JPH06154123A - Water absorbing laminated paper and rolled towel of the same - Google Patents

Abstract

PURPOSE:To provide water absorbing laminated paper and a rolled towel of the same by which the used, and recovered paper is easily processed as a raw material of reclaimed paper. CONSTITUTION:A net 2 formed of polyvinyl alcohol resin beginning to dissolve into water at 30-100 deg.C of temperature and having 3-50% of the projected area ratio of large mesh is stuck between crepe paper sheets 1 having each 10-70g/m<2> of basic weight, a water absorbing property and water disaggregating property through adhesives 3. The crepe paper 1 is a laminated water absorbing paper consisting of two or three sheets as a whole. When the adhesives 3 is water- insoluble or water-soluble, the adhesives 3 are nearly uniformly applied to the net 2 within 30-50% or 30-100% of projected area ratio and in the case of a rolled paper towel, the crepe paper 1 is one having 20-70g/m<2> of basic weight and consisting of two sheets. Thus, the net 2 acting as a reinforcing material acts also effectively as a paper strength intensifying agent for vegetable fibers in dissolving used paper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an adhesive agent between crepe papers having water absorbability and water disintegration property, which makes it easy to treat recycled papers using plant fibers of crepe papers as raw materials for recycled papers when recovered as used papers. Laminated water-absorbent paper consisting of two or three sheets of crepe paper formed by pasting together a rough net as a reinforcing material, and the crepe paper specified in this laminated water-absorbent paper was wound into a roll. The present invention relates to rolled paper towels.

[0002]

2. Description of the Related Art Generally, paper is used for various purposes because it has excellent properties such as water absorbency, softness, and ease of processing. As an example, there is a wiping cloth, a paper towel, or the like as a paper product that utilizes the water absorption property of pulp. However, since paper products generally have low strength, particularly low wet strength, a wet paper strengthening agent is used to improve the strength or a binder is coated on the surface of the paper, but the rate of increase in strength obtained is at most. It is about 20 to 50%. Further, when the amount of the wet paper strength enhancer or the amount of the binder applied to the surface is increased, not only the water absorption is lowered but also the water disintegration property is remarkably lowered, which makes it difficult to treat the waste paper.

Therefore, as a method for further increasing the strength of paper,
As a high-strength material, for example, a method of laminating and adhering between papers using a film or a net having a hole such as polyolefin or polyester as a reinforcing material is adopted. Since this method maintains water absorbency and has high strength, it is used as a cloth for wiping as a cloth substitute, a base cloth for wet tissues, and the like. However, even if paper with such a non-water-soluble reinforcing material laminated and adhered is recovered as waste paper, it is difficult to separate and decompose the reinforcing material portion with conventional equipment, and it is actually discarded or incinerated without being recycled. Is the current situation.
This is because the reinforcing material is wrapped around the impeller or shaft of the pulper for disaggregation during disaggregation, or the plant fibers that make up the paper hug the reinforcing material and form a dango-like phenomenon that prevents fiber separation. This is because the operability and the recovery rate of plant fibers are significantly reduced.

Further, there is a recycle type cloth roll towel as a conventional towel. This recyclable cloth roll towel is used to continuously unwind the used web and wind up the used web in the cabinet. The used web is washed and disinfected for repeated use. Therefore, not only is it necessary to use chemicals for washing and disinfection and labor, but there is a drawback in that if a damaged portion is formed in the middle, it cannot be reused.

[0005]

DISCLOSURE OF THE INVENTION The present invention eliminates the drawbacks of the prior art and devises a material for a reinforcing material in a laminated absorbent paper utilizing the water absorption property of pulp used for wiping waste, paper towels, etc., It is constructed so that it can be easily disaggregated with conventional waste paper processing equipment and that plant fiber can be easily recovered as a raw material for recycled paper, and one of the laminated water-absorbent papers with suitable properties is wound into a roll. And a roll-shaped paper towel.

[0006]

As a result of intensive studies to solve the above problems, the present inventors have found that the basis weight of one sheet is 10 to 70 g.
/ M ² water absorbing and water disintegrating crepe paper through an adhesive, a filamentous material made of a polyvinyl alcohol resin having a temperature of starting to dissolve in water of 30 to 100 ° C. formed into a lattice shape in the longitudinal and transverse directions. Woven or superposed to form a rough net having a projected area ratio of 3 to 50%, wherein the crepe paper is composed of two or three sheets in total, and the adhesive is non-water-soluble. In the range of 30 to 50% of the projected area of the net, and in the case of water-soluble, 30 to 100 of the projected area of the net.
%, The laminated water-absorbent paper coated almost evenly is preferable due to its characteristics, and when this laminated water-absorbent paper is used as a paper towel that is used continuously, the basis weight of one crepe paper is used. Is 20 to 70 g / m ² , and
The present invention has been completed by discovering that a laminated water absorbent paper having two crepe papers wound in a roll shape is suitable.

Hereinafter, the laminated water-absorbent paper and the roll-shaped paper towel according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view illustrating the structure of one embodiment of the laminated water absorbent paper according to the present invention, FIG. 2 is a perspective view illustrating the structure of another embodiment of the laminated water absorbent paper according to the present invention, and FIG. 3 is the present invention. It is a perspective view explaining the structure of 1 Example of the roll-shaped paper towel which concerns on. In the drawing, 1 indicates a basis weight of 10 to 70 g / m.
A crepe paper having water absorbency and water disintegration property of ² . The crepe paper 1 may contain chemicals such as a paper strengthening agent, fillers, etc., if necessary, but the fiber component is composed of vegetable fibers (which may include recycled fibers such as rayon). It is creped (wrinkled) so that the crepe rate is 10% or more (usually in the range of 10 to 50%), has water absorbency, and has the property of being easily disintegrated into water by mechanical treatment or the like. It is a thing.

Here, "having water absorption" means JIS-
S3104 "Tissue paper" standard water absorption test, that is, using a pipette adjusted so that one drop dropped to about 0.1 ml, a diameter of 4
Test piece on a support with a hole of 0 mm or more (one set of two layers)
Place a drop of distilled water at a temperature of 20 ± 1 ° C from a height of about 10 mm, and the time from when the drop of water contacts the test piece until it is completely absorbed and the reflected light disappears for 0.1 seconds. The test measured in units is performed 5 times, and the value indicated by the average value in the test method is 8 seconds or less. Further, "having water disintegrating property" means that 60 g of a test piece cut into a square of 2 cm is immersed in 2 liters of disintegrating liquid and then TAPP
I The defibrated state after defibrating treatment for 20 minutes with a standard defibrating machine is visually judged using handmade paper, and 80% or more of the fibers are dispersed and the degree of defibration is 8 or more. As the disintegration liquid used in this disintegration treatment, room temperature water is used when the crepe paper 1 does not contain a wet strength agent, and a high degree bleaching powder is effective chlorine equivalent to 0.72 when the wet strength agent is included. %% shall be used.

The crepe rate is the ratio of the speed difference between the dryer section and the reel section to the dryer section speed in the process of winding the web onto the reel while peeling the web from the dry dryer with a doctor blade and applying a crepe (crease). %) And is represented by the following equation.

No. 2 has a temperature at which it begins to dissolve in water from 30 to 100 ° C.
Is a coarse net having a projected area ratio of 3 to 50%, which is formed by weaving or overlapping filaments made of the polyvinyl alcohol resin in a matrix shape in the longitudinal and transverse directions. The net 2 is the crepe. The laminated water-absorbent paper according to the present invention is formed by bonding the paper 1 with the adhesive 3 to be described later to serve as a reinforcing material. The strength of the net 2 is the strength of the filaments alone and the density of the filaments (number / c
m), it is suitable for the strength of the filamentous material depending on the use of the laminated water-absorbent paper according to the present invention.
The thickness and the density of the filamentous material may be selected to form a net, and the filamentous material is a generic term for flat yarn, spun yarn and filament yarn.

This net 2 has a temperature of 30 at which it begins to dissolve in water.
Since it is made of polyvinyl alcohol resin of up to 100 ° C, it begins to dissolve in water above the temperature at which it begins to dissolve in water (water dissolution temperature) and easily softens and dissolves with the passage of time and temperature, resulting in a shape and strength It will be lost at all. The water dissolution temperature must be 30 to 100 ° C.
When the laminated water-absorbent paper according to the present invention is used for applications that often get wet with water at room temperature, such as a cloth for wiping clothes and paper towels, it is softened and dissolved immediately when it gets wet with water at room temperature, so its intended use is Since the water melting temperature will be limited, the lower limit of the water dissolution temperature is set to 30 ° C, and when waste paper is processed, water is dissociated in the water heated in the pot open to the atmosphere, so at that maximum temperature This is because if the water dissolution temperature exceeds a certain temperature of 100 ° C, it cannot be processed by ordinary waste paper processing equipment, but the water dissolution temperature is 50-
A temperature of 70 ° C. is preferable because it has no harmful effect in normal use and it is easy to obtain hot water in this range even with waste paper processing equipment.

The water dissolution temperature varies depending on the saponification degree, the copolymerization degree, the modification degree, etc. of the raw material polyvinyl alcohol resin, and the heat treatment in the spinning step of the filamentous material. The strength of the filamentous material can be freely changed by the degree of polymerization of the spinning raw material, the stretching treatment at the time of spinning, and by twisting the fiber obtained by spinning. For example, a polyvinyl alcohol resin having a degree of polymerization of 1700 and a degree of saponification of 98.0 mol% is modified with a carboxylic acid (acrylic acid or maleic acid) to have a carboxyl group content of 3 mol%, which is dry-spun.
When heat-treated in the range of 0-200 ° C, the water dissolution temperature is 30-3
A polyvinyl alcohol-based resin flat yarn or fiber at 5 ° C. is obtained. As an example of the net 2, the above-mentioned spun filament yarn or fiber is stretched 3 to 6 times,
If it is a fiber, it is made into a filament yarn or spun yarn of 50 to 70 count, and if it is a flat yarn, it is made into a yarn form having a thickness of 30 to 60 μm and a width of 1.5 to 3 mm, and a filamentous material density is 0.5 to 2
A plain weave with a book / cm in a lattice shape is preferably used.

Reference numeral 3 denotes an adhesive for bonding the rough net 2 between the crepe papers 1. As the adhesive 3, both non-water-soluble one and water-soluble one can be used. However, when the adhesive 3 is a non-water-soluble adhesive composed of a thermoplastic resin having a melting point lower than that of the net 2 (usually about 220 to 240 ° C.), such as ethylene vinyl acetate or polyvinyl chloride. It is necessary that the coating is applied almost uniformly within the range of 30 to 50% of the projected area of the net 2. This is because when such a non-water-soluble adhesive 3 is applied to the net 2 in an amount exceeding 50% of the projected area of the net 2, the laminated water-absorbent paper is collected and the water is stored in the pot of the used paper processing facility. This is because the adhesive 3 blocks the contact of water with the net 2 even if it is attempted to be disintegrated, and the dissolving ability of the net 2 is reduced. In addition, the non-water soluble adhesive 3 is a net 2
If less than 30% of the projected area of the net 2 is applied to the net 2, the adhesive force of the net 2 to the crepe paper 1 will be insufficient and the laminated water absorbent paper reinforced by the net 2 will not be obtained. When the adhesive 3 is non-water soluble,
The net 2 made of a polyvinyl alcohol-based resin loses its shape and strength by swelling and dissolving by contacting with water first in a portion where the adhesive 3 is not applied in water having a water melting temperature or higher. Remains as a solid, but since it is a minute amount compared to the whole laminated water-absorbent paper, it can be easily removed by a screen of a used paper processing facility.

When the adhesive 3 is a water-soluble adhesive such as a starch-based resin, a carboxymethylcellulose-based resin, or a polyvinyl alcohol-based resin, it is almost even within the range of 30 to 100% of the projected area of the net 2. It only needs to be coated. If the adhesive 3 is water-soluble,
If you put the laminated water-absorbent paper in the pot of the waste paper processing equipment, the adhesive 3
Is easily dissolved and does not hinder the dissolution of the net 2. Therefore, there is no problem even if the adhesive 3 is applied to the entire projected area of the net 2, but the adhesive 3 does not affect the projected area of the net 2. This is because if less than 30% is applied to the net 2, the adhesive force of the net 2 to the crepe paper 1 will be insufficient and the laminated water absorbent paper reinforced by the net 2 will not be obtained.

Adhesive 3 between crepe paper 1 as described above
In the laminated water-absorbent paper in which the rough net 2 is attached via the sheet, the basis weight of one crepe paper is 20 to 70 g /
For example, if the number of crepe sheets is ² and the m ² is 30 to 1,
The roll wound to a length of 00 m can be immediately used as a roll-shaped paper towel.

When a laminated water-absorbent paper is used as the roll-shaped paper towel, the roll-shaped paper towel is used as a substitute for a recycled cloth towel provided in a hand-washing place such as a toilet or a washroom, so that the roll-type paper towel can be used for many purposes. Since it is the wiping off of water after washing arms, face, etc., a water absorption amount of 200 g or more per square meter is desired. However, the amount of water absorption is proportional to the weight of the plant fiber that is the raw material of the paper, and the basis weight of the crepe paper 1 is the case where the crepe paper 1 is two sheets (the net 2 is sandwiched between the crepe paper 1 and the crepe paper 1). Is required to be 40 g / m ² or more in total, so that the basis weight of one crepe paper 1 is 20 to 70 g / m ^2.
It must be ² . However, if the basis weight of the paper is too high, the paper becomes hard and the wiping comfort becomes poor. Therefore, it is desirable that the basis weight of one crepe paper 1 be 30 to 40.
It is preferably 60 to 80 / m ² in total in g / m ² . In order to secure the softness as a roll-shaped paper towel, the crepe paper 1 creped to a crepe ratio of 10 to 50% is suitable.

[0017]

In the laminated water-absorbent paper in which the rough net 2 made of polyvinyl alcohol resin is bonded to the crepe paper 1 via the adhesive 3 as described above, the crepe paper 1 has water absorbency. Therefore, the crepe paper 1 can be effectively used for applications requiring water absorption such as a wiping waste and a paper towel, and the crepe paper 1 has a basis weight of 10 to 10.
Since the net 2 made of polyvinyl alcohol resin is bonded as a reinforcing material between the crepe papers 1 with a comparatively thin thickness of 70 g / m ² via an adhesive 3, such water absorption is required. Therefore, the crepe paper 1 that exhibits water absorbency even when used for the following applications does not come apart or get scratched. The total number of crepe papers 1 to be used is 2 to 3, so that the crepe paper 1 is not bulky.

When the net 2 as a reinforcing material is made of a polyvinyl alcohol resin having a temperature of 30 to 100 ° C. when it is recovered after being used and put into a used paper processing facility, the net 2 as a reinforcing material is made of crepe paper 1. Even if the adhesive 3 adhered to is non-water-soluble, the net 2 is applied only in the range of 30 to 50% of the projected area of the net 2, so the net 2 is softened and melted at a temperature higher than the water-melting temperature. The crepe paper 1 loses its shape and strength and can be easily understood by the conventional waste paper processing equipment, and the plant fiber of the crepe paper 1 can be recovered as a raw material for recycled paper.

At this time, the net 2 which has been disintegrated or dissolved together with the crepe paper 1 becomes a part of the pulp suspension as a water-soluble polymer and is recovered together with the pulper white water or the plant fiber and recycled paper. When used as, it has an effect as a paper-strengthening agent on plant fibers and therefore acts very effectively.

Further, since this roll-shaped paper towel is a substitute for the conventional recycled cloth towel, it is necessary to have strength that can be held and pulled by a wet hand, and the vertical and horizontal wet tensile strengths are required. JIS-S3104
A value of at least 0.5 kg / 25 mm is required as a value in the tensile strength test method of the "tissue paper" standard, which can be satisfied by using the crepe paper 1 and the net 2 described above. And since this towel is continuously wound up and collected in the cabinet after use, it has excellent recovery efficiency as used paper and is easy to process used paper, so it can be recycled (recycled) into various papers as a used paper raw material. is there.

[0021]

【Example】

Example 1 Containing 50% of softwood fibers and 50% of hardwood fibers, Kamen 55 manufactured by Hercules Co., Ltd. as a wet paper strength enhancer
The weight of one sheet containing 0.2% of 7H is 20g.
/ M ² between crepe paper with water dissolution temperature of 40 ℃ and thickness of 6
Polyvinyl alcohol-based synthetic fiber yarn with No. 0 count is used for each length and width
The projected area ratio of woven in a lattice with a yarn density of 8 threads / cm is 8.
Laminated water-absorbent paper was manufactured by heat-bonding a 0% rough net with an adhesive composed of ethylene vinyl acetate coated approximately uniformly at a ratio of 50% of the projected area of the net.

Example 2 Laminated water absorption under exactly the same conditions as in Example 1 except that the basis weight of the crepe paper was 35 g / m ² and that a net made by Kurabo Industries with a water dissolution temperature of 60 ° C. was used. Paper was manufactured.

Comparative Example 1 A tissue paper similar to the conventionally used tissue paper was prepared in which two sheets of the same crepe paper as those used in Example 1 were simply overlaid.

Comparative Example 2 Between the same crepe papers used in Example 1,
A laminated water-absorbent paper was produced by heating and bonding a polyester net of KPM # 4220 / F12 (basis weight: 15 g / m ² ) manufactured by Bay Mills Co., which was previously coated with an adhesive composed of ethylene vinyl acetate.

Strength and Disaggregation Degree Experimental Results Each product of the above-mentioned Examples and Comparative Examples was 2 cm × 2 c.
Cut into m pieces, and use a TAPPI standard disintegrator for 25 liters each of which corresponds to 60 g of sheet sample (3% concentration) for 2 liters of water
A disaggregation test was performed at temperatures of 45 ° C, 45 ° C, and 65 ° C, and about 20 g / m ² of handmade paper was made from the pulp slurry after disaggregation, and the disaggregated state was judged from the appearance according to the following criteria of 0 to 10. 0 ... Completely disintegrated 5 ... 50% of the total disaggregated or dissolved without leaving the original 10 ... Completely disaggregated or dissolved The results are shown in Table 1.

[0026]

[Table 1] * The adhesive consisting of ethylene vinyl acetate remains,
The fibers adhering to this adhesive remained very slightly, but the evaluation of this part was excluded from the evaluation after disaggregation.

[0027]

INDUSTRIAL APPLICABILITY As described in detail above, the laminated water-absorbent paper according to the present invention can be used for the products of the departments requiring water absorption, which conventionally used cloths or non-woven cloths for wiping or towels. , After use, it can be recovered and used as a raw material for recycled paper by treating it with existing waste paper processing equipment. At this time, the net stuck between the crepe paper as a reinforcing material is dissolved and plant fiber Since it has an effect as a paper strengthening agent, it acts very effectively. Further, in this laminated water-absorbent paper, the basis weight of the crepe paper is further restricted and the number of crepe papers used is limited to two, and the rolled paper towel according to the present invention is a conventional disposable type towel. Similar to paper towels, it can be used as a substitute for a recycled cloth roll towel that is rolled out and collected after use when used, and by using a dedicated cabinet, it can be efficiently collected after use and can be reliably used as waste paper. is there. As described above, the laminated water-absorbent paper and the roll-shaped paper towel according to the invention are not only economically contributed by facilitating the treatment of used paper after use and improving the recovery rate, but are also environmentally friendly by avoiding disposal or incineration. It is a great contribution.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a structure of an embodiment of a laminated water-absorbent paper according to the present invention.

FIG. 2 is a perspective view illustrating the structure of another embodiment of the laminated water absorbent paper according to the present invention.

FIG. 3 is a perspective view illustrating the structure of one embodiment of a roll-shaped paper towel according to the present invention.

[Explanation of symbols]

 1 Crepe paper 2 Rough net 3 Adhesive

Claims (4)

[Claims] 1. An adhesive (3) between crepe papers (1) having a water absorption and a water disintegrating property of a basis weight of 10 to 70 g / m ^2.
And a projected area ratio of 3 to 50, which is made of polyvinyl alcohol resin having a temperature of 30 to 100 ° C.
% Of rough nets (2) are laminated together, the crepe paper (1) is a laminated water absorbent paper consisting of two or three sheets in total, and the adhesive (3) is non-water-soluble. In some cases, it is in the range of 30 to 50% of the projected area of the net (2), and when the adhesive (3) is water-soluble, the net is
(2) A laminated water-absorbent paper, which is coated approximately evenly in the range of 30 to 100% of the projected area. 2. The laminated water absorbent paper according to claim 1, wherein the crepe paper (1) is a crepe paper having a crepe ratio of 10 to 50%. 3. A crepe paper (1) having a basis weight of 20 to 7
A roll-shaped paper towel, characterized in that the laminated water-absorbent paper according to claim 1 is 0 g / m ² and the number of the crepe paper (1) is two. 4. The rolled paper towel according to claim 3, wherein the crepe paper (1) is a crepe paper having a crepe ratio of 10 to 50%.