Cleaning sheet

Abstract

To provide a cleaning sheet that absorbs dirt and dust, and is less likely to be damaged when attached to cleaning equipment. [Solution] A cleaning sheet is provided, which has multiple protrusions on at least one surface and is made of a nonwoven fabric formed by the melt-blown method using a raw material which is a polypropylene resin blended with an olefin elastomer or styrene elastomer in a weight ratio of 1% to 30%.

Description

Technical Field

[0001] One aspect of the present invention relates to a cleaning sheet.

Background Art

[0002] Conventionally, there has been a cleaning sheet made of non-woven fabric for wiping and cleaning floors, equipment, and furnishings. Patent Document 1 discloses a technique for forming a non-woven fabric sheet by the melt blow method using a polypropylene-based resin as a raw material to obtain a non-woven fabric for cleaning.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, although the polypropylene-based resin used as the raw material of the polypropylene-based melt-blown non-woven fabric described in Patent Document 1 has high lipophilicity and can be said to be an appropriate material as a wiper for wiping oil, there are problems with its strength. That is, when used as a cleaning sheet attached to a cleaning tool, it may be damaged during attachment due to insufficient strength.

Means for Solving the Problems

[0005] The present invention provides the following cleaning sheet in order to solve the above problems.

[0006] One aspect of the present invention has a plurality of convex portions on at least one surface, and is composed of a non-woven fabric formed by the melt blow method using a raw material in which an olefin-based elastomer or a styrene-based elastomer is blended with a polypropylene-based resin at a weight ratio of 1% or more and 30% or less. These are cleaning sheets.

[0007] The cleaning sheets described above utilize a material in which olefin-based elastomer or styrene-based elastomer is blended with polypropylene resin in an appropriate weight ratio. This improves not only lipophilicity but also mechanical strength, such as tear strength. As a result, damage to the cleaning sheets when attaching them to cleaning equipment (holders) can be suppressed.

[0008] In the above-mentioned cleaning sheet, it is preferable that the nonwoven fabric contains paraffin wax in a weight ratio of 0.3% to 5.0%.

[0009] According to the cleaning sheet described above, by incorporating paraffin wax in an appropriate weight ratio, it is possible to impart appropriate flexibility. This makes it easier for the cleaning sheet to conform to and adhere to the floor surface being cleaned, thereby improving the dust collection efficiency of the cleaning sheet.

[0010] In the above-mentioned cleaning sheet, it is preferable that the protrusions are formed by a repeating rectangular pattern.

[0011] The cleaning sheet described above improves dust collection efficiency while reducing the contact area with the floor or other surface being cleaned, thereby reducing the force required to move it across the surface. In other words, the cleaning sheet moves more smoothly, reducing the burden on the user.

[0012] In the above-mentioned cleaning sheet, it is preferable that the average fiber diameter of the polypropylene resin constituting the nonwoven fabric is 1.0 μm or more and 10.0 μm or less.

[0013] According to the cleaning sheet described above, it is possible to clean while maintaining the flexibility of the cleaning sheet and being less likely to be crushed during cleaning, thus creating an appropriate gap between the fibers, and thereby improving the efficiency of dust collection. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 is a plan view of the cleaning sheet. [Figure 2] Figure 2 is a cross-sectional view of the cleaning sheet. [Modes for carrying out the invention]

[0015] The following describes embodiments of the cleaning sheet of the present invention with reference to the drawings. However, the embodiments described below are merely examples of the present invention and should not be interpreted as limiting the technical scope of the present invention. In each drawing, the same components are denoted by the same reference numerals, and their descriptions may be omitted.

[0016] [Composition of Cleaning Sheet 1] Figure 1 is a plan view of the cleaning sheet 1 of this embodiment, as seen from the cleaning surface that comes into contact with the object to be cleaned during cleaning. The cleaning sheet 1 is made of nonwoven fabric. Multiple protrusions 2 are formed on the cleaning surface of the cleaning sheet 1 in a repeating pattern. In a plan view, adjacent protrusions 2 are separated by recesses 3.

[0017] Figure 2 is a cross-sectional view of the cleaning sheet 1. The cleaning sheet 1 has a convex portion 2 and a concave portion 3. The convex portion 2 is rhombic in plan view, with the length of the longer diagonal being 8.0 mm and the length of the shorter diagonal being 4.0 mm. However, the size of the rhombic shape forming the convex portion 2 is not limited to this, and the convex portion 2 does not necessarily have to be rhombic in plan view.

[0018] The central part of the convex portion 2, that is, the part that is the intersection of the diagonals in the diamond-shaped convex portion 2 in plan view, is the highest top portion 2a in the convex portion 2 as shown in the cross-sectional view of FIG. 2. On the other hand, the central part of the concave portion 3 is the lowest bottom portion 3a in the concave portion 3 as shown in the cross-sectional view of FIG. 2. The length (thickness) H1 from the back surface 1a of the cleaning sheet 1 to the top portion 2a is 0.5 mm or more and 1.5 mm or less, and the length (thickness) H2 from the back surface 1a of the cleaning sheet 1 to the bottom portion 3a is 0.1 mm or more and 0.5 mm or less. The thickness of the non-woven fabric is measured by PG-11J manufactured by Techlock Co., Ltd.

[0019] The non-woven fabric is formed of a raw material in which an olefin-based elastomer or a styrene-based elastomer is blended with a polypropylene-based resin. Specifically, the non-woven fabric is made of a raw material in which ExxonMobil's Vistamaxx (registered trademark) 6902 is added to a polypropylene-based resin as an olefin-based elastomer at a weight ratio of, for example, 1% or more and 30% or less, preferably 5% or more and 30% or less. Further, to the raw material of the non-woven fabric, HNP-10 of Nippon Seiro Co., Ltd. is added as paraffin wax at a weight ratio of 0.3% or more and 5.0% or less. The non-woven fabric is formed by using this raw material and forming it into a non-woven fabric by the melt blow method as described later.

[0020] The basis weight (weight per unit area) of the formed non-woven fabric is 10 g / m 2 or more and 70 g / m 2 or less, preferably 20 g / m 2 or more and 60 g / m 2 or less, and for example, 50 g / m 2 is used. This is measured by JIS L1913:2010 6.2 Mass per unit area (ISO method).

[0021] The fiber diameter of the non-woven fabric is 1.0 μm or more and 10.0 μm or less, preferably 2.0 μm or more and 4.0 μm or less. This is measured by VK-X 3000 (laser microscope) manufactured by Keyence Corporation.

[0022] The nonwoven fabric is cut to a size of 200mm x 300mm and used as cleaning sheet 1. The size of cleaning sheet 1 may be changed as needed.

[0023] The cleaning sheet 1 may be used attached to a cleaning tool (holder), such as a plate-shaped member with a handle attached, and may be folded into a shape that is easy to attach to this holder.

[0024] [Manufacturing method for cleaning sheet 1] Next, we will explain how to manufacture the cleaning sheet 1.

[0025] First, as described above, a raw material is prepared by blending polypropylene resin with olefin elastomer and paraffin wax.

[0026] Next, a nonwoven fabric having a repeating rhombic pattern formed by convex portions 2 and concave portions 3 is formed by the melt-blowing method.

[0027] Next, the formed nonwoven fabric is charged. Other methods may be used to charge the nonwoven fabric, such as corona discharge or charge injection. Existing methods may be used to charge the nonwoven fabric.

[0028] The nonwoven fabric formed on the base is cut and peeled off the base, and then further cut into predetermined sizes, for example, 200 mm in length and 300 mm in width.

[0029] The cleaning sheet 1 may also be a wet type impregnated with a cleaning solution. In this case, the formed nonwoven fabric is impregnated with the cleaning solution by immersing it in the cleaning solution or by spraying the cleaning solution onto it at some point. The cleaning solution is retained in the voids of the nonwoven fabric and can be allowed to seep out to the surface little by little by capillary action.

[0030] [Differentiation] The cleaning sheet is not limited to the configuration described in the above embodiment, and various modifications are possible.

[0031] The sizes of each element in the cleaning sheet 1 are merely examples and are not limited to the sizes described in the embodiment.

[0032] The cleaning sheet 1 has a shape having multiple rhombus-shaped protrusions 2, but is not limited to this shape. For example, the shape of the protrusions 2 in plan view may be changed from a rhombus to a rectangle such as a square or rectangle, or to a circular or elliptical shape. However, according to the inventor's experimental confirmation, the rhombus shape and size as in the embodiment allowed for particularly effective collection of dust.

[0033] Furthermore, the cleaning sheet 1 may also be configured to have protrusions and recesses similar to those of the protrusions 2 and recesses 3 on the side opposite to the cleaning surface. With such a configuration, for example, both sides of the cleaning sheet 1 can be used for cleaning. That is, after using one side for cleaning, the other unused side can be used for cleaning in a clean state.

[0034] The embodiments and modifications of the present invention have been described in detail above. These embodiments and modifications are merely specific examples of one configuration and one operation of the present invention, and the scope of the present invention is not limited to these embodiments but is broadly interpreted to include the scope that can be grasped by those skilled in the art based on a similar technical concept.

[0035] [Features of cleaning sheets] The cleaning sheet 1 described herein is formed of a nonwoven fabric having a plurality of protrusions 2 on at least one surface. The raw material for the nonwoven fabric is a polypropylene resin blended with an olefin elastomer in a weight ratio of 1% to 30%, and is formed by the melt-blown method. As a result, the cleaning sheet 1 has improved mechanical strength, such as tear strength, in addition to the lipophilicity of the polypropylene resin, and is less likely to be damaged when attached to cleaning equipment. Note that the olefin elastomer may be replaced with a styrene elastomer.

[0036] Furthermore, since cleaning sheet 1 is formulated with paraffin wax in a weight ratio of 0.3% to 5.0%, it is given appropriate flexibility. This allows cleaning sheet 1 to conform to and adhere to the floor surface being cleaned, thereby improving the efficiency of dust collection.

[0037] Furthermore, the cleaning sheet 1 has protrusions 2 formed by a repeating rectangular pattern. By having these protrusions 2, the cleaning sheet 1 increases the efficiency of dust collection while reducing the contact area with the floor surface to be cleaned, thereby reducing the force required to move it over the floor surface. As a result, the cleaning sheet 1 moves more smoothly, reducing the burden on the user.

[0038] Furthermore, since the cleaning sheet 1 has an average fiber diameter of 1.0 μm to 10.0 μm of the polypropylene resin that makes up the nonwoven fabric, it maintains the flexibility of the cleaning sheet and is less likely to be crushed during cleaning. As a result, it is possible to clean while maintaining an appropriate amount of space between the fibers, thereby improving the efficiency of dust collection. [Explanation of Symbols]

[0039] 1…Cleaning sheet 2…Convex part 3…recess

Claims

1. Having multiple protrusions on at least one surface, It is made of a nonwoven fabric formed by the melt-blown method using a raw material which is a polypropylene resin blended with an olefin elastomer or styrene elastomer in a weight ratio of 1% to 30%. Cleaning wipes.

2. The aforementioned nonwoven fabric contains paraffin wax in a weight ratio of 0.3% to 5.0%. The cleaning sheet according to claim 1.

3. The aforementioned protrusion is formed by a repeating rectangular pattern. The cleaning sheet according to claim 1.

4. The average fiber diameter of the polypropylene resin constituting the nonwoven fabric is 1.0 μm or more and 10.0 μm or less. The cleaning sheet according to claim 1.

Images