JP2528747Y2 - Dryer canvas 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 papermaking dryer canvas whose air permeability is adjusted.

[0002]

2. Description of the Related Art In general, the profile of the moisture content of paper in a dryer part of a paper machine tends to be middle-to-high in the width direction, and both ends are apt to be over-dried. This overdrying is likely to occur because there are no obstacles to the airflow at both ends and there is an upward airflow accompanying the exhaust, so that there is a lot of contact with air with little moisture.

[0003] Therefore, as a countermeasure for overdrying of the both ends, when manufacturing a dryer felt, it is necessary to use
No. 079, a method in which the weight per unit of the fibrous web to be laminated on the base fabric is varied in the width direction, and needle punching is performed.
As described in JP-A-6614, a method has been proposed in which a synthetic resin film is melt-fixed to the surfaces of both ends of a dryer felt to reduce voids between fibers at both ends.

[0004]

However, the air permeability of the dryer felt is changed by changing the weight in the width direction of the fibrous web laminated on the base fabric as in the method described in Japanese Utility Model Application Laid-Open No. 48-5079. Is very effective if the economics such as the number of steps, labor and time are ignored, but in practice, a density gradient of the fiber web is formed in the width direction of the dryer felt, and this density gradient is It is extremely difficult to maintain a uniform lengthwise direction and the cost is significantly increased.

A method of adjusting the air permeability by reducing the fiber space at both ends of the completed dryer felt by melting a synthetic resin described in Japanese Utility Model Laid-Open No. 55-46614 is described in Japanese Utility Model Laid-Open No. 48-5079. Although it is simpler than the method that is seen and is also advantageous in terms of cost,
Applying a certain amount and a certain amount at a certain position requires a high level of skill or equipment, and the applied resin may peel off during use and transfer to paper or a roller. The present invention has been provided for the purpose of solving such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention can cope with the tendency of the paper to have a high or low moisture content profile in a paper machine, and can cope with the overdrying tendency of both ears. That is, the present invention comprises a woven fabric in which a splittable conjugate fiber having a certain polymer as a first component and another polymer as a second component is used for part or all of a warp yarn and / or a weft yarn. A part or all of the first and second components of the splittable conjugate fiber are separated from each other, dispersed and arranged, and filled between the weaves of the woven fabric. The papermaking characterized in that the ears of the woven fabric are separated from the first component and the second component of the splittable conjugate fiber by high-pressure water flow treatment or needle punching treatment, are dispersed and filled, and are filled between the weaves. It is a dryer canvas.

In order to cope with the tendency of the water content profile of the paper to be medium or high, for example, when the fabric is subjected to a high pressure treatment toward the end during the water flow treatment and a low pressure treatment toward the center, the air permeability is adjusted because the degree of peeling is different. Dryer canvas for papermaking. Further, in order to cope with the tendency of overdrying at both ends, for example, as shown in FIG. 5, a papermaking dryer canvas in which only the ears of the fabric are subjected to high-pressure water flow treatment and the air permeability of only the ears is adjusted may be employed. .

[0008]

The canvas woven from the splittable conjugate fiber containing the first component and the second component has a warp yarn and / or a weft yarn at a portion treated by high-pressure water flow treatment or needle punching treatment. The first component and the second component of the splittable conjugate fiber, which are the constituent fibers of the above, are separated from each other and loosened apart, and are filled between the canvas fabrics so that the air permeability is adjusted. Become.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIGS. 1 and 3 are organization diagrams before high-pressure water flow treatment in Embodiments 1 and 2, respectively. FIGS. FIG. 9 is a structural diagram after high-pressure water flow treatment in Example 2. Tables 1 and 2 show the specifications of the first and second embodiments. FIG.
FIG. 3 is a perspective view schematically showing a manufacturing process of the papermaking dryer canvas of the present invention. A dryer canvas (1) woven based on the specifications of Examples 1 and 2 was passed through a high-pressure water flow treatment device (7) to process only the ears. Water flow pressure is 50K
g / cm ² , and both sides of the canvas were subjected to high-pressure water flow treatment.

[Example 1]

[Table 1]

[Embodiment 2]

[Table 2]

[0012]

[Effects of the Invention] The dryer canvas for papermaking of the present invention is inexpensive because it does not require the use of a fiber web lamination with only a canvas base fabric, and the dryer canvas in the portion of paper that is easily overdried is a component of the splittable composite fiber. Are separated from each other and loosened and filled between the canvas weaves, so that the air permeability is adjusted and reduced to prevent overdrying. As a result, a uniform paper moisture content profile is obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a first embodiment of the present invention before high-pressure water flow treatment.

FIG. 2 is a structural diagram of the first embodiment of the present invention after high-pressure water flow treatment.

FIG. 3 is a structural diagram of a second embodiment of the present invention before high-pressure water flow treatment.

FIG. 4 is a structural diagram of the second embodiment of the present invention after high-pressure water flow treatment.

FIG. 5 is a perspective view showing an outline of a manufacturing process of the dryer canvas of the present invention.

[Explanation of symbols]

1: Dry canvas, 2: Vertical yarn, 3: Vertical core yarn,
4: splittable composite fiber bundle, 5: splittable composite fiber, 6: monofilament weft, 7: high-pressure water flow treatment device

Claims (2)

(57) [Scope of request for utility model registration] 1. A splittable conjugate fiber comprising a certain polymer as a first component and another polymer as a second component comprises a warp yarn and / or
Or a woven fabric used for a part or all of the weft yarn, and a first or a part of the splittable conjugate fiber of the woven fabric.
A papermaking dryer canvas, wherein the component and the second component are separated from each other, dispersed and arranged, and filled between the textures of the woven fabric. 2. The ear part of the woven fabric, wherein the first component and the second component of the splittable conjugate fiber are separated by high-pressure water flow treatment or needle punching treatment.
Dryer canvas for papermaking as described