JP2002161492A - Composite fabric for paper making - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite fabric for paper making, capable of affording an area having excellent cushionability, fatigue resistance, surface character and moisture absorptionproofness. SOLUTION: This composite fabric 1A for paper making is made up of a base 2 and a cushioning resin material 3. The base 2 is a two-layer fabric with double weft and double warp composed of an obverse layer 21 and a reverse layer 22 both of which are joined via joining yarns 4 to each other, the obverse layer 21 is surface-polished at 30 μm and the surface of the reverse layer 22 representing the travel face is coated with an abrasion-resistant resin to form a reverse resin layer 5. The cushioning resin material 3 is a sheet-like polyurethane material 0.8 mm thick representing the paper making face side of the composite fabric 1A and bonded via a nylon resin adhesive to the obverse layer 21 side of the base 2 to effect unification.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite fabric for papermaking, and more particularly, it can be easily manufactured without using special materials, equipment and manufacturing methods, and has a cushioning property.
It is excellent in fatigue resistance, and it can be made into a region with excellent surface properties and moisture absorption protection only at the point of contact with wet paper without destroying the elastic behavior of the base, and can be applied to various parts such as for press and transport The present invention relates to a composite fabric for papermaking.

[0002]

2. Description of the Related Art Conventionally, in the papermaking process, a wet web which has been dehydrated by a wire part is received and carried to a press part, and water is further squeezed through press rolls. Papermaking fabrics are used to send. Conventionally, a papermaking woven fabric suitable for the performance required in each part such as the wire part, the press part, and the dry part has been used.

[0003] Conventionally, a desired composite fabric for papermaking has been manufactured by impregnating or coating a resin having a high degree of polymerization in a liquid state on a reinforcing base (base). For example, a conveyor belt described in Japanese Patent Application Laid-Open No. 6-57678 discloses a resin that forms a layer at least substantially impermeable to air and water on its paper layer side by coating, impregnation, film lamination, or the like. Is provided. However, as described above, in the method of manufacturing a composite fabric for papermaking by impregnating or coating a resin having a high degree of polymerization in a liquid state, when forming a resin layer by impregnating or coating a resin, It is difficult to achieve a uniform layer,
The work during the process is also difficult, and furthermore, in order to impregnate or coat with the resin, it is necessary to introduce necessary equipment, and as a result, a great improvement of the equipment is required. is there.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can be easily manufactured without using special materials, devices, and manufacturing methods, and has excellent cushioning and fatigue resistance. A composite fabric for papermaking that can be applied to various parts, such as for presses and transport, can be used as an area with excellent surface properties and moisture absorption protection only at the point of contact with wet paper without destroying the elastic behavior of the base. The purpose is to provide.

[0005]

Means for Solving the Problems To achieve the above object, the inventor of the present invention has conducted intensive studies on the structure of a papermaking fabric. By bonding the sheet to the substrate in advance and integrating it with the substrate, it is excellent in cushioning and fatigue resistance, and has only the surface contact with the wet paper without deteriorating the elastic behavior of the substrate. The present inventors have found that the present invention can be applied to various parts such as a press area and a transport area, and have completed the present invention.

The papermaking composite fabric according to the first aspect of the present invention comprises a rigid base and a buffer resin material provided in contact with the surface of the base, and the base and the polymer resin material are bonded to each other. It is characterized by being integrated by.

[0007] The above-mentioned "substrate" constituting the composite fabric for papermaking according to the first aspect of the present invention is made of yarn for woven fabric for papermaking. The above-mentioned “substrate” is usually the one shown in FIG.
As shown in FIG. 1, the weft (surface layer side weft 211 and back layer side weft 221 in FIG. 1) and warp (surface layer side weft 21 in FIG. 1)
2 and the back layer-side warp 222) are woven, but there is no particular limitation as long as the yarn is made of a papermaking yarn. The type, material, and properties of the papermaking yarn constituting the "substrate" are not particularly limited, and various fibers having properties required for the intended use can be used. For example, examples of the material include polyethylene terephthalate, 6 nylon, 66 nylon, 612 nylon, Kepler, and the like. Also, the wire diameter can be various. Further, a composite yarn using a material having two or more components may be used instead of a single yarn composed of a single component. As such a composite yarn, as shown in Japanese Patent Application No. 2000-300289, besides a composite yarn having a core-sheath structure that simply covers the second material with respect to the first material,
It is also possible to use a composite yarn in which two or more components are arranged in a spiral shape and the components are attached to form a single yarn. Such a composite yarn is used, in particular, as a direction yarn crossing the traveling direction. By using such a composite yarn, various properties such as smoothness and strength of the substrate can be varied as required.

[0008] The "substrate" according to the first aspect of the present invention.
Is not particularly limited, and may be various thicknesses depending on the application. For example, the thickness of the “substrate” is usually 0.8 to 2 mm, preferably 0.8 to 1.
It can be 5 mm, more preferably 1 to 1.5 mm. By setting the thickness of the “substrate” to such a range, the thickness of the composite fabric for papermaking to which the resin material is bonded without impairing the characteristics of the “substrate” can be reduced to a thin structure of less than about 3 mm, As a result, the load (power load) during traveling can be reduced, and the operating cost can be reduced, which is preferable.

The nature of the above-mentioned "substrate" can be varied depending on the application. For example, a rigid fabric for forming and dry parts or a flexible fabric for press parts can be used. It can be.
In this case, as described in claim 2, as a property of the "substrate", a recovery rate of a thickness when the pressure is reduced at 50 kg / cm ² for 10 seconds and then depressurized is 70% or more, preferably 85% or more.
More preferably, it can be 90% or more. By having such characteristics, even when the papermaking composite fabric is pressed and its surface shape is deformed when passing through the press part in the papermaking process, the shape is immediately restored to its original shape. Is preferred because the elasticity and smoothness of the polymer are maintained and do not affect the subsequent steps. Incidentally, the recovery rate in claim 2 is a numerical value obtained by a repeated compression test using Tensilon based on the above conditions.

[0010] The structure of the above-mentioned "substrate" according to the first aspect of the present invention is not particularly limited, and may be a single-layer structure.
As described in claim 3, a structure having at least two layers or more can be formed by a method of weaving two or more warp yarns or two or more weft yarns. With such a multilayer structure, the elasticity of the papermaking composite fabric with respect to the press can be maintained, and the back surface (running surface side) can be prevented from being worn. As a result, the durability of the papermaking composite fabric can be improved and the life can be extended. This is preferable because

In the papermaking composite fabric according to the present invention, the surface of the substrate can be subjected to surface polishing. By performing such surface polishing on the surface of the substrate, the smoothness of the substrate is improved,
It is preferable because the adhesiveness with the buffer resin material is improved. In the case where the surface of the substrate is subjected to surface polishing, the amount of surface polishing can be generally 30 μm or more and less than 70 μm, preferably 30 to 50 μm, and more preferably 35 to 50 μm. By making it into such a range, without lowering the strength of the papermaking fabric, the surface is polished more than before to improve the smoothness and surface properties of the papermaking fabric, and as a result, It is preferable because the adhesiveness can be improved. Here, the “surface polishing amount” is, as shown in FIG. 4, the difference between the highest point of the papermaking side fabric layer before polishing and the height of the papermaking side fabric layer (B) surface after polishing. (H in FIG. 4).

Further, in the papermaking composite fabric of the present invention, the back surface of the substrate can be coated or impregnated with a wear-resistant resin, as described in claim 5 (see FIG. 1). Such a configuration is preferable because it is possible to prevent abrasion on the back surface side of the substrate serving as a running surface in the papermaking process and to extend the life of the papermaking composite fabric. The “back side” means the surface of the substrate on which the buffer resin material is not provided. Examples of the above-mentioned "wear-resistant resin" include nylon resin, urethane resin, Teflon (trade name) resin, and the like.

The above-mentioned "resin material for buffer" according to claim 1.
Is a sheet-like or mat-like material adhered to the surface of the substrate. The thickness of the “buffer resin material” is not particularly limited, but is usually equal to or smaller than the base, and can be, for example, less than 1 mm in thickness as described in claim 6. . Such a configuration is preferable because it is possible to provide a region excellent in surface properties and moisture absorption protection only at the contact point with the wet paper without breaking the elastic behavior of the base.

The material of the "buffer resin material" is not particularly limited, but may be usually made of urethane or an elastomer. Due to this, it has excellent cushion resistance and fatigue resistance, and when passing through the press part in the papermaking process,
Even if the surface shape of the papermaking composite fabric is deformed due to the application of pressure, the shape is immediately restored to its original shape, so that the smoothness of the papermaking composite fabric is maintained and the subsequent processes are not affected, which is preferable. Furthermore, it is preferable to use a porous resin material as the buffering resin material, since the cushioning property and fatigue resistance of the buffering material can be improved. In addition, since the conventional press blanket has a hygroscopic property, the moisture transferred to the press blanket in the press stage of the stock is transferred to the stock side again after exiting the press nip, which causes a decrease in dewatering efficiency. As described in claim 9, the water permeability of the buffer resin material is 1 cc / sec / water pressure of 5 kg / cm ^2.
cm ² or less is preferable because it is possible to prevent moisture re-absorption of the stock during transportation after exiting the press nip, and to prevent a decrease in dewatering efficiency of the stock.

In the composite fabric for papermaking of the present invention, the bonding pattern of the buffer resin material is not limited, and the sheet-like or mat-like buffer resin material having the same size as the base is bonded. The buffering resin material smaller than the substrate can be bonded at at least one position over the entire width in the machine traveling direction of the substrate. In this case, it is preferable that the connecting portions are as close as possible and inconspicuous, but there may be a gap between the buffer resin materials.

In the composite fabric for papermaking of the present invention, the base and the buffer resin material are integrated on the surface of the base by adhesion. The method of bonding the base and the resin material for buffering is not limited. For example, as described in claim 10, the bonding can be performed using a resin such as a nylon resin or a urethane resin, or a double-sided tape. Thereby, the composite fabric for papermaking of the present invention can be obtained without using a specially designed product. In the case of bonding with a double-sided tape, the double-sided tape has a cushioning property, and a double-sided tape having a thickness of less than 0.2 mm can be used. This is preferable because the base and the buffer resin material can be bonded by a simple means without significantly affecting the thickness of the entire papermaking composite fabric after bonding.

In the composite papermaking fabric according to the present invention, the base and the buffer resin material are bonded by a resin such as a nylon resin or a urethane resin or a double-sided tape. As shown in, or sewn the base and the buffer resin material,
Alternatively, as described in claim 13, the base and the buffer resin material can be bonded with a resin screw.
Providing such a configuration is preferable because the adhesiveness between the base and the buffer resin material can be reinforced, and the strength of the composite fabric for papermaking can be improved.

In the composite fabric for papermaking according to the present invention, a bat layer may be interposed between the base and the resin material for buffering. Examples of the bat layer include synthetic fibers (nylon, polyester, Kepler, etc.). By adopting such a configuration, cushioning properties are imparted to the composite fabric for papermaking, so that a more flexible structure can be obtained, which is preferable. The means for implanting the bat layer in the substrate is not particularly limited, and may be implanted by needling using a needle.However, when implanted in the substrate by a water jet, compared with the needling case, This is preferable because it prevents the density difference of the fibers from occurring, improves the smoothness of the substrate, and increases the bonding property of the buffer material. In claim 14, “the bat layer is sandwiched” between the base and the buffer resin material is only when the bat layer is sandwiched between the base and the buffer resin material. But not Figure 3
As shown in the above, there is also a case where the fibers are implanted by being entangled by needling or the like in the gaps of the above-mentioned substrate which is a woven fabric.

According to the fifteenth aspect of the present invention, the composite fabric for papermaking has a permeability of 5 cc / cm as measured by a Frazier type tester (JIS L1004) under no pressure.
sec / cm ² or less, preferably 4 cc / sec / cm ²
Hereafter, it is more preferably 3 cc / sec / cm ² or less. By setting the content in such a range, the air permeability is almost eliminated, and as a result, it is possible to allow the papermaking fabric to run with a lower load as compared with the case where the papermaking fabric is allowed to run with water. Further, the use of the composite fabric for papermaking of the present invention is not limited, but as described above, when a resin material having low hygroscopicity is used as the buffer resin material, during the transfer after leaving the press nip, Since the paper material hardly absorbs moisture again, it can be suitably used particularly as a wet paper web transfer belt.

The method for producing the composite fabric for papermaking of the present invention is not particularly limited, but usually, a sheet-like or mat-like buffer resin material prepared in advance is arranged on the surface of the base, and the base and the buffer are formed. At least 80 resin material
It is manufactured by bonding in an atmosphere at a temperature of not less than ° C. When bonding the base and the resin material for buffering with a resin or a double-sided tape or the like, it is preferable to place the base and the buffer resin material in an atmosphere of at least 80 ° C. or higher, since the adhesion between them can be enhanced. Further, after bonding the base and the buffer resin material, the base and the buffer resin material are sewn, or by fixing the base and the buffer resin material with a resin screw, It is preferable because the adhesiveness between the base and the resin material for buffer can be reinforced to improve the strength of the manufactured composite fabric for papermaking.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the composite fabric for papermaking of the present invention will be specifically described with reference to examples. (1) Example 1 FIG. 1 shows a schematic cross-sectional view of a composite fabric 1A for papermaking of Example 1. As shown in FIG. 1, the papermaking surface fabric 1 </ b> A of the first embodiment includes a base 2 and a buffer resin material 3. The buffer resin material 3 is made of urethane and has a thickness of 0.8 m.
m sheet-like material, which is adhered to the surface side of the base 2 with a nylon resin adhesive. In the papermaking composite fabric 1A of the first embodiment, the buffer resin material 3 side is the papermaking surface side.

The base 2 is a rigid woven fabric for a forming part, and includes a surface layer side warp 211 and a surface layer side weft 212 constituting the surface layer 21 and a back layer side warp 221 constituting the back layer 22. It is composed of a double-layer woven fabric of double weft, double warp and double weft, which weaves the back layer side weft 222. The surface layer 21 and the back surface layer 22 are connected by the binding yarn 4. The surface layer side warp 211 and the surface layer side weft 212 are made of polyester having a diameter of 0.17 mm. The back layer side warp 221 is made of polyethylene having a diameter of 0.20 mm, and the back layer side weft 222 has a diameter of 0.25 m.
m, a composite yarn having a spiral structure containing a urethane component. The binding yarn 4 is made of 0.15 mm nylon. Further, the surface layer 21 is polished to a surface of 30 μm, and the front side of the back layer 22 serving as a running surface (the lower surface in FIG. 1).
Is coated with a trade name “Teflon” as a wear-resistant resin to form the back surface resin layer 5.

[0023] Composite fabric 1A for papermaking of Example 1
Can be easily manufactured because the base fabric for forming or pressing is not impregnated with a resin as in the related art, but is formed into a sheet in advance and bonded to a base to be integrated. Further, since the buffer resin material 3 of Example 1 has almost no hygroscopicity, there is almost no re-absorption of moisture during transportation after leaving the press nip, so that it can be suitably used particularly as a wet paper web transfer belt. . Moreover, since the cushioning resin material 3 is excellent in cushioning properties, the shape immediately recovers even when pressed in the press part, so that the subsequent steps are not affected. Furthermore, since the thickness is less than 1 mm, only the contact point with the wet paper is improved in surface properties and moisture absorption protection without breaking the elastic behavior of the substrate. In addition, by subjecting the surface layer 21 to surface polishing, the surface properties of the base 2 are enhanced, and the adhesion between the base 2 and the buffer resin material 3 is improved. Further, the back surface layer 22 serving as a running surface
Since the backside resin layer 5 is formed by applying a wear-resistant resin to the front surface of the papermaking material, the wear resistance is improved, and the life of the papermaking composite fabric is extended.

(2) Example 2 FIG. 2 shows a composite fabric 1B for papermaking of Example 2.
The configuration of the papermaking composite fabric 1B of the second embodiment is such that, in addition to the configuration of the papermaking composite fabric of the first embodiment, the base 2 and the buffer resin material 3 are reinforced with screws 6 at regular intervals. The screw 6 is substantially made of the buffer resin material 3.
Since it is buried in the paper, it does not hit the paper side, preventing the surface from being damaged. Further, the reinforcing screw 6 is made of polyester, and deteriorates during use, becomes powdery, and falls naturally. Thereby, it can be used in a stable state over the entire use period without causing any problem during use.

(3) Embodiment 3 FIG. 3 shows a papermaking composite fabric 1C of Embodiment 3.
The composite papermaking fabric 1C according to the third embodiment includes a base 2 and a buffer resin material 3 as in the first and second embodiments. Are bonded by an adhesive. The base 2 is a flexible woven fabric for a press part, and is a weft double warp 1 in which the surface layer side weft 212 constituting the surface layer and the back layer side weft 222 constituting the back layer are woven with the warp 23. It is composed of a heavy two-layer fabric. The nylon bat layer 7 is entangled in the gaps between the fabrics constituting the base 2 by needling. By providing such a bat layer 7, fibers are implanted, the structure of the base is stabilized, and the contact area between the base and the resin material for buffering is increased. This has the effect of realizing the conversion.

It should be noted that the present invention is not limited to the specific embodiments described above, but can be variously modified according to the purpose and application.

[0027]

According to the composite fabric for papermaking of the present invention, compared to the conventional case where a resin having a high degree of polymerization is impregnated or coated in a liquid state, it is possible to use a special material and equipment without using any special materials and equipment. It is excellent in cushioning and fatigue resistance, and it can be used as an area with excellent surface properties and moisture absorption protection only at the point of contact with the wet paper without destroying the elastic behavior of the base. Applicable to various parts.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a papermaking fabric of Example 1.

FIG. 2 is a schematic cross-sectional view of the papermaking fabric of Example 2.

FIG. 3 is a schematic longitudinal sectional view of a papermaking fabric of Example 3.

FIG. 4 is an enlarged view of a dotted square portion in FIG.

[Explanation of symbols]

1A, 1B, 1C; Composite fabric for papermaking, 2; Substrate, 21; Surface layer, 211; Surface layer side warp, 212; Surface layer side weft, 22; Back layer, 221; Back layer side warp, 2
22; back layer side weft, 23; warp, 3; buffer resin material, 4; binding yarn, 5; back resin layer, 6; screw, 7; bat layer.

Claims (16)

[Claims] 1. A papermaking composite comprising a substrate and a buffer resin material provided in contact with the surface of the substrate, wherein the substrate and the buffer resin material are integrated by bonding. fabric. 2. The papermaking composite fabric according to claim 1, wherein the recovery rate of the thickness of the substrate when the substrate is depressurized after being pressurized at 50 kg / cm ² for 10 seconds is 70% or more. 3. The papermaking composite fabric according to claim 1, wherein the substrate is a woven fabric having at least two layers. 4. The papermaking composite fabric according to claim 1, wherein the substrate has a surface polished, and a surface polished amount is 30 μm or more and less than 70 μm. 5. The papermaking composite fabric according to claim 1, wherein a wear-resistant resin is applied or impregnated on the back side of said base. 6. The papermaking composite fabric according to claim 1, wherein said buffer resin material is a sheet or mat having a thickness of less than 1 mm. 7. The papermaking composite fabric according to claim 1, wherein said buffer resin material is composed of urethane or elastomer. 8. The papermaking composite fabric according to claim 1, wherein said buffer resin material is a porous resin material. 9. The water permeability of the buffer resin material is 5 kg.
/ Paper composite fabric according to any one of claims 1 to 8 water pressure cm ² in at 1 cc / sec / cm ² or less. 10. The papermaking composite fabric according to claim 1, wherein said base material and said buffer resin material are adhered by a nylon resin, a urethane resin or a double-sided tape. 11. The papermaking composite fabric according to claim 10, wherein the double-sided tape has a cushioning property and has a thickness of less than 0.2 mm. 12. The papermaking composite fabric according to claim 1, wherein said substrate and said buffer resin material are sewn and adhered. 13. The papermaking composite fabric according to claim 1, wherein said base and said buffering resin material are adhered with a resin screw. 14. The papermaking composite fabric according to claim 1, wherein a bat layer made of synthetic fibers is interposed between said base and said buffer resin material. 15. The air permeability is 5 cc / sec as a value measured by a non-pressurized Frazier-type tester (JIS L1004).
The papermaking composite fabric according to any one of claims 1 to 14, which has a c / cm ² or less. 16. The papermaking composite fabric according to claim 1, which is used for a wet paper web transport belt.