JPH1099247A - Wiping sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a sheet hard to slip relative to hands and to improve effect of wiping dirt at a place to be cleaned, by making fine wrinkles on the surface of a bulky sheet to form a number of irregularity. SOLUTION: On the both sides of a first sheet S1 which is processed by a low crepe processing by which low extending rate is expressed on impregnating liquid or without crepe processing, a second sheet S1 processed by a high crepe processing and has an extending rate higher than that of the first sheet S1 is adhered by partially adhering at short adhering parts in an angle to the crepe wrinkle extending direction. Adhered parts A are formed in parallel arranged by rows of short adhering parts. When a cleaning agent is impregnated into each of first and second sheets S1 and S2, swellings of the second sheets S2 are generated between adhering parts A by the difference of extending rates of the sheets 1 and the sheets 2. As the result, a bulky wet sheet is constituted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wet or dry wiping sheet used for cleaning, disinfecting or sterilizing a flush toilet, wiping a human body, or cleaning a room or toweling. In particular, the present invention relates to a wiping sheet which is bulkier than conventional ones, is easy to handle, and has an improved dirt wiping effect.

[0002]

2. Description of the Related Art Wet sheets are used for cleaning toilets and rooms, or toweling. This wet sheet is obtained by impregnating a paper sheet formed of wood pulp fiber or the like with a cleaning chemical. The detergent solution contains a surfactant, a detergent component, a preservative, a fragrance, and the like in water and alcohol.

[0003]

However, in the conventional wet sheet, a flat sheet is used as one sheet, or two or three sheets are stacked and used, so that the bulk of the sheet itself is low. Was very thin. Therefore, when holding the sheet with the hand and wiping the cleaning place, the touch of holding the sheet with the hand cannot be obtained. For example, the hand and the sheet are slippery, and the use feeling is poor. Further, a flat wet sheet has a drawback that dirt cannot be sufficiently wiped from a cleaning place. In particular, when wiping a floor having irregularities, it is difficult to wipe off dirt in the concave portions. In addition, two or three flat sheets are stacked,
Some sheets have fine embossing on the sheet.
Since the sheet having such fine irregularities has a low bulk of the entire sheet, it has not been sufficiently improved in that the handling is inconvenient when performing the work of pressing and wiping by hand.
Further, in the case of fine embossments, there is a limit in improving the effect of removing dirt.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and enables a wet or dry wiping sheet to be made bulky so that the sheet can be easily held by hand during a cleaning operation. It is another object of the present invention to provide a wiping sheet capable of obtaining a feeling close to a cloth.

[0005] Further, the present invention not only makes fine wrinkles appear on the surface of a bulky sheet and forms many irregularities on the surface of the sheet by these wrinkles so that the sheet does not slip easily between hands.
It is an object of the present invention to provide a wiping sheet having an improved wiping effect of dirt on a cleaning place.

[0006]

In the wiping sheet of the present invention, a plurality of sheets are stacked, and the sheets are partially joined by a plurality of joints, and the joints are arranged at intervals. In addition, a plurality of rows of the joining portions are provided at predetermined intervals, and at least a sheet appearing on the surface has a pitch substantially equal to the pitch in the column direction of the joining portions in an intermediate region of the row of the joining portions. It is characterized in that wrinkles that repeat irregularities at the same pitch are formed.

For example, in the wiping sheet of the present invention, the first sheet having a low creping rate or no crepe and the second sheet having a higher creping rate than the first sheet are partially joined by a plurality of joints. The joining portions are arranged at intervals, and a plurality of rows of the joining portions are provided at predetermined intervals, and the elongation due to the restoration of the crepe of both sheets after both sheets are joined. Due to the difference in rates,
At least the second sheet is formed with wrinkles that repeat irregularities at substantially the same pitch as the pitch in the column direction of the joints in an intermediate region of the row of the joints. Becomes

In this case, it is preferable that the first sheet has a three-layer structure in which a second sheet is joined to both front and back surfaces of the first sheet. However, 2 of the first sheet and the second sheet
It may have a layered structure.

In the above description, the individual joints are short joints formed in a short linear shape, and the joints (short joints)
Is preferably formed obliquely to the column direction.

In FIGS. 1 and 2, the joints (short joints a) are arranged at a constant pitch p in the column direction.
The pitch p in the column direction may be different between the individual joints (short joints a), or the pitch p may change periodically as it goes in the column direction. Further, in FIGS. 1 and 2, the rows of the joints extend linearly in the Y direction, but the rows in which the joints are arranged do not necessarily have to be linear, and the rows may be curved or broken. It may extend.

The present invention is intended to form a cleaning sheet, a wipe sheet for wiping the butt and other wipes used in a wet state or a dry state by laminating a plurality of papers or non-woven fabrics, and to give a feeling of bulkiness to the whole. At least a surface sheet has irregular wrinkles appearing regularly. Further, by giving regular uneven wrinkles, the wiping effect is enhanced.

As a structure for causing irregular wrinkles to appear regularly on at least the surface sheet of the plurality of sheets, and for controlling the interval and pitch of the uneven wrinkles, the joints are arranged at intervals α in the row direction. Are arranged at, for example, a constant pitch p or a periodically changing pitch, and a plurality of rows in which a plurality of joints are arranged are provided at a predetermined interval β. Thus, in the region between the rows, for example, a concave portion is formed on the sheet at the joint portion, and a convex portion is formed between the joint portions, and the unevenness is formed at substantially the same pitch as the arrangement pitch p of the joint portion. The wrinkle which repeats can appear.

[0013] As a method of causing at least a sheet on the surface to show uneven wrinkles corresponding to the pitch of the joining portion, when the sheets are joined at a predetermined pitch, the sheets are subjected to a wrinkling process, and It is possible to form uneven wrinkles corresponding to the pitch of the joint while joining the sheets.

Alternatively, a first sheet having a low crepe rate or no crepe and a second sheet having a higher crepe rate than the first sheet are joined to each other by the joining portion. In this case, a three-layer structure in which the second sheet is bonded to both the front and back surfaces of the first sheet, or a two-layer structure in which only the first sheet and the second sheet are bonded may be used.
When each sheet is moistened after joining the sheets by a plurality of joints as shown in FIG. 2, the crepe wrinkles are restored and the sheet is stretched. Sheet elongation rate increases. Therefore the second
Is stretched while being restrained by the first sheet, and as a result, the second sheet swells on the first sheet. As shown in FIG. 2, the elongation of the second sheet is suppressed in the portion where the joints are formed, and the elongation of the second sheet increases between the pitches of the joints. In the region between the rows, there is a concave portion at a side portion with a joint, and a convex portion at a portion without a joint portion, and uneven wrinkles having substantially the same pitch as the arrangement pitch p of the joint portion appear.

Further, when each joint is formed in a short linear shape and the joint is formed obliquely with respect to the arrangement pitch, crepe wrinkles are not short-circuited in regions on both sides of the joint. The uneven wrinkles according to the arrangement pitch of the joints are formed independently in the region between the rows of the joints and between the regions adjacent to each other across the row of the joints.

The sheet in the present invention is, for example, paper of natural pulp (wood pulp) fiber or paper containing chemical fiber such as rayon, which has been creped as described above. Alternatively, it may be a nonwoven fabric.

The bonding between the sheets may be an adhesive bonding using a hot melt adhesive such as an EVA type, or the sheet contains a polyolefin resin fiber such as polyethylene (PE) or polypropylene (PP) or contains these. In the case of being formed of a composite fiber or the like, the bonding between the sheets may be heat welding of the fibers.

When the sheets are joined by a water-insoluble joining means such as a hot melt adhesive or heat welding, the joining of the sheets by the joining means due to the cleaning chemical contained in the sheets cannot be dissociated. Absent. As the cleaning chemical, a liquid containing a surfactant, a cleaning component, a preservative, a fragrance, and the like in water and alcohol is used. Alternatively, it may be sold in a dry state, and when used, the user may impregnate it with water or the cleaning chemical. When sold as a dry sheet, the sheet is impregnated with water or the like to form a swelling on the second sheet, and then the sheet is dried by hot air or the like. The wrinkles are retained even in the dried and dry state, so that the bulkiness of the sheet is not impaired.

Further, the sheet is a water-disintegrable sheet (water-disintegrated paper) comprising fibers such as natural pulp and a water-soluble or water-swellable binder such as carboxymethylated pulp or carboxymethylcellulose, which can be poured into a flush toilet. In this case, the sheets are bonded with a water-soluble adhesive such as carboxymethylcellulose to form the joint. In this case, as the cleaning liquid to be contained in the sheet, a liquid containing alcohol and metal ions such as calcium and strontium in water is used. The dissociation of the sheet and the dissolution of the adhesive by the chemical solution impregnated in the sheet are suppressed by this metal ion, so that the sheet strength can be maintained during use, and the cleaning chemical solution is diluted with water after flowing into the flush toilet. This allows the sheet to be hydrolyzed and the adhesive to be released.

The wiping effect of the wiping sheet depends on the pitch of the uneven wrinkles appearing on the sheet surface. As described above, the uneven wrinkles of the sheet are arranged at a pitch p in the row direction of the joints and an interval α between the joints. Is controlled by
As a result of the experiment, in order to effectively exert the wiping effect, the gap α in the row direction of the joint portion is 0.5 mm or more and 3.0 mm.
It is preferable that it is about the following. Also, if the interval β between the rows of the joining section is too wide, the stiffness of the uneven wrinkles between the rows becomes weak, the wiping effect due to the uneven wrinkles decreases, and if the interval β between the rows is too narrow, the row The uneven height of the uneven wrinkles generated therebetween becomes shallow. Therefore, the interval β between the rows of the joints is 7.5.
It is preferable that the thickness be not less than 15.0 mm and not more than 15.0 mm.

The spacing α (and the pitch p) in the row direction of the joining portions and the spacing β in the row of the joining portions also affect the bulkiness of the sheet. Further, the difference between the elongation rate due to the restoration of the crepe wrinkles of the first sheet and the elongation rate due to the restoration of the crepe wrinkles of the second sheet also affects the bulkiness. First
In order to have a moderate swelling between the first sheet and the second sheet, the difference between the elongation percentages of the first sheet and the second sheet is set to 20.
% And preferably 80% or less, more preferably 30% or more and 60% or less. Here, the elongation percentage is x, where x is the original length of the sheet, and Δx is the length of the sheet after the sheet is floated on the liquid and the crepe wrinkles are restored and expanded.
Is expressed as {(Δx−x) / x} × 100 (%).

The flexibility and strength of the sheet vary depending on the basis weight of the first sheet and the second sheet. In the present invention, the basis weight of each of the first and second sheets is 15%.
It is preferably at least g / m ^{2 and} at most 75 g / m ² .
When such a sheet is used, the first sheet and the second sheet
Sheet with a two-layer structure, the total weight of the sheet is 30
g / m ² or more and 150 g / m ² or less, and in a sheet having a three-layer structure in which the first sheet is bonded to both the front and back surfaces of the second sheet, the total basis weight is 45 g / m ² or more and 225 g / m ^2. It is as follows.

With such a configuration, it is possible to realize a wiping sheet which is bulky and appropriately wrinkled, is easy to grasp by hand, and has a high wiping effect.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the structure of the wiping sheet of the present invention. This wipe sheet 1
Is used for cleaning indoors such as toilets and kitchens, or for wiping towels, or for toweling, etc. It is used as a water-decomposable wet sheet that can be flushed into a flush toilet or a dry sheet that is used in a dry state.

The wiping sheet 1 includes a first sheet S
1 and a second sheet S2 partially adhered and joined by an adhesive joint A on both the front and back sides of the first sheet S1. The first sheet S1 is
The base paper sheet formed by pulp fiber or the like in a wet process is subjected to creping or non-creping, and the second sheet S2 has a higher elongation than the first sheet in the base paper sheet. It has been creped to give the desired rate. The adhesive joints A are provided linearly along the Y direction (column direction) with a certain interval in the X direction. When the wiping sheet 1 is impregnated with a cleaning chemical or the like and the sheet 1 gets wet, fine wrinkles due to creping are restored and the sheet is stretched.
2, S2 has a higher elongation than the first sheet S1,
Moreover, since the first sheet S1 and the second sheet S2 are partially restrained by the adhesive joint A, the second sheets S2 and S2 bulge in the region between the joints A and A. Deform. Further, fine wrinkles B appear on the second sheet S2.

FIG. 2 is an enlarged view of a part of FIG. 1 and schematically shows the shape of the adhesive joint A and the state of wrinkles appearing on it. The XY coordinates in FIG. It corresponds to the XY coordinates shown. The Y direction is the winding direction in the papermaking process, the X direction is the width direction, and the X direction is the longitudinal direction (crepe direction) in which fine wrinkles b due to creping work extend.

As shown in FIG. 2, the adhesive joint A is
A plurality of short straight joints a are arranged in a row at a constant pitch p in the Y direction, and each of the short joints a partially separates the first sheet S1 and the second sheet S2. Adhesively bonded. The space between adjacent short joints a arranged in the column direction is indicated by α. Each short joint portion a is formed obliquely at an angle to both the direction of the pitch p (Y direction) and the crepe direction (X direction). Further, the interval between the rows of the short joints a (the Y rows) is denoted by β.

When each of the sheets S1, S2, S2 is impregnated with a cleaning chemical, fine wrinkles b due to creping work tend to expand in the Y direction. At this time, since the first sheet S1 and the second sheet S2 are bonded at the short joining portion a,
In this portion, the second sheet S2 is unlikely to elongate in the Y direction. On the other hand, the second sheet S2 is easily stretched in the Y direction in the portion at the interval α sandwiched between the short joints a and the portion due to the extension in the Y direction (a) is loosened. It's easy to do. As a result, in a region sandwiched between the adhesive joints A and A, that is, in a region L between rows of the short joints a, a valley is formed at a portion connecting the short joints a on both sides. It is formed in a band shape, and a band-shaped crest connecting both sides appears. Therefore, in the region L interposed between the rows formed by the short joints a, wrinkles B which repeat irregularities at a pitch substantially matching the arrangement pitch p of the short joints a appear. The width of the crest B in the Y direction is determined by the interval α of the short joint a, and the width of the valley in the Y direction is determined by the width γ of the short joint a in the Y direction. Can be

The individual short joints a are formed to be inclined so as to have an angle with respect to the arrangement pitch direction (Y direction) and the crepe forming direction (X direction). When the joint part a is viewed, there is an overlap amount δ in the Y direction between the short joint part a and the short joint part a.
Therefore, the crepe wrinkles b in the area L between the rows and the crepe wrinkles b in the area L1 between the adjacent rows are always interrupted by the diagonal short joints a serving as a boundary, and the connection between the area L and the adjacent area L1 is formed. None of the crepe wrinkles b are continuous. In order to explain this, in FIG. 2, one crepe wrinkle is represented by a dotted line b, but the dotted line b extending over the region L and the region L1 is shown no matter where the dotted line b is drawn. Is always interrupted at any one of the short junctions a. Therefore, the uneven wrinkles B of the second sheet S2 are formed independently of each other in the region L and the region L1.
Since the uneven wrinkles B are independently formed in the region L and the region L1, the stiffness of each of the uneven wrinkles B can be increased, and a strength that is not easily crushed can be provided. When the wrinkles B surely appear, the wiping sheet 1 as shown in FIG. The wrinkles B make it easier to grasp the wiping sheet by hand, and the wrinkles B make the sheet 1 uneven, so that the effect of wiping dirt can be enhanced.

In order to make the wrinkles B with constant irregularities effectively appear on the second sheet S2 having a high elongation, the pitch p of the individual short joints a arranged in the Y direction at the adhesive joint A is constant. Is preferable. However, the pitch p may change periodically. The width of the peak in the Y direction is determined by the interval α between the short joints a. However, if the interval α is too large, the width of the peak increases, and the bulge due to the peak tends to be crushed. During the continuous wiping, the crests of the wrinkles B are deformed flat and the dirt wiping effect is reduced. Conversely, if the interval α is too short, the width of the peak becomes too small, the bulge of the wrinkles B becomes small, the wiping effect is reduced, and the sheet does not feel bulky.

Accordingly, in order to make the sheet bulky by giving a moderate bulge to the peaks and to enhance the wiping effect, the interval α between the short joints a arranged in the Y direction is set to 0.5 mm or more and 3.0 mm. It is preferable to set the following. However, even if the interval α is 0.5 mm or more and 5.0 mm or less, the wiping effect can be sufficiently expected as compared with the conventional sheet.
Even at 0 mm or less, there is not much problem except for the collapse of wrinkles. Therefore, the interval α may be 0.5 or more and 5.0 mm or less, or 0.5 mm or more and 10.0 mm or less.

On the other hand, the width dimension γ of the short joint a is
Affects the width of the valley in the Y direction. If the width dimension γ is too large, the area occupied by the valleys in the sheet as a whole becomes too large, so that the sheet does not feel bulky, and the number of peaks is reduced, and the wiping effect is reduced. Therefore, it is preferable that the width of the valleys is equal to or less than the width of the ridges.
Must be equal to or less than the interval α. Further, the degree of formation and swelling of the wrinkles B of the sheet 1 is determined by the distance between the adhesive joint A extending in the Y direction and the adhesive joint A parallel thereto, that is, the distance between the rows of the short joints a. It also depends on β.

If the interval β between the columns is too large, the width of the region L between the columns becomes long, and the wrinkles B of the region L extend long, so that the unevenness of the wrinkles B becomes weak. Therefore, wrinkles B are likely to be crushed when dirt is wiped off. Conversely, if the interval β between the rows is too small, the ratio of the area of the adhesive joint A to the area where the uneven wrinkles B bulge in the sheet becomes too large, and the bulkiness of the sheet becomes poor. Therefore, the interval β between the rows of the short joints a is 7.5 mm.
It is preferable that the thickness be 15.0 mm or less. However, even if the interval β is 20.0 mm or less, a wiping effect superior to the conventional wiping sheet can be exerted as a wiping sheet except that the wrinkles are easily crushed.

FIGS. 3A, 3B and 3C show an example of a method of manufacturing the wiping sheet 1 in the order of steps. First, FIG.
As shown in (A), the adhesive 2 is applied to both front and back surfaces of a first sheet S1 that has not been subjected to low creping or creping, and the second sheets S2 and S2 are both front and back surfaces of the first sheet S1. Layered on. The first sheet S1 and the second sheet S2 are manufactured from wood pulp fiber, non-wood pulp fiber, rayon fiber, or the like as a raw material by a wet papermaking method using a papermaking machine, and then creped. It was done. As described above, the crepe rate of the sheet S2 is set higher than the crepe rate of the sheet S1.

In order to have a moderate swelling between the rows of the short joints of the second sheet S2, the first sheet S
The difference in elongation due to restoration of crepe wrinkles between the first sheet S2 and the second sheet S2 is preferably 20% or more and 80% or less, more preferably 30% or more and 60% or less.
If the difference in elongation is smaller than the above range, the entire wiping sheet 1 cannot be made bulky, and if it is larger than the above range, the swelling amount of the second sheet S2 becomes too large, and The hills are high, the stiffness of the hills is weak, and they are easily crushed. In addition, the thickness of the wiping sheet 1 becomes too large, and when the wiping sheets 1 are stacked in a container, they become bulky in the container.

If the basis weight of the first sheet and the second sheet is too large, the flexibility of the sheet is lowered, and the sheet is stiff and difficult to wipe off. There is a problem such as the sheet being broken on the way. Therefore, the basis weight of the first and second sheets is preferably 15 g / m ² or more and 75 g / m ² or less. When such a sheet is used, in the case of the two-layer structure of the first sheet and the second sheet, the total basis weight of the sheet is 30 g / m ² or more and 150 g / m ² or less, and both sides of the first sheet are used. The sheet having a three-layer structure in which the second sheet is bonded to the second sheet has a total basis weight of 45 g / m ² or more and 225 g / m ² or less.

An adhesive 2 is applied to the first sheet S1 so as to have a bonding pattern shown in FIG. 2. As the adhesive, for example, a polyolefin-based material such as water-insoluble polyethylene or polypropylene, or an EVA-based hot material is used. Melt adhesive is used. When the sheets S1 and S2 are water-disintegrable sheets, water-soluble carboxymethyl cellulose or the like is used as the adhesive. Then, after the adhesive is applied, the second sheets S2 and S2 are superimposed on both the front and back surfaces of the first sheet S1, and are pressed by the heating plates 4 and 5 while being humidified. The heating plate 5 is provided with an emboss 5a corresponding to the pattern of the adhesive joint A, and the sheet is pressed and heated by the emboss 5a, so that the first sheet S1 and the second sheet S2 are joined. At A, they are bonded to each other. FIG. 3B shows the joined state.

[0038] A cleaning solution (water in the case of a water-decomposable sheet, such as metal ions, etc.) in which water and alcohol, a surfactant, a preservative, a deodorant, an aromatic and the like are mixed into the wiped sheet 1 thus adhered. Is contained). When the detergent is impregnated, fine wrinkles b due to the creping process expand in the Y direction, and as shown in FIG. 2, the second sheet S2 is moved in the Y direction at a portion sandwiched between the short joints a and the short joints a. Adhesive joints A extending in the Y direction
A valley connecting the short joints a and a peak connecting the short joints a appear in a region L interposed between the adhesive joint A and the short joints a in the region L interposed between the adhesive joints A.
The wrinkles B of the unevenness almost coincide with the arrangement pitch p. The wiping sheet 1 thus formed is put in a plastic container or the like in a wet state impregnated with a detergent solution.

The wiping sheet 1 is not limited to a wet sheet but may be a dry sheet. In this case, after the first sheet S1 and the second sheet S2 are bonded and bonded in the manufacturing process, the second sheet is impregnated with the cleaning chemical solution, the disinfecting or sterilizing water, and the fungicide, and the second sheet is wrinkled. After forming B, it may be dried with hot air or the like. As described above, even after the wiping sheet 1 is dried, the wrinkles B maintain the swelling, and the sheet can be made bulky. In addition, as shown in FIG. 4, a first sheet S1 that has been subjected to a low elongation creping process or has not been subjected to a creping process, and a second sheet S2 that has been subjected to a high elongation creping process. May be stacked one by one to form a two-layer structure.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the wiping sheet of the present invention, the interval α between short joining portions a adjacent in the row direction is 0.5 mm or more and 3.0.
mm, the interval β between the rows of the adhesive joints A is not less than 5.0 mm and not more than 15 mm, and the first and second sheets S1,
The optimum basis weight of S2 was set to 15 g / m ² or more and 75 g / m ² or less. The following wiping was performed to examine the bulk (thickness), flexibility, and wiping effect of the wiping sheet formed under such conditions. The test was performed.

(1) Test on the spacing α in the row direction of the short joints a First, the distance between the short joints a capable of forming appropriate wrinkles (irregularities) due to elongation of crepe wrinkles while maintaining the bulkiness of the wiping sheet. The following tests were performed to determine α. A high crepe paper having a basis weight of 60 g / m ² and a crepe ratio of 50% made of pulp fiber is used as the second sheet, and a non-crepe paper having a basis weight of 30 g / m ^{2 also} made of pulp fiber is used as the first sheet. The adhesive is partially applied to both the front and back surfaces of the first sheet, the second sheet is overlapped on both the front and back faces of the first sheet, and both sheets are pressure-bonded by a heating plate shown in FIG. Was formed.

At this time, the interval α between the short joints a of the first sheet and the second sheet is 0.6 mm, 1.5 mm,
Five examples of 3.0 mm, 5.0 mm and 10.0 mm were produced. In each case, the interval β between the rows of the short joints a was 7.5 mm. After the first and second sheets were adhesively bonded, the sheets were impregnated with a cleaning chemical solution containing alcohol in water to cause swelling of the second sheets due to elongation of crepe wrinkles.

Test object for wiping test (wiping object)
As a kitchen tile floor was used. The area of the floor where the wiping was performed was 500 mm × 500 mm, the protrusion of the tile was a square of 28 mm × 28 mm, and the depth of the groove was 0.85 mm. An appropriate amount of dust and opened pulp was sprayed on the floor, and the floor was wiped five times with the wiping sheet of each example. Observe the condition of the floor after wiping,
The degree to which the dust stain and the opened pulp in the groove were wiped off was evaluated by ○ △ ×. Also, after wiping, the degree of crushing of wrinkles on the surface used for wiping the sheet was observed, and the degree of crushing was evaluated as ○, slightly crushed as Δ, and considerably crushed as ×. Further, the thickness of the wiping sheet before the wiping operation was measured. The results of the above tests are shown in Table 1 below.

[0044]

[Table 1]

As shown in Table 1, when the interval α between the short joints is 0.6 mm, the apparent thickness of the wiping sheet is relatively large at 2.43 mm, and the bulk is bulky as a whole.
Moreover, the formation state of the uneven wrinkles B was moderate, and the wiping of dust and the wiping of the opened pulp were effectively performed.
In addition, the wrinkles were hardly crushed during the wiping operation because the wrinkles B had high strength (high stiffness), and wiping could be performed while maintaining the bulkiness. When the distance α between the short joints is 1.5 mm, the thickness of the sheet is 2.14 mm, which is slightly lower than that when the pitch is 0.6 mm. And wrinkles hardly collapsed, making it easy to handle.

When the distance α between the short joints is 3.0 mm,
The width of the crests of the uneven wrinkles B is increased, the bulk is reduced as a whole, and the thickness is reduced to 2.06 mm. Further, since the width of the crests of the uneven wrinkles B was too large, the stiffness of the crests was weak, and the wrinkles were easily crushed during wiping. Short joint spacing α
Is 5.0 mm, the ridges of the uneven wrinkles B are further widened, the bulk is reduced, and the thickness is reduced to 2.0 mm.
Further, since the width of the mountain portion is wide, the wrinkles of individual wrinkles are weakened, the wrinkles are easily crushed, and the dust wiping effect is also slightly inferior.

When the interval α between the short joints is 10.0 mm, the peaks of the uneven wrinkles are widened, and the thickness of the sheet is 1.9 m.
m. In addition, unevenness is reduced, and the effect of wiping fine dirt such as dust is slightly inferior, and wrinkles are easily crushed after the wiping operation. From the above, in order to be bulky, it is difficult for uneven wrinkles to be crushed by the wiping operation, and the dirt wiping effect can be enhanced, the interval α in the row direction of the short joints a is 0.5 mm or more and 3.0 mm or less. Is preferred. However, if the interval α is 0.5 mm or more, it is 5.0.
Even if the thickness is less than 1 mm, the wiping effect can be sufficiently expected compared with the conventional sheet. Even if the thickness is less than 10.0 mm, there is not much problem except for the collapse of the wrinkles. Therefore, when the interval α is 0.5 or more and 5.0 mm or less, or 0.5 mm or more and 10.0 mm or more
It may be as follows.

(2) Test on spacing between rows of short joints In order to maintain the bulkiness of the wiping sheet and to examine the spacing β between rows of short joints for forming appropriate wrinkles (irregularities). The following test was conducted. 60 g of pulp fiber weight
/ M ² , a high crepe paper having a crepe ratio of 50% is used as a second sheet, and a non-crepe paper having a basis weight of 30 g / m ² , also made of pulp fiber, is used as a first sheet. Was partially applied, the second sheet was overlapped on both the front and back surfaces of the first sheet, and both sheets were pressure-bonded with a heating plate shown in FIG. 3A to form a three-layer wipe sheet. . The interval α between the short joining portions joining the first sheet and the second sheet was set to 0.6 mm based on the test result of the above (1). The interval β between the rows of short joints (adhesive joints) is 7.5 mm, 10.0 mm, 15.
Four types, 0 mm and 20.0 mm, were used as examples. After the first sheet and the second sheet were bonded and bonded, the sheet was impregnated with a detergent solution containing alcohol in water to cause swelling of the second sheet due to elongation of crepe wrinkles.

As a comparative example, a wiped sheet having a dot-shaped embossed joint was used. A wiping test was performed using the wiping sheets having different rows β in the rows of the short joints. As a test object (wiping object), the same one as in the test (1) was used.

An appropriate amount of dust and spread pulp were sprayed on the floor, and the floor was wiped five times with the wiping sheets of the above Examples and Comparative Examples. The state of the floor after wiping was observed, and the degree of dust stain and the opened pulp in the groove was wiped off, and evaluated by △ x. Also, the degree of crushing of the wrinkles after wiping was evaluated as け れ ば if the degree of crushing was small, △ if slightly crushed, and × if fairly crushed. The thickness of each wiping sheet before the wiping operation was measured. The results of the above test are shown in Table 2 below.

[0051]

[Table 2]

As shown in Table 2, when the interval β between the rows of the short joints is 7.5 mm and 10.0 mm, the length in the X direction of the uneven wrinkles B generated between the rows is moderate. And the thickness of the sheet is 2.43 mm and 2.44 mm, respectively.
It became thick and bulky. In addition, since the length of the uneven wrinkles B between the rows in the X direction is appropriate, the wrinkles of the individual wrinkles are strong and the strength at the time of wiping is excellent. Therefore, the dust and the opened pulp could be wiped off neatly. In addition, the degree of crushing of the wrinkles was small, and even after continuous wiping, it was bulky and easy to grasp by hand.

The distance β between the adhesive joints is 15.0 mm.
In this case, the swelling of the second sheet S2 is increased, and the sheet interval can be made thicker than that in the case where the interval between rows is 7.5 mm and 10.0 mm, and the apparent thickness is 2.53 mm.
Becomes In addition, the dust and the opened pulp can be wiped clean. However, since the dimension in the X direction of the uneven wrinkles appearing between the rows was long, the stiffness of the uneven wrinkles was slightly weakened, and the wrinkles were slightly crushed after the wiping operation.

When the interval β is increased to 20.0 mm, the swelling of the wrinkles is not hindered between the rows.
Although the sheet can be made as thick as 2.53 mm, the dimension of the uneven wrinkles in the X direction is too long, the stiffness is weakened, the unevenness is easily crushed, and the dust wiping effect is slightly reduced. Further, in the comparative example in which the dot-shaped joining portion is formed on the entire surface of the sheet, the area of the convex portion is larger than the concave portion, and the unevenness is small, so that the effect of wiping dust and opened pulp is small.

In the present invention, as shown in FIG. 2, the uneven wrinkles B in the region L between the rows of the short joints and the uneven wrinkles in the region L1 between the adjacent lines are separated by the oblique short joints a. As a result, independent uneven wrinkles are formed between the rows of the short joints. Therefore, the interval β between the rows determines the length of the individual uneven wrinkles B in the X direction. When the length in the X direction is long, the stiffness of each uneven wrinkle B becomes weak. When the interval between the rows is short, the area occupied by the short joints becomes too large, and the bulging of the second sheet S2 deteriorates the bulkiness. Therefore, the interval β
Is preferably 5.0 mm or more and 15.0 mm. By providing such an interval between the rows, the sheet can have a certain height, an appropriate unevenness can be formed on the entire surface of the sheet, and an appropriate stiffness can be provided by the adhesive joint, Excellent wiping effect. However, even if the interval β is 20.0 mm or less, a wiping effect superior to the conventional wiping sheet can be exerted as a wiping sheet except that the wrinkles are easily crushed.

(3) Test on the basis weight of the sheet The first sheet and the second sheet optimal for maintaining the bulk and flexibility of the wiping sheet, and the first sheet and the second sheet
In order to examine the basis weight of the wiping sheets formed by the sheets of Examples 1 and 2, tests were performed using the wiping sheets of Examples 1 to 3 and Comparative Examples 1 and 2 shown below.

Example 1 A crepe rate of 5 was obtained at a basis weight of 15 g / m ² composed of pulp fibers.
A 0% high crepe paper was used as a second sheet, and a non-crepe paper made of pulp fiber and having a basis weight of 15 g / m ² and not creped was used as a first sheet.
A wiping sheet having a sandwich structure in which a second sheet was joined to both the front and back surfaces of the sheet was formed to obtain a sheet of Example 1. The joining of the first sheet and the second sheet,
After partially applying the adhesive to both the front and back surfaces of the second sheet and stacking the first sheet and the second sheet, the portion where the adhesive is applied by embossing the heating plate as shown in FIG. Pressure was applied to bond the two sheets together. Based on the results of the tests (1) and (2), the adhesive bonding was performed by setting the interval α between the short joints to 0.6 mm and the interval β between the rows to 7.5 mm. The spacing α and the spacing β between the columns are determined in the following Example 2.
And 3, and Comparative Examples 1 and 2. After the bonding, the sheet was impregnated with a cleaning chemical solution in which water and alcohol were mixed to cause swelling between the bonded portions A of the second sheet, thereby forming a bulky wiping sheet.

Example 2 As in Example 1, sheets made of pulp fibers were used as the first and second sheets. The basis weight of each of the first and second sheets was 30 g / m ^2, and other conditions, namely, the crepe ratio of the first and second sheets (the first sheet was no crepe paper), the first and second sheets The wiping sheet was formed using exactly the same adhesive as used in Example 1, the bonding method, the intervals α and β of the short bonding portions, the cleaning solution, and the like as in Example 1.

Example 3 A wipe sheet was formed in the same manner as in Examples 1 and 2 except that the basis weight of the first sheet and the second sheet was changed to 70 g / m ^2, and the other conditions were completely the same. . As a comparative example with respect to Examples 1 to 3, the following wiping sheets were formed.

Comparative Example 1 In Comparative Example 1, the basis weight of each sheet was smaller than in Examples 1 to 3, and the basis weight of each of the first sheet and the second sheet was 10 g / m ² . The other manufacturing conditions were the same as in Example 1.
Or exactly the same as 3.

Comparative Example 2 In Comparative Example 2, each sheet had a larger basis weight than that in Examples 1 to 3, and the first sheet and the second sheet each had a basis weight of 70 g / m ² . It was used. Other manufacturing conditions were exactly the same as in Examples 1 to 3 and Comparative Example 1.

The total basis weight and apparent thickness of the wiping sheets of Examples 1 to 3 and Comparative Examples 1 and 2,
And the thickness after pressurization at a pressure of 1 kg / cm ² was measured, and the softness of the wiped sheet was further examined. The total basis weight was expressed in units of g / m ² , and the thickness was expressed in mm. The softness of the sheet is represented by ◎ for a soft one, ○ for a relatively soft one, and x for a lack of flexibility. The results are shown in Table 3 below.

[0063]

[Table 3]

As shown in Table 3 above, the basis weight of the wiped sheet of Example 1 was 45 g / m ² , the thickness was 2.4 mm, and the thickness after pressing was 1.5 mm. The sheet was very soft and was evaluated as ◎. Further, the basis weight of the wiped sheet of Example 2 was 90 g / m ² and the apparent thickness was 2.4 mm, which was the same as that of the sheet of Example 1. It is thicker than. Also, the softness of the sheet is evaluated by ○,
It can be seen that the flexibility is slightly lower than that of Example 1 due to the large basis weight. The total weight of the wiping sheet of Example 3 was 210 g / m ² and the apparent thickness was 2.45 m.
m is slightly thicker than in Examples 1 and 2, and the thickness after pressing is 2.2 mm, which is thicker than in Examples 1 and 2, and can maintain a feeling of bulkiness. However, the flexibility was slightly lower than that of Example 1, but evaluated as good ○.

On the other hand, in Comparative Example 1, since the basis weight of each sheet was as small as 10 g / m ² , the basis weight of the entire sheet was also 3 g / m ^2.
It is as small as 0 g / m ² . Therefore, the thickness before pressing is 2.4m
m is the same as in Examples 1 to 3, but the thickness after pressing is as small as 1.0 mm and very soft. In Comparative Example 2, the weight of each sheet was 1
As large as 200 g / m ^2, the total basis weight of the wiping sheet is as large as 300 g / m ^2. Therefore, the thickness after pressing is as large as 2.2 mm, and the bulk of the sheet can be kept high. However, the flexibility was low correspondingly, and was evaluated as x.

From the above test results, if the basis weight of the first and second sheets is too small, the flexibility is high, but the thickness after pressing is small, and the bulkiness cannot be maintained when wiping.
Also the stiffness becomes weak. Conversely, if the basis weight is large, the thickness after pressurization is large, and the bulk of the sheet can be kept high during the wiping operation, but the stiffness of the sheet is too strong and it is difficult to grasp by hand, The sheet is not easily deformed in accordance with the condition, and the wiping effect is low. Therefore, the basis weight of each sheet is preferably 15 g / m ² or more and 75 g / m ² or less, and a three-layer structure in which the first sheet is bonded to both the front and back surfaces of the second sheet as used in the above test. The total weight of the sheet is 45
g / m ² or more and 225 g / m ² or less. In the case of the two-layer structure of the first sheet and the second sheet, the total basis weight of the sheet is 30 g / m ² or more and 150 g / m ² or less. Is preferred. The wiping sheet formed with such a basis weight sheet can maintain a bulky feeling even during the wiping operation and has flexibility, so that it is easy to grasp by hand and has a high effect of wiping off dirt.

[0067]

As described above, according to the present invention, since the surface of the sheet is formed with uneven wrinkles, a wiping sheet having a bulky and high wiping effect can be obtained.

When uneven wrinkles on the surface of a sheet are caused by, for example, a difference in elongation rate of crepe wrinkles between sheets,
The pitch in the Y direction and the length in the X direction of the uneven wrinkles can be controlled by the intervals α and β of the intermittent joints formed in rows. Therefore, it is possible to obtain a wiping sheet which has a feeling of swelling as a whole, increases the strength of uneven wrinkles, is hard to be crushed, and has an excellent dirt wiping effect.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall structure of a wiping sheet of the present invention;

FIG. 2 is an enlarged view of a part of FIG. 1, showing a plan view of a shape of an adhesive joint and a state of wrinkles appearing thereby;

FIGS. 3A, 3B, and 3C are cross-sectional views sequentially showing a part of the manufacturing process of the wiping sheet of the present invention;

FIG. 4 is a cross-sectional view showing another example of the configuration of the sheet laminated structure;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wiping sheet 2 Adhesive S1 First sheet S2 Second sheet A Adhesive joint B Wrinkle a Short joint p Pitch of short joint α Space of short joint in row direction β Spacing of short joint γ Width of short joint

Claims (7)

[Claims] 1. A plurality of sheets are overlapped, the sheets are partially joined by a plurality of joints, the joints are arranged at intervals, and a row of the joints is arranged at a predetermined interval. In a sheet provided at a plurality of rows and at least appearing on the surface, wrinkles that repeat irregularities at substantially the same pitch as the pitch in the column direction of the joints are formed in an intermediate region of the arrangement row of the joints A wiping sheet, characterized in that it has been wiped. 2. The method according to claim 1, wherein the first sheet having a low crepe ratio or a crepe and a second sheet having a higher crepe ratio than the first sheet are partially joined by a plurality of joints, The joints are arranged at intervals, and a plurality of rows of the joints are provided at a predetermined interval. At least the first joint is formed due to the difference in elongation due to the restoration of the crepe of both sheets after the two sheets are joined. 2. The wiping sheet according to claim 2, wherein a wrinkle that repeats irregularities at substantially the same pitch as the pitch of the joints in the row direction is formed in the middle area of the row of the joints. 3. The wiping sheet according to claim 2, wherein the second sheet is bonded to both sides of the first sheet. 4. The wiping sheet according to claim 1, wherein the individual joints are formed in a short linear shape, and the joints are formed obliquely to the row direction. 5. The distance between adjacent joints in the column direction is
The wiping sheet according to any one of claims 1 to 4, wherein the wiping sheet has a thickness of 0.5 mm or more and 3.0 mm or less. 6. An interval between rows of the joints is 5.0.
The wiping sheet according to any one of claims 1 to 5, wherein the wiping sheet has a thickness of not less than 15.0 mm and not more than 15.0 mm. 7. The weight of each sheet is 15 g / m.
The wiping sheet according to any one of claims 1 to 6, wherein the wiping sheet has a weight of ² or more and 75 g / m ² or less.