JP6935629B2 - Paper wiper and method for manufacturing the paper wiper - Google Patents

Description

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

Paper wipers are mainly used for wiping industrial parts, laboratory equipment, etc., and due to the nature of such applications, adsorptivity and scraping property are required. Therefore, in order to realize such a function, a method of imparting unevenness to the sheet surface by crepe processing or embossing using a paper machine is used. In particular, when wiping a highly viscous object, crepe processing that can impart large irregularities is effective.

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

Japanese Patent No. 5191112

Here, since the paper wiper is used for wiping the inside of the laboratory equipment that the test object directly touches, in addition to the above-mentioned adsorptivity and scraping property, low dust generation property is required. The paper wiper according to No. 1 could not sufficiently suppress dust generation even if the adsorptivity and scraping property could be ensured. Therefore, there has been a demand for a paper wiper in which good adsorption and scraping properties are maintained and 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 adsorbability and scraping property are well maintained and dust generation is sufficiently suppressed. ..

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, they have found that the above problems can be solved by adjusting the height of crepes, the number of crepes, and predetermined parameters measured by the tissue softness measuring device TSA, and have completed the present invention. Specifically, the present invention provides the following.

(1) The first aspect of the present invention is a paper wiper composed of a one-ply sheet that is laminated and housed in a box-shaped container, and the paper wiper is subjected to a crepe process to obtain a plurality of paper wipers. The crepe has a crepe, 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, and the crepe is installed on the sample table by the tissue softness measuring device TSA. When the rotor with a blade is pushed into the paper wiper from above as a pushing pressure of 100 mN and then rotated at a rotation speed of 2.0 / sec, and the vibration of the sample table is measured by the vibration sensor, the tissue softness measuring device TSA The intensity of the maximum peak of the spectrum including 6500 Hz (TS7) automatically acquired by the above software is 30 dBV ² rms or more and 35 dBV ² rms or less, and the intensity of the maximum peak of the first spectrum from the low frequency side (TS750). ) Is 35 dBV ² rms or more and 40 dBV ² rms or less, which is a paper wiper.

(2) The 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) A third aspect of the present invention is to prepare a web constituting a sheet of a paper wiper, dry the web with a Yankee dryer, crepe it with a creping doctor, and then wind it up. A roll is prepared, the two raw fabric rolls are set in a rotary interfolder, dust is collected on both sides of the sheet of each raw fabric roll, and then folded by a rotary interfolder processing machine to form a laminated body of paper wipers. The method for manufacturing a paper wiper according to (1) or (2), wherein the paper wiper is manufactured and then housed in the box-shaped container.

In the paper wiper of the present invention, the height of the crepes is 40 μm or more and 60 μm or less, the number of crepes is 35 pcs / 10 mm or more and 40 pcs / 10 mm or less, and the crepes are measured by a tissue softness measuring device TSA under predetermined conditions. Since the TS7 is 30 dBV ² rms or more and 35 dBV ² rms or less and the TS750 is 35 dBV ² rms or more and 40 dBV ² rms or less, the paper wiper of the present invention maintains good adsorptivity and scraping property and generates dust. Is sufficiently suppressed.

It is a drawing which shows the measuring method of the number of crepes and the height. It is another drawing which shows the measuring method of the number of crepes and the height. It is a partially enlarged view of FIG. It is a drawing which shows the measuring principle of the tissue softness measuring apparatus TSA. It is a figure which shows the TS7 value and TS750 value of the sample by the tissue softness measuring apparatus TSA. It is a drawing which shows an example of the rotary type interfolder used for manufacturing the paper wiper of this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail. The same elements are designated by the same reference numerals throughout the description of the embodiments of the present invention.

<Paper wiper>
The paper wiper 1 of the present invention is laminated and housed in a box-shaped container 20, and is composed of a 1-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-shaped container 20 in a pop-up manner, and the individual paper wipers 1 are Z-folded or V-folded and laminated while sandwiching the upper and lower paper wipers 1. 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 a plan view. Is. The height is a dimension along the stacking direction of the paper wiper 1 housed inside the box-shaped container 20.

[Paper thickness, basis weight]
The paper thickness of the paper wiper 1 of the present invention is preferably 1.0 mm / 10 sheets or more and 2.0 mm / 10 sheets or less, and 1.3 mm / 10 sheets or more and 1.5 mm / 10 sheets or less. More preferred. Further, 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, and more preferably 20 g / m ² or more and 22 g / m ² or less. preferable. By setting the paper thickness of the paper wiper 1 and the basis weight per sheet ply within the above ranges, appropriate adsorptivity and scraping property can be obtained.

[Crepe]
The paper wiper 1 of the present invention has a plurality of crepes by being subjected to crepe processing. Since the paper wiper 1 has a plurality of crepes, the adsorptivity and scraping property of the paper wiper 1 can be improved. The height of the crepes 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 pieces / 10 mm or more and 40 pieces / 10 mm or less. By adjusting the height and number of crepes within the above range, it is possible to suppress dust generation while maintaining good adsorptivity and scraping property. When the height of the crepe exceeds 60 μm, the surface area becomes large and the amount of adsorption increases, but the interfiber bond is broken, the fibers tend to come off easily, and dust generation tends to increase. Also, when the number of crepes exceeds 40/10 mm, dust generation increases. The number and height of crepes can be determined, for example, by using a Yankee dryer and adjusting the angle of the crepe doctor. Specifically, if the angle of the crepe doctor is sharp, the number of crepes is large but the height is low, and if the angle is obtuse, the number of crepes is small but the height is high. The height of the crepe is preferably 55 μm or more and 60 μm or less.

The number and height of crepes are measured using a microscope. As the microscope, the product name "One-shot 3D measurement macroscope VR-3100" manufactured by KEYENCE can be used. The product name "VR-H1A" can be used as the image observation / measurement / image analysis software of the microscope. The measurement conditions are a magnification of 38 times and a visual field area of 8 mm × 6 mm (measurement is performed 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. A three-dimensional measuring machine or a contour shape measuring machine may measure points or lines, but in the case of one-shot 3D measurement, since the entire surface is measured, the overall shape and waviness are easy to understand.

A specific method for measuring the number and height of crepes will be described with reference to FIGS. 1 to 3. FIG. 1 is an image of the XY plane taken by a microscope. The vertical direction of FIG. 1 is the MD direction of the sheet, and the horizontal direction is the CD direction of the sheet. When the line segments S1-S2 parallel to the MD direction are drawn at arbitrary positions in the CD direction of the XY plane image of the height profile (mapping, not shown) in FIG. 1, the crepe is drawn on the entire top and bottom of the image. Height (measurement cross-section curve) profile is obtained. Since each crepe extends along the CD direction and the line segment S1-S2 crosses these plurality of crepes, 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 the same.

Here, the height profile is a (measured) cross-sectional curve S representing 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 whisked. It also contains steep peaks caused by stretched or fiberless parts), and it is necessary to remove such noise peaks when calculating the height and number of crepes. Therefore, the cross-section curve S is formed under predetermined filter conditions (λs: 150 μm (cuts noise finer than 150 μm) and λc: 2.5 mm (cuts waves larger than 2.5 mm (waviness, inclination of the sample itself)). The process is performed to calculate the roughness curve W (FIG. 2) (automatically obtained by the above software). However, λs is the “roughness component and the roughness component described in JIS-B0601 “3.1.1.1””. "Filter that defines the boundary with shorter wavelength components" and λc are "filters that define the boundary between the roughness component and the waviness component" described in the same standard.

For the obtained roughness curve W, Rc (average height of peaks and valleys (unevenness)) automatically calculated on the above software is defined as the crepe height. However, Rc is the "average height of the roughness curve element" described in JIS-B0601 (2013) "4.1.4". Next, the number of crepes is calculated from the roughness curve W in FIG. 2 by measuring the number of peaks. The measurement may be performed visually, or may be a value as long as it can be calculated by software (for example, spreadsheet software). Here, a method of measuring the number of mountains will be described with reference to FIG. 3, which is a partially enlarged view of FIG. One mountain is defined by adjacent, upwardly convex inflection points and downwardly convex inflection points. The inflection point is a point (0 at this point) where the sign (plus, minus) of the curvature changes on the roughness curve W. If the height is less than 3 μm, it is not included in the measurement. Further, three line segments S1-S2 are set for one height profile image, and three roughness curves W in FIG. 2 are obtained. Then, the number of peaks and Rc are obtained for each of these three roughness curves W. Three images of the sample are prepared, and the crepe height and the number obtained by averaging a total of nine data (number of peaks and Rc) are adopted.

[TS750, TS7, D]
The TS7 value indicating the softness, the TS750 value indicating the smoothness, and the D value indicating the rigidity of the paper wiper 1 which is the base material of the wet wiper are measured using a tissue softness measuring device TSA5 (Tissue Softness Analyzer). The tissue softness measuring device TSA5 analyzes the vibration data detected by various sensors when the rotor with a rotated blade is pressed from the top of the paper wiper 1 (sample), and parameterizes (TS value). , Mainly used to quantitatively evaluate the softness (feel) of tissues, paper wipers, etc., and is a trade name manufactured by Emtec Electric GmbH of Germany (Japan agency is Nihon Rufuto Co., Ltd.).

4 (a) and 4 (b) are diagrams showing the measurement principle of the tissue softness measuring device TSA5. The specific measurement using the tissue softness measuring device TSA5 is as follows. (I) As shown in FIG. 4 (a), a circle having a diameter of about 112.8 mm using a sample 52 (a sample punch manufactured by emtec) so as to cover the circular sample table 51 of the tissue softness measuring device TSA5 from the outside. The outer circumference of the sample 52 is fixed by the sample fixing ring 53 and the rubber lip 54. (Ii) As shown in FIG. 4 (b), the rotor 55 with a blade is pushed from above with a constant and variable force. In this step, the force sensor 56 controls the pushing pressure of the blade 55a. When the pushing pressure reaches 100 mN, the rotor 55 with a blade is rotated by the motor 52b on the sample 52 at a rotation speed of 2.0 / sec. (Iii) The vibration of the sample table 51 is measured by the vibration sensor 51a installed inside the sample table 51, the vibration frequency is analyzed, and the parameterization (TS value) is performed. The vibration frequency depends on the structural dimensions of the crepe process and the rotation speed of the blade 55a. The induction of horizontal vibration of the blade 55a itself (resonance frequency: 6500 Hz) occurs due to the momentary interruption by the convex portion of the sample 52 and the vibration of the blade 55a as it travels on the surface of the sample 52. The intensity of the maximum peak of the first spectrum from the low frequency side is defined as the TS750 value, and the intensity of the maximum peak of the spectrum including the resonance frequency: 6500 Hz (around 6500 Hz) is defined as the TS7 value. (Iv) Next, at pushing pressures of 100 mN and 600 mN, the amount of deformation displacement (mm / N, D value) in the vertical direction when the sample 52 is deformed without rotating the rotor 55 with a blade is measured. The softness, smoothness, and rigidity of the paper wiper 1 can be quantified by the steps (i) to (iv). The measurement was performed 5 times for each sample of the 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.

Further, as software for vibration analysis and parameterization (TS value), an emtec measurement system is used. This software is provided with various algorithms (for example, Base Calculation, Financial, TP, etc.), and automatically acquires TS7 value, TS750 value and D value on the software, and these TS7 value, TS750 value and D value or The HF (hand feel) value is calculated according to the type of various algorithms from the basis weight, thickness, number of plies, and the like. In the present invention, the TS7 value, the TS750 value and the D value are defined instead of the HF value, and any algorithm may be used as long as the above measurement conditions are satisfied, and the TS7 value, the TS750 value and the D value are the TS7 value, the TS750 value and the D value. It does not change depending on the type of algorithm.

FIG. 5 is a measurement diagram of the TS7 value and the TS750 value of the sample 52 by the tissue softness measuring device TSA5. As shown in FIG. 4, the blade 55a is in a constant vertical position and moves horizontally on the sample 52 from right to left. Due to this horizontal motion, 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 is a value that correlates with the strength of smoothness and unevenness, and the larger the value, the coarser and stronger the unevenness. Means. In addition, the D value has a correlation with the result of the tensile strength test, and the smaller the value, the harder it is.

Further, 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 the software on the tissue softness measuring device TSA5 is 30 dBV ² rms or more and 35 dBV ² rms or less. Yes, it is more preferably ^{30 dBV 2} rms or more and 32 dBV ^{2 rms or less.} By adjusting the crepe height and the number of crepes to the range specified in the present invention and further adjusting the TS7 value to the above range, dust generation is more effective while maintaining good adsorptivity and scraping property. Can be suppressed. When the TS7 value is ^{less than 30 dBV 2} rms, the stiffness of the sheet is reduced 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 was 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 acquired by the software on the tissue softness measuring device TSA5, is , 35 dBV ² rms or more and 40 dBV ² rms or less, and 38 dBV ² rms or more and 40 dBV ² rms or less is preferable. By adjusting the height and number of crepes to the range specified in the present invention and then adjusting the TS750 value to the above range, dust generation is more effective while maintaining good adsorptivity and scraping property. It can be suppressed. When the TS750 ^{exceeds 40 dBV 2} rms, the scraping property is further improved, but dust is also generated. The TS750 value can be adjusted by the crepe rate.

Further, 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. Is more preferable. By adjusting the D value within the above range, appropriate adsorptivity and scraping property can be obtained. The D value can be adjusted by the crepe rate.

(Raw material for paper wipers)
The 1-ply sheet constituting the paper wiper 1 contains pulp as a main component, and preferably contains 50% by mass or more of pulp. Examples of the pulp that can be used for producing the paper wiper 1 include wood pulp, used paper pulp, and non-wood pulp. The paper wiper 1 of the present invention is preferably made of 100% wood pulp, but is made of wood pulp. In addition, waste paper pulp and non-wood pulp may be included. Examples of components other than pulp include fillers, synthetic fibers, natural fibers and the like. 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, hardwood bleached kraft pulp (LBKP) is used as a raw material other than NBKP. It is preferable to include it. 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, which has a long fiber length and is easy to bond between fibers, as a raw material.

As the grade of LBKP, pulp produced from the genus Eucalyptus of the family Myrtaceae, represented by the genus Eucalyptus Grandis and Eucalyptus globulus, is preferable. Examples of the NBKP grade include pine and fir, but from the viewpoint of strength, pulp produced from the genus Pine is preferable. Recycled paper pulp may be contained up to about 30 parts by mass with respect to 100 parts by mass of wood pulp having the above pulp ratio. The quality of used paper pulp varies widely, and increasing the blending ratio greatly affects the quality of the product, especially dust generation. Therefore, the blending amount with respect to wood pulp is preferably 30 parts by mass or less, and 10 parts by mass or less. It is more preferable that the amount is 5 parts by mass or less, and it is most preferable that the used paper pulp is not blended. The used paper pulp is preferably derived from a milk carton.

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

[Box-shaped container]
The paper wiper 1 of the present invention is housed in a rectangular parallelepiped or cubic box-shaped container 20. The box-shaped container 20 has a take-out port whose outer periphery is formed by perforations, and a window sticking film which is attached to the back surface of the outside of the take-out port and has a slit for taking out. When using the paper wiper 1 stored in the box-shaped container 20, take out the paper wiper 1 stored in the box-shaped container 20 after separating the cut pieces formed from the portion surrounded by the perforations. Can be done. 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 hexagon. 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 lateral center of the slit. , A rhombus that is parallel to the slit and has a vertical dimension of the outlet of 24 mm or more and 120 mm or less at the center in the lateral direction of the outlet, or the two opposite sides of the outlet are parallel to each other and are taken out. A rhombus in which either two opposite sides of the outlet are parallel or perpendicular 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. The shape is preferable. By making the shape of the outlet a diamond shape or a hexagonal shape 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 frictional resistance is most likely to be applied to the paper wiper 1 Since the sticking film is easily deformed, the frictional resistance applied to the paper wiper 1 at the time of taking out can be reduced, and dust generation can be suppressed.

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

(I) Preparation of Raw Roll The web constituting the sheet of the paper wiper 1 according to the embodiment of the present invention can be manufactured by a general papermaking method. Specifically, the papermaking raw material (pulp) is dissolved in water at a predetermined concentration in a pulper (tank) to obtain a paper material. This paper material is ejected from the inlet (head box) onto the wire and dehydrated to form a wet paper web. This wet paper web is conveyed to the dryer part with felt or the like. In the dryer part, the wet web is dried by a Yankee dryer equipped with a crepe doctor, and the web is creped by a known method by the crepe doctor, and then wound on a reel to obtain a raw fabric roll 10. be able to.

(Ii) Interfolder processing The paper wiper 1 is obtained by further processing the raw fabric roll 10 thus obtained.

The processing of the raw fabric roll 10 can be performed by a known interfolder processing, and paper that can be taken out in a pop-up manner by alternately laminating and processing each sheet of each original fabric roll 10 while folding and crossing them. The wiper 1 can be obtained. Each sheet of the original roll 10 may be folded in a V-shape, a Z-shape, or the like at the center as long as it can be taken out in a pop-up manner.

Examples of the interfolder include a rotary interfolder and a multi-stand interfolder, but it is preferable to use the rotary interfolder 100. Although the processing speed of the rotary type interfolder 100 is slower than that of the multi-stand type interfolder, a large tension is not applied, and the height and number of crepes can be easily adjusted within the range specified in the present invention.

Specifically, as shown in FIG. 6, two raw fabric rolls 10 are set in the rotary type interfolder 100, and after collecting dust on both sides of the sheet of each raw fabric roll by the dust collector 101, the rotary type interfolder is used. The paper wiper 1 of the present invention can be obtained by folding it with the folder processing machine 102 to manufacture the laminated body 11 of the paper wiper 1 and accommodating it in the box-shaped container 20. Further, as shown in FIG. 6, it is preferable to compress the laminated body 11 before inserting the laminated body 11 into the box-shaped container 20. In this processing, a compression device 103 is provided directly above the transport device 104 on which the laminate 11 is placed and conveyed to the box-shaped container 20, and the laminate 11 is compressed by passing the laminate 11 between the two. It has become. When the laminate 11 is compressed in this way, the paper wiper 1 can be made bulky before the compression treatment and can be adjusted to a predetermined height dimension in the subsequent compression treatment. Therefore, when using a base paper that has been excessively compressed in advance. Compared to, the height and number of crepes can be adjusted more easily. Further, as shown in FIG. 6, since dust is collected directly from the sheet before being folded by the rotary type interfolder processing machine 102, dust generation can be effectively suppressed.

Although the present invention has been described above based on the embodiments, 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 clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to the examples shown below.

<Examples 1 and 2, Comparative Examples 1 to 3>
After producing a raw fabric roll containing 100% NBKP by the above manufacturing method, a laminated body of paper wipers is formed by a rotary type interfolder, and further housed in a box-shaped container. 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 adsorption amount, dust generation, and scraping property were evaluated by the following methods, and the evaluation results are shown in Table 1.

(Dust)
Wipe off by spreading one sheet of paper wiper on black paper under the conditions of temperature 23 ° C and humidity 50% RH, and then reciprocating horizontally for a distance of 0.3 m at 0.5 m / s three times. The operation was performed assuming the above, and the paper dust remaining on the black paper was counted. The dust generation property was evaluated according to the following criteria.
⊚: When the amount of paper dust is less than 5 ○: When the amount of paper dust is 5 or more and less than 10 ×: When the amount of paper dust is 11 or more

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

(Scraping property)
A groove having a depth of 3 mm and a width of 3 mm was provided on the plastic plate, 1 g of grease was dropped on the groove of the plastic plate, and wiping work was carried out by five monitors, and the scraping property was evaluated according to the following criteria.
⊚: When the number of respondents who answered “good scraping” is 4 or more and 5 or less 〇: When the number of respondents who answered “good scraping” is 1 or more and 3 or less ×: “Scraping property” When no one answered "I like it"

From Table 1, it can be seen that the paper wiper of the present invention maintains good adsorptivity and scraping property, and dust generation is sufficiently suppressed.

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

Claims (3)

A paper wiper consisting of a 1-ply sheet that is stacked and stored in a box-shaped container.
The paper wiper has a plurality of crepes due to 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.
The paper wiper installed on the sample table is pushed by the tissue softness measuring device TSA from above with a pushing pressure of 100 mN, and then rotated at a rotation speed of 2.0 / sec to vibrate the sample table. When measured with a vibration sensor, the intensity (TS7) of the maximum peak of the spectrum including 6500 Hz automatically acquired by the software on the tissue softness measuring device TSA is 30 dBV ² rms or more and 35 dBV ² rms or less, which is low. A paper wiper having a maximum peak intensity (TS750) of the first spectrum from the frequency side of 35 dBV ² rms or more and 40 dBV ^{2 rms or less.} The paper wiper according to claim 1, which contains 70% by mass or more and 100% by mass or less of softwood bleached kraft pulp. A web that constitutes a sheet of paper wiper is produced, and the web is dried with a Yankee dryer, creped by a crepe doctor, and then wound to produce an original roll.
The two raw fabric rolls are set in a rotary interfolder, and after collecting dust on both sides of the sheet of each raw fabric roll, they are folded by a rotary interfolder processing machine to manufacture a laminated body of paper wipers, and then. The method for producing a paper wiper according to claim 1 or 2, which is housed in the box-shaped container.

Images