JP7706220B2 - Manufacturing method of cleaning sheet - Google Patents

Description

The present invention relates to a method for producing a cleaning sheet.

Cleaning sheets for floor wipers are broadly divided into wet types (see Patent Document 1) and dry types (see Patent Document 2). Wet types are suitable for wiping up spills and for collecting fine dust such as sand and dirt, while dry types are suitable for collecting coarse dust such as fiber dust and hair.

JP 2018-068806 A JP 2013-176432 A

However, if a wet sheet is used before collecting the coarse dust, the chemicals can cause the coarse dust to stick to the floor surface, making collection difficult.

An object of the present invention is to provide a method for producing a wet-type cleaning sheet having high performance for collecting coarse dust such as fiber dust and hair.

In order to solve the above problem, the invention described in claim 1 comprises:
A method for producing a cleaning sheet made of a single layer of nonwoven fabric that is replaceably attached to a flat cleaning tool, comprising the steps of:
The cleaning sheet is made of hydrophilic fibers,
a wiper attachment portion provided at both ends in a cleaning direction when the wiper is attached to the cleaning tool;
a wet portion provided in the center in the cleaning direction and impregnated with a chemical solution;
and two hydrophobic dry sections provided between the wiper attachment section and the wet section,
The wet portion and the dry portion form a cleaning surface,
The cleaning sheet is entirely made of the hydrophilic fibers, and the dry portion is formed by impregnating the hydrophilic fibers with a water repellent agent in an amount of 1 to 3% by mass of the cleaning sheet.
In order to solve the above problem, the invention described in claim 2 is as follows:
A method for producing a cleaning sheet made of a single layer of nonwoven fabric that is replaceably attached to a flat cleaning tool, comprising the steps of:
The cleaning sheet is made of hydrophobic fibers,
a wiper attachment portion provided at both ends in a cleaning direction when the wiper is attached to the cleaning tool;
a wet portion provided in the center in the cleaning direction and impregnated with a chemical solution;
and two hydrophobic dry sections provided between the wiper attachment section and the wet section,
The wet portion and the dry portion form a cleaning surface,
The cleaning sheet is characterized in that the entire cleaning sheet is made only of the hydrophobic fibers, and the wet portion is formed by impregnating the hydrophobic fibers with a hydrophilic agent.

The present invention relates to a method for producing a cleaning sheet according to claim 1 or 2 , comprising the steps of:
A high fiber density region in the dry section;
The present invention is characterized in that a plurality of low fiber density regions are provided adjacent to the high fiber density region, and have a smaller amount of fibers accumulated than the high fiber density region.

According to the present invention, it is possible to provide a method for producing a wet-type cleaning sheet that has high collection performance for coarse dust such as fiber dust and hair.

FIG. 2 is a perspective view showing a state in which the cleaning sheet of the present embodiment is in use. FIG. 1 is a plan view showing an example of a cleaning sheet according to an embodiment of the present invention. FIG. 3 is an enlarged view of a portion T in FIG. 2 .

Specific aspects of a cleaning sheet 100 according to an embodiment of the present invention will now be described with reference to Figures 1 to 3. However, the technical scope of the present invention is not limited to the illustrated examples.
For convenience, the following description will be given with the X-direction, Y-direction, and Z-direction defined as shown in FIGS.

[Configuration of the embodiment]
FIG. 1 is a diagram showing a cleaning sheet 100 according to the present embodiment in use.
As shown in FIG. 1, the cleaning sheet 100 is a sheet that is replaceably attached to a cleaning tool 200 that includes, for example, a head portion 210 that is a substantially rectangular flat plate, and a rod-shaped handle portion 220 attached to the upper surface of the head portion 210.
The cleaning sheet 100 covers the bottom surface of the head portion 210 of the cleaning tool 200 to form a cleaning surface, and is folded along the longitudinal edge 211 of the head portion 210 of the cleaning tool 200, so that the wiper attachment portion 110 described later is engaged with the upper surface of the head portion 210 and attached.
The long edges 211 refer to edges along the long direction of the head portion 210. In other words, they refer to the two longer edges of the four edges of the rectangular head portion 210.

FIG. 2 is a plan view showing an example of the cleaning sheet 100 of the present embodiment.
As shown in FIG. 2 , when the cleaning sheet 100 has a head portion 210 of a general size (100 mm (width in the X direction) × 250 mm (width in the Y direction)), for example, assuming that the width in the X direction of the head portion 210 is a, the thickness is b, and the width in the Y direction is c, the suitable range of the width A in the X direction of the cleaning sheet 100 is expressed by the following formula:
a+2b+a/2<=A<=2a+2b (mm)
If A is less than the left-hand side value, it is difficult to attach the cleaning sheet 100 to the head unit 210, and the cleaning sheet 100 tends to come off during cleaning. If A exceeds the right-hand side value, the area not used for cleaning becomes large, and the cleaning sheet 100 interferes when the cleaning tool 200 is laid down for use.
The preferred range of width C of the cleaning sheet 100 in the Y direction is expressed by the following formula:
c <= C <= c + 60
If C is less than the left-hand side value, the head portion 210 is exposed from the cleaning sheet 100, making it unsuitable for cleaning. If C exceeds the right-hand side value, too much of the cleaning sheet 100 protrudes from the head portion 210 in the Y direction, making it difficult to clean corners of a room.
The cleaning sheet 100 further includes a wiper attachment portion 110, a dry portion 120, a wet portion 130, a dry portion 120, and a wiper attachment portion 110 from one end to the other end in the X direction which is the cleaning direction.

The material constituting the cleaning sheet 100 can be a nonwoven fabric manufactured using a known technique such as spunlace, air-through, air-laid, point bond, spun bond, or needle punch using a specified fiber as the fiber material.
The predetermined fibers may be natural, regenerated, or synthetic, and examples of the predetermined fibers include hydrophilic cellulose fibers such as rayon, lyocell, tencel, cotton, etc., hydrophobic polyolefin fibers such as polyethylene, polypropylene, polyvinyl alcohol, etc., polyester fibers such as polyethylene terephthalate, polybutylene terephthalate, etc., and polyamide fibers such as nylon, etc. These fibers may be used alone or in combination of at least one hydrophilic fiber and one hydrophobic fiber.
The fibers preferably have a fineness of 1.1 dtex to 5.5 dtex. If the fineness is less than 1.1 dtex, the pores between the fibers are small, which is not preferable for collecting fiber waste and hair. If the fineness is more than 5.5 dtex, the retained chemical solution tends to be released, which is not preferable.
Furthermore, the fiber length of these fibers may be any length suitable for production.

(Eye contact)
In the case of the cleaning sheet 100 of the present invention, the basis weight of the sheet is preferably 20 to 100 g/ ^m2 , and particularly preferably about 30 to 60 g/ ^m2 . If the basis weight of the sheet is less than 20 g/ ^m2 , the sheet will have poor dirt retention ability and will tend to wrinkle and become unstable during cleaning. If the basis weight exceeds 100 g/ ^m2 , the flexibility will be poor, making it difficult to attach the cleaning sheet 100 to the cleaning tool 200.

(Wiper mounting part)
The wiper attachment parts 110 are formed on both ends in the X direction, which is the cleaning direction of the cleaning sheet 100. When the cleaning sheet 100 is attached to the cleaning tool 200, the wiper attachment parts 110 are engaged with the upper surface of the head part 210, and are preferably formed, for example, 45 mm from the end in the X direction, and particularly 35 mm from the end. If they are formed at a distance of more than 45 mm, the cleaning sheet 100 may twist during cleaning, and the wiper attachment parts 110 may get into the cleaning surface, which is not preferable.
The wiper attachment portion 110 may be made of hydrophilic or hydrophobic fibers, or may be made of a mixture of hydrophilic and hydrophobic fibers.

(Dry section)
The dry part 120 is formed between the wiper attachment part 110 of the cleaning sheet 100 and the wet part 130 described later. During cleaning, this part mainly collects coarse dust such as fiber dust and hair. The width of the dry part 120 is preferably formed to be 25 mm to 45 mm, particularly 30 mm to 40 mm, in the X direction. If it is less than 25 mm, coarse dust such as hair collected by the dry part 120 will be caught in the wet part 130, stick to the floor surface, and easily fall off. If it exceeds 45 mm, the wet part 130 will be narrow and will not function sufficiently as a wet sheet.

(bending part)
In the cleaning sheet 100, the portions that are folded along the longitudinal edges 211 on both sides of the head portion 210 are referred to as folding portions S.
The approximate position of the bent portion S is set in advance to match the head portion 210 of the specified cleaning tool 200, and for example, when the cleaning sheet 100 is attached to the head portion 210, the bent portion S is located inside the dry portion 120 of the cleaning surface.
In order to allow the user to recognize the bend portion S, for example, a straight line corresponding to the bend portion S may be printed in advance on the dry portion 120, or a broken line corresponding to the bend portion S may be formed on the dry portion 120.
As a result, when the cleaning sheet 100 is attached to the cleaning tool 200, the dry part 120 comes into contact with both ends in the X direction and the longitudinal edges 211 of the head part 210. Therefore, during cleaning, the dry part 120 of the cleaning surface of the cleaning sheet 100 comes into contact with the floor surface first, making it possible to efficiently capture coarse dust particles.

The dry section 120 is made of hydrophobic or hydrophilic fibers, or both. When the dry section 120 contains hydrophilic fibers, a water repellent is applied to the dry section 120 to make it hydrophobic. This allows the dry section 120, which is located ahead of the wet section 130 that discharges the impregnating solution onto the surface to be cleaned, to capture coarse dust particles. Even if a spilled drink or the like comes into contact with the dry section 120, the penetration of moisture into the dry section 120 can be prevented.
The water repellent may be, for example, a fluorine-based or silicone-based agent, and the amount of application is preferably 1 to 3% by mass of the cleaning sheet 100. If it is less than 1%, the hydrophobicity is not fully exhibited, and if it is more than 3%, it may lead to the transfer of the water repellent agent to the floor surface, which is undesirable from the viewpoint of the living environment.
As a method for applying the water repellent, spray application is preferable because it allows for uniform application, but other methods, such as roll transfer using a flexographic printer or a gravure printer, may be used as long as they do not impair the effects of the present invention.

(High fiber density area/low fiber density area)
3, the dry section 120 preferably includes a high fiber density region 121 and a plurality of low fiber density regions 122 adjacent to the high fiber density region 121. Here, the high fiber density region 121 refers to a region with a large amount of accumulated fibers, and the low fiber density region 122 refers to a region with a small amount of accumulated fibers compared to the high fiber density region 121, and both regions are defined by the relative amounts of accumulated fibers.
The presence of sparsely and densely packed fiber portions in the dry section 120 makes it easier to collect hair, for example. Also, it makes it easier to block moisture penetration from the wet section 130.
The low fiber density region 122 preferably occupies 10% to 50% of the entire dry section 120. If it is less than 10%, the effect is poor, and if it exceeds 50%, it is undesirable because it leads to the falling off of fiber dust, a decrease in sheet strength, and deterioration of sheet wearability.

Methods for producing the fiber sparse and dense regions include, for example, embossing during sheet production to form high fiber density regions 121 compressed under high pressure and low fiber density regions 122 therebetween, and also hole punching.
Methods for forming holes in the dry section 120 include, but are not limited to, a method of forming holes in a fiber material by punching, a method of increasing the hole diameter of a suction roll that absorbs water when performing spunlace processing, and the like. The hole diameter Φ is preferably, for example, 0.3 to 2.0 mm. If it is less than 0.3 mm, the ends of coarse dust particles are difficult to collect, and if it exceeds 2.0 mm, it is likely to lead to re-detachment.

(Wet area)
The wet part 130 is formed in the center of the cleaning sheet 100 in the X direction and is impregnated with the chemical solution. During cleaning, it is a place where spills are wiped and fine dust such as sand and dust stains are collected. The width of the wet part 130 is preferably formed to be 40 mm to 80 mm, particularly 50 mm to 70 mm, in the X direction. If it is less than 40 mm, it is narrow as a wet part, and it is difficult to control the retention and release of the chemical solution, and it does not fully function as a wet sheet. Also, if it is more than 80 mm, the range of the dry part 120 and the bent part S becomes narrow, which easily leads to the detachment of the collected coarse dust.

Examples of the chemical solution impregnated into the wet section 130 include, but are not limited to, a solution of a lower alcohol such as ethanol, a surfactant or disinfectant such as benzalkonium chloride, and a solvent such as propylene glycol (PG) or propylene glycol monomethyl ether (PGME) dissolved in water.

(How to use the cleaning sheet)
Next, a method of using the cleaning sheet 100 will be described.
In use, the cleaning sheet 100 is attached to the head portion 210 of the cleaning tool 200 .
Specifically, the head part 210 is placed on the cleaning sheet 100 so that the longitudinal edge 211 of the head part 210 is aligned with the bent part S of the dry part 120. Next, the dry part 120 is folded along the longitudinal edge 211 of the head part 210, and the folded wiper attachment part 110 is engaged with the upper surface of the head part 210.
At this time, the dry section 120 abuts against the longitudinal edge 211 and both ends of the head section 210 in the X direction.

In this state, when the cleaning tool 200 is moved primarily in the X direction of the cleaning sheet 100, i.e., the cleaning direction, the dry part 120 first comes into contact with the floor surface and can capture coarse dust. Then, the wet part 130 passes over the floor surface, wiping up spilled drinks and capturing fine dust.

The present invention will be described in detail below with reference to examples, but the present invention is not limited to these.

[Sample Creation]
The cleaning sheet 100 was produced under the conditions of the following examples and comparative examples.

Example 1
(Sheet)
A hydrophilic sheet having a basis weight of 45 g/m ² and dimensions of 200 mm (width in the X direction) x 300 mm (width in the Y direction) was used, which was made by the spunlace method using rayon (line diameter 12 μm), PET (11.5 μm), and PP/PE (10 μm) as raw materials.

(Hydrophobic processing)
A fluorine-based water and oil repellent (UNIDYNE, water and oil repellent manufactured by DAIKIN) was sprayed onto the surface of the sheet in a band shape in the Y direction in a range of 35 mm to 65 mm on both sides from the center in the X direction, and two dry parts 120 with a width of 30 mm in the X direction were provided, and a wet part 130 with a width of 70 mm in the X direction was provided between them. In addition, the same area was embossed in advance with a pattern with a diameter of 2 mm and a height of 1 mm.

(Chemical application)
An impregnation solution was obtained by mixing 1% by mass of ethanol, 2% by mass of propylene glycol, 0.1% by mass of benzalkonium chloride, and 96.9% by mass of purified water. 200 g of the impregnation solution was impregnated into 100 g of the above sheet to prepare a test paper.

Example 2
The hydrophobic treatment was performed within a range of 40 mm to 65 mm on both sides from the center in the X direction of the sheet so that the width in the X direction of the wet portion 130 was 80 mm (the width in the X direction of the dry portion 120 was 25 mm on each side).
The other conditions were the same as in the first embodiment.

Example 3
The hydrophobic treatment was performed within a range of 20 mm to 65 mm on both sides from the center in the X direction of the sheet so that the width in the X direction of the wet portion 130 was 40 mm (the width in the X direction of the dry portion 120 was 45 mm on each side).
The other conditions were the same as in the first embodiment.

Example 4
The dry portion 120 was not embossed.
The other conditions were the same as in the first embodiment.

Example 5
The hydrophobic treatment was performed within a range of 45 mm to 65 mm on both sides from the center in the X direction of the sheet so that the width in the X direction of the wet portion 130 was 90 mm (the width in the X direction of the dry portion 120 was 20 mm on each side).
The other conditions were the same as in the first embodiment.

Example 6
The hydrophobic treatment was performed within a range of 15 mm to 65 mm on both sides from the center in the X direction of the sheet so that the width of the wet portion 130 in the X direction was 30 mm (the width of the dry portion 120 in the X direction was 50 mm on each side).
The other conditions were the same as in the first embodiment.

(Comparative Example 1)
No hydrophobic treatment was performed, and the dry section 120 was not provided.
The other conditions were the same as in the first embodiment.

(Comparative Example 2)
The entire surface was subjected to a hydrophobic treatment, and no wet portion 130 was provided.
The other conditions were the same as in the first embodiment.

[Test 1. Consideration of optimal width of wet and dry parts]
The following tests were carried out for Examples 1-6 and Comparative Examples 1-2.

[Evaluation method]
The test papers of each of the examples and comparative examples were attached to a cleaning tool 200 having a head portion 210 with a size of 100 mm (width in the X direction) x 250 mm (width in the Y direction) x 10 mm (thickness in the Z direction) and a slit for fixing the sheet at a position 20 mm in the X direction from the end of the upper surface.
Then, 0.3 g of 2 mm long lint and 10 cc of liquid (orange juice) were scattered on a hydrophobic floor surface, and the wiping test was carried out three times so as to straddle each of them, and the wiping performance of each test paper was evaluated.
The test results for the liquid were as follows: ⊚: almost complete wiping off; ◯: slight residue; △: significant residue; and ×: almost no wiping off.
Regarding lint, those that had 80% or more of the lint wiped off were marked with an ◎, those that had 40% or more but less than 80% of the lint wiped off were marked with an ◯, those that had 20% or more but less than 40% of the lint wiped off were marked with a △, and those that had less than 20% of the lint wiped off were marked with an ×.

The test results are shown in Table I. Note that in Table I, only (*) indicates the width of a single dry section 120.

[evaluation]
From the above results, it can be seen that the cleaning sheet 100 comprises a wet portion 130 impregnated with a chemical solution, which is provided in the center in the cleaning direction, and a hydrophobic dry portion 120 provided between the wiper attachment portion 110 and the wet portion 130, which are provided at both ends in the cleaning direction, and that the cleaning surface is formed by the wet portion 130 and the dry portion 120, making it possible to wipe away both fine dust and coarse dust.
In particular, it can be seen that if the width in the X direction of the wet portion 130 is 40 mm to 80 mm and the width in the X direction of the dry portion 120 is 25 mm to 45 mm, both fine dust and coarse dust can be effectively wiped away.
Furthermore, when Example 1 and Example 4 are compared, it is found that the wiping performance of the dry portion 120 is improved when the dry portion 120 is embossed.

[Effects of the embodiment]
As described above, according to this embodiment, the dry section 120 is provided so as to contact both ends in the X direction and the longitudinal edge 211 of the head section 210. Therefore, during cleaning, the dry section 120 comes into contact with the floor surface before the wet section 130, and can efficiently collect coarse dust such as fiber dust and hair.

In addition, since the wet section 130 impregnated with a chemical solution is provided in the center of the head section 210 in the X direction, cleaning can be completed with a single cleaning sheet 100 without compromising the basic functions of a wet sheet, such as removing spilled drinks and disinfecting, giving the user a sense of value.

In addition, because the dry section 120 is hydrophobic, even if it comes into contact with spilled drinks or the like before the wet section 130 does, it will not absorb the spilled drinks and become moist, and the efficiency of collecting coarse dust will not decrease.

In addition, while conventional wet sheets are impregnated with the chemical solution throughout the entire sheet, the cleaning sheet 100 of this embodiment only requires the chemical solution to be impregnated into the wet portion 130 at the center in the X direction, making it lightweight overall and inexpensive to manufacture.

The present invention has been specifically described above based on the embodiments, but the present invention is not limited to the above embodiments and can be modified without departing from the spirit of the invention.

For example, the structure of the cleaning sheet 100 described above is merely one example, and whether it is a single-layer sheet or a multi-layer sheet, as well as the fibers that make up the cleaning sheet 100, can be changed as appropriate.

Also, for example, the entire cleaning sheet 100 may be made of hydrophobic fibers such as polyethylene terephthalate, and the wet portion 130 may be subjected to a hydrophilic treatment by impregnating it with a hydrophilic agent. The hydrophilic agent may be a non-ionic surfactant (e.g., ester type, ether type, ester-ether type, etc.).
In this way, the step of applying a water repellent agent can be omitted in the manufacturing process.

Furthermore, the positional relationship between the dry section 120 and the wet section 130 is not limited to this embodiment, and for example, the dry section 120 may be provided at the end in the Y direction.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and its equivalents.

100 Cleaning sheet 110 Wiper attachment portion 120 Dry portion 121 High fiber density region 122 Low fiber density region 130 Wet portion 200 Cleaning tool 210 Head portion 211 Longitudinal edge portion 220 Handle portion S Bending portion

Claims (3)

A method for producing a cleaning sheet made of a single layer of nonwoven fabric that is replaceably attached to a flat cleaning tool, comprising the steps of:
The cleaning sheet is made of hydrophilic fibers,
a wiper attachment portion provided at both ends in a cleaning direction when the wiper is attached to the cleaning tool;
a wet portion provided in the center in the cleaning direction and impregnated with a chemical solution;
and two hydrophobic dry sections provided between the wiper attachment section and the wet section,
The wet portion and the dry portion form a cleaning surface,
the cleaning sheet is entirely made of the hydrophilic fibers, and the dry portion is formed by impregnating the hydrophilic fibers with a water repellent agent in an amount of 1 to 3% by mass of the cleaning sheet. A method for producing a cleaning sheet made of a single layer of nonwoven fabric that is replaceably attached to a flat cleaning tool, comprising the steps of:
The cleaning sheet is made of hydrophobic fibers,
a wiper attachment portion provided at both ends in a cleaning direction when the wiper is attached to the cleaning tool;
a wet portion provided in the center in the cleaning direction and impregnated with a chemical solution;
and two hydrophobic dry sections provided between the wiper attachment section and the wet section,
The wet portion and the dry portion form a cleaning surface,
a cleaning sheet manufacturing method comprising the steps of: manufacturing the cleaning sheet entirely from the hydrophobic fibers; and impregnating the hydrophobic fibers with a hydrophilic agent to form the wet portion. A high fiber density region in the dry section;
3. The method for manufacturing a cleaning sheet according to claim 1, further comprising forming a plurality of low fiber density regions adjacent to the high fiber density region, the low fiber density regions having a smaller amount of accumulated fibers than the high fiber density regions.

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