JP2005074133A - Cleaning sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning sheet in which the performance of wiping off dust or the like is excellent, the effect of wiping off moisture spilt on a floor surface or the like is also excellent and the effect of wiping off the dust or the like is not lowered even after wiping off the moisture. <P>SOLUTION: The cleaning sheet of this invention is composed of at least an intermediate layer mainly composed of hydrophilic fibers, and an upper surface layer and a lower surface layer containing hydrophobic fibers respectively laminated on both surfaces of the intermediate layer. At least one of the upper surface layer and the lower surface layer contains 5 mass % or more of acrylic fibers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cleaning sheet, and in particular, relates to a cleaning sheet having good wiping performance for dust and the like and excellent moisture absorption performance.

  2. Description of the Related Art Conventionally, in general houses, a cleaning sheet has been used to remove floor dirt and wipe off fine dust such as dust and hair on the shelf surface. The cleaning sheet is used by being detachably mounted on the sheet mounting portion that is swingably mounted on the tip of the rod-shaped handle, or is used as a wipe by holding it directly by hand. It is.

  Further, as described above, the cleaning sheet is used for cleaning dust, hair, and the like, but a sheet that can be used effectively for wiping water or spilled water has been developed. . For example, JP 2001-190469 A (Patent Document 1) discloses an ultrafine fiber containing 50% or more of split-type composite fibers on at least one surface of a hydrophilic fiber layer containing 50% by weight or more of hydrophilic fibers. A composite nonwoven fabric in which layers are arranged and integrated by three-dimensional entanglement is disclosed. This publication discloses that the composite nonwoven fabric can be used in either a wet state or a dry state.

Further, in JP-A-9-276193 (Patent Document 2), a web made of hydrophilic fibers or a fiber web made of synthetic fibers is laminated on one side or both sides of a water-absorbent sheet, and both layers are in an entangled state. An integrated cleaning sheet is disclosed. This publication discloses that this cleaning sheet is excellent in dust removal performance in wiping and cleaning, and is also effective for wiping water.

  Japanese Patent Application Laid-Open No. 11-267079 (Patent Document 3) is a sheet having a multilayer structure of at least two layers, in which a layer having a plurality of apertures and a layer having no apertures are stacked. A sheet is disclosed. This publication discloses that this sheet can be used for both dry wiping and water wiping.

  The cleaning sheets and the like disclosed in the above Patent Publications 1 to 3 are excellent in performance of wiping off dust and the like to some extent and can absorb water. Moreover, although what was disclosed by the said patent documents 1-3 can absorb water | moisture content by providing the layer which has a water absorption capability certainly, it wipes off dust, such as dust after wiping off water | moisture content. There was a problem that the performance was lowered.

  Also, with regard to wiping moisture, although depending on the amount of moisture, moisture may not be completely absorbed by one wiping, and water lines may be formed by wiping on the floor surface, etc. There was also a problem that the ability to wipe off moisture was low.

JP 2001-190469 A Japanese Patent Laid-Open No. 9-276193 Japanese Patent Laid-Open No. 11-267079

  Accordingly, an object of the present invention is to provide a cleaning sheet that has good wiping performance for dust, etc., is excellent in the effect of wiping off moisture spilled on the floor surface, etc., and does not deteriorate the wiping effect of dust after wiping off moisture. It is to provide.

As a result of intensive studies to achieve the above object, the present inventors have at least an intermediate layer mainly composed of hydrophilic fibers, and an upper surface layer and a lower surface layer including hydrophobic fibers respectively laminated on both surfaces of the intermediate layer. In the cleaning sheet comprising the above, the inventors have obtained the knowledge that the above object can be achieved by including a specific fiber in at least one of the upper surface layer and the lower surface layer, thereby completing the present invention.
The present invention has been made based on the above findings, and comprises at least an intermediate layer mainly composed of hydrophilic fibers, and an upper surface layer and a lower surface layer including hydrophobic fibers respectively laminated on both surfaces of the intermediate layer. The present invention provides a cleaning sheet, wherein at least one of the upper surface layer and the lower surface layer contains 5% by mass or more of acrylic fiber.
The cleaning sheet has a good wiping performance for dust and the like, is excellent in the effect of wiping off moisture spilled on the floor surface, etc., and does not deteriorate the wiping effect for dust and the like even after the moisture is wiped off.

The fineness of the acrylic fiber is preferably 2 dtex or less.
The intermediate layer is preferably a layer made of hydrophilic fibers containing at least pulp.
The intermediate layer, the upper surface layer, and the lower surface layer are preferably integrally processed by entanglement by needle punching or spunlace method.

  The cleaning sheet of the present invention has good wiping performance for dust and the like, is excellent in the effect of wiping off moisture spilled on the floor surface, etc., and does not deteriorate the wiping effect for dust and the like after wiping off moisture.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. FIG. 1 shows a schematic diagram of a cross-sectional structure in an embodiment of the cleaning sheet of the present invention.

  A cleaning sheet 1 according to the embodiment shown in FIG. 1 includes an intermediate layer 2 and an upper surface layer 3 and a lower surface layer 4 laminated on both surfaces of the intermediate layer 2. The intermediate layer 2 is a layer mainly composed of hydrophilic fibers, preferably contains 80% by mass or more of hydrophilic fibers, more preferably 90% by mass or more, and most preferably consists of only hydrophilic fibers. .

  The intermediate layer 2 is a layer that functions as a water absorbing layer and a water retaining layer, and natural fibers such as cotton or pulp, regenerated fibers such as rayon and cupra, and the like can be used. Among these fibers, it is preferable to use pulp fibers, and it is preferable to mainly use pulp fibers. Moreover, it is most preferable to set it as the layer which makes a pulp fiber 100%. The intermediate layer 2 is preferably not a cotton-like (fluff pulp) but a sheet-like one having a high density, from the viewpoint of improving the water absorption rate and water retention.

Examples of the pulp fibers include ordinary pulp fibers, such as soft pulp or hardwood chemical pulp (craft pulp), semi-chemical pulp, semi-chemical pulp, mechanical pulp, etc. Crimp pulp or the like modified with a crosslinking agent can be used. In addition, softwood pulp is preferably used in terms of function and price. The basis weight of the intermediate layer 2 is preferably set to 20 to 40 g / m ^2, and more preferably be 25 to 35 g / m ^2. If the basis weight is less than 20 g / m ² , the water absorption capacity, particularly the water retention performance, may decrease. On the other hand, if the basis weight exceeds 40 g / m ² , the water absorption capacity becomes excessive and the thickness of the cleaning sheet increases. , It may become too bulky. The fibers used for the mid layer 2 may be short fibers or long fibers.

  The upper surface layer 3 and the lower surface layer 4 are layers containing hydrophobic fibers. The upper surface layer 3 and the lower surface layer 4 contain at least 20% by mass or more, preferably 30% by mass or more, and most preferably 60% by mass or more hydrophobic fibers. It is preferable that the upper surface layer 3 and the lower surface layer 4 contain hydrophobic fibers, since a certain degree of water repellency can be provided.

  Examples of hydrophobic fibers include polyolefin fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polypropylene / polyethylene, polyethylene terephthalate-ethylene Core-sheath type composite fiber or eccentric core-sheath type composite fiber in which the sheath part made of propylene copolymer, low melting point polyester-polyester or the like has a relatively low melting point, or polyethylene terephthalate / polypropylene, polyethylene terephthalate / nylon, polypropylene / Split-type composite fiber with a part of each component made of polyethylene exposed on the surface or polyethylene terephthalate DOO / ethylene - by thermal contraction of one component made of propylene copolymer may be used heat splittable conjugate fibers to split. Although there is no restriction | limiting in particular in the fineness of a hydrophobic fiber, For example, it is preferable to set it as 0.1-5.0 dtex. The hydrophobic fiber may be a short fiber or a long fiber. Of the hydrophobic fibers, polyester fibers are preferably used. By using polyester fiber, the stiffness is improved and a bulky cleaning sheet can be obtained.

Further, either one of the upper surface layer 3 and the lower surface layer 4 contains 5% by mass or more of acrylic fiber, and preferably contains 10% by mass or more. By containing 5% by mass or more of the acrylic fiber, moisture that does not reach the intermediate layer 2 when the liquid such as spilled water is wiped can be absorbed and retained in the fiber. The cleaning sheet of the present invention contains 5 mass% or more of acrylic fiber in either one of the upper surface layer 3 and the lower surface layer 4, but contains 5 mass% or more of acrylic fiber in both the upper surface layer 3 and the lower surface layer 4. It is preferable.
Further, the fineness of the acrylic fiber is preferably 5 dtex or less, and more preferably 2 dtex or less. If the fineness of the acrylic fiber exceeds 5 dtex, the cleaning fiber itself may become hard because the acrylic fiber is a hard fiber. In addition, the fiber itself may not be flexible, and the dust removal performance may be reduced.

The basis weights of the upper surface layer 3 and the lower surface layer 4 are each preferably 10 to 80 g / m ² , and more preferably 15 to 25 g / m ² . If the basis weight is less than 10 g / m ² , the layer thickness for wiping off dust and hair may be substantially too thin to obtain the desired wiping performance, whereas it exceeds 80 g / m ² . When the moisture is wiped off, the moisture becomes difficult to reach the intermediate layer 2 and is retained in the hydrophilic fibers of the upper surface layer 3 and the lower surface layer 4, which is not preferable.
Moreover, the thickness of the upper surface layer 3 and the lower surface layer 4 becomes like this. Preferably it is 0.2-3 mm, More preferably, it is 0.5-2 mm. The thicknesses of the upper surface layer 3 and the lower surface layer 4 may be the same or different. Further, the compositions of the upper surface layer 3 and the lower surface layer 4 may be the same or different.

  The cleaning sheet 1 of the present invention comprises an intermediate layer 2 and an upper surface layer 3 and a lower surface layer 4 laminated on both surfaces of the intermediate layer 2, respectively. For example, the intermediate layer 2, the upper surface layer 3 and the lower surface layer 4 are: Each layer is integrated by entanglement by a needle punch or spunlace method. The production method based on the spunlace method will be described in detail. It is preferable that the intermediate layer 2, the upper surface layer 3, and the lower surface layer 4 are joined together by entanglement of fibers by high-pressure water flow projection to form a sheet. By the high-pressure jetted water stream, the pulp layer of the intermediate layer 2 becomes a medium layer for bonding the front and back surfaces, and the upper surface layer 3 and the lower surface layer 4 on the front and back surfaces can be bonded together.

  When bonding the layers of the cleaning sheet, heat-fusible fibers such as polyethylene and polypropylene are mixed in the fibers, and the fibers are entangled three-dimensionally with a high-pressure water stream, and then heat is applied to heat the fibers. There is also a method of strengthening the bonding of each layer by fusing the fusible fiber, but in the case of the cleaning sheet of the present invention, if such a method is adopted, the sheet becomes too hard, In addition, since the heat fusion part inhibits moisture permeation, it is preferable not to perform heat fusion between the fibers.

  Moreover, an unevenness | corrugation can be formed in the surface layer of the sheet | seat for cleaning of this invention, and a pattern can also be formed. In this case, the upper surface layer 3, the intermediate layer 2, and the lower surface layer 4 are laminated in this order on the wire mesh forming the surface pattern on the line, and a high-pressure water stream is jetted from above the fiber web during conveyance. So that the fibers are entangled.

  In the above description, the cleaning sheet of the present invention is manufactured by a spunlace method using a high-pressure water flow. For example, the layers are bonded by a needle punch method in which fibers are entangled by inserting and removing hook-shaped needles. Also good.

  In the above description, the cleaning sheet of the present invention is composed of the intermediate layer 2, the upper surface layer 3 and the lower surface layer 4, but between the intermediate layer 2 and the upper surface 3, the intermediate layer 2 and the lower surface layer 4. Another layer may be provided between the layers.

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited thereto. In this example, the cleaning sheet was evaluated by the following method.
(1) Test 1
A cleaning sheet is attached to a cleaning jig with a handle, 10 hairs and dust are sprinkled on the floor, and a cleaning jig with a cleaning sheet is reciprocated over the hair and dust for 5 hairs. It was confirmed visually. Evaluation was performed according to the following evaluation criteria.
A: The number of taken hairs was 7 or more.
○: The number of hairs taken was 4-6.
(Triangle | delta): The number of the taken-off hair was 1-3.
X: The number of hairs taken was zero.

(2) Test 2
A cleaning sheet is attached to a cleaning jig with a handle, 10 hairs and dust are sprinkled on the floor, and the cleaning jig with the cleaning sheet is moved back and forth over the hair and dust to clean the hair and dust. After being attached to the sheet, it was shaken five times with the handle of the device jig, and it was visually confirmed how many hairs had fallen. Evaluation was performed according to the following evaluation criteria.
A: The hair did not fall off at all.
○: The number of hairs dropped was 1 to 3.
Δ: The number of hairs dropped was 4-6.
X: The number of hairs that fell was 7 to 10.

(3) Test 3
A cleaning sheet is attached to a cleaning jig with a handle, 20 grains of small dust (sand grains) are sprinkled on the floor, and the cleaning jig with the cleaning sheet is reciprocated 10 times over the garbage, It was confirmed by visual inspection whether or not it was picked up. Evaluation was performed according to the following evaluation criteria.
A: The number of collected garbage was 15 or more.
○: The number of collected garbage was 10-14.
(Triangle | delta): The number of the collected garbage was 5-9 pieces.
X: The number of collected garbage was 4 or less.

(4) Test 4
A cleaning sheet was attached to a cleaning jig with a handle, and floor cleaning was performed on 10 panelists using the cleaning jig on which the cleaning sheet was attached. Evaluation was performed according to the following evaluation criteria.
A: Garbage was removed very well.
○: Garbage was removed.
Δ: Not much trash was removed.
X: No garbage was collected.

(5) Test 5
A cleaning sheet was attached to a cleaning jig with a handle, and 10 ml of water was absorbed into the cleaning sheet. Sprinkle 25 hairs and dust on the floor, reciprocate the cleaning jig with the water-absorbing cleaning sheet 5 times over the hair and dust, visually check how many hairs have been removed, and then repair the equipment. Holding the handle of the tool, it was shaken 5 times and it was visually confirmed how many hairs had fallen. Evaluation was performed according to the following evaluation criteria.
A: The number of hairs taken was 20 or more, and the hair did not fall even when the cleaning jig was shaken.
○: The number of hairs taken was 20 or more, and when the cleaning jig was shaken, the hair fell.
(Triangle | delta): The number of the taken-off hair was 10-19.
X: The number of hair taken was 0-9, or the number of hair taken was 10-19, and when the cleaning jig was shaken, the hair fell.

Example 1
Pulp (kraft pulp) is used as the fibers constituting the intermediate layer, and rayon / polyethylene terephthalate / acrylic fibers (fiber length: 50 mm, fineness: 0.9 dtex) (7: 2: 1) are used as the upper layer and the lower layer, The cleaning sheet shown in FIG. 1 was produced by the spunlace method. In addition, the thickness of the sheet | seat for cleaning was produced so that it might be set to 0.5 mm. Moreover, the basic weight of the intermediate | middle layer was 23 g / m < ² >, and the basic weight of the upper surface layer and the lower surface layer was 21 g / m < ² >.
The above-described evaluation was performed on the obtained cleaning sheet. The evaluation results are shown in Table 1.

Comparative Example 1
Implemented except that rayon / polyethylene terephthalate (7: 3) was used as the top layer and bottom layer, the basis weight of the top layer and bottom layer was 18 g / m ² and the basis weight of the intermediate layer was 27 g / m ^2. The same operation as in Example 1 was performed to prepare a cleaning sheet. The obtained cleaning sheet was evaluated in the same manner as in Example 1. The evaluation results are shown in Table 1.

  As is clear from Table 1, the cleaning sheet of the present invention has good wiping performance for dust and the like.

It is a perspective view in an embodiment of a cleaning sheet of the present invention.

Explanation of symbols

1 Cleaning sheet 2 Intermediate layer 3 Upper surface layer 4 Lower surface layer

Claims (4)

At least an intermediate layer mainly composed of hydrophilic fibers, and an upper surface layer and a lower surface layer containing hydrophobic fibers respectively laminated on both surfaces of the intermediate layer,
A cleaning sheet, wherein at least one of the upper surface layer and the lower surface layer contains 5% by mass or more of acrylic fiber. The cleaning sheet according to claim 1, wherein the fineness of the acrylic fiber is 2 dtex or less. The cleaning sheet according to claim 1 or 2, wherein the intermediate layer is a layer made of hydrophilic fibers containing at least pulp. The cleaning sheet according to any one of claims 1 to 3, wherein the intermediate layer, the upper surface layer, and the lower surface layer are integrally processed by entanglement by a needle punch or a spunlace method.

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