarn (6) to form a top surface (25), said first, second, third, fourth and fifth lower machine direction yarns (9, 12, 15,
18, 21) are woven underneath the sixth cross machine direction yarn (6) and the sixth lower machine direction yarn (2) is
4) is a double-layer woven fabric used in a papermaking felt, characterized in that it is woven on the sixth cross machine direction yarn (6) to form a lower surface (26).

The invention according to claim 2 is that "a part of the machine direction yarn is a monofilament made of a polymer having a vibration and moisture absorption property, and the double layer woven fabric used for the felt for papermaking according to claim 1 It is.

The invention according to claim 3 is "a double-layer woven fabric used for a papermaking felt according to claim 2, characterized in that a part of the machine direction yarn is a monofilament made of a thermoplastic polyester elastomer". is there.

The invention according to claim 4 is "a felt for papermaking, wherein an upper woven fabric is sewn to the double-layer woven fabric according to any one of claims 1 to 3."

[0019]

According to the constructions described in the above claims, it is possible to provide a woven fabric having an improved vibration absorbing ability and used in a papermaking machine.

The present invention can provide a felt having superior stretchability and resilience that ensures even better runnability, less maintenance outages and improved paper quality.

The present invention can also provide a papermaking felt having improved drainage properties.

The present invention can provide a felt having an effective restoring force for a longer period of time in order to impart more excellent wet felt characteristics to a felt that operates at high speed under a larger load. .

[0023]

The present invention has been described based on the following preferred embodiments, but the embodiments are not intended to limit the scope of the present invention. On the contrary, the intention is to cover all modifications and equivalents within the spirit and scope of the invention as defined by the appended claims.

Preferred embodiments of the present invention will be described below.

The papermaking felt of the first embodiment comprises a combination of an upper woven cloth 27 shown in FIG. 3 and a double-layer woven cloth 28 of a special pattern weaving which has improved moisture absorption characteristics. The double layer woven fabric 28 functions as a forming fabric for use in a papermaking machine or the upper woven fabric 2
Combines with 7 to function as a papermaking felt. This double layer woven fabric is made from a fabric having a series of machine or cross machine direction yarns in one or more planes. Double layer woven fabrics are manufactured in two basic ways to form endless belts. First, a well-known method for manufacturing an endless belt can be used to manufacture the endless belt in a plane weaving procedure by matching both ends thereof. Alternatively, it is also possible to weave directly into a continuous belt by the endless weaving procedure. Both of the above procedures are well known in the art, and as used herein, "endless belt" refers to a belt made by any of them.

In a double-layer woven fabric, the warp threads are machine direction (M
D) and the weft threads extend in the cross machine direction. In an endlessly woven double layer fabric, the warp yarns extend in the cross machine direction (CMD) and the weft yarns extend in the machine direction. As used herein, "machine direction" and "cross machine direction" refer to the direction of travel of the papermaking fabric in the papermaking machine and its transverse direction, respectively.

FIG. 1 is a weave pattern diagram showing the weave pattern of the double layer woven fabric of the present invention with six harnesses. The six horizontal directions (1 to 6) in the figure represent six cross machine direction yarns. The machine direction columns 7 to 24 represent 18 machine direction threads. The X in the figure indicates where the machine direction yarns are woven underneath the cross machine direction yarns shown there. The O marks in the figure indicate where the machine direction threads are woven over the cross machine direction threads shown there.

The set of patterns is repeated for every six cross machine direction yarns and every eighteen machine direction yarns.
One set of weave patterns is one for cross machine direction yarns.
6 to 7 and 7 to 24 for machine direction yarns.

FIG. 2 is a schematic cross-sectional view showing the cross machine direction yarn passages of the double layer woven fabric of the present invention. This figure illustrates six cross machine direction yarns in a set of weave patterns and shows their relative position with respect to the machine direction yarns involved.

The numbers 7, 8, 10, 11, 13, 14,
16, 17, 19, 20, 22, and 23 are double-layer woven fabric 2
8 upper 25 machine direction threads. The numbers 9, 12, 1
5, 18, 21 and 24 are machine direction threads on the underside 26 of the double layer woven fabric 28. The double-layer woven fabric 28 has twice as many machine direction threads as the upper side 25 and the lower side 26.

FIG. 3 shows a double layer woven fabric 28 together with an upper woven fabric 27.
FIG. The upper woven fabric 27 may be any woven fabric that is sewn to the double layer woven fabric 28 by conventional means. A preferred top woven fabric is a single layer woven fabric having long floating and microfiber components (ie, 0.2 mm x 2 plies, or 0.15 mm x 3 plies, etc.).
When the weave pattern of the present invention is used, hysteretic phenomena (hys
teresis) will be increased by 25% or more. Vibration moisture properties are tested by measuring the elasticity module and subjecting the hysteresis to a load tester. The moisture properties are related to the flexibility of the double layer woven fabric 28 or the double layer woven fabric 28 in combination with the upper woven fabric 27.

The second embodiment involves the use of machine direction yarns that have been treated or extruded with an elastic resin or polymer. Preferred materials include machine direction monofilaments or multi / monofilament yarns, which may have been treated with polyurethane, latex, polyacrylic, etc. or extruded. The use of such materials offers further improved properties in hysteresis.

One example of a suitable yarn is a thermoplastic elastomer (TPE). For example, the yarn diameter is 0.020
Inch Hoi Chest Cera's "Riteflex (R
iteflex) ". Thermoplastic polyester elastomers are available with monofilament diameters between 0.004 and 0.060 inches. This material can also be used in multifilament form. Other polyesters that have energy absorbing properties can also be used.

The present invention can be implemented in forms other than the above embodiments. The above examples are for purposes of illustration and are not intended to limit the scope of the invention. That is, the scope of the present invention does not exist in the above embodiments, but is described in the claims. Therefore,
All modifications within the scope of the claims belong to the scope of the present invention.

[0035]

As described in detail above, according to the present invention, it is possible to provide a double-layer woven fabric having an improved vibration absorbing ability and used in a papermaking machine.

The present invention can provide a papermaking felt having excellent stretchability and resilience which ensures even better runnability, less maintenance and maintenance and improved paper quality.

The present invention can also provide a papermaking felt having improved drainage properties.

The present invention provides a papermaking felt having an effective restoring force for a longer period of time in order to impart more excellent wet felt characteristics to a papermaking felt that operates at high speed under a larger load. It has an excellent effect that it can.

[Brief description of drawings]

FIG. 1 is a weave pattern diagram showing a weave pattern of a double-layer woven fabric.

FIG. 2 is a schematic side view showing a passage path of cross machine direction yarns with respect to the machine direction yarns.

FIG. 3 is a schematic side view showing passage paths of cross machine direction yarns with respect to the machine direction yarns of the upper woven fabric and the double layer woven fabric.

[Explanation of symbols]

7 Upper machine direction thread 8 Upper machine direction thread 9 Lower machine direction thread 12 Lower machine direction yarn 28 double layer woven fabric

─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Scott Dee. Quigley United States 39759 Starkville Bellwood Drive, Mississippi 103 (56) References US Patent 4362622 (US, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) D21F 7/08

Claims (4)

(57) [Claims] 1. A double-layer woven fabric for use in a papermaking machine, having a top surface (25) and a bottom surface (26) composed of six harnesses, arranged in order. , 3rd, 4th, 5th and 6th cross machine direction yarns (1-
6) and the 1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th and 12th upper machine direction yarns arranged in order ( 7, 8, 10, 11, 1
3, 14, 16, 17, 17, 19, 20, 22, 23),
The first, second, third, fourth, fifth and sixth lower machine direction yarns (9, 12, 15, 18, 21,
24) comprising a weave pattern with each cross machine direction yarn (1-6), an upper machine direction yarn (7,
8, 10, 11, 13,14,16,17,19,2
0, 22, 23) and lower machine direction yarns (9, 1)
2, 15, 18, 21, 24), and each
In the harness, the upper machine direction yarns (7, 8, 10,
11, 13, 14, 16, 17, 19, 20, 22, 2
Each time 3) is woven, the lower machine direction yarn
(9,12,15,18,21,24) 1 woven
In the first harness, the first, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth and twelfth upper machine direction yarns (7, 10, 11, 13, 14, 16, 17, 1
9, 20, 23) are said first cross machine direction yarns (1)
And woven above the second and eleventh upper machine direction yarns (8, 22) below the first cross machine direction yarn (1) to form a top surface (25), Said first, second, fourth, fifth and sixth lower machine direction yarns (9, 12, 18, 21, 24) are woven underneath said first cross machine direction yarn (1), The third lower machine direction yarn (15) is woven onto the first cross machine direction yarn (1) to form a lower surface (26), and in a second harness, the first and second , Third, fourth, fifth, sixth, seventh, eighth, tenth and eleventh upper machine direction yarns (7, 8, 10, 11, 13, 14, 16, 17,
20 and 22) are woven onto the second cross machine direction yarn (2) and the ninth and twelfth upper machine direction yarns (19, 23) are combined into the second cross machine direction yarn (2).
Woven under to form an upper surface (25), said first, third, fourth, fifth and sixth lower machine direction yarns (9,
15, 18, 21, 24) are woven underneath the second cross machine direction yarn (2), while the second lower machine direction yarn (12) is woven under the second cross machine direction yarn (2). ) To form a lower surface (26), and in the third harness, the first, second, third, fourth, fifth, sixth, eighth, ninth, eleventh, and twelfth harnesses. Twelve upper machine direction yarns (7, 8, 10, 11, 13, 14, 17, 19,
22, 23) are woven onto the third cross machine direction yarn (3) and the seventh and tenth upper machine direction yarns (16, 20) are combined with the third cross machine direction yarn (3). ) Underneath to form an upper surface (25), said second, third, fourth, fifth and sixth lower machine direction yarns (12, 15, 18, 21, 24) being said Woven under a third cross machine direction yarn (3) and said first
A lower machine direction yarn (9) is woven onto the third cross machine direction yarn (3) to form a lower surface (26), and in a fourth harness, the second, third, fifth , 6th, 7th, 8th, 9th, 10th, 11th and 12th upper machine direction yarns (8, 10, 13, 14, 16, 17, 19, 2
0, 22, 23) is the fourth cross machine direction yarn (4)
And woven above the first and fourth upper machine direction yarns (7, 11) below the fourth cross machine direction yarn (4) to form a top surface (25), The first, second, third, fifth and sixth lower machine direction yarns (9, 12, 15, 21, 24) are woven underneath the fourth cross machine direction yarn (4) and , A fourth lower machine direction yarn (18) is woven over the fourth cross machine direction yarn (4) to form a lower surface (26), and in a fifth harness, the first, 2, 4th, 5th, 7th, 8th, 9th, 10th, 11th and 12th upper machine direction yarns (7, 8, 11, 13, 16, 17, 19, 2
0, 22, 23) is the fifth cross machine direction yarn (5)
With woven over, the upper machine direction yarns of the third and sixth (10, 14) is woven under the fifth cross machine direction yarns (5), constitutes the upper surface (25), Said first, second, third, fourth and sixth lower machine direction yarns (9, 12, 15, 18, 24) are woven underneath said fifth cross machine direction yarn (5), The fifth lower machine direction yarn (21) is woven onto the fifth cross machine direction yarn (5) to form a lower surface (26), and in a sixth harness, the first and second , Third, fourth, sixth, seventh, ninth, tenth, eleventh and twelfth upper machine direction yarns (7,8,10,11,14,16,19,2).
0, 22, 23) is the sixth cross machine direction yarn (6)
And the fifth and eighth upper machine direction yarns (13, 17) are woven below the sixth cross machine direction yarn (6) to form a top surface (25). The first, second, third, fourth and fifth lower machine direction yarns (9, 12, 15, 18, 21) are woven underneath the sixth cross machine direction yarn (6) and And a sixth lower machine direction yarn (24) woven on the sixth cross machine direction yarn (6) to form a lower surface (26). Double layer woven fabric used. 2. The double-layer woven fabric for use in a felt for papermaking according to claim 1, wherein a part of the machine direction yarn is a monofilament made of a polymer having a vibration and moisture absorption property. 3. A double-layer woven fabric for use in a felt for papermaking according to claim 2, wherein a part of the machine direction yarn is a monofilament made of a thermoplastic polyester elastomer. 4. A felt for papermaking, wherein an upper woven fabric is sewn to the double-layer woven fabric according to any one of claims 1 to 3.