JP6935628B2 - Industrial wipers and their manufacturing methods - Google Patents

Description

The present invention relates to an industrial wiper in which the sheet is hard to peel off and has an excellent adsorption amount and wiping property.

Industrial wipers are mainly used for wiping work, and their functions such as adsorptivity and scraping property are required. Among them, when the object to be wiped is a large amount of liquid material, durability is required in addition to adsorptivity. Therefore, these functions can be obtained by increasing the number of laminated sheets or embossing. Attempts have been made to grant.

As for industrial wipers, products with various embossing patterns are on the market, but these can be broadly classified into two types. The first of these is an industrial wiper that forms an uneven mold on the embossed roll and gives an embossed pattern (matched embossing) with a push mold while plying up (see, for example, Patent Document 1). The second is an industrial wiper that uses needle-shaped rolls to ply up while making holes in the sheet (pin embossing).

JP-A-2010-233970

The matched embossed industrial wiper has a better adsorption amount than the pin embossed industrial wiper because it can hold the wiped object between the plies when wiping the liquid wiped object. There is also a problem that peeling is likely to occur between the plies. For this reason, peeling of the ply is suppressed by strongly applying unevenness, but in such a case, there is a problem that each sheet is crushed and the amount of adsorption is reduced.

Therefore, an object of the present invention is to provide an industrial wiper in which the sheet is difficult to peel off and the amount of adsorption and wiping property are excellent.

In view of the above problems, the inventors of the present invention have conducted diligent research. As a result, in an industrial wiper in which a single sheet is laminated in 4 plies or more and a matched embossed pattern is given, the paper thickness of the single sheet, the density of the embossed pattern, and the surfaces constituting the front surface and the back surface of the industrial wiper. We have found that the above problems can be solved by adjusting the properties of the above, and have completed the present invention. Specifically, the present invention provides the following.

(1) An industrial wiper in which a single sheet is laminated in 4 plies or more and an embossed pattern is imparted. The single sheet has a paper thickness of 120 μm or more and 160 μm or less, and the embossed pattern is matched. It is an embossed pattern, and the density of the embossed pattern is 12 pieces / cm ² or more and 20 pieces / cm ² or less. was determined by tissue softness measuring apparatus TSA, TS7 is less 15dBV ² rms or more 30dBV ² rms, TS750 is below 150dBV ² rms or more 330dBV ² rms, industrial wipers.

(2) The industrial wiper according to (1), wherein the basis weight of a single sheet is 15 g / m ² or more and 25 g / m ^{2 or less.}

(3) The industrial wiper according to (1) or (2), wherein the water retention amount TWA is 250 g / m ² or more and 400 g / m ^{2 or less.}

(4) The industrial wiper according to any one of (1) to (3), wherein the oil retention amount TOA is 330 g / m ² or more and 450 g / m ^{2 or less.}

(5) A step of laminating a continuous sheet having a crepe unwound from the primary raw fabric roll in 4 plies or more and winding the laminated continuous sheet around the secondary original fabric roll, and the most of the secondary original fabric rolls. Among the continuous sheets constituting the outer layer, the step of inverting the front and back of the continuous sheet of 3 plies or less by feeding out only the continuous sheet of 3 plies or less, the continuous sheet with the front and back inverted, and the front and back are inverted. The step of feeding out the non-continuous sheet together to give an embossed pattern, and folding the continuous sheet to which the embossed pattern is given into four while cutting, according to any one of (1) to (4). A method for manufacturing an industrial wiper, which comprises a process of obtaining an industrial wiper.

In the industrial wiper of the present invention, matched embossing is applied in a state where a single sheet of 4 plies or more is laminated, and the density of the embossed pattern of the matched embossing is adjusted to be within a predetermined range. Therefore, it is difficult for each single sheet to peel off, and the wiping property is good due to the convex portion of the embossed pattern. Further, in the industrial wiper of the present invention, the paper thickness of a single sheet, the density of the embossed pattern, and the properties of the surfaces constituting the front surface and the back surface of the industrial wiper are adjusted. Therefore, the industrial wiper of the present invention has excellent adsorptivity and wiping property.

It is a drawing which shows the shape and dimension of a general matched embossing pattern exemplarily.

Hereinafter, the present invention will be described in detail.

<Industrial wiper>
The industrial wiper of the present invention is one in which a single sheet is laminated in 4 plies or more and has an embossed pattern.

[Single sheet]
As the single sheet used for the industrial wiper, it is preferable to use a paper machine made of pulp fiber, but in order to make the single sheet thicker and to have good adsorptivity and wiping property, it is dried at the time of paper making. It is preferable to add a paper strength enhancer and a wet paper strength enhancer internally. In forming a single sheet, it is preferable to appropriately adjust the basis weight by adjusting the paper making method, the type and amount of the additive, etc., but the single sheet is measured in accordance with JIS P 8124. The basis weight of the sheet ^{is preferably in the range of 15 g / m 2} or more and 25 g / m ² or less, and more preferably in the range of 18 g / m ² or more and 20 g / m ² or less.

(Paper thickness)
The paper thickness of the single sheet is 120 μm or more and 160 μm or less, preferably 130 μm or more and 160 μm or less, and more preferably 140 or more and 155 or less. By setting the paper thickness of the single sheet within the above range, the strength of the single sheet can be made sufficient, and the adsorptivity and wiping property of the industrial wiper can be maintained well. can. Further, if the paper thickness is not higher than necessary, it is not necessary to strongly emboss the paper, and the decrease in adsorptivity due to this can be suppressed.

(Pulp fiber)
As the pulp fiber, it is preferable to use wood pulp fiber produced from coniferous tree, and for example, it is preferable to use coniferous tree bleached kraft pulp fiber (NBKP) which is a bleached pulp fiber obtained by bleaching and purifying the pulp fiber. By using softwood bleached kraft pulp fiber as the main raw material of pulp fiber, it is possible to effectively suppress dust generation and further improve paper strength and water absorption. The pulp fiber may be blended with wood pulp fiber produced from hardwood, or hardwood bleached kraft pulp fiber (LBKP) may be used. In that case, it is preferable to use NBKP in an amount of 70% by mass or more and 100% by mass or less, and it is preferable to use LBKP in an amount of 0% by mass or more and 30% by mass or less.

In preparing a single sheet, other fibers may be appropriately blended in addition to the wood pulp fibers as long as the object of the present invention is not impaired. Such other fibers include, for example, mechanical pulp fibers such as crushed wood pulp fibers (GP); chemical pulp fibers such as sulfite pulp fibers; semi-chemical pulp fibers obtained by combining chemical treatment and mechanical treatment; Kenaf. , Cotton linter, non-wood pulp fiber such as hemp; used paper pulp fiber and the like.

(Dry paper strength enhancer and wet paper strength enhancer)
Examples of the dry paper strength enhancer that can be used in the present invention include cationized starch, polyacrylamide, carboxymethyl cellulose and the like. In addition, examples of the wet paper strength enhancer that can be used in the present invention include polyamide epichlorohydrin resin and melamine resin. The amount of the dry paper strength enhancer and the wet paper strength enhancer added is preferably 0.1 part by mass or more and 2.0 parts by mass or less per 100 parts by mass of the pulp fiber.

(Crepe rate)
In the present invention, it is preferable that the crepe ratio at the time of drying a single sheet of paper is 20% or more. By setting the crepe ratio to 20% or more, the strength and water absorption of the single sheet can be improved. The crepe rate (%) is calculated by {(dryer speed) − (reel speed)} / (dryer speed) × 100. Here, the reel speed means the winding speed to the roll.

[Industrial wiper]
The industrial wiper constituting the roll body of the industrial wiper of the present invention is obtained by laminating the above single sheets in 4 plies or more, and one surface of the industrial wiper has an embossed convex portion and the other. The front surface has an embossed recess formed by the back surface of the embossed convex portion. The industrial wiper of the present invention is preferably a stack of 4-ply single sheets.

(Embossing)
When embossing, a laminated sheet in which a single sheet is laminated is embossed, and an embossed convex portion is formed on one surface of an industrial wiper, and an embossed concave portion formed on the back side of the embossed convex portion is formed on the other surface. Form. The embossing process is performed by a "matched" embossing roll (matched embossing pattern) in which a male (convex) embossing roll and a female (concave) embossing roll having almost complementary shapes mesh with each other. Since the industrial wiper has the matched embossing pattern, the object to be wiped can be held between the single sheets, and the adsorption amount of the industrial wiper is further improved. Further, since the industrial wiper has the matched embossing, it is possible to effectively prevent the peeling of the single sheet.

(Density of embossed pattern)
The density of the embossed pattern ^{is preferably 12 pieces / cm 2} or more and 20 pieces / cm ² or less, and more preferably 13 pieces / cm ² or more and 18 pieces / cm ² or less. When the density of the embossing pattern is within the above range, it is possible to prevent the industrial wiper from peeling off to each single sheet without strongly embossing, so that the paper thickness of the single sheet Can be kept high, whereby the adsorptivity and wiping property of the industrial wiper can be well maintained.

(Embossed area ratio)
The embossed area ratio of the embossed convex portion in each single sheet is preferably 30% or more and 60% or less, and more preferably 40% or more and 50% or less. By setting the embossed area ratio within the above range, the adsorptivity and the strength of the industrial wiper are balanced. The embossed area ratio of the embossed convex portion is obtained by measuring the area of the embossed portion applied on a single sheet (Sn = a × b × n in FIG. 1; n is the total number of embossed patterns) and the area thereof. It can be calculated as a rate (Sn / (A × B)).

(Embossed edge rate)
The embossed edge ratio of each single sheet ^{is preferably 0.7 mm / mm 2} or more and 1.3 mm / mm ² or less, and 0.9 mm / mm ² or more and 1.1 mm / mm ² or less. More preferred. By setting the embossed edge ratio within the above range, the adsorptivity and the strength of the industrial wiper are balanced. The embossed edge ratio is obtained by the total of each side of the embossed convex portion per unit area, and is calculated by (a × 2 + b × 2) × n / (A × B) with reference to FIG. NS.

(TS7 value, TS750 value, D value by TSA)
Industrial wipers of the present invention, 4 out of the plies or sheets of each side, the surfaces constituting the front and back surfaces of industrial wipers was measured by Tissue Softness measuring device, TS7 is 15dBV ² rms or more 30dBV ² rms less and, preferably 16dBV at ² rms or more 28dBV ² rms or less, TS750 is less 150dBV ² rms or more 330dBV ² rms, preferably at most 160dBV ² rms or more 330dBV ² rms. Further, the industrial wiper of the present invention has a D value of 1.7 mm / N or more and 3.0 mm / N or less as measured by a tissue softness measuring device on the surfaces constituting the front surface and the back surface of the industrial wiper. Is preferable. Here, the TS7 value is the softness of each sheet, the TS750 value is the smoothness of each sheet, and the D value is a parameter indicating the rigidity of each sheet. Using the tissue softness measuring device TSA (Tissue Software Analyzer). Can be measured. The tissue softness measuring device TSA softens non-woven fabrics, etc. by analyzing vibration data detected by various sensors and parameterizing (TS value) when a rotor with a blade rotated from above a single sheet is pressed. It quantitatively evaluates the ness (feeling of touch), and is a product name manufactured by Emtec Electrical GmbH of Germany (the Japanese distributor is Nihon Rufuto Co., Ltd.).

By setting the TS7 value within the above range, both the front and back surfaces of the industrial wiper are not too soft and not too hard, and have good softness, and the adsorptivity and wiping property of the industrial wiper are improved. Further, by setting the TS750 value within the above range, the smoothness of both the front and back surfaces of the industrial wiper is maintained in an appropriate range, and the wiping property is maintained well. Further, by setting the D value within the above range, the rigidity of the industrial wiper becomes appropriate, and dirt on various parts including dirt on fine parts can be suitably wiped off.

In the present invention, in particular, in order to keep the TS7 value and the TS750 value on both the front and back sides of the industrial wiper within the above values, in the method for manufacturing the industrial wiper described later, the outermost layer of the secondary raw fabric roll is used. The Yankee surface that was in contact with the Yankee dryer when the single sheet was dried by partially feeding out only the continuous sheets of 3 plies or more and inverting the front and back of only the continuous sheets of 3 plies or more. The work may be performed so that the hood surface, which is the opposite surface, is on the outside. As a result, the more grainy hood surface constitutes both the front and back surfaces of the industrial wiper, and the above-mentioned TS7 value and TS750 value conditions are satisfied.

(Water retention amount)
The industrial wiper of the present invention has a good water retention because a single sheet has a predetermined paper thickness and a matched embossing pattern of a predetermined density. Water retention capacity of industrial wiper (TWA: Total Water Absorbency) is preferably at 250 g / ^{m 2} or more 400 g / ^{m 2} or less, more preferably 300 g / ^{m 2} or more 380 g / ^{m 2} or less. Although it is possible to increase the water retention capacity by increasing the basis weight of the single sheet, when the embossing pattern is strongly applied due to the increase in the paper thickness of the single sheet before embossing. On the contrary, the amount of water retained may decrease.

The amount of water retained can be determined according to the following measuring method. First, an industrial wiper is cut into a square of 76 mm × 76 mm to prepare a sample, and the dry weight is measured. Next, after immersing this sample in distilled water for 2 minutes, in a container saturated with water vapor (RH100%), one corner of the sample is set to be the upper top, and two corners adjacent to this top. Suspend in a stretched state while supporting the part, leave it for 30 minutes, and measure the weight after draining. Then, the measured value is converted into the water retention amount (g / m ^{2 ) per 1 m 2 of the sample.}

(Oil retention amount)
Further, the industrial wiper of the present invention has a good oil retention amount because a single sheet has a predetermined paper thickness and a matched embossing pattern of a predetermined density. Oil-retaining amount of industrial wipers of the present invention (TOA: Total Oil Absorbency) is more that it is 330 g / ^{m 2} or more 450 g / ^{m 2} or less is preferable, 330 g / ^{m 2} or more 400 g / ^{m 2} or less preferable. Although it is possible to increase the oil retention amount by increasing the basis weight of the single sheet, the embossing pattern was strongly applied as the paper thickness of the single sheet before embossing increased. In that case, the amount of oil retained may decrease.

The amount of oil retained can be determined according to the following measuring method. First, an industrial wiper is cut into a square of 76 mm × 76 mm to prepare a sample, and the dry weight is measured. Next, after immersing this sample in oil for 2 minutes, in a container saturated with water vapor (RH100%), one corner of the sample is set to be the upper top, and two corners adjacent to this top. The portion is supported and hung in a stretched state, left for 30 minutes, and the weight after oil drainage is measured. Then, the measured value is converted into the oil retention amount (g / m ^{2 ) per 1 m 2 of the sample.} As the oil, Nippon Oil Machinery Oil (FBK-100) was used.

<Manufacturing method of industrial wiper>
The industrial wiper of the present invention includes a step of laminating a continuous sheet having a crepe unwound from a primary fabric roll in 4 plies or more and winding the laminated continuous sheet onto a secondary fabric roll. Among the continuous sheets constituting the outermost layer of the original roll, a step of inverting the front and back of the continuous sheet of 3 plies or less by feeding out only the continuous sheet of 3 plies or less, a continuous sheet in which the front and back are inverted, and a continuous sheet. A step of feeding out a continuous sheet whose front and back are not inverted together to give an embossed pattern, and a step of cutting the continuous sheet to which the embossed pattern is given and folding it in four to obtain the above-mentioned industrial wiper. And have at least. Hereinafter, the method for manufacturing the industrial wiper of the present invention will be described in detail.

Generally, in the production of industrial wipers, paper making, creping, ply-up, embossing and cutting, and folding can be performed in this order.

[Paper]
The single sheet used in the industrial wiper of the present invention can be made by a conventional method using a paper machine. The papermaking speed / wire speed (J / W ratio) at the time of papermaking may be set from 0.9 to 1.00 based on a known technique. Further, in producing a single sheet of an industrial wiper, a wet paper strength enhancer or a dry paper strength enhancer may be added to the paper slurry as necessary.

[Creaping]
Further, in the present invention, it is preferable to perform a crepe treatment (crepe) in order to impart softness and bulk to the industrial wiper. Here, the crepe treatment is a method of mechanically compressing paper in the MD direction (machine running direction) to form wrinkles called crepes, which are bulky, soft, and water-absorbent. , The smoothness of the surface, the aesthetic appearance (shape of the crepe), etc. are imparted. Specifically, in the drying process after fabrication, the crepe is formed by the crepe doctor by setting the speed difference between the Yankee dryer and the reel so that the speed of the reel becomes slower than the speed of the Yankee dryer. ..

The crepe rate based on the speed difference between the Yankee dryer and the reel is defined by the following equation.
Crepe rate (%) = 100 x (Yankee dryer speed (m / min) -reel speed (m / min)) ÷ reel speed (m / min)

In the present invention, the crepe ratio is preferably 20% or more and 50% or less, and more preferably 30% or more and 45% or less. The continuous sheet having the crepe is wound up as a primary raw fabric roll and sent to the next process.

[Ply up]
In the present invention, since the single sheet constituting the industrial wiper is laminated in 4 plies or more, it is laminated in a plurality of plies of 4 plies or more by a ply machine. More specifically, a continuous sheet having a crepe unwound from the primary raw fabric roll was laminated in 4 plies or more, and the laminated continuous sheet was wound up on the secondary original fabric roll to be plyed up. Obtain a secondary crepe roll of continuous sheet.

[Invert continuous sheet]
Here, in the present invention, it is preferable that the hood surface of each single sheet constitutes both the front and back surfaces of the industrial wiper, and the Yankee surface faces the inside of the industrial wiper. Therefore, when the secondary raw fabric roll is formed, among the continuous sheets constituting the outermost layer of the secondary raw fabric roll, only the continuous sheet of 3 plies or less is fed out to form the continuous sheet of 3 plies or less. It is preferable to invert the front and back. As a result, the Yankee surface of the partially extended continuous sheet of 3 plies or less and the remaining continuous sheet that has not been extended face each other, and the hood surface is exposed to the outside.

[Embossing, cutting, folding]
Both the continuous sheet with the front and back inverted and the continuous sheet with the front and back not inverted are unwound from the secondary raw fabric roll, and the entire surface of the laminated continuous sheet is embossed. Then, a slit having the dimensions of an industrial wiper is made in the continuous sheet to which this embossed pattern is given, parallel to the MD direction, cut in parallel to the CD direction, folded in four by a rotary interfolder, and a plurality. The sheets may be stacked.

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 4>
A single sheet having a basis weight shown in Table 1 was manufactured and wound up to obtain a primary raw fabric roll. Next, four plies of the continuous sheets fed out from the primary raw fabric roll were laminated to form a laminated continuous sheet, which was wound around the secondary original fabric roll. Of the continuous sheets constituting the outermost layer of the secondary raw fabric roll, only the 2-ply continuous sheet was partially fed out for one round of the roll, and the front and back sides of the 2-ply continuous sheet were reversed. A continuous sheet with the front and back inverted and a continuous sheet with the front and back not inverted are fed together and subjected to matched embossing or pin embossing by an embossing machine, and the density of the embossed pattern is 4.8 pieces / cm ² 14.0 pieces / cm ^2, 60% embossed area ratio is 30%, the embossed edge rate to form embossed pattern so that the 0.7 mm / mm ² or 1.3 mm / mm ^2. This was cut in the MD direction and the CD direction and folded in four to obtain an industrial wiper. For the above industrial wipers, the paper thickness, TOA, TWA, and TS7 value, TS750 value, and D value measured by TSA were measured. In addition, a monitor test was conducted based on the following criteria for wipeability and firmness. The above results are shown in Table 1.

<Evaluation>
[Paper thickness]
The thickness of the single sheet was measured using a thickness gauge (manufactured by Ozaki Seisakusho, dial thickness gauge "PEACOCK"). A sample (10 paper towels) was placed between the stylus and the measuring table with a measuring load of 3.7 kPa and a stylus diameter of 30 mm, and the gauge when the stylus was lowered at a speed of 1 mm or less per second was read. The measurement was repeated 10 times and the values obtained were averaged.

[Wipeability]
1 g of grease was poured on a plastic plate, and the wiping work was carried out by 5 monitors, and the wiping property was evaluated according to the following criteria.
☆: Very good ◎: Better 〇: Good △: Slightly bad ×: Bad

[Solid feeling]
30 mL of water was randomly sprinkled on the plastic plate, and the wiping work was carried out by 5 monitors, and the feeling was evaluated firmly according to the following criteria.
☆: Very good ◎: Better 〇: Good △: Slightly bad ×: Bad

As can be seen from Table 1, by setting the density of the embossed pattern to 12 pieces / cm ² or more and the paper thickness to 140 μm or more, an industrial wiper having excellent adsorptivity was obtained. Furthermore, by adjusting the basis weight, the adsorption effect was adjusted in a well-balanced manner.

Regarding wiping property, in general, when wiping a highly viscous object, the wiping work is performed by pressing the sheet to be contacted against the object, but in order to perform the wiping work without applying a load, point contact is performed. The scraping property is important. Here, by setting the density of the embossed pattern to 12 pieces / cm ² or more, the scraping property became good and the wiping property became good.

As for the firmness, in general, when the amount of the object to be wiped is large and the viscosity is low, the sheet tends to get twisted due to getting wet, which makes the wiping operation difficult. Here, by increasing the paper thickness of the single sheet to 120 μm or more, the sheet becomes fluffy and the wiping property is improved.

Further, in the industrial wiper of the present invention, as seen in the numerical values of the TS7 value and the TS750 value, the surface has fine irregularities, so that the wiper of the industrial wiper has better wiping property. It became.

Claims (5)

An industrial wiper in which a single sheet is laminated in 4 plies or more and an embossed pattern is given.
The paper thickness of the single sheet is 120 μm or more and 160 μm or less.
The embossed pattern is a matched embossed pattern.
The density of the embossed pattern is 12 pieces / cm ² or more and 20 pieces / cm ² or less.
4 of plies or sheets of each side, the surfaces constituting the front and back surfaces of industrial wipers was measured by Tissue Softness measuring apparatus TSA, TS7 is less 15dBV ² rms or more 30dBV ² rms, TS750 is 150dBV ^An industrial wiper having a ^{root mean square of 2} rms or more and 330 dBV or less of 2 rms. The industrial wiper according to claim 1, wherein the basis weight of the single sheet is 15 g / m ² or more and 25 g / m ^{2 or less.} The industrial wiper according to claim 1 or 2, wherein the water retention amount TWA is 250 g / m ² or more and 400 g / m ^{2 or less.} The industrial wiper according to any one of claims 1 to 3, wherein the oil retention amount TOA is 330 g / m ² or more and 450 g / m ^{2 or less.} A process of laminating a continuous sheet having a crepe unwound from the primary raw fabric roll in 4 plies or more and winding the laminated continuous sheet around the secondary original fabric roll.
A step of inverting the front and back of the continuous sheet of 3 plies or less by feeding out only the continuous sheet of 3 plies or less among the continuous sheets constituting the outermost layer of the secondary raw fabric roll.
A process of feeding out a continuous sheet whose front and back sides are inverted and a continuous sheet whose front and back sides are not inverted to give an embossing pattern.
A method for manufacturing an industrial wiper, which comprises a step of cutting a continuous sheet to which an embossed pattern is given and folding it in four to obtain an industrial wiper according to any one of claims 1 to 4.

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