KR20000012346A - Shoe press belt and manufacturing method therefor - Google Patents

Abstract

PURPOSE: A belt for a shoe press and its production method are provided to have the intensity of the machine direction and of the CMD direction, and the size stability of the CMD direction, and to have the excellent productivity. CONSTITUTION: The belt for the shoe press comprises: a first resin layer(2) of the belt(1) formed in the polished surface of a mandrel(M); a detaching agent or a detaching sheet stuck on the surface of the mandrel(M); the smooth property of very inner layer of the belt(1) secured, and the removing property of the belt satisfied by gliding the first resin layer(2) in the state strongly contacted with a shoe(102); a basic fabric layer(3) arranged around the outer first resin layer(2); the basic fabric layer(3) formed by a fabric(P) using a yarn(S) of high intensity in the yarn of one side, and a yarn of high intensity or a yarn(Y) of non-high intensity in the yarn of the other side; the intensity of the width direction(CMD direction) given to the belt(1) by following the yarn(S) of high intensity of the fabric to the shaft direction of the mandrel(M).

Description

Shoe press belt and its manufacturing method {SHOE PRESS BELT AND MANUFACTURING METHOD THEREFOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt used for a shoe press mechanism, for example, a shoe press for papermaking, in particular, a belt used for a closed press shoe press and a manufacturing method thereof.

In the press area of paper making, the use of shoe presses has increased due to the reduction of the raw unit, and the closed type has a mainstream since the installation space may be narrow and the damage of oil splashing is small.

Since the belt used for the closed shoe press has excessive use conditions such as initial velocity, nip pressure, etc. during the papermaking process, compared to the belt used for the open shoe press. The durability improvement of a belt is strongly requested.

There are several known manufacturing techniques using mandrel as a typical method of manufacturing the closed belt type. For example, Japanese Patent Application Laid-Open No. 3-57236 and Japanese Patent Laid-Open No. 64-45889, which use endless woven fabrics for core materials, have the drawback of difficulty in circumferential dimension alignment.

Moreover, Japanese Unexamined-Japanese-Patent No. 1-503315 and Unexamined-Japanese-Patent No. 8-209578 are among the manufacturing methods which do not use a cloth. This is because the high-strength thread is tightened over the entire circumference at regular intervals in the direction of the cross-machine (CMD) of the mandrel, but there is a drawback that the high-strength thread is elongated and takes a very long time.

In addition, Japanese Patent Application Laid-Open No. 1-298292 and Japanese Patent Laid-Open No. 5-505428 disclose a manufacturing method in which a mat-like fiber band or fabric impregnated with an uncured resin is wound in a spiral shape and cured. However, these have the drawback that peeling easily occurs in the seam of a spiral.

Next, according to the conventional manufacturing method of the shoe press belt, an endless woven fabric (fabric woven in endless fabric) C is firmly installed between two rolls (A) and (B). After impregnating and curing the first resin layer (E) by the applicator (D) on the outer surface of the fabric, the endless fabric (C) is separated between the rolls (A) and (B) to reverse the surface and the inside. First, the outer surface of the fabric was hanged directly between the rolls (A) and (B), impregnated and coated with a second resin layer (F) on the outer surface of the fabric, and cured to adjust the overall thickness. G) was formed to obtain a belt.

Therefore, in the conventional method, 1) in order to impregnate the second resin layer on the back surface of the endless fabric, it is necessary to invert it, and deformation occurs inside the belt at this time.

2) There was a drawback that the belt's sway caused instability because the deformation inherent during the weaving of the woven fabric was opened during curing of the resin.

As described above, the conventional closed-type shoe press belt is not a degree having various inherent shortcomings, but is a belt obtained by a manufacturing method based on an endless fabric, which is provided tautly between two rolls. Since is used by applying tension in the CMD direction, the dimension of the CMD direction tends to change, which is one of the major causes of reducing the belt life.

The present invention improves the various inherent drawbacks as described above, and provides a high productivity shoe press belt having a strength in the CMD direction and a dimensional stability in the CMD direction together with a machine (MD) direction, and a manufacturing method thereof. It is aimed at.

In order to achieve the above object, the shoe press belt according to the present invention has a polished surface and a fabric piece using a high-strength thread on at least one thread intersecting with the first resin layer of the endless formed on the rotatable mandrel surface. And a base cloth layer which is disposed on the outer periphery of the first resin layer as a whole such that the high strength thread is along the axial direction of the mandrel, and a high-strength winding spirally wound around the outer periphery of the base fabric layer in a circumferential direction. Layer and an endless second resin layer formed on the outer circumference of the real winding layer, wherein the second resin layer is in contact with the first resin layer through the base cloth layer and the real winding layer. It was configured to exhibit sufficient strength in both directions and CMD directions.

Moreover, the manufacturing method which concerns on the invention of Claim 2 forms the endless 1st resin layer on the rotatable mandrel surface which has a polished surface, and to one thread which at least intersects the outer periphery of this 1st resin layer. The fabric piece using the high strength thread is arranged as a whole so that this high strength thread may follow the axial direction of the mandrel to form a base cloth layer, and a high strength thread is spirally wound around the outer periphery of the base cloth layer in a circumferential direction, and the thread winding After forming the layer, the second resin layer of the endless is formed on the outer circumference of the real winding layer to contact the first resin layer through the base cloth layer and the real winding layer, and is simple, easy and more productive. It was configured to contribute to the improvement.

1 is a partial enlarged cross-sectional view of the present invention belt,

Figure 2a is a side cross-sectional view of the mandrel showing the formation process of the first resin layer of the present invention,

Figure 2b is a perspective view of a mandrel formed with the first resin layer of the present invention,

3 is a perspective view of a shoe press mechanism using the present invention belt,

4 is a partial plan view for explaining a fabric piece used in the base fabric layer of the present invention,

5 is a perspective view showing a process of arranging one piece of fabric of a base cloth layer on the outer surface of the first resin layer formed on the surface of the mandrel of the present invention;

Figure 6 is a perspective view showing a plurality of pieces of fabric to be the base fabric layer of the present invention,

7 is a perspective view showing a process of forming the present invention winding layer,

Figure 8a is a side cross-sectional view showing a manufacturing process of a conventional shoe press belt,

Fig. 8B is a partial sectional view of the shoe press obtained by the conventional method.

<Description of the symbols for the main parts of the drawings>

DESCRIPTION OF SYMBOLS 1 This belt 2 The 1st resin layer

3: base layer 4: real winding layer

5: 2nd resin layer 6: contact surface of 1st resin layer and 2nd resin layer

7: groove T: applicator

P: Fabric piece P _1, P ₂ : Both ends of the fabric piece

P ′, P ″: Multiple pieces of fabric piece

P ₁ ′, P ₂ ′, P ₁ ″, P ₂ ″: Both ends of the monolith of the fabric piece

S: High strength thread used for woven fabric

Y: Thread which crosses high strength thread used for fabric piece

Sy: High strength thread used for real winding layer

M: Mandrel J: Mandrel Axial

100: shoe press mechanism 101: press roll

102: Shoo A, B: Roll

C: Endless woven fabric

D: Applicator E: First Resin Layer

F: Second Resin Layer G: Groove

Next, embodiments of the present invention will be described with reference to the drawings.

1 is a partially enlarged cross-sectional view of the belt of the present application, Figure 2a is a side cross-sectional view of the mandrel showing the formation of the first resin layer, Figure 2b is a perspective view of the same, Figure 3 is a perspective view of the shoe press mechanism using the belt of the present application, Figure 4 is a foundation Partial plan view for explaining the fabric piece using the cloth layer, Figure 5 is a perspective view showing the process of arranging one piece of the fabric piece of the base fabric layer on the outer surface of the first resin layer formed on the mandrel surface, Figure 6 is a base fabric layer A perspective view showing a plurality of fabric pieces to be, Figure 7 is a perspective view showing a process of forming a real winding layer.

The 1st resin layer 2 of the belt 1 of this application shown in FIG. 1 is formed in the polished surface of the mandrel M like FIG. 2B. In this case, a release agent (not shown) is applied to the surface of the mandrel M in advance, or a release sheet (not shown) is adhered to it, and an applicator (such as a doctor bar or a coater bar) is placed thereon as shown in FIG. 2A ( Using T), the thickness is formed to be about 0.5 mm to 2.0 mm.

Since the belt 1 of the present application is passed between the press roll 101 and the shoe 102 of the shoe press mechanism 100 as shown in FIG. 3, the first resin layer 2 constituting the innermost layer of the belt 1 of the present application belt 2 is formed. ) Is always in a state of being in strong contact with the shoe 102, so high smoothness is required.

Since this smoothness is ensured on the polished surface of the mandrel M as mentioned above, the post-processing for obtaining smoothness is unnecessary.

The polishing of the surface of the mandrel M is, of course, intended not only to secure the smoothness of the innermost layer of the belt 1 of the present application, but also to improve the detachability of the finished present belt.

In addition, a heating device (not shown) is additionally provided in the mandrel M, so that curing of the resin including the first resin layer 2 can be accelerated.

The base fabric layer 3 is disposed on the outer circumference of the first resin layer 2. The base fabric layer 3 is formed of a fabric piece P using at least one of the high strength yarns S at one cross and at least one of the high strength yarns and the non-high strength yarns Y, as shown in FIG. 5. This high strength seal S is disposed throughout the outer circumference of the first resin layer 2 so as to follow the axial direction J of the mandrel M. As shown in FIG.

The fabric piece P has a high-strength thread S along the axial direction of the mandrel M, for imparting strength in the width direction (CMD direction) to the belt 1 of the present application.

Therefore, although it is not restrict | limited that both yarns which comprise the fabric piece P together are not restrict | limited, Even if it is a non-high strength thread in the cross | intersection with the high strength thread of the fabric piece P in the role of the said base cloth layer 3, It is good as long as it can hold | maintain the said high strength seal S as a function.

The fabric piece P is composed of one piece as shown in Fig. 5, and after turning the outer circumference of the first resin layer 2 by one round, the both ends P ₁ and P ₂ are also covered with each other. 6, and composed of a plurality of pieces, each end of each piece of fabric (P ′) (P ″) (P ₁ ′) and (P ₂ ″) and (P ₂ ′) and (P ₁ ″) It is also good to cover the outer circumference of the first resin layer 2 as a whole while facing each other. The choice of one or several is free, but from the point of view of workability, it is expected to use the latter, or more.

In the outer circumference of the base fabric layer 3, a solid winding layer 4 is formed in which a high strength yarn Sy is wound in a circumferential direction. As shown in FIG. 7, the real winding layer 4 has a spiral high strength spirally over the entire area around the base fabric layer 3 while the bobbin Bo holding the high strength yarn Sy rotates around the mandrel M. As shown in FIG. The yarn Sy is wound up.

In this case, the bobbin Bo may be wound in a plurality of sets using a plurality of bobbins. This real winding layer 4 is effective because it imparts strength in the circumferential direction (MD direction) to the belt 1 of the present application.

Further, the second resin layer 5 of the endless is formed on the outer circumference of the real winding layer 4. The second resin layer 5 penetrates through the base cloth layer 3 and the real winding layer 4, and is in contact with the outer surface of the first resin layer 2. Although the contact surface 6 of these 1st resin layer 2 and the 2nd resin layer 5 melts and integrates, you may improve integration by using a primer or an adhesive agent as needed.

Resin used for the said 1st resin layer 2 and the 2nd resin layer 5 can be chosen from a rubber | gum and an elastic substance, Preferably a polyurethane resin is used. As this polyurethane resin, when it is set as the physical property surface, a thermosetting urethane resin is preferable, and what is necessary is just to select in the range of hardness 80-98 degrees (JIS-A). Of course, the hardness of the first resin layer 2 and the second resin layer 5 may be the same or different.

The high-strength thread S used for at least one cross | intersection thread of the fabric piece P used as the said base fabric layer 3 gives intensity | strength of the width direction (CMD direction) to the belt 1 of this application as mentioned above. Therefore, as shown in Fig. 4, a relatively thick rigid yarn, for example, a monofilament yarn, a multifilament yarn, or a twisted yarn equivalent to 800 to 6000 denier is used, and the yarn Y intersecting this is a high strength yarn S. It is enough if it can support so that there is no gap. The fabric of this fabric piece (P) is not particularly problematic, but a two-ply, three-ply or one-ply tissue is used.

The raw material of the high strength thread S used for the said fabric piece P is high modulus, such as nylon, polyester, aromatic polyamide, aromatic polyimide, high strength polyethylene, and high elastic modulus fiber. It is preferable that the strength is in the range of 120 to 250 kg / cm and 1% modulus is 10 to 40 kg / cm. Moreover, it is also possible to use inorganic fibers, such as carbon fiber and glass fiber.

When the fabric P is disposed on the outer periphery of the first resin layer 2, the mandrel is slightly removed before the first resin layer 2 is cured (while still maintaining crosslinkability). While rotating, the high strength seal S is arranged along the axial direction of this mandrel and pressed.

In the above-mentioned case, when the piece of fabric P is one piece, the dimension is adjusted to 99.7 to 100% with respect to the circumferential dimension of the first receptacle layer 2 and covered by turning one turn. At this time, it is possible to easily work by extending a plurality of circumferential threads at both ends and fixing the whole by connecting the extension threads. In addition, when there are several pieces of fabric (P), it is most important to surround each other so that the end gaps do not pass through each other or overlap.

The material of the high strength yarn (Sy) used for the said real winding layer 4 is high strength, high modulus, such as nylon, polyester, aromatic polyamide, aromatic polyimide, and high strength polyethylene like the said high strength yarn (S), Monofilament yarns, multifilament yarns or their twisted yarns made of high modulus-containing fibers are used.

The high strength yarns (Sy) are wound into 20 to 50 pieces / 5 cm in a multifilament (4500d) of nylon or PET, and 10 to 30/5 cm in a multifilament (3000d) made of an aromatic polyamide, It is preferable to manufacture so that the strength of a final product may be 170-250 kg / cm.

The second resin layer 5 may be formed after winding the high strength yarn Sy to form the real winding layer 4, but may be parallel to the winding of the high strength yarn Sy.

After the formation of the second resin layer 5, the surface is polished to a target thickness of the belt 1 of the present application belt in preparation for curing of the resin, and the grooves (holes may be blocked) 7 may be formed on the surface as necessary. The finishing process is performed to obtain the belt 1 of the present application.

Thereafter, the belt 1 of the present application is separated from the mandrel M. FIG. As described above, this detachment is easily performed by using a peeling material or a peeling sheet on the surface of the mandrel in advance, by using hydraulic pressure or hydraulic pressure, or by using the expanded water side of the resin.

Example 1

A release agent (KS-61: manufactured by Seatsu Chemical Co., Ltd.) is applied to the polished surface of the mandrel with a rotatable diameter of 1500 mm by suitable driving means. A thermosetting urethane resin (prepolymer: Takenet L2395 (Takeda Pharmaceutical Co., Ltd.), curing agent: 3,3'-dichloro-4,4'-diaminodiphenylmethane) is applied to the mandrel surface with a doctor bar in a thickness of 1 mm. And left for 10 minutes.

Next, the fabric piece (30 weft mesh / 5cm, warp fabric which is woven in two layers by using a polyester yarn of 800d monofilament yarn as a warp and a polyester 4500d multifilament yarn (a high-strength thread S as a weft yarn) 40 meshes / 5 cm) (P) was wound around the outer periphery of the first resin layer with 4500d multifilament yarns (high strength thread S) along the axial direction of the mandrel and pressed against both ends. .

Thus, when the base cloth layer 3 is formed in the outer periphery of the 1st resin layer 2, the 4500 d multifilament system (high-strength thread Sy) of polyester is spirally formed to the outer periphery 30 Winding was wound at a pitch of 5 cm to form a solid winding layer 4.

Subsequently, after impregnating and apply | coating the thermosetting urethane resin 5 like resin used for the said 1st resin layer 2 from the upper winding layer 4 to 5.5 mm thickness, and heat-hardening at 100 degreeC for 5 hours, After the surface of the resin layer 5 was polished to have a total thickness of 5.2 mm, grooves 7 were formed in the circumferential direction with a rotary knife to obtain the belt 1 of the present application.

As shown in Fig. 8, an endless fabric (C) is sandwiched between two rolls (A) and (B), and a thermosetting urethane resin (prepolymer: Takenet L2395) is applied to the surface of the fabric (C) by an applicator (D). (Takeda Pharmaceutical Co., Ltd.), curing agent: 3,3'-dichloro-4,4'-diaminodiphenymethane) is impregnated and heat-hardened. The outer periphery of the resin is polished to form the first resin layer (E).

Next, the first resin layer (E) is inverted so that the inner side and the endless fabric are turned to the outside, and impregnated and applied a thermosetting urethane resin such as the resin used for the first resin layer on the outer circumference of the fabric to 5 at 100 占 폚. The second resin layer (F) was formed by heat-hardening for a time, the second resin layer (F) was polished to a total thickness of 5.2 mm, and then a groove (G) was formed in the circumferential direction with a rotary knife to compare the belt. (1 ') was obtained.

The physical properties of the belt 1 and the comparison belt of the present application were compared with the time from forming the first resin layer to before forming the second resin layer. In other words,

table

-------------------------------------------------- ---------------------

Belt comparison belt

-------------------------------------------------- ---------------------

Radial cutting strength (kg / cm) 200 186

(MD) Cutting Ductility (%) 15.0 14.3

1% Modulus (kg / cm) 32.9 30.6

-------------------------------------------------- ---------------------

Cutting strength in the upward direction (kg / cm) 200 156

(CMD) Cutting Ductility (%) 13.6 49.9

1% Modulus (kg / cm) 15.2 9.7

-------------------------------------------------- ---------------------

After forming the first resin layer, the second resin layer

1 10

Hour before forming

-------------------------------------------------- ---------------------

In the above table, the belt of the present application is superior in physical properties to the comparison belt.

The endless fabric used as the base fabric layer of the comparison belt is inverted while forming the first water layer or the internal deformation of the fabric due to the tendency of the weft's arrangement to be mixed during weaving, or the tendency of the phase crimp to increase to form the second resin layer. Although the belt dimension becomes unstable due to internal deformation due to load at the time of reversal, it is judged that the belt of the present application does not have such internal deformation, so that the dimension in the CMD direction is particularly stable.

In addition, the belt of this application can be manufactured in a short time compared with a comparison belt in the said table | surface. In comparison with the endless fabric, the comparison belt is inverted to form the first resin layer to form the second resin layer, but until the inversion, the first resin layer must be heat-cured, and therefore, at least 10 hours ( In this belt, it is not necessary to perform such a reversal and the like, and the time from forming the first resin layer to forming the second resin layer ends in approximately one hour, thereby shortening the manufacturing time. Significant contribution to the process.

As described above, the shoe press belt according to the present invention exhibits the following excellent effects.

(1) Since the first resin layer constituting the innermost portion of the belt of the present application is formed from a mandrel surface having a polished surface, a smooth surface is obtained at the same time of formation and no post-processing is required.

(2) Since the base cloth layer of the belt of the present application is composed of a piece of fabric, it is a stepped piece, and the circumferential dimension can be easily adjusted at the time of manufacturing the belt of the present application, and the manufacturing cost can be reduced.

(3) Since the high-strength thread used for at least one thread which cross | intersects the base cloth layer of this belt is arrange | positioned so that along the axial direction of the said mandrel, sufficient strength can be exhibited in a CMD direction. Therefore, a stable running state with a very high dimensional accuracy of the product can be maintained for a long time.

(4) Since a real winding layer made of a high strength thread is formed on the outer circumference of the base cloth layer of the belt of the present application, sufficient strength can be exhibited even in the MD direction.

(5) Since the second resin layer constituting the outermost layer of the belt of the present application is integrated with each other in contact with the first resin layer on which the base cloth layer and the real winding layer are impregnated, the belt is subjected to the stress acting on the belt during use. Destruction and peeling of the resin layer can be greatly reduced.

Further, according to the manufacturing method according to the invention of claim 2, after the first resin layer is formed, there is no need to polish or invert the first resin layer, and the work efficiency can be drastically improved, and the productivity This effect can be obtained.

Claims (2)

The first piece of the endless first resin layer having a polished surface and formed on the rotatable mandrel surface, and a fabric piece using a high strength thread in at least one thread intersecting the first piece so that the high strength thread is along the axial direction of the mandrel. The base fabric layer disposed over the entire circumference of the strata, the real winding layer wound spirally in the circumferential direction, and the endless layer formed on the outer circumference of the real winding layer. And a second resin layer, which is in contact with the first resin layer through the base cloth layer and the real winding layer. An endless first resin layer is formed on the rotatable mandrel surface having a polished surface, and the high-strength thread is a fabric piece using a high-strength thread on at least one thread intersecting the outer periphery of the first resin layer. After laying around the circumferential direction of the mandrel to form a base cloth layer, and winding a high-strength thread spirally around the circumferential direction around the outer periphery of the base cloth layer to form a real winding layer, A method for manufacturing a shoe press belt, characterized in that a second resin layer of the endless is formed in contact with the first resin layer through the base cloth layer and the real winding layer.