JP6989417B2 - Cleaning sheet - Google Patents

Description

The present invention relates to a cleaning sheet.

As a conventional technique for a cleaning sheet having a multi-layer structure, for example, the one described in Patent Document 1 is known. In the same document, an air-laid nonwoven fabric containing thick heat-fusing fibers having a fineness of 10 to 150 dtex is laminated on one side or both sides of a sheet containing cellulosic fibers, and both are integrated and the surface of the air-laid nonwoven fabric is integrated. Describes a cleaning sheet in which a large number of tips of heat-sealing fibers are present. Due to the thick heat-sealing fibers, this cleaning sheet has sufficient polishing and scraping properties against stains without using abrasive particles.

Japanese Patent Application Laid-Open No. 2003-61885

However, the cleaning sheet described in Patent Document 1 is intended for cleaning articles having a hard surface such as flooring and kitchen surroundings, and is not intended for cleaning living fabrics such as carpets and sofas. Therefore, even if the living fabric is cleaned with the cleaning sheet, it is not easy to remove dust such as hair that has entered between the piles. Further, in wiping with a wet cloth, moisture is released immediately, and it is not easy to wipe a large area at once, and a great deal of labor is required.

Therefore, an object of the present invention is to provide a cleaning sheet that solves the shortcomings of the prior art.

The present invention has a first fiber layer containing hydrophilic fibers and a second fiber layer adjacent to the first fiber layer and containing crimped fibers.
The crimped fiber is composed of a crimped fiber having a fineness of 5 dtex or more and 80 dtex or less and a fiber length of 2 mm or more and 15 mm or less.
It is intended to provide a cleaning sheet in which the hydrophilic fiber and the crimped fiber are present on the surface of the second fiber layer.

INDUSTRIAL APPLICABILITY According to the present invention, there is provided a cleaning sheet having high scraping property and collecting property of dust such as hair existing between piles of living fabric such as carpet and sofa.

FIG. 1 is a schematic cross-sectional view showing an embodiment of a cleaning sheet of the present invention. FIG. 2 is a schematic cross-sectional view showing a state in which a surface to be cleaned (fabric surface) is cleaned by the cleaning sheet shown in FIG. FIG. 3 is a schematic cross-sectional view (corresponding to FIG. 1) showing another embodiment of the cleaning sheet of the present invention. FIG. 4 is a schematic top view showing another embodiment of the cleaning sheet of the present invention. FIG. 5 is a schematic view showing an example of a usage state of the cleaning sheet of the present invention. FIG. 6 is a schematic view showing a device for manufacturing a cleaning sheet of the present invention.

Hereinafter, the present invention will be described based on the preferred embodiment thereof with reference to the drawings. The cleaning sheet of the embodiment shown in FIG. 1 has a multi-layer structure. The multi-layered cleaning sheet 1 is composed of at least a first fiber layer 11 containing hydrophilic fibers 2 and a second fiber layer 12 containing crimped fibers 3. The first fiber layer 11 and the second fiber layer 12 are arranged adjacent to each other, and no other layer is interposed between the first fiber layer 11 and the second fiber layer 12. That is, the first fiber layer 11 and the second fiber layer 12 are directly adjacent to each other.

The cleaning sheet shown in FIG. 1 is directly adjacent to each surface of one surface (upper part in the figure) and the surface opposite to the surface (lower part in the figure) of the first fiber layer 11 and the second fiber layer. It has a three-layer structure in which twelve are arranged. In the cleaning sheet shown in FIG. 1, the surface of the second fiber layer 12 laminated on the surface of the first fiber layer 11 forms the outer surface of the cleaning sheet 1. The surface of the second fiber layer 12 in the cleaning sheet 1 functions as a main cleaning surface.

As described above, the first fiber layer 11 in the cleaning sheet of the present invention contains hydrophilic fibers 2. The first fiber layer 11 may be composed of only the hydrophilic fiber 2 or may contain other fibers. Since the first fiber layer contains hydrophilic fibers 2, when the cleaning sheet of the present invention is used as a wet sheet impregnated with an aqueous solution, the sheet retains sufficient water for cleaning. can do. Details of the hydrophilic fiber 2 and the aqueous liquid will be described later.

The second fiber layer 12 in the cleaning sheet of the present invention contains crimped fibers 3. The crimped fibers 3 in the second fiber layer 12 exist so as to form the outer surface of the cleaning sheet 1. A large number of tip portions of the crimped fibers 3 are present on the cleaning surface of the cleaning sheet 1. The crimped fiber 3 is a fiber whose crimped form has a spiral shape, a zigzag shape, a U shape, or a combination thereof. Since the crimped fiber 3 has such a crimped form, it is possible to easily scrape off the dust existing on the surface to be cleaned, and as a result, it is possible to improve the collectability of the dust. Examples of the crimped fiber 3 include a fiber made of a synthetic resin having a fiber forming ability and having a large fiber diameter. The details of the crimp fiber 3 will be described later.

A large number of tip portions of the crimped fibers 3 are present on the cleaning surface of the cleaning sheet 1. From the viewpoint of exhibiting sufficient scraping property against dirt existing on the surface to be cleaned, the number of the tip portions of the crimp fibers 3 existing on the cleaning surface of the cleaning sheet 1 is 20 / cm ² or more. It is preferably 50 lines / cm ² or more, more preferably 100 lines / cm ² or more, and the upper limit thereof is preferably 4000 lines / cm ² or less, 2000 lines / cm. more preferably ² or less, further preferably 1000 / cm ² or less. The number of the tip portions of the crimped fibers 3 is obtained ^{by dividing the total weight (g / cm 2} ) per unit area of the cleaning surface of the cleaning sheet 1 by the weight (g) of the crimped fibers per fiber. Can be a value.

FIG. 2 schematically shows a state in which the carpet is cleaned using the cleaning sheet 1 shown in FIG. As shown in FIG. 2, the carpet 30 has a base cloth portion 31 and a pile portion 32. The base cloth portion 31 is a surface facing a hard surface such as a floor. The pile portion 32 constitutes a surface to be cleaned on a carpet or the like, and is an aggregate of a plurality of piles 33. The shape of the pile is not limited to this, and may be, for example, a loop-shaped pile. Due to the presence of a plurality of piles 33 in the pile portion 32, not only dust-like and granular dusts but also fibrous dusts such as hair are easily held between the piles 33. There is.

As shown in FIG. 2, when cleaning the carpet 30, the surface of the cleaning sheet 1 on the side of the second fiber layer 12, which is the cleaning surface, is brought into contact with the pile portion 32 of the carpet 30, which is the surface to be cleaned. Then, while lightly pressing the cleaning sheet 1 against the carpet 30, the sheet 1 is reciprocated a plurality of times along the surface direction. Since the crimped fibers 3 contained in the second fiber layer 12 have a large fiber diameter and high rigidity, the crimped fibers 3 are moved between the piles 33 by reciprocating the cleaning sheet 1. It will be easy to get into. Further, because the crimped fibers 3 are crimped, the crimped fibers 3 roll up fibrous dust such as hair in addition to dust-like or granular dust existing between the piles 33. It is entwined between the crimped fibers 3 and collected, and scraped out of the pile 33. In this way, the debris present between the piles 33 of the carpet 30 is effectively removed.

From the viewpoint of improving the collectability of dust and efficiently removing dirt from the surface to be cleaned, the cleaning sheet of the present invention is preferably in the form of a wet sheet impregnated with an aqueous solution. In particular, the hydrophilic fibers 2 in the cleaning sheet 1 are partially exposed to the side of the second fiber layer 12 which is directly adjacent to the first fiber layer 11, and the fibers 2 are the surface of the second fiber layer 12. When the cleaning sheet 1 is used as a wet sheet, the sustained release of the aqueous solution impregnated in the sheet 1 onto the surface to be cleaned is improved, and a large area can be cleaned. It is preferable because it also has the advantage of being achieved. Further, after cleaning, there is an advantage that the surface to be cleaned can be prevented from being excessively wet due to excessive discharge of the aqueous liquid, which is preferable.

From the viewpoint of appropriately adjusting the sustained release property of the aqueous liquid, the abundance ratio of the hydrophilic fibers 2 exposed on the surface of the second fiber layer 12 shall be 3% or more with respect to the area of the entire cleaning surface. It is more preferably 5% or more, and further preferably 50% or less, further preferably 40% or less, from the viewpoint of exerting the scraping performance of the crimped fiber 3. A cleaning sheet having such an abundance ratio of hydrophilic fibers can be manufactured by a manufacturing method described later.

The abundance ratio of the hydrophilic fibers 2 exposed on the surface of the second fiber layer 12 can be measured as follows. That is, after dyeing the entire sheet with a hydrophilic dye, a photograph of the surface of the cleaned surface is taken, and the photograph is binarized by image processing to calculate the ratio of the dyed area to the area of the entire cleaned surface. Can be obtained at.

When the cleaning sheet is a wet sheet, the aqueous liquid is preferably impregnated in the first fiber layer containing mainly hydrophilic fibers from the viewpoint of enhancing the retention of the aqueous liquid in the sheet.

As the aqueous liquid used in the present invention, a liquid having a general composition used for a cleaning sheet, such as water alone or an aqueous solution containing an additive, can be used. Examples of additives used in aqueous liquids include surfactants, bactericides, fragrances, fragrances, deodorants, pH regulators, chelating agents, bleaching agents, alcohols and abrasive particles.

When the cleaning sheet 1 is impregnated with the aqueous liquid, the impregnation ratio of the aqueous liquid in the cleaning sheet is from the viewpoint of both removing dirt from the surface to be cleaned and maintaining the feel of the surface to be cleaned after cleaning. Is preferably 100% by mass or more, and more preferably 150% by mass or more, based on the mass of the cleaning sheet in a dry state. Further, it is preferably 500% by mass or less, more preferably 450% by mass or less, based on the mass of the cleaning sheet in a dry state.

As the hydrophilic fiber 2 contained in the first fiber layer 11, a fiber obtained by subjecting the surface of a synthetic fiber made of a natural fiber, a regenerated fiber, and a synthetic resin having a fiber-forming ability to a hydrophilic treatment can be used.

Examples of natural fibers include cellulose fibers, and specific examples thereof include cotton and pulp. As the regenerated fiber, for example, one kind or two or more kinds selected from rayon, cupra, lyocell, tencel and the like can be used. Examples of the hydrophilization treatment applied to the surface of the synthetic fiber made of a synthetic resin having a fiber forming ability include coating of various surfactants or kneading into the resin, corona discharge treatment and the like. As the hydrophilic fiber, one kind may be used alone or two or more kinds may be used in combination. Of these, hydrophilic fibers made of pulp are preferably used from the viewpoint of improving the balance between liquid retention and sustained release when the cleaning sheet 1 is impregnated with the aqueous liquid.

From the viewpoint of forming a good fiber network between the fibers, the fiber diameter of the hydrophilic fiber 2 is preferably 5 μm or more, more preferably 8 μm or more, further preferably 10 μm or more, and further preferably. The upper limit is preferably 30 μm or less, more preferably 28 μm or less, and even more preferably 25 μm or less. Specifically, the fiber diameter of the hydrophilic fiber 2 is preferably 5 μm or more and 30 μm or less, more preferably 8 μm or more and 28 μm or less, and further preferably 10 μm or more and 25 μm or less. The fiber diameter is the thickness of the fiber defined by the shortest dimension in the short side direction of the fiber in the enlarged plan view, and is measured by, for example, the Keyence digital microscope VHX-5000.

From the viewpoint of increasing the strength and moldability of the cleaning sheet, the first fiber layer 11 may contain other fibers in addition to the hydrophilic fibers 2. As such other fibers, for example, heat-sealing fibers that act as a binder between hydrophilic fibers are preferable. As the heat-sealing fiber, one or more selected from, for example, polyester, polyethylene, low melting point polyester, low melting point polyethylene, modified polyethylene, polypropylene, polyethylene terephthalate and the like can be used. These fibers may be used alone or in combination of two or more.

Heat fusion property in the first fiber layer 11 from the viewpoint of increasing the strength of the cleaning sheet and from the viewpoint of appropriately controlling the retention and release of the aqueous liquid impregnated in the wet sheet. The content ratio of the fiber is preferably 30% by mass or more, more preferably 40% by mass or more, and more preferably 90% by mass or less, more preferably 80% by mass, based on the total mass of the first fiber layer 11. It is more preferably mass% or less. Specifically, the content ratio of the heat-sealing fiber in the first fiber layer 11 is preferably 30% by mass or more and 90% by mass or less, and 40% by mass or more, with respect to the total mass of the first fiber layer 11. It is more preferably 80% by mass or less.

The heat-sealing fiber preferably has a fiber diameter of 3 μm or more, more preferably 5 μm or more, further preferably 10 μm or more, and its upper limit is preferably 35 μm or less, preferably 30 μm. It is more preferably 25 μm or less, and further preferably 25 μm or less. Specifically, the fiber diameter of the heat-sealing fiber is preferably 3 μm or more and 35 μm or less, more preferably 5 μm or more and 30 μm or less, and further preferably 10 μm or more and 25 μm or less. By using a heat-sealing fiber having a fiber diameter in this range, an anchor effect for appropriately immobilizing a hydrophilic fiber (for example, pulp fiber) can be obtained. The fiber diameter can be measured in the same manner as described above.

When a heat-fused fiber is used as another fiber, the fineness of the heat-fused fiber is preferably 0.5 dtex or more, preferably 1.0 dtex or more, from the viewpoint of effectively realizing melting by applying heat. It is more preferably 1.5 dtex or more, and the upper limit thereof is preferably 5.0 dtex or less, more preferably 4.5 dtex or less, and 3.0 dtex or less. Is more preferable. Specifically, the fineness of the heat-sealing fiber is preferably 0.5 dtex or more and 5.0 dtex or less, more preferably 1.0 dtex or more and 4.5 dtex or less, and 1.5 dtex or more and 3.0 dtex or less. The following is more preferable.

The heat-fusing fiber may be a continuous filament of a long fiber or a staple fiber of a short fiber. When the heat-sealing fiber is a short fiber, the fiber length is preferably 2 mm or more, more preferably 3 mm or more, and the upper limit thereof is preferably 15 mm or less, preferably 10 mm or less. Is even more preferable. The fiber length is a fiber length defined by the maximum dimension in the fiber longitudinal direction in a magnified plan view, and is measured by, for example, a Keyence digital microscope VHX-5000.

From the viewpoint of increasing the strength of the cleaning sheet and from the viewpoint of sufficiently retaining the aqueous liquid when the wet sheet is used, the first fiber layer 11 preferably has a basis weight of 50 g / m ² or more. more preferably less 80 g / ^{m 2} or more, and the upper limit thereof is preferably 150 g / ^{m 2} or less, further preferably 130 g / ^{m 2} or less. The basis weight is ^{preferably 50 g / m 2} or more and 150 g / m ² or less, and more preferably 80 g / m ² or more and 130 g / m ² or less.

In relation to the basis weight of the first fiber layer 11, the thickness of the first fiber layer 11 is preferably 1 mm or more, more preferably 1.5 mm or more, and the upper limit thereof is 4 mm or less. Is preferable, and 3.5 mm or less is more preferable. Specifically, the thickness of the first fiber layer 11 is preferably 1 mm or more and 4 mm or less, and more preferably 1.5 mm or more and 3.5 mm or less. By setting the thickness of the first fiber layer 11 to the above range, the strength of the cleaning sheet can be maintained, and the sheet is less likely to break during use. Further, when the cleaning sheet of the present invention is used in the form of a wet sheet, when pressure is applied to the sheet of the present invention by hand or a tool, the aqueous liquid can be slowly and sufficiently released with high responsiveness. The thickness of the first fiber layer is, for example, according to JIS L 1096: 2010, and the cross section of the sheet when a constant pressure of 0.3 kPa is applied to the sample for 10 seconds is observed, and the shortest distance in the lateral direction is made by KEYENCE in a magnified plan view. It is determined by measuring with a digital microscope VHX-5000.

The crimped fiber 3 is preferably made of a synthetic resin having a fiber forming ability and has a large fiber diameter. From the viewpoint of improving the dust scraping performance and the stain removing property, the crimped fiber 3 preferably has a thicker fiber thickness (fiber diameter) than the hydrophilic fiber 2. That is, it is preferable that the hydrophilic fiber 2 has a thinner fiber than the crimped fiber. Further, from the viewpoint of entwining dirt between the crimped fibers 3 and facilitating removal, it is also preferable that the crimped fibers 3 existing on the surface of the second fiber layer 12 are spirally crimped. As the fiber constituting the crimped fiber 3, a latent crimped fiber which is a fiber in which spiral crimping is developed by applying heat may be used. The latent crimped fibers will be described in detail in the method for manufacturing a cleaning sheet described later.

From the viewpoint of exhibiting sufficient scraping performance or sufficient collecting performance for dust, the fineness of the crimp fiber 3 is preferably 5 dtex or more, more preferably 10 dtex or more, and more preferably 15 dtex or more. Further, the upper limit thereof is preferably 80 dtex or less, more preferably 70 dtex or less, and further preferably 50 dtex or less. Specifically, the fineness of the crimped fiber 3 is preferably 5 dtex or more and 80 dtex or less, more preferably 10 dtex or more and 70 dtex or less, and further preferably 15 dtex or more and 50 dtex or less.

From the same viewpoint, the crimped fiber 3 preferably has a fiber diameter of 0.5 mm or more, more preferably 1.0 mm or more, further preferably 2.0 mm or more, and further preferably. The upper limit is preferably 30 mm or less, more preferably 25 mm or less, and even more preferably 15 mm or less. Specifically, the fiber diameter of the crimped fiber 3 is preferably 0.5 mm or more and 30 mm or less, more preferably 1.0 mm or more and 25 mm or less, and further preferably 2.0 mm or more and 15 mm or less. preferable. The fiber diameter of the crimped fiber refers to the fiber diameter in a state where the crimp is expressed, and can be measured in the same manner as the above-mentioned measuring method.

From the same viewpoint, the crimped fiber 3 preferably has a fiber length of 2 mm or more, more preferably 2.5 mm or more, further preferably 3 mm or more, and its upper limit is 15 mm. It is preferably less than or equal to, more preferably 12 mm or less, still more preferably 10 mm or less. Specifically, the fiber length of the crimped fiber 3 is preferably 2 mm or more and 15 mm or less, and more preferably 3 mm or more and 10 mm or less. The fiber length of the crimped fiber refers to the fiber length in a state where the crimp is expressed. That is, the fiber length of the crimped fiber is the apparent fiber length of the crimped fiber, and is not the fiber length measured in a state where the crimped state is released by a method such as stretching the fiber. The fiber length of the crimped fiber can be measured in the same manner as described above.

From the viewpoint of further improving the dust scraping performance, the number of crimped fibers 3 is preferably 1 or more, more preferably 2 or more, and the upper limit thereof is preferably 10 or less. It is more preferably 8 or less. The number of crimped fibers can be measured according to the method described in JIS L 1015.

From the viewpoint of further improving the dust scraping performance and the collectability of dirt, the crimped fiber 3 existing on the surface of the second fiber layer 12 is spirally crimped, and the fiber 3 is used. It is preferable that the angle formed by the axial direction of the spiral and the surface direction of the cleaning sheet is within a predetermined range. More specifically, the angle formed by the axial direction of the spiral in the crimped fiber 3 and the surface direction of the cleaning sheet is preferably 20 degrees or more, and more preferably 23 degrees or more as an average value of the angles. It is more preferably 25 degrees or more, and the upper limit thereof is preferably 90 degrees or less, more preferably 89 degrees or less, and further preferably 88 degrees or less. Specifically, it is preferable that the angle formed by the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet is 20 degrees or more and 90 degrees or less as an average value of the angles. It is more preferably 23 degrees or more and 89 degrees or less, and further preferably 25 degrees or more and 88 degrees or less.

The angle formed by the axial direction of the spiral in the crimped fiber 3 and the surface direction of the cleaning sheet can be measured, for example, as follows. That is, the sample is cut in the thickness direction with a razor or a professional Rasha scissors, and the cross section of the sample is magnified and observed using a scanning electron microscope (for example, JSM-IT100 manufactured by JEOL Ltd.). The straight line connecting both ends of the outer surface of the second fiber layer 12 observed in the cross section of the sample is defined as the "plane direction of the cleaning sheet". Further, the straight line connecting one end and the other end of the crimped fiber 3 observed in the cross section of the sample is defined as the "axial direction of the spiral in the crimped fiber". If one end and the other end cannot be specified, the start point and the end point of the crimping are defined as one end and the other end. Of the angles formed by these straight lines, the angle on the acute angle side is measured by a scanning electron microscope.

The second fiber layer 12 is configured to include at least the crimped fiber 3, and may be configured to include other fibers in addition to the crimped fiber 3. Examples of other fibers include hydrophilic fibers 2 and heat-sealing fibers contained in the first fiber layer 11 described above. By including the hydrophilic fibers 2 in the second fiber layer 12, when the cleaning sheet 1 is in the form of a wet sheet as described above, the surface of the aqueous liquid impregnated in the sheet 1 to be cleaned is reached. The sustained release property is improved and a large area can be cleaned. Further, by including the heat-sealing fibers in addition to the crimp fibers 3, it is possible to prevent the crimp fibers from falling off even by friction with the surface to be cleaned of the cleaning sheet 1. As the heat-sealing fiber, those described above can be used.

When the second fiber layer 12 contains other fibers in addition to the crimped fibers 3, the content ratio of the other fibers is preferably 10% by mass or more with respect to the total mass of the second fiber layer 12, 20 It is more preferably mass% or more. Further, it is preferably 50% by mass or less, and more preferably 40% by mass or less. Specifically, the ratio of other fibers contained is preferably 10% by mass or more and 50% by mass or less, and 20% by mass or more and 40% by mass or less with respect to the total mass of the second fiber layer 12. Is more preferable.

The second fiber layer 12 preferably has a basis weight of 40 g / m ² or more, more preferably 50 g / m ² or more, further preferably 60 g / m ² or more, and its upper limit is 120 g. It is preferably / m ² or less, more preferably 110 g / m ² or more, and further preferably 100 g / m ² or less. When the basis weight is within the above range, in addition to dust and granular dust, the scraping property of dust such as hair is further improved, and the dust collecting property and holding property are further improved.

The cleaning sheet 1 having the above configuration is suitable for cleaning living fabrics such as articles having pile fabrics such as carpets, upholstered sofas, and curtains. In particular, when the cleaning sheet is a wet sheet, the crimped fibers 3 and the aqueous liquid can easily scrape off dust and improve the collection of dirt, which is more suitable for cleaning the living fabric. It is a thing.

Next, another embodiment of the present invention will be described with reference to FIG. As for the points not particularly described with respect to the embodiment shown in FIG. 3, the description of the embodiment shown with FIGS. 1 and 2 is appropriately applied. Further, in FIG. 3, the same members as those in FIGS. 1 and 2 are designated by the same reference numerals.

In the cleaning sheet 1 shown in FIG. 3, similarly to FIG. 1, two second fiber layers 12 are arranged adjacent to each surface of one surface and the other surface of the first fiber layer 11. The orientation of the crimped fibers 3 in the second fiber layer 12 is different between one surface and the other surface of the cleaning sheet 1. In any surface, the hydrophilic fiber 2 is exposed on the surface of the second fiber layer 12.

Specifically, when focusing on one second fiber layer 12A and the other second fiber layer 12B in the cleaning sheet 1, the spirally crimped crimped fibers 3 present in the second fiber layer 12 are: The average value of the angles formed by the axial direction of the spiral and the surface direction of the cleaning sheet is different between the second fiber layer 12A on one side and the second fiber layer 12B on the other side. That is, as shown in FIG. 3, the average value of the angles formed by the axial direction of the spiral of the crimped fiber 3 in one second fiber layer 12A and the surface direction of the cleaning sheet is the other second fiber layer 12B. It is larger than the average value of the angles formed by the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet. The average value of the angles formed by the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet can be measured according to the above method.

By having such a configuration, when the cleaning sheet 1 is impregnated with the aqueous liquid, the sustained release performance of the aqueous liquid to the surface to be cleaned is the same, but the feeling of use when cleaning is cleaned. It can be used properly according to the purpose. For example, when it is desired to perform soft cleaning so as not to damage the surface to be cleaned, the surface on the second fiber layer 12B side where the angle between the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet is small is used. When you want to clean the surface to be cleaned that can be used and is significantly soiled, use the surface on the second fiber layer 12A side where the angle between the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet is large. be able to.

As the cleaning sheet 1 shown in FIGS. 1 to 3, the sheet may be used as it is, or may be used by attaching the sheet to, for example, a cleaning tool described in Japanese Patent Application Laid-Open No. 2011-183153. When the cleaning sheet 1 is used as it is, as shown in FIG. 4, a plurality of notches C are provided in the cleaning sheet 1, and as shown in FIG. 5, the cleaning performer's finger is inserted into the notches C. It is also possible to make it insertable and clean the surface F to be cleaned.

When a plurality of notches C are provided in the cleaning sheet 1, for example, a first notch C1 extending in the X direction and into which a thumb or little finger can be suitably inserted, and a first notch C1 located on one end side in the X direction, the index finger, the middle finger and the like. A second notch C2 into which any one of the ring fingers can be suitably inserted can be provided. With such a configuration, the pressure on the surface to be cleaned can be applied substantially uniformly through the cleaning sheet, so that uneven cleaning of the surface to be cleaned can be reduced and cleaning efficiency can be improved. .. The relationship between each notch C and the finger to be inserted is not particularly limited. For example, a plurality of fingers can be inserted into one notch C, or the index finger, middle finger and ring finger can be inserted into the first notch C1. It can be appropriately changed according to the surface to be cleaned, such as inserting one of the fingers and inserting the thumb or little finger into the second notch C2.

The above has been described with respect to a suitable embodiment of the cleaning sheet of the present invention. Hereinafter, a suitable manufacturing method of the cleaning sheet of the present invention is taken as an example of the method of manufacturing the cleaning sheet shown in FIG. This will be described based on the manufacturing apparatus 100 shown in FIG. The present manufacturing method includes a step of laminating a web containing latent crimp fibers on both sides of a web containing hydrophilic fibers to form a laminate (lamination step), and heating the laminate to integrate the laminate and latent. It is roughly classified into a process (heating process) of crimping a crimped fiber into a crimped fiber.

The manufacturing apparatus 100 shown in FIG. 6 is provided with a breathable transport belt 110 made of an endless belt. The transport belt 110 is provided with two transport rolls 111 and 111 so as to draw an orbit in a single direction (convey direction MD).

Above the transport belt 110, a first web forming portion 120 for laminating and forming a first web 3W (hereinafter, also simply referred to as “first web 3W”) containing latent crimp fibers 3P, and a hydrophilic fiber 2 A second web forming portion 130 for laminating and forming a second web 2W (hereinafter, also simply referred to as “second web 2W”) including the first web 3W, and a third web including the latent crimp fiber 3P. A third web forming portion 140 for further laminating and forming the web 3W'(hereinafter, also simply referred to as "third web 3W'") on the upper surface of the second web 2W is provided. By passing through the first to third web forming portions 120, 130, 140 in this order, the web 3W, 3W'containing the latent crimp fiber 3P is arranged on both sides of the web 2W containing the hydrophilic fiber 2. 5 can be formed.

Further, in order to form the laminated body 5 by sucking the above-mentioned web toward the transport belt side on the lower surface side of the laminated body 5 at a position facing the first to third web forming portions 120, 130, 140. Suction box 150 is provided. As described above, the present manufacturing apparatus has the same configuration as the manufacturing apparatus used in the general airlaid method.

A heating device 160 for heating the laminated body 5 is provided on the downstream side in the transport direction MD. The heating device 160 heats and integrates the laminated body 5 and crimps the latent crimped fiber 3P to form the crimped fiber 3. The heating device 160 conveys the laminated body 5 inside the layered body 5 so that the laminated body 5 can be heated. The mode of heating the laminated body 5 in the heating device 160 is not particularly limited, and the laminated body 5 can be heated by, for example, a heater, blowing hot air, or irradiating infrared rays.

A suitable manufacturing method of the cleaning sheet using the manufacturing apparatus 100 shown in FIG. 6 is as follows. First, the web containing the latent crimp fibers 3P is laminated on both sides of the web containing the hydrophilic fibers 2 to form the laminated body 5 (lamination step). Specifically, the first web forming portion 120 supplies a fiber aggregate containing the latent crimped fiber 3P and, if necessary, a heat-sealing fiber as a binder, and transfers the first web 3W on the transport belt. To form. After that, a fiber aggregate containing the hydrophilic fiber 2 and, if necessary, a heat-sealing fiber as a binder is supplied from the second web forming portion 130, and the second web 2W is placed on the first web 3W. To form. Further, the third web forming portion 140 supplies a fiber aggregate containing the latent crimped fiber 3P and, if necessary, a heat-sealing fiber as a binder, to make the third web 3W'a second web 2W. Form on top. In this way, the laminate 5 in which the webs 3W and 3W'containing the latent crimp fibers 3P are arranged on both sides of the web 2W containing the hydrophilic fibers 2 can be formed.

The latent crimped fiber is composed of, for example, an eccentric core-sheath type composite fiber or a side-by-side type composite fiber containing two types of thermoplastic polymer materials having different shrinkage rates. Examples of the constituent components of the fiber include polyesters such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyamides, and combinations thereof. Other examples include those described in JP-A-9-296325. Examples of two types of thermoplastic polymer materials having different shrinkage rates include, for example, a combination of an ethylene-propylene random copolymer and polypropylene. From the viewpoint of exhibiting better shrinkage, a side-by-side composite fiber using a combination of polypropylene and polyethylene is preferable.

Next, the laminated body 5 formed in the laminating step is heated and integrated, and the latent crimped fiber 3P is crimped to obtain the crimped fiber 3 (heating step). By heating the laminate 5 in the heating device 160, the heat-sealing fibers, which are binders, are melted, and as a result, the hydrophilic fibers 2, the latent crimp fibers 3P, and the hydrophilic fibers 2 and The latent crimp fibers 3P are adhered to each other. At the same time, in the latent crimped fiber 3P, spiral crimping is developed by applying heat, and the crimped fiber 3 is formed. Through such a step, a first fiber layer 11 made of a non-woven fabric containing hydrophilic fibers 2 and a second fiber layer 12 containing crimped fibers 3 are provided, and these layers are laminated and integrated for cleaning. Sheet 1 is manufactured. If it is desired to further strengthen the integration of each layer, fusion by heat embossing or ultrasonic embossing can be further performed.

In particular, in the first web 3W, the orientation angle of the fibers constituting the first web 3W is determined by the direct pressing of the first web 3W against the transport belt 110 by the suction force generated by the suction box 150. It is different from the orientation angle of the fibers constituting the third web 3W'. Specifically, in the constituent fibers of the first web 3W, the angle formed by the fibers and the surface direction of the laminate is laminated with the axial direction of the constituent fibers of the third web 3W'constituting the non-contact surface of the transport belt 110. It is smaller than the angle formed by the surface direction of the body. That is, the constituent fibers of the third web 3W'are in a fluffier state than the constituent fibers of the first web 3W.

In this state, by applying the heat treatment in the heating step to the laminated body 5, the latent crimp fibers 3P existing in the first web 3W and the third web 3W'are spirally crimped by applying heat. .. On the other hand, since the alignment angle of the fibers does not substantially change by heating, the crimped fibers 3 in which the alignment angles of the fibers and the axial direction of the spiral substantially match are formed. In the cleaning sheet manufactured in this manner shown in FIG. 3, the spirally crimped fibers 3 existing in the second fiber layer 12 have the axial direction of the spiral and the surface direction of the cleaning sheet. The average value of the angles formed by the spirals is different between the second fiber layer 12A on one side and the second fiber layer 12B on the other side. That is, as shown in FIG. 3, the average value of the angles formed by the axial direction of the spiral of the crimped fiber 3 in one second fiber layer 12A and the surface direction of the cleaning sheet is the other second fiber layer 12B. It is larger than the average value of the angles formed by the axial direction of the spiral of the crimped fiber 3 and the surface direction of the cleaning sheet.

The heating temperature in the heating step can be appropriately adjusted depending on the raw material of the constituent fibers, the melting point, and the like, but is preferably 130 ° C. or higher and 200 ° C. or lower, and more preferably 140 ° C. or higher and 180 ° C. or lower. Further, the heat treatment time in the heating step can be 10 seconds or more and 100 seconds or less. Specifically, when pulp is used as the hydrophilic fiber, PET / co-PET core sheath fiber is used as the heat-sealing fiber, and PET / co-PET core sheath fiber is used as the latent crimp fiber, heating in the heating step is performed. The temperature may be 150 ° C. or higher and 170 ° C. or lower, and the heat treatment time in the heating step may be 20 seconds or longer and 80 seconds or lower.

When latent crimp fibers and heat-sealing fibers are used when forming a web containing latent crimp fibers, latent crimping is performed from the viewpoint of efficiently developing spiral crimping properties and ensuring the strength of the sheet. The fiber diameter of the fiber is preferably 150% or more, more preferably 175% or more, and further preferably 200% or more of the fiber diameter of the heat-sealing fiber. Further, it is preferably 650% or less, more preferably 625% or less, and further preferably 600% or less. Specifically, the fiber diameter of the crimped fiber is preferably 150% or more and 650% or less of the fiber diameter of the heat-sealing fiber, more preferably 175% or more and 625% or less, and more preferably 200% or more. It is more preferably 600% or less. The fiber diameter and fiber length of the latent crimped fiber are the fiber diameter and fiber length after the onset of crimping. The fiber diameter and fiber length of the latent crimped fiber can be measured in the same manner as described above.

The cleaning sheet manufactured through the heating step can be made into a dry sheet (dry sheet) as it is, and in the step after the heating step, the dry cleaning sheet is impregnated with an aqueous solution. It can also be in the form of a wet sheet (wet sheet).

In the cleaning sheet of the present invention, the hydrophilic fibers 2 in the sheet are present so as to be partially exposed on the surface of the second fiber layer 12, and the cleaning sheet of the present invention having such a configuration is available. It can be manufactured under the following manufacturing conditions. That is, the opening holes of the punching rotary drums provided in the forming heads of the first web forming portion 120 and the third web forming portion 140 are formed into an elliptical shape, a track circle, a rectangular shape, or the like slightly larger than the fiber length. In this state, the first web 3W, which is a latent crimp fiber, is non-uniformly laminated on the transport belt 110, and then the second web 2W is uniformly laminated on the first web 3W from the second web forming portion 130. Further, the third web 3W'is unevenly laminated on the second web 2W. By adopting such a manufacturing method, the hydrophilic fiber 2 can be manufactured so as to be partially exposed on the surface of the second fiber layer 12.

As described above, the cleaning sheet 1 of each embodiment is, for example, cleaning of buildings such as floors, walls, ceilings and pillars, cleaning of fittings and equipment, wiping of hard surfaces such as articles, and appliances related to the body and body. It is suitable for cleaning so-called living fabrics, which are articles having pile fabrics such as carpets, upholstered sofas or curtains, in addition to cleaning.

Although the present invention has been described above based on the preferred embodiment thereof, the present invention is not limited to such an embodiment. For example, although the cleaning sheet in each embodiment has been described as a sheet having a three-layer structure, the cleaning sheet may have a two-layer structure in which the second fiber layer 12 is laminated only on one surface of the first fiber layer 11. In this case, the surface of the first fiber layer 11 forms the other outer surface of the cleaning sheet 1.

In the case of producing a cleaning sheet having a two-layer structure, in the laminating step, a web containing latent crimp fibers is laminated on only one side of the web containing hydrophilic fibers to form a laminated body, and then heating is performed. The process may be performed.

Further, the cleaning sheet of the present invention does not have to carry an aqueous solution on the sheet itself. Specifically, even if the water-based liquid is directly applied or sprayed on the surface to be cleaned and the surface to be cleaned is cleaned using a dry cleaning sheet in the state where the water-based liquid is present on the target surface. good. Even in such an embodiment, the effect of the present invention is sufficiently exhibited.

1 Cleaning sheet 2 Hydrophilic fiber 3 Crimped fiber 11 First fiber layer 12 Second fiber layer 30 Carpet 31 Base cloth part 32 Pile part 100 Manufacturing equipment C Notch part

Claims (10)

It has a first fiber layer containing hydrophilic fibers and a second fiber layer adjacent to the first fiber layer and containing crimped fibers.
The crimped fiber is composed of a crimped fiber having a fineness of 5 dtex or more and 80 dtex or less and a fiber length of 2 mm or more and 15 mm or less.
The hydrophilic fibers contained in the first fiber layer are partially exposed to the side of the second fiber layer which is directly adjacent to the first fiber layer.
A cleaning sheet in which the hydrophilic fibers and the crimped fibers are mixed and present on the surface of the second fiber layer. A cleaning sheet having a first fiber layer containing hydrophilic fibers and a second fiber layer adjacent to the first fiber layer and containing crimped fibers.
The second fiber layer is arranged adjacent to each surface of the first fiber layer, and the second fiber layer is arranged.
The crimped fiber is composed of a crimped fiber having a fineness of 5 dtex or more and 80 dtex or less and a fiber length of 2 mm or more and 15 mm or less.
The hydrophilic fiber and the crimped fiber are present on the surface of the second fiber layer.
The crimped fibers existing on the surface of the second fiber layer are spirally crimped, and the average value of the angles formed by the axial direction of the spiral in the crimped fibers and the surface direction of the cleaning sheet is A cleaning sheet that is different between one second fiber layer and the other second fiber layer. The crimped fibers existing on the surface of the second fiber layer are spirally crimped, and the angle formed by the axial direction of the spiral in the crimped fibers and the surface direction of the cleaning sheet is 20 degrees on average. The cleaning sheet according to claim 1 or 2 , which is 90 degrees or more and 90 degrees or less. The cleaning sheet according to claim 1 or 3 , wherein the second fiber layer is arranged adjacent to each surface of the first fiber layer. The cleaning sheet according to claim 2 or 4 , wherein the hydrophilic fiber and the crimped fiber are present on the surface of each second fiber layer. The crimped fibers existing on the surface of the second fiber layer are spirally crimped, and the average value of the angles formed by the axial direction of the spiral in the crimped fibers and the surface direction of the cleaning sheet is The cleaning sheet according to claim 4 or 5 , which is different between one second fiber layer and the other second fiber layer. The cleaning sheet according to any one of claims 1 to 6 , wherein the hydrophilic fiber has a thickness thinner than that of the crimped fiber. The cleaning sheet according to any one of claims 1 to 7 , wherein the hydrophilic fiber is made of pulp. The cleaning sheet according to any one of claims 1 to 8 , which is a wet sheet impregnated with an aqueous solution. The cleaning sheet according to any one of claims 1 to 9 , which is used for cleaning the living fabric.

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