JP2006207096A - Cylindrical cylinder of cylinder paper machine, base paper for oil absorbing tissue and oil absorbing tissue - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical cylinder for making paper to hardly curl. <P>SOLUTION: A cylinder mold 20 constituting the basic skeleton of the cylindrical cylinder of a cylinder paper machine has a large number of plate-like flow regulating plates 24 in parallel with the arrangement direction of the central shaft 21 of the cylindrical cylinder at the outer peripheral edge of the mold. The flow regulating plates 24 are long and narrow plate materials having approximately the same length as that of the cylindrical cylinder, inscribed in a flat ring 25, the plate width directions of the flow regulating plates 24 face the radial direction of the cylinder mold 20 and sides positioned at the outer peripheral sides of the flow regulating plates 24 are fixed to the cylinder mold 20 with a slanting angle so that the sides are positioned at the rotation direction (anticlockwise direction in the figure) side of the cylindrical cylinder relatively to sides positioned at the inner peripheral sides. A curl hardly occurs by reduced inflow resistance of paper stock liquid (white water) during papermaking and reduced difference in fiber orientation between obverse and reverse of wet paper formed on the papermaking net by the cylindrical cylinder equipped with the flow regulating plates 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cylindrical cylinder of a circular net paper machine, a base paper for degreasing paper, and a degreasing paper.

Conventionally, a degreasing paper for cosmetics has been used to remove facial sebum and the like. This cosmetic degreasing paper has long been used as a recycle of foil punched paper manufactured by hand-making. Recently, however, natural fibers such as mulberry, sardine, hemp, wool, and silk are mixed with inorganic fillers, such as clay, talc, kaolin, calcium carbonate, and titanium oxide. Paper is made by a paper machine such as a machine and is mass-produced by a so-called mechanical technique that increases the paper density by supercalendering. For example, there are the following Patent Documents 1 to 3 as a method for producing a degreased paper by a mechanical method.
Japanese Patent Laid-Open No. 10-1900 JP 2000-144600 A JP 2001-258641 A

  In general, a circular net paper machine is used as a paper machine for the manufacture of degreased paper by the mechanical technique disclosed in Patent Documents 1 to 3. In this circular paper machine, a cylindrical cylinder is rotatably supported in the paper making tank, and the stock liquid in the paper liquid is filtered by the paper making a cylindrical cylinder while flowing the stock liquid in the paper making tank in a certain direction. A papermaking method is used in which wet paper is formed by accumulating fibers and the like on a papermaking net. This cylindrical cylinder is composed of a papermaking net disposed on the surface layer and a cylinder mold as a basic skeleton.

  A conventional cylinder mold 50 is shown in FIGS. The cylinder mold 50 includes a plurality of cylinder frames 51 arranged at predetermined intervals in the axial direction of the cylinder rotation shaft, a circular plate ring 52 arranged in a large number between the cylinder frames 51, and a direction orthogonal to the radial direction of the cylinder. A plurality of cylindrical parallel rods 53 provided in contact with the inner peripheral surface of the flat plate ring 52 along the direction parallel to the rotation axis are provided. Each parallel rod 53 is fixedly disposed through an annular portion on the outer periphery of the cylinder frame 51 to connect the cylinder frames 51 to each other, and each parallel rod 53 abuts on the inner peripheral side of each flat plate ring 52 and makes contact therewith. The portions are fixed by welding or the like, and the flat plate rings 52 are also connected to each other. Therefore, the cylinder cylinder 51 and the flat plate ring 52 are fixed to each other via the parallel rod 53, whereby the entire cylindrical cylinder is firmly held. For this reason, the parallel rods 53 are arranged at a predetermined interval (for example, an interval of several tens mm) over the entire circumference of the cylindrical cylinder. Although not shown in the figure, a net is originally formed on the surface of the cylinder mold 50, and wet paper is formed with this net when paper is made.

  In the initial stage of wet paper web formation, since fibers are hardly accumulated on the papermaking net, the inflow resistance when the paper solution passes through the papermaking net is the papermaking net constituting the cylinder mold 50 (not shown). A cylinder frame 51, a flat plate ring 52, and a parallel rod 53. These can be ignored as inflow resistance at the initial stage of wet paper web formation, and the flow of the stock liquid at the time of inflow is almost unimpeded and becomes a uniform flow (the orientation of each fiber). Orientation) is also constant.

  On the other hand, since a certain amount of wet paper has already been formed on the net at the later stage of wet paper formation, the formed wet paper itself is added as a factor of inflow resistance. In particular, when a fine paper mesh is used, fibers having a relatively short fiber length remain on the paper mesh to form a wet paper, increasing the inflow resistance. The basis weight of the paper to be made also affects the inflow resistance. With a small basis weight (for example, several g) and a large basis weight (for example, several tens of g), the latter has a larger inflow resistance of the wet paper formed on the papermaking net.

  Therefore, in the latter stage of wet paper web formation, the wet paper web formed on the papermaking net works synergistically as inflow resistance in addition to the above-described structure, and this inflow resistance causes a decrease in inflow speed and passes through the papermaking net. The flow of the stock liquid is disturbed, and the fiber orientation of the resulting wet paper is relatively poor compared to the initial wet paper formation.

  Therefore, out of the wet paper formed on the net, the wet paper on the net side has a constant fiber orientation, whereas in the wet paper formed on the opposite side, the fiber orientation is disturbed. As a result, a difference occurs in the orientation of the fibers on the front and back of the paper. And the difference of the fiber orientation which arises in the front and back of such a paper leads to the change of the dimensional change rate of a surface and a back surface.

  If there is a difference in the orientation of the fibers on the front and back of the paper, it may not be a practical problem as paper, but if the difference is noticeable, the dimensional change rate on the front and back sides will be greatly different. A three-dimensional deformation (curling or distortion, hereinafter referred to as “curl”) occurs with a change in the size of the fiber. That is, since the orientation (fiber orientation) of the fiber is constant on one side of the paper, the side of the surface remarkably expands and contracts in a certain direction and hardly expands and contracts in the orthogonal direction. On the other hand, since the fiber orientation is random on the surface side where the fiber orientation is not constant, the expansion and contraction direction is also random on the surface side. As a result, only one surface of the paper expands or contracts in a specific direction, and curls that are three-dimensional deformations occur on the flat paper.

By the way, natural fibers, which are the main raw material of degreased paper manufactured by the mechanical method described above, have moisture absorption / release properties, and the dimensions of the fibers slightly change according to changes in humidity.
In particular, when commercializing degreased paper, it is cut into a square of about 10 centimeters and then bound into a booklet in a bundle of about 10 sheets, and then sealed in a vinyl bag. (Product).

  When the user who has obtained the finished product uses this pack-shaped degreasing paper, first take out the entire booklet-shaped degreasing paper from the vinyl bag, and then add the required number of sheets from the bundle in the booklet. Cut out and used. The degreased paper sealed in the vinyl bag maintains the humidity in the bag substantially constant, but is taken out of the vinyl bag in a humidity environment different from that in the bag.

  When the difference in humidity environment between the inside and outside of the vinyl bag is small, curling that occurs on the degreased paper is not so noticeable. When curling occurs in such a degreased paper, there is a problem that the quality of the degreased paper as a product is deteriorated.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a cylindrical cylinder of a circular net paper machine, a base paper for degreased paper, and a degreased paper that hardly cause curling.

  In order to solve the above-mentioned problem, in the invention according to claim 1, a cylindrical cylinder of a circular net paper machine, the cylindrical cylinder is arranged along the axial direction of the cylindrical cylinder over the entire circumference in the circumferential direction. The rectifying plate is inclined with the tip of the rectifying plate facing the inside of the cylindrical cylinder, and the tip of the rectifying plate facing the base end of the rectifying plate facing the direction opposite to the rotational direction of the cylindrical cylinder. The main point is the cylindrical cylinder of the circular paper machine.

In the invention according to claim 2, the thickness of the rectifying plate is gradually decreased from the base end to the tip end.
In the invention according to claim 3, the paper making net used in the cylindrical cylinder is composed of a first wire mesh having 5 to 40 mesh and 60 to 100 mesh disposed below the first wire mesh. This is a paper net made of a second wire net.

The gist of the invention of claim 4 is a base paper for degreased paper made from a natural fiber as a main raw material and made by a circular net paper machine provided with the cylindrical cylinder of claim 3.
In invention of Claim 5, the base paper for oil-removal paper of Claim 4 is processed by the super calender or foiling, and the oil-removal paper which made the paper density 0.7-1.2 g / cm < ³ > is obtained. The gist.

  According to the present invention, it is possible to manufacture a degreased paper base paper and a degreased paper that hardly cause curling.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of a paper machine and a paper making method embodying the present invention will be described with reference to FIGS. FIG. 1 is a schematic side view of a paper machine 1. The paper machine 1 is a so-called circular net paper machine having a circular net, and the basic configuration is not different from the conventional one. In the paper machine 1 of FIG. 1, the right is referred to as downstream and the left is referred to as upstream. The paper machine 1 is roughly composed of a wet part W arranged on the upstream side and a dry part D arranged on the downstream side.

  The wet part W refers to the range in which the wet felt 2 travels. The wet paper P is formed on the surface of the cylinder (paper making process), and the formed wet paper P is moved onto the wet felt 2 to move the wet felt P. The wet paper P is transported while being dehydrated (conveying process), and the final stage of dewatering is performed by the press roll 5 and is transferred to the dry part D (pressing process). The press roll 5 is a boundary part between the wet part W and the dry part D and belongs to both parts.

  The wet part W includes a wet felt 2, a first cylinder 3 and a second cylinder 4, a first paper making tank 6, a second paper making tank 7, a first couch roll 8, a second couch roll 9, a press roll 5, and a plurality of guides. It is composed of rollers.

  In this embodiment, the first papermaking tank 6 and the second papermaking tank 7 are continuously arranged in series, and one cylindrical cylinder is rotatably arranged inside each papermaking tank. The cylinders arranged in the first papermaking tank 6 on the downstream side (right side in FIG. 1) of the paper machine 1 are arranged in the first cylinder 3 and the second papermaking tank 7 on the upstream side (left side in FIG. 1). The cylinder is referred to as a second cylinder 4. A head box 10 is arranged on the most upstream side of the paper machine 1, and a pipe for supplying paper stock extends from the head box 10 to the first paper making tank 6 and the second paper making tank 7 ( Not shown).

  A first couch roll 8 and a second couch roll 9, which are small-diameter rolls, are disposed on the upper portions of the first cylinder 3 and the second cylinder 4. The first and second couch rolls 8 and 9 are configured such that their positions can be individually changed between the upper position and the lower position. For example, when the first couch roll 8 is fixed at the lower position, the wet felt 2 is pressed downward to bring the wet felt 2 into pressure contact with the upper surface of the first cylinder 3. Moreover, when the 1st couch roll 8 is fixed in the upper position, the press of the wet felt 2 is cancelled | released, the wet felt 2 spaces apart from the 1st cylinder 3, and contact between both does not arise. The same applies to the second couch roll 9. The surface of the couch roll is covered with rubber and has a predetermined elastic force.

  The wet felt 2 is a blanket formed in an endless shape, and the wet paper P formed on the surfaces of the first cylinder 3 and the second cylinder 4 is transferred onto the wet felt 2 to support the wet paper P. It is conveyed to the press roll 5 and dehydrated, and further transferred to the dry felt 11. In the wet part W, the wet felt 2 is driven by a drive mechanism (not shown), and the first cylinder 3 and the second cylinder 4 are driven as the wet felt 2 is driven. Therefore, for example, when the first couch roll 8 is fixed at the upper position and the wet felt 2 is separated from the first cylinder 3, the first cylinder 3 does not rotate. The state shown in FIG. 1 is a state in which the wet felt 2 is pressed against the first cylinder 3 and the second cylinder 4 with both the first and second couch rolls 8 and 9 in the lower position.

  The arrangement route of the wet felt 2 will be described with reference to FIG. First, the first and second cylinders 3 and 4 and the first and second couch rolls 8 and 9 disposed at the upper part are passed between the first and second couch rolls 9 and 9 and inverted about 180 degrees around the second couch roll 9. The second paper-making tank 7 and the first paper-making tank 6 are guided almost horizontally to the downstream side with the conveying surface (the surface on which the wet paper P is placed) facing upward. In addition, it is guided to the press roll 5 through a plurality of guide rollers when passing over the first papermaking tank 6, and further returns to the first cylinder 3 through the plurality of guide rollers. The moving direction of the wet felt 2 is a clockwise direction in FIG.

  A suction box 12 is disposed immediately before the press roll 5 on the transport path of the wet felt 2, and the dehydration of the wet paper P is promoted by performing suction from the lower side of the wet felt 2. The press roll 5 has a structure in which a pair of rollers are arranged to face each other, and the wet felt 2 and the dry felt 11 are inserted between the rollers to press the wet felt 2 and the dry felt 11. . The wet paper P is dehydrated by pressing between the rollers (nip pressure), and the wet paper P is transferred from the wet felt 2 to the dry felt 11. Note that both the transfer of the wet paper P from the first cylinder 3 and the second cylinder 4 to the wet felt 2 and the transfer of the wet paper P from the wet felt 2 to the dry felt 11 both have a high surface density. The dry felt 11 generally has a surface density higher than that of the wet felt 2 because it uses the property of shifting to a thing.

  The dry part D is a process of drying the wet paper P transferred from the wet part W in the press roll 5. The dry part D is composed of a press roll 5, an endless dry felt 11, a touch roll 13, a Yankee dryer 14, and a plurality of guide rollers. Such a structure is different from the structure of the dry part in a conventional paper machine. It is not a thing.

  The first papermaking tank 6 and the second papermaking tank 7 are also called bats, and have a box shape with the top opened. In the interior, a fiber material, which is a raw material of paper, and a paper material made of a filler are stored as a suspension (paper material liquid) dispersed in water. Paper making is performed by the cylinder rotating in the stock solution. A discharge port of a supply pipe from the head box 10 is formed on the upstream side of the first paper making tank 6 and the second paper making tank 7, and the first cylinder 3 and the second cylinder 4 are provided in each cylinder. A suction mechanism is provided to suck in the stock liquid that flows in (exactly white water obtained by filtering the stock liquid through a screen, and contains almost no fibers) (the discharge port and suction mechanism are not shown). ). Then, the paper material liquid sucked by the suction mechanism is returned to the head box 10, and the paper material or the like is added again to prepare a paper material liquid having a predetermined concentration, and the first paper making tank 6 and the second paper making tank 7 are supplied from the supply pipe. The paper stock solution is supplied. This circulation provides a flow of the stock liquid in a certain direction in the tank and makes the concentration of the stock liquid uniform.

  The first cylinder 3 and the second cylinder 4 are different only in the construction of the paper mesh stretched on their surfaces, and the other construction is the same. Accordingly, the configuration of the first cylinder 3 with respect to the common configuration also applies to the second cylinder 4. The first cylinder 3 includes a cylinder mold 20 that forms its basic skeleton. As shown in FIG. 2, the cylinder mold 20 has a hollow cylindrical shape, and a shaft 22 is disposed through the central axis 21. The shaft 22 is supported by a bracket (not shown) in the first papermaking tank 6 so that the first cylinder 3 is held at a predetermined position. As the wet felt 2 is driven, the first cylinder 3 stores the stock liquid. The inside of the papermaking tank 6 is rotated.

  The cylinder mold 20 is in contact with a plurality of cylinder frames 23 arranged at predetermined intervals in the axial direction of the central shaft 21 and the outer peripheral surface of the cylinder frame 23, and the axial direction of the central axis at predetermined intervals in the circumferential direction. And a large number of flat plate rings 25 arranged in contact with the rectifying plate 24 (FIGS. 2 and 3). The cylinder frame 23 is a steel member formed with a stay 26 extending in a petal shape from the central shaft 21 and having an annular portion on the outer periphery. The cylinder frame 23 is predetermined in the axial direction of the central shaft 21. A plurality are arranged at intervals (FIGS. 2 and 3). The cylinder frame 23 is a basic skeleton of the cylinder mold 20 in terms of strength, and is formed thicker and stronger than the rectifying plate 24 and the flat plate ring 25. As shown in FIG. 3, the cylinder frame 23 that is disposed at both ends of the cylinder has a larger diameter portion than the cylinder frame 23 that is disposed outside the same portion.

  The current plate 24 is disposed in contact with the outer peripheral surface of the annular portion of each cylinder frame 23 excluding both ends of the cylinder. This rectifying plate 24 is replaced with a conventional parallel rod, and each of the rectifying plates 24 is arranged parallel to the axis of the central axis 21 of the cylinder (along the axial direction of the first cylinder 3), and the rectifying plate 24 is rectified. The plates 24 are arranged at predetermined intervals over the entire circumferential direction of the outer peripheral surface of the cylinder frame 23. Therefore, the first cylinder 3 has a structure in which a large number of rectifying plates 24 are disposed along the entire circumference of the first cylinder 3 and along the axial direction of the central shaft 21.

  Each rectifying plate 24 is a narrow and long plate having a length over the entire length of the first cylinder 3, that is, substantially the same as the length in the axial direction. FIG. Further, each rectifying plate 24 is a side (shown in FIG. 5) located on the inner side from a side on the radially outer side of the cylinder (also referred to as a base end below the rectifying plate 24 shown in FIG. 5). It is formed in a tapered shape such that its thickness is gradually reduced toward the top of each rectifying plate 24.

  Further, as shown in FIGS. 4 and 5, each rectifying plate 24 is arranged such that a line connecting the base end and the tip end is inclined with respect to a radial line of the cylinder (a line extending in the radial direction from the central axis). However, the inclination angle is related to the direction in which the first cylinder 3 rotates. The first cylinder 3 shown in FIGS. 4 and 5 rotates counterclockwise in the figure, and the rectifying plate 24 faces the base end in a direction opposite to the rotation direction of the cylinder. Inclined.

  The rectifying plate 24 of the present embodiment is inclined at an angle (α) of about 35 degrees with respect to a line connecting the base end thereof and the center of the cylinder frame 23 (dashed line in FIG. 5). The inclination angle (α) is preferably set in a range of about 20 to 70 degrees in order to reduce the inflow resistance and exert a rectifying effect. However, in a cylinder used for high speed papermaking, the rectifying plate is set by increasing the angle. It is preferable that 24 is in a more laid state.

  The contact portion between the tip of each rectifying plate 24 and the outer peripheral surface of the annular portion of the cylinder frame 23 is fixed by welding, and both end portions in the longitudinal direction of each rectifying plate 24 are annular portions located at both ends of the cylinder. Is in contact with the annular portion side portion of the cylinder frame 23 having a large diameter, and is fixed by welding at the contact portion. 4 and 5 have large diameter annular portions disposed at both ends of the cylinder mold 20, and therefore the tip of the current plate 24 is disposed at both ends. The cylinder frame 23 is in contact with the annular portion side portion of the cylinder frame 23 and is fixed by welding at the contact portion.

  A large number of flat plate rings 25 are arranged outside the base end of the rectifying plate 24 so that the inner peripheral surfaces thereof are in contact with each other. In the first cylinder 3 of the present embodiment, a wire mesh is stretched on the outer peripheral surface of the flat plate ring 25. The flat ring 25 is regularly arranged with a predetermined interval in the axial direction of the central shaft 21. Each flat ring 25 is formed in an annular plate having a small thickness, and the cross-section of the outer peripheral end portion is rounded so that the first cylinder 3 is rotated in the paper material during paper rotation. The rotation resistance is reduced and the inflow resistance of the stock liquid into the first cylinder 3 is reduced. The contact portion between the current plate 24 and the flat plate ring 25 is fixed by welding. The arrangement interval of the rectifying plates 24 in the circumferential direction of the cylinder may be the same as that of a conventional parallel rod, but the number of arrangements and the arrangement interval are changed to increase or decrease so that the strength of the entire cylinder does not decrease. It is possible to do.

  The first cylinder 3 and the second cylinder 4 have a wire mesh layer in which a plurality of wire meshes 31, 32, 31 to 33 having different wire diameters and mesh numbers are stretched on the outer surface of the flat plate ring 25. Among these, the metal nets 31 and 32 stretched on the first cylinder 3 are two-layer metal nets composed of a lower net 31 and an upper net 32 as a paper making net (FIG. 6A). On the other hand, the second cylinder 4 has a three-layered wire mesh in which a lower wire 31 and an upper mesh 32 as a paper making mesh are further laminated with a single wire mesh (uppermost net) 33 as a paper making mesh (FIG. 6 ( b), FIG. 6 (c)).

  In the first cylinder 3 and the second cylinder 4, the lower net 31 stretched so as to cover the entire peripheral surface of the cylinder portion of the cylinder is a metal net formed by plain weaving metal wires, and the number of meshes of the metal net (1 The number of wires constituting the wire mesh per inch) is 8 to 16 mesh, and the wire diameter of the wire used for the wire mesh is about 0.4 to 0.7 mm.

  The lower net 31 is stretched in an endless manner so as to cover the entire cylindrical portion of the cylinder, and both ends of the lower net 31 are joined by a silver gutter. The lower network 31 is used to protect the upper network 32, and the lower network 31 itself does not have a function as a papermaking network. Further, the lower net 31 is formed at a portion where the papermaking net contacts the cylinder mold 20 during papermaking by forming a gap between the upper net 32 as the papermaking net and the cylinder mold 20 (the flat plate ring 25 in the present embodiment). The flow of the stock liquid on the screen surface is made uniform so that the flow of the stock liquid from the inside to the inside is not obstructed.

  An upper net 32 is stuck on the lower net 31 so as to overlap therewith. The upper net 32 functions as a paper making net. When the paper material liquid passes from the outside of the first cylinder 3 and the second cylinder 4 to the inside, the liquid passes through the eyes of the upper net 32 and enters the inside of the cylinder. And flows in. However, most of the paper stock, which is a fiber, is filtered without passing through the eyes of the upper screen 32 and stays on the surface of the upper screen 32, and as a result, the wet paper P is formed on the upper screen 32.

  Similarly to the lower net 31, a metal net formed by plain weaving of metal wires is used for the upper net 32. The upper net 32 is stretched so as to cover the entire lower net 31, and both ends are endless by silver splicing. In this way, the paper machine (upper net) 32 is circular when viewed from the side, and the paper machine 1 having such a configuration is called a circular paper machine.

  In order to keep (attach) the fibers on the surface of the upper net 32, the wire net used as the upper net 32 is finer than the lower net 31 and has a smaller wire diameter. Specifically, the wire mesh used as the upper mesh 32 has a mesh number range of 60 to 100 mesh, and the wire mesh diameter corresponding to the mesh number in this range is 0.1 to 0.3 mm.

  In the present embodiment, the first cylinder 3 has a two-layered wire mesh in which a two-layered wire mesh of a lower mesh 31 and an upper mesh 32 as a paper making mesh is stretched (FIG. 6A). On the other hand, in the second cylinder 4, a further metal mesh (also referred to as “uppermost mesh”) 33 is stretched on the outside (upper side) of the lower mesh 31 and the upper mesh 32 serving as a paper making mesh. There are a total of three layers (FIGS. 6B and 6C).

  The uppermost mesh 33 used for the second cylinder 4 is coarser than the upper mesh 32. Specifically, the number of meshes of the wire mesh is selected according to the raw material of paper to be made, basis weight, etc., but the range that can be taken is 5 to 40 mesh, and the linearity is 0.1 to 1.0 mm. In this way, a wire mesh 33 having a coarser mesh than the upper mesh 32 is stretched on the upper mesh 32, in other words, a mesh having a finer mesh than the uppermost mesh 33 is stretched downward as the upper mesh 32. Long fibers stay on top 33. Further, the fibers having a short fiber length are not hindered by the uppermost net 33 but remain on the upper net 32. As a result, as shown in the cross-sectional view of FIG. 9, recesses corresponding to the number of meshes and the wire diameter of the uppermost mesh 33 are formed in the wet paper P at the paper making stage. This also partially obstructs the stock adsorbed by the upper screen 32 in the thickness direction.

  The paper machine 1 described above has a configuration including two cylinders, a first cylinder 3 and a second cylinder 4, and manufactures two layers of paper by rotating both the first cylinder 3 and the second cylinder 4 together. can do.

  On the other hand, the first cylinder 3 and the second cylinder 4 can be driven individually. That is, as described above, the first couch roll 8 and the second couch roll 9 can be individually changed to the upper position and the lower position. When each of them is moved to the upper position, the wet felt 2 is separated from the first cylinder 3 or the second cylinder 4. For this reason, when the first couch roll 8 is set to the upper position and the second couch roll 9 is set to the lower position, only the second cylinder 4 can be rotated to manufacture one sheet of paper. On the other hand, when the second couch roll 9 is set to the upper position and the first couch roll 8 is set to the lower position, only the first cylinder 3 is rotated, and one sheet of paper can be produced in the same manner. In this case, even if the same layer of paper is used, the resulting paper has different properties because the structure of the net is different.

  Therefore, in the paper machine 1 having the two cylinders, two layers of paper can be manufactured by driving both of the two cylinders, and any one of the two cylinders can be manufactured. One sheet of paper can be manufactured by stopping the cylinder and driving the other cylinder. Therefore, the paper machine 1 can produce a total of three patterns of paper.

Next, the method for producing a double-layered degreased paper using the paper machine 1 in the above embodiment will be described in detail.
The raw material used for the degreased paper is mainly composed of natural fibers, i.e., bast fibers made of manila hemp, flax, jute, husk, cocoon, cocoon, plant fibers such as wood pulp, or animal fibers such as wool, silk, cashmere, etc. (50% by weight or more) is preferable. If it is less than 50% by weight, it is not preferable in terms of removing fat during use as a degreased paper.

  In order to use natural fiber as a raw material, it is prepared to a predetermined beating degree with a beater such as a beater, and further, an inorganic filler such as clay, talc, kaolin, calcium carbonate or the like is added to enhance oil absorption. Moreover, a fixing agent and an antibacterial agent can also be contained as needed. In the series of manufacturing steps in the present embodiment, “paper making” refers to both paper (things) made by the first cylinder 3 and the second cylinder 4 and paper making (method) by the paper machine. There is a case.

  A prescribed amount of a stock solution adjusted to a predetermined concentration is introduced into the first paper making tank 6 and the second paper making tank 7 of the paper machine 1 and circulates in the tank. The first and second couch rolls 8 and 9 are both in the lower position, and the wet felt 2 is pressed against the first cylinder 3 and the second cylinder 4. In this state, driving and transport of the wet felt 2 is started, and at the same time, the suction mechanism that performs suction from the inside of the cylinder is also started to drive the stock liquid positively from the outside to the inside of the first cylinder 3 and the second cylinder 4 respectively. Inflow.

  As the drive of the wet felt 2 starts, the first cylinder 3 and the second cylinder 4 rotate in a counterclockwise direction in FIG. When the suction mechanism operates in this state, the paper material liquid outside the cylinder flows into the cylinder.

  At this time, the stock liquid outside the first cylinder 3 flows inward through the metal meshes 31 and 32, but most of the fibers present in the stock liquid cannot pass through the upper mesh 32 of the first cylinder 3. As a result, the wet paper web P1 is formed on the surface of the first cylinder 3.

  In the initial stage of wet paper web formation, it is only the configuration of the first cylinder 3 that causes the inflow resistance when the paper stock liquid passes from the first paper making tank 6 into the first cylinder 3. There is hardly any disturbance, and the wet paper web P1 formed on the papermaking net in the initial stage has a constant fiber orientation.

  On the other hand, in the later stage of wet paper web formation, the wet paper web P1 itself formed in addition to the configuration of the first cylinder 3 can also be a factor of the inflow resistance in the passage of the paper material liquid. However, since the first cylinder 3 is provided with the rectifying plate 24, the inflow resistance during the inflow of the stock liquid is reduced, and the sample liquid that has flowed into the first cylinder 3 is transferred to the plate of the rectifying plate 24. Smooth guidance to the inside with a certain direction along the surface.

  The wet paper P1 formed on the net 32 of the first cylinder 3 is pulled up from the stock liquid along with the rotation of the first cylinder 3 and conveyed toward the top of the first cylinder 3. On the other hand, since the wet felt 2 is pressed against the top of the first cylinder 3 by the first couch roll 8, the wet paper web P <b> 1 is sandwiched between the first cylinder 3 and the wet felt 2. Therefore, the wet paper P1 is dehydrated by the pressure of the first couch roll 8 and moves from the first cylinder 3 to the wet felt 2 by the surface tension.

  This state is shown in FIG. In the figure, for the sake of explanation, the number of meshes and the wire diameter of the wire nets 31 and 32 are exaggerated and expressed larger than the size actually used. Therefore, the wet paper P1 made by the wire nets 31 and 32 is also exaggerated in terms of the overall thickness and the like than the actual one. The wet paper P1 is conveyed toward the second papermaking tank 7 while being attached to the lower surface of the wet felt 2 due to surface tension. Similarly, in the second paper making tank 7, the stock liquid is sucked from the inside of the second cylinder 4, and the wet paper P <b> 2 is accumulated on the surface of the rotating second cylinder 4.

  In the second cylinder 4, the uppermost mesh 33 is disposed so as to overlap the outer side of the upper mesh 32, so that fibers having a long fiber length among the fibers in the stock liquid first adhere to the uppermost mesh 33. On the other hand, fibers having a fiber length that is short enough to pass through the uppermost mesh 33 adhere to the finer upper mesh 32. For this reason, the wet paper P2 formed on the second cylinder 4 is formed flat on the outer surface side, while the inner surface side (side in contact with the wire mesh) is partially provided with the paper stock in the thickness direction by the uppermost mesh 33. The cross section is formed as a uniform unevenness by forming a concave portion that is obstructed by the concave portion and forming a convex portion on the upper net 32 evenly (FIG. 8). Finer fibers pass through the upper mesh 32 together with the stock liquid.

  In the second cylinder 4, the paper making net has a two-layer metal net structure of an upper net 32 and an uppermost net 33, and it can be said that the paper making net is more clogged than the first cylinder 3. Therefore, the second cylinder 4 has a larger inflow resistance of the paper material liquid than the first cylinder 3 even when the wet paper P2 is not formed. The inflow resistance is larger, and the liquid flow is likely to be disturbed.

  However, since the rectifying plate 24 is provided in the second cylinder 4 similarly to the first cylinder 3, the inflow resistance during the inflow of the stock liquid is reduced, and the sample liquid that has flowed into the second cylinder 4 is reduced. Is smoothly guided inward along the plate surface of the current plate 24 in a fixed direction.

  For this reason, although the second cylinder 4 has a three-layered wire mesh having a large inflow resistance, the flow of the stock liquid is rectified in a certain direction without being disturbed during suction. Therefore, even when the wet paper P2 is formed on the paper making net of the second cylinder 4, it is possible to suppress turbulent flow in the passage of the paper material.

  The wet paper P2 formed on the uppermost net 33 of the second cylinder 4 is pulled up from the stock liquid as the second cylinder 4 rotates, and is sandwiched between the top of the second cylinder 4 and the wet felt 2. Thus, dehydration and transfer to the wet felt 2 are performed. Since the wet paper P1 formed in the first cylinder on the downstream side has already moved on the wet felt 2, the wet paper P2 formed by the second cylinder 4 is moved over the wet paper P1. Is done. At this time, the wet paper P2 is superimposed on the wet paper P1 already on the wet felt 2 in the same direction. The front surface of the paper P1 and the back surface of the wet paper P2 are overlapped to form a so-called two-layer wet paper P here.

  This state is shown in FIG. For the sake of explanation, the number of meshes of the wire nets 31 to 33, the wire diameter, and the surface shape of the produced wet paper P2 are also exaggerated in comparison with the actual ones. The wet paper P formed in a two-layer structure is transported downstream while being placed on the wet felt 2 with its transport direction and top and bottom being reversed along the peripheral surface of the second couch roll 9.

  FIG. 9A shows a schematic diagram of wet paper at the stage of paper making. This is a state of the wet paper P that has been easily dehydrated by the second couch roll 9 after paper making and transferred onto the wet felt 2, and has a high moisture content in the wet paper P and is in a so-called paste form. Initially, as shown in FIG. 8, the uneven side is directed downward, and after passing through the second couch roll 9, the top and bottom are reversed to a state shown in FIG. 9A. Further, the irregularities formed by the upper mesh 32 and the uppermost mesh 33 remain even during the conveyance, and the individual fibers constituting the wet paper web P are already entangled with each other. It will not be completely flat if it breaks down and moves into a recess.

  The wet paper P is placed on the wet felt 2 in a two-layer structure (P1, P2) and conveyed toward the press roll 5. In the press roll 5, the dry felt 11 is stacked from the upper side of the wet paper P, covered with the wet felt 2 from the lower side and covered with the dry felt 11 from the upper side, and further pressed by the press roll 5 from above and below them. Dehydration is performed (FIG. 9B).

Thereafter, the wet paper P is transferred from the wet felt 2 to the dry felt 11, transported to the dry felt 11, dried by the Yankee dryer 14, and taken up on the take-up roll 15. Further, when used as a degreased paper, a high-pressure treatment is applied so that the paper density is in the range of 0.7 to 1.2 g / cm ³ , and the product is cut into a predetermined size and is made into a regular product. It becomes.

Hereinafter, the present invention will be described with reference to examples and comparative examples.
Composition of raw materials and paper machine "Raw materials"
Manila hemp pulp (beaten to 30 ° with a beater) 100 parts by weight Microtalc 20 parts by weight Phyrex RC-104 (Meisei Chemical Co., Ltd.) 0.5 parts by weight Phyrex M (Meisei Chemical Industry Co., Ltd.) 0.5 wt Department "Configuration of paper machine"
The paper machine 1 described in the above embodiment was used, and the following papermaking nets were stretched for the first cylinder 3 and the second cylinder 4 (common to each example and each comparative example).
* 1st cylinder 16 mesh mesh wire with 0.5 mm wire diameter
Wire mesh of 90 mesh and wire diameter of 0.132 mm as upper mesh * 2nd wire Wire mesh of 16 mesh and wire diameter of 0.5 mm as lower mesh
Wire mesh of 90 mesh and wire diameter of 0.132mm as upper mesh
Example 1 wire mesh of 16 mesh and wire diameter of 0.2 mm as the uppermost mesh
In the first embodiment, the second cylinder 4 of the paper machine is stopped (the wet felt 2 and the second cylinder 4 are not in contact with the second couch roll 9 in the upper position), and only the first cylinder 3 is used. A sheet of paper was made. The basis weight of the paper was 20 g / ^{m 2.} In addition, a cylinder mold provided with a current plate 24 was used for the first cylinder 3.

  A sheet of wet paper formed in the first cylinder 3 is dried with a dryer and is not subjected to high density treatment such as foil punching or supercalendering. "). In addition, the base paper is cut into a 21 cm square, and the base paper and the hatron paper are alternately stacked to form a bundle. The foil punching process was performed under the condition of a punching time of 105 seconds to obtain a foil punching degreased paper (simply called “processed paper”).

Comparative Example 1
On the other hand, as Comparative Example 1, a first cylinder was made using a cylinder mold provided with the conventional parallel rod shown in FIGS. Otherwise, the conditions are the same as in Example 1. Further, after paper making, a base paper and a processed paper were obtained in the same manner as in Example 1.

Example 2
In Example 2, the first cylinder 3 of the paper machine was stopped (the first felt 2 and the first cylinder 2 were not in contact with the first couch roll 8 in the upper position), and only the second cylinder 4 was used. A sheet of paper was made. The basis weight of the paper was 20 g / ^{m 2.} A cylinder mold provided with a current plate 24 was used for the second cylinder 4. One layer of wet paper formed by the second cylinder 4 was processed in the same manner as in Example 1 to obtain base paper and processed paper, respectively.

Comparative Example 2
On the other hand, as Comparative Example 2, one sheet of paper was made using a cylinder mold having the conventional parallel rod shown in FIGS. Otherwise, the conditions are the same as in Example 2. Further, a base paper and a processed paper were obtained in the same manner as in Example 2 after papermaking.

Example 3
In Example 3, both the first cylinder 3 and the second cylinder 4 of the paper machine were driven to make two layers of paper. The basis weight of the paper was 10 g for each cylinder, for a total of 20 g / m ² . Moreover, the cylinder mold provided with the baffle plate 24 in both the 1st cylinder 3 and the 2nd cylinder 4 was used. Two layers of wet paper formed by the first cylinder 3 and the second cylinder 4 were processed in the same manner as in Example 1 and Example 2 to obtain base paper and processed paper, respectively.

Comparative Example 3
On the other hand, as Comparative Example 3, two layers of paper were made using a conventional cylinder mold provided with parallel rods shown in FIGS. 11 and 12 for the first cylinder and the second cylinder. Otherwise, the conditions are the same as in Example 3. Further, a base paper and a processed paper were obtained in the same manner as in Example 3 after papermaking.

About curl test method About base paper and processed paper (total 6 patterns) obtained by Examples 1 to 3 and Comparative Examples 1 to 3, a moisture release test and a moisture absorption test were performed by the following methods, respectively, and curls generated after the test Was evaluated.

Pretreatment (humidity control)
A large number of sample paper pieces were prepared by cutting the base paper and processed paper of each Example and Comparative Example prepared by the above method into a square of 100 mm square, and these sample paper pieces were placed on a flat plate to be 23 degrees Celsius, humidity It was allowed to stand for 4 hours in a desiccator having a 50% environment (compliant with JIS 8111).

  A moisture release test or moisture absorption test was performed on each sample paper piece conditioned to the standard state. In the moisture release test, each piece of sample paper after humidity control was placed on a flat plate and left in a desiccator at 23 degrees Celsius and 20% humidity for 4 hours. As a moisture absorption test, each sample paper piece after humidity conditioning was placed on a flat plate and left for 4 hours in a desiccator at 23 degrees Celsius and 90% humidity. After the test time of the moisture release test or the moisture absorption test, each sample paper piece was taken out from the desiccator and placed on a flat measuring table, and the following items were measured for curls generated on the sample paper piece. Note that the measurement was performed within 15 seconds after removal from the desiccator because the state of curl may change due to environmental changes due to removal. In addition, 10 sheets of sample paper pieces of each pattern on which curls were formed toward the upper side were used as measurement targets.

  FIG. 10 shows a state of the sample paper piece on which the curl is formed. 10A to 10C are schematic views of a sample paper piece on which a weak curl is formed on the left side and a sample paper piece on which a strong curl is formed on the right side. 10A is a plan view of the sample paper piece, FIG. 10B is a curled state when the upper side of the sample paper piece of FIG. 10A is viewed from above, and FIG. 10C is the lower side of the sample paper piece. Is a curled state as seen from the bottom of the drawing.

* Measurement item 1 Length of ground plane (mm)
As shown in FIG. 10 (a), the average of the length (a) of the ground contact portion on one side of the sides orthogonal to the curl (winding) direction and the length (b) of the installation portion on the other side. Was rounded off to the nearest whole number.

* Measurement item 2 Curl angle (degrees)
As shown in FIG. 10B and FIG. 10C, the angle (β) formed by the line connecting the contact portion where the curling is started and the tip of the curl portion with respect to the contact surface is rounded off to one place. It was measured. In addition, when two or more curls are formed on one piece of sample paper as shown in FIG. 10 (FIG. 10B and FIG. 10C), the angle is more than a plurality of angles (β). The higher curl angle was targeted. Therefore, in the sample paper piece on the left side of FIG. 10, the angle (β) shown in FIG. Also, as shown on the right side of FIGS. 10B and 10C, when the curl angle is 360 degrees or more, the curl angle interferes with each other and the exact curl angle becomes unknown, so 360 degrees. That is all.

The measurement item 1 and the measurement item 2 were measured for each of the sample paper pieces of Examples 1 to 3 and Comparative Examples 1 to 3, and an average value was obtained.
The measurement results for the measurement items 1 and 2 are shown in Tables 1-1 to 1-6 below.

表１−１乃至表１−６からも明らかなように、実施例１〜３の原紙及び加工紙には吸放湿によって紙にカールが生ずるものの、その程度はそれぞれ対応する比較例１〜３の原紙及び加工紙に比して極めて軽微である。また、一基のシリンダによって抄紙する場合ならびに二基のシリンダによって抄紙する場合にかかわらず、シリンダに整流板を設けることにより平行ロッドを設けたシリンダに比して脂取り紙原紙或いは脂取り紙に生ずるカールが軽減されることが明らかとなった。

As is clear from Table 1-1 to Table 1-6, the base paper and processed paper of Examples 1 to 3 are curled on the paper due to moisture absorption and desorption. It is extremely light compared to the base paper and processed paper. Regardless of whether paper is made with a single cylinder or paper with two cylinders, a straightening plate is provided on the cylinder, so that the base paper or oil-repellent paper is better than a cylinder with a parallel rod. It has been found that the resulting curl is reduced.

  In each of Example 3 and Comparative Example 3, two layers of individually formed wet paper were laminated to form one layer of paper so that the other back surface was bonded to one surface. It is a structure in which the front surface and the back surface of the other wet paper (a surface with good fiber orientation and a surface with bad fiber orientation) are bonded together. For this reason, in Comparative Example 3, curling is offset at the bonded portion, and in Comparative Examples 1 to 3, both the moisture absorption and moisture release test results are good. However, by using a cylindrical cylinder further provided with a current plate as shown in Example 3, a better test result can be obtained than when no current plate is provided (Comparative Example 3). The effect of the current plate was also observed.

According to the said form, the following effects can be acquired.
(1). A rectifying plate 24 is provided on the outer peripheral portions of the first cylinder 3 and the second cylinder 4. For this reason, since the stock liquid flows along the rectifying plate 24 when passing through the paper mesh stretched on the outer periphery of the cylinder, the flow at the time of inflow is rectified and hardly disturbed, and the moisture formed on the paper mesh is The fiber orientation of the paper becomes constant.
(2). Among the formed wet papers, the difference between the orientation of the fibers accumulated on the net making side and the orientation of the fibers on the opposite side is reduced, and the curl generated on the paper due to the humidity change is further reduced.
(3). The current plate 24 is provided with an inclination. For this reason, the plate surface of the rectifying plate 24 does not become an inflow resistance when suction is performed while the cylinder rotates.
(4). In the above-described embodiment, the 90 mesh wire net 32 is arranged on the second cylinder 4 as a paper making net on the lower side of the 20 mesh wire net 33. For this reason, it is possible to produce a uniform paper without unevenness.
(5). Since the degreased paper is made as a two-layered structure (P1, P2), it is possible to make a cosmetic degreased paper having a different texture by changing the basis weight, raw material, etc. for making each layer. .
(6). A mesh pattern of the uppermost net 33 is formed on the made degreased paper. For this reason, a visually good texture can be obtained.

In addition, you may change the said embodiment as follows.
In the above embodiment, in the paper machine 1 provided with the first cylinder 3 and the second cylinder 4, only the second cylinder 4 is a three-layer metal mesh 31-33, but the second cylinder 4 has two metal meshes. The layers 31 and 32 and the wire mesh of the first cylinder 3 may be three layers 31 to 33. Moreover, it is good also as the three layers 31-33 with the wire mesh of the 1st cylinder 3 and the 2nd cylinder 4. FIG.

  In the above embodiment, the flow straightening plate 24 is provided on the first cylinder 3 and the second cylinder 4, but the flow straightening plate 24 of the first cylinder 3 may be omitted when making paper with two layers. Since the first cylinder 3 has a two-layered wire mesh structure, the inflow resistance is smaller than that of the second cylinder 4 having a three-layered wire mesh structure, so that the wet paper web formed by the first cylinder is smaller than the second cylinder 4. The difference in fiber orientation occurring on the front and back is small.

  In the paper machine 1 of the above-described embodiment, the first machine 3 and the second cylinder 4 are provided. However, a paper machine provided with three or more cylindrical cylinders may be used. In this case, the rectifying plate 24 is provided on a cylindrical cylinder having at least a papermaking net having a large inflow resistance.

  As the rectifying plate 24, a plate having a constant thickness in the plate width direction may be used. For example, rib-shaped protrusions may be formed along the plate width direction. The rectifying effect can be exhibited also by this.

Next, a technical idea that can be grasped from the above embodiment and another example will be additionally described.
(A) A 5 to 40 mesh wire mesh was used as the first mesh, and a 60 to 100 mesh wire mesh was stretched under the first mesh as a second mesh. A paper making method for making paper using a paper machine.

  According to the invention described in (a), paper with no unevenness can be made.

Outline side view of the paper machine of this embodiment The perspective view of the cylinder mold of this embodiment Front view of cylinder mold of this embodiment AA line sectional view of FIG. Partial enlarged view of FIG. 6A is a conceptual view of a papermaking network, FIG. 6A is a papermaking network composed of a lower network and an upper network, FIG. 6B is a papermaking network further provided with an uppermost network, and FIG. 6C is a perspective view of FIG. Conceptual diagram of paper making in the first cylinder 3 Conceptual diagram of paper making in the second cylinder 4 Cross-sectional view of a two-layer paper, FIG. 9 (a) is a wet paper state, FIG. 9 (b) is a pressurized state 10A is a plan view of the sample paper piece, and FIGS. 10B and 10C are schematic views showing the curl of the sample paper piece of FIG. A perspective view of a conventional cylinder mold BB sectional view of FIG.

Explanation of symbols

1 .... paper machine, 3 .... cylindrical cylinder (first cylinder), 4 .... cylindrical cylinder (second cylinder), 6,7 ..., making machine, 10 .... head box, 20 .... cylinder mold, 23. · Cylinder frame, 24 ·· Current plate, 25 · · Flat plate ring, 31 · · Lower net, 32 · · Upper net, 33 · · Upper net, W · · Wet part, D · · Dry part, P · · Wet paper .

Claims (5)

  A cylindrical cylinder of a circular net paper machine, the cylindrical cylinder having a current plate arranged along the axial direction of the cylindrical cylinder over the entire circumference of the circumferential direction. A circular cylinder of a circular net paper machine in which the inner side of the cylindrical cylinder is oriented and the tip of the rectifying plate is inclined with respect to the base end of the rectifying plate toward the opposite side of the rotational direction of the cylindrical cylinder.   The cylindrical cylinder of the circular mesh paper machine according to claim 1, wherein the rectifying plate has a thickness that is gradually decreased from the base end toward the tip end.   The papermaking net used in the cylindrical cylinder is a papermaking net consisting of a first wire mesh consisting of 5 to 40 mesh and a second wire mesh consisting of 60 to 100 mesh arranged below the first wire mesh. A cylindrical cylinder of a circular net paper machine according to claim 1 or 2.   A base paper for degreased paper, made of natural fiber as a main raw material, and made by a circular net paper machine provided with the cylindrical cylinder according to claim 3. A degreased paper obtained by processing the base paper for degreased paper according to claim 4 by super calendering or foil punching to a paper density of 0.7 to 1.2 g / cm ³ .

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