JPH08243065A - Cleaning sheet manufacturing method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for manufacturing a cleaning sheet that can satisfy both the required strength during cleaning and the degree of fiber freedom required for dust collection performance. SOLUTION: The mesh weight is 40 to 40 on each side of the mesh sheet.
After laminating 100 g / m ² of fibrous web, these are water-needed under low energy conditions, and the fibrous web laminated on one side of the reticulated sheet and the fibrous web laminated on the other side of the reticulated sheet. It is characterized in that it is entangled and integrated through the voids.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cleaning sheet for business use and households using a nonwoven fabric, and more specifically, a dry cleaning sheet for collecting various dusts. The present invention relates to a manufacturing method of.

[0002]

2. Description of the Related Art A chemical cleaning cloth for dry cleaning, which is a conventional cleaning article, is generally a woven cloth or a non-woven cloth impregnated with an oily substance. The dirt on the surface is adsorbed by the wetting of the oily substance and removed. A cleaning sheet using a non-woven fabric has a strong bonding between fibers by adhesion, fusion bonding, or stronger entanglement so that fiber waste is not generated or broken during cleaning. However, such a cleaning sheet adsorbs fine dirt such as dirt and dust due to wetting of the impregnated oily substance, but is satisfactory for collecting large dust such as cotton dust, lint, and hair. Not something to do.

[0003] In order to collect large dust such as cotton dust, lint and hair, entanglement with fibers having a high degree of freedom is necessary. Generally, a non-woven fabric formed by entanglement of fibers does not have fibers. The degree of freedom of the constituent fibers is higher than that of the non-woven fabric constituted only by adhesion or fusion, and the dust is highly scavenged due to the entanglement between the dust and the fibers. And, it is considered that the weaker the entanglement of the fibers is, the higher the collection property of dusts becomes. However, if the entanglement is too weak, the strength of the nonwoven fabric is significantly reduced, and the processability is deteriorated and the fibers are dropped. It will be easier.

Therefore, an object of the present invention is to provide a method for manufacturing a cleaning sheet which can satisfy both the strength required for cleaning and the degree of fiber freedom required for dust collection performance. .

[0005]

Means for Solving the Problems As a result of earnest studies to achieve the above object, the inventors of the present invention have found that a mesh sheet and a fibrous web are laminated, and water entangling (water needling) is performed.
It was found that the sheet obtained by the entanglement and integration by means of such as is suitable as a cleaning sheet. The present invention has been made based on the above findings, and after laminating a fiber web having a basis weight of 40 to 100 g / m ^{2 on} both surfaces of a mesh sheet, these are subjected to a water needling treatment under low energy conditions to obtain the mesh sheet. Of the fibrous web laminated on one side and the fibrous web laminated on the other side,
It is intended to provide a method for producing a cleaning sheet, which is characterized in that the mesh sheet is entangled and integrated through a gap.

Here, the breaking strength is a load value (first peak value when the tensile strength is measured) when the cleaning sheet starts to break when a tensile load is applied to the cleaning sheet, and the elongation is The elongation percentage of the cleaning sheet when the load value is 500 g / 30 mm is shown. Further, the entanglement coefficient is a scale representing the entangled state between the constituent fibers, in the nonwoven fabric-like fiber assembly of the cleaning sheet, the fiber orientation and the stress in the vertical direction-represented by the initial gradient of the strain curve, It can be said that the smaller the value, the weaker the entanglement between fibers. At this time, the stress is
The value obtained by dividing the tensile load value by the gripping width (width of the test piece at the time of measuring tensile strength) and the basis weight of the non-woven fiber assembly is shown, and the strain is the elongation.

Hereinafter, the cleaning sheet according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing an embodiment (example) of a cleaning sheet according to the present invention.
FIG. 2 is a sectional view showing another embodiment (embodiment) of the cleaning sheet according to the present invention. 3 and 4 (A), (B) and
(C) is a plan view of a mesh sheet that can be used as the cleaning sheet according to the present invention.

The cleaning sheet 1 of this embodiment comprises a mesh sheet 2 (or 12) and a fiber assembly 3, and as shown in FIGS. 1 and 2, one side or both sides of the mesh sheet 2 (or 12). In addition, the non-woven fabric-like fiber assembly 3 formed by the fiber entanglement of the fiber web is also entangled with the mesh sheet 2 (or 12) together with the entanglement between the constituent fibers. . The mesh sheet 2 is not limited to the grid-like net as shown in FIG. 3, but may be a perforated film 12 having a large number of pores as shown in FIGS. 4 (A) to 4 (C). It is not particularly limited as long as it is a carrier that has the above-mentioned, and the fiber web forming the fiber assembly 3 is integrated in an entangled state. For example, a coarse woven fabric having a relatively large texture space such as a gauze-like woven fabric, or a non-woven fabric having fiber voids which can be integrated in an entangled state by superposing fiber webs on one or both surfaces, It is used as the mesh sheet in the cleaning sheet of the present invention. 3 and 4, the shape of the holes formed in the reticulated sheets 2 and 12 can be variously modified, and the perforated film 12 or the like may have a round shape as shown in FIG. 4 (A). The shape may be a star shape as shown in FIG. 4 (B), or may be a combination of a round shape and a star shape as shown in FIG. 4 (C).

Materials for the reticulated sheets 2 and 12 include polyolefins such as polyethylene, polypropylene and polybutene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6, nylon 66, acrylonitrile and vinyl. , Vinylidene-based such as polyvinyl chloride,
It can be appropriately selected from polyvinylidene chloride and the like, or their modified products, alloys and mixtures thereof.

When the mesh sheet 2 shown in FIG. 3 is used, the mesh, wire diameter, distance between wires, hole diameter, hole pitch, hole pattern, etc. should be taken into consideration in consideration of partial entanglement with the non-woven fiber aggregate. Need to decide. Specifically, the wire diameter is 20
μm to 500 μm is preferable, and more preferably 100 μm.
It is m-200 micrometers. Also, the distance between the lines is 2 mm to 3
It is preferably 0 mm, more preferably 4 mm to 20 mm.
When the mesh sheet 12 which is the perforated film of FIG. 4 is used, the aperture diameter is preferably 4 mm to 40 mm, more preferably 8 mm to 20 mm. The gap between the openings is preferably 1 mm to 10 mm, more preferably 1 mm to 5 mm. Incidentally, when using other than the above as the mesh sheet, for example, when using the above-mentioned woven fabric, non-woven fabric, considering the partial entanglement with the non-woven fabric fiber aggregate,
It suffices to determine the pore size, fiber voids, and the like.

The fibers used in the fiber assembly 3 are:
Polyester-based, polyamide-based, polyolefin-based thermoplastic fibers or composite fibers thereof, split fibers or ultrafine fibers produced by the melt blown method, semi-synthetic fibers such as acetate, cupra, regenerated fibers such as rayon, or Any natural fiber such as cotton may be used, or a mixed cotton thereof may be used.

The basis weight of the non-woven fiber aggregate is 40 to 1
00 g / m ² is preferred. The weight of this fiber assembly is 40
When it is less than g / m ² , when used as a cleaning sheet, dusts are likely to escape to the back side of the sheet, and the hands and the like may be soiled during cleaning. In addition, the basis weight of the fiber aggregate is 100 g
When it exceeds / m ² , the fiber and the mesh sheet are not sufficiently entangled with each other at the desired entanglement coefficient, which deteriorates the processability and makes it possible to obtain a cleaning sheet in which the fiber easily falls off.
The fineness, fiber length, cross-sectional shape, strength, etc. of the fibers used in the non-woven fiber assembly are determined by comprehensively considering processability, cost and the like. Further, the nonwoven fabric-like fiber aggregate is appropriately added according to the required function, such as a surfactant for improving the surface properties and adsorbing dusts, an oil agent, or an oil agent for imparting gloss to the surface to be cleaned. Good.

The cleaning sheet of the present invention obtained from the mesh sheet and the fiber assembly has a breaking strength of 500 g.
It is important that the elongation under a load of / 30 mm or more and 500 g / 30 mm is 10% or less, and that the confounding coefficient is 10 to 500 m. When the breaking strength is less than 500 g / 30 mm, the cleaning sheet may be broken during the wiping operation, and the elongation of the cleaning sheet is preferably low.
If the elongation under a load of 00 g / 30 mm exceeds 10%, the cleaning sheet will be distorted during the wiping operation and will be twisted, resulting in poor usability. These problems are particularly noticeable when the cleaning sheet is attached to a tool such as a mop and the cleaning operation is performed.

Further, when the entanglement coefficient represented by the initial gradient of the stress-strain curve in the fiber orientation and the direction perpendicular to the fiber orientation is set to be 500 m or less as in the cleaning sheet of the present invention, the above is obtained only with the fiber assembly. It is difficult to achieve the values of breaking strength and elongation, and in order to achieve such values, it is important to entangle and integrate the mesh sheet and the fiber assembly as in the present invention. Further, in the same low entangled state, the cleaning sheet of the present invention is entangled and integrated with the reticulated sheet in the cleaning sheet of the present invention, as compared with the entangled sheet consisting of the fiber aggregate alone, thereby, Since the elongation is kept low, the fibers are in a state of being significantly suppressed from falling off.

When the entanglement coefficient is less than 10 m, the interfibers and the fibers and the mesh sheet are not sufficiently entangled with each other, so that a non-woven fabric in which the fibers easily fall off can be obtained. Further, if the above entanglement coefficient exceeds 500 m, the degree of fiber freedom cannot be said to be sufficient because the entanglement is too strong, and it becomes difficult for the fibers to entangle with the dusts, and the dust collection performance deteriorates. The degree of entanglement between fibers is determined by the entanglement energy applied to the fiber web during the entanglement treatment. For example, in hydroentanglement (water needling), the type of fiber, the basis weight of the fiber web, the number of water jet nozzles and the water pressure,
The entanglement energy applied to the fiber web can be controlled by the conditions such as the line speed.

Next, the method for manufacturing the cleaning sheet according to the present invention will be described in detail. FIG. 5 is an explanatory diagram of a cleaning sheet manufacturing apparatus according to the present invention. In the production of the cleaning sheet according to the present invention, firstly, the fiber web is laminated on one side or both sides of the mesh sheet, and in this state the fibers of the fiber web on one side of the mesh sheet and the fiber web on the other side of the mesh sheet by water flow or the like. The fibers and the fibers of the fibrous web and the mesh sheet are entangled and integrated, and at the same time, each fiber web is fixed to the mesh sheet as a non-woven fiber aggregate by entanglement.

For example, FIG. 5 shows an example of a cleaning sheet manufacturing apparatus according to the present invention, which is used when manufacturing the cleaning sheet shown in FIG. As shown in FIG. 5, the fibrous web 3 is continuously fed from each of the card machines 5 and 5 for producing the fibrous web 3 through the feeding roll 7. On the other hand, a supply roll 6 for the reticulated sheet 2 is arranged between the card machines 5, 5, and the reticulated sheet 2 is delivered from a delivery roll 8 of the supply roll 6.

Then, the fiber aggregates 3 are superposed on the reticulated sheet 2 by the feeding rolls 7 on both sides of the reticulated sheet 2, and are carried into the water needling device 4. Here, the fibers of the fibrous web 3 are entangled with the reticulated sheet 2 and the fiber webs 3 and 3 on both sides of the reticulated sheet 2 are entangled by a jet water flow. The entangled fiber assembly 3 and the net-like sheet 2 are passed through a nip roll 9 and carried into a heating device 10 for drying or the like to be heat-treated. The heat-treated sheet is wound around the winder 13 via the nip roll 11. Thereby, the cleaning sheet according to the present invention is manufactured.

[0019]

EXAMPLES Next, the present invention will be specifically described based on the following examples. About Examples and Comparative Examples (1) to
The test evaluation of (6) was performed, and each evaluation result is shown in Table 1 below. Needless to say, the present invention is not limited to the following examples.

Test Method (1) Breaking Strength (Lateral Strength) A sample having a width of 30 mm was cut out in the direction perpendicular to the fiber orientation of the sheet, and then this sample was tested by a tensile tester for 100%.
Gripping at a chuck distance of mm, 3 in the direction perpendicular to the fiber orientation
When the sheet was pulled at a speed of 00 mm / min and the sheet started to break, the load value (the first peak value of the continuous curve obtained by this measurement) was measured as the breaking strength.

(2) Elongation under a load of 500 g / 30 mm The elongation of the sample was measured at the load value of 500 g in the breaking strength measurement. In addition, distortion when using this elongation,
The evaluation was performed according to the following three stages from the viewpoint of usability due to twisting. ◯: No problem such as distortion and twisting. Δ: Distortion, twisting, etc. may occur and it is rather difficult to use. X: Distortion, twisting and the like are likely to occur and are difficult to use.

(3) Entanglement coefficient A sheet-like non-woven fiber aggregate (excluding the mesh sheet portion)
In the vertical direction, and the fiber orientation is 15 mm wide.
After cutting out the pull, this sample was tested by a tensile tester.
Gripping with a chuck distance of 50 mm, and the direction perpendicular to the fiber orientation
To pull the sheet at a speed of 30 mm / min against the elongation of the sheet.
The tensile load value is measured. And the tensile load value F
[G] is the sample width [m] and the mesh of the non-woven fiber aggregate
With W [g / m ²] The value obtained by dividing by
-Determine the strain (elongation) curve. Stress S [m] = (F / 0.015) / W

In a non-woven fabric fiber assembly consisting only of entanglement of fibers, a linear relationship is established at the initial stage of this stress-strain (elongation) curve, and the inclination of this straight line is determined as an entanglement coefficient E [m]. For example, stress-strain (elongation) as shown in FIG.
In the curve, if the proportional limit is P, the stress at this P is S _P , and the strain (elongation) is γ _P , the confounding coefficient is E
= S _P / γ _P ( _SP = 60m, γ = 86%
Then E = 60 / 0.86 = 70 m. However, since this OP may not be a straight line in a strict sense, it needs to be approximated to a straight line in that case.

(4) Fiber drop-off property A mechanical friction test was carried out, and the amount of fibers dropped out was used to evaluate the following three levels. ◯: There is no problem because it does not fall off. △: Can be used although it falls off slightly. X: It is considerably dropped and cannot be used.

(5) Dust collecting property As the model dust, the collecting property of cotton dust (cotton, polyester cotton) and hair was evaluated according to the following four grades. ⊚: Collectability without any problem. ◯: Collectability with almost no problem. Δ: Collected, but much remains. X: Almost no collection.

(6) Dust strike-through property As model dust, JIS test dust 7 types 0.5 g
When the sheet was collected with a sheet area of 60 cm ² , the degree of dust coming out to the back side was evaluated according to the following three grades. ◯: No strikethrough at all. Δ: Some strikethrough X: Quite clear through.

Example 1 A polypropylene net (distance between wires 9 mm, wire diameter 0.2 mm) was used as the mesh sheet, and polyester fiber was 1.5 denier as the fiber assembly.
1 mm was laminated on the upper and lower layers of the reticulated sheet so as to form a fiber web having a basis weight of 48 g / m ² with a conventional card, and then water needling treatment was applied under low energy conditions to obtain a breaking strength of 1320 g / 30 mm and a load of 500 g / 30 mm. A sheet having an elongation at time of 4% and an entanglement coefficient of 70 m was obtained.

Example 2 Polypropylene net (distance between wires 9 mm, wire diameter 0.2 mm) was used as the mesh sheet, and polyester fiber was 1.5 denier as the fiber assembly.
1 mm was laminated on the upper and lower layers of the reticulated sheet so that a fiber web having a basis weight of 48 g / m ² was formed by a conventional card, and then water needling treatment was applied under low energy conditions (slightly higher than that of Example 1) to obtain breaking strength. 1500g / 30mm, 50
A sheet having an elongation of 4% under a load of 0 g / 30 mm and an entanglement coefficient of 320 m was obtained.

[Example 3] A polypropylene net (distance between wires: 9 mm, wire diameter: 0.2 mm) was used as a mesh sheet, and a polyester fiber of 1.5 denier was used as a fiber aggregate.
1 mm was laminated on the upper and lower layers of the reticulated sheet so that a fiber web having a basis weight of 35 g / m ² was formed by a conventional card, and then water needling treatment was applied under low energy conditions (equivalent to Example 1) to obtain a breaking strength of 1290 g. / 30mm, 500g /
A sheet having an elongation of 4% under a load of 30 mm and an entanglement coefficient of 130 m was obtained.

[Example 4] A polypropylene net (distance between wires: 9 mm, wire diameter: 0.2 mm) was used as a mesh sheet, and a polyester fiber of 1.5 denier was used as a fiber assembly.
1 mm was laminated on the upper and lower layers of the reticulated sheet so as to form a fiber aggregate having a basis weight of 120 g / m ² by a conventional card, and then water needling treatment was applied under low energy conditions (equivalent to Example 2) to obtain breaking strength. 1700g / 30mm, 500g
A sheet having an elongation of 4% under a load of / 30 mm and an entanglement coefficient of 240 m was obtained.

[Comparative Example 1] A polyester fiber of 1.5 denier and 51 mm was formed into a fiber web having a basis weight of 48 g / m ² using a conventional card, and a low energy condition (equivalent to Example 1).
Water needling treatment is applied to break strength 810
Elongation at g / 30mm, 500g / 30mm load 126%,
A sheet having an entanglement coefficient of 80 m was obtained. [Comparative Example 2] Polyester fiber 1.5 denier, 51 mm
Was formed into a fibrous web having a basis weight of 60 g / m ² using a conventional card, and subjected to water needling treatment under medium energy conditions, breaking strength of 2200 g / 30 mm, 500 g / 30 mm
A sheet having an elongation of 26% under load and an entanglement coefficient of 620 m was obtained.

[0032]

[Table 1]

As is clear from Table 1, in Comparative Examples 1 and 2 in which the mesh sheet is not composited, the elongation at a load of 500 g / 30 mm is set to 10% or less, and in order to improve the fiber drop-off property, more entanglement is required. It is necessary to strengthen the bonding, or to perform adhesion and fusion treatment. However, in such a case, the confounding coefficient becomes higher than that in Comparative Example 2, and the dust collecting property further decreases. If the basis weight of the non-woven fiber assembly of the sheet is lower than 40 g / m ² , dust strike-through occurs at the time of collecting dust, resulting in 100 g / m 2.
^When it is higher than ^{2, the} sheet becomes easy to drop fibers.

Therefore, in the cleaning sheet according to the present invention,
By combining a mesh sheet with a non-woven fiber aggregate to reduce the degree of entanglement, while maintaining the strength required for cleaning, cotton dust and lint that could not be collected by conventional cleaning sheets. It is possible to reliably collect a wide range of dusts by entangling large dusts such as hairs with fibers having a high degree of freedom.

EFFECTS OF THE INVENTION The cleaning sheet according to the present invention can satisfy both the strength required for cleaning and the degree of fiber freedom required for dust collection performance.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view showing another embodiment of the cleaning sheet according to the present invention.

FIG. 3 is a plan view of a mesh sheet that can be used as the cleaning sheet according to the present invention.

4 (A), (B) and (C) are plan views of a mesh sheet that can be used as the cleaning sheet according to the present invention.

FIG. 5 is an explanatory view showing an example of a cleaning sheet manufacturing apparatus according to the present invention.

FIG. 6 is a characteristic diagram of a stress-strain curve.

[Explanation of symbols]

 1 Cleaning Sheet 2, 12 Netted Sheet 3 Fiber Aggregate 4 Water Needling Device 5 Card Machine 6 Netted Sheet Supply Roll 7 Fiber Web Sending Roll 8 Netted Sheet Sending Roll 9, 11 Nip Roll 10 Heating Device 13 Winder

Claims (2)

[Claims] 1. A basis weight of 40 to 40 on both sides of a mesh sheet, respectively.
After laminating 100 g / m ² of fibrous web, these are water-needed under low energy conditions, and the fibrous web laminated on one side of the reticulated sheet and the fibrous web laminated on the other side of the reticulated sheet. A method for manufacturing a cleaning sheet, characterized in that the cleaning sheet is entangled and integrated through the voids. 2. The entanglement coefficient represented by the initial gradient of the stress-strain curve in the direction perpendicular to the fiber orientation in the nonwoven fabric-like fiber assembly in the cleaning sheet is 10 to 500 m.
The method for manufacturing a cleaning sheet according to claim 1, wherein