KR20080014982A - Smoothing press apparatus - Google Patents

Abstract

In order to provide a smoothing press apparatus suitable to be applied to a closed draw type paper machine for allowing the surface of the wet paper to be smoothed and papermaking to be performed in a high speed, [Means for achieving the object] the smoothing press apparatus 100 is mounted on a last stage of the press part 11 of the closed draw type paper machine, and includes a smoothing press 17 having a pair of press rolls 23 and 25, a smoothing belt 27 interposed between the smoothing press 17 together with the wet paper W to smooth the surface of the wet paper, and a wet paper conveyer felt 21 for conveying the wet paper W and passing over it to the smoothing belt 27.

Description

Smoothing Press Device {SMOOTHING PRESS APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoothing press apparatus, and in particular to a smoothing belt suitable for a closed draw type paper machine in which one surface of wet paper is maintained and conveyed by a smoothing belt and the surface of the wetlands is smoothed. It relates to a press device.

Generally, paper machines include wire parts, press parts, and dryer parts. The wire part, the press part, and the dryer part are arranged along the conveying direction in this order. The wetland is sequentially conveyed through a paper conveying tool provided on each of the wire part, the press part, and the dryer part, and the moisture contained in the wetland is squeezed out. Finally, the wetland is dried in a dryer part. The press apparatus provided in the press part includes a plurality of press mechanisms arranged in series along the conveyance direction of the wetland. Each press mechanism comprises a pair of wetland conveying felts having an endless belt shape and a pair of rolls (i.e. roll presses) or rolls and shoes (i.e., arranged up and down so as to sandwich a portion of each of the wetland conveying felts). , Shoe press). The wetland conveyed by the wetland conveying felt driven at about the same direction and speed is pressurized by the pair of rolls or the rolls and the shoe together with the wetland conveying felt and at the same time the moisture contained in the wetland is squeezed out and the Absorbed by wetland conveying felt. There is also another type of paper machine including a smoothing press device disposed at one end of a press device installed in the press part to smooth the surface of the wetland by pressing the wetland conveyed by the smoothing belt together with the smoothing belt. As a paper machine of this type, a roll press type paper machine comprising a press device for pressurizing the wetland while a part of the wetland conveying felt in which the press part maintains the wetland is sandwiched between a pair of rolls, and the press part is the wetland. There is a shoe press type paper machine including a press device for pressurizing the wetland while a portion of the wetland conveying felt is held between the roll and the shoe.

Further, the papermaking machine is a closed draw type papermaking machine in which the wetland is conveyed while both sides of the wetland are always maintained by a conveying felt or a belt, and an open draw type having a gap in which the wetland is conveyed by itself without being retained by the conveying felt. Classified as paper machine. The closed draw type paper machine is capable of papermaking in a high speed manner since the wetland is conveyed while being held in the conveying felt or belt. However, since at least a single surface of the wetland is in contact with the conveying felt or belt, there is a fear that the smoothness of the surface in contact with the conveying felt or belt is reduced. In particular, shoe presses with high water-squeezing properties and high papermaking efficiency have recently been used in such closed draw type paper machines. Improvement of the smoothness of the wetland surface was difficult in this type of paper machine.

In order to improve the smoothness of both sides of the wetland and to produce a large amount of paper, a smoothing press can be placed at the final stage of the press part to improve the surface smoothness of the wetted squeeze. However, most conventional smoothing presses are installed in open draw type paper machines. Therefore, it is difficult to improve the surface smoothness of the wetland while grassing at high speed.

A conventional paper machine in which a smoothing press is installed in a closed draw type paper machine, wherein one surface of the wetland is maintained by the elastic member and simultaneously conveyed, and the wetland is pressed together by the pair of press rolls together with the elastic member to the surface of the wetland. This is smoothed (for example, refer patent document 1).

In addition, there is a paper machine in which a liquid blocking layer is formed on the surface of the wetland conveying felt (see Patent Document 2). This type of wetland conveying felt comprises a fibrous layer having thermoplastic fibers or melted fibers, wherein the thermoplastic fibers or molten fibers are melted by heating the surface of the fibrous layer to form a liquid impermeable layer. do.

(Patent Document 1) International Patent Application Publication Publication WO2004 / 101885

(Patent Document 2) German Utility Model Publication No. DE29706427U1

The papermaking smoothing press disclosed in Patent Literature 1 maintains one surface of the wetland and at the same time is a paper-passing belt or air permeability having no breathability as an elastic member pressurized by a pair of press rolls together with the wetland. Adopt surface improving felt. Rubber belts are exemplified as non-breathable paper-passing belts, and some breathable felts of 10 cc / (sec · cm 2) or less are exemplified as the surface improving felt. However, in recent years there has been an increasing demand for improving the surface smoothness of the wetland while producing paper at high speed. Conventional paper machines are not sufficient to meet such needs, and there is a need for improvement.

In the wetland conveyance felt disclosed by patent document 2, the liquid impermeable layer is formed by heating the surface of the fiber layer containing a thermoplastic fiber or molten fiber, and melting a thermoplastic fiber or molten fiber. The wetland conveying felt has a feature that the thickness of the liquid impermeable layer can be controlled to some extent by adjusting the amount of heat applied from the surface of the fiber layer. However, the wetland conveying felt described in Patent Document 2 tends to be cured and lack flexibility because thermoplastic fibers or molten fibers are included in the base of the wetland conveying felt. Therefore, there is a problem that it is difficult to ensure the durability of the wetland conveying felt or to wet the large volume of wetlands. In addition, the surface in direct contact with the wetland is made of a fibrous layer that does not contain thermoplastic fibers or molten fibers, so that when pressed in the pressurized portion, the fibers are subjected to very high pressure or friction, resulting in the loss or breakage of the surface fibers of the fibrous layer (i.e., , Hair loss) occurs. Hair loss of fibers on the surface of the fiber layer in direct contact with the wetland of the wetland conveying felt degrades the quality of paper products such as printed matter. On the other hand, the surface of the fiber layer is roughened by the hair loss of the fiber, thereby significantly reducing the surface smoothness of the wetland.

This invention is made | formed in view of the subject mentioned above, The objective is to provide the smoothing press apparatus suitable for the closed draw type paper machine which makes the surface of a wetland smooth, and enables the papermaking at high speed.

In order to achieve the above object, the smoothing press device according to the present invention is the following (1), (2), (3), (4), (5), (6), (7), (8) , (9) and (10).

(1) a first press roll having a smooth surface; A second press roll having a smooth surface and facing the first press roll; A smoothing belt sandwiched between the first press roll and the second press roll with the wetland to smooth the wetland surface; A smoothing press device having a wetland conveying felt for conveying the wetland and handing it over to the smoothing belt, the smoothing press device provided in a press device provided in a press part of a closed draw type paper machine,

The wetland conveying felt, comprising at least splittable fibers and having a wetland contact fiber layer in direct contact with the wetland,

The smoothing belt is provided with a smoothing press device comprising a base body and a polyurethane layer in direct contact with the wetland.

(2) The smoothing apparatus described in (1), wherein the polyurethane contained in the polyurethane layer of the smoothing belt contains a non-reactive polydimethylsiloxane liquid, and furthermore, according to JIS A hardness standard. It has a hardness of ° to 98 °.

(3) The smoothing press device according to (1), wherein the polyurethane contained in the polyurethane layer of the smoothing belt has a hardness of 90 ° to 95 ° in the JIS A hardness standard, and a non-reactive polydimethylsil It is a mixture of a polyurethane containing an oxane liquid substance and a polyurethane having a hardness of 95 ° to 98 ° in the JIS A hardness standard and containing no non-reactive polydimethylsiloxane liquid.

(4) The smoothing press device according to (1), wherein the polyurethane contained in the polyurethane layer of the smoothing belt is 0.5 to 25 with respect to the total amount of the urethane polymer, the curing agent, and the urethane polymer and the curing agent. It is formed by curing a mixture with wt% of non-reactive polydimethylsiloxane liquid.

(5) The smoothing press device according to (4), wherein the curing agent is dimethylthiotoluenediamine or methylene-bisorthochloroaniline.

(6) The smoothing press device according to any one of (1) to (5), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on a surface of a wet side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer to include split fibers and to make direct contact with the wetland.

(7) The smoothing press device according to any one of (1) to (5), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wet side of the base body and a second batt layer formed on the surface of the roll side of the base body; A wetland contact comprising a plurality of split fibers divided into filaments and a polymeric elastic material impregnated between the filaments, the wetland contact formed on the surface of the wet side of the first batt layer such that the filaments and polymeric elastic material are in direct contact with the wetland A fibrous layer; And a hydrophilic non-woven layer disposed between the first batt layer and the wetland contact fiber layer.

(8) The smoothing press device according to (7), wherein the wetland contact fiber layer contains 1 to 10 wt% of the polymer elastic material.

(9) The smoothing press device according to any one of (6) to (8), wherein the fibers contained in the wetland contact fiber layer are composed of 15 to 100 wt% of divided fibers and the remaining portions are undivided fibers. .

(10) The smoothing press device according to any one of (6) to (9), wherein the divided fibers have a fineness of fiber of 3.3 dtex or less before division.

According to the smoothing press apparatus of the said (1) structure, a wetland is conveyed by an impermeable wetland conveying felt which has a wetland contact fiber layer which directly contacts a wetland containing split fiber, and consists of a base body and a polyurethane layer. It was passed on to the permeable smoothing belt and the wetland was sandwiched between the pair of press rolls with the smoothing belt to smooth the wetland surface. When the wetland is sandwiched between the wetland conveying felt and the smoothing belt and a nip pressure is applied, the wetland to be conveyed generally has a property of adhering to the smooth side of the surface and the high hardness side. Therefore, the wetland conveyed by the wetland conveying felt is reliably handed over to the smoothing belt which is high in hardness, and whose surface is smooth. In addition, the wetland can be pressed together with the smoothing belt by a pair of press rolls to smooth the surface in contact with the smooth surface of the smoothing belt.

According to the smoothing press apparatus of the said (2)-(5) structure, since the polyurethane contained in the said smoothing belt consists of the material containing a specific element, it is crack resistance and wear resistance. , Bending fatigue resistance, permanent distortion resistance, etc. may be excellent. Thus, the smoothing belt can be used in harsh environments such as long term high pressure press parts and high speed papermaking. In particular, the wear resistance of the smoothing belt surface is significantly improved, and cracking hardly occurs. Wetlands that are pressed in contact with a smoothing belt having such a smooth surface may have a smooth surface.

According to the smoothing press apparatus of the said (6)-(10) structure, a wetland conveyance felt is made on the surface of the base body, the 1st bat layer formed on the surface of the wetland side of the base body, and the roll side of the base body. And a second batt layer formed and a wetland contact fiber layer formed on the surface of the wet side of the first batt layer comprising at least split fibers. The wetland contact fiber layer comprises split fibers that can be split into filaments with extremely low fineness. Therefore, the surface smoothness of the wetland can be improved. Further, such a wetland conveying felt may be suitably used in combination with a smoothing belt consisting of a base body and a polyurethane layer, the surface of which is formed more smoothly than the wetland contact fiber layer.

In addition, the wetland contacting fiber layer of the wetland conveying felt comprises a plurality of split fibers divided into filaments and 1 to 10 wt% of polymer elastic material impregnated between the filaments, wherein the wetland conveying felt comprises a first batt layer and a wetland It has a hydrophilic nonwoven layer arrange | positioned with a contact fiber layer. Therefore, it has a suitable water permeability and compression recovery property (i.e. cushion property), and even when the surface is smooth, the separation of paper is good and the wetland can be conveyed reliably. In particular, in the wetland conveying felt, since the hydrophilic nonwoven fabric layer disposed between the first batt layer and the wetland contacting fiber layer has a function of preventing re-wetting into the wetland, when the wetland is turned over to the smoothing belt, the wetland Do not reinvent it.

Furthermore, in order to obtain a wetland having a smooth surface, it is preferable that the fibers contained in the wetland contact fiber layer are composed of 15 to 100 wt% of split fibers and the remaining portions are undivided fibers, and further, the fineness before splitting the split fibers. Is preferably 3.3 dtex or less.

Moreover, the smoothing press apparatus which concerns on this invention is characterized by the following (11), (12), (13), (14), (15), and (16).

(11) a first press roll having a smooth surface; A second press roll having a smooth surface and facing the first press roll; A closed draw type paper machine having a smoothing belt sandwiched between the first press roll and the second press roll together with the wetland to smooth the wetland surface, and a wetland conveying felt for conveying the wetland and handing it over to the smoothing belt. There is provided a smoothing press device mounted to a press device installed on a press part. The wetland conveying felt comprises a three-dimensional arrangement comprising a base body, a batt layer, two stitch grounds and a portion of a connecting yarn connecting the two stitch grounds diagonally. Includes knitwear; The smoothing belt includes a wetland contacting fiber layer in direct contact with the wetland, including at least split fibers.

(12) The smoothing press device according to (11), wherein the smoothing belt comprises: a base body; A first batt layer formed on a surface of the wet side of the base body; A second batt layer formed on the surface of the roll side of the base body; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer to include direct split fiber and in direct contact with the wetland.

(13) The smoothing press device according to (11), wherein the smoothing belt comprises: a base body; A first batt layer formed on a surface of the wet side of the base body; A second batt layer formed on the surface of the roll side of the base body; A plurality of split fibers divided into filaments and a polymeric elastic material impregnated between the filaments. The wetland contact fiber layer comprises a wetland contact fiber layer formed on a surface of the wet side of the first bat layer such that the filament and the polymeric elastic material are in direct contact with the wetland; And a hydrophilic nonwoven layer disposed between the first batt layer and the wetland contact fiber layer.

(14) The smoothing press device according to (13), wherein the wetland contact fiber layer contains 1 to 10 wt% of the polymer elastic material.

(15) The smoothing press device according to any one of (11) to (14), wherein the fibers contained in the wetland contact fiber layer are composed of 15 to 100 wt% of split fibers and the remaining portions are undivided fibers. .

(16) The smoothing press device according to any one of (11) to (14), wherein the fineness before the division of each of the divided fibers is 3.3 dtex or less.

According to the smoothing press apparatus of the structure of said (11), it has a three-dimensional knit fabric containing a base, the bat layer, and the connection thread which connects two stitch grounds and two stitch grounds, and the one part crosses and connects diagonally. The wetland is conveyed by a permeable wetland conveying felt and is passed to an impermeable smoothing belt having at least a wetland contact fiber layer in direct contact with the wetland comprising split fibers, and the wetland with the smoothing belt between the pair of press rolls. To smooth the wetland surface. Thus, the wetland contact fiber layer comprises split fibers that can be split into filaments with extremely low fineness. As a result, the surface smoothness of the wetland in contact with the wetland connecting fiber layer is improved, and a wetland with high smoothness is obtained.

Further, according to the smoothing press apparatus of the above-mentioned (12) to (16), since the wetland contact fiber layer contains 1 to 10 wt% of a polymer elastic material impregnated between a plurality of divided fibers and filaments divided into filaments The filament is bonded to some extent by the polymer elastic material. As a result, so-called hair loss phenomenon is unlikely to occur, and the fall of the filament from the smoothing belt is prevented, so that a wetland with a very smooth surface can be obtained. In addition, because of the proper recovery, it is possible to form a large volume of wetland.

In addition, since the fiber contained in the wetland contact fiber layer is 15 to 100 wt% of divided fibers, and the remaining portion is composed of undivided fibers, the characteristics of the smoothing belt are changed by appropriately changing the blend ratio between the divided fibers and the undivided fibers. Can be selected. Furthermore, in order to obtain a wetland having a smooth surface, it is preferable that the fineness before each division of the divided fibers is 3.3 dtex or less.

Moreover, the smoothing press apparatus which concerns on this invention is characterized by the following (17), (18), (19), (20), (21), (22), and (23).

(17) a first press roll having a smooth surface; A second press roll having a smooth surface and disposed opposite the first press roll; A closed draw type paper machine having a smoothing belt sandwiched between the first press roll and the second press roll together with the wetland to smooth the wetland surface, and a wetland conveying felt for conveying the wetland and handing it over to the smoothing belt. A smoothing press device mounted on a press device installed in a press part of the press, wherein the wetland conveying felt has a wetland contact fiber layer including at least molten fiber and in direct contact with the wetland, wherein the smoothing belt includes a base body and the wetland. It consists of a polyurethane layer in direct contact with.

(18) The smoothing press device according to (17), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer to include molten fiber and to be in direct contact with the wetland.

(19) The smoothing press device according to (17), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wetland side of the base body and comprising the molten fiber; A second batt layer formed on a surface of the roll side of the base body and comprising the molten fiber; And a wetland contact fiber layer formed on the surface of the wetland side of the first batt layer in direct contact with the wetland.

(20) The smoothing press device according to (17), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body and comprising the molten fiber; And a wetland contact fiber layer formed on the surface of the wetland side of the first batt layer in direct contact with the wetland.

(21) The smoothing press device according to (17), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wetland side of the base body and comprising the molten fiber; A second batt layer formed on a surface of the roll side of the base body and comprising the molten fiber; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer to include molten fiber and to be in direct contact with the wetland.

(22) The smoothing press device according to any one of (17), (18) and (21), wherein the wetland conveying felt comprises: a base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer such that the molten fiber is melted by thermal processing and the molten fiber is in direct contact with the wetland.

(23) The smoothing press device according to any one of (17) to (22), wherein the fibers forming the first batt layer, the second batt layer, and the wetland contact fiber layer containing the molten fiber include: The molten fiber is made of 15 to 100 wt%, the remainder is made of non-melt fibers.

According to the smoothing press apparatus of the structure of said (17), a wetland is conveyed by the non-permeable wetland conveying felt which contains a molten fiber and has a wetland contact fiber layer in direct contact with a wetland, and consists of a base body and a polyurethane layer. It is passed on to an impermeable smoothing belt, and the wetland is sandwiched between the pair of press rolls with the smoothing belt to smooth the wetland surface. The molten fibers are melted by heating to bond with each other, the air permeability of the wetland conveying felt decreases, and the surface thereof is smoothed. Thus, by adjusting the heating method, a wetland conveying felt having water permeability and compression recovery (cushionability) and having a smooth surface can be obtained. In addition, the wet surface can be smoothed while effectively preventing the rehumidity phenomenon. Moreover, since the paper separation is good even when the surface is smooth, it is possible to reliably hand over the wetland to the smoothing belt.

According to the smoothing press apparatus of the structure of said (18)-(23), melt fiber is contained in arbitrary single layers or multiple layers of the 1st bat layer, the 2nd mat layer, and the wetland contact fiber layer which comprise a wetland conveying felt. To form wetland conveying felt. Thereby, the micro-transmissive layer can be formed into any layer. In addition, wetland conveying felts having water permeability and surface smoothness suitable for the properties of wetland wetlands can be easily obtained. Moreover, the wetland having a good paper separation property and a smooth surface can be produced efficiently.

In addition, when the entire wetland contact fiber layer is melted, it does not exhibit proper water permeability. Thus, the wetland contact fiber layer is partially melted by the partially melted fiber by heat treatment remaining without melting the non-melt fiber and some molten fibers. Melted fibers. Thus, a wetland conveying felt having appropriate water permeability and surface smoothness is obtained, and even if the surface is smooth, paper separation is good, and it is possible to reliably hand over the wetland to the smoothing belt.

In addition, since the fibers contained in the first batt layer, the second batt layer, and the wetland contact fiber layer containing the molten fibers are 15 to 100 wt% of the molten fibers, and the remaining portion is composed of the non-melt fibers, the molten fibers and the non-melt fibers By suitably changing the blend ratio with the fibers, the properties of the wetland conveying felt can be selected. Such wetland conveying felt is suitable for use in combination with a smoothing belt consisting of a base body and a polyurethane layer, the surface of which is formed more smoothly than the wetland contact fiber layer.

(Effects of the Invention)

According to the smoothing press apparatus of the present invention, there is provided a micro-permeable wetland conveying felt having a wetland contact fiber layer in direct contact with a wetland including split fibers, and an impermeable smoothing belt comprising a base body and a polyurethane layer; Permeable wetland conveying felt having a base body, a batt layer, and a three-dimensional woven layer comprising an arrangement in which a portion of a connecting thread connecting two stitch grounds and two stitch grounds is diagonally cross-connected. And in combination with a micro-permeable smoothing belt comprising at least a split fiber and having a wetland contact fiber layer in direct contact with the wetland or any single or multiple layers of the first batt layer, the second batt layer and the wetland contact fiber layer. A combination of a wetland conveying felt comprising molten fibers and an impermeable smoothing belt consisting of a base body and a polyurethane layer is provided. In this case, the wetland is conveyed by the wetland conveying felt and transferred to the smoothing belt, and the wetland is pressed together with the smoothing belt by a pair of press rolls to smooth the wetland surface. Therefore, the wetland can be reliably passed from the wetland conveying felt to the smoothing belt, and the wetland with high surface smoothness can be grassed at high speed.

The present invention has been described briefly above. Further, by reading the best mode for carrying out the invention described below with reference to the accompanying drawings, the details of the present invention will become more apparent.

1 is a schematic configuration diagram of a closed draw type paper machine provided with a smoothing press device as a first embodiment of the present invention.

2 is a longitudinal cross-sectional view of the smoothing belt.

3 is a longitudinal sectional view of the wetland conveying felt.

4 is an enlarged longitudinal cross-sectional view of split fibers forming a wetland contact fiber layer.

5 is a longitudinal sectional view of another wetland conveying felt.

Fig. 6 is a schematic configuration diagram of a closed draw type paper machine provided with the smoothing press device of the second embodiment of the present invention.

7A-7D show longitudinal cross-sectional views of a wetland conveying felt in which a three-dimensional knit fabric is disposed, each of which is a longitudinal cross-sectional view of an embodiment in which the arrangement of the three-dimensional knit fabric is changed.

FIG. 8 is an enlarged view showing a three-dimensional knitted fabric, FIG. 8A is a perspective view of the three-dimensional knitted fabric, FIG. 8B is a side view of arrow B in FIG. 8A, and FIG. 8C is a side view of arrow C in FIG. 8A.

9 is a side view of a three-dimensional knit fabric.

10 is a plan view of the stitch ground of a three-dimensional knitted fabric.

11 is a plan view of a stitch ground of a three-dimensional knitted fabric.

12A to 12D show longitudinal cross-sectional views of the wetland conveying felt of the third embodiment of the present invention, and are longitudinal cross-sectional views of each embodiment in which the arrangement of the fibrous layer containing molten fibers is changed.

13 is an enlarged cross-sectional view of a molten fiber.

It is a schematic explanatory drawing of the heat processing apparatus of the wetland conveyance felt containing molten fiber.

* Short description of drawing symbols *

100 smoothing press device

200 smoothing press device

11 press parts

17 smoothing press

21 Marsh Bounce Felt

23 first press roll

25 second press roll

27 smoothing belt

31 Base Body

33 polyurethane layer

41 Base Body

43 bat floor

43A first batt layer

43B Second Bat Layer

45 wetland contact fiber layer

45A split fiber

53 Hydrophilic Nonwoven Layer

55 polymer elastic materials

121 Marsh Bounce Felt

127 smoothing belt

141 base body

143 bat floor

151 3D Knitwear

153st Stitch Ground

155 2nd Stitch Ground

157 connecting thread

221 wetland bounce felt

241 base body

243A First Bat Layer

243B Second Bat Layer

245 wetland contact fiber layer

249 molten fiber

255 heat press roll (heat treatment unit)

W Marsh

EMBODIMENT OF THE INVENTION Hereinafter, the preferred embodiment which concerns on this invention is described in detail based on drawing.

(First embodiment)

1 is a schematic configuration diagram of a closed draw type paper machine equipped with a smoothing press device according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a smoothing belt, FIG. 3 is a longitudinal sectional view of a wetland conveying felt, and FIG. 4 is a wet contact fiber layer. Is an enlarged longitudinal cross-sectional view of the divided fiber forming the cross section, and FIG.

As shown in FIG. 1, in the closed draw type paper machine, the press part 11 and the dryer part 13 are arrange | positioned in series in the conveyance direction of the wetland W in that order. The smoothing press 17 constituting the smoothing press device 100 is a press of the final stage of the press part 11 on the downstream side of the final water-squeezing press rolls 15A and 15B of the press part 11. It is arranged. The water squeezing press rolls 15A and 15B are disposed to face each other with the conveyance path of the wetland W interposed therebetween. The water-squeezing press rolls 15A and 15B pressurize the conveying felt 19 and the wetland conveying felt 21 together with the wetland W to convey the wetland W therebetween, thereby adsorbing moisture in the wetland W. Squeeze out.

The smoothing press 17 smoothes the surface of the wetland where water was squeezed out, and conveys it to the dryer part 13. The said smoothing press 17 has the 1st press roll 23 and the 2nd press roll 25 arrange | positioned so that they may mutually face each other with the conveyance path | route of the wetland W in between. The first press roll 23 and the second press roll 25 have a smooth surface with high surface hardness. The 1st press roll 23 and the 2nd press roll 25 pressurize the smoothing belt 27 which runs while maintaining the one surface of the wetland W with the wetland W, and smooths the surface (both surfaces) of a wetland. do.

A pair of transfer rolls 29A and 29B are disposed between the water-squeezing press rolls 15A and 15B and the smoothing press 17. The wetland W is pressurized in a state sandwiched between the wetland conveying felt 21 and the smoothing belt 27 to generate a nip pressure, thereby smoothing the wetland W conveyed by the wetland conveying felt 21 to the smoothing belt 27. It is intended to be transported by

Next, the smoothing belt 27 used in the smoothing press apparatus 100 of this embodiment is demonstrated in detail. As shown in FIG. 2, the smoothing belt 27 is formed by laminating a polyurethane layer 33 on both sides of the base body 31. The base body 31 is, for example, a film or knitted fabric made of polyamide, polyester, aromatic polyamide, aromatic polyimide, high strength polyethylene, or the like, spiral wound around a narrow width band, or the like. In addition, the base body 31 is, for example, the seal material 35 in the machine direction (ie, the wetland driving direction) in the MD (Machine Direction) direction and the seal material 37 in the cross machine direction (ie, the width direction) in the CMD direction. In addition to the woven fabric of), both the yarn materials 35 and 37 without being woven and superimposed, a film or a knitted fabric, a spiral wound of a narrow band, and the like can be used.

As a polyurethane which forms the polyurethane layer 33, what contains a non-reactive polydimethylsiloxane liquid substance and is 90 degrees-98 degrees by JIS A hardness (henceforth "hardness") can be used. Otherwise, a mixture of a polyurethane containing no non-reactive polydimethylsiloxane liquid with a hardness of 90 ° to 95 ° and a polyurethane containing a non-reactive polymethylsiloxane liquid with a hardness of 95 ° to 98 ° It may be. Moreover, what hardened | cured the mixture of a urethane polymer, a hardening | curing agent, and a non-reactive polydimethylsiloxane liquid substance may be sufficient.

The smoothing belt 27 of such a structure grinds the surface after hardening of the polyurethane layer 33, makes it the predetermined thickness, and makes the surface a smooth surface. In addition, the smoothing belt 27 having such a configuration has many advantages such as crack resistance, abrasion resistance, bending fatigue resistance, and permanent distortion resistance. In particular, since it is excellent in crack resistance, which is an important characteristic in achieving smoothing of the wetland surface in contact with the wetland W, it can be used for a long period of time even in a harsh environment such as a high paper speed and a high pressure of the press part.

Next, the wetland conveying felt 21 is demonstrated. As shown in FIG. 3, the wetland conveying felt 21 used in the smoothing press apparatus 100 of this embodiment includes a base body 41, a bat layer 43 (first bat layer 43A, and a first batt). 2 batt layer 43B) and a wetland contact fiber layer 45. More specifically, the first batt layer 43A is formed on the wetted side surface of the base body 41, and the second batt layer 43B is formed on the roll side or shoe side surface of the base body 41. Is formed, and the wetland contact fiber layer 45 is formed on the wetland side surface of the first batt layer 43A so as to be in direct contact with the wetland. The wetland contact fiber layer 45 and the batt layer 43 are aggregates of staple fibers. The bat layer 43 is formed by first stacking staple fibers on the base body 41 by a carding device (not shown), and in the same form on the bat layer 43, the wetland contact fiber layer 45 ). The base body 41, the wetland contact fiber layer 45, and the batt layer 43 are needle punched to interlock. In this manner, the base body 41, the bat layer 43 (the first bat layer 43A and the second bat layer 43B), and the wetland contact fiber layer 45 are interlocked by needle punching.

The base body 41 is for imparting strength to the wetland conveying felt 21, for example, synthetic fibers such as nylon 6, nylon 66, wool, etc., which are excellent in wear resistance, fatigue resistance, elongation characteristics, and contamination resistance. A woven fabric made of a natural fiber or the like and one superimposed without being squeezed, a film, or the like can be suitably used. In this embodiment, the base body 41 is woven.

The bat layer 43 (the first bat layer 43A and the second bat layer 43B) is an undivided fibrous layer formed by staple fibers 47 having a fineness of 6 dtex or more (typically, about 17 dtex). to be. As the material for forming the batt layer 43, a material having the same form as that of the base body 41 is appropriately used. In addition, the second batt layer 43B may be omitted from the wetland conveying felt 21.

The wetland contact fiber layer 43 is made up of split fibers 45A. That is, the split fibers 45A make up 100 wt% of the wetland contact fiber layer 45. Each of the split fibers 45A forming the wetland contact fiber layer 45 has a plurality of filaments (petal parts to be described later) during the manufacturing process of the wetland conveying felt 21, as shown in FIG. (49) and a stem part (51), the composite fiber having a structure divided into, it is preferable that the fineness is 3.3 dtex or less, in this embodiment, the fineness is 1.9 dtex, and the cross section of 51 mm in length Fiber is used. The split fibers 45A are, for example, a six-sided fan-shaped plate portion 49 and a portion of the plate portion 49 adjacent to each other, but having a cross section which joins side surfaces thereof, and has a substantially asterisk-shaped stem portion. It consists of seven parts which are 51, and these parts are integrated in a circular cross section, and it is formed so that it is dividable.

The split fiber 45A is formed of, for example, nylon 6 (ie, N6), and the stem 51 is formed of, for example, poly (butylene terephthalate) (ie, PBT). As a specific example of such split fiber 45A, the brand name "PA31": Toray Industry Inc. Products; The fineness of the divided fibers 45A is 3.3 dtex or less mainly for facilitating the formation of the wetland contact fiber layer 45, and specifically, a carding process that is a manufacturing process of the wetland conveying felt 21 itself. In order to effectively divide the wetland conveying felt 21 by heat treatment or press working in a needling process and / or a finishing process.

In addition, the wetland contact fiber layer 45 may contain 15 wt%-100 wt% of split fibers 45A, and the remaining portions may be mixed with undivided fibers. Undivided fiber is a normal short fiber which is not divided | segmented even in a carding process or a needling process, and also by the press by a press apparatus. As the undivided fiber, for example, a staple fiber having a fineness of 1.9 dtex (that is, the same value as the fineness before dividing the divided fiber) to 6 dtex is preferable.

The wetland conveying felt 21 is composed of a hydrophilic nonwoven layer 53 disposed longitudinally in the first batt layer 43A between the base body 41 and the wetland contact fiber layer 45, as shown in FIG. It may further comprise a polymeric elastic material 55 impregnated in the wetland contact fiber layer 45. The hydrophilic nonwoven layer 53 is thinner than the fibers forming the bat layer 43, and is formed of a hydrophilic nonwoven fabric having a high density by, for example, laminating undivided fibers having a fineness of 4 dtex or less. As an example of the hydrophilic nonwoven fabric which forms the hydrophilic nonwoven fabric 53, spun-bond formed by laminating continuous filaments, for example, by laminating fibers formed by melting a resin such as nylon and further spinning. ) Nonwoven fabric, a nonwoven fabric obtained by fusing a molten polymer by hot air to form a filament, and the like.

The polymer elastic material 55 is impregnated from the wetland surface side of the wetland contact fiber layer 45 between the filaments formed by the division of the plurality of divided fibers 45A. Specifically, the wetland contact fiber layer 45 includes 1 wt% to 10 wt% of the polymeric elastic material 55. The polymer elastic material 55 is obtained by dividing a plurality of divided fibers 45A into filaments by thermal processing or press working in a carding process, a needling process, and / or a finishing process, which is a manufacturing process of the wetland conveying felt 21. Then, at room temperature, synthetic resins such as aqueous urethane resins, aqueous acrylic resins, aqueous epoxy resins, and aqueous synthetic rubbers (ie, aqueous emulsion resins) are applied with a roll or sprayed to impregnate between the filaments, and then heated and cured. . At this time, since the hydrophilic nonwoven fabric layer 53 is disposed in the lower layer of the wetland contact fiber layer 45 (that is, the wetland side surface of the first batt layer 43A), the polymer elastic material 55 is a hydrophilic nonwoven fabric layer. Further impregnation is prevented by the 53, so that the first batt layer 43A, the second batt layer 43B, and the base body 41 are not impregnated.

The operation of this embodiment will be described. As shown in FIG. 1, the wetland W conveyed from the upstream side of the final water squeegee press rolls 15A and 15B is sucked by the suction roll 61, and one surface thereof is conveyed felt. After being held at 19, it is sandwiched between the conveying felt 19 and the wetland conveying felt 21 and supplied between the water-squeezing press rolls 15A and 15B to squeeze out moisture. The wetland W finally squeezed out of water is sucked by the suction roll 63 and maintained on one surface by the wetland conveying felt 21 and then conveyed by the wetland conveying felt 21 and the smoothing belt 27. It is pressurized by a pair of transfer rolls 29A and 29B in a supported state. Thereby, the wetland W transfers from the wetland conveyance felt 21 to the smoothing belt 27. That is, the wetland W has the characteristic of attaching to a smoother surface or to a higher hardness when the nip pressure is applied while being held by two conveying felts or conveying belts. Therefore, it is reliably transferred to the smoothing belt 27 having the surface of the polyurethane layer 33 which is higher in hardness and smoother than the surface of the wetland contact fiber layer 45 including the filament.

The wetland W is supplied to the smoothing press 17 with its one surface held by the smoothing belt 27, and together with the smoothing belt 27, the first press roll 23 and the second press roll 25. By pressurizing to both surfaces of the wetland W is smoothed. In detail, one surface of the wetland W is in contact with the smooth surface of the polyurethane layer 33 of the smoothing belt 27, and the other surface has a high surface hardness and has a smooth surface of the second surface. The wetland W is obtained in contact with the press roll 25 and smoothed so that the surface roughness of both sides is greatly reduced. Moreover, the surface of the side which contacts the 2nd press roll 25 of the wetland W contains the filament from which the split fiber 45A was divided from when passing through the water-squeeze press rolls 15A and 15B. Further, the wetland conveying felt 21 is conveyed by the wetland conveying felt 21 while the surface is in contact with the smooth wetland contact fiber layer 45, and smoothed to some extent. Therefore, the 2nd press roll 25 is smoothed easily and efficiently. The wetland W is conveyed to the dryer part 13 while being sandwiched between the canvas 65 and the dryer 67, and is dried by the dryer 67.

According to the smoothing press apparatus 100 of this embodiment, the wetland conveyance felt 21 in which the wetland contact fiber layer 45 containing the split fiber 45A was formed, and the smoothing belt which has the surface of polyurethane By applying the nip pressure between 27), the wetland W to be conveyed is reliably handed over to the smoothing belt 27 having a high hardness and a smooth surface. Further, the wetland W is pressurized by the pair of press rolls 23 and 25 together with the smoothing belt 27 of the smooth surface, whereby the wetland W contacts the smoothing belt 27 and the press roll 25. Smoothing of both surfaces of (W) can be achieved.

In addition, since the polyurethane included in the smoothing belt 27 is made of a material containing a specific element, it is excellent in characteristics such as crack resistance, wear resistance, flex fatigue resistance, and permanent distortion resistance, and the speed of papermaking speed is increased. It can be used for a long time even in the harsh use environment, such as the pressurization of the press part 11. In particular, the wear resistance of the surface of the smoothing belt 27 is remarkably improved, so that there is almost no cracking. The wetland W which comes into contact with the smoothing belt 27 which has such a smooth surface, and is pressurized becomes a surface whose surface is smooth.

Furthermore, the wetland conveying felt 21 is formed on the surface of the base body 41, the first bat layer 43A formed on the wetland side surface of the base body 41, and the roll side of the base body 41. And a second batt layer 43B formed on the wetland contact fiber layer 45 formed on the surface of the wetland side of the first batt layer 43A including at least the split fibers 45A. The wetland contact fiber layer 45 includes split fibers 45A that are split into filaments with very low fineness. Therefore, the surface smoothness of the wetland W can be improved.

Further, the wetland contact fiber layer 45 of the wetland conveying felt 21 is formed of a plurality of split fibers 45A divided into filaments and 1 wt% to 10 wt% of the polymer elastic material 55 impregnated between the filaments. Include. The wetland conveying felt 21 has a hydrophilic nonwoven layer 53 disposed between the first batt layer 43A and the wetland contact fiber layer 45. Such constructions have adequate water permeability, compression recovery (cushionability) and paper separation. Therefore, it is possible to reliably hand over the wetland W to the smoothing belt 27. In particular, in the wetland conveying felt 21, since the hydrophilic nonwoven fabric layer 53 disposed between the first batt layer 43A and the wetland contact fiber layer 45 has a function of preventing moisture in the wetland W, it is smoothed. When the wetland W is handed over to the belt 27, the wetland W is not re-moistened.

(Second embodiment)

Next, a second embodiment of the smoothing press apparatus will be described with reference to FIGS. 6 to 11.

FIG. 6 is a schematic configuration diagram of a closed draw type paper machine provided with a smoothing press device of a second embodiment of the present invention, and FIG. 7 shows a longitudinal cross-sectional view of a wetland conveying felt in which a three-dimensional knitted fabric is disposed, and FIGS. 7A to 7D. Is a longitudinal sectional view of each embodiment in which the arrangement of the three-dimensional knitted fabric is changed, FIG. 8 is an enlarged view showing the three-dimensional knitted fabric, FIG. 8A is a perspective view of the three-dimensional knitted fabric, FIG. 8B is a side view of arrow B in FIG. It is a side view of the arrow C in FIG. 8A, FIG. 9 is a side view of a three-dimensional knit fabric, FIG. 10 is a top view of the stitch ground of a three-dimensional knit fabric, and FIG. 11 is a top view of the stitch ground of a three-dimensional knit fabric.

As shown in Fig. 6, the smoothing press device 200 of the second embodiment is configured in the same form as the smoothing press device 100 of the first embodiment, and instead of one phase transfer rolls 29A and 29B, The roller 123 is provided and the materials of the wetland conveying felt 121 and the smoothing belt 127 differ. The other parts are the same as those of the smoothing press apparatus 100 of the first embodiment of the present invention. Therefore, the same parts or the corresponding codes are given to the same parts to simplify the description or omit them.

The wetland conveying felt 121 has a base body 141, a bat layer 143, and a three-dimensional knitted layer 151, as shown in FIG. 7. The base body 141 is for generating the strength of the wetland conveying felt 121, and is obtained by weaving a woven fabric obtained by squeezing the MD directional yarn material and the CMD directional yarn material, or without overlapping the MD directional yarn material and the CMD directional yarn material. Various configurations can be taken, such as a configuration and a configuration obtained by winding a fabric having an end portion.

The bat layer 143 is an aggregate of staple fibers. The staple fiber is laminated on the base body 141 or the three-dimensional knitted layer 151, and the staple fiber is laminated on the base body 141 by a carding device (not shown) to form the bat layer 143. Needle punched to form and interlock. Otherwise, the nonwoven fabric layer which interlocked only the aggregate of staple fibers by needle punching is mounted on the base body 141 or the three-dimensional knit layer 151, and the nonwoven fabric and the base body 141 or the nonwoven fabric and the three-dimensional knit fabric are mounted. It is also possible to interlock by needle punching the layer 151.

The arrangement of the base body 141, the bat layer 143, and the three-dimensional knitted layer 151 may appropriately select various configurations, as shown in FIGS. 7A to 7D. In the wetland conveying felt 121 shown in FIG. 7A, the base body 141 and the three-dimensional knitted layer 151 are disposed in contact with each other. The wetland conveying felt 121 shown in FIG. 7B includes the base body 141. And the bat layer 143 is inserted between the three-dimensional knitted layer 151. On both sides of the wetland conveying felt 121 shown in FIG. 7A and FIG. 7B, the wetland contact fiber layer 145 is provided on the three-dimensional knitted layer 151 side. In addition, the wetland conveying felt 121 shown to FIG. 7C, 7D reversed the arrangement | positioning of the base body 141 and the three-dimensional knitted layer 151, The wetland contact fiber layer 145 has the base body 141 It is formed on the side.

In the three-dimensional knitted layer 151, as shown in FIG. 8, a part of the connecting thread 157 connecting two stitch grounds 153 and 155 and two stitch grounds 153 and 155 crosses diagonally. The configuration includes an array to be connected. In other words, in the three-dimensional knitted layer 151, the connecting thread 157 is connected between the first stitch ground 153 and the second stitch ground 155. Here, the first stitch ground 153 and the second stitch ground 155 constituting the three-dimensional knitted layer 151 are each a stitch line (that is, a well) and a side surface of the cloth in the longitudinal direction of the fabric, respectively. It is connected by directional stitch lines (coarse).

The connecting thread 157 includes a connecting thread 157A connecting the front and back stitches facing each other of the two stitch grounds 153 and 155, and a well or cores separated from the facing stitches of the front and back stitch grounds. It consists of connecting thread 157B (that is, cross connecting thread) connected diagonally between the lines. 8, the first stitch ground 153 is illustrated as a continuous black circle, and the second stitch ground 155 is illustrated as a continuous white circle.

The structure 151 of the three-dimensional knitted fabric is, for example, a part of the connecting thread 157 is arranged cross-connected between the first stitch ground 153 and the second stitch ground 155, for example, Japanese Patent Laid-Open No. S61- The well-known structure described in 31241, H02-74648, H02-229247, 2001-234456 can be employ | adopted. That is, as the first or second stitch grounds 153 and 155, a hexagonal mesh shown in FIG. 10, a rhombus mesh shown in FIG. 11, and the like can be appropriately selected. Moreover, the arrangement | positioning of the connection thread which cross-connects etc. can also be selected suitably, As shown in FIG. 9, the structure which includes only the connection chamber 157 which cross-connects can be provided.

By installing the three-dimensional knitted layer 151 having such a configuration in the wetland conveying felt 121, it is possible to improve the compression recovery and thickness retention. The reason is that the connecting thread 157 having the three-dimensional knitted layer 151 cross-connected in the thickness direction is arranged to support the first and second stitch grounds 153 and 155. Therefore, even when the three-dimensional knitted layer 151 is compressed by the load, after the load is removed, the connecting chamber 157 returns to the original shape in the thickness direction. As a result, compression recovery and thickness retention can be increased.

In particular, when a part of the connecting thread 157 is arranged by cross-connecting between the first and second stitch grounds 153 and 155, compression recovery is compared with a case in which the connecting thread 157 is not arranged by cross-connecting. Castle and thickness retention can be significantly improved. In addition, by arranging a part of the connecting thread 157 by cross-connecting and connecting the first and second stitch grounds 153 and 155, it is possible to prevent separation of the connecting thread during compression. Furthermore, it is possible to prevent the rocking motion in the axial direction of the press roll observed in the felt in which the three-dimensional knitted fabric which does not arrange by connecting the connecting chambers is not cross-connected.

Since the smoothing belt 127 is the same structure as the wetland conveyance felt 21 of the smoothing press apparatus 100 of 1st Example demonstrated previously in FIGS. 3-5, detailed description is abbreviate | omitted. However, as shown in FIGS. 3 and 4, the base body 41, the bat layer 43 (the first bat layer 43A and the second bat layer 43B), and the wetland contact fiber layer 45. It is provided. In addition, as shown in FIG. 5, the smoothing belt 127 includes a hydrophilic nonwoven layer 53 disposed longitudinally in the first batt layer 43A between the base body 41 and the wetland contact fiber layer 45. Further, it may include a polymer elastic material 55 in the wetland contact fiber layer 45.

The operation of this embodiment will be described. As shown in FIG. 6, the wetland W is sucked by the suction roll 61 so that one surface thereof is held by the conveying felt 19. The wetland W is squeezed out by the water-squeezing press rolls 15A and 15B, and is then sucked by the suction roll 63 and conveyed by the wetland conveying felt 121. The wetland W is sucked by the suction roll 123 and is transferred from the wetland conveying felt 121 to the smoothing belt 127. The wetland conveying felt 121 is a permeable belt including the three-dimensional knitted layer 151 as described above, and its surface is also a relatively rough surface.

On the other hand, the smoothing belt 127 has a wetland contact fiber layer 45 including a filament formed by dividing the split fibers 45A, and the surface thereof is very smooth. When the wetland W is niped, in addition to the property of adhering to a smoother surface, suction by the suction roll 123 also acts and reliably transfers it to the smoothing belt 127. One surface of the wetland W is pressurized by the first press roll 23 and the second press roll 25 together with the smoothing belt 127, thereby smoothing both surfaces of the wetland W.

In this case, one surface of the wetland W is in contact with the surface of the wetland contact fiber layer 45 of the smoothing belt 127 which is a smooth surface, and the other surface has a high surface hardness and has a smooth surface of the second press roll. In contact with (25) it is smoothed. Thus, the wetland W in which the surface roughness is greatly reduced is obtained. The wetland W is conveyed to the dryer part 13 via the canvas 65 and dried by the dryer 67.

According to the smoothing press apparatus 200 of this embodiment, the base body 141, the bat layer 143, the two stitch ground (153, 155) and the connection connecting the two stitch ground (153, 155) The wetland W is conveyed by the permeable wetland conveying felt 121 having the three-dimensional knitted layer 151 made of the yarn 157. The wetland W is then passed to a micro-permeable smoothing belt 127 having a wetland contact fiber layer 45 in direct contact with the wetland W, which includes at least split fibers 45A. The wetland W is also pressurized by a pair of press rolls 23 and 25 together with the smoothing belt 127 to smooth the surface of the wetland. Therefore, when the wetland contact fiber layer 45 is formed to include split fibers 45A which become filaments having very low fineness by division, the surface smoothness of the wetland W in contact with the wetland contact fiber layer 45 is improved. It is possible to obtain a very smooth wetland (W).

Further, the wetland contact fiber layer 45 includes a plurality of split fibers 45A divided into filaments and 1 wt% to 10 wt% polymer elastic material 55 impregnated between the filaments. Accordingly, the filament is bonded to some extent by the polymer elastic material 55, so that a so-called hair loss phenomenon hardly occurs, and the filament from the smoothing belt 127 is prevented from falling off. Thus, the wetland W having a very smooth surface can be obtained. In addition, since the smoothing belt 127 has an appropriate recovery function (cushionability), it is possible to form a large volume of the wetland W.

Further, the fibers forming the wetland contact fiber layer 45 are 15 wt% to 100 wt% of split fibers, and the remaining portion is made of undivided fibers. Therefore, the characteristics of the smoothing belt 127 can be selected by appropriately changing the blend ratio of the divided fibers and the undivided fibers.

(Third embodiment)

Next, the smoothing press apparatus of 3rd Example is demonstrated with reference to FIGS. In the smoothing press apparatus of the third embodiment, the wetland conveying felt is different from the smoothing press apparatus of the first embodiment. Since the other parts are the same as those of the smoothing press device 100 of the first embodiment of the present invention, the same parts are given the same reference numerals or corresponding codes, and the description thereof will be simplified or omitted.

12A to 12D show longitudinal cross-sectional views of the wetland conveying felt used in the smoothing press apparatus according to the third embodiment of the present invention, each of which is a longitudinal cross-sectional view of each embodiment in which the arrangement of layers containing molten fibers is changed. FIG. 13 is an enlarged cross-sectional view of the molten fiber, and FIG. 14 is a schematic explanatory view of a heat treatment apparatus for a wetland conveying felt containing molten fiber.

As shown in FIGS. 12A-12D, the wetland conveying felt 221 of this embodiment includes a base body 241, a bat layer 243, and a wetland contact fiber layer 245. More specifically, the first batt layer 243A is formed on the wetted side surface of the base body 241, and the second batt layer 243B is formed on the roll side or shoe side surface of the base body 241. The wetland contact fiber layer 245 is formed on the surface of the wetland side of the first batt layer 243A so as to be in direct contact with the wetland.

As shown in FIG. 12A, the base body 241 is for imparting strength to the wetland conveying felt 221. For example, nylon 6 and nylon 66 having excellent abrasion resistance, fatigue resistance, elongation characteristics and antifouling properties, and the like. Fabrics made of synthetic fibers, such as wool, natural fibers such as wool, and the like, which are superimposed without squeezing the yarn, or made into a film structure can be suitably used. In this embodiment, a woven fabric is adopted as the base body 241.

The bat layer 243 (the first bat layer 243A and the second bat layer 243B) is an undivided fiber layer formed by staple fibers of 6 dtex or more of fineness (generally, about 17 dtex). As the material for forming the batt layer 243, a material having the same form as that of the base body 241 is suitably used. The batt layer 243 is a collection of staple fibers, which stacks staple fibers on the base body 241 and stacks staple fibers on the base body 241 by a carding device (not shown). The bat layer 243 is formed and needle punched to interlock. Otherwise, the interlocked nonwoven layer may be interlocked by needle punching only the aggregate of staple fibers on the base body 241 and needle punching the nonwoven fabric and the base body 241.

The wetland contact fiber layer 245 consists of a molten fiber 249 and a non-melt fiber. Specifically, 50 wt% of the molten fiber 249 and the remaining portion (ie, 50 wt%) are made of non-melt fibers. The wetland contact fiber layer 245 laminates the molten fiber 249 and the non-melt fiber on the first batt layer 243A and interlocks with needle punching together with the base body 241.

The molten fiber 249 is a fiber whose melting point is 200 degrees C or less, Preferably it is 120 degreeC-180 degreeC, More preferably, it is about 140 degreeC, For example, it consists of copolymerized polyamide. Further, the non-melting fiber is a fiber having a melting point of 200 ° C to 300 ° C, preferably 220 ° C to 260 ° C, and is made of, for example, nylon 6 or nylon 66. It is preferable that the difference of melting | fusing point of the molten fiber 249 and a non-melted fiber is 60 degreeC or more, in order to make the heat processing mentioned later easy. Melting points are also measured by differential scanning calorimeters.

The molten fiber 249 is a core-in-sheath type molten fiber 249 having a fineness of 8 dtex, as shown in FIG. 13. The molten fiber 249 is formed by coating the outer circumferential surface of the core fiber 251 made of nylon 6 having a melting point of about 220 ° C with the copolymerized polyamide 253 having a melting point of about 140 ° C. The non-melt fibers consist of nylon 6 of fineness 11 dtex. Further, the wetland contact fiber layer 245 may be 15 wt% to 100 wt% of the molten fiber 249, and the remaining portion may be made of non-melt fiber. Moreover, as another heat meltable fiber 249, what consists of two types of composite fiber described in the specification of German Patent Application Publication DE19803493C1 is illustrated.

The arrangement of the fiber layer including the molten fibers 249 may be appropriately selected from various configurations as shown in FIGS. 12B to 12D in addition to FIG. 12A described above. In the wetland conveying felt 221 shown in FIG. 12B, molten fiber 249 is included in the first batt layer 243A and the second batt layer 243B. In the wetland conveying felt 221 shown in FIG. 12C, the molten fiber 249 is included only in the second batt layer 243B. In FIG. 12D, molten fiber 249 is included in the wetland contact fiber layer 245, the first batt layer 243A, and the second batt layer 243B.

In the wetland conveying felt 221 of this embodiment, fibers of any composition are laminated on the base body 241. The layer is needle punched and interlocked. Therefore, in the conventional method of impregnating or adhering a polymer material, the molten fiber 249 can also be disposed in the inner fiber layer, which is difficult to produce, to form a micro-transmissive layer or an impermeable layer. Thereby, the wetland conveying felt 221 which has the optimal characteristic to the wetland W to be grassed is obtained easily.

Such wetland conveyance felt 221 melts the molten fiber 249 by heat processing, and appropriate water permeability is provided. That is, as shown in FIG. 14, using a heat press roll 255, which is an example of a heat treatment apparatus heated at approximately 170 ° C. for 2 to 5 minutes by the heating apparatus 254, 50 kg / cm to 70 kg By passing a plurality of times between the hot press rolls 255 under the pressure of / cm, the molten fiber 249 melts and becomes the micro-permeable wetland conveying felt 221. By suitably changing the heat treatment conditions (temperature, pressure, passage count, heating time, etc.), the melt degree of the molten fiber 249 can be controlled. Thereby, arbitrary characteristics can be provided to the wetland conveyance felt 221. The wetland conveying felt 221 after heat processing is 1400 g / m <2> of fountain quantities, 0.480 g / cm <3> of density, and 8cc / (m <2> * sec) of breathability, for example.

The heat-treated micro-permeable wetland conveying felt 221 is combined with the smoothing belt 27 shown in FIG. 2 and attached to the smoothing press device 100 shown in FIG. 1 to paper the wetland W. . That is, with reference to FIG. 1, the wetland W conveyed from the water squeegee press rolls 15A and 15B is sucked by the suction roll 61, and one surface thereof is held by the conveying felt 19. FIG. . Thereafter, the wetland W is sandwiched and supported by the conveying felt 19 and the wetland conveying felt 221 (or, of course, the wetland conveying felt 21), so that the water-squeezing press rolls 15A and 15B It is supplied in between to squeeze out moisture. The wetland W in which water has been squeezed out is sucked and conveyed by the suction roll 63 and held in the wetland conveying felt 221 or 21. Thereafter, the wetland W is pressurized by a pair of transfer rolls 29A and 29B in a state of being supported by the conveying felt 19, the wetland conveying felt 221 or 21, and the smoothing belt 27. It transfers to the smoothing belt 27 from the wetland conveying felt 221 or 21. Further, the wetland W is supplied to the smoothing press 17 and is pressed together with the smoothing belt 27 by the first press roll 23 and the second press roll 25 so that both surfaces of the wetland W are closed. Smoothed. Thereafter, the wetland W is conveyed to the dryer part 13 through the canvas 65 and dried by the dryer 67.

According to the wetland conveying felt 221 of the present embodiment, the wetland is conveyed by the micro-permeable wetland conveying felt 221 having the wetland contact holding layer 245 in direct contact with the wetland W including the molten fibers 249. (W) is conveyed and passed to the impermeable smoothing belt 27 consisting of the base body 31 and the polyurethane layer 33, and the wetland W together with the smoothing belt 27 is a pair of press rolls ( 23, 25) to smooth the surface of the wetland (W). The molten fibers 249 are melted and bonded to each other by heat treatment, the air permeability of the wetland conveying felt 221 decreases, and the surface thereof is smoothed. Thus, by adjusting the heating method, a wetland conveying felt 221 having water permeability and compression recoverability (i.e. cushioning property) and having a smooth surface is obtained, and usefully preventing the re-humidity phenomenon of the wetland W surface. Smoothing can be achieved. In addition, even if the surface is smooth, paper separation is good, and the wetland W is reliably transmitted to the smoothing belt 27.

In addition, the molten fiber 249 is included in any single layer or multiple layers of the first batt layer 243A, the second batt layer 243B, and the wetland contact fiber layer 245 constituting the wetland conveying felt 221. The wetland conveying felt 221 is formed. Thereby, the micro-transmissive layer can be formed into any layer. In addition, it is possible to easily obtain the wetland conveying felt 221 having a water permeability and surface smoothness suitable for the characteristics of the wetland (W) to be grassland. Moreover, the wetland W having good paper separation and having a smooth surface can be efficiently grassed.

Further, when all of the wetland contact fiber layer 245 is melted, since it does not exhibit proper permeability, the wetland contact fiber layer (by the heat treatment of the degree remaining without melting the non-melt fiber and some of the molten fiber 249) 245 includes some unmelted fibers 249 and molten molten fibers 249. Thus, the wetland conveying felt 221 having appropriate water permeability and surface smoothness is obtained. Thereby, even if the surface is smooth, the separability of separation is good, and it is possible to reliably hand over the wetland W to the smoothing belt 27.

In addition, the fibers forming the first batt layer 243A, the second batt layer 243B, and the wetland contact fiber layer 245 including the molten fiber 249 are 15 wt% to 100 wt% of the molten fiber 249. % And the remainder are made of non-melt fibers, so that the properties of the wetland conveying felt 221 can be adjusted by appropriately changing the blending ratio between the molten fiber 249 and the non-melt fibers. The wetland conveying felt 221 is composed of a base body 31 and a polyurethane layer 33, and is suitable for use in combination with the smoothing belt 27 whose surface is smoother than the wetland contact fiber layer 245. Do. In addition, other actions and effects of the wetland conveying felt 221 of the third embodiment can be easily deduced from the above description of the first embodiment.

In addition, this invention is not limited to the Example mentioned above, A deformation | transformation, an outline, etc. are possible suitably. In addition, the material, formation, dimensions, numerical values, shapes, numbers, arrangement positions and the like of each component in the above-described embodiments are optional and are not limited as long as the present invention can be achieved.

While the invention has been described in detail with reference to specific embodiments, it will be apparent to those skilled in the art that various modifications or variations can be made without departing from the spirit and scope of the invention.

This application is a Japanese patent application No. filed May 31, 2005. Japanese Patent Application No. 2005-159965 and filed September 30, 2005. Claiming the priority of 2005-289138, the disclosures of which are incorporated herein by reference.

Claims (23)

A smoothing press device mounted to a press device installed in a press part of a closed draw type paper machine, A first press roll having a smooth surface; A second press roll having a smooth surface and facing the first press roll; A smoothing belt sandwiched between the first press roll and the second press roll with the wetland to smooth the wetland surface; A wetland conveying felt for conveying the wetland and handing it over to the smoothing belt; The wetland conveying felt has a wetland contact fiber layer comprising at least split fibers and in direct contact with the wetland, And said smoothing belt comprises a base body and a polyurethane layer in direct contact with said wetland. The method of claim 1, A smoothing press device, wherein the polyurethane contained in the polyurethane layer of the smoothing belt contains a non-reactive polydimethylsiloxane liquid and has a hardness of 90 ° to 98 ° in JIS A hardness standard. The method of claim 1, The polyurethane contained in the polyurethane layer of the smoothing belt is a polyurethane having a hardness of 90 ° to 95 ° in the JIS A hardness standard and containing a non-reactive polydimethylsiloxane liquid, and 95 ° in the JIS A hardness standard. A smoothing press device which is a mixture with a polyurethane having a hardness of from 98 ° to a non-reactive polydimethylsiloxane liquid. The method of claim 1, Polyurethane contained in the polyurethane layer of the smoothing belt is a mixture of a urethane polymer, a curing agent and a non-reactive polydimethylsiloxane liquid of 0.5 to 25 wt% based on the total amount of the urethane polymer and the curing agent. The smoothing press device formed by hardening. The method of claim 4, wherein Smoothing press device, wherein the curing agent is dimethylthiotoluenediamine or methylene-bisorthochloroaniline. The method according to any one of claims 1 to 5, The wetland conveying felt, A base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer comprising splittable fibers and formed on the surface of the wet side of the first batt layer to be in direct contact with the wetland. The method according to any one of claims 1 to 5, The wetland conveying felt, A base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; A wetland contact comprising a plurality of split fibers divided into filaments and a polymeric elastic material impregnated between the filaments, the wetland contact formed on the surface of the wetland side of the first batt layer such that the filaments and polymeric elastic material are in direct contact with the wetland A fibrous layer; And a hydrophilic nonwoven layer disposed between the first batt layer and the wetland contact fiber layer. The method of claim 7, wherein A smoothing press device, wherein the polymer elastic material contained in the wetland contact fiber layer has 1 to 10 wt%. The method according to any one of claims 6 to 8, A smoothing press device, wherein the fibers contained in the wetland contact fiber layer are composed of 15 to 100 wt% of split fibers and undivided fibers occupying the remainder. The method according to any one of claims 6 to 9, And the split fiber has a fiber fineness of 3.3 dtex or less before splitting. A smoothing press device attached to a press device installed on a press part of a closed draw type paper machine, A first press roll having a smooth surface; A second press roll having a smooth surface and facing said first press roll; A smoothing belt sandwiched between the first press roll and the second press roll with the wetland to smooth the wetland surface; A wetland conveying felt for conveying the wetland and handing it over to the smoothing belt; The wetland conveying felt comprises a three-dimensional knit fabric comprising a base body, a bat layer, two stitch grounds and an interlinking yarn connecting the two stitch grounds and partially intersecting diagonally. It includes; And the smoothing belt comprises a wetland contact fiber layer comprising at least split fibers and in direct contact with the wetland. The method of claim 11, The smoothing belt, A base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer comprising split fibers and formed on the surface of the wet side of the first batt layer to be in direct contact with the wetland. The method of claim 11, The smoothing belt, A base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; A wetland comprising a plurality of split fibers divided into filaments and a polymeric elastic material impregnated between the filaments, the wetlands formed on the surface of the wetland side of the first batt layer such that the filaments and the polymeric elastic material are in direct contact with the wetlands A contact fiber layer; And a hydrophilic non-woven layer disposed between the first batt layer and the wetland contact fiber layer. The method of claim 13, A smoothing press device, wherein the polymer elastic material contained in the wetland contact fiber layer has 1 to 10 wt%. The method according to any one of claims 11 to 14, A smoothing press device, wherein the fibers contained in the wetland contact fiber layer are composed of 15 to 100 wt% of split fibers and undivided fibers that occupy the remainder. The method according to any one of claims 11 to 15, And the split fibers have a fineness of 3.3 dtex or less prior to splitting. A smoothing press device attached to a press device installed on a press part of a closed draw type paper machine, A first press roll having a smooth surface; A second press roll having a smooth surface and facing said first press roll; A smoothing belt sandwiched between the first press roll and the second press roll with the wetland to smooth the wetland surface; A wetland conveying felt for conveying the wetland and handing it over to the smoothing belt; The wetland conveying felt comprises at least a wetland contact fiber layer comprising at least melttable fibers and in direct contact with the wetland; And said smoothing belt comprises a base body and a polyurethane layer in direct contact with said wetland. The method of claim 17, The wetland conveying felt, A base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer comprising a molten fiber and formed on the surface of the wet side of the first batt layer to be in direct contact with the wetland. The method of claim 17, The wetland conveying felt, Base body; A first batt layer formed on the surface of the wetland side of the base body and comprising the molten fiber; A second batt layer formed on the surface of the roll side of the base body and comprising the molten fiber; And And a wetland contact fiber layer formed on the surface of the wetland side of the first batt layer in direct contact with the wetland. The method of claim 17, The wetland conveying felt, Base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on the surface of the roll side of the base body and comprising the molten fiber; And And a wetland contact fiber layer formed on the surface of the wetland side of the first batt layer in direct contact with the wetland. The method of claim 17, The wetland conveying felt, Base body; A first batt layer formed on the surface of the wetland side of the base body and comprising the molten fiber; A second batt layer formed on the surface of the roll side of the base body and comprising the molten fiber; And And a wetland contact fiber layer comprising the molten fiber and formed on the surface of the wet side of the first batt layer to be in direct contact with the wetland. The method according to any one of claims 17, 18 and 21, The wetland conveying felt, Base body; A first batt layer formed on the surface of the wetland side of the base body; A second batt layer formed on a surface of the roll side of the base body; And a wetland contact fiber layer formed on the surface of the wet side of the first batt layer such that the molten fiber is melted by thermal processing and the molten fiber is in direct contact with the wetland. The method according to any one of claims 17 to 22, A smoothing press, wherein the fibers forming the first batt layer, the second batt layer and the wetland contact fiber layer containing the molten fiber comprise 15 to 100 wt% molten fiber and a non-melt fiber occupying the remainder; Device.

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