JP2000254058A - Cleaning sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a cleaning sheet excellent in capture and holding characteristics of various sizes and shapes of refuse. SOLUTION: A cleaning sheet 1 is formed by intermittently joining long fiber aggregates (Tow) 3 opened and arranged in parallel to at least one surface of a base material sheet 2. The elongation of the long fiber aggregates 3 under low stress in the direction of the fibers is equal to or higher than the elongation of the base material sheet under low stress in the direction of the fibers. The elongation of the long fiber aggregates 3 upon load of 100 gf/25 mm in the direction of the fibers is preferably three times as high as or higher than the elongation of the base material sheet 2 upon load of 100 gf/25 mm in the direction of the fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning sheet. More specifically, the present invention provides a long-fiber aggregate (Tow) having a higher elongation bonded to a base material sheet, and has an improved ability to capture and retain dust of various sizes and shapes. It relates to an excellent cleaning sheet.

[0002]

2. Description of the Related Art Conventionally, cleaning sheets using various nonwoven fabrics such as spunlace and thermal bond have been known. These are widely used on the market because they can be attached to a cleaning tool such as a cleaning mop for business use or home use, and can be used very easily. These conventional cleaning sheets using a nonwoven fabric have been required to increase the number of entanglement points and bonding points between fibers in order to maintain the sheet strength. However, as the number of entanglement and joining points increases, the degree of freedom of the fiber is lost,
Although relatively small dust could be captured by adsorption to the fiber surface, large dust could hardly be wiped off. For example, Japanese Patent No. 2765690 discloses a cleaning sheet in which a nonwoven fabric aggregate formed by fiber entanglement of a fiber web is integrated in one or both sides of a mesh sheet in an entangled state. Have been. However, in the cleaning sheet disclosed in the publication, since the fiber aggregate is integrated with the sheet in an entangled state,
There is no degree of freedom in the fibers, and it is impossible to take in large dusts in the fibers or to retain entangled dust and hair in the fibers. Also, since there is no degree of freedom of the fiber in the thickness direction, there is no movement of the fiber in the thickness direction of the fiber, and there is no thickness. There was a drawback that the fibers did not reach the dust and were wiped off.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems of the prior art, and to collect, entangle, collect and hold dust of all shapes and sizes. It is an object to provide a cleaning sheet that can be used.

[0004]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that by integrating fiber assemblies having different elongations in a low elongation state, the remaining capacity to expand into a high elongation fiber assembly is obtained. The present invention has been found that it is possible to form a sheet with the degree of freedom of the fiber remaining high, and that the fiber aggregate having a high degree of fiber freedom can capture and hold all kinds of dust. Was completed.

[0005] That is, the present invention is a cleaning sheet in which long fiber aggregates (Tow) which are opened and arranged in parallel are intermittently bonded on at least one surface of a base material sheet. A cleaning sheet, wherein the elongation of the fiber assembly at a low stress in the fiber direction is equal to or greater than the elongation of the base sheet in the fiber direction; the elongation of the long fiber assembly in the fiber direction at a load of 100 gf / 25 mm. The cleaning sheet has an elongation of at least three times the elongation under a load of 100 gf / 25 mm in the fiber direction of the base sheet; the maximum tensile strength of the long fiber aggregate in the fiber direction being 5 k;
g / 25 mm or more; the cleaning sheet characterized in that the elongation of the long fiber aggregate is expressed by crimping of the fiber; and an oil agent. The cleaning sheet described above.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the cleaning sheet of the present invention will be described below with reference to the accompanying drawings. 1 to 3
1 shows a plan view of the cleaning sheet of the present invention. FIG.
FIG. 2 is a partial cross-sectional view of the cleaning sheet of FIG. 1 along the line A-A ′.

[0007] As shown in these figures, the cleaning sheet 1 of the present invention has a long fiber aggregate (Tow) 3 joined to a base sheet 2 by a joining line 4. The long fiber aggregate may be joined to only one surface of the base sheet, or may be joined intermittently to both surfaces of the base sheet. Preferably, the joints are intermittently joined as shown in these figures. The intermittent joining allows the fibers to move freely between the joining lines. When the long fiber aggregates are not intermittently joined in this way, the cleaning sheet described in Japanese Patent No. 2765690 is inferior in catching and retaining large dust and three-dimensional dust. It will be.

Further, in the cleaning sheet of the present invention,
The elongation at low stress in the fiber direction of the long fiber aggregate is required to be equal to or more than the elongation in the fiber direction of the base sheet.
According to this requirement, any fibrous shape such as hair, or any three-dimensional shape such as bread crumbs, and dust of any size is entangled with the constituent fibers, and the entangled dust is removed by the voids of the constituent fibers. Can be held. Examples of the types of dust that can be captured and held by the cleaning sheet of the present invention include fibrous dust such as hair and three-dimensional dust such as bread crumbs. When the elongation of the long fiber aggregate is smaller than the elongation of the base sheet, the long fibers have no flexibility, and thus have poor dust catching and holding properties. In particular, the elongation at low stress in the fiber direction of the long fiber aggregate is preferably at least three times that of the base sheet.

When the fiber has a crimp, the entire elongation is caused by the elongation of the crimp, and the degree of freedom of the fiber is greatly improved by the extensibility. In addition, by having crimps, the long fibers can expand and contract in the fiber direction between the joining lines. Therefore,
The fiber is also easy to move in the direction perpendicular to the fiber direction, and the area where a certain point on the fiber can move becomes large. That is, even if the apparent lengths within the fixed interval are the same, the crimped fibers have a substantial length that is longer, and the moving distance is correspondingly longer. The number of crimps is preferably 5 to 25 peaks / inch (2.54 cm). When the number of crimps is less than 5 ridges / inch, the effect of crimping is not obtained so much and the degree of elongation is inferior. .

It is preferable to use long fibers having a denier of 2 to 30 denier. When the denier number is less than 2, the fiber strength is low and the bending strength is low, which is not preferable as a cleaning sheet. On the other hand, if it exceeds 30 denier, the rigidity of the fiber is high, and the cleaning effect utilizing the bending of the fiber, such as entanglement, is reduced, resulting in inferior relative quality.

In the long fiber assembly, there is no constraint in the direction perpendicular to the flow direction of the fibers, so that all fibers must have a joint at any position in the flow direction. . This is because fibers having no bonding points may fall off from the base sheet. Therefore, it is preferable that the joining is performed not by the joining point but by a linear joining line. When trying to join by points,
It is necessary to increase the number of joining points or increase the number of points, which deprives the fiber of freedom, which is not preferable. Furthermore, if the joining line is a line extending in a direction intersecting with the flow direction of the fibers, the long fiber aggregate can be joined efficiently.

The interval between the joining lines 4 is preferably about 5 to 60 mm. If it is less than 5 mm, the degree of freedom of the fibers is insufficient, and a sufficient effect cannot be obtained in the ability to capture large dust and the ability to wipe off dust on the uneven portion. Also, 60
If it exceeds mm, the fibers will lie down and it will not be possible to sufficiently fulfill functions such as the ability to capture and retain dust, which is not preferable. The interval between the joining lines 5 may be substantially constant as shown in these figures, or may be longer or shorter. Joining line 4
Is not particularly limited as long as it extends in a direction intersecting with the flow direction of the long fiber aggregate, and may have a shape other than those shown in FIGS.

For the joining, it is preferable to use welding means such as a heat welding seal or an ultrasonic welding seal, and particularly, a heat welding seal is preferable. Further, the fibers can be fixed by an adhesive, sewing, or the like.

As shown in FIG. 3, the long fiber aggregate 3 may be cut between the joining lines 4 to have a brush.
In that case, the length of the brush is preferably about 3 to 30 mm. Also, this length may be constant,
It can be long or short. Further, these brushes may be used by raising the brush, but may be used without raising the brush. For example, after cutting between the joining lines 4, only one may be raised and the other may be used without raising.

The base sheet 1 of the cleaning sheet of the present invention comprises:
Although not particularly limited, in the case of a floor cleaning sheet using a tool such as a mop, the length in the flow direction of the long fiber aggregate is approximately 25 to 80 cm, and the length in the lateral direction is approximately 20 to
It is preferably 30 cm.

The substrate sheet 2 used for the cleaning sheet 1 of the present invention is not particularly limited, but any material having a strength that can be used, such as a nonwoven fabric, a resin film, or a cloth containing synthetic fibers, can be used. Such a thing can also be used.
Among them, a spunbonded nonwoven fabric made of a composite fiber of polyethylene and polyester is preferable in terms of strength.

The long fiber aggregate 3 used for manufacturing the cleaning sheet 1 of the present invention is not particularly limited, but may be polyethylene, polypropylene, nylon, polyester, or the like.
A long fiber bundle generally called a tow manufactured from rayon or the like is used. Among them, it is preferable to use a fiber composed of a composite fiber of polyethylene and polyester.

In the cleaning sheet 1 of the present invention, the long fiber aggregate 3 is spread, expanded to a width of about 100 mm to 200 mm, and then joined to the base sheet 2. The joining is performed by joining the long fiber aggregate 3 to the base sheet 2 by a welding line 4 extending in a direction crossing the flow direction of the fibers of the long fiber aggregate 3 by welding or other methods. be able to. If necessary, the long fiber aggregate 3 is cut between the joining lines 4 of the obtained cleaning sheet to form a brush.

In the cleaning sheet 1 according to the present invention, when the long fiber aggregate 3 has crimps, raising the fibers naturally occurs only by cutting, without providing a step of raising fluff. However, the raising may be further fluffed by various fluffing steps. In this case, a method of blowing air from the air nozzle to the cleaning sheet, a method of applying a mechanical force to the cleaning sheet, or the like can be used. By making the brush fluff in this way, the dust collecting effect can be enhanced and the aesthetic appearance can be improved.

The cleaning sheet 1 of the present invention is used to improve the ability to capture and retain dust and to improve the finish of the cleaning surface after wiping, such as mineral oil such as paraffin, synthetic oil of polyolefin, and oil such as silicone oil. And a surfactant or the like. Such oils are spray applied,
It can be contained by a method such as transfer coating or impregnation.

The long fiber aggregate may be provided on the entire base sheet 2, but as shown in FIGS.
A region 9 without a brush may be provided at both ends of the base sheet 1 in a longitudinal direction or a direction perpendicular to the longitudinal direction. If there is an area 9 where no brush portion is provided, see Japanese Unexamined Patent Application Publication No.
As shown in FIG.
, The cleaning sheet 1 of the present invention can be easily attached to a mop handle or the like. In order to improve the strength of the area 9, the base sheet 9 can be folded back to be doubled, or another sheet can be overlapped and bonded. Although not shown, a notch or the like may be provided in the area 9 to make it easier to attach and detach the mop to a handle or the like.

[0022]

The present invention will be described more specifically with reference to the following examples. (Example 1) A tow of a long fiber aggregate having a crimp of 15 ridges / inch and a core-sheath structure of polyethylene and polyester (denier per filament is 3 deniers, total 75,000 deniers) After being expanded to a width of about 130 mm, it was joined to a spunbonded nonwoven fabric made of polyethylene and polyester (weighing 20 g / m ² , 210 mm width). Joining is performed by heat welding, and extends 20 mm in a direction crossing the fiber direction of the long fiber aggregate.
Were welded by welding lines at regular intervals. In addition, as a dusting aid, a dusting oil containing liquid paraffin as a main component,
5% by weight was applied to the cleaning sheet.

Example 2 A cleaning sheet was manufactured in the same manner as in Example 1 except that the interval between the welding wires was 10 mm.

(Example 3) A cleaning sheet was manufactured in the same manner as in Example 1 except that the long fiber aggregates were laminated and stretched by about 10% before joining, and welding was performed. did.

Example 4 A cleaning sheet was manufactured in the same manner as in Example 1 except that a long fiber aggregate having no crimp was used.

(Comparative Example 1) A spunbonded nonwoven fabric of polyethylene and polyester similar to that of Example 1 was laminated using a coarse air-through nonwoven fabric (weighing 25 g / m ² ) composed of staples of polyethylene and polyester.
Bonding was performed by the same welding wire as in Example 1, and the same dusting oil as in Example 1 was applied to manufacture a cleaning sheet.

(Test Example 1) The elongation of the long fiber aggregate and the base sheet for each cleaning sheet produced in Examples 1 to 4 and Comparative Example 1, their elongation ratios, dust wiping properties, and bread crumbs The wiping properties, hair wiping properties and dust retention properties were evaluated based on the following evaluation methods.

(Elongation) After cutting a sample having a width of 25 mm in the same direction as the fiber orientation, the sample was gripped at a chuck interval of 100 mm by a tensile tester, and pulled at a rate of 100 mm / min in the same direction as the fiber orientation. , And the number of displacements at the point where a load of 100 gf was applied was recorded as the elongation under a load of 100 gf. The elongation of both the long fiber aggregate and the base sheet were determined.

(Elongation ratio) From the elongation obtained above, the elongation of the long fiber aggregate / the elongation of the base sheet was calculated and defined as the elongation ratio.

(Dust Wiping Ability) As dust for evaluation, 1.5 g of JIS test dust (Kanto loam, fine granules) was sprayed on a test flooring, and the laminated sheet was attached to a cleaning holder and wiped off. The evaluation was performed based on the following four-level evaluation criteria. ◎: Very good wiping property was shown. ：: Excellent wiping property was shown. Δ: The amount that can be wiped is small, but it can be used. ×: hardly wiped off, lacking practicality

(Bread crumb wiping property) As a crumb for evaluation, 0.5 g of commercially available bread crumbs (1-2 mm) was sprayed on a test flooring, and the laminated sheet was attached to a cleaning holder and wiped off. The evaluation was performed using the above-described four-grade evaluation criteria of the dust wiping property.

(Wipeability of Hair) As hair for evaluation, 10 test human hairs (15 to 20 cm) were sprinkled on a test floor, and the laminated sheet was attached to a cleaning holder and wiped off. The evaluation was performed using four-step evaluation criteria.

(Dust Retention) After wiping off the three kinds of test dust shown in the wiping test method, the sheet was lightly shaken to shake off the dust, and the state of the dropped dust and the dust remaining on the sheet was observed. The evaluation was performed using the evaluation criteria in the following three stages. ：: Almost remained on the sheet, showing excellent retention. Δ: There is some dust that falls, but it can be used. X: A considerable amount was shaken off and lacked practicality. Table 1 shows the results of these evaluations.

[0034]

Table 1----------------------------------------------------------------------------------Example --------------------------------------------------------- 12 3 4 1 ------------------------------------------------------------------------- Tow elongation (%) 11.3 6.7 4.7 1.3 1.8 Base elongation (%) 1.3 1.3 1.3 1.3 1.3 Tow / base 8.7 5.2 3.5 1.0 1.4 −−−−−−−−−−−−−−−−−−− −−−−−−−−−−−− Dust wiping property ○ ○ ○ △ △ Bread dust wiping property ◎ ○ ○ × × Hair wiping property ◎ ○ ○ △ △ Dust retention property ○ ○ ○ × △ −−− −−−−−−−−−−−−−−−−−−−−−−−−−−−−

As is clear from the results shown in Table 1,
In the cleaning sheets of Examples 1 to 4, excellent or good results were obtained in all items. However, in Example 4 where the number of crimps was small, the result was slightly inferior. In Comparative Example 1 in which the long fiber aggregate was not used and Comparative Example 2 in which the elongation of the base sheet was smaller than that of the long fiber aggregate, the evaluation results were inferior.

[0036]

According to the present invention, there is provided a cleaning sheet having various shapes and sizes and excellent in the ability to capture and retain dust.

[Brief description of the drawings]

FIG. 1 is a plan view showing a cleaning sheet of the present invention.

FIG. 2 is a plan view showing a cleaning sheet of the present invention.

FIG. 3 is a plan view showing a cleaning sheet of the present invention.

4 is a partial cross-sectional view of the cleaning sheet of FIG. 1 along A-A '.

FIG. 5 is a schematic view for explaining movement of long fibers in the cleaning sheet of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning sheet 2 Base sheet 3 Long fiber aggregate 4 Joining line 9 Area

Continued on the front page (72) Inventor Masatoshi Fujiwara 1531-7 Wadahama Takasuka, Toyohama-cho, Mitoyo-gun, Kagawa Prefecture F-term in Unicharm Corporation Technical Center (Reference) CA05 CA07 CA19 CB01 CB07 CB10 CC16

Claims (5)

[Claims] 1. A long fiber aggregate (Tow) which is spread and arranged in parallel on at least one surface of a base sheet.
Wherein the elongation at low stress in the fiber direction of the long fiber aggregate is equal to or greater than the elongation of the base sheet in the same direction. 2. The 100 in the fiber direction of the long fiber aggregate.
The cleaning sheet according to claim 1, wherein the elongation under a load of gf / 25mm is at least three times the elongation under a load of 100gf / 25mm in the same direction of the base sheet. 3. The cleaning sheet according to claim 2, wherein the maximum tensile strength in the fiber direction of the long fiber aggregate is 5 kg / 25 mm or more. 4. The cleaning sheet according to claim 1, wherein the elongation of the long fiber aggregate is expressed by crimping of the fiber. 5. The cleaning sheet according to claim 1, further comprising an oil agent.