JP5366596B2 - Industrial paper wipes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an industrial paper wipe having smoothness while keeping sufficient flexibility, and generating little paper powder. <P>SOLUTION: The industrial paper wipe is obtained by making a paper by adding 0.125-1.25 pts.mass of a wet paper-strengthening agent, and 0.1-0.25 pt.mass of a softener to 100 pts.mass of a constituent fiber, and subjecting the obtained paper to calender treatment. The pulp of the constituent fiber contains 70-100 pts.wt. of NBKP (Needle Bleached Kraft Pulp). The paper wipe is stored in a shape of a pop-up type and free from perforation. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to experiments in science / engineering / agriculture / medicine / pharmaceutics / home economics such as wiping and cleaning of physics and chemistry laboratory instruments and machines, and practical work on their extension (work using various chemistry, optics, and other precision instruments) Etc.) related to industrial paper wipes widely used.

  Industrial paper wipes used for physics and labware, machine blow-off, etc. are frequently used for wiping precision instruments and glassware, especially for wiping off dust, dirt, moisture, oil, etc. adhering to them. Therefore, for example, as shown in Patent Documents 1 to 3, industrial paper wipes excellent in low dust generation and liquid absorption have been used.

However, the industrial paper wipes disclosed in Patent Documents 1 to 3 are softened to improve the followability to the part shape, and are not stiff. Therefore, when performing a blow-off operation, the wrinkles easily come close to the contact surface with the object, so that dust or the like that has entered between the wrinkles does not get entangled with the fibers of the paper wipes, or liquid accumulates between the wrinkles. This could result in incomplete wiping.
Patent Document 4 discloses that a paper wipe containing 70 to 100% NBKP does not have the above-described problem and is excellent in oil wiping performance.

JP 2006-143254 A JP 2005-143523 A Japanese Patent Application Laid-Open No. 8-134664 JP 2009-7725 A

Conventional industrial paper wipes have a unique crepe shape in order to suppress the generation of paper dust while maintaining flexibility, have low adhesion to objects, and have insufficient moisture wiping performance. Moreover, the unevenness | corrugation by a crepe shape was large, and the target object might be damaged.
The present invention provides an industrial paper wipe that is smooth and retains sufficient flexibility while generating less paper dust.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
The constituent fiber is 100% pulp, and the pulp contains 70 to 100 parts by weight of NBKP (conifer kraft pulp),
Paper is made by adding 0.125 to 1.25 parts by weight of a wet paper strength enhancer and 0.01 to 0.5 parts by weight of a softening agent with respect to 100 parts by weight of the constituent fibers, and subjected to a calendar process. ,
The value of softness (handle ohmmeter method: according to JIS L 1096E) is 3.0 to 12.0 g, and the MMD value of each surface is in the range of 7.0 to 20.0.
Each paper wipe stored separately in units of use and stored separately is folded in half with the surface having the larger mean deviation (MMD) value of the friction coefficient of the wipe surface in the middle. It is piled up so that the surfaces folded into each other are in contact with each other and taken out by pop-up when used,
Industrial paper wipes characterized by that.

(Function and effect)
By containing more NBKP, it becomes excellent in moisture absorption. Further, by making a paper by adding a softening agent to the constituent fibers and performing a calendering process, an industrial paper wipe having flexibility and smoothness can be obtained. The industrial paper wipe according to the present invention has flexibility and small surface irregularities, so that it easily adheres to the surface of the object, can absorb moisture quickly and sufficiently, and has excellent wiping performance. Moreover, it is hard to damage the delicate glass surface.

  Since industrial paper wipes are also used for cleaning precision equipment, it is necessary to make paper dust less likely to occur. The paper strength enhancer has a fixing effect, and its addition can suppress the generation of paper dust. However, the flexibility of the paper wipe may be reduced, and thus the wiping property may be reduced. By selecting a wet paper strength enhancer from among the paper strength enhancers and using it in combination with a softening agent, and optimizing the amount of both additives, it has sufficient flexibility and wiping performance, and generates paper dust. Less industrial paper wipes can be obtained.

In addition, industrial paper wipes mainly used in physics and chemistry equipment are difficult to store and pop up for each unit used due to their surface properties, and usually have a perforation for each unit used, and multiple units are connected. It was stored in. At the time of use, it was necessary to cut the perforation, which was a factor in generating paper dust.
Since the industrial paper wipe having the property according to claim 1 has high smoothness and high adhesion between papers, it is possible to perform pop-up for each unit of use without giving a perforation. Therefore, it is possible to avoid the occurrence of paper dust when the perforation is cut off.

Further, industrial paper wipes that have been subjected to a calendar process have the property of warping from the smaller surface (front surface) of the MMD toward the larger surface (back surface) of the MMD. A force is generated so that the surfaces folded inside are separated (paper wipe 11 in FIG. 1). In such a state, if the surfaces folded in are engaged with each other so that the surfaces are in contact with each other, the degree of adhesion between the stacked surfaces is lowered.
In order to facilitate the pop-up of industrial paper wipes, it is necessary to increase the degree of adhesion between the surfaces of the paper wipes in contact with each other. By folding paper wipes in half with the back side inward and meshing with each other (Fig. 2), the warping force works to increase the degree of adhesion between the contacted surfaces, making pop-up easier. To do.

[Invention of Claim 2 ]
The industrial paper wipe according to claim 1, wherein the crepe rate is 20 to 40%.
Crepe rate: ((peripheral speed of the dryer during papermaking) − (peripheral speed of the reel)) / (peripheral speed of the dryer during papermaking) × 100

(Function and effect)
The industrial paper wipe according to claim 2 has low surface irregularities and a low friction coefficient, and is highly flexible, and therefore has high adhesion to an object and high wiping performance.

  Since the generated paper dust is reduced by using the industrial paper wipe provided by the present invention, it is possible to improve the accuracy of analytical instruments and the like, and since it has flexibility and smoothness, It is also possible to prevent damage to precision instruments and glass instruments including the analytical instrument. Furthermore, since the industrial paper wipes have high wiping performance, the number of sheets used in one process can be reduced, which is economical.

It is a conventional example of the storage form of a paper wipe. The arrows in the figure indicate the direction in which the paper warps. It is an example of the storage form of the paper wipe in this invention. The arrows in the figure indicate the direction in which the paper warps.

<Composition and shape of paper wipe>
The wet paper strength enhancer is 0.125 to 1.25 parts by mass (more preferably 0.4 to 0.6 parts by mass) and the softening agent is 0.01 parts per 100 parts by mass of the constituent fibers of the industrial paper wipe. To 0.5 parts by mass (more preferably 0.15 to 0.22 parts by mass). As the wet paper strength enhancer, sponge, and as the softener, fatty acid ester softener, polyphosphate, quaternary ammonium salt type cationic surfactant, and the like are suitable.

  The constituent fibers preferably contain 70 to 100% by weight of NBKP for improving water absorption, more preferably 90% or more, and particularly preferably 100%. If there is a constituent fiber other than NBKP, it may be LBKP (hardwood kraft pulp), but there may be other non-wood pulp such as kenaf pulp and manila hemp, synthetic fibers such as polyester fiber, rayon fiber and acrylic fiber. Good.

  While the crepe rate of the conventional paper wipe is about 30, it is preferably 12 to 25 in the present invention. If it is less than 12, it becomes difficult to increase the softness and unsuitable for wiping, and if it exceeds 25, the MMD described later tends to be high.

  This industrial paper wipe has a characteristic softness (handle ohmmeter method: according to JIS L 1096E) value of 3.0 to 12.0 g, preferably 3.5 to 6.0 g. If the softness is less than 3.0 g, it is too soft and tends to wrinkle particularly when wet, and sufficient wiping performance may not be obtained. On the other hand, if it exceeds 12.0 g, it is too hard, and particularly when performing a wiping operation in a dry state, it is difficult to be deformed along the surface to be wiped, and sufficient wiping performance may not be obtained. In addition, the wipe is difficult to wipe due to being too hard. In addition, the adhesion between the sheets is lowered, making it difficult to pop up. The softness in the present invention is measured five times each in the vertical direction and the horizontal direction on the front side of 10 test pieces having a size of 10 cm in length and 10 cm in width using a handle ohmmeter (Kumaya Riki Kogyo Co., Ltd.). Each average value. At this time, the slot width (clearance) for pushing the blade is 5 mm, and the load is 25 g.

  The industrial paper wipe according to the present embodiment is characterized in that the average deviation of the coefficient of friction on the wipe surface (variation of surface roughness when the friction element is moved: MMD) is more preferably 7.0 to 20.0. Is 7.0-15.0. MMD is a value measured using “Friction Sense Tester KESSE” manufactured by Kato Tech Co., Ltd. At the time of measurement, 10 piano wires having a diameter of 5 mm are adjacent to each other, a unit bulging portion having a radius of curvature of the tip of 0.25 mm is adjacent to each other, and a continuous contact surface having a total width of 5 mm is provided. The length of 5 mm was moved 2 cm at a speed of 0.1 cm / second while applying a tension of 20 g / cm to the paper sample in the moving direction while contacting the paper sample with a contact pressure of 50 g. The friction coefficient is measured, and the friction coefficient is divided by the friction distance (movement distance = 2 cm).

  On the other hand, the number of plies in this industrial paper wipe is not particularly limited, but is preferably 3 plies or less. If it exceeds 3 plies, a gap is generated between the plies during the wiping operation, and wrinkles are easily generated.

<Calendar processing>
The industrial paper wipe of this embodiment has a higher smoothness than usual by being subjected to a calendar process. In the calendering process, known calenders usually used for manufacturing sanitary thin paper such as on-machine calender and ply machine calender can be used. A render is more preferable. A more suitable condition is the combined use of an on-machine calendar and a ply-machine calendar, and a paper wipe with a smoother and softer texture can be obtained. The calendar process is performed by adjusting the pressure so that the paper thickness does not fall excessively and falls outside the target paper thickness range.

<Storage form>
The paper wipe can be stored in a known package or a similar package such as a carton used for sanitary thin paper or the like, a vinyl package used for paper towels or the like.
The paper wipe according to the present invention is in a state where one surface is smoothed by the influence of the calendar process (the smoothed surface is the front surface and the other surface is the back surface). A paper wipe having such a structure is usually characterized by warping in the direction from the front surface to the back surface.
Usually, when sanitary thin paper or the like is stored in a carton, as shown in FIG. 1, a paper 11 folded in two with the front side in, and a paper 12 folded in two with the back side in are prepared. Then, they are sequentially stacked and stored so that they are alternately meshed so that the front surface and the back surface that are folded in contact with each other. However, in such a form, the degree of adhesion between the sheets may be reduced due to warping of the paper 12 to the outside in the package, and pop-up failure may occur.
In the present invention, as shown in FIG. 2, the paper wipes 22 and 23 folded with the back surface in the middle are overlapped so that they are alternately meshed so that the back surface and the back surface are in contact with each other. In this embodiment, since both the paper wipes 22 and 23 are warped inward, the sheets can be popped up to the end without being separated.

  Next, the wiping performance, pop-up, and paper dust amount of the examples and comparative examples of the present invention were tested. The test methods are as follows, and the physical properties, compositions and test results for each example are shown in Table 1. The paper quality data in the table are all data in the state of 1 ply (one sheet).

  In this example, sponge was used as the wet paper strength enhancer, and a fatty acid ester softener was used as the softener. In addition, cationic polyacrylamide was used as a dry paper strength enhancer in the table.

[Water wiping off]
300 μL of water is dropped on a 10 cm square surface-smooth acrylic plate, and a wiping operation is performed with the sample according to each example folded in four. In the evaluation, whether or not the moisture was wiped off was confirmed by visual observation, and the evaluation was made by a three-step evaluation (◎ can be wiped off, ○ can be wiped off normally, △ not enough).

[Pop-up]
The paper wipe is cut into a size of 198 mm in length and 90 mm in width, folded in a pop-up form, and stored in a general tissue carton used for sanitary thin paper. And, from the take-out port on the upper surface of the carton, samples are taken out one by one, all the paper wipes can be popped up, and ◎, and the number of sheets that could not be popped up is 1 to 2 ○, Three to five sheets were evaluated as Δ, and six or more sheets were evaluated as ×.

[Amount of paper dust]
The paper wipe is cut into a size of 198 mm in length and 90 mm in width, folded in a pop-up form, and stored in a general tissue carton used for sanitary thin paper. Twenty samples were taken out for 30 seconds one by one from the take-out port on the upper surface of the carton, and the total count of paper powder having a particle diameter of 10 μm to 100 μm scattered in the air was measured. The amount of paper dust was measured with a light scattering type automatic particle counter (KC-20A, manufactured by Lion Co., Ltd., JIS B 9923 tumbling method).

[Dry paper strength and wet paper strength]
The tensile strength according to JIS P 8113 was measured in the vertical and horizontal directions of the paper.

As shown in Table 1, the paper wipes according to Examples 1 to 3 had good wiping performance, whereas the paper wipes according to Comparative Examples 1 to 3 did not show sufficient wiping performance. . It has been found that smoothing by calendaring improves the wipe performance of paper wipes.
Since the paper wipe of Comparative Example 1 to which the dry paper strength enhancer was added became hard paper, it can be said that the use of the dry paper strength enhancer is not suitable for the present invention.
The paper wipe of Example 1 was able to pop up the paper wipe to the end without perforation, but there were paper wipes that could not be popped up well in Examples 2 and 3. By using an on-machine calendar and a ply-machine calendar together, a soft and low MMD, that is, a smooth and soft paper wipe is obtained, and it is clear that such a paper wipe is suitable for pop-up. It was.
In Comparative Example 3, since it has a perforation, it is possible to pop up to the end, but since a lot of paper dust is generated, a paper wipe without perforation is suitable for preventing paper dust. I can say that.

Claims (2)

The constituent fiber is 100% pulp, and the pulp contains 70 to 100 parts by weight of NBKP (conifer kraft pulp),
Paper is made by adding 0.125 to 1.25 parts by weight of a wet paper strength enhancer and 0.01 to 0.5 parts by weight of a softening agent with respect to 100 parts by weight of the constituent fibers, and subjected to a calendar process. ,
The value of softness (handle ohmmeter method: according to JIS L 1096E) is 3.0 to 12.0 g, and the MMD value of each surface is in the range of 7.0 to 20.0.
Each paper wipe stored separately in units of use and stored separately is folded in half with the surface having the larger mean deviation (MMD) value of the friction coefficient of the wipe surface in the middle. It is piled up so that the surfaces folded into each other are in contact with each other and taken out by pop-up when used,
Industrial paper wipes characterized by that. The industrial paper wipe according to any one of claims 1 to 5, wherein a crepe rate is 20 to 40%.
Crepe rate: ((peripheral speed of the dryer during papermaking) − (peripheral speed of the reel)) / (peripheral speed of the dryer during papermaking) × 100

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