Method for manufacturing oil-blotting paper

Abstract

To provide a method for manufacturing oil-blotting paper with excellent usability. [Solution] The method includes the process of manufacturing oil-absorbing paper by beating oil-absorbing paper base paper, which is made from raw materials containing natural fibers using a cylinder paper machine, with a foil beating machine, wherein the process of manufacturing oil-absorbing paper by beating includes a first step of beating the entire surface of the oil-absorbing paper base paper in the direction of orientation of the natural fibers, and a second step, after the first step, of beating the entire surface of the oil-absorbing paper base paper in a direction perpendicular to the orientation direction.

Description

[Technical Field]

[0001] This invention relates to a method for manufacturing oil-blotting paper. [Background technology]

[0002] Oil-blotting paper has traditionally been used to remove sebum and other oils from the face. In the past, this oil-blotting paper was reused from used gold-beating paper, which was used to sandwich the gold leaf in the production of gold leaf. As a result of being beaten with the gold leaf, the gold-beating paper becomes densely packed, and when oil-blotting paper is pressed against the skin, sebum and other oils are absorbed by the fibers.

[0003] Recently, oil-blotting paper is being industrially produced using cylinder papermaking machines and the like, primarily using natural fibers such as paper mulberry, mitsumata, hemp, and wood pulp as raw materials. Furthermore, the oil-blotting paper produced is subjected to high-density treatments such as supercalendering or foil beating (Patent Documents 1 to 3). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2004-73886 [Patent Document 2] Japanese Patent Publication No. 2006-291370 [Patent Document 3] Japanese Patent Publication No. 2006-207096 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] When foil beating is performed as a high-density treatment for oil-absorbing paper, the oil-absorbing paper base paper is cut to a certain size (for example, 21 cm square) before foil beating, and several hundred sheets are stacked alternately with laminated paper. This stack is then foil-beaten using a foil beating machine equipped with a hammer, at a rate of approximately 500 times / minute from the stack surface and a foil beating time of 105 seconds (Patent Document 1, paragraph 0042; Patent Document 2, paragraph 0034; Patent Document 3, paragraph 0066).

[0006] Incidentally, in a cylinder screen papermaking machine used to manufacture oil-absorbing paper base paper, a cylindrical cylinder is rotatably supported within the vat. Then, by filtering the paper pulp liquid in the vat through the screen of the rotating cylindrical cylinder while flowing the pulp liquid in a constant direction, fibers and other materials in the pulp liquid accumulate on the screen, and wet paper is continuously formed.

[0007] When natural fibers are used as raw materials for oil-absorbing paper, even if the fibers are broken down by beating or other methods, the broken-down fibers still remain in the form of long, thin strings. Furthermore, when the pulp liquid containing the fibers is flowed in a certain direction within the vat, the longitudinal direction of each fiber tends to align with the flow of the pulp liquid.

[0008] In a cylinder paper machine, the pulp liquid in the vat flows perpendicular to the axis of the cylindrical cylinder in order to eliminate unevenness in the thickness of the paper being made. Since the longitudinal direction of the fibers in the pulp liquid is aligned with the flow of the pulp liquid, the fibers contained in the grease-absorbing paper produced by a cylinder paper machine tend to orient in a direction perpendicular to the axis of the cylindrical cylinder, that is, in the direction of paper formation (left and right direction in Figure 1). Hereinafter, the direction of paper formation in a paper machine will be referred to as the "fiber orientation direction" of the paper produced by the paper machine. Therefore, the fiber orientation direction does not mean that all the fibers contained in the paper are oriented in the same direction, but rather it means the direction in which the longitudinal direction of the fibers contained in the paper tends to orient. Also, the direction perpendicular to the direction of paper formation will be referred to as the direction perpendicular to the fiber orientation direction.

[0009] By the way, Patent Documents 1 to 3 do not disclose the relationship between the fiber orientation direction and the foil-beating direction in oil-blotting paper. The inventor discovered that there is a relationship between the orientation direction of the fibers in oil-blotting paper and the direction of foil application that affects the feel of the oil-blotting paper.

[0010] Therefore, the present invention aims to provide a method for manufacturing oil-blotting paper with excellent usability. [Means for solving the problem]

[0011] One means for solving the above problem is a method for manufacturing oil-absorbing paper, which includes a step of manufacturing oil-absorbing paper by beating oil-absorbing paper base paper, which is made from raw materials containing natural fibers using a cylinder paper machine, with a foil beating machine, wherein the step of manufacturing oil-absorbing paper by beating oil-absorbing paper includes a first step of beating the entire surface of the oil-absorbing paper base paper in the direction of orientation of the natural fibers, and a second step after the first step of beating the entire surface of the oil-absorbing paper base paper in a direction perpendicular to the direction of orientation.

[0012] The second method is as follows: The first step involves foil-beating the oil-blotting paper base along the orientation direction, then foil-beating it again along the orientation direction at a position shifted in a direction perpendicular to the orientation direction, and repeating this process until the entire surface of the oil-blotting paper base is foil-beaten; the second step involves foil-beating the oil-blotting paper base along a direction perpendicular to the orientation direction, then foil-beating it again along a direction perpendicular to the orientation direction at a position shifted in the orientation direction, and repeating this process until the entire surface of the oil-blotting paper base is foil-beaten.

[0013] In the third method, in the first and second steps, a bundle of alternating layers of oil-absorbing paper and laminated paper is tied with a band in a cross shape, and the foil stamping in the first and second steps is performed on the bundle tied with the band.

[0014] The fourth method involves placing protective paper on both outer sides in the stacking direction of a bundle in which the oil-absorbing paper base and the laminating paper are alternately stacked. Method 5 is that the basis weight of the oil-absorbing paper base is 15 g / m². 2 More than 40g / m 2 The following applies:

[0015] Method 6 involves reducing the density to 0.6 g / cm³ through the first and second steps. 3 That concludes this section. The seventh means is to make the paper thickness 50 μm or less by the first and second steps. [Effects of the Invention]

[0016] According to the method for manufacturing the oil blotting paper, an oil blotting paper excellent in usability can be manufactured.

Brief Description of the Drawings

[0017] [Figure 1] Schematic diagram of a cylinder mold paper machine. [Figure 2] Schematic diagram of a foil stamping machine. [Figure 3] Plan view showing the relative movement route of the hammer, pedestal portion, and bundled base paper. [Figure 4] Plan view showing foil stamping along the fiber orientation direction in the bundled base paper. [Figure 5] Plan view showing foil stamping along the direction perpendicular to the fiber orientation direction in the bundled base paper. [Figure 6] Plan view of the oil blotting paper base paper. [Figure 7] FIG. 7(a) and FIG. 7(b) are plan views showing a modified example of the relative movement route between the hammer and the bundled base paper.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, an embodiment of the method for manufacturing the oil blotting paper will be described. In the following description, it may be generically referred to as oil blotting paper, but when distinguishing the manufacturing stages of the oil blotting paper, different expressions may be used. Specifically, the wet paper WP that is not dried after being formed by the paper machine 10, and the one obtained by drying the wet paper WP and before foil stamping is called the oil blotting paper base paper BP. Further, after cutting the oil blotting paper base paper BP into a certain size, the oil blotting paper base paper BP and a joint paper (not shown) are alternately laminated and bundled to form the bundled base paper BS, and the one after foil stamping is called the oil blotting paper.

[0019] (Regarding the oil blotting paper) Oil-blotting paper is preferably made primarily from natural fibers. "Primary material" means that natural fibers make up 50% or more of the total fibers in the oil-blotting paper. If the proportion of natural fibers falls below 50% by mass, the oil-absorbing performance when used as oil-blotting paper may decrease. Natural fibers include plant fibers and animal fibers. Plant fibers include fibers obtained from seeds such as cotton, fibers obtained from fruits such as koiya, fibers obtained from leaves such as Manila hemp and sisal, fibers obtained from stems and bark such as flax, jute, paper mulberry, mitsumata, and bast, and wood pulp from broad-leaved and coniferous trees. Wood pulp includes kraft pulp and mercerized pulp, and pulp includes bleached pulp and unbleached pulp. Animal fibers include wool, silk, and cashmere. For oil-blotting paper, it is preferable to use bleached coniferous kraft pulp (NBKP) or Manila hemp, considering factors such as cost and smoothness.

[0020] In addition, other fibers that can be used in combination with natural fibers include regenerated fibers such as viscose rayon and cupro, semi-synthetic fibers such as acetate and Promix, and synthetic fibers such as polyester, nylon, polyethylene, vinylon, and polypropylene. When using plant fibers for oil-blotting paper, it is preferable to adjust the degree of beating to a predetermined degree, for example, SR 15 to 40 degrees, using a beating machine such as a beater.

[0021] Oil-absorbing paper preferably contains inorganic fillers such as clay, talc, kaolin, and calcium carbonate in addition to the raw material fibers to enhance oil absorption, and may also contain fixatives, antibacterial agents, fragrances, colorants, etc. These are preferably incorporated into the oil-absorbing paper by adding them to the papermaking vat along with the fiber raw materials during the papermaking process.

[0022] The basis weight (mass per square meter) of oil-blotting paper is 15 g / m². 2 More than 40g / m 2 Preferably, the basis weight is 15 g / m². 2 If the basis weight is less than 40 g / m², the paper itself becomes too thin, which can cause tearing during the foil application process. 2When it exceeds this value, the paper thickness increases, and the softness and moist feeling when using blotting paper decrease.

[0023] Also, the density of the blotting paper is preferably 0.6 g / cm 3 or more. To make the density of the blotting paper 0.6 g / cm 3 or more, foil stamping is performed on the blotting paper base paper BP by the foil stamping machine 20. Foil stamping means applying pressure to the blotting paper base paper BP in the thickness direction by the foil stamping machine 20 to increase the density of the paper. By this foil stamping, the fibers in the paper are crushed, making it easier to adsorb the skin fat.

[0024] The paper thickness of the blotting paper is preferably 50 μm or less. Although it is also related to the basis weight described above, when the paper thickness of the blotting paper exceeds this value, the softness and moist feeling when using it decrease. The opacity (%) of the blotting paper is preferably in the range of 30 to 70%. When the opacity is within this range, the paper color becomes transparent when the blotting paper absorbs fat, making it easier to visually confirm the fat absorption property. The opacity can be measured based on JIS P8149 "Paper and Paperboard - Test Method for Opacity (Backing of Paper) - Diffuse Illumination Method".

[0025] The smoothness (seconds) of the blotting paper is preferably in the range of 30 to 130 seconds. When the smoothness is within this range, the surface irregularities of the blotting paper are few, and the feel on the skin when using the blotting paper is improved. The smoothness can be measured based on JIS P8119 "Paper and Paperboard - Test Method for Smoothness by Bekk Smoothness Tester".

[0026] The moisture content (%) of the blotting paper is preferably 5.0 to 7.0%. The moisture content can be measured based on JIS P8127 "Paper and Paperboard - Test Method for Moisture in Lots - Method by Dryer".

[0027] (Regarding the cylinder mold paper machine 10) The following describes the cylinder screen paper machine 10 shown in Figure 1. In the cylinder screen paper machine 10 in Figure 1, the papermaking process generally proceeds from left to right in the diagram, so the left side is also called the upstream and the right side is called the downstream. This cylinder screen paper machine 10 is broadly composed of a wet part located on the upstream side, where the wet felt 11 carrying the wet paper WP runs, and a dry part located on the downstream side, which dries the wet paper WP and winds up the dried oil-absorbing paper base BP.

[0028] The wet part consists of a wet felt 11, one paper press tank 12, a cylindrical cylinder 13, a coot roll 14, part of a pair of press rolls 15, a headbox 16, and multiple guide rollers. A cylindrical cylinder 13 is rotatably positioned inside the paper press tank 12. The headbox 16 is located at the upstream end of the cylinder paper machine 10. A piping for supplying pulp (not shown) extends from the headbox 16 to the paper press tank 12, and pulp liquid is supplied from this piping into the paper press tank 12 from left to right in Figure 1. In Figure 1, the axis 13a of the cylindrical cylinder 13 extends in a direction perpendicular to the plane of the paper in Figure 1, and the direction of supply of pulp liquid into the paper press tank 12 is perpendicular to the axis 13a of the cylindrical cylinder 13.

[0029] The cylindrical cylinder 13 is covered endlessly with three layers of wire mesh (bottom mesh, top mesh, and outermost mesh, in order from the inner circumference) not shown, covering its entire circumference. The bottom mesh is a wire mesh formed by plain weaving metal wires, with a mesh count (number of wires per inch) of 8 to 16 meshes and a wire diameter of approximately 0.4 to 0.7 mm.

[0030] The lower screen is used to protect the upper screen, and the lower screen itself does not function as a screen. Furthermore, the lower screen creates a gap between the upper screen, which acts as the screen, and the framework of the cylindrical cylinder 13, thereby ensuring that the flow of the pulp liquid from the outside to the inside of the cylindrical cylinder 13 is not obstructed, and thus equalizing the flow of the pulp liquid on the screen surface.

[0031] An upper screen is layered and stretched over the lower screen. This upper screen functions as a papermaking screen, and as the pulp liquid passes from the outside to the inside of the cylindrical cylinder 13, the liquid passes through the mesh of this upper screen and flows into the inside of the cylindrical cylinder 13. However, most of the pulp, which is made of fibers, is filtered out without passing through the mesh of this upper screen and remains on the surface of the upper screen, resulting in the formation of wet paper WP on the upper screen.

[0032] The upper screen, like the lower screen, is made of wire mesh formed by plain weaving metal wires. Because the screen (upper screen) is circular when viewed from the side, it is called a circular screen paper machine 10. To keep the fibers attached to the surface of the upper mesh, the wire mesh used as the upper mesh has a finer mesh and thinner wire diameter than the lower mesh. Specifically, the wire mesh used as the upper mesh has a mesh count in the range of 60 to 100 mesh, and the wire diameter of the wire mesh corresponding to this mesh count range is 0.1 to 0.3 mm.

[0033] In the cylindrical cylinder 13, an additional layer of wire mesh (the top mesh) is stretched over the lower mesh and the upper mesh that forms the base mesh. The top mesh used in the cylindrical cylinder 13 is coarser than the upper mesh. Specifically, the mesh count of the wire mesh is selected according to the raw materials and basis weight of the paper being made, but the range of possible mesh counts is 5 to 40, and the wire diameter is 0.1 to 1.0 mm. In this way, by stretching a top mesh with a coarser mesh than the upper mesh on top of the upper mesh, fibers do not accumulate in the area where the top mesh is located during papermaking, and recesses are formed in the wet paper WP according to the mesh count and wire diameter of the top mesh.

[0034] A small-diameter coot roll 14 is positioned at the top of the cylindrical cylinder 13. This coot roll 14 brings the wet felt 11 into contact with the top surface of the cylindrical cylinder 13, more specifically with the wet paper WP produced in the cylindrical cylinder 13, thereby transferring the wet paper WP from the cylindrical cylinder 13 to the wet felt 11.

[0035] The wet felt 11 is a blanket formed in an endless shape, and it transports the wet paper WP picked up from the cylindrical cylinder 13 to the dry part. The wet felt 11 is driven by a drive mechanism (not shown), and the cylindrical cylinder 13 follows the movement of the wet felt 11, rotating clockwise in the figure.

[0036] The dry section consists of a portion of a pair of press rolls 15, an endless top felt 17, a Yankee dryer 18, a winding roll 19, and several guide rollers. The press rolls 15 are positioned to sandwich the wet felt 11 of the wet section and the top felt 17 of the dry section, with one of the pair of press rolls 15 belonging to the wet section and the other to the dry section. The top felt 17 is arranged so that its outer surface is in contact with the surface of the Yankee dryer 18. The wet paper WP is transferred from the wet felt 11 to the top felt 17 by the pressure of the press rolls 15, and is then dried by passing between the top felt 17 and the Yankee dryer 18. The dried oil-absorbing paper base paper BP is wound into a roll by the winding roll 19.

[0037] Although the oil-absorbing paper base paper BP dried by the Yankee dryer 18 may be subjected to high-density processing using a supercalender (not shown), a supercalender is not used in the oil-absorbing paper of this embodiment.

[0038] (Regarding the foil stamping machine 20) Figure 2 shows a schematic diagram of the foil stamping machine 20. The foil stamping machine 20 comprises a hammer 21 positioned above and a base 22 positioned below. The hammer 21 is a 16 kg belt hammer driven via a belt by a control unit and drive unit (not shown). The hammer 21 is capable of continuous up and down movement, and foil stamping is performed by striking the oil-absorbing paper base BP with the lower surface of the hammer 21. In this embodiment, the hammer 21 allows setting the number of strikes (number of strikes per minute) and the striking time (time for continuous striking). For example, the number of strikes can be set to approximately 500 times / minute, and the striking time to 105 seconds per process. The striking surface of the hammer 21 is circular in plan view, with a diameter of approximately 8 cm.

[0039] Furthermore, the base portion 22 is capable of holding a bundle of oil-absorbing paper base paper BP (hereinafter referred to as "bundle base paper BS") on its upper surface. The upper surface of the base portion 22 is a larger plane than the bundle base paper BS cut to a certain size (for example, 21 cm square), and is large enough to accommodate the bundle base paper BS even when it is placed on top. In addition, a frame extending upward is formed on the outer edge of the upper surface of the base portion 22, although this is not shown in the figure. The frame prevents the bundle base paper BS placed on the base portion 22 from falling off the upper surface of the base portion 22 even if it is struck by the hammer 21.

[0040] The base portion 22 is movable by a control unit and a drive unit (not shown) in a direction perpendicular to the vertical movement direction of the hammer 21, that is, in the left-right direction in Figure 2 and in a direction perpendicular to the plane of the figure (paper). In this embodiment, the base portion 22 is set to move relative to the hammer 21.

[0041] Figure 3 shows the movement route of the center of the hammer 21 relative to the base 22 as a dashed line. Since the bundle of base paper BS is placed on the base 22, this figure also shows the movement route of the center of the hammer 21 relative to the bundle of base paper BS during foil stamping. Hereafter, the movement route shown by the dashed line in Figure 3 and so on will also refer to the center of the hammer 21 simply as the hammer 21. As explained earlier, the foil stamping machine 20 fixes the position of the hammer 21 in plan view (Figure 3) and moves the base 22 relative to the hammer 21, so the hammer 21, the base 22 and the bundle of base paper BS on it move relative to each other. However, in Figure 3 and the explanation based on it, for the sake of explanation, the position of the base 22 is fixed and the movement route of the hammer 21 relative to the base 22 and the bundle of base paper BS is explained. Furthermore, simultaneously with the relative movement of the hammer 21 and the base 22 shown in Figure 3, the foil stamping onto the bundle of base paper BS begins with the up-and-down movement of the hammer 21 shown in Figure 2, and foil stamping is performed continuously while the relative movement of the hammer 21 and the base 22 is ongoing. The foil stamping ends at the same time that the relative movement of the hammer 21 and the base 22 ends. In the following, the explanation will focus on the relative movement route of the hammer 21 and the base 22, and the explanation of the foil stamping operation may be omitted or simplified.

[0042] The hammer 21 starts from position a, which is one of the four corners of the bundle of base paper BS placed on the base portion 22, and applies foil to the lower left corner in the diagram, moving in an uneven manner as shown in the diagram.

[0043] The movement described as "undulating" specifically refers to the following actions. In the bundle of base paper BS shown in Figures 3 to 5, the side extending left and right at the bottom of the figure is called the front side, the side located opposite the front side and extending left and right at the top of the figure is called the back side, the side extending up and down on the left side of the figure is called the left side, and the side extending up and down on the right side of the figure is called the right side. Depending on the orientation in which the bundle of base paper BS is arranged, its front and back sides or left and right sides will be oriented in line with the fiber orientation direction D of the oil-absorbing paper base paper BP. The fiber orientation direction D of the oil-absorbing paper base paper BP is also simply called "fiber orientation direction D".

[0044] As shown in Figure 3, the hammer 21 starts at position a and moves upward in the figure along the left edge of the bundle of paper BS toward position b, which is closer to the rear edge, while striking the foil. The amount of movement of the hammer 21 at this time is the amount that the hammer 21 can strike the foil including both ends of the bundle of paper BS in the direction of movement (from the front edge to the rear edge). The same applies to the amount of movement in the same direction thereafter.

[0045] When the hammer 21 reaches position b near the rear edge of the bundle of base paper BS, the hammer 21 changes its direction of movement to a perpendicular direction and moves along the rear edge of the bundle of base paper BS to position c in the right direction in Figure 3, which is the direction in which the unfoiled bundle of base paper BS is located. The amount of movement from position b to position c can be, for example, about 1 / 3 to 1 of the diameter of the hammer 21, or 1 / 2 to 1 / 5 of one side of the oil-absorbing paper base paper BP. The amount of movement in the same direction thereafter is similar. Since foiling is performed continuously, foiling may occur during this movement along the rear edge, depending on the timing.

[0046] When the hammer 21 reaches position c, it further changes its direction of movement to a perpendicular direction and stamps the foil while moving forward and downward in the diagram from position c parallel to the left edge of the bundle of paper BS, until it reaches position d, which is closer to the front edge of the bundle of paper BS.

[0047] When the hammer 21 reaches position d near the front edge of the bundle of paper BS, the hammer 21 changes its direction of movement to a perpendicular direction and moves along the front edge of the bundle of paper BS to position e in the right direction in Figure 3. After this movement, the hammer 21 changes its direction of movement again to a perpendicular direction and stamps the foil while moving parallel to the left edge of the bundle of paper BS from position e toward the rear, until it reaches position f near the rear edge of the bundle of paper BS.

[0048] Hammer 21 continues to stamp the bundle of base paper BS while repeating the same movement (positions fghijkl in Figure 3). When hammer 21 reaches position l, the entire surface of the bundle of base paper BS is stamped. Next, hammer 21 moves back along the same route as before, starting from position l, and stamps the bundle of base paper BS, returning to the previous starting point, position a. As a result, hammer 21 stamps the bundle of base paper BS by making one round trip in an uneven pattern along the route shown by the dashed line in Figure 3: position a → position l → position a. Stamping the bundle of base paper BS is performed continuously for a predetermined time, for example 105 seconds, during which time the hammer moves along the above-described route, making 6 to 7 round trips, with position a → position l → position a counting as one round trip.

[0049] As described above, the hammer 21 performs foil stamping by moving back and forth in an uneven pattern on the bundle of base paper BS as shown in Figure 3. In this embodiment, the movement route of the hammer 21 is this single pattern. Here, we will explain the relationship between the movement route of the hammer 21 and the fiber orientation direction D in the oil-absorbing paper base BP that is beaten by the hammer 21.

[0050] As shown in Figure 4, when the bundle of base paper BS is placed on the base portion 22 such that the vertical direction in the figure is the fiber orientation direction D of the oil-absorbing paper base paper BP, the front and rear edges of the bundle of base paper BS shown in Figure 4 are located perpendicular to the fiber orientation direction D of the oil-absorbing paper base paper BP. Also, the left and right edges of the bundle of base paper BS are located along the fiber orientation direction D of the oil-absorbing paper base paper BP. In Figure 4, the fragmentary lines extending vertically in the bundle of base paper BS represent the fibers of the oil-absorbing paper base paper BP, and the direction in which the fibers extend (vertical direction in the figure) is the fiber orientation direction D of the oil-absorbing paper base paper BP in the bundle of base paper BS shown in Figure 4. Therefore, when the hammer 21 is moved in the front-back direction (position a→b, position c→d, etc.) while the bundle of base paper BS is oriented as shown in Figure 4, the oil-absorbing paper base paper BP of the bundle of base paper BS will be foil-beaten along the fiber orientation direction D between the front and rear edges.

[0051] On the other hand, as shown in Figure 5, when the bundle of base paper BS is placed on the base portion 22 such that the left-right direction in the figure is the direction D of the fiber orientation of the oil-absorbing paper base paper BP, the front and rear edges of the bundle of base paper BS shown in Figure 5 are located along the direction D of the fiber orientation of the oil-absorbing paper base paper BP. Also, the left and right edges of the bundle of base paper BS are located perpendicular to the direction D of the fiber orientation of the oil-absorbing paper base paper BP. Note that the fragmentary lines extending in the left-right direction in Figure 5 shown in the bundle of base paper BS represent the fibers of the oil-absorbing paper base paper BP, and the direction in which the fibers extend (left-right direction in the figure) is the direction D of the fiber orientation of the oil-absorbing paper base paper BP in the bundle of base paper BS shown in Figure 5. Therefore, when the hammer 21 is moved in the front-back direction (position a→b, position c→d, etc.) while the bundle of base paper BS is oriented as shown in Figure 5, the oil-absorbing paper base paper BP of the bundle of base paper BS will be foil-beaten along the direction perpendicular to the fiber orientation D between the front and rear edges.

[0052] Therefore, as shown in Figures 4 and 5, changing the orientation of the bundle of base paper BS placed on the base portion 22 by 90 degrees results in a different fiber orientation direction D in the oil-absorbing paper base paper BP of the bundle of base paper BS. Consequently, the foil beating by the hammer 21, which follows the same movement route, will result in either foil beating the entire surface of the oil-absorbing paper base paper BP along the fiber orientation direction D (Figure 4), or foil beating the entire surface of the oil-absorbing paper base paper BP along a direction perpendicular to the fiber orientation direction D (Figure 5).

[0053] (Regarding the manufacturing method of oil-blotting paper) The following describes the manufacturing method of oil-blotting paper. Manufacturing of BP base paper for oil-blotting paper The cylinder paper machine 10 shown in Figure 1 is used to manufacture oil-absorbing paper base paper BP. Figure 6 shows an unfolded plan view of the oil-absorbing paper base paper BP before cutting. In Figure 6, the fragmentary lines extending horizontally in the bundle of base paper BS represent fibers, and the direction in which the fibers extend (horizontal direction in the figure) is the formation direction of the oil-absorbing paper base paper BP shown in Figure 6, and is also the fiber orientation direction D. The vertical direction in the figure is perpendicular to the paper formation direction and the fiber orientation direction D. Before cutting, the oil-absorbing paper base paper BP has a width of, for example, 90 cm in the direction perpendicular to the paper formation direction, and the paper formation direction, which is horizontal in the figure, has an almost endless length, and after manufacturing it is wound into a roll.

[0054] Next, the oil-absorbing paper base paper BP is cut to a uniform size (for example, 21 cm square) along the fiber orientation direction D and the direction perpendicular to it. The cut oil-absorbing paper base paper BP and laminated paper of the same size are stacked alternately to form a total of 680 sheets (340 sheets of oil-absorbing paper base paper BP and 340 sheets of laminated paper). The fiber orientation direction D of the stacked oil-absorbing paper base paper BP is aligned in the same direction.

[0055] Furthermore, after laminating both layers, 20 sheets of protective paper are laminated to the outer edges on both sides in the lamination direction. The protective paper can be the same paper as the laminated paper, and kraft paper is preferred. This forms a bundle of base paper BS consisting of 20 sheets of protective paper on each side in the lamination direction, and 680 sheets of alternately laminated oil-absorbing paper base paper BP and laminated paper, for a total of 720 sheets. The outer circumference of this bundle of base paper BS is wrapped and tied in a cross shape with a band (not shown) to secure it.

[0056] The band that binds the outer circumference of the bundle of base paper BS in a cross shape is preferably made of a tough material that will not be damaged even when repeatedly struck by the hammer 21 during foil stamping, for example, OPP (biaxially oriented polypropylene) resin can be used. In addition, even if the band is not mentioned below, the bundle of base paper BS will be stamped while bound in a cross shape by the band.

[0057] Next, the first step is performed. The bundle of base paper BS is placed on the base 22 of the foil beating machine 20. At this time, the bundle of base paper BS is placed so that the fiber orientation direction D of the oil-absorbing paper base paper BP is facing the front-to-back direction shown in Figure 3, that is, in the orientation shown in Figure 4. An arrow indicator showing the fiber orientation direction D is attached to the band that binds the bundle of base paper BS. When placing the bundle of base paper BS on the base 22, this indicator can be used as a guide to determine the fiber orientation direction D. In this state, the hammer 21 moves back and forth along the movement route shown by the dashed line in Figure 4 (position a→l, position l→a) to foil bead the bundle of base paper BS. In this first step, the bundle of base paper BS is placed so that the fiber orientation direction D of the oil-absorbing paper base paper BP is facing the front-to-back direction in Figure 4. Therefore, the hammer 21 moves between one end (front end) and the other end (rear end) of the oil-absorbing paper base BP along the fiber orientation direction D (position a→b, position c→d, position e→f, etc.) while performing the foil beating. The first process ends when the operation of the hammer 21 reaches a predetermined time.

[0058] Next, the second step is performed. The bundle of base paper BS is temporarily removed from the base 22, rotated 90 degrees as shown in Figure 5, and placed back on the base 22. In this state, the hammer 21 is used to strike the bundle of base paper BS under the same conditions as in the first step. The hammer 21 similarly strikes the bundle of base paper BS while moving along the dashed route (position a→l) shown in Figure 5. However, in the second step, the orientation of the oil-absorbing paper base paper BP has been rotated 90 degrees compared to the first step, and the orientation direction D of the fibers of the oil-absorbing paper base paper BP is the left-right direction in Figure 5. Therefore, the hammer 21 strikes the oil-absorbing paper base paper BP while moving between one end (front end) and the other end (rear end) of the oil-absorbing paper base paper BP along a direction perpendicular to the orientation direction D of the fibers of the oil-absorbing paper base paper BP (position a→b, position c→d, position e→f, etc.). When the operation of the hammer 21 reaches a predetermined time, the second step of foil stamping the entire surface of the oil-absorbing paper base BP of the bundle base paper BS in a direction perpendicular to the fiber orientation direction D is completed.

[0059] After completing the first and second processes, the blotting paper base paper BP from the bundled base paper BS becomes high-density blotting paper. Then, the band of the bundled base paper BS is removed, the protective paper and interleaving paper are removed, and the blotting paper is cut to product size (9cm square). A certain number of blotting papers are bundled together and stored in a storage case, or a cover is added and they are bound to form a finished product.

[0060] According to the method for manufacturing oil-blotting paper of the above embodiment, the following effects can be obtained. (1) In the above embodiment, the first step is to bead the entire surface of the oil-absorbing paper base paper BP of the bundled paper BS in the direction of fiber orientation D (position a→b, position c→d, position e→f, etc.) with the hammer 21 of the foil beading machine 20. After the first step, there is a second step in which the entire surface of the oil-absorbing paper base paper BP of the bundled paper BS is beaded in a direction perpendicular to the direction of fiber orientation D (position a→b, position c→d, position e→f, etc.). In the first step, the entire surface of the oil-absorbing paper base paper BP of the bundled paper BS is beaded along the direction of fiber orientation D, and in the second step, the entire surface of the oil-absorbing paper base paper BP of the bundled paper BS is beaded along a direction perpendicular to the direction of fiber orientation D. As a result, the smoothness of the beaded oil-absorbing paper is increased, improving the feel in use and also improving the oil-absorbing effect.

[0061] (2) In the first step, the hammer 21 moves the bundle of base paper BS in the direction of the fiber orientation D of the oil-absorbing paper base paper BP while beating it (position a→b in Figure 4), then moves in a direction perpendicular to the direction of the fiber orientation D (position b→c), and then beats the paper again while moving in the direction of the fiber orientation D (position c→d). Furthermore, the same movement is repeated to beat the entire bundle of base paper BS. Therefore, the density of beating the bundle of base paper BS in the first step can be adjusted by adjusting the distance the hammer 21 moves in the direction perpendicular to the direction of the fiber orientation D of the oil-absorbing paper base paper BP (position b→c, position d→e, etc.).

[0062] (3) In the second step, the hammer 21 moves the bundle of base paper BS in a direction perpendicular to the fiber orientation direction D of the oil-absorbing paper base paper BP while applying foil (position a→b in Figure 5), and then moves in the direction of fiber orientation D (position b→c). It also applies foil while moving in a direction perpendicular to the fiber orientation direction D (position c→d). Furthermore, the same movement is repeated to apply foil to the entire bundle of base paper BS. Therefore, the density of foil application in the second step to the bundle of base paper BS can be adjusted by adjusting the distance the hammer 21 moves in the direction of fiber orientation D of the oil-absorbing paper base paper BP (position b→c, position d→e, etc.).

[0063] (4) The bundle of base paper BS has protective paper placed on both outer sides in the stacking direction. As a result, the oil-absorbing paper base paper BP does not come into direct contact with the hammer 21 or the base portion 22, and damage to the oil-absorbing paper base paper BP during foil stamping can be prevented.

[0064] (5) The outer edge of the bundle of base paper BS is bound in a cross shape with a strip of OPP (biaxially oriented polypropylene) resin or the like. Therefore, the strip is less likely to be damaged even when repeatedly struck by the hammer 21 during foil stamping.

[0065] (6) The surface of the band binding the bundle of base paper BS is marked with an arrow indicator showing the fiber orientation direction D. This allows the fiber orientation direction D to be determined by using the indicator as a guide when placing the bundle of base paper BS on the base 22, and enables the correct orientation of the bundle of base paper BS during foil stamping.

[0066] The above embodiment may be modified as follows. The hammer 21 performed the first and second foil-beating processes while moving relative to the bundle of base paper BS along the movement route shown in Figure 3, but it is not limited to this. For example, as shown in Figure 7(a) which illustrates the relative movement route between the hammer 21 and the bundle of base paper BS, the hammer 21 moves upward along the left edge of the bundle of base paper BS to perform the first foil-beating, and then moves in a perpendicular direction for a distance greater than the diameter of the hammer 21. Note that in Figure 7(a), the movement in the perpendicular direction is illustrated as an arc with a dashed line, which is for the sake of explanation. Then, the hammer 21 moves downward in the figure to perform the next foil-beating, and then moves in a perpendicular direction for a distance greater than the diameter of the hammer 21. After the hammer 21 reaches the right edge of the bundle of base paper BS, the hammer 21 moves in the opposite direction of the previous movement in the perpendicular direction, and moves upward to beat the unbeaten areas of the bundle of base paper BS, thereby beaten the entire surface of the oil-absorbing paper BP of the bundle of base paper BS. In this case as well, depending on the orientation of the stack of base paper BS, foil stamping can be performed in the same direction as foil stamping in the direction perpendicular to the fiber orientation direction D of the base paper BP for oil-absorbing paper.

[0067] Furthermore, as shown in Figure 7(b), the hammer 21 first strikes the foil along the left edge of the bundle of base paper BS in an upward direction in the figure. Then, the hammer 21 stops striking the foil and moves diagonally downward to the right in the figure, striking the foil again from the point to the right of the starting point of the previous strike, moving upward in the figure. This process can be repeated to strike the entire surface of the oil-absorbing paper base paper BP on the bundle of base paper BS. In this case as well, depending on the orientation of the bundle of base paper BS on which it is placed, it is possible to strike the foil along the fiber orientation direction D of the oil-absorbing paper base paper BP and also strike the foil in a direction perpendicular to that direction.

[0068] Although a single layer of oil-absorbing paper base BP was produced using the cylinder paper machine 10, two layers of oil-absorbing paper base BP may be produced by using two paper vats 12. • Flavorings, colorings, etc. may be added to the raw materials.

[0069] The foil stamping machine 20 is configured such that the position of the hammer 21 is fixed and the base 22 is movable, but it is not limited to this configuration. The hammer 21 may be movable and the position of the base 22 may be fixed. Alternatively, both the hammer 21 and the base 22 may be movable.

[0070] Although protective paper was used on both outer sides in the stacking direction of the bundled base paper BS, this can be omitted, and the bundled base paper BS may consist only of oil-absorbing paper BP and laminating paper. The number of protective paper sheets may also be increased or decreased. Furthermore, a different type of paper, such as cardboard, may be used as protective paper.

[0071] The weight of Hammer 21, the size and shape of the striking surface, and the time spent striking the foil may be changed. The thermoplastic resin band used to bind the bundle of base paper BS does not need to be torn or damaged during the foil stamping process, and materials other than thermoplastic resin can be used. Also, the indication of the fiber orientation direction D on the band is not limited to arrows; it may be a simple line, triangle, or other symbol or letter.

[0072] (Examples) The following describes specific examples. Manufacturing of oil-blotting paper according to the example The following raw materials, inorganic fillers, and fixatives were used.

[0073] Raw materials Manila hemp (beating degree SR30 degrees) 100 parts by mass Inorganic filler microtalc 20 parts by mass Fixative: Filex RC-104 0.5% by mass (relative to 100% by mass of raw material) Fixative: Filex M 0.3% by mass (relative to 100% by mass of raw material) Manila hemp was beaten to the above degree using a beater, and microtalc was mixed with the Manila hemp to form a uniform dispersion. Then, Filex RC-104 and Filex M (both manufactured by Meisei Chemical Industry Co., Ltd.) were used as fixatives to fix the microtalc to the fibers, and this pulp was used to make paper using the cylinder screen paper machine 10 shown in Figure 1.

[0074] The cylinder paper machine 10 has a single vat 12, and the cylindrical cylinder 13 has a bottom screen with a 16 mesh diameter and 0.5 mm wire size, a 90 mesh diameter and 0.16 mm wire size, and an upper screen with a 0.2 mm diameter and 16 mesh wire size, stacked from the inside. Basis weight: 22 g / m² 2 After forming wet paper WP with an uneven layer on one side, it was dried in a Yankee dryer 18 to obtain oil-absorbing paper base paper BP. The oil-absorbing paper base paper BP was not subjected to supercalendering and was wound into a roll shape on a winding roll 19 after drying.

[0075] (Manufacturing of oil-absorbing paper BP using foil beating machine 20) Next, the oil-absorbing paper base paper BP was cut into 21 cm squares, and 340 sheets of the cut oil-absorbing paper base paper BP were alternately stacked with 340 sheets of laminated paper of the same size (total of 680 sheets). In addition, 20 sheets of protective paper were laminated on each side of the stacking direction to form a bundle of base paper BS totaling 720 sheets (340 sheets of oil-absorbing paper base paper BP, 340 sheets of laminated paper, and 20 sheets of protective paper x 2). When manufacturing the bundle of base paper BS, the fiber orientation direction D of the oil-absorbing paper base paper BP was aligned in the same direction during stacking. Kraft paper was used for the laminated paper. The outer circumference of this bundle was secured by binding it with strip paper in a cross shape.

[0076] As shown in Figure 4, the bundled base paper BS (the strip paper is not shown) was placed on the base 22 so that the vertical direction in the figure was the direction D of the fiber orientation of the oil-absorbing paper base paper BP. The bundled base paper BS was then struck with a belt-type hammer 21 weighing 16 kg at a rate of approximately 500 times / minute for 105 seconds. The striking surface of the hammer 21 is circular in plan view, with a diameter of approximately 8 cm. The hammer 21 moved relative to the bundled base paper BS along the movement route shown in Figure 4 (first step). In this first step, the entire surface of the oil-absorbing paper base paper BP on the bundled base paper BS was struck along the direction D of the fiber orientation. In 105 seconds, the hammer 21 made 6 back-and-forth movements on the bundled base paper BS between position a and position l.

[0077] After completing the first step, the orientation of the bundle of base paper BS was changed by 90 degrees and placed on the base portion 22 so that the vertical direction in the figure was perpendicular to the fiber orientation direction D of the oil-absorbing paper base paper BP, as shown in Figure 5, and foil stamping was performed under the same conditions as the first step (second step). In this second step, the entire surface of the oil-absorbing paper base paper BP of the bundle of base paper BS was foil-stamped in a direction perpendicular to the fiber orientation direction D. The oil-absorbing paper after completing the first and second steps was cut into 9 cm squares to become the oil-absorbing paper of the embodiment (hereinafter simply referred to as "the embodiment").

[0078] Manufacturing of oil-blotting paper for comparative example The oil-blotting paper of the comparative example is manufactured in the same way as the example up to the bundle base paper BS, with only the foil-beating method being different. The bundle base paper BS manufactured in the same way as the example was first foil-beaten across the entire surface of the oil-blotting paper base paper BP in a direction perpendicular to the fiber orientation direction D (second step of the example), and then foil-beaten across the entire surface of the oil-blotting paper base paper BP in the fiber orientation direction D (first step of the example). After these steps, the oil-blotting paper was cut into 9 cm squares to become the oil-blotting paper of Comparative Example 1 (hereinafter simply referred to as "Comparative Example 1").

[0079] Furthermore, the bundled base paper BS, manufactured in the same manner as in the example, was foil-stamped across the entire surface of the oil-absorbing paper base paper BP along the fiber orientation direction D (first step in the example), and then foil-stamped again across the entire surface of the oil-absorbing paper base paper BP along the fiber orientation direction D (first step in the example). In other words, the first step in the example was repeated twice. The oil-absorbing paper after these steps was cut into 9 cm squares to become the oil-absorbing paper of Comparative Example 2 (hereinafter simply referred to as "Comparative Example 2").

[0080] Furthermore, the bundled base paper BS, manufactured in the same manner as in the example, was foil-stamped across the entire surface of the oil-absorbing paper base paper BP in a direction perpendicular to the fiber orientation direction D (second step in the example), and then foil-stamped again across the entire surface of the oil-absorbing paper base paper BP in a direction perpendicular to the fiber orientation direction D (second step in the example). In other words, the second step in the example was repeated twice. The oil-absorbing paper after these steps was cut into 9 cm squares to become the oil-absorbing paper of Comparative Example 3 (hereinafter simply referred to as "Comparative Example 3"). The number of foil-stamping sessions, time, and other conditions were the same as in the example for Comparative Examples 1 to 3.

[0081] For each of the examples and comparative examples (5 sheets), the basis weight, paper thickness, density, opacity, smoothness, and moisture content were measured. The average results are shown in Table 1. Note that paper thickness, opacity, and smoothness were measured at arbitrary points on the paper.

[0082] [Table 1] Table 1 shows that the examples had higher smoothness than each of the comparative examples, but there was no difference in density between the examples and each of the comparative examples. Generally, as the smoothness of paper increases, the density also increases, but although the examples had higher smoothness than each of the comparative examples, there was not much difference in density. Comparative Example 3 had the highest smoothness among the comparative examples, but the density was low.

[0083] This means that the examples have a higher surface smoothness than each comparative example while maintaining a similar degree of gaps between the fiber structure. Therefore, from the results in Table 1, it can be said that the examples have a uniformly processed surface of oil-blotting paper, making it pleasant to the touch, and also have sufficient internal gaps, resulting in high oil penetration into the oil-blotting paper.

[0084] Next, sensory tests were conducted on the texture and oil removal effectiveness of the Example and Comparative Example 1. The testers consisted of 8 people in total: 6 women and 2 men. The age distribution was 1 person each in their 20s, 30s, and 60s, 2 in their 40s, and 3 in their 50s. The testers applied the oil-blotting papers of Example and Comparative Example 1 to their cheeks and evaluated the texture and oil removal effectiveness as good, average, or bad. Note that the oil removal effectiveness was subjective to the user. The results are shown in Table 2.

[0085] [Table 2] The results in Table 2 show that the Example was better than Comparative Example 1 in both skin feel and oil removal, indicating that the Example had superior usability. [Explanation of symbols]

[0086] 10... Cylinder paper machine 11…Wet felt 12…Shoto tank 13…Cylindrical cylinder 14... Kouchi Roll 15… Press Roll 16…Headbox 17…Top felt 18... Touch Roll 19... Yankee hair dryer 20… Foil stamping machine 21... Hammer 22... Base WP…Wet paper BP... Oil-blotting paper base BS…Bundle base paper (bundle) D...Fiber orientation direction.

Claims

1. This process includes manufacturing oil-absorbing paper by using a cylinder paper machine to produce oil-absorbing paper base paper from raw materials containing natural fibers, and then using a foil beating machine to apply foil to the base paper. The process of manufacturing oil-blotting paper by applying foil as described above is, A first step involves foil-beating the entire surface of the oil-absorbing paper base along the orientation direction of the natural fibers, The process includes, after the first step, a second step of foil stamping the entire surface of the oil-absorbing paper base along a direction perpendicular to the orientation direction, A method for manufacturing oil-blotting paper.

2. The first step involves foil-beating the oil-blotting paper base along the orientation direction, then foil-beating it again along the orientation direction at a position shifted perpendicular to the orientation direction, and repeating this process to foil-beat the entire surface of the oil-blotting paper base. The second step involves foil-beating the oil-blotting paper base in a direction perpendicular to the orientation direction, then foil-beating the oil-blotting paper base in a direction perpendicular to the orientation direction at a position shifted in the orientation direction, and repeating this process until the entire surface of the oil-blotting paper base is foil-beaten. A method for producing oil-blotting paper according to claim 1.

3. In the first and second steps, The aforementioned oil-absorbing paper base and laminated paper are layered alternately in a bundle, and then tied together with a band in a cross shape. A method for manufacturing oil-blotting paper according to claim 1 or claim 2, wherein the first and second steps of foil stamping are performed on a bundle bound with the aforementioned band.

4. A method for manufacturing oil-absorbing paper according to claim 1 or claim 2, wherein protective paper is arranged on both outer sides in the stacking direction of a bundle in which the oil-absorbing paper base and laminating paper are alternately stacked.

5. The aforementioned oil-absorbing paper has a basis weight of 15 g / m². ２ 40g / m or more ２ The method for producing oil-blotting paper according to claim 1 or claim 2, which is as follows:

6. The density is reduced to 0.6 g / cm³ through the first and second steps. ３ The method for producing oil-blotting paper according to claim 1 or claim 2, wherein the above is correct.

7. A method for producing oil-absorbing paper according to claim 1 or claim 2, wherein the paper thickness is 50 μm or less by the first and second steps.

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