JP2008253284A - Method of manufacturing wiper sheet and wiper sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing wiper sheet generating little paper powder while using used paper pulp as a material at a high blending ratio. <P>SOLUTION: Wet paper with a moisture rate of 5.8-6.8% is made by adding a dry paper strength enhancing agent at a rate of 10.0-25.0 kg/t and a wet paper strength enhancing agent at a rate of 15-25 kg/t to the raw material pulp with used pulp blended at a blending ratio of 90-100%, and the wet paper is dried and crept in such a way that the extension rate is 17.0-25.0% in drying the wet paper to obtain the wiper. In this case, the blending ratio of the used pulp is the mass ratio of the used pulp to the total mass of the raw material pulp; the amount of the dry paper strength enhancing agent and the wet paper strength enhancing agent to be added is the mass per 1t of a suspension of the raw material pulp suspended with water; and the extension rate is computed by formula, "((length in the extended state-length in the contracted state)/length in the contracted state) ×100". <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a wiping paper used for wiping dust, moisture, and the like, and a wiping paper.

Currently, in research / inspection facilities and precision instrument handling facilities, so-called wipers are used to wipe off dust adhering to test tubes, laboratory equipment, electronic parts, etc., and water after washing. Has been. This wiping paper is problematic when paper dust adheres to a test tube or the like after the wiping operation, and is therefore required to have high wear strength and little paper dust generation.
On the other hand, in recent years, from the viewpoint of effective use of resources, waste paper pulp has been used as a raw material pulp in general paper products such as printing paper, postcards, and business cards. However, because waste paper pulp is being beaten, the fibers are shorter than virgin pulp and contain many fine fibers. Therefore, the current situation is that waste paper pulp is not used at least in a high blend as a raw material pulp for wiping paper in which generation of paper dust is particularly problematic. Rather, for example, a nonwoven fabric is bonded to a pulp-containing sheet (for example, see Patent Document 1), or such a nonwoven fabric is particularly limited to a meltblown nonwoven fabric (for example, see Patent Literature 2), or such nonwoven fabric is particularly made of lyocell fiber. Limited to spunlace nonwoven fabric obtained by hydroentanglement (see, for example, Patent Document 3), such as using non-woven cloth as a raw material, or searching for a suitable one as this non-woven cloth, only recycled paper pulp as a raw material However, the use of virgin pulp is also reduced.
JP 2001-314360 A JP 2002-88660 A JP 2005-143523 A

  SUMMARY OF THE INVENTION The main problem to be solved by the present invention is to provide a wiping paper manufacturing method and wiping paper in which waste paper pulp is used as a raw material with a high blending ratio, while generating less paper dust.

The present invention that has solved this problem is as follows.
[Invention of Claim 1]
Paper pulp is made by adding 10.0 to 25.0 kg / t of dry paper strength enhancer and 15 to 25 kg / t of wet paper strength enhancer to raw pulp with a blending ratio of waste paper pulp of 90 to 100%, and moisture content 5.8 to 6.8% wet paper is obtained, and when this wet paper is dried, creping is performed so that the elongation percentage is 17.0 to 25.0% to obtain a wiping paper. A method for manufacturing wiping paper.
Here, the mixing ratio of the waste paper pulp is a mass ratio with respect to the total amount of the raw material pulp, and the added amount of the dry paper strength enhancer and the wet paper strength enhancer is a 1 t suspension of the raw pulp suspended in water. The elongation percentage is “((length in the stretched state−length in the shrunken state) / length in the shrunken state) × 100”.

[Invention of Claim 2]
90-100% of raw pulp is waste paper pulp,
In papermaking of the raw pulp, a dry paper strength enhancer of 10.0 to 25.0 kg / t and a wet paper strength enhancer of 15 to 25 kg / t are added, and a moisture content of 5.8 to 6.8% depends on the papermaking. A wiping paper, wherein the wet paper is creped so as to have an elongation of 17.0 to 25.0% when the wet paper is dried.
Here, the mixing ratio of the waste paper pulp is a mass ratio with respect to the total amount of the raw material pulp, and the addition amount of the dry paper strength enhancer and the wet paper strength enhancer is a 1 t suspension of the raw pulp suspended in water. The elongation percentage is “((length in the stretched state−length in the shrunken state) / length in the shrunken state) × 100”.

  According to the present invention, a waste paper pulp is used as a raw material with a high blending ratio, and a wiping paper manufacturing method and a wiping paper with less generation of paper dust are obtained.

Next, an embodiment of the present invention will be described.
In the manufacturing method of the wiping paper of this embodiment, 90 to 100%, preferably 100%, of used paper pulp is used as the raw material pulp. The feature of this embodiment is that there is less generation of paper powder while used paper pulp is used in a high blending ratio, and the greater the blending ratio of the used paper pulp, the more superior the present invention is. Therefore, the advantage of the present invention is most exhibited when the waste paper pulp is 100%. In addition, the mixture ratio of waste paper pulp is a mass ratio with respect to the raw material pulp whole quantity.

  In this embodiment, the type of used paper used as a raw material for the used paper pulp is not particularly limited, and can be appropriately selected from newspaper used paper, magazine used paper, book used paper, unsorted used paper, and the like. Moreover, the method of manufacturing waste paper pulp from waste paper is not specifically limited, For example, waste paper pulp can be obtained through well-known processes, such as disaggregation and deinking.

  However, in this embodiment, the waste paper is used as a raw material, the Canadian standard freeness (JIS P 8121: 1995) is 250 to 350 ml, preferably 250 to 300 ml, and the fiber length is 0.1 to 1.1 mm, preferably Is preferably used waste paper pulp which has been disaggregated and deinked so as to have a thickness of 0.8 to 1.1 mm. This is because if such waste paper pulp is used, it becomes a wiping paper which is rich in flexibility, bulky and strong.

  On the other hand, when pulp other than waste paper pulp is used as the raw material pulp, the type of the pulp is not particularly limited. Examples of pulp other than waste paper pulp include hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), softwood unbleached kraft pulp (NUKP), hardwood sulfite pulp, and coniferous sulfite. Kraft pulp chemically treated with pulp containing wood fibers such as pulp as the main raw material, ground pulp obtained by mechanical pulping of chips, and chemical pulping by adding chemicals to wood or chips Virgin pulp such as semi-chemical pulp, which is pulped with refiner or the like after digesting ground pulp or chips until soft, can be used, preferably milk carton regenerated pulp, milk pack regenerated pulp or the like.

  Next, the raw material pulp containing waste paper pulp is made using a known paper machine such as a short net paper machine or a round net paper machine. This papermaking can be performed basically in the same manner as a known papermaking method. However, this papermaking has a dry paper strength enhancer of 10.0 to 25.0 kg / t, preferably 15.0 to 20.0 kg / t, and a wet paper strength enhancer of 15 to 25 kg / t, Preferably, 20.0 to 25.0 kg / t is added (addition ratio of dry paper strength enhancer to wet paper strength enhancer is 1: 1.25 to 1.5). When the added amount of the dry paper strength enhancer is less than 10.0 kg / t, the surface strength of the paper surface is lowered, and there is a possibility that the fibers may fall off when rubbed off by wiping or rubbing. On the other hand, when the added amount of the dry paper strength enhancer exceeds 25.0 kg / t, stains adhere to the paper due to an excessive increase in the concentration of white water. Further, when the addition amount of the wet paper strength enhancer is less than 15 kg / t, the wet paper strength is insufficient, and when water adheres, the tear easily breaks and the function as a wiping paper is not satisfied. On the other hand, when the addition amount of the wet paper strength enhancer exceeds 25 kg / t, stains adhere to the paper making tool and the paper due to an excessive increase in concentration in the white water system. In addition, the addition amount of a dry paper strength enhancer and a wet paper strength enhancer is the mass per 1t of suspensions which suspended the raw material pulp with water.

  In the present embodiment, the kind of the dry paper strength enhancer is not particularly limited. For example, polyacrylamide (PAM) such as acrylamide-vinyl monomer copolymer, anionic polyacrylamide, polyamide / epichlorohydrin, starch Examples thereof include starch such as oxidized starch and carboxymethylated starch, and polyvinyl alcohol. However, among these, it is preferable to use cationic polyacrylamide.

  On the other hand, in the present embodiment, the kind of wet paper strength enhancer is not particularly limited. For example, urea formaldehyde resin, melamine formaldehyde resin, polyamide resin, polyamide / epichlorohydrin resin, polyamide / polyamine / epichlorohydrin resin, polyamide / Examples include epoxy resins and epoxy-modified polyamides. However, among these, it is preferable to use a polyamide / epichlorohydrin resin.

  In this embodiment, when making paper, in addition to a dry paper strength enhancer and a wet paper strength enhancer, for example, a sizing agent that imparts water resistance, a dye or pigment that adjusts the color tone of paper, a sizing agent, a dye, a pigment, paper A sulfuric acid band or the like for fixing a force enhancer or the like to the raw material pulp can be added.

  In this embodiment, wet paper is obtained by the above paper making, as in the case of the known paper making method. However, the above papermaking is performed so that the wet paper has a moisture content of 5.8 to 6.8%, preferably 6.0 to 6.3%. If the moisture content of the wet paper is less than 5.8%, the amount of paper wrinkles generated from the cut surface tends to increase during slitting. On the other hand, when the moisture content of the wet paper exceeds 6.8%, the paper thickness is insufficient, and the bulk when several sheets are stacked is insufficient, leading to a decrease in volume and absorbability.

  Next, the wet paper is appropriately subjected to a known treatment, and then dried using a known dryer such as a Yankee dryer or a dryer combining several Yankee dryers with a Yankee dryer. In this drying, creping is performed so that the elongation is 17.0 to 25.0%, preferably 18.0 to 25.0%. If the elongation is less than 17.0%, tearing, tearing, etc. occur in ply processing and embossing excluding slitting after paper making, and the processing efficiency is lowered. On the other hand, if the elongation rate exceeds 25.0%, the processability may be significantly reduced due to paper squeezing or wrinkling in the process after papermaking. The elongation rate is “((length in the stretched state−length in the shrunken state) / length in the shrunken state) × 100”.

  The specific method for performing the above creping is not particularly limited. For example, if a Yankee dryer is used as the dryer, it can be applied using a blade for peeling the paper from the dryer roll surface. In this case, the elongation percentage can be adjusted, for example, by adjusting the angle of the blade, the thickness of the blade, sticking / adhering to the dryer, and the like.

  After performing the drying process as described above, the wiping paper of this embodiment can be obtained by performing a known process such as a calendar process if necessary. However, when improving the water absorption performance, the tensile strength of the paper, or improving the wiping performance, two, three, four or more sheets obtained by the above drying are used. It is preferable to superimpose and emboss to form a laminated structure. At this time, the embossing pressure of embossing is not particularly limited, but is usually 1.0 to 5.0 kg / cm, preferably 1.0 to 1.5 kg / cm. If the embossing pressure is less than 1.0 kg / cm, ply peeling tends to occur. On the other hand, when the embossing pressure exceeds 5.0 kg / cm, fiber breakage occurs, leading to strength reduction, fiber dropping, and paper dust generation.

Next, examples of the present invention will be described.
First, a wet paper was obtained by appropriately adding a dry paper strength enhancer and a wet paper strength enhancer to the raw pulp and making paper. The wet paper was dried with a Yankee dryer. During this drying, creping was performed. Then, four sheets of this creped paper were superposed (4 plies) and embossed to obtain a sample. Each sample was evaluated for abrasion resistance, paper dust and ply separation. Production conditions and results are shown in Table 1. The details described in the table are as follows.
[Blade angle]
This is the blade edge angle of the blade tip with respect to the dryer roll surface.
[NBKP]
Coniferous bleached kraft pulp. The mixing ratio is mass%.
[MDIP]
Magazine waste paper pulp. The mixing ratio is mass%.
[Freeness]
It is a Canadian standard freeness measured based on JIS P 8121: 1995.
[Dry paper strength enhancer]
As the dry paper strength enhancer, Harmide DN-420 cationic polyacrylamide manufactured by Harima Chemical Co., Ltd. was used.
[Wet paper strength enhancer]
As a wet paper strength enhancer, WS4024 polyamide / epichlorohydrin resin manufactured by Seiko PMC Co., Ltd. was used.
[Crepe rate]
The numerical value obtained by dividing the speed difference between the dryer and the reel by the reel speed is displayed as a percentage.
[Basis weight]
It is a value measured based on JIS P 8124: 1998.
[Paper thickness]
It is a value measured by a peacock manufactured by Ozaki Seisakusho.
[Dry paper strength]
It is a value measured based on JIS P 8113: 2006.
〔Growth rate〕
((Length of stretched state−Length of shrunken state) / Length of shrunken state) × 100.
[Wet paper strength]
It is a value measured based on JIS P 8135: 1998.
〔Moisture percentage〕
It is ((water mass / wet paper mass) × 100) of the wet paper.
[Abrasion resistance]
It is a value measured based on JIS P 8136: 1994.
[Paper dust]
After dividing 50 sets of samples into 10 sets, first, 10 sets of samples were put in a nylon bag, and the end of this bag was held and 20 times of sprinkling paper powder was dropped. Then, the other side of the nylon bag was held and the sprinkling powder was dropped 20 times in the same manner. This operation was repeated, and after removing paper dust for all 50 sets of samples, the mass was measured. The value obtained by subtracting the mass of the nylon bag from this mass was taken as the paper powder amount.
[Ply away]
It is the presence or absence of ply separation when embossing and bonding four sheets.

  INDUSTRIAL APPLICABILITY The present invention is applicable as a wiping paper manufacturing method and wiping paper used for wiping dust and moisture.

Claims (2)

Paper pulp is made by adding 10.0 to 25.0 kg / t of dry paper strength enhancer and 15 to 25 kg / t of wet paper strength enhancer to raw pulp with a blending ratio of waste paper pulp of 90 to 100%, and moisture content 5.8 to 6.8% wet paper is obtained, and when this wet paper is dried, creping is performed so that the elongation percentage is 17.0 to 25.0% to obtain a wiping paper. A method for manufacturing wiping paper.
Here, the mixing ratio of the waste paper pulp is a mass ratio with respect to the total amount of the raw material pulp, and the addition amount of the dry paper strength enhancer and the wet paper strength enhancer is a 1 t suspension of the raw pulp suspended in water. The elongation percentage is “((length in the stretched state−length in the shrunken state) / length in the shrunken state) × 100”. 90-100% of raw pulp is waste paper pulp.
When making the raw pulp, a dry paper strength enhancer of 10.0 to 25.0 kg / t and a wet paper strength enhancer of 15 to 25 kg / t are added, and the water content of the paper pulp is 5.8 to 6.8%. A wiping paper, wherein the wet paper is creped so as to have an elongation of 17.0 to 25.0% when the wet paper is dried.
Here, the mixing ratio of the waste paper pulp is a mass ratio with respect to the total amount of the raw material pulp, and the added amount of the dry paper strength enhancer and the wet paper strength enhancer is a 1 t suspension of the raw pulp suspended in water. The elongation percentage is “((length in the stretched state−length in the shrunken state) / length in the shrunken state) × 100”.