JP3045895B2 - Felt for papermaking - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a felt for papermaking, and more particularly to a felt for papermaking which is pressed by a press section of a papermaking machine to squeeze moisture from a wet paper sheet.

[0002]

2. Description of the Related Art Conventionally, a papermaking felt which is in close contact with a wet paper sheet passing between a pair of upper and lower rolls of a paper machine and serves to squeeze moisture from the wet paper sheet is formed on both sides of a base fabric woven endlessly. Or, on one side, a fiber web needled and integrated, or the start and end of a base fabric woven in an end shape are joined and processed into an endless shape. The one in which the web is needled and integrated is used.

[0003]

However, when fabricating a felt for papermaking individually with dimensions adapted to a paper machine, the dimensions must be set from the time of weaving the base fabric, and the production period is lengthened. was there.

SUMMARY OF THE INVENTION An object of the present invention is to solve such a conventional problem by converting an endless base fabric woven with a simple structure into an endless base cloth having an arbitrary size. It can be processed into a fabric structure in a short time, and eliminates the difference in thickness between the joint between the start and end of the base fabric and other portions, and has a uniform thickness and excellent strength. An object of the present invention is to provide a quality felt for papermaking.

[0005]

In order to achieve this object, the present invention is to form an endless base fabric structure by continuously winding and laminating a base fabric woven with a simple structure in an annular shape. The present invention also provides a papermaking felt characterized in that a fiber web is needled and integrated on both sides or one side of the base fabric structure.

[0006] In the base fabric, at least the lengthwise yarn is a monofilament or a multifilament,
In addition, the present invention provides a felt for papermaking, wherein the diameter of the yarn in the width direction is made smaller than the diameter of the yarn in the height direction, and the interval between the yarns in the length direction is 2 to 5 times the diameter. Things.

Further, the present invention provides a papermaking felt characterized in that yarns in the width direction at both ends of the base fabric are removed.

[0008]

According to the present invention, as a base fabric constituting a papermaking felt, an endless base fabric structure is formed by continuously winding and laminating one long base fabric woven with a simple structure in a ring shape. In order to make the felt, the length of the papermaking felt can be freely and accurately determined at the time of winding, and the base fabric structure can be manufactured in a short time.

Further, since the base fabric is continuously wound and laminated in an annular shape, the starting end and the end of the base fabric can be easily located on the same line in the width direction, and the thickness of the joint portion and the other portion are made equal. It is easy.

[0010] The base fabric can maintain high strength in the length direction because at least the yarn in the length direction is made of monofilament or multifilament. In addition, by making the diameter of the yarn in the width direction thinner than the diameter of the yarn in the height direction, and by setting the interval between the yarns in the height direction to 2 to 5 times the diameter of the yarn, the wound laminated annular When the web is overlapped and needling on the base fabric structure, the lengthwise yarns of the wound base fabric can be inserted into the concave portions formed between the lengthwise yarns of the base fabric. Therefore, the adhesion between the laminated base fabrics can be improved, and the strength of the papermaking felt can be improved by reducing the thickness of the base fabric structure.

Further, when the lengthwise yarns of the base fabric are composed of incompressible filaments, and the lengthwise yarns of the laminated base fabric have a structure in which they are mutually recessed,
Stable water conductivity can be maintained without flattening due to pressurization in the press section of the paper machine. Further, both ends of the base cloth, that is, the starting end and the end of the base cloth are overlapped over the same line in the width direction, and the yarn in the width direction of the overlap portion is removed to form a joint. Step can be eliminated.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic overall configuration diagram of a papermaking felt according to an embodiment of the present invention, FIG. 2 is a partially enlarged cross-sectional view of FIG. 1, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

The papermaking felt 20 according to this embodiment includes:
As shown in FIGS. 1 to 3, a nylon monofilament having a diameter of 0.33 mmφ (880 d) is used as the length direction yarn 12, and a diameter = 0.20 mm as the width direction yarn 11.
Using a nylon monofilament of mmφ (330d), the density of the lengthwise yarn 12 is 8 yarns / cm, and the widthwise yarn 1
A base fabric 1 having a long and simple structure (for example, plain weave) having a density of 5 fibers / cm is used.

The base cloth 1 is formed by continuously forming a single long piece of cloth woven in advance into an annular shape having a desired size.
Circumferential lamination. In this case, it is easy to adjust the start end 13 and the end 14 of the base cloth so that they are located on the same line 15 in the width direction. Therefore, both the joining portion and other portions are configured as the endless base fabric structure 10 having a uniform thickness at all times. Note that FIGS. 1 and 2 have steps so that they are easy to understand in drawing, but no steps actually occur.

As described above, since the base fabric structure 10 is formed by winding and laminating the base fabric 1 having a long and simple structure (for example, plain weave), the size of the papermaking felt 20 as the final product is determined. Regardless of the length, the size is easily determined.
Therefore, there is an advantage that it can be manufactured in a shorter time than when weaving a base fabric made of multiple weaves using a heavy loom.

In constructing the base fabric structure 10, the starting end 13 of the base fabric 1 and the end end 14 of the base fabric may be reinforced by overlapping in a limited range. In this case, when the yarn in the width direction of the overlap portions 13a and 14a is removed as shown by a two-dot chain line in FIG. 2, the starting end 13 and the end 14 of the base fabric are positioned on the same line 15 in the width direction as described above. In the same way, the whole has a uniform thickness.

As shown in FIG. 3, the distance L between the lengthwise yarn 12 of the base cloth 1 and the adjacent lengthwise yarn 12 is 2 to 5 times the diameter R of the yarn 12. Have been.
This is because when the base cloth 1 is wound, the yarn 1 in the length direction of the base cloth
This is because it is possible to provide a structure in which the length-direction yarn 12 of the base fabric to be wound and laminated enters the concave portion 16 formed between the base material 2 and the height-direction yarn 12. That is, by improving the adhesion between the laminated base fabrics 1, excellent strength can be obtained, and further, elongation in the height direction can be suppressed, and dimensional accuracy can be improved. Further, the base fabric structure 10 formed by laminating several layers of the base fabric 1 can be made relatively thin.

The distance L between the yarns 12 in the length direction is the same as that of the yarn 1
If the diameter is less than twice the diameter R of 2, the adhesion between the base fabrics cannot be obtained, and the base fabric structure becomes unstable. Conversely, if the diameter exceeds 5 times the diameter, the flatness of the base fabric structure becomes large. And stability is reduced, which is not preferable.

On both sides (inner peripheral surface and outer peripheral surface) of the base fabric structure 10, the fiber web 2 is integrated by needling, and the paper fabric felt is combined with the base fabric structure 10 and the fiber web 2. 20. This papermaking felt 20
Since the base fabric structure 10 requiring the longest time in the manufacturing process can be manufactured easily and in a short time, the delivery time can be reduced to about 1/4 as compared with the conventional papermaking felt.

Next, the papermaking felt 20 according to the present embodiment is described.
Was installed at a predetermined position of the paper machine, and the papermaking was performed.
Vibration did not occur in the paper machine during papermaking, and the paper sheet thus produced had good quality without any marks.

Although not shown, a single-woven endless base fabric is formed as the papermaking felt 20 according to the present invention, and an endless long base fabric is wound and laminated along the inside thereof. The base fabric structure 10 may be manufactured, and the fiber web 2 may be needled on both surfaces thereof to be integrated.

In this embodiment, the base fabric structure 10 in which the base fabric 1 is wound four times is used. However, the present invention is not limited to this. May be determined arbitrarily. Although not shown, the fiber web 2 may be needling-integrated only on one side of the base fabric structure 10 in some cases.

In this embodiment, nylon monofilaments are used as the lengthwise yarns 12 and the widthwise yarns 11 of the base fabric. However, the present invention is not limited to this, and monofilaments or multifilaments such as polyester and olefin are used. It is also possible.

[0024]

As described above, the papermaking felt according to the present invention is an endless base fabric structure obtained by continuously winding and laminating one long base fabric woven with a simple structure in an annular shape. Is formed, and on both sides or one side thereof, the fiber web is needled to have an integrated structure, so that the dimensions of the papermaking felt can be arbitrarily determined at the time of winding, and its dimensional accuracy can be determined. Also improve. That is, a base fabric structure having a free length can be manufactured in a short time.

Moreover, since the structure is such that one long base fabric woven in advance is continuously wound in a ring shape, the starting end and the end of the base fabric can be easily positioned on the same line in the width direction, and the starting end of the base fabric can be easily obtained. Since the start end and the end do not overlap at the junction between the end and the end, it is easy to make the thickness of the junction and the other portion the same. As a result, it is possible to provide a high-quality, long-life papermaking felt free of vibrations and marks of the papermaking machine in a short delivery time.

[0026] Further, the base fabric can further increase the strength in the length direction when at least the yarn in the length direction is made of a monofilament or a multifilament, and can further increase the diameter of the yarn in the width direction with respect to the diameter of the yarn in the length direction. If the distance between the length-direction yarns is set to 2 to 5 times the diameter thereof, the length-direction yarn of the laminated base fabric is inserted into the recess formed between the length-direction yarns of the base fabric. You can get in. Therefore, the adhesion between the laminated base fabrics can be improved, and the thickness of the base fabric structure can be reduced.

Further, if the both ends of the base cloth are overlapped and the yarn in the width direction corresponding to the overlap is removed, no step is formed at the joining portion between the start end and the end of the base cloth. It is possible to prevent the vibration of the paper machine and strengthen the joint.

[Brief description of the drawings]

FIG. 1 is a schematic overall configuration diagram of a papermaking felt according to an embodiment of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base cloth 2 fiber web 10 base cloth structure 11 width direction thread 12 length direction thread 13 start end of base cloth 14 end of base cloth 15 collinear line where start end and end of base cloth are joined 16 recess 20 felt for papermaking

Claims (3)

(57) [Claims] An endless base fabric structure is formed by continuously winding and laminating a base fabric woven in a simple structure in an annular shape, and a fiber web is kneaded on both surfaces or one surface of the base fabric structure. Felt for papermaking characterized by being integrated by ring. 2. The base fabric according to claim 1, wherein at least the length direction yarn is a monofilament or multifilament, and the width direction yarn diameter is smaller than the length direction yarn diameter.
2. The papermaking felt according to claim 1, wherein the distance between the yarns in the length direction is 2 to 5 times the diameter. 3. The papermaking felt according to claim 1, wherein widthwise yarns at both ends of the base fabric are removed.