JPH04250130A - Sheet for cleaning and manufacture thereof - Google Patents

Abstract

PURPOSE:To surely catch and remove dust including fine dust and relatively large size dust and to make the manipulatability excellent. CONSTITUTION:A thermoshrinkable sheet 11 is partially joined to an unwoven fabric 12 which is integrally incorporated by crossing fibers each other and in which convex parts 12A are formed at un-joined parts. The outer surface of the unwoven fabric 12 is sued as a cleaning surface.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable cleaning sheet for commercial or household use.

0002

[Prior Art] Conventional cleaning sheets include simple sheet-like sheets made of woven or non-woven fabrics, chemical cloths, etc., and sheets made of string-like materials tied together like mops. These sheet-like materials or bundles of thread-like materials are used for cleaning in a dry or wet state. In addition, these cleaning sheets are
It is used for commercial purposes such as homes, offices, stores, buildings, and factories.

0003

[Problems to be Solved by the Invention] However, with conventional cleaning sheets, if used in a wet state, hands get dirty, and if dirty water remains on the surface of furniture or other furnishings, it is necessary to wipe it dry. Another problem is that when used in a dry state, the collected dust tends to disperse from the cleaning sheet during cleaning.

[0004] In addition, chemical rags solve the above problems by applying an oil to the fiber aggregate, but such chemical rags have the problem that the oil adheres during cleaning and alters the quality of the surface to be cleaned. There were problems such as discoloration, and furthermore, the oil could stick to the hands.

[0005] Furthermore, JP-A-56-38374 discloses a chemical rag that suppresses the amount of oil that adheres to the cleaning surface, and JP-A-59-129285 discloses a chemical rag that suppresses the amount of oil that adheres to the cleaning surface. In addition, chemical rags that prevent uneven adsorption of oil agents through efficient oil-impregnating treatment have been disclosed, but these chemical rags are effective in removing fine dust, etc., but they are relatively large in size. There was a problem that dust could not be removed, and there was a problem that there was a lack of versatility.

[0006] Furthermore, Japanese Patent Application Laid-Open No. 144156/1983 discloses a chemical mop that captures and removes large dirt between mop cords. Since the mop is not fully supported, there are problems such as dirt and the like falling off when the mop is lifted, a large amount of base material being required, and poor operability.

[0007] Accordingly, an object of the present invention is to provide a cleaning sheet that can reliably capture and remove everything from fine dust to relatively large pieces of dirt, and that also has excellent operability, and a method for manufacturing the same. .

[0008]

[Means for Solving the Problems] As a result of various studies on the structure of cleaning sheets, the present inventors found that the above object could be achieved by integrating a nonwoven fabric and a heat-shrinkable sheet and heat-treating them. did.

The present invention was made based on the above findings, and is made by partially joining a base sheet and a nonwoven fabric integrated by intertwining fibers, and the nonwoven fabric has convex portions in the non-joined portions. The present invention provides a cleaning sheet characterized in that a shaped portion is formed and the surface of the nonwoven fabric is used as a cleaning surface.

[0010] Furthermore, the present invention provides a method for suitably manufacturing the above-mentioned cleaning sheet, in which a heat-shrinkable sheet and a nonwoven fabric are partially joined to integrate these two sheets, and then the sheets are integrated. The present invention also provides a method for manufacturing a cleaning sheet, which comprises heating both sheets to heat-shrink the heat-shrinkable sheet to form a cleaning surface by providing a convex portion in the non-bonded portion of the non-woven fabric. It is something to do.

[0011]

[Function] According to the cleaning sheet of the present invention, the convex portions flexibly contact the surface to be cleaned, and the intertwined fibers of the nonwoven fabric capture fine dust, etc., and the convex portions are relatively Captures and removes large debris.

Furthermore, according to the method for manufacturing a cleaning sheet of the present invention, the cleaning sheet described above can be manufactured at high speed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the embodiments shown in FIGS. 1 to 12. In each figure, FIG. 1 is a plan view showing the non-woven fabric side showing a state in which a heat-shrinkable sheet and a non-woven fabric are overlapped at the initial stage of production of a cleaning sheet according to an embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along the line II-II, FIG. 3 is a view corresponding to FIG. 1 showing a state where the heat-shrinkable sheet shown in FIG. 1 and the nonwoven fabric are partially joined (in a lattice shape), and FIG. FIG. 5 is a cross-sectional view showing the cleaning sheet shown in FIG. 4, and FIG. 6 is a perspective view showing a part of the cleaning sheet of the embodiment of the present invention obtained by manufacturing the cleaning sheet shown in FIG. 4. FIG. 7 is a conceptual diagram showing the entire manufacturing equipment suitably used in this case.
8 and 9 are views corresponding to FIGS. 2, 3, and 5 when manufacturing a cleaning sheet according to another embodiment of the present invention, and FIGS. 10, 11, and 12 are views corresponding to another embodiment of the present invention. FIG. 2 when manufacturing a cleaning sheet of another example
, which corresponds to FIGS. 3 and 5. FIG.

As shown in FIGS. 1 to 6, the cleaning sheet 10 of this embodiment includes a heat-shrinkable sheet 11 as a base sheet.
and a nonwoven fabric 12 integrated by intertwining fibers are partially joined. The joint portion 13 where the heat-shrinkable sheet 11 and the nonwoven fabric 12 are partially joined is shown in FIG.
As shown, the entire structure is formed in a lattice shape.

Further, as shown in FIGS. 4 and 5, the non-woven fabric 12 has a convex portion 12A formed at a non-bonded portion with the heat-shrinkable sheet 11 surrounded by a lattice-shaped bonded portion 13. The portion 13 is formed as a concave portion 12B. The nonwoven fabric 12 forms a cushioning cleaning surface with a large number of convex portions 12A and concave portions 12B between them. Further, this cleaning surface is composed of intertwined fibers, and these constituent fibers trap fine dust and the like adhering to the surface to be cleaned.

[0016] The nonwoven fabric 12 also has each convex portion 12A.
12C of slit-shaped openings are provided in each of the convex portions 12, and relatively large dirt that is difficult to be captured by the constituent fibers is passed through these openings 12C to the convex portions 12.
It is configured to be taken into the inside of A. The size of the opening 12C is preferably 1 to 100 mm2. If the size is less than 1 mm2, there is no point in providing the opening 12C, and 10
If it exceeds 0 mm2, the captured dust will tend to fall off, which is undesirable. Moreover, the ratio of the opening 12C to the cleaning surface is preferably in the range of 5 to 60%. When this ratio is less than 5%, it becomes difficult to capture garbage, and 60%
If it exceeds %, the captured dust will tend to fall off and the processability will deteriorate, which is not preferable. Further, if a low-tack adhesive is applied to the inner surface of at least one of the non-bonded parts of the heat-shrinkable sheet 11 and the non-woven fabric 12, it is possible to prevent dirt and debris from being trapped through the opening 1C. It is possible to suppress the falling off. Note that the opening 12C is formed by forming the nonwoven fabric 12 into a sheet shape and then partially cutting it into slit shapes, but it may also be formed by punching out the nonwoven fabric 12, for example. In addition, when manufacturing nonwoven fabrics using the water needling method, when fibers of the web are entangled,
The opening 12C may be formed by using a coarse mesh for the support net.

Further, if the joint 13 between the heat-shrinkable sheet 11 and the nonwoven fabric 12 is formed so that the convex portion 12A can be formed by the nonwoven fabric 12,
It is not limited to the above-mentioned lattice-like structure, but may be in any form; for example, a large number of X marks, dots, and □ marks arranged in a scattered dot pattern, or a fence consisting of a large number of parallel lines. It may be formed into a shape with a length of 3 to 10
Preferably, the diameter is 0 mm. As will be described later, if the length is less than 3 mm, it will be difficult to form the convex portion 12A due to heat contraction of the heat-shrinkable sheet 11, and if it exceeds 100 mm, the convex portion 12A will become too large and trap dust. It is not desirable for doing so.

An example of the heat-shrinkable sheet 11, which is the base sheet, is a heat-shrinkable film (a sheet of heat-shrinkable synthetic resin). Examples of synthetic resins for forming such heat-shrinkable sheets include polyolefin resins such as polyethylene, polypropylene, and polybutene, polyester resins such as polyethylene terephthalate and polybutylene terephthalate, vinyl resins such as polyvinyl chloride, Vinylidene resins such as polyvinylidene chloride, modified products of these synthetic resins, composites of these synthetic resins, mixtures of these synthetic resins, etc., which shrink in uniaxial or biaxial directions to form the convex and concave portions. Those that form are preferably used. Moreover, a nonwoven fabric can also be cited as an example of the base sheet. As this nonwoven fabric, one whose constituent fibers are heat-shrinkable is preferably used. As another example, a sheet having elasticity such as a sheet made of urethane can also be used as the base sheet.

The thickness of the base sheet (heat-shrinkable sheet 11, nonwoven fabric, etc.) depends on its shrinkage force, the shape of the uneven portion depending on the shrinkage rate, the degree of unevenness, and the partial bonding with the nonwoven fabric. It can be set appropriately in consideration of workability and the like.

[0020] The nonwoven fabric 12 is not particularly limited as long as it is integrated by intertwining the fibers; Constituent fibers with a high degree of freedom are preferably used to trap fine dust etc. between the fibers. However, if the degree of freedom of the constituent fibers is too high, the constituent fibers may fall off, which is not preferable.

[0021] The constituent fibers include, for example, thermoplastic fibers such as polyester fibers, polyamide fibers, and polyolefin fibers, composite fibers of these fibers,
Semi-synthetic fibers such as acetate, recycled fibers such as cupro and rayon, or blends thereof are preferably used. These constituent fibers preferably have a high degree of freedom, but
In order to increase the strength of the nonwoven fabric, the constituent fibers may be partially fused or bonded.

The basis weight of the nonwoven fabric 12 can be appropriately set in consideration of the degree of entanglement of the constituent fibers, strength, workability, cost, etc., but is preferably in the range of 30 to 150 g/m2. If the basis weight is less than 30 g/m2, the degree of entanglement and strength will not be sufficient, and if it exceeds 150 g/m2, the cost may increase, which is not preferable. Further, the fineness of the constituent fibers is preferably in the range of 0.5 to 6.0 deniers. When the fineness is less than 0.5 denier, the web-forming ability of the fibers deteriorates, and when it exceeds 6.0 denier, it becomes difficult to entangle the fibers, making it difficult to capture fine dust, etc., which is not preferable.

The nonwoven fabric 12 may be surface-treated with a surfactant, oil, or low tack adhesive to improve its ability to absorb dust, or may be coated with a surface treatment as necessary. Those that have been appropriately surface-treated with an oil agent or the like that imparts gloss to the surface to be cleaned are preferably used.

Next, a preferred embodiment of the present invention for manufacturing the cleaning sheet 10 will be described together with its manufacturing apparatus.

As shown in FIG. 6, this manufacturing apparatus 20 produces a cleaning sheet 10 having a large number of openings 12C in the nonwoven fabric 12.
is configured to manufacture. That is, both the heat-shrinkable sheet 11 and the nonwoven fabric 12 are configured to be unwound from a rolled state. The roll-shaped heat-shrinkable sheet 11 is unwound by a first feeder 21, and the roll-shaped nonwoven fabric 12 is unwound by a second feeder 22. The first feeder 21 includes a pair of rollers 21A, 21A and both rollers 2.
1A and an endless belt 21B wrapped around 21A, the endless belt 2 is pressed against the roll-shaped heat-shrinkable sheet 11 by the rotational drive of one of the rollers 21A.
The heat-shrinkable sheet 11 is unrolled by rotating 1B. Moreover, the second supply machine 22
It is arranged above the supply machine 21, and this first supply machine 2
It includes a pair of rollers 22A, 22A and an endless belt 22B configured in the same manner as 1.

The nonwoven fabric 12 unwound by the second feeder 22 is provided with a large number of striped openings 12C as shown in FIG. 1 by an opening machine 23 disposed downstream of the second feeder 22. This opening machine 23 is a rotary die cutter 2
3A and an anvil roll 23B, and a large number of openings 12C are formed by the rotary die cutter 23A while the nonwoven fabric 12 passes between the rotary die cutter 23A and the anvil roll 23B.

The nonwoven fabric 12 in which the openings 12C are formed by the shedding machine 23 is overlapped with the heat-shrinkable sheet 11 that is unwound from below by a guide roller 24 disposed on the downstream side of the shedding machine 23. There is.

The nonwoven fabric 12 and the heat-shrinkable sheet 11 overlapped by the guide roller 24 are bonded by a bonding machine 25 disposed downstream of the guide roller 24 as shown in FIG.
They are joined in a grid pattern as shown in FIG. This joining machine 24 is configured to perform ultrasonic welding of the nonwoven fabric 12 and the heat-shrinkable sheet 11. That is, this bonding machine 25 is equipped with a horn 25A that emits ultrasonic waves and an embossing roll 25B having a mold formed in a lattice pattern. In Figure 3
As shown in FIG. 2, these two parts 11 and 12 are joined to form a lattice-like joined part 13. Note that the bonding machine 25 is not limited to the ultrasonic type, but may be of a heating type or the like.

The integrated nonwoven fabric 12 and heat-shrinkable sheet 11 joined by the joining machine 25 are pulled out by a nip roll 26 disposed downstream of the joining machine 15 and delivered to a heat treatment device 27. This heat treatment device 27
is formed as a heating chamber that heats the heat-shrinkable sheet 11 to a temperature that heat-shrinks it in biaxial directions. Then, while the integrated nonwoven fabric 12 and heat-shrinkable sheet 11 pass through the heat treatment device 27, only the heat-shrinkable sheet 11 is heat-shrinked in the non-joined portions surrounded by the lattice-shaped joints 13, and Convex portions 12A are formed on the nonwoven fabric 12 to form the cleaning sheet 10 shown in FIGS. 4 and 5.

The cleaning sheet 10 formed after passing through the heat treatment device 27 is pulled out by nip rolls 28, 28 disposed on the downstream side of the heat treatment device 27, and then passed through the winder 2.
9, the cleaning sheet 10 is wound up as a winding roll 10'.

Therefore, according to this embodiment using the above manufacturing apparatus, the cleaning sheet 10 is manufactured as follows.

That is, first, the heat-shrinkable sheet 11 is
When the nonwoven fabric 12 is fed by the feeder 21, the second feeder 22 feeds the nonwoven fabric 12 in parallel. While the supplied heat-shrinkable sheet 11 directly reaches the guide roller 24, the nonwoven fabric 12 passes through the opening machine 23 and is cut into striped openings 12C by its rotary die cutter 23A.
is provided and reaches the guide roller 24, where the heat-shrinkable sheet 11 and the opened nonwoven fabric 12 are superimposed by the guide roller 24. The heat-shrinkable sheet 11 and the nonwoven fabric 12 that have been superimposed in this way are transferred to a bonding machine 25.
After being ultrasonically welded and integrated, it is pulled out by nip rolls 26, 26 and transferred to a heat treatment device 27.
handed over to. While the integrated heat-shrinkable sheet 11 and non-woven fabric 12 pass through a heat treatment device 27, only the heat-shrinkable sheet 11 heat-shrinks to form convex portions 12A in the non-bonded portions of the non-woven fabric 12, and is then cleaned. It is formed as a sheet 10 for use. This cleaning sheet 10 has nip rolls 28, 28
is pulled out from the heat treatment device 27 and wound up in a winding machine 29 as a winding roll 10'.

Next, another embodiment of the cleaning sheet of the present invention will be described.

7 to 9 are diagrams showing a cleaning sheet 2 according to another embodiment of the present invention, and the cleaning sheet 30 of this embodiment is a heat-shrinkable base sheet as shown in each figure. The fiber sheet 31 and a nonwoven fabric 32 integrated by intertwining fibers are joined in a lattice shape, and the nonwoven fabric 32 has a convex portion 32A formed in the non-joined portion. In other words, the cleaning sheet 30 of this embodiment is different from the cleaning sheet 10 of the first embodiment in which the opening 12C is not provided in the convex portion 12A of the nonwoven fabric 12, except for this point. It is configured similarly to the cleaning sheet 10.

FIGS. 10 to 12 are diagrams showing cleaning sheets according to still other embodiments of the present invention, and the cleaning sheet 40 of this embodiment is similar to that of the second embodiment, as shown in each figure. Heat-shrinkable sheet 3 as a base sheet of the example cleaning sheet 30
A nonwoven fabric 42' is bonded to the other side of 1, and this nonwoven fabric 42'
A convex portion 42'A similar to the convex portion 42A of the nonwoven fabric 42 bonded to one side of the cleaning sheet 42'A is provided, and everything else is the same as the cleaning sheet 30 of the second embodiment described above. It is composed of

The cleaning sheet of the present invention will be explained below based on more specific examples.

Example 1

Polypropylene fiber [1.5 denier, 5
1 mm and rayon fiber (1.5 denier, 51 mm) in a ratio of 50/50, and made a web (basis weight 7
0g/m2) and entangled by water needling to obtain a nonwoven fabric. This non-woven fabric was coated with 2.5 cm at a pitch of 5 cm in the machine direction using the manufacturing equipment shown in Figure 6.
Cut a cm slit and set the pitch of adjacent slits to 1.
cm, and the nonwoven fabric and polypropylene biaxially shrinkable film of 30 μm were joined together by ultrasonic embossing in a square pattern of 20 mm on each side, and this was
The cleaning sheets shown in Table 1 (20
x 20 cm) were obtained as products 1 and 2 of the present invention. In Table 1, the presence or absence of an adhesive (SEBS type) indicates the presence or absence of treatment of the nonwoven fabric with an adhesive. In addition, a cleaning sheet made only of nonwoven fabric was obtained as Comparative Product 1. Then, the tests shown in Table 1 were conducted on products 1 and 2 of the present invention and comparative product 1, and the results (evaluation) of each were shown in Table 1.

[0039]

[Table 1]

Example 2

Polyester fiber (1.5 denier, 51
mm) using a conventional card to web (basis weight 100g/m2
) and entangled them by water needling to obtain a nonwoven fabric. This 40μ biaxial shrink film of nonwoven fabric and polyester was ultrasonically embossed to a size of 30mm on one side.
Integrate the joints in a 30° diamond pattern, and
The cleaning sheets (20 x 20 cm) shown in Table 2 below were obtained as Invention Products 3 to 5 by heat treatment at 120°C for 30 seconds, and the same tests as in Example 1 were conducted, and the respective results (evaluation) are shown in Table 2. It was shown to.

[0042]

[Table 2]

The cleaning sheet of the present invention is not limited to the above embodiments in any way, and all such cleaning sheets are included in the present invention as long as they do not depart from the gist of the present invention.

[0044]

Effects of the Invention The cleaning sheet of the present invention obtained by the cleaning sheet manufacturing method of the present invention can reliably capture and remove everything from fine dust to relatively large debris, and has improved operability. It is excellent.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the nonwoven fabric side of a cleaning sheet according to an embodiment of the present invention, showing a state in which a heat-shrinkable sheet and a nonwoven fabric are overlapped at the initial stage of production.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

3 is a view corresponding to FIG. 1 showing a state in which the heat-shrinkable sheet and nonwoven fabric shown in FIG. 1 are partially joined (in a lattice shape); FIG.

4 is a perspective view showing a part of a cleaning sheet according to an embodiment of the present invention obtained by heating the sheet shown in FIG. 3; FIG.

5 is a sectional view showing the cleaning sheet shown in FIG. 4. FIG.

FIG. 6 is a conceptual diagram showing the entire manufacturing apparatus suitably used when manufacturing the cleaning sheet shown in FIG. 4;

FIG. 7 is a sectional view corresponding to FIG. 2 when manufacturing a cleaning sheet according to another embodiment of the present invention.

8 is a plan view of the sheet shown in FIG. 7. FIG.

9 is a sectional view showing a part of a cleaning sheet according to another embodiment of the present invention obtained by heat-treating the sheet shown in FIGS. 7 and 8. FIG.

FIG. 10 is a view corresponding to FIG. 7 when manufacturing a cleaning sheet according to still another embodiment of the present invention.

11 is a plan view of the sheet shown in FIG. 10. FIG.

12 is a sectional view showing a part of a cleaning sheet according to still another embodiment of the present invention obtained by heat-treating the sheet shown in FIGS. 10 and 11. FIG.

[Explanation of symbols]

10, 30, 40 Cleaning sheet 11, 31, 41 Base sheet (heat-shrinkable sheet) 1
2, 32, 42 Nonwoven fabric 12A, 32A, 42A Convex portion 12C Opening portion 13, 33, 43 Joint portion

Claims (3)

[Claims] Claim 1: A base sheet and a nonwoven fabric integrated by intertwining fibers are partially bonded, and the nonwoven fabric has a convex portion formed in the non-bonded portion, and the surface of the nonwoven fabric is A cleaning sheet characterized by having as a cleaning surface. 2. The cleaning sheet according to claim 1, wherein the convex portion is provided with an opening. 3. After partially joining a heat-shrinkable sheet and a nonwoven fabric to integrate these two sheets, the integrated sheets are heated to heat-shrink the heat-shrinkable sheet to form the nonwoven fabric. A method for producing a cleaning sheet, comprising: forming a cleaning surface by providing a convex portion in a non-joined portion of the cleaning sheet.