JP4454018B2 - Dimple foil blade - Google Patents

Description

  The present invention relates to a foil blade for efficiently dewatering a stock released on a wire in a forming part of a paper machine.

  Conventionally, a foil blade has been used in the forming part of a paper machine to efficiently dehydrate the stock. The foil blade is used by being pressed against the running surface side of the papermaking wire hung between the rolls, and has an effect of efficiently dehydrating the moisture of the paper material through the wire. The foil blade has an elongated shape extending in the width direction of the wire, scrapes off moisture in the wire, and at the same time creates a vacuum state by contact with the traveling wire and efficiently dehydrates it. As the structure of the foil blade, there are a structure in which the entire wire contact surface is parallel, and a structure in which an inclined slope surface is easy to draw a vacuum state. In addition, there is one composed of a parallel surface supporting the wire and an inclined surface having an angle. The foil blades are arranged at a relatively initial position of the forming part, and in particular, a plurality of foil blades are often arranged side by side immediately after the paper material is discharged from the head box. Since the back side of the wire is in a vacuum state when the wire carrying the stock passes through the foil blade, the moisture of the stock on the wire is sucked and dehydrated. The fiber orientation is roughly determined when some of the moisture in the stock is removed and a sheet is formed. Therefore, it is necessary to adjust appropriately so that a uniform sheet | seat may be formed here. In order to form a uniform paper, there are many adjustment factors such as raw material concentration, raw material release amount, wire design, wire speed, foil installation position, number of installations, etc. Foil design is also an important adjustment factor .

Conventionally, foil blades have been developed for efficiently dewatering paper stock and solving uneven formation, paper thickness, and the like. For example, there is a foil blade provided with a plurality of notches in the width direction on the wire contact surface, such as a foil blade disclosed in Japanese Utility Model Laid-Open No. 64-2098. This foil blade has a negative pressure greater at the notch than at other parts, so when it passes through the notch, the dehydration of the material on the wire is promoted, the thickness of the sheet at that part decreases, and the width direction of the sheet As a result, irregularities are formed. And it is described that the flow of the horizontal direction which a fiber moves to the recessed part from a convex part of a sheet | seat is repeated by passing several foil, and a fiber can be disperse | distributed uniformly as a whole. However, as shown in FIG. 1, this notched foil has one notch extending to the end in the longitudinal direction of the foil, so that the vacuum state continues on the back side of the wire until it passes through one foil. The unevenness formed in the above may not be dispersed, resulting in a non-uniform sheet, or a sheet having a lot of longitudinally oriented fibers. No matter how many foils are arranged with the notch being shifted, the orientation of the fibers remains in a vertical arrangement because there is a continuous vacuum in one place with respect to the traveling wire. The flow of fibers into the sheet is not sufficient, and as a result, the sheet thickness is uneven and the sheet is strongly longitudinally oriented. This paper has poor texture and has low smoothness and paper strength.
Japanese Utility Model Publication No. 64-2098

  In view of the above-mentioned problems, the present invention is arranged such that a plurality of non-penetrating dimples are arranged at random on the wire contact surface of the foil blade for dewatering the paper, so that the formation of the paper, smoothness, The present invention aims to provide a foil blade having excellent paper strength and the like.

The present invention
“1. A dimple formed by randomly arranging a plurality of dimples that do not penetrate the plate on the contact surface of a foil blade for dewatering a stock used in a forming part of a paper machine with a paper making wire. Foil blade.
2. The dimple foil blade according to item 1, wherein a plurality of dimples that do not penetrate the blade are arranged in a staggered manner with the center point shifted.
3. The dimple foil blade according to item 1 or 2, wherein the dimple has a hemispherical shape, a truncated cone shape, or a truncated pyramid shape in which a cross-sectional area gradually decreases in the depth direction.
4). 4. The dimple foil blade according to any one of items 1 to 3, wherein a plurality of dimples have the same shape and / or size.
5). 4. The dimple foil blade according to any one of items 1 to 3, wherein a plurality of dimples have different shapes and / or sizes.
6). The dimple foil blade according to any one of claims 1 to 5, wherein a plurality of the dimple arrangements arranged at random include at least a part in which columns and / or rows are arranged in an alignment. .
7). Hemispherical dimples adjacent arranged in the width direction of the foil (B) of the truncated pyramid shape of a triangle having an apex and in the length direction in (C), most Hirohaba line B of the width direction passing through the center of the dimple (B) contact b the intersection of the opening line of the dimples a in the end (B), and b', the b, tangential B'extending longitudinally relative b', provided B '', the dimples (B the dimples (C) top Hirohaba line C of the corner point c which is the base of the triangle extending in the width direction to form the next to), and c', the point c, the c'the perpendicular length direction The extending line is C ′, C ″, and the end of the widest line A in the width direction passing through the center of the hemispherical dimple (A) adjacent in the length direction between the dimples (B) and (C). when the intersection of the opening line of the dimple (a) Proximity a, and a'there is, the adjacent tangent B'and tangent C'is the dimple (a) most Width line A on a cross or the point a, through the a', dimples foil blade according to any one of claims 1 to 6.
8). Hemispherical adjacent arranged in the width direction of the foil dimple (E) of the truncated pyramid shape of a triangle having an apex and in the length direction in (F), the longest line E longitudinal passing through the center of the dimple (E) Proximity to the intersection of the opening line of the dimples a in the end (E) e, and e', the e, tangent E'extending in the width direction, E '' strings provided for e', said dimples (E the dimple (F) the length direction of the longest line F end point f to form the next to), and f', the point f, the tangent F'extending in the width direction relative f', F ''And the end of the longest line D in the length direction passing through the center of the hemispherical dimples (D) adjacent in the length direction between the dimples (E) and (F ). Proximity to the intersection of the opening line of d, and d', dimples (D) near the side of the tangent E', either or both the dimples, the F'( Longest line D cross or the point d, through d', dimples foil blade according to any one of claims 1 to 7).
9. The dimple foil blade according to any one of 1 to 8, wherein the wire contact surface of the foil blade has a sloped surface inclined in the traveling direction of the wire. "
About.

  The foil blade of the present invention in which a plurality of non-penetrating dimples are randomly arranged on the sloped surface of the foil blade is easy to disperse the stock on the running wire, and the fibers are oriented vertically and horizontally. In addition, there is an effect that paper having excellent paper strength and the like can be formed.

  In the dimple foil blade of the present invention, a plurality of non-penetrating dimples are arranged at random on the contact surface with the papermaking wire with the center point shifted. In general foils, there is little disturbance of the water flow to the extent that the fiber orientation changes when passing through the foil, and the wet paper sheet has a strong vertical orientation, but in the dimple foil blade of the present invention, the wire is not Passing through these dimples causes turbulence, which causes the paper stock on the wire to re-diffusion, resulting in a fiber-dispersed sheet, eliminating the occurrence of water stripes, erasing the wire mark, There is an effect of improving the uniformity and paper strength.

In the foil blade of the present invention, a plurality of dimples that do not penetrate the plate may be randomly arranged on the wire contact surface with the center point shifted, and the parallel surface that supports the wire and the inclined surface that induces the induced vacuum are necessarily provided. It does not have to be a structure. The dimple foil of the present invention has a sufficient dehydrating effect even if it is composed of all parallel surfaces. Of course, it may be a foil having only a gradient surface or a foil having both parallel and gradient surfaces. The foil slope surface is a structure that easily induces a vacuum state, but each dimple placed on the wire contact surface side is also in a vacuum state, and when the wire passes through the dimple, a turbulent flow of water is generated while dehydrating. Also, fiber redispersion occurs.
In the case of a foil having a gradient surface, the gradient surface is inclined slightly downward with respect to the parallel surface, and the angle is generally about 0 ° to 4 °, and rough negative pressure can be adjusted depending on the angle. . What is necessary is just to select an angle suitably with wire speed, the arrangement position of foil, a raw material, etc. Then, the plurality of non-penetrating dimples are displaced at random on the wire contact surface. The arrangement interval of the dimples in the width direction and the interval between the columns in the length direction can be appropriately selected, and the shape, size, depth, etc. of the dimples are not particularly limited. Dimples having the same shape and the same size may be arranged as a whole, or dimples having different shapes and sizes may be arranged. The random arrangement here means an arrangement in which the center point of the dimple is shifted. Also included are those in which the centers of the dimples are shifted by half, shifted by 1/3, or distributed in a distributed manner without any regularity.

  Further, as a preferred embodiment, a staggered arrangement with regularity may be used. When the dimple spacing is relatively narrow, fiber dispersion can be generated uniformly over the entire width of the wire. For example, in the first row of dimples only, the dimples are arranged with gaps. Therefore, when the paper fabric on which the raw material is placed passes over the foil, the raw material is dispersed in the portion where the dimple is present, and the dimple exists. The non-dispersed portion is not dispersed, resulting in non-uniform paper. The portion where the first row of dimples did not pass may be arranged so that the second row and subsequent dimples pass through. In this way, it is preferable that the dimples are displaced and arranged in a plurality of rows at intervals such that the entire wire passes through any of the dimples.

  Further, the shape of the dimple is preferably a hemisphere whose cross-sectional area decreases in the depth direction, a truncated cone shape having a bottom surface, a truncated pyramid shape, or the like. In addition, there are a cylindrical shape, a prismatic shape, and the like. In the case of a hemispherical shape, a truncated cone shape, and a truncated pyramid shape whose cross-sectional area gradually decreases, a pulse is generated when water flows along the wall of the dimple in use, whereby the fibers are redispersed. The hemispherical shape, truncated cone shape having a bottom surface, truncated pyramid shape, and the like, from the dimple opening without causing the water flow to collide with the dimple wall vigorously, compared to the cylindrical or prismatic shape in which the cross-sectional area of the dimple does not change Since a continuous flow occurs from the bottom to the opening, an improvement in the formation of the sheet can be expected. Other shapes may be used, and two hemispheres of different sizes may be stacked in the depth direction. Further, the opening shape of the dimple is preferably a curved shape, such as a shape combining a circle, an ellipse, or a curve, but may be a polygonal shape formed from other straight lines or curves. If the dimple has a shape that receives the water flow vertically, the water flow may stagnate in the dimple and fiber dispersion is difficult to occur. However, this is not the case if it is not perpendicular to the flow. For example, even if the opening shape is a polygon such as a square, instead of placing one side perpendicular to the direction of wire travel, place one side at the top so that the two sides are diagonal. Then, like the circular shape, the dispersion of the raw materials is likely to occur, which is preferable.

  As a specific arrangement of the dimples, for example, the shape of the dimple is a hemispherical shape in which the cross-sectional area gradually decreases in the depth direction. The diameter of the opening of the hemisphere was 10 mm, and a plurality of them were sequentially arranged in a line in the width direction at intervals of 2 mm. On the other hand, the center of the circle was shifted by 6 mm in the next row, and 10 mm diameter hemispherical dimples were similarly arranged at intervals of 2 mm. The interval between the first row and the second row was 0 mm, and a plurality of rows were sequentially arranged. Then, the columns were arranged at intervals of 4 mm without shifting the hemispherical dimples having a radius of 12 mm at the end in the width direction of the foil. As described above, a portion arranged in an aligned manner without shifting the dimples may be put in the staggered arrangement, or dimples having different diameters may be arranged. Of course, the dimple opening area gradually decreases or increases in the flow direction, and large dimples and small dimples may be alternately arranged. Those having different dimple shapes may be arranged adjacent to each other. The arrangement interval and the number of arrangement of the dimples can be appropriately selected depending on the purpose and application.

The material of the foil blade is preferably a material that does not damage the wire and is not easily worn because it serves to scrape moisture of the raw material by contacting with a papermaking wire that runs at high speed. Generally, polymer materials such as polyethylene and polyurethane, and other ceramics (alumina, silicon carbide) and the like are used, but the material of the foil blade of the present invention is not limited. The selection should be made taking into account the ease of dimple processing.
The wire contact surface side of the foil of the present invention includes one that is a parallel surface, one that is a gradient surface, one that is composed of a parallel surface and a gradient surface, and the anti-wire contact surface side is at a designated place A structure that can be slid and attached to a dedicated jig is preferable. In addition, any structure may be used as long as it can be fixed during use and can be easily replaced and removed. For dimple processing, a drilling machine capable of processing into a desired shape and size may be used, and other materials that are difficult to drill may be molded. Further, surface polishing or the like may be performed after the dimple formation. When the size of the dimple is hemispherical, a diameter of 6 mm and an opening area of about 28.3 cm ² are preferable because of good fiber redispersibility.

  The present invention will be specifically described with reference to the drawings.

Example 1
FIG. 1 is a perspective view of one embodiment of a dimple foil blade of the present invention. FIG. 2 is a cross-sectional view taken along the line AB of FIG. FIG. 3 is a part of an image view seen from above showing the flow of water when the raw material passes over the dimple foil. FIG. 4 is a top view showing the positional relationship of a part of the dimples. FIG. 5 is another top view showing the positional relationship of a part of the dimples. FIGS. 6, 7, 8 and 9 are other embodiments showing the arrangement of the dimples of the present invention provided on the blade.
The dimple foil blade 1 of the present invention comprises a parallel surface 2 that supports the wire on the side of the foil blade that makes contact with the paper-making wire, and a gradient surface 3 that induces induced vacuum, and a plurality of dimples 4 that do not penetrate the gradient surface. They are arranged in a staggered pattern. Of course, it may be formed with only a parallel surface without a gradient surface, or only with a gradient surface, or with a random dimple arrangement that is not staggered. Although not shown, the wire runs on the foil blade and runs in the direction of the white arrow. The wire usually passes through the parallel plane and the gradient plane in this order. The arrow direction extending to the wire travel side is called the foil length direction, and the arrow direction crossing the wire travel side is called the foil width direction.
In the dimple foil blade of the present invention, the centers of a plurality of dimples are shifted and randomly arranged, and when the wire passes through the dimple, a local vacuum is generated and turbulence is generated. As a result, the stock on the wire causes re-diffusion and becomes a sheet in which the fibers are dispersed. In other words, since the fibers are dispersed in various directions, the light and shade and the thickness of the paper are less likely to occur due to the bias of the raw materials. This can be clearly seen from the top view of FIG. 3 in FIG. 3 is an arrow indicating the direction of water flow before passing through the dimples. When passing through the dimples, the flow of water changes along the outer wall of the dimples and becomes as shown in FIG. As a result, the fibers on the fabric are diffused. If there are no dimples, the water flow goes straight mainly in one direction and fiber dispersion hardly occurs.

  In FIGS. 1 to 3, the shape of the dimple is a hemisphere having a circular opening, but it may be a cylinder, a prism, a cone, a pyramid, or the like. Since the shape of the dimple is not limited, it may be a shape in which hemispheres having different diameters overlap each other in the depth direction. Of course, the opening shape may be a triangular pyramid shape as shown in FIGS. 4 and 5 (C) and (F). Then, as shown in FIG. 8, dimples having different shapes may be arranged on one foil, and the size can be appropriately selected. The arrangement may be any random shape with the center shifted, and the random arrangement may include a portion that is aligned and arranged without shifting the dimples. For example, among the plurality of dimples arranged in a staggered manner as shown in FIG. 6, dimples having different diameters are arranged in the vertical direction at the widthwise ends of the foil. Further, as shown in FIG. 7, the center of the dimple may be shifted little by little instead of being staggered. And even if the dimples of different shapes are mixedly arranged as shown in FIG. 8, the diameter may gradually change as shown in FIG.

Preferably, the arrangement intervals of the dimples are relatively narrow. Since only the dimples in the first row are arranged with a gap, when the papermaking fabric on which the raw material is placed passes over the foil, the fibers are dispersed in the portion where the dimples are present and there is no dimple. Since it is not dispersed in the part, it becomes non-uniform paper. A preferable arrangement is an interval arrangement as shown in FIG. 4, and in the dimples (B) and (C) arranged adjacent to each other in the width direction of the foil, the end of the widest line B in the width direction of the dimple (B) is marked. b, b ′, tangent lines B ′, B ″ extending in the length direction are provided, and the end of the widest line C in the width direction of the dimple (C) adjacent to the dimple (B) is dotted. c ′ and c ′, and C ′ and C ″ are provided as tangent lines extending in the length direction with respect to them, and the width direction of the dimple (A) in the adjacent row between the dimples (B) and (C) is provided. When the ends of the wide line A are points a and a ′, the adjacent tangent line B ′ and tangent line C ′ intersect or contact the widest line A of the dimple (A). In FIG. 4, the tangent lines B ′ and C ′ intersect with the wide line again, indicating that the distance between adjacent dimples is short. With such a foil, the dimples are passed through the full width of the wire, so that fiber re-dispersion occurs uniformly over the full width of the wire.
The same is true for the columns. In the dimples (E) and (F) arranged adjacent to each other in the width direction of the foil as shown in FIG. 5, the ends of the longest line E in the length direction of the dimple (E) are defined as points e and e ′. The tangent lines E ′ and E ″ extending in the width direction are provided, and the ends of the longest line F in the length direction of the dimple (F) adjacent to the dimple (E) are defined as points f and f ′, and the width direction with respect to them. Tangent lines F ′ and F ″ extending to the end of the longest line D in the length direction of the dimples (D) in the adjacent row between the dimples (E) and (F) are defined as points d and d ′, The tangent lines D ′ and D ″ extending in the width direction are provided, and one or both of the tangent lines E ′ and F ′ on the side close to the tangent line D intersect or contact the longest line D of the dimple (D). 5 shows that the tangent line E ′ intersects with the longest line D, and the dimples are close to each other. In to confusion the flow direction of the water flow variance mutually influence caused by the dimples, the effect of the fibers are dispersed in various directions.

  The dimple foil blade of the present invention is effectively used for papermaking.

It is a perspective view of the dimple foil blade of this invention. It is a cross-sectional view of FIG. It is the image figure seen from the upper side which showed the flow of water when a raw material passes on a dimple foil. It is the top view which showed the arrangement | positioning relationship of the dimple. It is the top view which showed the other arrangement | positioning relationship of the dimple. It is the top view which showed arrangement | positioning of the dimple of this invention. It is the other top view which showed arrangement | positioning of the dimple of this invention. It is the other top view which showed arrangement | positioning of the dimple of this invention. It is the other top view which showed arrangement | positioning of the dimple of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dimple foil blade 2 Parallel surface 3 Gradient surface 4 Dimple 5 Foil attachment part 6 Water flow direction before dimple passage 7 Water flow direction after dimple passage A Dimple (A) widest line B Dimple (B) widest line C Dimple (C) The widest line D of the dimple (D) The longest line E of the dimple (D) The longest line of the dimple (E) F The longest line of the dimple (F) B 'The tangent of the end b of the end B ′ Tangent line E ′ End tangent line E ′ E tangent line E tangent line F ′ F tangent line tangent line

Claims (9)

A dimple foil blade in which a plurality of dimples that do not penetrate the plate are arranged at random on the contact surface with a paper making wire of a foil blade that dehydrates a stock used in a forming part of a paper machine. The dimple foil blade according to claim 1, wherein a plurality of dimples that do not penetrate the blade are arranged in a staggered manner with a center point shifted. The dimple foil blade according to claim 1 or 2, wherein the dimple has a hemispherical shape, a truncated cone shape or a truncated pyramid shape whose sectional area gradually decreases in the depth direction. The dimple foil blade according to any one of claims 1 to 3, wherein the plurality of dimples have the same shape and / or size. The dimple foil blade according to any one of claims 1 to 3, wherein the plurality of dimples have different shapes and / or sizes. The dimple foil blade according to any one of claims 1 to 5, wherein a plurality of randomly arranged dimple arrangements include at least a portion in which columns and / or rows are arranged in an aligned manner. . Hemispherical dimples adjacent arranged in the width direction of the foil (B) of the truncated pyramid shape of a triangle having an apex and in the length direction in (C), most Hirohaba line B of the width direction passing through the center of the dimple (B) contact b the intersection of the opening line of the dimples a in the end (B), and b', the b, tangential B'extending longitudinally relative b', provided B '', the dimples (B the dimples (C) top Hirohaba line C of the corner point c which is the base of the triangle extending in the width direction to form the next to), and c', the point c, the c'the perpendicular length direction The extending line is C ′, C ″, and the end of the widest line A in the width direction passing through the center of the hemispherical dimple (A) adjacent in the length direction between the dimples (B) and (C). contact point a of the intersection of the opening line of a the dimple (a), when the a', the adjacent tangent B'and tangent C'is the dimple (a) Hirohaba line A on a cross or the point a, through the a', dimples foil blade according to any one of claims 1 to 6. Hemispherical adjacent arranged in the width direction of the foil dimple (E) of the truncated pyramid shape of a triangle having an apex and in the length direction in (F), the longest line E longitudinal passing through the center of the dimple (E) Proximity to the intersection of the opening line of the dimples a in the end (E) e, and e', the e, tangent E'extending in the width direction, E '' strings provided for e', said dimples (E the dimple (F) the length direction of the longest line F end point f to form the next to), and f', the point f, the tangent F'extending in the width direction relative f', F ''And the end of the longest line D in the length direction passing through the center of the hemispherical dimples (D) adjacent in the length direction between the dimples (E) and (F ). Proximity to the intersection of the opening line of d, and d', dimples (D) near the side of the tangent E', either or both the dimples, the F'( Longest line D cross or the point d, through d', dimples foil blade according to any one of claims 1 to 7). The dimple foil blade according to any one of claims 1 to 8, wherein the wire contact surface of the foil blade has a slope surface inclined in the traveling direction of the wire.

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