JPH0985870A - Wiping cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiping cloth that compression collapse in the thickness direction of a sheet scarcely occurs, even if it is compressed and squeezed in a wet state, and has a composite sheet including high bulk, excellent flexibility, water retention characteristics, water absorbing characteristics and washing resistance as the cloth and particularly remarkably excellent wiping properties. SOLUTION: The wiping cloth comprises a paper sheet made of pulp fiber laminated on one side surface of a spun bonded nonwoven fabric, a composite sheet formed by passing high-pressure water column flow from the surface side of the paper sheet toward the bonded nonwoven fabric side and confounding the pulp fiber and the long fiber of the nonwoven fabric to integrate them and impregnated with synthetic resin, wherein the paper sheet contains 5 to 75wt.% of pulp fiber containing 90wt.% or more of α-cellulose content.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wiping cloth having excellent wiping performance which can be repeatedly used for industrial wipers, waste cloths, counter cloths, wipes, rags and the like.

[0002]

2. Description of the Related Art Conventionally, as a wiping cloth that can be repeatedly used, cellulose pulp fibers are bulky accumulated, and then a water-soluble emulsion of a synthetic polymer resin is applied or impregnated as an adhesive to be contained and dried. Dry pulp sheets are used. However, although the dry-pulp sheet has good wiping-off property, the wet strength is weak because the cellulose pulp fibers used are short fibers, and it is used in a wet state by absorbing water or an aqueous solution containing a drug. It has the drawback of being easily torn during washing and washing. In order to improve this, it is necessary to contain a large amount of an adhesive composed of the polymer resin for reinforcement, but since it is composed of only short fibers, even if treated with such an adhesive. The strength is not sufficiently expressed. Further, if the content of the adhesive is large, water absorption and water retention, which are important characteristics as a wiping cloth, are lowered, and the softness is deteriorated.

On the other hand, after rayon fibers, which are hydrophilic fibers, are collected to form a web, a water column flow is applied to the web in order to entangle the rayon fibers with each other and to provide holes in the web for the purpose of improving wiping property. A method of applying (also called a high-pressure water jet entanglement method) is also known. However,
In order to provide the entanglement of fibers with each other and the formation of pores by the water column flow, a large amount of rayon fibers must be accumulated.
That is, in the web having a small amount of rayon fibers accumulated, a relatively large gap is formed between the rayon fibers, and even if a water column flow is applied, the water column flow passes without colliding with the rayon fibers, As a result, it is not possible to entangle the rayon fibers with each other by the water column flow and also to open the web.

As described above, in the case of a wiping cloth using rayon fibers, it is necessary to increase the amount of rayon fibers accumulated. However, when this is done, the wiping cloth becomes bulky with excess quality and inevitably the manufacturing cost. It has the drawback of being expensive. In addition, since rayon fiber has excellent hydrophilicity, it absorbs water well and swells, its rigidity is extremely lowered, and the fiber easily disentangles during washing. Therefore, a polymer resin for fixing the fibers to each other. It is necessary to use an adhesive consisting of, but when the amount of rayon fibers accumulated is large, the content of the adhesive also needs to be large. However, if the content of the adhesive is increased, the water retention of the wiping cloth is lowered, and the softness is deteriorated.

As a method for increasing the strength when wet, for example, in Japanese Patent Laid-Open No. 146716/1994, a paper sheet is laminated on a spunbonded nonwoven fabric made of continuous continuous hydrophobic fibers,
A high pressure water column flow is applied from the surface side of the paper sheet to form a composite sheet by confounding and integrating pulp fibers and long fibers of spunbonded nonwoven fabric, and then containing a predetermined amount of self-crosslinking resin,
A method of making a wipe by drying is disclosed. Since the wiping cloth composed of the composite sheet by this method is mainly composed of hydrophobic long fibers that are difficult to absorb water and maintains its shape, it has high wet strength and is easily torn when used in a wet state or washed. The drawbacks can be eliminated and the fall of pulp fibers during washing can be prevented.

However, in the wiping cloth made of the composite sheet obtained by the above-mentioned method, the pulp fiber and the spunbonded nonwoven fabric are entangled and integrated with each other by a high pressure water column flow to form a composite sheet, and then a squeezing step is provided from the viewpoint of drying efficiency. When the composite sheet is compressed and squeezed in a wet state, it swells with water and the softened pulp fiber is easily crushed,
The thickness of the composite sheet in the thickness direction is reduced. However, since this type of wiping cloth absorbs water by a capillary phenomenon, the sheet thickness becomes thin, and when the density of the composite sheet increases due to the compression operation called squeezing, there is an inherent disadvantage that the wiping property is greatly reduced. There is.

[0007]

SUMMARY OF THE INVENTION In view of the present situation, the present inventors have conducted diligent research to solve the above problems, and apply the spunbonded non-woven fabric onto the spunbonded nonwoven fabric when manufacturing a wiping cloth made of a composite sheet. A wiping cloth made of a composite sheet in which a specific amount of pulp fibers having a high α-cellulose content is contained in a paper sheet to be laminated is a composite cloth sheet having a resistance to the wiping cloth even when compressed and squeezed in a wet state when the composite sheet is prepared. When the above resin is contained for the purpose of improving the washability, it is possible to prevent the compression crushing in the thickness direction of the composite sheet even if a squeezing operation is performed in a wet state in order to adjust the amount of the resin. The inventors have found that the wiping performance can be remarkably improved while maintaining the above, and have completed the present invention. The object of the present invention is that even if an operation of compressing and squeezing in a wet state before containing a resin in a wiping cloth made of a composite sheet, compression collapse in the thickness direction of the sheet hardly occurs, and it is bulky and excellent as a wiping cloth. Another object of the present invention is to provide a wiping cloth made of a composite sheet which has excellent flexibility, water retention, water absorption and washing resistance and which is particularly excellent in wiping-off property.

[0008]

Means for Solving the Problems In the present invention, a resin composition of a thermoplastic polymer is melt-spun, a spun long fiber filament group is collected into a web, and the web is regularly and intermittently cut. On one side of the spunbonded non-woven fabric obtained by providing a typical self-bonding area, a paper sheet made of pulp fibers is laminated, and a high pressure water column flow is passed from the surface side of the paper sheet toward the spunbonded non-woven fabric side, In a wiping cloth obtained by intertwining fibers and long fibers of a non-woven fabric into a composite sheet and then containing a synthetic resin in the composite sheet, the paper sheet has pulp fibers having an α-cellulose content of 90% by weight or more. The cleaning cloth is characterized by containing 5 to 75% by weight.

In the present invention, first, a spunbonded non-woven fabric is prepared from a continuous fiber web in which continuous continuous fibers made of a hydrophobic thermoplastic resin are accumulated. For example, such a nonwoven fabric is melt-spun with a thermoplastic resin in a known extrusion spinning machine, and the spun continuous filament filament group is drawn by an ejector while being drawn with high-speed high-pressure air, opened, and captured. It is obtained by collecting on a support surface for collecting into a web, and subjecting this web to thermocompression bonding treatment. Examples of the long fibers include polyolefin long fibers, polyester long fibers, polyamide long fibers, polyacrylic acid ester long fibers, and the like.
It is appropriately selected from these and used.

In the present invention, the reason why the long fibers are used is that the long fiber web made of the long fibers is more entangled with each other than the short fiber web made of the short fibers when the fibers are entangled with each other. Because it is superior to. Furthermore, in the case of long fibers, even if a high pressure water column flow is applied, it is difficult for the fibers to flow out together with the water column flow. The fineness of the long fibers is 1 to 7 denier, preferably 1 to 4 denier. When the fineness of the long fibers exceeds 7 denier, the flexibility of the non-woven fabric is reduced, and the flexibility when used as a wiping fabric is also reduced, resulting in poor usability. On the other hand, when the fineness of the long fibers is less than 1 denier, the conditions for producing the long fibers become strict, and it becomes difficult to produce the long fibers and thus the long fiber web at a high speed.

The reason why hydrophobic and thermoplastic fibers are used as long fibers is that when hydrophobic long fibers are used, they absorb water and swell as compared with the case where hydrophilic long fibers are used. This is because it is difficult and the wet strength of the long fibers does not easily decrease. It is difficult for the wet strength of long fibers to decrease,
This is because the wiping cloth containing long fibers also has a low wet strength, and can prevent the drawback of being easily broken during use in a wet state or during washing. The basis weight of the spunbonded nonwoven fabric composed of the long fiber web is 5 to 30 g / m ² , and preferably 5 to 20 g / m ² . When the basis weight of the non-woven fabric exceeds 30 g / m ² , a paper sheet is formed even if a paper sheet made of pulp fiber is laminated on one side of the non-woven fabric and a high pressure water column flow is applied from the paper sheet side to the non-woven fabric side. It becomes difficult for the pulp fibers to move to the surface of the non-woven fabric that is not in contact with the paper sheet (the back surface of the laminated body), and the difference in water absorption in the thickness direction appears. On the contrary, when the basis weight of the nonwoven fabric is less than 5 g / m ² , the morphological stability of the nonwoven fabric is reduced and the wet strength of the obtained wiping fabric is reduced. Furthermore, when the gap between the long fibers becomes large and the high pressure water column flow is applied, the pulp fiber is washed away from the gap and is wasted. Is mixed in a large amount,
You will also be in trouble with that process.

The spunbonded non-woven fabric made of the long fiber web is fused with the long fibers in a scattered manner by heating. In the present invention, the reason why the spunbonded non-woven fabric is preferably used is that the non-woven fabric has a point fusion part in which long fibers are self-fused to each other, and thus has excellent morphological stability and a part other than the point fusion part. In (1), since the long fibers are not self-fused to each other and are accumulated in a free state, excellent flexibility is obtained and the fibers are easily entangled with each other.

On one surface of the spunbonded nonwoven fabric prepared as described above, a paper sheet made of pulp fibers containing 5 to 75% by weight of pulp fibers having an α-cellulose content of 90% by weight or more is laminated. Α used in the present invention
Pulp fiber having a cellulose content of 90% by weight or more is prepared by cooking a softwood material by a known kraft method, a sulfite method, a soda method, etc., and performing a known alkali refining treatment on the bleached pulp obtained by careful selection and bleaching. It is a pulp in which a trace amount of lignin and hemicellulose contained in pulp fibers are removed and the α-cellulose content is adjusted, and dissolving pulp and alkali mercerized pulp are particularly suitable. Bleached pulp is usually bleached by applying a known multi-stage bleaching sequence to the unbleached pulp by a combination of bleaching agents such as chlorine, alkali, hypochlorite, chlorine dioxide, etc., and lignin is removed during this treatment. Along with this, part of hemicellulose is also removed, but in order to make the α-cellulose content of 90% by weight or more, it is necessary to purify with an alkali to further remove hemicellulose from the obtained bleached pulp. .

As a method of alkali refining, for example, the bleached pulp is immersed in a dilute alkali solution such as caustic soda having a concentration of 0.5 to 3% by weight at 80 to 140 ° C.,
Method for adjusting α-cellulose content to 90 to 96% by weight, 3
There is a method of dipping at 20 to 40 ° C. in a strong alkaline solution such as caustic soda having a concentration of ˜25 wt% to make the α cellulose content of 96 to 100 wt%, but the α cellulose content used in the present invention is The pulp fiber having a content of 90% by weight or more has an α-cellulose content of 90% by weight or more, and the manufacturing method is not particularly limited. The α-cellulose content in the pulp fiber according to the present invention is determined according to JIS P 81
It is a value measured based on the method described in No. 01 (Test method for dissolving pulp), and is indicated by the ratio of the weight of cellulose insoluble in a 17.5 (mass)% sodium hydroxide solution to the weight of absolutely dry pulp fiber.

On the other hand, as a pulp having an α-cellulose content not adjusted, which is used by mixing with a pulp having an α-cellulose content of 90% by weight or more, softwood or hardwood is a known kraft method or sulfite method. , Soda method, unbleached pulp obtained by digesting with a polysulfide method, bleached pulp obtained by further bleaching if necessary, or groundwood pulp from the softwood, mechanical pulp such as thermomechanical pulp These pulps can be used alone or as a mixture. When the hardwood pulp is used together, the weight mixing ratio of the softwood pulp and the hardwood pulp is as follows: softwood pulp: hardwood pulp = 10
0: 0 to 20:80, preferably 100: 0 to 40: 6
It is in the range of 0. If the hardwood pulp exceeds 80% by weight of the total pulp amount, not only the amount of pulp lost when a high-pressure water column flow is applied, but also the flexibility of the composite sheet after entanglement decreases.

The above-mentioned paper sheet containing pulp fibers whose α-cellulose content is adjusted to 90% by weight or more is obtained by blending pulp fibers whose α-cellulose content is not adjusted with pulp fibers whose α-cellulose content is adjusted. It is obtained by making paper using a known wet paper machine using the mixed slurry prepared above, and further drying with a dryer. The paper sheet used in the present invention contains pulp fibers having an α-cellulose content of 90% by weight or more based on the total weight of pulp fibers in an amount of 5 to 75% by weight. When the content is less than 5% by weight, after the high pressure water column flow is applied, the composite sheet is squeezed in a wet state before the composite sheet is dried or when a synthetic polymer resin for imparting washing resistance is contained in the composite sheet. If so, the composite sheet is compressed and deformed in the thickness direction and is not restored, and the composite sheet is crushed in the thickness direction, resulting in high density. On the other hand, if the content exceeds 75% by weight, there is no problem in water absorbency and wiping-off property, but the formation collapses during papermaking, the strength of the paper sheet is reduced, and the compounding amount is increased in spite of the increased amount. The sheet thickness of the composite sheet cannot be improved, and a large amount of expensive pulp fiber is used, which increases the cost of the composite sheet and is not a good idea.

JIS of the paper sheet used in the present invention
The density according to P 8118 is 0.65 g / cm ³ or less. When the density of the paper sheet exceeds 0.65 g / cm ³ , when the paper sheet and the non-woven fabric are made into a laminate and a high pressure water column flow is applied from above the paper sheet, the movement of the pulp fiber is suppressed, The entanglement of long fibers and pulp fibers becomes insufficient, and the flexibility of the composite sheet after entanglement decreases. However, there is a limit in reducing the density of the paper sheet, and the lower limit is about 0.20 g / cm ³ in a soft state like tissue paper.

This paper sheet is laminated on one side of a spunbonded nonwoven fabric prepared in advance to form a laminate. At this time, the ratio of the basis weight of the spunbonded nonwoven fabric according to JIS P 8124 to the absolute dry basis weight of the paper sheet is , Spunbond nonwoven:
Adjust so that paper sheet = 1: 1 to 1:19. When the basis weight ratio of spunbonded non-woven fabric and paper sheet exceeds 1: 1 and the ratio of paper sheet decreases, the amount of pulp fibers becomes relatively small with respect to the amount of long fibers, resulting in water absorption of the wipe. Sex and flexibility are reduced. In addition, the amount of inexpensive pulp fibers is smaller than that of long fibers, which increases the manufacturing cost of the obtained wiping cloth itself, which is not suitable. vice versa,
When the basis weight ratio of spunbonded non-woven fabric: paper sheet exceeds 1:19 and the ratio of the paper sheet increases, it becomes difficult for all of the pulp fibers constituting the paper sheet to be entangled firmly with the long fibers. When the wiping cloth is moistened with water and used, the pulp fibers easily fall off, which is not suitable.

After the paper sheet is laminated on a spunbonded non-woven fabric to form a laminated body, a high-pressure water column flow is applied from the surface of the paper sheet toward the spunbonded non-woven fabric side. , For example, the diameter is 0.01-0.3m
High water pressure, for example 20 ~ 180k through m nozzle hole
It is obtained by ejecting water at a pressure of g / cm ² . When this high-pressure water column flow is applied to the laminate, the high-pressure water column flow first collides with the paper sheet to bring the paper sheet into close contact with the spunbonded nonwoven fabric, and then, in this close contact state, partial collapse of the paper sheet occurs. Then, the pulp fibers constituting the paper sheet of that portion are isolated, the pulp fibers are deformed such as bent and twisted, and the pulp fibers are sufficiently given kinetic energy to cause random movement. As a result, the pulp fibers and the long fibers of the spunbonded non-woven fabric are entangled by the composite action of these, and the long fibers are also entangled with each other, and the paper sheet and the non-woven fabric are integrated to obtain a composite sheet.

The wiping cloth of the present invention contains a resin composed of a synthetic polymer having an adhesive function in order to impart resistance (washing resistance) to washing and rubbing and washing to the composite sheet. The resin used must be water-insoluble after heating and drying. If the resin is soluble in water after heating and drying, the resin elutes during washing or rubbing to cause the pulp fibers to fall off, resulting in a decrease in the water absorption or water retention of the wiping cloth. Repeatedly washing and rubbing repeatedly causes the resin strength to gradually decrease, causing the pulp fibers to fall off, resulting in a decrease in the water absorbency and water retention of the wiping cloth. The use of cross-linking resins is suitable.

The glass transition temperature of the resin used in the present invention is -50 to + 20 ° C, preferably -45 to +10.
° C. When the glass transition temperature of the resin is higher than + 20 ° C., the rigidity of the resin increases, and as a result, the flexibility of the resin-coated composite sheet decreases, which is not preferable. On the other hand, when the glass transition temperature of the resin is lower than -50 ° C, the adhesiveness of the resin increases and the surface of the composite sheet coated with the resin becomes sticky, which is not suitable as a wiping cloth.

The resin used in the present invention includes
Conventionally known materials such as an aqueous emulsion of a resin composed of a synthetic polymer used as an adhesive for pigment coating and various kinds of laminating, latex, etc. can be used, but not particularly limited, for example, polyacrylic acid. Ester, polymethacrylic acid ester, ethylene-vinyl acetate copolymer,
Examples thereof include styrene-butadiene copolymers, nitrile-butadiene copolymers, polyester resins, polyurethane resins, and other aqueous emulsions or latexes. These resins may be used alone, or two or more kinds of resins may be mixed and used, and further, a crosslinking agent, an auxiliary agent such as a catalyst may be added and used as necessary. good. As described above, the form of the resin used may be present in the form of an emulsion in a solvent such as water or a solvent, or may be present in the form of a solution, and may be heated and dried after being applied to a composite sheet, It may be self-crosslinking and water-insoluble, for example, a self-crosslinking ethylene-vinyl acetate copolymer emulsion or a self-crosslinking acrylic resin emulsion.

The coating amount of the synthetic polymer resin having an adhesive function is 2 to 17% by weight, preferably 2.5 to 15% by weight, based on the absolute dry basis weight of the paper sheet constituting the composite sheet. . When the coating amount of the resin exceeds 17% by weight, the resin film is formed on the entire surface of the pulp fibers constituting the paper sheet, so that the rigidity of the paper sheet is increased and, as a result, the flexibility of the wiping cloth is reduced. Moreover, since the resin is hydrophobic, it lowers the hydrophilicity of the pulp fiber and lowers the water absorption and water retention of the wiping cloth, which is not suitable. In the present invention, JIS
There is no problem in practical use as long as the water absorption rate according to L 1096 is within 1.5 seconds. On the other hand, when the coating amount of the resin is less than 2% by weight, the amount of the resin is insufficient with respect to the amount of the pulp fiber, so that the pulp fiber cannot be fixed, and the pulp fiber may fall off during washing, so that the wiping cloth It is not suitable because it reduces the water absorption and the water retention required, and cannot be reused repeatedly.

As a means for incorporating the above-mentioned resin made of a synthetic polymer having an adhesive function into a composite sheet in which pulp fibers and long fibers are entangled, any conventionally known means can be used. Specifically, impregnation, size press, a coating method by spraying, a roll coater, a comma coater, a coating method by a slit die coater, and the like, further, such as a gravure coater, printing by a rotary screen, etc., It can be contained in the entire composite sheet or on the paper sheet side of the composite sheet by appropriately selecting it. In particular, without drying the composite sheet subjected to this high-pressure water column flow, the moisture content of the composite sheet is 15 to 75% by weight, preferably 30 to 70% by weight, according to JIS P 8127 by a squeezing machine such as a known roll press. A method in which a water-insoluble resin having an adhesive function is applied by a spray method only from the paper sheet side of the composite sheet after adjusting to the range of 10% is preferable.

Spraying the paper side of the composite sheet in the wet state results in rapid penetration of the resin into the sheet,
Not only the paper sheet side, but also the spunbonded nonwoven fabric side can be made to contain the resin uniformly, and water absorption, water retention, flexibility,
Sufficient washing resistance can be imparted to the composite sheet without impairing the performance such as wiping property. In this method, when the water content of the composite sheet exceeds 75% by weight, since the water content is excessive inside the sheet, it takes longer for the resin to permeate from the paper sheet side and reach the spunbonded nonwoven fabric side. In addition, when the water content of the composite sheet is less than 15% by weight, it becomes difficult for the resin applied by spraying to penetrate inside the sheet, and the resin does not reach the spunbonded nonwoven fabric side. In order to prevent the fibers from falling off, it is necessary to increase the coating amount of the resin or spray the resin on both sides of the composite sheet, and as a result, the softness, water absorption and water retention of the wiping cloth decrease. Not preferred. Moreover, in this method,
It is not necessary to heat and dry the resin before the resin is contained in the composite sheet, and since the resin can be contained online, the thermal efficiency and the operation efficiency are extremely excellent.

The α-cellulose content used in the present invention is 90.
Pulp fibers in an amount of not less than wt% have a small amount of residual hemicellulose and are elastic, and a paper sheet containing this fiber is hard to be crushed even when compressed in a wet state, and has very high flexibility. As described above, the content rate of α-cellulose is 9
A composite sheet obtained by subjecting a laminate of a paper sheet containing 0% by weight or more of pulp fibers and a spunbonded nonwoven fabric to a high-pressure water column flow to entangle and integrate the fibers with each other and further applying a resin made of a synthetic polymer Alternatively, it is contained by impregnation,
A wiping cloth made of a composite sheet obtained by being heat-treated thereafter is bulky and has excellent flexibility as a wiping cloth even after undergoing a squeezing operation involving compression before containing the resin, and water retention,
It has water absorbency and wash resistance, and is particularly excellent in wiping-off property, and the used wiping cloth does not spread in the thickness direction of the sheet even after removing stains by mechanical washing or rubbing by hand. It is crush-free, bulky, and can be reused repeatedly. This wiping cloth may be provided with a wetting agent such as water or propylene glycol, an antibacterial agent such as alcohols and parabenzoic acid ester, a fungicide, a chemical such as a fragrance, or the like, if desired. It is suitably used as an industrial wiper, a waste cloth, a counter cloth, a cloth, a rag, etc. without such additives.

[0027]

[Examples] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. In the examples and comparative examples, all percentages indicate% by weight.

Example 1 A spunbonded non-woven fabric was prepared in which polypropylene filaments were accumulated and which had a large number of point fusion zones in which the polypropylene filaments were self-bonded to each other. The fineness of the long fibers constituting this spunbonded nonwoven fabric was 2.3 denier, and the basis weight of the spunbonded nonwoven fabric was 14 g / m ² . The spot fusion area is 37.5 for 0.08 mm ^2.
The number of particles / cm ² was 3 area% based on the total surface area of the nonwoven fabric.
Next, commercially available dissolving pulp (Ketchikan, USA, trade name: K-120-N, α-cellulose content: 9
0.7%) and bleached softwood kraft pulp to make a mixed pulp having a dissolved pulp content of 25% based on the total dry pulp weight, and using this mixed pulp slurry, JIS P
Paper sheets were made according to 8209 in a laboratory square handmade machine. JIS P 812 of the obtained paper sheet
No. 4 basis weight is 95 g / m ² , and JIS P 81
The density according to 18 was 0.43 g / cm ³ .

Next, a paper sheet cut into a size of 20 cm × 25 cm was laminated on the spunbonded nonwoven fabric of the same size. The absolute dry basis weight ratio of the spunbond nonwoven fabric: paper sheet was 1: 6.2. Next, the laminated body was placed on a transfer conveyor formed of a wire mesh so that the paper sheet was on the upper side and the spunbonded nonwoven fabric was on the lower side, and the laminated body was transferred at a speed of 20 m / min. While making the hole diameter 0.
Using a high-pressure water column flow jetting device in which 12 mm nozzle holes are arranged in a staggered pattern at 0.64 mm intervals, 50 kg / cm ²
A high pressure water column flow is jetted by the water pressure of, and the high pressure water column flow is passed from the surface of the paper sheet toward the nonwoven fabric side, and a composite sheet in which pulp fibers of the paper sheet and long fibers of the spunbonded nonwoven fabric are entangled and integrated is formed. Obtained. This composite sheet is dehydrated with a press roll that can be pressurized by two axes, and then JIS P 812 is used.
After adjusting the water content according to No. 7 to 70.7%, it was dried with a blast dryer at 120 ° C., and the water content according to JIS method was adjusted to 2.0%.

Thereafter, a self-crosslinking acrylic resin emulsion (manufactured by Japan Synthetic Rubber Co., Ltd., product number: AE-948, glass transition temperature: -47 ° C.) was used as a synthetic polymer resin having an adhesive function to obtain a solid content concentration. A 4.0% adhesive solution was prepared. After immersing the dried composite sheet in this adhesive solution, the excess adhesive is squeezed out with a squeezing machine, and then it is heated and dried at 120 ° C. for 5 minutes with a blast dryer, and then dried with water according to the JIS method. A wipe made of 0.05% composite sheet was obtained. The content of the acrylic resin as a solid content in this wiping cloth was 4.0 g / m 2 on an absolute dry basis.
² (4.2% based on the weight of the paper sheet).

The obtained wipes were tested by the test methods shown below to evaluate quality for thickness, flexibility, water absorption, water retention, wipeability and wash resistance. (1) Thickness The thickness of the wiping cloth was measured with a load of 10 kpa according to JIS L1906. (2) Softness The softness of the wiping cloth was evaluated by the sense of touch. The sensory evaluation was carried out in the following 5 stages. 5 ... It was extremely flexible. 4 ... It was flexible. 3 ... The flexibility was normal. 2 ... The flexibility was slightly inferior. 1 ... Inferior in flexibility. (3) Water absorption The water absorption was evaluated by the water absorption rate measured by the method described in the JIS L 1096 6.26.1 dropping method.
The water absorption is practically no problem if the water absorption speed is 1.5 seconds or less.

(4) Water retention As for water retention, a wipe cloth was cut into a size of 10 cm × 10 cm, and four pieces thereof were used as a sample according to JIS P 812.
After measuring the absolute dry mass (W0) of the sample in accordance with No. 4, immerse the sample in a 10 liter container containing 6 liters of distilled water at room temperature for 1 minute, then remove the sample from water and remove it for 1 minute with water. After dripping, the mass (W1) of the sample was measured, and the water retention rate (%) = {(W1-W0) /
W0} × 100 was determined, and the higher the value, the better the water retention. When the water retention rate is 400 to 600%, it is suitable for practical use. (5) Wiping property The wiping property is obtained by cutting a wiping cloth into a size of 10 cm × 10 cm, using two of them as samples, and stacking two samples around a cylindrical weight of 5 cm in diameter and 1.6 kg. Fix it. 5 g of distilled water was placed on a rubber sheet having a size of 30 cm × 50 cm, the distilled water was wiped off once with a cylindrical weight to which the sample was fixed, and the weight of the distilled water remaining on the rubber sheet was measured. Was determined as the remaining amount of wiping, and the one with the smaller numerical value was regarded as good. If the remaining wipe amount is 0.5 g or less, there is no practical problem.

(6) Washing resistance As for the washing resistance, a wipe cloth was cut into a size of 10 cm × 10 cm, 10 pieces of the cut piece were used as samples, and the absolute dry mass (W0) of the samples was measured. Into a washing machine (manufactured by Sanyo Denki Co., Ltd., electric washing machine, SW-56 type), 30 liters of water was put, and standard washing was performed for 10 minutes with stirring to wash, and then the sample was taken out and dehydrated by hand squeezing. After that, the sample was dried at 105 ° C. for 60 minutes in a laboratory hot air circulation dryer, and the absolute dry mass (W1) of the sample was measured, and the weight change rate (%) before and after washing =
{(W0-W1) / W0} × 100 was obtained, and the smaller the value, the better the washing resistance. If the weight change rate is less than 3%, there is no practical problem.

Example 2 Softwood bleached kraft pulp (α-cellulose content: 87.
5% by weight) was immersed in a sodium hydroxide solution having a solid concentration of 17.5% at a liquid temperature of 20 ° C. for 1 hour, and then the pulp was taken out from the liquid and washed with water. The washing is repeatedly and sufficiently performed until the pH of the washing liquid becomes neutral, and the α-cellulose content is 1
A 00% alkaline mercerized pulp was obtained. Then, using the obtained alkali mercerized pulp and bleached softwood kraft pulp, a mixed pulp having a content of the alkali mercerized pulp of 60% based on the total dry pulp weight was used, and this mixed pulp slurry was subjected to JIS P 8209. A paper sheet was prepared using a square hand-made machine for laboratories. The basis weight of the obtained paper sheet was 95 g / m ² , and the density was 0.35 g / cm ³ . A high pressure water column flow was applied in the same manner as in Example 1 except that the above-mentioned paper sheet was used, and an acrylic resin was further added, followed by drying to obtain a wiping cloth made of a composite sheet, and its quality was evaluated. The content of the acrylic resin as a solid content in this wiping cloth was 4.1 g / m ² on an absolute dry basis (4.3% based on the weight of the paper sheet).

Example 3 Polyethylene terephthalate filaments were accumulated,
In addition, a spunbonded non-woven fabric having a large number of point-fused regions in which the polyethylene terephthalate long fibers were self-fused between themselves was prepared. The fineness of the long fibers constituting this spunbonded nonwoven fabric was 2.0 denier, and the basis weight of the spunbonded nonwoven fabric was 12 g / m ² . The spot fusion area is 0.0
The number of particles of 9 mm ² was 110 / cm ² , which was 10% by area based on the total surface area of the nonwoven fabric. Then, using the alkali mercerized pulp and the bleached softwood kraft pulp prepared in Example 2, a mixed pulp having a content of the alkali mercerized pulp of 10% based on the total weight of the absolutely dried pulp was used, and this mixed slurry was used to JIS P Paper sheets were made according to 8209 in a laboratory square handmade machine. The resulting paper sheet has a basis weight of 95 g / m ² and a density of 0.48 g / cm ^3.
Met. Next, the above-mentioned paper sheet was laminated on the spunbonded nonwoven fabric to form a laminate. The absolute dry basis weight ratio of the non-woven fabric and the paper sheet was 1: 7.3 for the non-woven fabric: paper sheet.

After that, the laminated body was placed on a transfer conveyor formed of a wire mesh so that the paper sheet was on the upper side and the non-woven fabric was on the lower side, and the laminated body was transferred at a speed of 15 m / min. While making the nozzle hole with a hole diameter of 0.15 mm 1 m
Using a high-pressure water column flow jetting device lined up at m intervals, 75
A high-pressure water column flow is jetted with a water pressure of kg / cm ² , and the high-pressure water column flow is passed from the surface of the paper sheet toward the non-woven fabric side to entangle pulp fibers and long fibers to integrate the paper sheet and the non-woven fabric. Obtained a composite sheet. This composite sheet was dehydrated with a press roll capable of being biaxially pressed to obtain a composite sheet in a wet state of 73.2% with water according to the JIS method. Next, a self-crosslinking ethylene / vinyl acetate / acrylic copolymer emulsion (manufactured by Sumitomo Chemical Co., Ltd., product number: S-
900, glass transition temperature: -20 ° C) with a solid concentration of 40
% And then sprayed onto the surface of the wet composite sheet (paper sheet side) at a pressure of 3 kg / cm ² to give a resin content of 5.5 g / m ² (5.8% based on the weight of the paper sheet). ), And then heat-dried for 1 minute with a blower dryer maintained at 120 ° C.
A wiping cloth composed of a composite sheet of 07% was obtained, and its quality was evaluated in the same manner as in Example 1.

Comparative Example 1 A paper sheet was prepared by using a pulp slurry of 100% bleached softwood kraft pulp in accordance with JIS P 8209 with each type of laboratory handmade machine. The obtained paper sheet had a basis weight of 95 g / m ² and a density of 0.53 g / cm ³ .
A high-pressure water column flow was applied in the same manner as in Example 3 except that the above-mentioned sheet was used, and then a resin was added by spraying,
A wiping cloth made of a composite sheet was obtained, and its quality was evaluated in the same manner as in Example 1.

Comparative Example 2 Using the alkali mercerized pulp and bleached softwood kraft pulp prepared in Example 2, a mixed pulp having an alkali mercerized pulp content of 3% based on the total dry pulp weight was prepared, and this mixed slurry was used. Using a square hand-made machine for laboratory according to JIS P 8209, basis weight 95g / m
² , except that a paper sheet having a density of 0.49 g / cm ³ was prepared, a high pressure water column flow was applied in the same manner as in Example 3, and then a resin was added by spraying to obtain a wiping cloth made of a composite sheet. The quality was evaluated in the same manner as in Example 1.

Table 1 shows the evaluation results obtained in Examples and Comparative Examples.
It was shown to.

[0040]

[Table 1]

As can be seen from Table 1, the wiping cloth made of the composite sheet obtained by the present invention has a large thickness and is excellent in flexibility, water retention and washing resistance, and particularly water absorption and wiping properties are remarkable. Is excellent (Examples 1 to 3). On the other hand, low α-cellulose content (87.5%)
When a paper sheet consisting of only pulp fibers is used (Comparative Example 1) or when the blending ratio of pulp fibers having an α-cellulose content of 90% or more (Comparative Example 2) is small, the thickness of the wiping cloth becomes small, Flexibility, water absorption, and water retention become poor relative to each other,
Wipeability is markedly deteriorated.

[0042]

As described above, the present invention has resistance to compression crushing, is bulky, and has excellent flexibility, water absorption, water retention and washing resistance as a wiping cloth, and in particular, has a wiping property. It is remarkably excellent and has the effect of providing a wiping cloth suitable as an industrial wiper, waste cloth, counter cloth, cloth, rag, or the like.

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Claims (1)

[Claims] 1. A resin composition of a thermoplastic polymer is melt-spun, a spun filament fiber group is collected to form a web, and the web is provided with regular and intermittent self-fusion zones. On one side of the spunbonded nonwoven fabric obtained as described above, a paper sheet made of pulp fibers is laminated, and a high pressure water column flow is passed through from the surface side of the paper sheet toward the spunbonded nonwoven fabric side,
In a wiping cloth obtained by entangled and integrating pulp fibers and long fibers of a non-woven fabric into a composite sheet, the composite sheet contains a synthetic resin, and the paper sheet contains pulp having an α-cellulose content of 90% by weight or more. A wiping cloth comprising 5 to 75% by weight of fibers.