JP2011212109A - Paper wiping sheet and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive paper wiping sheet and a method of manufacturing the paper wiping sheet.SOLUTION: The paper wiping sheet is formed by applying a resin to the front surface and/or back surface of a base material sheet made of pulp.

Description

  The present invention relates to a paper wiping sheet and a method for producing a paper wiping sheet.

  Conventionally, a wiping sheet made of a non-woven fabric has been used as a base wiping application (for example, Patent Document 1). Such a wiping sheet is composed of, for example, a nonwoven fabric sheet with a binder applied to the front and back surfaces, and is characterized by being repeatedly washable and having good drying properties.

JP 2008-213194 A

However, since the wiping sheet described above is composed of a non-woven fabric, there is a problem that the cost is higher than that of paper.
On the other hand, when paper is used as a material, there is a problem that the washing durability is extremely inferior to that of a nonwoven fabric.
By the way, in the market, because of the hygiene aspect and the complexity of the washing work, it is cheaper to wipe off the sheet after it has been washed several times and then discarded after using it. Needs for seats are high.

  An object of the present invention is to provide an inexpensive paper wiping sheet and a method for producing a paper wiping sheet.

  In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that, in the paper wiping sheet, a resin is applied to the front surface and / or the back surface of the base sheet made of pulp. And

  The invention according to claim 2 is the paper wiping sheet according to claim 1, wherein the base sheet is formed by laminating a plurality of pulp layers.

  The invention according to claim 3 is characterized in that in the paper wiping sheet according to claim 2, the base sheet is laminated.

  The invention according to claim 4 is the paper wiping sheet according to any one of claims 1 to 3, wherein the resin is a thermosetting resin.

  Invention of Claim 5 is the manufacturing method of the paper wiping sheet | seat, the coating process which applies resin to the surface and / or back surface of the base material sheet comprised with the pulp, and the base material by which resin was apply | coated And a laminating process for laminating the sheet.

According to invention of Claim 1, since the pulp is used as a base material sheet, it can manufacture cheaply compared with what used the nonwoven fabric.
Moreover, since resin is apply | coated to the surface and / or the back surface, compared with the case of only a base material sheet, washing durability improves.

  According to the invention described in claim 2, since the base sheet is formed by laminating a plurality of pulp layers, moisture can be held between the pulp layers, and moisture absorption performance can be improved.

  According to the invention described in claim 3, since the base material sheet is laminated, the adhesion between the layers can be maintained, and the surface area can be increased to further improve the moisture absorption.

  According to invention of Claim 4, since resin is a thermosetting resin, it can protect a surface layer and can improve washing durability.

  According to the invention of claim 5, it is possible to obtain the same effect as that of claim 1, and since the lamination is applied after the resin is applied to the base sheet, the resin is applied. Compared with the case where it is previously laminated, the resin can be uniformly applied to the surface of the base sheet, and the quality can be stabilized.

  Hereinafter, embodiments of the paper wiping sheet according to the present invention will be described in detail.

The paper wiping sheet is composed of a base sheet made of pulp and a resin layer in which a resin is applied to the surface of the base sheet.
The base sheet according to the present invention is not limited to a single layer structure, and may be a sheet having a laminated structure in which a plurality of pulp layers are laminated.

The base sheet can be formed, for example, by paper making using a known wet paper making technique. That is, it can be formed by making a papermaking raw material containing pulp and additives into a wet paper state and then drying it with a dryer or the like.
Pulp is, for example, mechanical pulp such as groundwood pulp (GP), pressure-rise groundwood pulp (PGW), thermomechanical pulp (TMP), high yield unbleached kraft pulp (HNKP; N material), softwood bleached craft. Chemical pulp such as pulp (NBKP; N material, NB material), hardwood unbleached kraft pulp (LUKP; L material), hardwood bleached kraft pulp (LBKP, L material), deinking pulp (DIP), waste pulp (WP) Used paper pulp, semi-chemical pulp (CP), etc. can be used, and one or two or more of these pulps can be appropriately selected and used.

Usually, a chemical pulp containing no filler or foreign matter is suitable, and it is particularly preferable to use 100% by mass of NBKP, but it is possible to partially incorporate LBKP.
In general, NBKP is longer and thicker than LBKP, so the more NBKP, the higher the strength and bulkiness, the better the water absorption and oil absorption, and the retention of moisture and oil. Will also be good. In addition, when mixing and using NBKP and LBKP, it is preferable that the compounding quantity of NBKP is 70 mass% or more.
The base sheet is preferably creped. Thereby, in addition to softening and increasing the bulk, the surface becomes uneven, thereby increasing the liquid absorption rate.
In addition to the pulp, papermaking chemicals such as a wet paper strength agent, a sticking agent, an adhesive, and a release agent may be appropriately used for the base sheet.

In addition, when using the base material sheet which laminated | stacked the pulp layer, each pulp layer is integrated and the sheet | seat 1 for paper wiping is formed by performing a lamination process. The basis weight of the paper wiping sheet 1 is preferably 20 g / m ² or more and 200 g / m ² or less. This is because if it is less than 20 g / m ² , the absorption performance cannot be ensured, and if it exceeds 200 g / m ² , it becomes bulky, making it difficult to perform wiping work.

  Specifically, lamination in the thickness direction can be performed by lamination using PVA or CMC, ultrasonic sealing, or the like. Lamination is performed by pressing the target sheet between a pair of embossed rolls or plates with a corresponding concavo-convex pattern, or between an embossing roll or plate with a concavo-convex pattern and a roll or plate without a concavo-convex pattern. This is a process of bonding the papers together while forming an uneven pattern on the target sheet.

As the resin layer applied to the surface of the base sheet, for example, an emulsion resin can be used. Examples of the resin include thermosetting resins such as acrylic resins, acrylic ester copolymer resins, polyurethane resins, vinyl acetate copolymer resins, epoxy resins, and styrene-acrylic copolymer resins, but are not limited thereto. Absent.
In addition, a resin layer may be provided on both surfaces of the base sheet, or a resin layer may be provided only on one surface. Moreover, when providing a resin layer on both surfaces of a base material sheet, it is not necessary to use the same resin for both. In particular, a corrugated pattern with a visually attractive appearance can be obtained by mixing a colorant such as a dye on one surface. As the dye, a known dye used for coloring a resin can be used.

As a method for forming the resin layer, coating by a coating machine, printing by a printing machine, a dipping method, a spraying method, or the like can be used. An immersion method is particularly preferred.
In addition, when forming a pattern like a wavy line, the application | coating by a spray method, a coating machine, and the printing by a printing machine is suitable rather than the immersion method.

The amount of resin applied is, for example, in the range of 0.5 to 5.0 g / m ² . When the coating amount is less than 0.5 g / m ² , the resin may not be uniformly applied to the entire fiber and may be partially weakened. Therefore, fluffing is likely to occur and it can be used for repeated washing. Because there may be no. On the other hand, when the coating amount exceeds 5.0 g / m ² , the paper wiping sheet itself becomes hard and the feel of the hand becomes worse, and it is not possible to flexibly cope with the delicate unevenness of the object to be wiped, and the wiping effect is reduced. Because it will end up.

Next, a method for producing a paper wiping sheet will be described.
First, a base sheet formed of a single pulp layer or a plurality of pulp layers is produced. Next, a resin is applied to the base sheet (resin application step). Next, laminating is performed in the thickness direction of the base sheet (laminating process).
The reason why the resin is applied before the compression heating process is that if the resin is applied after the compression heating process, the resin layer may become non-uniform.

  EXAMPLES Next, although an Example and a comparative example are given and this invention is demonstrated more concretely, of course, this invention is not limited to these Examples. In addition, unless otherwise indicated,% in an example shows the mass%.

[Example 1]
NBKP: LBKP = 9: 1 was used as the pulp.
The resin applied on one side is an acrylic resin, and the actual application amount (application amount / solid content) is 1.47 g / m ² .
The resin was applied by gravure printing.
The product tsubo was measured according to JIS P 8124 (1998). The multilayer structure was tested as it was.
The paper thickness is measured using a dial thickness gauge (thickness measuring instrument) “PEACOCK G type” (Ozaki Seisakusho) under the conditions of JIS P 8118 (1998). Specifically, confirm that there is no dust or dust between the plunger and the measurement table, lower the plunger on the measurement table, move the memory of the dial thickness gauge to adjust the zero point, Raise the plunger, place the sample on the test bench, slowly lower the plunger perpendicular to the paper surface, and read the gauge at that time. At this time, only the plunger is placed. The terminal of the plunger is made of metal so that a plane with a diameter of 10 mm is perpendicular to the plane of the paper, and the load at the time of measuring the paper thickness is about 70 gf. The paper thickness is an average value obtained by performing measurement 10 times.
[Example 2]
The only difference from Example 1 is that the amount of resin applied is 1.70 g / m ² , and the other conditions and measurement method are the same as in Example 1.
[Example 3]
The difference from Example 1 is that NBKP: LBKP = 9: 1 is used as the pulp and a two-layer structure is used.
The resin applied to the surface layer is an acrylic resin, and the actual coating amount (coating amount / solid content) is 4.24 g / m ² .
[Comparative Example 1]
It is a so-called generally commercially available wiping sheet (manufactured by Daio Paper Co., Ltd .: Eliere Countercloth). An acrylic resin was applied as a resin to a 100% rayon nonwoven fabric. The actual coating amount (coating amount / solid content) is 12.93 g / m ² (both sides).
The resin was applied by roll transfer.
Other conditions and measurement methods are the same as in Example 1.
[Comparative Example 2]
The only difference from Examples 1 and 2 is that no resin is applied to the surface layer. Other conditions and measurement methods are the same as in Example 1.
[Comparative Example 3]
The only difference from Example 3 is that no resin is applied to the surface layer, and other conditions and measurement methods are the same as Example 3.

<Water absorption test method>
(1) Test method Water absorption is measured by the following method. A test piece of 100 mm × 100 mm is immersed in water while being placed on a mesh made of wire at intervals of 20 mm in length and breadth. After the entire sheet piece is soaked, the net is lifted vertically, and then the water is naturally left for 30 seconds. Subtract the sheet weight before soaking in water from the sheet weight after cutting the water to calculate the absorbed water and express it in units of g / m ² .

表１に示すように、実施例１、２と比較例１を比べると、樹脂を塗布することによる吸水量の改善は認められない。
しかしながら、パルプ層を２層にすると、吸水量が著しく増え、また、樹脂を塗布することによる吸水量の増加が認められた。 (2) Test results

As shown in Table 1, when Examples 1 and 2 are compared with Comparative Example 1, no improvement in the amount of water absorption by applying the resin is observed.
However, when the pulp layer was made into two layers, the amount of water absorption increased remarkably, and the increase in the amount of water absorption due to the application of the resin was recognized.

<Drying test>
(1) Test method A test piece of 200 mm x 100 mm was sampled, wetted with a test piece, and hand-squeezed to contain 4 g (200 g / m ² ) of moisture per test piece. Temperature: 23 ° C, humidity: 34% RH Left alone.
Then, the weight (unit: g) of the test piece was measured every 10 minutes.
The results are shown in Table 2.

表２に示すように、実施例１，２と比較例１、２を比べると、乾燥性については、従来の不織布を用いた拭き取り用シートと略同等であることが分かる。 (2) Test results

As shown in Table 2, when Examples 1 and 2 are compared with Comparative Examples 1 and 2, it can be seen that the drying property is substantially the same as that of a wiping sheet using a conventional nonwoven fabric.

<Washing durability test>
(1) Test method Take a test piece 200mm x 100mm and place it in a laundry bucket containing 7 liters of water and 42 milliliters of hypochlorous acid ("Multi-washer MW-01" manufactured by Tomo no Farmer). Put in and wash for 15 minutes. A 15-minute wash was performed once and four consecutive times.
And after completion | finish of each time, the test piece was observed.
(2) Test results Comparative Example 1 showed almost no change as a result of washing 4 times.
When Examples 1 and 2 were compared with Comparative Example 2, as a result of washing 4 times, in Comparative Example 2 where no resin was applied, perforation and collapse were observed, but Example 1 where resin was applied , 2 showed no perforation. Thereby, the improvement of the washing durability by resin application was recognized.

<Comprehensive evaluation>
Table 3 shows the results of evaluating the characteristics of Examples 1 to 3 and Comparative Examples 1 to 3 based on the test results.

評価は、比較例１、即ち、従来の不織布からなる拭き取り用シートとの相対評価であり、
◎；比較例１よりも大変優れている。
○；比較例１よりも優れている。
△；比較例１と略同等である。
×；比較例１よりも劣っている。

Evaluation is relative evaluation with comparative example 1, ie, the sheet for wiping which consists of the conventional nonwoven fabric,
A: Very superior to Comparative Example 1.
○: Superior to Comparative Example 1.
Δ: Substantially equivalent to Comparative Example 1.
X: Inferior to Comparative Example 1.

As described above, according to the paper wiping sheet according to the present invention, since pulp is used as the base material sheet, it can be manufactured at a lower cost than those using a nonwoven fabric.
Moreover, since resin is apply | coated to the surface and / or the back surface, compared with the case of only a base material sheet, washing durability improves.

  In addition, since the base sheet is formed by laminating a plurality of pulp layers, moisture can be held between the pulp layers, and moisture absorption performance can be improved.

  Moreover, since the base material sheet is laminated, the adhesion between the layers can be maintained, and the area of the surface layer can be increased to further improve the water absorbability.

  Further, since the resin is an acrylic resin, the surface layer can be protected and the washing durability can be improved.

  In addition, since the lamination process is performed after the resin is applied to the base sheet, the resin is uniformly applied to the surface of the base sheet as compared with the case where the lamination process is performed before the resin is applied. Can stabilize the quality.

Claims (5)

  A paper wiping sheet, wherein a resin is applied to a front surface and / or a back surface of a base material sheet made of pulp. In the paper wiping sheet according to claim 1,
The base sheet is a paper wiping sheet characterized in that a plurality of pulp layers are laminated. In the paper wiping sheet according to claim 2,
A paper wiping sheet, wherein the base material sheet is laminated. In the paper wiping sheet according to any one of claims 1 to 3,
The paper wiping sheet, wherein the resin is a thermosetting resin. An application step of applying a resin to the front surface and / or back surface of the base sheet made of pulp;
A laminating process for laminating a base material sheet coated with resin;
A method for producing a paper wiping sheet, characterized by comprising: