JP2019051028A - Paper wiper and method of producing the paper wiper - Google Patents

Abstract

To provide a paper wiper which satisfactorily maintains adsorbing and scraping properties, and is sufficiently restrained from dust generation.SOLUTION: The paper wiper is provided that is laminated and housed in a box-shaped container, and is composed of 1-ply sheet. The paper wiper has a plurality of crepe formed by being applied with crepe processing. The crepe height of paper wiper is 40 μm or more and 60 μm or less, and the number of the crepes of the paper wiper is 35-pieces/10 mm or more and 40-pieces/10 mm or less. The spectral local maximum strength (TS7) including 6,500 Hz of the crepe is 30 dBVrms or more and 35 dBVrms or less, the spectral local maximum strength (TS7) being automatically acquired by using software on a tissue softness measuring device TSA, and the first spectral local maximum strength (TS750) from the low frequency side is 35 dBVrms or more and 40 dBVrms or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a paper wiper in which the adsorptivity and the scraping property are well maintained and dust generation is sufficiently suppressed.

  Paper wipers are mainly used for wiping industrial parts, laboratory instruments, and the like, and are required to have adsorptivity and scraping properties due to the properties of such applications. Therefore, in order to realize such a function, a method of imparting irregularities to the sheet surface by creping or embossing using a paper machine is used. In particular, when wiping off an object having a high viscosity, creping that can provide large irregularities is effective.

As a paper wiper subjected to a creping process, for example, Patent Document 1 discloses a paper wiper having a basis weight of 20 g / m ² or more and 40 g / m ² or less formed by creping by dry creping processing. 70% by mass or more and 100% by mass or less and LBKP in a raw material containing 0% by mass or more and 30% by mass or less, and the freeness of the pulp slurry is reduced to 20 cc or more and 100 cc or less by beating, and in the dry creping process, A paper wiper characterized in that the crepe rate is 20% to 40% and the contact angle between the creping doctor and the dryer is 115 ° to 130 ° is disclosed.

Japanese Patent No. 5191112

  Here, since the paper wiper is used for wiping the inside of the experimental instrument that is directly touched by the test object, in addition to the above-described adsorptivity and scraping property, low dust generation is required. In the paper wiper described in 1, dust generation could not be sufficiently suppressed even if the adsorptivity and the scraping property could be secured. Accordingly, there has been a demand for a paper wiper in which the adsorptivity and the scraping property are well maintained and the dust generation is sufficiently suppressed.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a paper wiper in which the adsorptivity and the scraping property are well maintained and dust generation is sufficiently suppressed. .

  The inventors of the present invention have conducted extensive research in view of the above problems. As a result, it has been found that the above problems can be solved by adjusting the height of the crepe, the number of crepes, and the predetermined parameters measured by the tissue softness measuring device TSA, and the present invention has been completed. Specifically, the present invention provides the following.

(1) A first aspect of the present invention is a paper wiper made of a single ply sheet that is stacked and accommodated in a box-type container, and the paper wiper has a plurality of crepes formed thereon. The crepe has a height of 40 μm or more and 60 μm or less, the number of the crepes is 35/10 mm or more and 40/10 mm or less, and the tissue softness measuring apparatus TSA installed the sample on the sample stage. The tissue softness measuring device TSA was measured when the bladed rotor was pushed into the paper wiper from the top with an indentation pressure of 100 mN and rotated at a rotational speed of 2.0 / second and the vibration of the sample stage was measured with a vibration sensor. were automatically acquired at the above software, the intensity of the maximum peak of the spectrum containing 6500Hz (TS7) is 30DBV ² ms or more 35DBV is a ² rms or less, the first maximum intensity peak of the spectrum from the low frequency side (TS750) is less than 35dBV ² rms or more 40dBV ² rms, a paper wiper.

  (2) A second aspect of the present invention is the paper wiper according to (1), characterized in that it contains 70% by mass or more and 100% by mass or less of softwood bleached kraft pulp.

  (3) According to a third aspect of the present invention, a web constituting a sheet of a paper wiper is produced, and the web is wound after being creped by a creping doctor while being dried with a Yankee dryer. Create a roll, set the two original fabric rolls in a rotary interfolder, collect both sides of the sheet of each original fabric roll, fold it with a rotary interfolder, and then stack the paper wiper stack The paper wiper manufacturing method according to (1) or (2), wherein the paper wiper is manufactured and then accommodated in the box-shaped container.

In the paper wiper of the present invention, the height of the crepe is 40 μm or more and 60 μm or less, the number of crepes is 35/10 mm or more and 40/10 mm or less, and measured under a predetermined condition by the tissue softness measuring device TSA. Since TS7 is not less than 30 dBV ² rms and not more than 35 dBV ² rms and TS750 is not less than 35 dBV ² rms and not more than 40 dBV ² rms, the paper wiper of the present invention maintains good adsorbability and scraping property, and generates dust. Is sufficiently suppressed.

It is drawing which shows the measuring method of the number and height of a crepe. It is another drawing which shows the measuring method of the number and height of a crepe. FIG. 3 is a partially enlarged view of FIG. 2. It is drawing which shows the measurement principle of the tissue softness measuring apparatus TSA. It is drawing which shows the TS7 value and TS750 value of the sample by the tissue softness measuring apparatus TSA. It is drawing which shows an example of the rotary type | system | group interfolder used for manufacture of the paper wiper of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. Throughout the description of the embodiment of the present invention, the same reference numerals are given to the same elements.

<Paper wiper>
The paper wiper 1 of the present invention is accommodated in a box-shaped container 20 and is composed of a single ply sheet. The paper wiper 1 of the present invention can be used for wiping off dust, dirt, moisture and oil adhering to the outer and inner surfaces of test instruments such as test tubes and beakers, products and parts. The paper wiper 1 of the present invention can be taken out from the box-type container 20 in a pop-up manner, and the individual paper wipers 1 are stacked while sandwiching the upper and lower paper wipers 1 by being Z-folded or V-folded. In the description of the specification, the horizontal direction is a direction parallel to the slit provided at the outlet of the box-shaped container 20, and the vertical direction is a direction orthogonal to the horizontal direction in plan view. It is. The height is a dimension along the stacking direction of the paper wipers 1 housed inside the box-shaped container 20.

[Paper thickness, basis weight]
In the paper wiper 1 of the present invention, the paper thickness is preferably 1.0 mm / 10 or more and 2.0 mm / 10 or less, and preferably 1.3 mm / 10 or more and 1.5 mm / 10 or less. More preferred. In the paper wiper 1 of the present invention, the basis weight per sheet ply is preferably 18 g / m ² or more and 24 g / m ² or less, more preferably 20 g / m ² or more and 22 g / m ² or less. preferable. When the paper thickness of the paper wiper 1 and the basis weight per sheet ply are within the above ranges, appropriate adsorptive properties and scraping properties can be obtained.

[Crepe]
The paper wiper 1 of the present invention has a plurality of crepes by being creped. When the paper wiper 1 has a plurality of crepes, the adsorptivity and scraping property of the paper wiper 1 can be improved. Moreover, the height of the crepe in the paper wiper 1 of the present invention is 40 μm or more and 60 μm or less, and the number of crepes is 35/10 mm or more and 40/10 mm or less. By adjusting the height and number of the crepes within the above range, dust generation can be suppressed while maintaining the adsorptivity and the scraping property well. When the height of the crepe exceeds 60 μm, the surface area increases and the amount of adsorption increases. However, the bond between fibers is cut, and the fibers tend to come out and dust generation tends to increase. Moreover, dust generation increases when the number of crepes exceeds 40 pieces / 10 mm. The number and height of the crepes can be determined by, for example, using a Yankee dryer and adjusting the angle of the creping doctor. Specifically, if the angle of the creping doctor is set to an acute angle, the number of crepes increases but the height decreases. If the angle is made obtuse, the number of crepes decreases but the height increases. The height of the crepe is preferably 55 μm or more and 60 μm or less.

  The number and height of the crepes are obtained by measuring with a microscope. As the microscope, the product name “One-shot 3D measurement macroscope VR-3100” manufactured by KEYENCE can be used. As the microscope image observation / measurement / image analysis software, the product name “VR-H1A” can be used. The measurement conditions were a magnification of 38 times and a visual field area of 8 mm × 6 mm (measured under the condition that the MD direction of the sheet is parallel to the side of 6 mm. The measurement magnification and the visual field area are appropriately changed depending on the size of the crepe to be obtained Although the three-dimensional measuring device and the contour shape measuring device are measured by points or lines, in the case of the one-shot 3D measurement, the entire surface and undulation are easily understood because the entire surface is measured.

  A specific method for measuring the number and height of crepes will be described with reference to FIGS. FIG. 1 is an image on an XY plane by a microscope. The vertical direction in FIG. 1 is the MD direction of the sheet, and the horizontal direction is the CD direction of the sheet. When the line segment S1-S2 parallel to the MD direction is drawn on the entire top and bottom of the image at an arbitrary position in the CD direction of the XY plane image of the height profile (mapping, not shown) in FIG. Height (measured cross section curve) profile is obtained. Each crepe extends along the CD direction, and the line segment S1-S2 crosses the plurality of crepes. Therefore, the line segment S1-S2 is drawn at any position in the CD direction of the XY plane image. However, the height profile of the crepe is almost unchanged.

  Here, the height profile is a (measurement) cross-sectional curve S that represents the unevenness of the sheet surface of the actual paper wiper 1, but noise (fiber lumps are present on the sheet surface of the paper wiper 1, or the fibers are bearded. In the calculation of the height and number of the crepes, it is necessary to remove such a noise peak. Therefore, the cross-sectional curve S is set under predetermined filter conditions (λs: 150 μm (cutting noise finer than 150 μm), λc: 2.5 mm (cutting waves larger than 2.5 mm (waviness, inclination of the sample itself)). The roughness curve W (FIG. 2) is calculated (automatically obtained on the above software), where λs is the “roughness component and the roughness component described in JIS-B0601“ 3.1.1.1 ”. “Filter defining a boundary with a shorter wavelength component”, λc is a “filter defining a boundary between a roughness component and a waviness component” described in the same standard.

  About the obtained roughness curve W, let Rc (average height of a mountain valley (unevenness | corrugation)) automatically calculated on the said software be a crepe height. However, Rc is “average height of roughness curve element” described in JIS-B0601 (2013) “4.1.4”. Next, from the roughness curve W of FIG. 2, the number of peaks is measured to determine the number of crepes. The measurement may be visual, or may be a value as long as it can be calculated by software (for example, spreadsheet software). Here, with reference to FIG. 3 which is the elements on larger scale of FIG. 2, the measuring method of the number of peaks is demonstrated. One mountain is defined by an adjacent upward inflection point and downward convex inflection point. The inflection point is a point (0 at this point) where the sign of the curvature (plus, minus) changes on the roughness curve W. Moreover, when the height is less than 3 μm, it is not included in the measurement. Also, three line segments S1-S2 are set for one height profile image, and three roughness curves W in FIG. 2 are obtained. Then, for each of these three roughness curves W, the number of peaks and Rc are obtained. Three sample images are prepared, and the crepe height and number obtained by averaging a total of nine data (number of peaks and Rc) are employed.

[TS750, TS7, D]
The TS7 value indicating the softness of the paper wiper 1 which is the base material of the wet wiper, the TS750 value indicating the smoothness, and the D value indicating the rigidity are measured using a tissue softness measuring apparatus TSA5 (Tissue Softness Analyzer). The tissue softness measuring device TSA5 performs vibration analysis and parameterizes (TS value) the vibration data detected by various sensors when pressing the rotor with blade rotated from the paper wiper 1 (sample). , Mainly for quantitative evaluation of softness (feel of touch) of tissue, paper wiper 1 and the like, and is a trade name of Emtec Electronic GmbH of Germany (Japan agency is Japan Luft Co., Ltd.).

  4A and 4B are diagrams showing the measurement principle of the tissue softness measuring apparatus TSA5. Specific measurement using the tissue softness measuring apparatus TSA5 is as follows. (I) As shown in FIG. 4 (a), a sample 52 (a sample punch of emtec Inc. is used and a diameter of about 112.8 mm is used so as to cover the circular sample stage 51 of the tissue softness measuring apparatus TSA5 from the outside. Then, the outer periphery of the sample 52 is fixed by the sample fixing ring 53 and the rubber lip 54. (Ii) As shown in FIG. 4B, the bladed rotor 55 is pushed from above with a constant and changeable force. In this step, the force sensor 56 controls the pushing pressure of the blade 55a. When the pressing pressure reaches 100 mN, the bladed rotor 55 is rotated on the sample 52 at a rotational speed of 2.0 / sec by the motor 52b. (Iii) The vibration of the sample stage 51 is measured by a vibration sensor 51a installed inside the sample stage 51, the vibration frequency is analyzed, and parameterized (TS value). The vibration frequency depends on the structural dimensions of the creping and the rotational speed of the blade 55a. Induction of horizontal vibration (resonance frequency: 6500 Hz) of the blade 55a itself occurs due to momentary interruption by the convex portion of the sample 52 and vibration of the blade 55a when traveling on the surface of the sample 52. The intensity of the maximum peak of the first spectrum from the low frequency side is the TS750 value, and the intensity of the maximum peak of the spectrum including the resonance frequency: 6500 Hz (around 6500 Hz) is the TS7 value. (Iv) Next, the amount of deformation in the vertical direction (mm / N, D value) when the sample 52 is deformed without rotating the bladed rotor 55 at an indentation pressure of 100 mN and 600 mN is measured. By the procedures (i) to (iv), the softness, smoothness, and rigidity of the paper wiper 1 can be quantified. The measurement was made five times for each sample 52 of the paper wiper 1, and the average values were taken as the TS7 value, TS750 value, and D value of the paper wiper 1.

  Moreover, emtec measurement system is used as software for analyzing vibration and parameterizing (TS value). This software is equipped with various algorithms (for example, Base Tissue, Facial, TP, etc.), and automatically acquires the TS7 value, TS750 value, and D value on the software, and these TS7 value, TS750 value, D value or An HF (hand feel) value is calculated from the basis weight, thickness, number of plies, and the like depending on the type of various algorithms. In the present invention, TS7 value, TS750 value and D value are defined instead of HF value, and any algorithm can be used as long as the above measurement conditions are satisfied. TS7 value, TS750 value and D value are: It does not change depending on the algorithm type.

  FIG. 5 is a measurement diagram of the TS7 value and TS750 value of the sample 52 by the tissue softness measuring apparatus TSA5. As shown in FIG. 4, the blade 55a is in a fixed vertical position and moves horizontally on the sample 52 from the right to the left. By this horizontal movement, vertical vibration is generated in the sample 52, and the vibration frequency is analyzed to obtain the TS7 value and the TS750 value. The TS7 value is a value indicating the softness of the material of the sample 52, whereas the TS750 value has a correlation with the strength of smoothness and unevenness, and the larger the numerical value, the rougher and the stronger the unevenness. Means. Moreover, D value has a correlation with the result of a tensile strength test, and it means that it is so hard that a numerical value is small.

In the paper wiper 1 of the present invention, the TS7 value, which is the intensity of the maximum peak of the spectrum including 6500 Hz, automatically acquired by software on the tissue softness measuring device TSA5 is 30 dBV ² rms or more and 35 dBV ² rms or less. More preferably, it is 30 dBV ² rms or more and 32 dBV ² rms or less. By adjusting the crepe height and number to the range specified in the present invention, and further adjusting the TS7 value to the above range, it is possible to more effectively generate dust while maintaining good adsorption and scraping properties. Can be suppressed. When the TS7 value is less than 30 dBV ² rms, the stiffness of the sheet is lowered and the scraping property is lowered. Further, when the TS7 value exceeds 35 dBV ² rms, the stiffness becomes stronger and the scraping property is improved, but dust generation increases. The TS7 value can be adjusted by the crepe rate.

When the paper wiper 1 is measured by the tissue softness measuring device TSA5, the TS750 value, which is the intensity of the maximum peak of the first spectrum from the low frequency side automatically obtained by the software on the tissue softness measuring device TSA5, is is a 35dBV ² rms or more 40dBV ² rms or less, preferably not more than 38dBV ² rms or more 40dBV ² rms. After adjusting the crepe height and number to the range specified in the present invention, by adjusting the TS750 value to the above range, it is possible to more effectively generate dust while maintaining good adsorption and scraping properties. Can be suppressed. When TS750 exceeds 40 dBV ² rms, scraping performance is further improved, but dust generation is also increased. The TS750 value can be adjusted by the crepe rate.

  Furthermore, when the paper wiper 1 is measured by the tissue softness measuring device TSA5, the D value is preferably 2.5 mm / N or more and 3.0 mm / N or less, and 2.6 mm / N or more and 2.8 mm / N or less. It is more preferable that By adjusting the D value to the above range, it is possible to obtain moderate adsorbability and scraping property. The D value can be adjusted by the crepe rate.

(Raw material for paper wipers)
The 1-ply sheet constituting the paper wiper 1 is mainly composed of pulp, and preferably contains 50% by mass or more of pulp. Examples of the pulp that can be used for the manufacture of the paper wiper 1 include wood pulp, waste paper pulp, and non-wood pulp. The paper wiper 1 of the present invention is preferably composed of 100% wood pulp as a pulp. In addition, waste paper pulp and non-wood pulp may be included. Examples of components other than pulp include fillers, synthetic fibers, and natural fibers. In order to obtain the target quality, it is preferable to contain 70% by mass or more and 100% by mass or less of softwood bleached kraft pulp (NBKP). In this case, as raw materials other than NBKP, hardwood bleached kraft pulp (LBKP) is used. It is preferable to contain. Further, in order to improve the low dust generation property, it is more preferable to use wood pulp made of 100% by mass of NBKP having a long fiber length and easy interfiber bonding as a raw material.

  As a material type of the LBKP, a pulp produced from the Eucalyptus genus Eucalyptus represented by Eucalyptus grandis and Eucalyptus globulus is preferable. Further, examples of the above-mentioned NBKP grade include pine and fir. From the viewpoint of strength, pulp manufactured from the genus Pine is preferable. You may contain waste paper pulp to about 30 mass parts with respect to 100 mass parts of wood pulp of said pulp ratio. Waste paper pulp has a large variation in quality, and if the blending ratio increases, the quality of the product, particularly dust generation, is greatly affected. Therefore, the blending amount with respect to wood pulp is preferably 30 parts by mass or less, and preferably 10 parts by mass or less. More preferably, it is more preferably 5 parts by mass or less, and most preferably no waste paper pulp is blended. The waste paper pulp is preferably derived from milk carton.

  In addition, in order to ensure an appropriate strength for the paper wiper 1, the strength can be adjusted by beating the pulp fiber after blending the raw materials by a normal means. As the beating process for obtaining the target quality, the amount of change ΔF in freeness (Canadian standard freeness) measured by JIS P 8121 with respect to a commercially available virgin pulp is 20 mL or more and 200 mL or less, more preferably 50 mL or more. It is preferable to reduce the freeness so as to be 120 mL or less. A dry paper strength enhancer may be used, and a wet paper strength enhancer is preferably used.

[Box container]
The paper wiper 1 of the present invention is accommodated in a rectangular parallelepiped or cubic box-shaped container 20. The box-shaped container 20 has, on the top surface portion, a take-out port whose outer periphery is formed by perforations and a window pasting film that is affixed to the back surface outside the take-out port and has a slit for take-out. When using the paper wiper 1 stored in the box-type container 20, the paper wiper 1 stored in the box-type container 20 is taken out after cutting off the cut piece formed from the portion surrounded by the perforation. Can do. The slits are arranged in a direction parallel to the unfolded side of the paper wiper 1 laminated on the box-shaped container 20.

  Examples of the shape of the outlet include a rhombus, a substantially rectangular shape, a substantially elliptical shape, and a hexagonal shape. Here, when the paper wiper 1 is taken out from the box-shaped container 20, the frictional resistance applied to the paper wiper 1 is concentrated in the central portion in the horizontal direction of the slit. The diamond is parallel to the slit and the vertical dimension of the outlet is 24 mm or more and 120 mm or less at the lateral center of the outlet, or the two opposite sides of the outlet are parallel to each other. Either of the two hexagons whose two opposite sides of the outlet are parallel or perpendicular to the slit and whose vertical dimension of the outlet is 24 mm or more and 120 mm or less at the lateral center of the outlet. The shape is preferred. By making the shape of the outlet into the rhombus or hexagon as described above, when the paper wiper 1 is taken out from the box-shaped container 20, the window at the lateral center of the slit where the frictional resistance is most likely to be applied to the paper wiper 1 When the film for pasting is easily deformed, the frictional resistance applied to the paper wiper 1 when taken out can be reduced, and dust generation can be suppressed.

<Paper wiper manufacturing method>
The paper wiper 1 of the present invention can be manufactured, for example, in the following order: (i) production of the raw fabric roll 10 and (ii) interfolder processing.

(I) Manufacture of raw fabric roll The web which comprises the sheet | seat of the paper wiper 1 which concerns on embodiment of this invention can be manufactured with a general papermaking method. Specifically, the papermaking raw material (pulp) is disaggregated with water at a predetermined concentration in a pulper (tank) to obtain a paper stock. This stock is ejected from an inlet (head box) onto a wire and dehydrated to form a wet paper web. This wet paper web is conveyed to the dryer part by felt or the like. In the dryer part, the wet web is dried by a Yankee dryer equipped with a creping doctor, and the web is creped by a known method by a creping doctor, and then wound on a reel to obtain an original roll 10. be able to.

(Ii) Interfolder processing The paper roll 10 thus obtained is further processed to obtain the paper wiper 1.

  Processing of the original fabric roll 10 can be performed by a known interfolder processing, and a sheet that can be taken out in a pop-up manner by folding each sheet of the original fabric roll 10 while being alternately stacked and processed. The wiper 1 can be obtained. If the sheet can be taken out in a pop-up manner, each sheet of the original fabric roll 10 may be folded at the center by V-shaped folding or Z-shaped folding.

  Examples of the inter-folder include a rotary inter-folder and a multi-stand inter-folder, but it is preferable to use the rotary inter-folder 100. Although the rotary interfolder 100 is slower in processing speed than the multi-stand interfolder, it does not apply a large tension, and it is easy to adjust the height and number of crepes within the range defined in the present invention.

  Specifically, as shown in FIG. 6, two original fabric rolls 10 are set in a rotary interfolder 100, and both surfaces of each original fabric roll are collected by a dust collector 101, and then a rotary interfolder 10 is used. The laminated body 11 of the paper wiper 1 is manufactured by folding with the folder processing machine 102, and accommodated in the box-shaped container 20, and the paper wiper 1 of the present invention can be obtained. Moreover, as shown in FIG. 6, it is preferable to compress the laminate 11 before inserting the laminate 11 into the box-shaped container 20. In this processing, a compression device 103 is provided immediately above the transport device 104 that places the laminate 11 and conveys it to the box-shaped container 20, and the laminate 11 is compressed by passing the laminate 11 between them. It has become. When the laminated body 11 is compressed in this way, the paper wiper 1 can be made bulky before the compression process, and can be adjusted to a predetermined height by the subsequent compression process. Compared to the above, the height and number of crepes can be adjusted more easily. In addition, as shown in FIG. 6, dust is collected directly from the sheet before being folded by the rotary type interfolder 102, so that dust generation can be effectively suppressed.

  The present invention has been described based on the embodiments. However, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be apparent to those skilled in the art that improvements can be made. Further, it is apparent from the scope of the claims that embodiments with such changes or improvements can also be included in the technical scope of the present invention.

  Hereinafter, the present invention will be described in detail with reference to examples. In addition, this invention is not limited to the Example shown below at all.

<Examples 1 and 2 and Comparative Examples 1 to 3>
After producing an original fabric roll containing 100% NBKP by the above manufacturing method, a laminated body of paper wipers is formed in a rotary interfolder, and further accommodated in a box-type container. Examples 1 and 2 The paper wipers of Comparative Examples 1 to 3 were obtained. The sheet of the paper wiper had a basis weight of 20 g / m ² , a vertical dimension of 215 mm, and a horizontal dimension of 120 mm before being folded in the vertical direction. The crepe height, the number of crepes, the TS7 value, and the TS750 value of each sheet were measured by the above method, and the measured values are shown in Table 1. Further, the amount of adsorption, dust generation, and scraping property were evaluated by the following methods, and the evaluation results are shown in Table 1.

(Dust generation)
Wiping work by spreading a sheet of paper wiper on black paper at a temperature of 23 ° C and a humidity of 50% RH, and then reciprocating 0.3 m at a distance of 0.3 m horizontally at 0.5 m / s. The paper dust remaining on the black paper was counted. Dust generation was evaluated according to the following criteria.
◎: When paper dust is less than 5 ○: When paper dust is 5 or more and less than 10 ×: When paper dust is 11 or more

(Adsorption amount)
1 g of grease was dropped on a plastic flat plate, the weight of the grease remaining on the plastic flat plate when wiped once with one sheet of paper wiper was measured, and the amount of adsorption was evaluated according to the following criteria.
A: When less than 0.2 g B: When 0.2 g or more and less than 0.5 g X: When 0.5 g or more

(Scraping property)
A groove having a depth of 3 mm and a width of 3 mm was formed on the plastic plate, 1 g of grease was hung on the groove of the plastic plate, and wiping work was performed by five monitors, and the scraping property was evaluated according to the following criteria.
◎: When there are 4 or more and 5 or less respondents who answered “good scraping ability” ○: When 1 or more and 3 or less respondents answered “good scraping ability” ×: “Scraping ability” When no one responds

  From Table 1, it can be seen that the paper wiper of the present invention maintains good adsorbability and scraping properties and sufficiently suppresses dust generation.

1 Paper wiper 5 Tissue softness measuring device TSA
51 Sample stage 51a Vibration sensor 52 Sample 53 Sample fixing ring 54 Rubber lip 55 Rotor with blade 55a Blade 55b Motor 56 Force sensor 10 Material roll 11 Laminate 20 Box-type container 100 Rotary interfolder 101 Dust collector 102 Rotary type Interfolder processing machine 103 Compressor 104 Conveyor

Claims (3)

A paper wiper made of a sheet of 1 ply and housed in a box-shaped container,
The paper wiper has a plurality of crepes by being creped,
The height of the crepe is 40 μm or more and 60 μm or less,
The number of the crepes is 35/10 mm or more and 40/10 mm or less,
Using a tissue softness measuring device TSA, the blade wiper was pushed into the paper wiper placed on the sample stage from the top as a pushing pressure of 100 mN, and then rotated at a rotational speed of 2.0 / second, thereby vibrating the sample stage. When measured with a vibration sensor, the intensity of the maximum peak (TS7) of the spectrum including 6500 Hz, which is automatically acquired by software on the tissue softness measuring apparatus TSA, is 30 dBV ² rms or more and 35 dBV ² rms or less. A paper wiper in which the intensity (TS750) of the peak of the first spectrum from the frequency side is 35 dBV ² rms or more and 40 dBV ² rms or less.   The paper wiper according to claim 1, comprising 70% by mass or more and 100% by mass or less of softwood bleached kraft pulp. A web constituting a sheet of a paper wiper is produced, and a web roll is produced by winding the web after being creped by a creping doctor while drying the web with a Yankee dryer,
Set the two original fabric rolls in a rotary interfolder, collect both sides of the sheet of each original fabric roll, fold it with a rotary interfolder processing machine to produce a laminate of paper wipers, The manufacturing method of the paper wiper of Claim 1 or 2 accommodated in the said box-type container.