TW202207861A - Cleaning sheet including a water-retaining layer (3) and a surface layer (2) - Google Patents

Abstract

The present invention provides a cleaning sheet which has excellent soil removal performance and moisture release properties, and which can sustainably exert its excellent soil removal performance. The cleaning sheet (1) of the present invention comprises a water-retaining layer (3) and a surface layer (2). The surface layer is laminated on at least one side of the water-retaining layer (3) to form a wiping surface. The surface layer (2) includes, at least on the wiping surface, a plurality of openings (50) passing through the surface layer (2) in the thickness direction, and a plurality of non-openings (53) other than the openings (50). The water-retaining layer (3) and the surface layer (2) are partially bonded.

Description

cleaning sheet

The present invention relates to a disposable cleaning sheet for wiping off dust and garbage from objects to be cleaned, such as floors, furniture, and household appliances.

As a cleaning tool for cleaning indoor floors, furniture, household appliances, etc., there is known a disposable cleaning sheet that can clean the cleaning object in a wet state (wet state).

In addition, various cleaning sheets have been proposed in recent years. For example, Patent Document 1 discloses a cleaning tool including a cleaning sheet attachment member and a cleaning sheet, wherein the central portion of the cleaning sheet has hydrophobicity The first sheet, the hydrophobic second sheet, the hydrophilic third sheet, and the fourth sheet.

In addition, Patent Document 2 discloses a cleaning wet sheet, which is a cleaning wet sheet including a fiber aggregate formed by interlacing a fiber web with water flow, wherein a mesh-like sheet is arranged inside the fiber aggregate, and the fibers are aggregated. At least one surface of the body has a plurality of convex portions formed by the intertwining of constituent fibers, and a concave portion surrounding the shape of the convex portion, and the static friction resistance value of the above-mentioned surface of the fiber aggregate is 900 to 2500 cN.

Furthermore, Patent Document 3 discloses a hydrolyzable wiping sheet having: a hydrolyzable surface sheet and a back sheet formed of water-dispersible fibers; and a hydrolyzable intermediate sheet disposed between these sheets The multi-structure hydrolyzable wiping sheet is provided with a plurality of openings penetrating the layers in the surface sheet and the back sheet, the openings are blocked by the intermediate sheet at the boundary portion with the intermediate sheet, and both sides of the sheet are blocked by the intermediate sheet. Make a wipe surface. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 5777325 [Patent Document 2] Japanese Patent Laid-Open No. 2011-224385 [Patent Document 3] Japanese Patent Laid-Open No. 2001-275875

[Problems to be Solved by Invention]

The cleaning sheet disclosed in Patent Document 1 has a structure of three or more layers using the first to fourth sheets as a water-retaining layer (inner layer) and a surface layer (outer layer), and has a structure in which the center portion is not joined. Those that can exhibit excellent water release properties may not be able to sufficiently remove dirt such as dust and garbage to be cleaned because the surface of the non-woven fabric forming the surface layer has a flat structure (hereinafter referred to as "dirt removal performance"). .) concerns. On the other hand, the cleaning wet sheet disclosed in Patent Document 2 is composed of a single layer of fiber aggregate (non-woven fabric), and furthermore, by arranging a mesh-like sheet inside the non-woven fabric, the strength of the non-woven fabric is high, and the It exhibits a certain soil removal performance, and since the non-woven fabric has a single-layer structure, there is still room for improvement in the point of so-called water release properties such as cleaning chemicals from non-woven fabrics (hereinafter simply referred to as "moisture release properties"). . Furthermore, the hydrolyzable wiping sheet disclosed in Patent Document 3 has a structure in which a large number of openings are provided in the surface sheet, and the boundary between the openings and the intermediate sheet is blocked by the intermediate sheet. On the other hand, it is easy to keep the dirt such as garbage and dust in the opening part, and can exert a certain strength and garbage collection ability (that is, the dirt removal performance), but once the dirt is kept in the opening part, because the dirt is like this If it continues to remain in the opening, there is a problem that the dirt to be cleaned cannot be removed any more, that is, there is a problem that the dirt removal performance cannot be continuously exhibited.

Herein, the present invention provides a cleaning sheet which has excellent soil removal performance and moisture release properties, and which can sustainably exert the excellent soil removal performance. [Technical means to solve problems]

One aspect (aspect 1) of the present invention is a cleaning sheet comprising a water-retaining layer and a surface layer laminated on at least one side of the water-retaining layer to form a wiping surface, and the cleaning sheet is characterized by its characteristics for: The surface layer has, at least on the wiping surface, a plurality of openings penetrating the surface layer in the thickness direction, and non-openings other than the openings, The water-retaining layer and the surface layer are partially bonded.

The cleaning sheet according to the first aspect has a plurality of openings on at least the wiping surface of the surface layer, and the level difference of the edges of the openings can be used to scrape off dirt such as garbage and dust when the object to be cleaned is wiped. Provides excellent dirt removal performance. In addition, in the cleaning sheet of this aspect 1, at least the wiping surface of the surface layer can be held by a non-opening part other than the above-mentioned plural openings, such as existing between adjacent openings, etc. The cleaning chemicals in the surface layer and the water-retaining layer are moderately released to the cleaning object, and can exhibit excellent water release properties. In addition, in the cleaning sheet of this sample 1, by partially bonding the water-retaining layer and the surface layer, the surface layer can be easily moved in a relatively offset manner with respect to the water-retaining layer, so even if the cleaning sheet is held in the opening The scraped dirt is moved by the water-retaining layer and the surface layer in a relatively staggered manner during the wiping operation, and the dirt in the opening is captured in the water-retaining layer or the boundary between the water-retaining layer and the surface layer. It is formed by the surface of the water-retaining layer newly exposed to the bottom surface of the opening. In this way, the cleaning sheet of the present Example 1 can continue to exhibit the above-mentioned excellent stain removal performance.

Moreover, in another aspect (aspect 2) of the present invention, in the cleaning sheet of the above aspect 1, the cleaning sheet has a first direction and a second direction orthogonal to each other, The water-retaining layer and the surface layer are joined to both end regions in the second direction.

The cleaning sheet of the second aspect is formed in the center of the second direction while maintaining the structure of the cleaning sheet, since the water retaining layer and the surface layer are joined to both end regions in the second direction (for example, the width direction). In the partial region, the surface layer is relatively staggered and easily moved in the second direction (ideally, the direction corresponding to the wiping direction during cleaning) with respect to the water-retaining layer. Thereby, the cleaning sheet of this aspect 2 can exhibit the above-mentioned excellent stain removal performance more consistently and reliably when the second direction is used as the wiping direction during cleaning.

In yet another aspect (Aspect 3) of the present invention, in the cleaning sheet of the above-mentioned aspect 1 or 2, the opening area ratio of the plurality of openings is in the range of 4% to 60%.

The cleaning sheet of the third example has the opening area ratio of the plurality of openings of 4% or more, and can scrape off more than a predetermined amount of dirt by utilizing the step difference of the edges of the openings, and can more reliably exhibit excellent dirt removal. performance. In addition, since the opening area ratio of the plurality of openings is 60% or less, the cleaning sheet of this sample 3 can more reliably exhibit excellent moisture release properties while securing a predetermined rigidity as the cleaning sheet.

In still another aspect (Aspect 4) of the present invention, in the cleaning sheet of the above-mentioned aspects 1 to 3, the cleaning sheet has a first direction and a second direction orthogonal to each other, The surface layer on the wiping surface has a different opening shape of the plurality of openings located in the center region in the second direction from the opening shapes of the plurality of openings located in both end regions in the second direction.

The cleaning sheet of this aspect 4 has the opening shape of the plurality of openings located in the central region in the second direction (for example, the width direction) and the plurality of openings located in both end regions in the second direction on the wiping surface. The shape of the opening is different, and dirt such as garbage and dust can be captured according to its shape and size. Especially, when the second direction is used as the wiping direction during cleaning, it can exert more excellent dirt removal performance.

In still another aspect (aspect 5) of the present invention, in the cleaning sheet according to any one of the above aspects 1 to 4, the surface layer is formed of a fiber sheet, and the non-opening portion has the structure of the fiber sheet The fibers form raised raised portions.

The cleaning sheet of this sample 5 has a raised portion in the non-opening portion of the surface layer, and the dirt such as garbage and dust to be cleaned can be captured by the entanglement of the raised fibers of the raised portion, and further excellent dirt can be exhibited. Remove performance.

In yet another aspect (aspect 6) of the present invention, in the cleaning sheet according to the aspect 5, the raised fibers of the raised portion have hydrophobicity.

The cleaning sheet of this sample 6 has hydrophobicity in the fluffed fibers. Therefore, the cleaning object can be wiped off even with a relatively weak force, and the fibers are not easily collapsed even when the cleaning sheet is wet. , the above-mentioned excellent dirt removal performance can be exerted more reliably.

In yet another aspect (aspect 7) of the present invention, in the cleaning sheet according to any one of the above aspects 1 to 6, the surface layer of the surface layer which forms the wiping surface has a static friction coefficient in the range of 0.20 to 0.40 .

The cleaning sheet of the present Example 7 has a static friction coefficient of 0.20 or more on the surface of the wiping surface forming the surface layer, so that dirt such as garbage and dust to be cleaned can be reliably wiped off. In addition, since the cleaning sheet of this aspect 7 has a static friction coefficient of 0.40 or less on the surface of the wiping surface forming the surface layer, the cleaning object can be wiped off even with a relatively weak force.

In still another aspect (Aspect 8) of the present invention, in the cleaning sheet of any of the above-mentioned aspects 1 to 7, the surface layer is laminated on both surfaces of the water-retaining layer.

In the cleaning sheet of this example 8, since the surface layers are laminated on both sides of the water-retaining layer, both sides of the cleaning sheet can be used as wiping surfaces, and cleaning can be performed more efficiently.

In yet another aspect (aspect 9) of the present invention, in the cleaning sheet of any one of the above aspects 1 to 8, the surface layer has a first surface facing the water retaining layer, and a thickness direction of the first surface. , the second surface on the opposite side of the aforementioned first surface, The mixing ratio of the hydrophobic material on the second surface is higher than the mixing ratio of the hydrophobic material on the first surface.

In the cleaning sheet of this example 9, the mixing ratio of the hydrophobic material on the second surface of the surface layer (that is, the surface forming the wiping surface) is higher than the mixing ratio of the hydrophobic material on the first surface. The cleaning liquid released from the cleaning sheet can exhibit more excellent water release properties.

In yet another aspect (aspect 10) of the present invention, the cleaning sheet of any one of the above-mentioned aspects 1 to 9 is impregnated with a cleaning chemical solution.

Since the cleaning sheet of this aspect 10 is impregnated with the cleaning chemical solution, it is possible to perform efficient or functional cleaning according to the components of the cleaning chemical solution (for example, water, surfactant, alcohol, glycerin, etc.). (eg cleaning with a sterilizing effect).

In yet another aspect (Aspect 11) of the present invention, in the cleaning sheet of Aspect 10, the impregnation amount of the cleaning chemical solution in the water retaining layer is larger than the impregnation amount of the cleaning chemical solution in the surface layer.

In the cleaning sheet of the present Example 11, since the impregnation amount of the cleaning chemical solution for the water-retaining layer is larger than that for the surface layer, the water-retaining layer retains a relatively large amount of the cleaning chemical solution. Therefore, the cleaning sheet can be easily removed from the cleaning sheet. Continue to release cleaning solution, and can exhibit excellent water release properties more continuously.

In yet another aspect (aspect 12) of the present invention, in the cleaning sheet of the above aspect 10 or 11, the impregnation amount of the cleaning chemical solution for the water retaining layer is 1.5 times the impregnation amount of the cleaning chemical solution for the surface layer. ~2.5x.

In the cleaning sheet of this embodiment 12, since the impregnation amount of the cleaning chemical solution for the water-retaining layer is 1.5 to 2.5 times the impregnation amount of the cleaning chemical solution for the surface layer, an appropriate amount of the cleaning chemical can be continuously released from the cleaning sheet liquid, and can further exhibit excellent water release properties more continuously. [Effect of invention]

According to the present invention, there is provided a cleaning sheet which has excellent soil removal performance and water release property, and which exhibits the excellent soil removal performance in a sustainable manner.

Hereinafter, suitable embodiments of the cleaning sheet of the present invention will be described in detail with reference to the drawings.

[Cleaning Sheet] FIG. 1 is a plan view of the cleaning sheet 1 according to an embodiment of the present invention as viewed in the thickness direction _DT , FIG. 2 is an enlarged perspective view of the main parts of the cleaning sheet 1, and FIG. 3 is a It is an end view of the cutting surface along the line III-III of the cleaning sheet 1 in FIG. 1 . 4 is an enlarged cross-sectional view of a main part of the cleaning sheet 1 , and FIG. 5 is an explanatory diagram schematically showing an action mechanism of the cleaning sheet 1 .

The cleaning sheet 1 according to one embodiment of the present invention is a sheet-like fibrous structure, which has a function of cleaning the surface of the cleaning object by wiping off the dust and garbage of the cleaning object such as the floor, furniture, and household appliances, such as As shown in FIG. 1 , in plan view, it has a rectangular outer shape having a long first direction D ₁ and a short second direction D ₂ orthogonal to the first direction D ₁ . In addition, the external shape of the cleaning sheet 1 is not particularly limited, and arbitrary shapes (eg, rectangle, square, trapezoid, oval, etc.) corresponding to various applications and the like can be adopted.

As shown in FIGS. 1 to 3 , the cleaning sheet 1 includes a surface layer 2 , a water-retaining layer 3 , and a surface layer 4 as main constituent members, and the surface layer 2 is a wiping surface for forming an object for wiping and cleaning. The water-retaining layer 3 is layered on the wiping surface (second surface) and the opposite side (first surface) of the surface layer 2, and is impregnated with a cleaning chemical solution, and the surface layer 4 is layered on the surface layer 2. The surface opposite to the surface layer 2 of the water retention layer 3 forms a wiping surface opposite to the surface layer 2 . That is, the cleaning sheet 1 has a three-layer laminated structure in which the surface layer 2 on one side, the water retention layer 3, and the surface layer 4 on the other side are laminated in this order in the thickness direction _DT .

Then, in the cleaning sheet 1 of the present embodiment, as shown in FIGS. 1 to 3 , the surface layers 2 and 4 have, at least on the wiping surfaces, a plurality of openings penetrating the surface layers 2 and 4 in the thickness direction _DT 50, and the non-opening portion 53 other than the opening portion 50, and the water retaining layer 3 and the surface layers 2 and 4 in the end region A1 and the other side located on the one side in the _second direction D2 of the cleaning sheet _{1 The} junctions 61 and 62 of the respective regions of the side end region A2 are joined, and each of the ends 63 on the one side and the end 64 on the other side in the _second direction D2 is excluding The form of the water retaining layer 3 is joined, that is, the water retaining layer 3 and the surface layers 2 and 4 are partially joined.

The cleaning sheet 1 thus constituted has a plurality of openings 50 on at least the wiping surfaces of the surface layers 2 and 4, so that the level difference of the edges of the openings 50 can be used to scrape off garbage, dust, etc. when the cleaning object is wiped. dirt, and can exert excellent dirt removal performance. In addition, the cleaning sheet 1 is formed on at least the wiping surfaces of the surface layers 2 and 4, and the non-opening portions 53, which are parts other than the above-mentioned plural openings 50, such as between the adjacent openings 50, can be used for cleaning. The cleaning chemical held on the surface layers 2 and 4 and the water-retaining layer 3 is appropriately released to the cleaning object, and can exhibit excellent water release properties. Furthermore, in the cleaning sheet 1, since the surface layers 2 and 4 are easily moved in a relatively staggered manner with respect to the water-retaining layer 3 by partially bonding the water-retaining layer 3 and the surface layers 2 and 4, such as As shown in FIG. 5 , even if the scraped dirt D is held in the opening 50, the water-retaining layer 3 and the surface layer 2 are moved so as to be relatively displaced during the wiping operation (in addition, F2 in FIG. ₅ (a) and F ₃ represent the moving directions of the surface layer 2 and the water-retaining layer 3, respectively.), while capturing the dirt in the opening 50 into the water-retaining layer 3 or the boundary between the water-retaining layer 3 and the surface layer 2, it is possible to It is formed by the surface of the water retaining layer 3 newly exposed on the bottom surface of the opening 50 (see 5(b)). In this way, the cleaning sheet 1 can continue to exhibit the above-mentioned excellent dirt removal performance.

In addition, in this embodiment, by laminating the surface layers 2 and 4 on both surfaces of the water-retaining layer 3, both surfaces of the cleaning sheet 1 are formed as wiping surfaces. However, the present invention is not limited to such an aspect. Cleaning For the sheet, the surface layer may be laminated only on one surface of the water-retaining layer, and only one surface of the cleaning sheet may be formed as the wiping surface. However, as in the above-mentioned embodiment, if the surface layers are laminated on both sides of the water-retaining layer, both sides of the cleaning sheet can be used as wiping surfaces, and there is an advantage that cleaning can be performed more efficiently.

(Usage form) Although the use form of the cleaning sheet 1 is not particularly limited, the cleaning sheet 1 uses the entire surface of the surface layers 2 and 4 as the wiping surface, and the cleaning sheet 1 can also be used for cleaning objects such as rags and wiping cloths. For the wiping and sweeping, the central part A and _C , which is located in the center part of the surface layers ₂ and 4 in the second direction D2 and extends in the _first direction D1, is used as the wiping surface, and the _second direction D2 The end region A1 on _one side and the end region A2 _on the other side (ie, both end regions) serve as attachment parts to the holder, and the end regions are folded over and attached to the front end of the holder In this state, wiping cleaning for cleaning objects is also possible. In addition, when used in the form described later, the holder is not particularly limited. For example, it is provided with a grip portion that the user grasps by hand, and a grip portion located on the opposite side of the grip portion and holding the grip portion. A rod-shaped holder made of resin (for example, polypropylene, etc.) or metal (for example, aluminum, etc.) at the tip of the cleaning sheet. By.

Hereinafter, various members constituting the cleaning sheet of the present invention will be described in more detail using the cleaning sheet 1 of the above-described embodiment.

[water retention layer] In the above-mentioned cleaning sheet 1 , the water-retaining layer 3 is disposed between the surface layer 2 and the surface layer 4 , and is formed of a hydrophilic nonwoven fabric capable of holding the cleaning liquid of the cleaning sheet 1 . By forming the water-retaining layer 3 with the hydrophilic nonwoven fabric, the cleaning sheet 1 can appropriately release the cleaning chemical held in the water-retaining layer 3 to the cleaning target through the non-opening portions 53 of the surface layers 2 and 4 .

The hydrophilic nonwoven fabric forming the water retaining layer 3 is not particularly limited as long as it can hold the cleaning solution, and any hydrophilic nonwoven fabric can be used. Such a hydrophilic nonwoven fabric only needs to have hydrophilicity as a nonwoven fabric. Therefore, it may be a nonwoven fabric composed of only hydrophilic fibers, a nonwoven fabric composed of hydrophilic fibers and hydrophobic fibers, or a nonwoven fabric composed of only hydrophobic fibers. The non-woven fabric formed of sexual fibers is a non-woven fabric that has been hydrophilized.

There is no particular limitation on such hydrophilic nonwovens, for example, air-forming nonwovens, wet nonwovens, water needle nonwovens, spunbond nonwovens, meltblown nonwovens, thermally bonded nonwovens (such as hot air nonwovens, point-bonded nonwovens, etc.) etc.), chemically bonded non-woven fabrics, etc., but air-formed non-woven fabrics are ideal.

In addition, the fibers constituting the hydrophilic nonwoven fabric are not particularly limited as long as they do not inhibit the effects of the present invention, and examples thereof include cellulose-based fibers, synthetic fibers, and the like. These cellulosic fibers and synthetic fibers may be used alone, or both may be used in combination, and a binder (for example, EVA, SBR, etc.) may be used in combination. Cellulose-based fibers include, for example, natural cellulose-based fibers such as pulp, cotton, and hemp; regenerated cellulose-based fibers such as rayon, lyocell, cupro rayon, etc., and these fibers are also One type of fiber may be used alone, or two or more types of fibers may be used in combination. In addition, synthetic fibers include: polyolefin fibers such as polyethylene (PE) and polypropylene (PP); polyethylene terephthalate (PET), polypropylene terephthalate Polyester fibers such as polyvinyl alcohol (PTT); polyvinyl alcohol fibers such as vinylon; polypropylene fibers such as polyacrylonitrile; polyurethane (PU) fibers; polyamide fibers such as nylon, etc. Such fibers may be used alone, or two or more types of fibers may be used in combination. Furthermore, the form of the synthetic fiber is not particularly limited, and for example, PP (core)/PE (sheath), high-melting PP (core)/low-melting PP (sheath), and PET (core) can be used. Core-sheath type conjugated fibers such as /PE (sheath); side-by-side conjugated fibers; synthetic fibers of any form, such as flat, Y-shaped, C-shaped, and other irregular-shaped cross-section fibers. In addition, when the non-woven fabric is formed of only hydrophobic synthetic fibers, the synthetic fibers before forming the non-woven fabric are subjected to a hydrophilization treatment by a hydrophilization treatment agent or the like, or the non-woven fabric after formation is only subjected to a hydrophilic treatment by a hydrophilization treatment agent or the like. can be processed.

The thickness, basis weight, etc. of the hydrophilic nonwoven fabric that forms the water retaining layer 3 are not particularly limited as long as the effect of the present invention is not hindered. Although any thickness, basis weight, etc. can be adopted, it depends on the impregnation and release properties of the cleaning chemical solution. From the viewpoint of the output properties, the basis weight is preferably within the range of 15 g/m ² to 100 g/m ² , and more preferably within the range of 30 g/m ² to 80 g/m ² .

In the present invention, the water-retaining layer may be formed of any fibrous sheet (eg, woven cloth, knitted cloth, etc.) other than hydrophilic nonwoven fabric, or a resin sheet having water retention, as long as the water-retaining layer can hold the cleaning liquid.

In addition, in the above-mentioned cleaning sheet 1, as shown in FIGS. 1 to 3 , the water-retaining layer 3 is shorter than the surface layers 2 and 4 formed with the length in the second direction, and both ends in the second direction D ₂ and the surface Layers 2 and 4 are bonded. Specifically, as shown in FIGS. 1 to 3 , in the cleaning sheet 1 , the surface layer 2 is formed to have a shorter length in the second direction than the surface layer 4 , and both ends of the surface layer 2 in the second direction D ₂ are formed. _2. The portion overlapping with both ends in the second direction D2 of the water retaining layer ₃ in the thickness direction D _T , through the respective junctions ( That is, the junction part 61 on one side and the junction part 62 on the other side in the _second direction D2 in FIGS. 1 to 3 are joined. In addition, the surface layer 4 is located at both ends of the second direction D ₂ on the outer side of the above-mentioned joining portions 61 and 62 (that is, the ends on one side of the second direction D ₂ in FIGS. 1 to 3 ). 63 and the other end 64), folded toward the surface side on which the surface layer 2 and the water retention layer 3 are stacked, and joined the folded parts.

In addition, in the above-mentioned cleaning sheet 1, the joint portions 61 and 62 of the water-retaining layer 3 and the surface layers ₂ and 4 are, as shown in FIG. The respective regions of the _partial region A1 and the other end region A2, that is, the water retaining layer 3 and the surface layers ₂ and 4 are joined in both end regions of the cleaning sheet 1 in the _second direction D2. The cleaning sheet 1 is in the center of the _second direction D2 while maintaining the structure of the cleaning sheet because the water retaining layer 3 and the surface layers 2 and 4 are joined in both end regions in the _second direction D2. In the area A _C , as shown in FIG. 5 , the surface layers 2 and 4 tend to move relatively staggered in the second direction D ₂ (ideally, the direction corresponding to the wiping direction during cleaning) with respect to the water-retaining layer 3 . Therefore, the first When the ₂ -direction D2 is used as the wiping direction at the time of cleaning, the above-mentioned excellent dirt removal performance can be exhibited more consistently and reliably.

Here, the central portion area A _C in the second direction D ₂ is an area extending in the first direction D ₁ so as to include the central portion of the cleaning sheet 1 in the second direction D ₂ as shown in FIG. 1 . , and is divided into an area having about 2/4 of the length in the second direction (full length in the second direction) of the cleaning sheet 1 in the second direction, and an end area A1 on _one side of the _second direction D2 and the other side end region A2 ₍ that is, both end regions), as shown in FIG. 1, from both sides of the _second direction D2 sandwiching the above-mentioned central region A _C and the central region The regions adjacent to AC in the second direction _{D 2} are divided into regions each having approximately 1/4 of the length in the second direction with respect to the length in the second direction of the cleaning sheet 1 .

In addition, the cleaning sheet 1 retains water as long as the surface layers 2 and 4 are easily displaced in the _second direction D2 with respect to the water retaining layer 3 in at least the central region A _C in the _second direction D2 serving as the wiping surface. The layer 3 and the surface layers 2 and 4 may be joined in the central region _AC , or may not be joined in the central region _AC , or may be joined only in both end regions.

The arrangement form of the joints 61 and 62 between the water retaining layer 3 and the surface layers 2 and 4 is not particularly limited as long as the effect of the present invention is not hindered. For example, the joints 61 and 62 may be arranged at predetermined intervals in the _second direction D2. And a plurality of arbitrary linear (for example, linear, dotted, dotted, wavy, spiral, Ω-shaped, etc.) forms extending along the _first direction D1 are arranged. Among them, each of the joint parts 61 and 62 has a point of removal performance from dirt, etc., a plurality of linear lines extending at intervals of 10 mm to 150 mm in the second direction D ₂ and linearly along the first direction D ₁ Morphology is ideal for configuration.

In addition, the means for forming the joints 61 and 62, that is, the means for joining the water-retaining layer 3 and the surface layers 2 and 4, is not particularly limited so as not to hinder the effect of the present invention, and a thermal fusion method and an ultrasonic fusion method can be used. , any bonding means such as the bonding method that the adhesive is made of.

[Surface Layer] In the above-mentioned cleaning sheet 1, the surface layers 2 and 4 are arranged so as to sandwich the water-retaining layer 3 in the thickness direction _DT . A hydrophobic non-woven fabric for cleaning chemicals is formed. In addition, although the surface layers 2 and 4 may be formed of a hydrophilic non-woven fabric, if they are formed of a hydrophobic non-woven fabric, the cleaning object can be wiped off even with a relatively weak force, even if the cleaning sheet is in a wet state. , the constituent fibers are not easy to collapse, and can exert more excellent dirt removal performance.

The hydrophobic nonwoven fabric forming the surface layers 2 and 4 is not particularly limited as long as it can form the wiping surface of the cleaning sheet 1, and any hydrophobic nonwoven fabric can be used. Such a hydrophobic nonwoven fabric may have hydrophobicity as a nonwoven fabric. Therefore, a nonwoven fabric may be formed of only hydrophobic fibers, or a nonwoven fabric formed of hydrophilic fibers and hydrophobic fibers.

There is no particular limitation on such hydrophobic nonwovens, for example, water jet nonwovens, air-formed nonwovens, spunbond nonwovens, meltblown nonwovens, thermally bonded nonwovens (such as : Hot air non-woven fabrics, point-bonded non-woven fabrics, etc.), chemically bonded non-woven fabrics, etc. However, non-woven fabrics and water needle non-woven fabrics produced by dry processes such as hot air non-woven fabrics, point-bonded non-woven fabrics, etc. are ideal, and water needle non-woven fabrics are particularly ideal. Because the nonwoven fabrics and water needle nonwoven fabrics produced by such a dry process have the property of being easily stretched (in addition, the nonwoven fabrics produced by the dry process have the properties of being easily stretched in the CD direction because the fibers are oriented in the MD direction), When the surface layers 2 and 4 are formed of such a nonwoven fabric, the surface layers 2 and 4 are easily displaced relative to the water-retaining layer 3, and the above-mentioned excellent dirt removal performance can be exhibited more consistently and reliably.

Further, the fibers constituting the hydrophobic nonwoven fabric are not particularly limited as long as the effects of the present invention are not inhibited, and examples thereof include synthetic fibers and cellulose fibers exemplified as the constituent fibers of the hydrophilic nonwoven fabric forming the above-mentioned water retaining layer 3 . In addition, when the hydrophobic nonwoven fabric is composed of hydrophobic fibers and hydrophilic fibers, the hydrophobic fibers are present in a ratio of 50 mass % or more, preferably 70 mass % or more, with respect to the mass of the entire nonwoven fabric.

The thickness, basis weight, etc. of the hydrophobic nonwoven fabric forming the surface layers 2 and 4 are not particularly limited as long as the effect of the present invention is not hindered. In terms of dirt removal performance, release properties of cleaning chemicals from the non-opening portion 53, etc., the basis weight of the surface layer 1 per layer is ideally in the range of 10 g/m ² to 80 g/m ² , 30 g/m The basis weight in the range of ² to 60 g/m ² is more desirable.

In addition, in the present invention, as long as the surface layer forms the wiping surface of the cleaning sheet and can release the cleaning liquid, any fiber sheet (for example, woven cloth, knitted cloth, etc.) other than the hydrophobic nonwoven cloth, porous resin may be used as the surface layer. Formed by flakes, etc.

(Opening Portion) In the above-mentioned cleaning sheet 1 , the surface layers 2 and 4 have, as shown in FIGS. 1 to 3 , a plurality of openings 50 to 4 on the entire surface thereof penetrating the surface layers 2 and 4 in the thickness direction _DT . 52, and the non-opening part 53 other than the opening part. In addition, as shown in FIGS. 1 to 3 , the plurality of openings 50 to 52 include an opening 50 that is arranged at least on the entire surface and across the _second center region A and _C in the second direction D2 serving as the wiping surface. A part of the region of _both ends in the direction D2 is widely dispersed; and the openings 51 and 52 are arranged in the regions of both ends in the _second direction D2 (that is, arranged in the second direction D2 ₎ . Each of the end region A ₁ on one side and the end region A ₂ on the other side is distributed, and the opening 50 and the openings 51 and 52 have different opening shapes as shown in FIG. 1 . In addition, the opening part 50 and the opening parts 51 and 52 have the same opening shape when the opening part is formed, and in the subsequent manufacturing process, the opening shape is changed by pulling the nonwoven fabric to have the above-mentioned different openings shape.

The means for forming the plurality of openings 50 to 52 is not particularly limited, and examples include the water jet method of shooting water flow on a mesh having a plurality of opening patterns, the needling method of perforating with a plurality of needle-shaped members, and the use of Cutting means, such as a knife, are cutting methods such as cutting out a circular shape. Among them, it is preferable to use a water jet method or a needle punching method from a point where the later-described raised portion 54 is easily formed in the non-opening portion 53 .

In the cleaning sheet of the present invention, the opening area ratio of the plurality of openings is not particularly limited as long as the effect of the present invention is not inhibited, but is preferably in the range of 4% to 60%. When the opening area ratio of the plurality of openings is 4% or more, a predetermined amount or more of dirt can be picked up by the step difference of the edges of the openings, and the excellent dirt removal performance can be exhibited more reliably. In addition, when the opening area ratio of the plurality of openings is 60% or less, a predetermined rigidity can be ensured as a cleaning sheet, and an excellent moisture release property can be more reliably exhibited. In addition, the opening area ratio of the plurality of openings is more preferably in the range of 4% to 50%, and more preferably in the range of 4% to 35%.

In addition, the opening area of the plurality of openings can be measured in the following manner. Using a microscope (VHX-7000 DIGITAL MICROSCOPE, manufactured by KEYENCE Corporation), magnify the surface of the sample to be measured (that is, a sheet for cleaning, a non-woven fabric that forms a surface layer, etc.) at a magnification of 50 times, and use the measuring tool attached to the microscope. (Set the brightness in the range of 0~70) Measure the total area ratio of the black portion of the obtained enlarged image. The total area ratio of the measured black portion becomes the opening area ratio of the plurality of openings.

In the cleaning sheet of the present invention, the opening density of the plurality of openings is not particularly limited as long as the effect of the present invention is not inhibited, and is 1/cm ² to 100/cm ² from the viewpoint of soil removal performance. range is ideal.

Furthermore, the shape of the opening of the opening is not particularly limited, and, for example, any shape such as an ellipse, a circle, a triangle, a quadrangle, a polygon, and a star can be adopted. Also, the size of the opening shape is not particularly limited. For example, when the opening shape is circular, the diameter can be 1 mm to 5 mm, and when the opening shape is oval, the long diameter can be 1 mm to 5 mm, and the short diameter can be 1 mm to 5 mm. It becomes the size of 0.1mm~4mm.

Moreover, in the cleaning sheet of the present invention, the surface layer may be formed on the wiping surface in the shape of a plurality of openings located in the central region in the second direction, and a plurality of openings located in both end regions in the second direction. The shape of the opening of the opening is different. If the opening shapes of the plurality of openings located in the central region in the second direction are different from the opening shapes of the openings located in the both end regions in the second direction, dirt such as garbage and dust can be removed according to the shape of the openings. When the shape and size are captured, especially when the second direction is used as the wiping direction during cleaning, more excellent dirt removal performance can be exhibited.

For example, a plurality of openings located at both end regions in the second direction, which is the wiping direction during cleaning, have a long opening shape in the first direction or a circular opening shape with a small aspect ratio, and are located in the center of the second direction. When the plurality of openings in the region are in the shape of openings long in the first direction with a large aspect ratio, dust and garbage can be caught in the plurality of openings in the end regions, and can be captured in the plurality of openings in the central region. Garbage that escapes from the plurality of openings in the above-mentioned both end regions.

(Non-opening part) In the above-mentioned cleaning sheet 1, as shown in FIGS. 1 to 3, the surface layers 2 and 4 have non-opening parts 53 other than the above-mentioned plural opening parts 50-52 on the entire surface thereof.

Moreover, in the cleaning sheet 1, the non-opening part 53 has the raising part 54 which forms raising|fluff, as shown in FIG. In this way, if the non-opening portions 53 of the surface layers 2 and 4 have the raised portions 54, the dirt such as garbage and dust to be cleaned can be captured by the fibers 54F of the raised portions 54 entangled, so that further excellent dirt removal can be exhibited. performance.

In addition, in the present embodiment, although the raised portion 54 is formed of the constituent fibers of the hydrophobic nonwoven fabric forming the surface layers 2 and 4, in the present invention, the raised portion of the surface layer may be made of nonwoven fabric, woven fabric, knitted fabric, etc. The fibrous flakes are formed from the constituent fibers.

Here, in the present specification, the raised portion refers to a portion exposed on the surface of the fiber sheet when the cut surface of the fiber sheet (for example, non-woven fabric, woven fabric, knitted fabric, etc.) forming the surface layer is cut in the thickness direction when magnified and viewed. There are five or more parts of the cut terminals of the constituent fibers (that is, the fibers that are fluffed) within a range of 5 mm in the direction parallel to the sheet surface of the fiber sheet. In addition, in the cleaning sheet of the present invention, it is preferable that the cutting terminals of the fibers constituting the fibers exposed on the surface of the fiber sheet exist approximately equally in the entire non-opening portion from the point of view of the dirt removal performance of the raised portion. It is preferable that one or more of the above-mentioned sheets are present within a range of 1 mm in the direction in which the sheet surfaces are parallel.

Moreover, in the above-mentioned cleaning sheet 1, since the surface layers 2 and 4 are formed of the hydrophobic nonwoven fabric, the fibers 54F raised in the raised portion 54 have hydrophobicity. In this way, if the raised fibers 54F of the raised portion 54 have hydrophobicity, the cleaning object can be wiped off with a relatively weak force, and the fibers are not easily collapsed even when the cleaning sheet 1 is in a wet state. The above-mentioned excellent soil removal performance.

Further, in the present invention, the fluffed fibers have hydrophobicity, which means that among all the fluffed fibers, the mass ratio of the fibers having hydrophobicity is 50% by mass or more, and the mass ratio of the fibers having such hydrophobicity is 70% by mass. Mass % or more is ideal.

Moreover, in this invention, it is preferable that the surface layer has a static friction coefficient within the range of 0.20-0.40 so that the surface which forms a wiping surface. If the surface of the wiping surface forming the surface layer has a static friction coefficient of 0.20 or more, dirt such as garbage and dust to be cleaned can be reliably wiped off. If the surface of the wiping surface forming the surface layer has a static friction coefficient of 0.40 or less, even if The cleaning object can also be wiped off with a relatively weak force.

In addition, the static friction coefficient of the surface of the surface layer can be measured using a commercially available friction needle (for example, a portable friction meter manufactured by Nisshin Machinery Co., Ltd.).

Furthermore, in the present invention, the surface layer has a first surface facing the water retaining layer, a second surface located on the opposite side of the first surface in the thickness direction, and a hydrophobic material (for example, a hydrophobic material for the second surface) of the second surface. Preferably, the mixing ratio of the hydrophobic fibers, etc. is higher than the mixing ratio of the hydrophobic material on the first surface. When the mixing ratio of the hydrophobic material on the second surface of the surface layer (that is, the surface forming the wiping surface) is higher than the mixing ratio of the hydrophobic material on the first surface, the cleaning chemical solution released from the cleaning sheet It is moderately controlled and can exert more excellent water release properties.

In addition, in the present invention, the cleaning chemical solution may be impregnated during the production of the cleaning sheet, or it may not be impregnated during the production of the cleaning sheet, and may be impregnated with the cleaning chemical solution during use. However, as in the former case, the cleaning sheet impregnated with the cleaning chemical solution in advance has the so-called effective efficiency or performance of the components (for example, water, surfactant, alcohol, glycerol, etc.) corresponding to the cleaning chemical solution. The advantages of cleaning (such as cleaning with a sterilization effect, etc.)

Furthermore, in the present invention, it is preferable that the impregnation amount of the cleaning chemical solution for the water-retaining layer is larger than the impregnation amount of the cleaning chemical solution for the surface layer. The impregnation amount (mass) of the cleaning liquid in the water-retaining layer is larger than the impregnation amount of the cleaning liquid in the surface layer. If the water-retaining layer retains a relatively large amount of the cleaning liquid, the cleaning agent is easily released from the cleaning sheet more continuously. Therefore, excellent water release properties can be exhibited more continuously.

In addition, when the surface layers are laminated on both sides of the water-retaining layer, the impregnation amount of the cleaning chemical solution for the surface layer is not the total impregnation amount of both surface layers, but the impregnation amount of each surface layer.

Furthermore, in the present invention, it is preferable that the impregnation amount of the cleaning chemical solution for the water-retaining layer is 1.5 to 2.5 times the impregnation amount of the cleaning chemical solution for the surface layer. If the impregnation amount of the cleaning chemical solution for the water-retaining layer is 1.5 to 2.5 times the amount of the cleaning chemical solution for the surface layer, an appropriate amount of the cleaning chemical solution can be continuously released from the cleaning sheet, and further excellent performance can be achieved more continuously. of moisture release.

In addition, the cleaning sheet of the present invention is not limited to the above-described embodiments and the like, and appropriate combinations, substitutions, and changes are possible within a range that does not deviate from the purpose and gist of the present invention. In addition, in this specification, the ordinal numbers such as "1st" and "2nd" are used to distinguish the items to which the ordinal numbers are assigned, and do not indicate the order, priority, and importance of each item.

1: Cleaning sheet 2: Surface layer on one side 3: Water retention layer 4: Surface layer on the other side 50: Opening part 51, 52: Opening part 53: Non-opening part 54: Raised part 61, 62: Joint part 63 : one side end portion 64 : other side end portion D ₁ : first direction D ₂ : second direction A ₁ : one side end portion region A ₂ : other side end portion region A _C : central portion area

1 is a plan view as viewed in the thickness direction _DT in a state in which the cleaning sheet 1 according to one embodiment of the present invention is unfolded. FIG. 2 is an enlarged perspective view of a main part of the cleaning sheet 1 . 3 is an end view of a cut surface along the line III-III of the cleaning sheet 1 in FIG. 1 . 4 is an enlarged cross-sectional view of a main part of the cleaning sheet 1 . 5 is an explanatory diagram schematically showing the mechanism of action of the cleaning sheet 1 .

1: Cleaning sheet

2: Surface layer on one side

3: Water retention layer

4: Surface layer on the other side

50: Opening

51: Opening

52: Opening

53: Non-opening part

61: Joint

62: Joint

63: One side end

64: End of the other side

D ₁ : 1st direction

D ₂ : 2nd direction

A ₁ : End region on one side

A ₂ : End region on the other side

A _C : Central area

Claims (12)

A cleaning sheet, comprising: a water-retaining layer and a surface layer, the surface layer is laminated on at least one side of the water-retaining layer to form a wiping surface, and the cleaning sheet is characterized by: The surface layer has, at least on the wiping surface, a plurality of openings penetrating the surface layer in the thickness direction, and non-openings other than the openings, The water-retaining layer and the surface layer are partially bonded. The cleaning sheet of claim 1, wherein the cleaning sheet has a first direction and a second direction orthogonal to each other, The water-retaining layer and the surface layer are joined to both end regions in the second direction. The cleaning sheet according to claim 1 or 2, wherein the opening area ratio of the plurality of openings is in the range of 4% to 60%. The cleaning sheet according to any one of Claims 1 to 3, wherein the cleaning sheet has a first direction and a second direction orthogonal to each other, The surface layer on the wiping surface has a different opening shape of the plurality of openings located in the center region in the second direction from the opening shapes of the plurality of openings located in both end regions in the second direction. The cleaning sheet according to any one of Claims 1 to 4, wherein the surface layer is formed of a fiber sheet, and the non-opening portion has a raised portion where constituent fibers of the fiber sheet are raised. The cleaning sheet according to claim 5, wherein the raised fibers of the raised portion have hydrophobicity. The cleaning sheet according to any one of Claims 1 to 6, wherein the surface layer has a static friction coefficient in the range of 0.20 to 0.40 on the surface forming the wiping surface. The cleaning sheet according to any one of claims 1 to 7, wherein the surface layer is laminated on both surfaces of the water retention layer. The cleaning sheet according to any one of Claims 1 to 8, wherein the surface layer has a first surface facing the water retaining layer, and a first surface opposite to the first surface in the thickness direction. 2 surfaces, The mixing ratio of the hydrophobic material on the second surface is higher than the mixing ratio of the hydrophobic material on the first surface. The cleaning sheet according to any one of claims 1 to 9, wherein the cleaning liquid is impregnated. The cleaning sheet according to claim 10, wherein the impregnation amount of the cleaning chemical solution in the water-retaining layer is greater than the impregnation amount of the cleaning chemical solution in the surface layer. The cleaning sheet according to claim 10 or 11, wherein the impregnation amount of the cleaning chemical solution for the water-retaining layer is 1.5 to 2.5 times the impregnation amount of the cleaning chemical solution for the surface layer.

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