JPH04312430A - Cleaning sheet and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a cleaning sheet capable of surely acquiring and removing from fine dust to relatively large refuse. CONSTITUTION:A cleaning sheet 10 is laminated with a base sheet 11, a ground fabric 12 made of a nonwoven fabric integrally entangled with fibers, and a meshy sheet 14 made of a nonwoven fabric entangled with fibers having a fiber interval larger than that of the ground fabric 12 into a layer shape, they are partially connected, connection sections 13A of the base sheet 11, ground fabric 12 and meshy sheet 14 are recessed, and nonconnective portions 13B, 15B are protruded as a whole.

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 water rags that serve as 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 difficult to wipe it dry. Moreover, if the cleaning sheet is used in a dry state, there is a problem in that the collected dust tends to disperse from the cleaning sheet during cleaning.

[0004] Also, the so-called chemical rags that have been widely used in recent years solve the above problem by impregnating the fiber aggregate with an oil agent, but such chemical rags have poor dust adsorption power. This method relies on oil, and there are problems such as the oil transfers to the cleaning surface, adheres to the cleaning surface during cleaning, causes deterioration and discoloration of the surface to be cleaned, and furthermore, the oil adheres to the hands.

[0005] In order to solve these problems,
Japanese Patent Laid-Open No. 59-129285 discloses a chemical rag that suppresses the amount of oil that adheres to cleaning surfaces.
The publications disclose chemical wiping cloths that prevent uneven adsorption of oil agents by uniformly and efficiently impregnating the entire fiber, but these chemical wiping cloths are difficult to remove fine dust, etc. Although this method is effective, it has the problem that it cannot remove relatively large pieces of trash. That is, even if the effectiveness of wiping off fine dirt such as dust is improved, larger dust cannot be held due to the relationship between the adsorption force and the weight of the dust, resulting in some residue being left behind.

[0006] On the other hand, as a device for removing relatively large dirt, Japanese Patent Application Laid-Open No. 144156/1989 discloses a chemical mop that captures large dirt between mop cords and removes it. However, such chemical mops have the disadvantage that the mop cord is not completely supported, so that when the mop is lifted, dirt and the like may fall off.

[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 particles, and a method for manufacturing the same.

[0008]

[Means for Solving the Problems] The present invention provides a heat-shrinkable base sheet, a base fabric made of a non-woven fabric integrated by entangling fibers, and an entanglement of fibers having a larger fiber spacing than the base fabric. The base sheet, the base fabric, and the net-like sheet are laminated in this order, and the base sheet, the base fabric, and the net-like sheet are partially bonded, and the bonded portion is formed in a concave shape, and the non-bonded The above object has been achieved by providing a cleaning sheet whose parts are generally convex.

[0009] The present invention also provides a method for suitably manufacturing the above-mentioned cleaning sheet, comprising: a heat-shrinkable base sheet; a base fabric made of a nonwoven fabric integrated by entangling fibers; After layering a mesh sheet, which is a nonwoven fabric formed by entangling fibers with a larger fiber spacing than the base fabric, and then partially joining these sheets to integrate them,
The present invention provides a method for manufacturing a cleaning sheet, characterized in that the base sheet is heated and thermally shrunk to form a concave portion at the joint with the base fabric and the net-like sheet, and a convex shape at the non-joint portion. be.

0010

[Function] According to the cleaning sheet of the present invention, the convex portion at the joint of the base fabric flexibly contacts the cleaning surface, and the entangled fibers of the nonwoven fabric capture relatively fine cotton dust, etc.
Relatively large dirt and the like are captured and removed between the convex portions of the base fabric. Furthermore, larger pieces of dirt such as bread crumbs are entangled with and captured by the mesh sheet, and stiff and long items such as hair are captured by both the base fabric and the mesh sheet.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the embodiments shown in FIGS. 1 to 6.

As shown in FIGS. 1 and 2, the cleaning sheet 10 according to the embodiment of the present invention includes a base sheet 11, a base fabric 12 made of a nonwoven fabric integrated by entangled fibers, and a base fabric 12. On the outside of the base fabric 12, a net-like sheet 14, which is a nonwoven fabric formed by intertwining fibers with a larger fiber spacing than the base fabric 12, is laminated in layers and partially joined to form the base sheet, the base fabric 12, and the net-like sheet. The bonded portion 13A of the sheet 14 is concave, and the non-bonded portions 13B and 15B are generally convex.

[0013] The base fabric 12 has irregularities formed by a bonded portion 13A and a non-bonded portion 13B with the base sheet 11, with the bonded portion 13A having a concave shape and the non-bonding portion 13B having a convex shape. Note that the joint portion 13A is formed in a lattice shape, as shown in FIG.

Further, in the base fabric 12, as shown in FIGS. 1 and 2, the non-bonded portion 13B is formed as a convex portion 12A, and the bonded portion 13A is formed as a concave portion 12B. The base fabric 12 forms a cleaning surface with cushioning properties by a large number of convex portions 12A and concave portions 12B between them. Further, this cleaning surface is composed of entangled fibers, and these constituent fibers trap fine dust and the like adhering to the surface to be cleaned. At the same time, relatively large debris is trapped by being caught in the recessed portion 12B.

The base fabric 12 has each convex portion 12A as shown in FIG. 6 as a cleaning sheet 40 according to another embodiment.
A structure may be adopted in which each of the slit-shaped openings 12C is provided. By forming the openings 12C in this manner, relatively large debris that is difficult to capture by the constituent fibers can be taken into the interior of each convex portion 12A through these openings 12C.

[0016] The size of the opening 12C is 1 to 100 mm.
2 is preferably formed. Its size is 1
If it is less than mm2, there is no point in providing the opening 12C, and if it exceeds 100 mm2, the trapped dirt will easily fall out, which is undesirable.

The ratio of the opening 12C to the cleaning surface is 5
A range of 60% is preferred. If this ratio is less than 5%, it will be difficult to capture dust, and if it exceeds 60%, the trapped dust will tend to fall off and workability will deteriorate, which is not preferred.

Furthermore, if a low tack adhesive is applied to the inner surface of at least one of the base sheet 11 or the non-bonded portion 13B of the base fabric 12, the adhesive will be captured through the opening 12C. It is possible to prevent litter from falling off. However, if the tackiness is too high, the film and the base fabric will adhere to each other in a planar manner during manufacture or use, and there is a risk that the dust-trapping function of the openings will not be exhibited. As such a low tack adhesive, a rubber-based adhesive, an acrylic-based adhesive, an olefin-based adhesive, or the like is suitable.

Note that the opening 12C is formed by forming the base fabric 12 into a sheet shape and then partially cutting it into slits.
Alternatively, it may be formed by punching, for example.

[0020] The joint portion 13A between the heat-shrinkable base sheet 11 and the base fabric 12 may be formed into the lattice shape described above, if the convex portion 12A is formed by the base fabric 12. It is not limited to this, but may be in any form; for example, a large number of X marks, dots, and square marks may be arranged in a scattered dot pattern, or a fence may be formed of a large number of parallel lines. It is preferable that the interval is 5 to 100 mm. When the distance is less than 5 mm, as will be described later, the convex portion 12A is caused by heat contraction of the base sheet 11.
If it exceeds 100 mm, it becomes difficult to form the convex portion 1.
2A is too large, which is unfavorable in terms of dust trapping performance and appearance.

An example of the base sheet 11 is a heat-shrinkable film (a heat-shrinkable synthetic resin sheet). 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, polyamide resins, 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 above-mentioned convex portions. and one that forms a concave portion is used.

[0022] Further, as the base sheet 11, non-woven fabrics may be cited as long as they have heat shrinkability, and sheets having elasticity such as sheets made of urethane may also be cited as base sheets. Can be done.

The thickness of the base sheet 11 can be appropriately set in consideration of its shrinkage force, the shape of the uneven portion depending on the shrinkage rate, the degree of unevenness, the workability of partial bonding with the nonwoven fabric, etc. can.

The base fabric 12 is not particularly limited as long as it is made of fibers that are entangled and integrated. This is because a material in which the constituent fibers are entangled with each other and has a higher degree of freedom than one in which the constituent fibers are fused or bonded together traps fine dust etc. between the fibers.

The constituent fibers of the base fabric 12 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, cupro, and rayon. Natural fibers such as cotton, natural fibers such as cotton, or blends thereof are used, but when the base sheet 11 and the base fabric 12 are bonded by heat treatment, it is preferable to use thermoplastic fibers. Further, 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.

[0026] The basis weight of the base fabric 12 can be appropriately set in consideration of the degree of entanglement of the constituent fibers, strength, workability, cost, etc., but it is preferably in the range of 30 to 150 g/m2. preferable. 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. Also,
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 for the fibers to entangle, making it difficult to capture fine dust etc., which is not preferable.

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

The mesh sheet 14 is a nonwoven fabric having a larger distance between fibers than the base fabric 12. The type and fineness of the constituent fibers are the same as those of the nonwoven fabric used as the base fabric, and it is preferable to entangle the fibers by applying a water stream or an air stream to the web. At this time, the degree of entanglement has a correlation with the ability to retain dust. In addition, the strength of the nonwoven fabric changes depending on the type of constituent fibers, physical properties, and basis weight. Furthermore, the inter-fiber distance defined by the following equation also greatly affects the strength of the nonwoven fabric. Note that the interfiber distance a(m) is calculated using the following equation 1.

[0029]

[Math 1]

[0030] Here, the volume V of the nonwoven fabric can be determined from the thickness and area when no load is applied. If the distance between the fibers is too large, the strength will be weakened, and if the distance between the fibers is too small, the degree of freedom of the fibers will decrease and the entanglement with relatively large solids such as bread crumbs will worsen. The distance between fibers of the base fabric 12 is 80 μm
In the following, the distance between the fibers of the net-like sheet 14 is 50 μm or more, and the distance between the fibers of the base fabric 11 and the net-like sheet must satisfy the following equation.

[0031]

[Math 2]

[0032] Furthermore, there is no limit to the opening of the mesh sheet 14, and the locations where the fibers are present and the locations where the holes are may be regular, or the constituent fibers of the nonwoven fabric may be present randomly. But that's fine. However, if the opening is too large, relatively large solids such as bread crumbs will not get entangled, and if the opening is too small, it may impede the wiping effect of the base fabric, so it is necessary to select the opening appropriately. be.

3 and 4 show a cleaning sheet 30 according to a modified example of the structure in which the base fabric 12 and the mesh sheet 14 are arranged on both sides of the base sheet 11. Components that are the same as those in the above-described embodiments are given the same reference numerals, and detailed explanations of those components will be omitted.

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

The present manufacturing apparatus 20 manufactures the cleaning sheet 40 shown in FIG. 6, which has the reticulated sheet 14 on only one side and has an opening 12C formed in the base fabric 12, as shown in FIG. It is configured. That is, as shown in FIG.
The base sheet 11, the base fabric 12, and the reticulated sheet 14 are each configured to be unwound from a roll. The roll-shaped base fabric 12 is unwound by a unwinding device 21.

The base fabric 12 fed out by the feeding device 21 is provided with a large number of striped openings 12C as shown in FIG. 6 by an opening machine 23 disposed on the downstream side of the feeding device 21. This shedding machine 23 includes a rotary die cutter 23A and an anvil roll 23B, and a large number of openings 12C are formed by the rotary die cutter 23A while the base fabric 12 passes between the rotary die cutter 23A and the anvil roll 23B. It's like this.

Further, the opening 12C may be formed immediately before being joined and integrated with the heat-shrinkable base sheet 11. When applying a low-tack adhesive to the base sheet 11 and the nonwoven fabric as the base fabric 12 on the joint surface to improve the retention of dust entering through the openings, the adhesive is applied to the base sheet 11 or the nonwoven fabric as the base fabric 12. Although it may be applied at the time of manufacturing the nonwoven fabric as the base fabric, in consideration of unwinding properties (blocking), it is preferable to apply it immediately before the base sheet 11 and the nonwoven fabric as the base fabric 12 are joined together.

The base sheet 11 is unwound from above by a guide roller 24A disposed downstream of the shedding machine 23, and is overlapped with the base fabric 12 that has been conveyed. A net-like sheet 14 is disposed below the base fabric 12 in correspondence with the base sheet 11, and is unwound from the bottom by a guide roller 24B and overlapped with the conveyed base fabric 12. It's like this.

The base sheet 11 and the net-like sheet 1 are superimposed on the base fabric 12 by guide rollers 24A and 24B.
4 are joined in a lattice shape as shown in FIG. 6 by a joining machine 25 disposed downstream of the guide rollers 24A and 24B. This joining machine 25 connects the base fabric 12 and the base sheet 11.
and are ultrasonically welded. That is, this joining 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. As shown in FIG. 6, these sheets 11, 12,
14 are joined to form a lattice-like joined portion 13A. Note that the welding machine 25 is not limited to the ultrasonic type, but may be of a heating type, etc., and such a type is appropriately selected depending on the processing speed and material selection.

The integrated base fabric 12, base sheet 11, and reticulated sheet 14 joined by the joining machine 25 are pulled out by a nip roll 26 disposed downstream of the joining machine 25 and delivered to a heat treatment device 27. It will be done. This heat treatment device 27 is for heat shrinking, and is formed as a heating chamber that heats the base sheet 11 to a temperature that causes it to heat shrink. Then, the integrated base fabric 12 and base sheet 1
1 passes through the heat treatment device 27, the base sheet 11
Only the non-bonded parts surrounded by the lattice-shaped joined parts 13A are heat-shrinked, and the convex parts 12 are formed on the base fabric 12.
A is formed to form a cleaning sheet 40 shown in FIG.

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 40 is wound up as a winding roll.

Therefore, according to this embodiment using the above manufacturing apparatus, the cleaning sheet 40 is manufactured as follows.

That is, first, the base fabric 12 is
1, the base sheet 11 is fed from above and the reticulated sheet 14 is fed from below on the downstream side in parallel with this. While the supplied base sheet 11 directly reaches the guide rollers 24A, 24B, the base fabric 12
passes through the opening machine 23 to the rotary die cutter 2
3A forms a striped opening 12C, which reaches the guide rollers 24A, 24B, and the base sheet 11, the mesh sheet 14, and the opened base fabric 12 are superimposed by the guide rollers 24A, 24B. The base sheet 11, the base fabric 12, and the mesh sheet 14 thus superimposed are ultrasonically welded in the welding machine 25, and are pulled out by the nip rolls 26, 26 and delivered to the heat treatment device 27. . In this state, the sheet is in a state as shown in FIG. 3 (FIG. 5 when the mesh sheet 14 is disposed on both sides). The integrated base sheet 11, base fabric 12, and reticulated sheet 14 are as follows: While passing through the heat treatment device 27, only the base sheet 11 undergoes heat shrinkage. As shown in FIG. 4), a convex portion 12A is formed in the non-bonded portion of the base fabric 12, and a cleaning sheet 40 is formed. This cleaning sheet 40 is pulled out from the heat treatment device 27 by the nip rolls 28, 28 and wound up as the winding roll 10 in the winding machine 29.

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

Example 1 A web of 1.5 denier, 51 mm polyester fibers (basis weight 100 g/m2) was formed using a conventional card, and the web was entangled by water needling so that the distance between the fibers was 6.
A 0μ base fabric 12, a 100μ mesh sheet 14, and a polyester biaxial shrink film 40μ as the base sheet 11 are bonded together using ultrasonic embossing in a rhombic pattern of 30° and 30mm on each side, and heat-shrinkable. Cleaning sheets (20 x 20
cm) was obtained.

[0046] The heat shrinkage rate was measured using Equation 3 below.

[0047]

[Math 3]

Example 2 Polypropylene fibers of 1.5 denier, 51 mm and rayon fibers of 1.5 denier, 51 mm were mixed in a ratio of 50/50, and a web was formed using a conventional card (basis weight 70 g/m2).
) and 2.5 cm at a pitch of 5 cm in the flow direction on a base fabric with an intertwined fiber distance of 60 μ by water needling.
, the pitch between adjacent slits was 1 cm. Further, a composite sheet was obtained using a mesh sheet made in the same manner with an inter-fiber distance of 100 μm. The sheet and polypropylene biaxial shrinkable film 30 μm were bonded together by ultrasonic embossing in a square pattern of 20 mm on each side, and heat treated to produce a cleaning sheet (20 x 20 cm) with a heat shrinkage rate of 80%.
) was obtained.

Example 3 A cleaning sheet having the same structure as that of Example 2 was obtained, except that the base sheet 11 was coated with a rubber-based adhesive material to a coating thickness of 15 μm. Comparative example 1
Comparative Example 1 was obtained by using only the base fabric and the base sheet in Example 1, which were integrated under the same conditions, but without the mesh sheet.

A dust collection experiment was conducted using the cleaning sheets obtained in Examples 1 to 3 and Comparative Example 1, targeting cotton dust, crumbs, and hair. The results are shown in Table 1 below.

[0051]

[Table 1]

As is clear from the results shown in Table 1, the cleaning sheets of the present invention (Examples 1 to 3) are effective against dust of different sizes, ie, cotton dust, crumbs, and hair. It is also possible to reliably capture objects. It can be seen that the base fabric coated with an adhesive (Example 2) is more effective in collecting dust. On the other hand, in the case of Comparative Example 1, although it has an effect of collecting cotton dust and hair, it is found that the property of collecting bread crumbs is insufficient.

The present invention is not limited to the embodiments described above, but can be modified in various ways without departing from the gist of the present invention.

For example, in the above-described embodiment, the base sheet and the base cloth are formed to have substantially the same dimensions, but the present invention is not limited to this. The base fabric may be formed to have a larger dimension than the base sheet so that it protrudes from the base sheet. In this case, the degree of freedom during cleaning is further increased and sufficient cleaning can be achieved.

[0055]

According to the cleaning sheet of the present invention, it is possible to reliably capture and remove everything from fine dust to relatively large pieces of dirt.

Furthermore, according to the cleaning sheet manufacturing method of the present invention, the cleaning sheet described above can be manufactured rapidly and stably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a cleaning sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the cleaning sheet shown in FIG. 1.

FIG. 3 is a cross-sectional view showing the sheet shown in FIG. 1 in a state before heat treatment.

FIG. 4 is a sectional view showing a cleaning sheet according to a modified example of the present invention.

FIG. 5 is a cross-sectional view showing the cleaning sheet shown in FIG. 4 in a state before heat treatment.

FIG. 6 is a sectional view showing a cleaning sheet according to another embodiment of the present invention.

FIG. 7 is a schematic diagram showing the entire manufacturing apparatus suitably used when manufacturing the cleaning sheet according to the embodiment shown in FIG. 6;

[Explanation of symbols]

10, 30, 40 Cleaning sheet 11 Base sheet 12 Base fabric 12A Convex part 12B Concave part 12C Opening 14 Reticulated sheet

Claims (4)

[Claims] Claim 1: A heat-shrinkable base sheet, a base fabric made of a nonwoven fabric integrated by entangled fibers, and a reticulated sheet that is a nonwoven fabric formed by entangled fibers with a larger fiber spacing than the base fabric. are laminated in this order, and the base sheet, the base fabric, and the net-like sheet are partially joined, and the joined part is formed in a concave shape, and the non-joined part is formed in a convex shape as a whole. A cleaning sheet characterized by: 2. The cleaning sheet according to claim 1, wherein a pair of base fabrics are arranged on both sides of the base sheet, and a net-like sheet is arranged on the outside of each base fabric. . 3. The cleaning sheet according to claim 1, wherein the base fabric has apertures formed in the non-bonded portion thereof. 4. A reticular sheet that is a nonwoven fabric formed by a heat-shrinkable base sheet, a base fabric made of a nonwoven fabric unified by entangled fibers, and entangled fibers with a larger fiber spacing than the base fabric. After overlapping these sheets in a layered manner, these sheets are partially joined and integrated, and then heated to heat-shrink the base sheet so that the joined part with the base fabric and the mesh sheet becomes concave and unjoined. A method for manufacturing a cleaning sheet, characterized in that a portion thereof is formed into a convex shape.