JP2022070739A - Industrial wiper - Google Patents

Abstract

To provide an industrial wiper hardly causing ply separation, and having further enhanced wiping property of a deposit with high viscosity and absorption performance of a liquid with low viscosity.SOLUTION: An industrial wiper 1 in which a plurality of sheets 10 having pulp as the main raw material are laminated is integrated by recesses and projections by embossing. The industrial wiper is such that: a basis weight of each sheet is 15-30 g/m2; the recesses and projections are single embossment in which only recesses 20 are formed on one surface and only projections 21 corresponding to the recesses are formed on the other surface; a planar view shape of the recess has a pair of parallel peripheries 40, 50; the peripheries have a form of being arranged at an angle of 50-60 degrees to the longitudinal direction; and a depth of the recess is 0.7-1.3 mm.SELECTED DRAWING: Figure 1

Description

The present invention relates to industrial wipes, particularly industrial wipes having irregularities due to embossing.

Industrial wipes are used to wipe off dust, dust, chemicals, water, oil, etc. adhering to various industrial products, research instruments, and parts used for these.
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In addition, industrial wipes are used for wiping products, appliances, parts, etc. with complicated shapes, and since it is assumed that the wiping operation is performed by rubbing many times, the wipes follow complicated shapes. Suppleness and durability are required.

By the way, industrial wipes are mainly made of non-woven fabric and paper. In particular, the paper material is made by laminating and integrating multiple thin paper base materials such as crepe paper with a thin paper thickness from the above-mentioned usage mode of industrial wipes, and thinning each layer to make the whole. By making it thicker, it ensures suppleness and durability.

On the other hand, in the industrial wipe of this paper material, unevenness is formed by embossing so that each layer does not shift at the time of wiping, and each layer is laminated and integrated.

Conventionally, many industrial wipes made of paper material are often embossed, which is also called pin embossing, so that each layer is not separated even if a rubbing operation is performed. Pin embossing is to emboss a laminated sheet with a large number of sharp pin-shaped protrusions formed on the peripheral surface of the embossed roll, and this pin-embossed industrial wipe has a large number of pin-shaped protrusions. It is said that the ply is difficult to peel off because it is strongly pressed by the convex portion of the embossed part and a concave portion close to the hole penetrating the paper surface is formed, and it is excellent in wiping off fine dust and dirt.

Japanese Unexamined Patent Publication No. 2015-195846 Japanese Unexamined Patent Publication No. 2005-160654 Japanese Unexamined Patent Publication No. 2005-245913 Japanese Patent Application Laid-Open No. 2003-116761 Japanese Unexamined Patent Publication No. 2002-238822

However, since the pin-embossed industrial wipe has a small recessed area, it is not excellent in the ability to wipe off highly viscous grease, etc., and in particular, the highly viscous grease adhering to the flat surface portion, etc. Is difficult to wipe off at once.

On the other hand, some industrial wipes have irregularities formed by embossing by embossing rolls having convex portions having a larger top area than pin embossing.

However, when the area of the top of the convex portion becomes large, the portion where the fiber is pushed and becomes dense increases, so that the absorption performance such as the absorption rate and the absorption amount of a liquid having a low viscosity, for example, the absorption amount may deteriorate.

There is a method to increase the paper density in order to improve the wiping performance and absorption performance of grease with high viscosity, but increasing the paper density increases the cost because the required fiber raw material increases. It is also conceivable to deepen the depth of the concave portion or increase the height of the convexity by embossing, but if excessively deep or high unevenness is formed, it becomes bulky, which is not preferable from the viewpoint of delivery and storage. In many cases.

Therefore, the main problem of the present invention is an industry in which the ply is difficult to peel off, the wiping property of highly viscous deposits such as grease, and the absorption performance of low-viscosity liquids such as water are further enhanced, and the volume is not excessively bulked. To provide wipes for you.

The means for solving the problems of the present invention are as follows.

The first means is
It is an industrial wipe in which multiple sheets made of pulp as the main raw material are laminated and integrated by embossing unevenness.
The basis weight of each sheet is 15 to 30 g / m ² .
The unevenness is a single emboss in which only a concave portion is formed on one surface and only a convex portion corresponding to the concave portion is formed on the other surface.
The plan view shape of the concave portion has a pair of parallel edges, the edges of which are arranged at an angle of 50 to 60 degrees with respect to the vertical direction, and the depth of the concave portion is determined. 0.7-1.3 mm,
It is an industrial wipe characterized by this.

The second means is
The plan view shape of the recess is an industrial wipe according to the first means, wherein the concave has another pair of parallel edges and is arranged so that the other pair of parallel edges are vertically parallel. be.

The third means is
The concave portion is an industrial wipe according to the first or second means, wherein the shape in a plan view is a parallelogram or a parallelogram with rounded corners.

The fourth means is
The recess is an industrial wipe according to the third means, wherein the pair of parallel edges of adjacent recesses are arranged so as to be located in a straight line.

The fifth means is
The industrial wipe according to the first to fourth means, wherein the total area ratio of the bottom of the recess is 60% or more and the surface area ratio is 110% or more.

According to the present invention, it is difficult to peel off the ply, the wiping property of highly viscous deposits such as grease, and the absorption performance of low-viscosity liquids such as water are further enhanced, and an industrial wipe that does not become excessively bulky can be obtained. Provided.

It is a plan view which shows the concave side of the industrial wipe which concerns on embodiment of this invention, the enlarged view of part A, and the sectional view (B)-(B). It is a figure for demonstrating the method of measuring the depth of a recess which concerns on this invention. It is a back view which shows the convex side of the industrial wipe which concerns on embodiment of this invention. It is a top view for demonstrating the shape and arrangement of the recesses of the comparative example 2. FIG.

Then. An embodiment of the industrial wipe of the present embodiment will be described with reference to the drawings.

In the industrial wipe 1 of the present embodiment, four sheets 10 made of pulp as a main raw material are laminated and integrated by embossing unevenness 20 and 21. The number of layers is not limited, but when it is 3 plies to 5 plies, it is easy to develop sufficient strength and it is easy to make it supple.

The sheet 10 of the present embodiment is a paper formed by making a fiber raw material by wet paper making, and is different from a non-woven fabric. This sheet is a crepe paper or a thin paper on which at least one of a dry crepe and a wet crepe is formed. The crepe rate is not particularly limited.

The type of pulp that is the main raw material of the sheet is not limited, but unbleached or bleached kraft pulp such as LUKP, LBKP, NUKP, and NBKP is desirable. In this case, it is desirable to add a high amount of pulp derived from coniferous trees called N pulp to 50% or more, particularly 90% or more. Since N pulp has a long fiber length, paper dust is unlikely to be generated. Further, used paper pulp may be blended.

The blending ratio of pulp in the fiber raw material is 90% by mass or more, preferably 100% by mass. Examples of fibers other than pulp include non-wood pulp such as Kenaf pulp and Manila hemp, and synthetic fibers such as polyester fiber, rayon fiber and acrylic fiber.

The basis weight of the sheet in the industrial wipe of the present embodiment is 15 to 30 g / m ² , preferably 15 to 20 g / m ² . The measurement of the basis weight is based on the method of measuring the basis weight of JIS P 8124 (1998).

The paper thickness of the industrial wipe of the present embodiment is preferably 350 to 550 μm, preferably 400 to 500 μm. With this paper thickness, it is not overly bulky. Here, the method for measuring the paper thickness is as follows: the test piece is sufficiently humidity-controlled under the conditions of JIS P 8111 (1998) (usually about 8 hours), and then the dial thickness gauge (thickness measuring instrument) is used under the same conditions. It shall be measured in the state of 1 ply using "PEACOCK G type" (manufactured by Ozaki Seisakusho). Specifically, make sure that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to set the zero point, and then set the zero point. , Raise the plunger, place the sample on the test table, slowly lower the plunger and read the gauge at that time. When measuring, make sure that one concave portion and convex portion are within the range of the measuring table. If there are recesses with different depths, the recess with the deepest depth should be located. At the time of this measurement, the plunger is only put on and not pressed. The terminal of the plunger is made of metal so that a circular plane having a diameter of 10 mm hits the paper plane perpendicularly, and the load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value obtained by performing the measurement 10 times.

On the other hand, in the industrial wipe according to the present embodiment, the unevennesses 20 and 21 by embossing are formed such that only the concave portion 20 is formed on one surface and only the convex portion 21 corresponding to the concave portion is formed on the other surface. It is a form of single embossing that is arranged. By using this single embossing, the scraping property of a particularly highly viscous liquid is improved. The unevenness due to embossing may be either a steel rubber method or a steel match method, but it is desirable to form the unevennesses 20 and 21 by embossing the steel match method in which the edges of the concave portions are easily clarified.

The plan view shape of the recess 20 can be various depending on the usage and preference of the consumer, but in the industrial wipe 1 according to the present embodiment, at least the plan view shape of the recess is a pair of parallel. It has an edge, and the edge is arranged at an angle of 50 to 60 degrees with respect to the vertical direction. Particularly preferably, it is 54 to 56 degrees.

In the illustrated form, as a preferred form, the plan view shape of each recess 20 is a parallelogram with rounded corners at corners 30, 30 ... In particular, a pair of parallel edges 40 of the recess 40. 40 are arranged so as to have an angle ∠α of 50 to 60 degrees with respect to the vertical direction of the sheet. The curvature of the corners of the rounded parallelogram is not particularly limited. A mere parallelogram may be used instead of a rounded parallelogram, but the curved corners reduce the risk of paper breakage during use.

Here, the vertical MD and the horizontal CD in the present invention and the embodiment are the vertical direction and the horizontal direction of the paper. When manufacturing a continuous sheet from a raw roll, the vertical MD coincides with the transport direction at the time of manufacture, and the horizontal CD coincides with the direction orthogonal to the transport direction at the time of manufacture. In the sheet 10 of the crepe paper, the fibers are oriented along the vertical direction, and the ridges of the crepe are arranged along the horizontal CD. When the edges 40, 40 of the recess 20 are arranged so as to be 50 to 60 degrees with respect to this fiber orientation and the extending direction of the crepe ridge, the fiber orientation is slightly higher than the extending direction of the crepe ridge. The edges are arranged close to each other in the direction along the sex, and the fiber division and the crepe division are well-balanced. As it becomes, it becomes superior in suppleness,

Further, it is desirable that the plan view shape of the recess 20 has another pair of parallel edges 50, 50, and the edges are arranged so as to be parallel in the vertical direction. Since the edge of the recess 20 extends in a direction perpendicular to the extending direction of the crepe, the crepe is easily broken and suppleness is easily exhibited. Further, when commercializing an industrial wipe, when it is folded in half or in four, it is easy to bend along the edge of the recess 20 and the workability is improved.

In the industrial wipe of the present embodiment, as described above, the shape of the concave portion in a plan view is a parallelogram with rounded corners, and a pair of parallel edges 40, 40 are 50 to 60 degrees with respect to the vertical direction of the sheet. The angle ∠α, and the other pair of parallel edges 50, 50 are vertically parallel. Since the recess 20 has a corner portion 30 and a pair of substantially linear edges 40 and 50, it is easy to scrape off dust, dust, and grease, and it is easy to take it into the recess. Further, in particular, the recess 20 has not a square or a rectangle but two types of corners having a substantially acute angle and a substantially obtuse angle, and can effectively wipe off wiped objects having different properties such as various viscous greases. For example, it is excellent in wiping property of both a highly viscous liquid corresponding to a consistency of 175 or more in grease and a low-viscosity liquid corresponding to a consistency of 355 or more in grease.
It should be noted that which of the pair of edges is longer is not always limited. The ratio of the lengths of the pair of parallel edges in the recess 20 is also not limited, but the recess should not be overly elongated and should be in the range 3: 1 to 1: 3.

Further, in the industrial wipe of the present embodiment, as shown in FIG. 1, it is desirable that the pair of parallel edges 40 and 50 of the adjacent recesses 20 are arranged so as to be positioned in a straight line. .. The recesses 20 are evenly arranged to reduce unevenness during wiping and liquid absorption.

Here, as a more preferable specific shape of one recess 20, the distance L1 between a pair of parallel edges having an angle ∠α of 50 to 60 degrees with respect to the vertical direction of the sheet is 5 to 10 mm, and the other. The distance L2 between the pair of parallel edges is 10 to 20 mm. In particular, a parallelogram with rounded corners at this interval is preferable. If the recess 20 has this size, the edge of the recess 20 scrapes off a highly viscous liquid such as grease during the wiping operation, making it easier for the recess 20 to enter the recess 20, and the wiping property of the highly viscous liquid is enhanced.

Further, in the industrial wipe of the present embodiment, the depth of the recess 20 is 0.7 to 1.3 mm. If the depth of the recess is less than 0.7 mm, the scraping property of a highly viscous liquid will not be sufficiently exhibited. If it exceeds 1.3 mm, in the case of the single embossed form, the bulk and thickness become too high, which is not desirable from the viewpoint of storage and transportability.

The depth of the recess by embossing is measured by the one-shot 3D measurement macroscope VR-3200 manufactured by Keyence Co., Ltd. or its equivalent, and the image analysis software "VR-H1A" or its equivalent software. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 24 mm × 18 mm. However, the magnification and the viewing area can be appropriately changed depending on the size of the recess 20. The specific measurement procedure will be described with reference to FIG. 4. A line that crosses the longest part of the peripheral edge of one recess 20 in the image portion (X portion in the figure) shown from a planar viewpoint by using the above software or the like. Obtain the embossed depth (measured cross-sectional curve) profile at minute Q1. From the cross-sectional curve of this embossed depth profile, λc: 800 μm (where λc is shorter than the “filter that defines the boundary between the roughness component and the waviness component” described in JIS-B0601 “3.1.1.2”). Of the "contour curve Q2" of the image part (Y part in the figure) shown from the cross-sectional viewpoint obtained by removing the surface roughness component of the wavelength with a low frequency filter, the two that are convex upward and have the strongest bending. The minimum value between the concave edge points P1 and P2 and the concave edge points P1 and P2 is obtained, and the minimum depth is set to Min. Further, the average value of the depth values of the recessed edge points P1 and P2 is defined as the maximum depth value Max. In this way, the embossing depth = maximum value Max-minimum value Min. Further, the distance (length) of the recessed edge points P1 and P2 on the XY plane is defined as the length of the longest portion. The two concave edge points P1 and P2 that are convex on the above and have the strongest bending are visually selected. In making the selection, the contour E in the image of the planar viewpoint of the recess 20 during the measurement may be referred to. Similarly, the depth of the recess 20 is measured for the shortest portion in the direction perpendicular to the longest portion, and the larger value is adopted as the depth of the recess 20. The above measurement is performed for any 10 embosses on the surface, and the average value is taken as the depth of the recess.

On the other hand, in the industrial wipe of the present embodiment, the plan view shape of the convex portion can be various depending on the usage and preference of the consumer, but the plan view shape of the convex portion is an ellipse or a substantially elliptical shape. It is desirable to have a shape. Since the convex portion has an elliptical or substantially elliptical shape, there is no linear edge, the whole is an arc, and there is no angle, so that the fibers do not become excessively dense and it is easy to improve the liquid absorption performance and the paper strength. .. In particular, as shown in FIG. 3, it is desirable that the convex portion 21 has a shape in which each side of the rounded parallelogram has a central portion that bulges outward.

In order to make the shape of the concave portion 20 and the convex portion 21 different from each other in a plan view, embossing may be performed by steel match embossing. In this case, if the concave portion is a parallelogram with rounded corners, and the convex portion is a substantially elliptical shape in which the central portion of each side of the parallelogram with rounded corners bulges outward, the concave portion and the concave portion and Since the protrusions are close to each other, the load on the base paper is small when the paper surface is pressed by the steel match embossing process, and the decrease in paper strength can be reduced.

On the other hand, in the industrial wipe of the present embodiment, the total area ratio of the bottom of the recess 20 is 60% or more, preferably 75% or more, and the surface area ratio is 110% or more, preferably 130% or more. Is desirable. Since the bottom of the concave portion 20 is pressed by the top surface of the convex portion of the embossed roll, if the total area ratio of this portion is 60% or more, sufficient elasticity of the paper is developed and the durability is excellent. Further, when the total area ratio of the bottom of the concave portion 20 is 60% or more and the surface area ratio is 110% or more, the scraping property and the absorption performance due to the formation of the concave portion are sufficiently improved. The upper limit of the total area ratio of the bottom of the recess 20 is not necessarily limited. Further, the surface area ratio is the ratio of the surface area in the recess to the area in a plan view, and when the surface area ratio is high, the paper surface is stretched a lot and the surface area increases.

Here, the total area ratio and surface area ratio of the bottom surface of the recess are also determined by the one-shot 3D measurement macroscope VR-3200 manufactured by Keyence Co., Ltd. or its equivalent, and the image analysis software "VR-H1A" or its equivalent software. , Can be measured. Specifically, it is measured from the image portion shown from the plane viewpoint and the "contour curve Q2". As for the bottom surface position, the edge points P3 and P4 on the bottom side of the "contour curve Q2" may be determined in the same manner as in the measurement of the depth.

Further, the industrial wipe of the present embodiment preferably has an aspect ratio of dry tensile strength of 4.5 or less, preferably 4.0 or less. The specific dry tensile strength in the vertical direction and the horizontal direction is not necessarily limited, but is preferably 2000 to 3500 cN / 25 mm in the vertical direction and 600 to 1000 cN / 25 mm in the horizontal direction. Within this range, the strength is sufficient for wiping. The method for measuring the dry tensile strength is carried out according to JIS P8113 (1998). Examples of the measuring device include the "universal tensile compression tester TG-200N" manufactured by Minebea Co., Ltd. and its equivalent.

Further, in the industrial wipe 1 of the present embodiment, the specific wet tensile strength in the vertical direction and the horizontal direction is not necessarily limited, but is 700 to 1100 cN / 25 mm in the vertical direction and 200 to 800 cN / 25 mm in the horizontal direction. Is desirable. Within this range, the strength is sufficient for wiping after absorbing the liquid.

In particular, in the industrial wipe 1 of the present embodiment, as described above, the concave portion 20 and the convex portion 21 have different planar views, the surface area of one concave portion 20 is 6.6 to 12.4 mm ² , and the concave portion 20 has a surface area of 6.6 to 12.4 mm 2. The surface area of one convex portion 21 is 10.3 to 19.3 mm ² , and the difference between the surface area of the concave portion 20 and the surface area of the convex portion 21 is 3.7 to 6.9 mm ² . It should be noted that the surface area and the difference thereof here are in stereoscopic view, and the area of the convex portion 21 becomes wide. If the concave and convex shapes of the concave portion 20 and the convex portion 21 are different from each other and the difference between the concave surface area and the convex surface area is within the above range, deep embossing of the moat is performed in the multi-ply multi-layer paper industrial wipe 1. As a shape, it is possible to prevent ply separation during processing and use, and at the same time, it is possible to obtain supple and sufficient absorption performance, and further, it is possible to obtain sufficient paper strength. Such unevenness makes the shape and surface area of the convex portion 61 for forming the concave portion 20 different from the shape and surface area of the concave portion 71 for forming the convex portion 21 at the time of embossing. For example, it can be formed by embossing of a steel match method. In particular, the steel match embossing makes it easy to clarify the edge of the recess 20 on the paper surface, and can improve the wiping property.

Further, in the industrial wipe 1 of the present embodiment, it is desirable that the elongation rate of the vertical MD is 30% or more. If the elongation rate is 30% or more, it can be said that there is sufficient suppleness. Here, in particular, as described above, when the concave shape 20 and the convex portion 21 have different planar views, and the difference between the concave surface area and the convex surface area is 3.7 to 6.9 mm ² , the vertical MD is extended. It is easy to increase the rate to 30% or more. This is because the above area difference can be obtained by appropriately adjusting the clearance between the convex portion 61 for forming the concave portion 20 and the concave portion 71 for forming the convex portion 21 at the time of embossing. .. Since this clearance is related to the load on the base paper and related to the degree of compaction of the fibers, it is easy to achieve this significantly high elongation rate especially in the case of the above area difference.

Here, the elongation rate according to this embodiment is measured based on the tensile test of JISP8113 (2006). The test piece used is cut to a width of 25 mm (± 0.5 mm) × a length of about 150 mm. As the testing machine, a load cell tensile testing machine TG-200N manufactured by Minebea Co., Ltd. is used. Set the grip interval to 100 mm. The measurement is performed by tightening both ends of the test piece to the grip of the testing machine, applying a tensile load to the paper piece in the vertical direction, and reading the indicated value (digital value) when the paper breaks. The tensile speed is 100 mm / min. Five sets of samples are prepared for each and measured five times each, and the average of the measured values is taken as the dry tensile strength in each direction.

On the other hand, in the industrial wipe 1 of the present embodiment, the embossing densities of the concave portion 20 and the convex portion 21 are not necessarily limited, but in the concave portion 20, it is often 30 or more in a perfect shape per 30 mm × 30 mm. The number is preferably 50 to 60, more preferably 45 to 55.

Further, in the industrial wipe 1 of the present embodiment, it is desirable that the area ratio of the portion other than the convex portion on the convex portion side is more than 50%, more preferably more than 55%. With this area ratio, it is easy to obtain the above-mentioned elongation ratio. Here, the area ratio other than the convex portion can be measured by the one-shot 3D measurement macroscope VR-3200 manufactured by Keyence Co., Ltd. or its equivalent, and the image analysis software "VR-H1A" or its equivalent software. .. The measurement is performed under the conditions of a magnification of 12 times and a visual field area of 30 mm × 30 mm. However, the magnification and the viewing area can be changed as appropriate. It is better to select so that there are at least 30 convex portions. Specifically, it is desirable to measure the area of the portion obtained by subtracting the design embossed height value from the maximum value of the convex portion in the height difference image shown in the measurement range, and calculate the ratio. The depth of the recess 20 may be measured as described below and the value may be subtracted.

The water absorption rate, water absorption amount and oil absorption amount, and the wiping property of grease were measured for the industrial wipe (Example) and the conventional paper material industrial wipe (Comparative Examples 1 to 3) according to the present embodiment. In addition, Example 1 has the shape and arrangement of the recesses shown in FIG. Comparative Example 2 has the shape and arrangement of the recesses shown in FIG. The recess 120 according to Comparative Example 2 has a shape having a pair of parallel edges 150 and 150 along the vertical MD and semicircular edges 140 and 140 connecting the ends of the edges and bulging outward. There is. Further, the recesses 120 are arranged at an angle ∠β of 54 degrees with respect to the MD direction. Comparative Example 2 and Comparative Example 3 are those of pin embossing. The physical characteristics and compositions of each Example and Comparative Example are shown in Table 1 together with the test results. The water absorption rate, the amount of water absorption, the amount of oil absorption, and the wiping property of grease were measured as follows.

[Water absorption rate]
The water absorption rate was measured as described in (1) to (5) below.
(1) Cut the sample into a rectangle of 250 mm in the MD direction and 250 mm in the CD direction.
(2) Fold the sample in four.
(3) Fill a tray (for example, internal dimensions: 215 mm × 160 mm) larger than the four-folded sample with water at 25 ° C. to a depth of about 20 mm.
(4) Place the quadruple-folded sample on a rigid flat net (for example, 120 mm × 120 mm, mesh 15 mm) larger than the quadruple-folded sample, and lower it into the tray containing the water. , Place the test piece on the water surface so that it comes into contact with the water surface.
(5) Measure the time from when the sample is placed on the surface of the water until the water is immersed in the entire sample. In addition, it is visually confirmed whether or not the water has soaked.

[Water absorption]
The water absorption was measured as described in (1) to (6) below.
(1) Cut the sample into a rectangle of 250 mm in the MD direction and 250 mm in the CD direction.
(2) The mass of the sample is measured by an electronic balance (A & D HR300, etc.).
(3) Fold the sample in four and fill a tray larger than the sample (for example, internal dimensions: 215 mm × 160 mm) with water at 25 ° C. to a depth of about 20 mm.
(4) The sample is placed on a rigid flat net (for example, 120 mm × 120 mm, mesh 15 mm) having a size larger than that of the sample, placed in a tray containing the water, and the sample is submerged for 11 minutes.
(5) After soaking, fold it in half diagonally with tweezers and then pull it up from the bat.
(6) The mass of the sample that has absorbed water is measured with an electronic balance, and the amount of water absorption per 1 m ² is calculated by the following formula.
Water absorption (g / m ² ) = ((mass of test piece measured in (4) above)-(mass of test piece measured in (1) above)) x 100 (Note: converted to m ² ) Therefore, multiply by 100)

[Oil absorption]
It was measured by the same operation and calculation formula as in the above [water absorption] test. The changes from the [Water absorption] test are that the size of the sample to be cut is a rectangle of 200 mm in the vertical direction and 200 mm in the horizontal direction, and the liquid to be put in the bat is salad oil at 25 ° C (Nisshin salad oil: Sun). Qing Oilio Group Co., Ltd.), engine oil (ULTRA 2 SUPER: Honda Motor Co., Ltd.), lubricating oil (Super Gear 220: Idemitsu Kosan Co., Ltd.).

[Wipe off grease]
The wiping property of grease was measured by the following procedures (1) to (5).
(1) Cut the sample into a rectangle of 200 mm in the vertical direction and 200 mm in the horizontal direction.
(2) Fold this sample in four and measure the mass with an electronic balance (A & D HR300, etc.).
(3) A smooth resin film (manufactured by Asahi Kasei Corporation: Saran Wrap) is laid on a smooth stainless steel vat, and 1.7 g of grease is squeezed out in a straight line (about 2.0 cm) on the smooth resin film.
(4) Place the sample folded in four on the grease, and then place a 500 mL beaker containing 350 mL of water on it as a weight.
(5) Pinch the end of the sample and pull the sample laterally by 20 cm so as to slide on the bat.
(6) After that, the beaker of the weight is removed, the mass is measured with an electronic balance (A & D HR300, etc.), and the difference from the mass of the sample before grease is attached is calculated.

As the results of Table 1 show, the examples according to the present invention are more excellent in the wiping property of grease than the comparative examples 2 and 3 of the pin embossing. Further, it is superior in wiping property of grease as compared with Comparative Example 1 having a different concave shape. Further, the water absorption rate, the water absorption amount, and the oil absorption amount of various oils are all superior to those of Comparative Examples 1 to 3. Further, the paper thickness is also a low value in Example 1.
As shown in the above results, in particular, due to the recesses having a shape in which a pair of parallel edges are arranged at an angle of 50 to 60 degrees with respect to the vertical direction, the ply is difficult to peel off and the highly viscous deposits such as grease are wiped off. The property and the absorption performance of low-viscosity liquids such as water are further enhanced, and the industrial wipe is not excessively bulky.

1 ... Industrial wipe, 10 ... Sheet, 20, 120 ... Concave, 21 ... Convex, 30 ... Corner, 40, 50, 150 ... Parallel pair of edges, ∠α ... MD direction and edge angle, ∠ β ... Concave arrangement angle, L1, L2 ... Spacing of a pair of edges.

Claims (5)

It is an industrial wipe in which multiple sheets made of pulp as the main raw material are laminated and integrated by embossing unevenness.
The basis weight of each sheet is 15 to 30 g / m ² .
The unevenness is a single emboss in which only a concave portion is formed on one surface and only a convex portion corresponding to the concave portion is formed on the other surface.
The plan view shape of the concave portion has a pair of parallel edges, the edges of which are arranged at an angle of 50 to 60 degrees with respect to the vertical direction, and the depth of the concave portion is determined. 0.7-1.3 mm,
An industrial wipe that features that. The industrial wipe according to claim 1, wherein the plan view shape of the recess has another pair of parallel edges and the other pair of parallel edges are arranged so as to be vertically parallel. The industrial wipe according to claim 1 or 2, wherein the concave portion is a parallelogram having a plan view shape or a parallelogram having rounded corners. The industrial wipe according to claim 3, wherein the recesses are arranged such that a pair of parallel edges of adjacent recesses are located in a straight line. The industrial wipe according to any one of claims 1 to 4, wherein the total area ratio of the bottom of the recess is 60% or more and the surface area ratio is 110% or more.

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