JP2020151075A - Cleaning sheet - Google Patents

Abstract

To provide a fiber product using a nonwoven fabric having cleaning property while being thin.SOLUTION: In a nonwoven fabric, which is a nonwoven fabric containing a polyester fiber of a flat multi-lobar type having six or more convex parts on a circumference of a fiber cross section, a flatness of the flat multi-lobar type polyester fiber is 2.0-3.0, a deformity is 1.0-5.0 and a convex ratio is 0.6-0.9.SELECTED DRAWING: None

Description

The present invention relates to a cleaning sheet, and more particularly to a cleaning sheet having excellent wiping performance despite being thin.

Conventionally, cleaning sheets have been made of woven cloth, paper, non-woven fabric, etc. as a base material, and wet cloth to which a surfactant or the like is attached, a chemical miscellaneous cloth to which an oily component such as mineral oil is attached, and an adhesive. Adhesive sheets and the like using the above are known, and have been widely used in suitable cleaning applications.

Especially in recent years, the use of cleaning flooring floors for home or business use has been increasing, but on flooring floors, various types of dust and debris such as hair are easily noticeable, and frequent cleaning is required, so cleaning can be done easily. Sheets are being sought after.

Generally, when cleaning flooring floors, it is possible to collect and remove a wide range of dust, from fine dust such as dirt and soot to medium-sized dust such as cotton dust and large dust such as hair and animal hair. is necessary. For this reason, for example, a wet cloth or a chemical cloth can collect fine dust, but the performance of collecting large dust such as hair is inferior, and the adhesive sheet can collect dust of a wide range of sizes, but is adhesive. If dust adheres to the surface where the agent is applied, the dust collection effect will be significantly reduced, and the sheet must be replaced frequently. All cleaning sheets have a satisfactory effect on cleaning the flooring floor. It wasn't done.

Therefore, in order to solve these problems, a dry or wet cleaning wiper having high dust collecting performance by having zones alternately patterned on the entire surface of the sheet by water flow confounding has been proposed (see Patent Document 1). .. However, the cleaning sheet of this proposal is processed by water flow confounding and the use of fine fibers makes the voids between the fibers very fine, and even if the collection of fine dust is good, hair etc. The ability to collect large dust is not sufficient.

Separately, as a flooring wiper with high collection performance of hair and the like adhering to a wet floor surface, the latent crimped fibers are made by passing high-temperature steam through a fiber web composed of moist heat-adhesive fibers and latent crimped fibers. A flooring wiper has been proposed in which the morphology is stabilized by expressing the crimping of the above and further adhering the intersection with the moist heat adhesive fiber (see Patent Document 2). However, in the flooring wiper of this proposal, even if the adhesive fibers are excellent in stabilizing the shape of the wiper, the latent crimp fibers are less likely to be deformed, so that the dust collecting ability is lowered. Further, since the wiper is a wet wiper, if dust accumulates on the surface of the wiper, there is also a problem that the dust adheres to the floor surface of the flooring.

By combining three-dimensional crimped raw cotton with different fineness and crimping ability to solve the above problems, we propose a cleaning sheet with excellent collection of hair and dust adhering to dry floors, etc. (See Patent Document 3). However, since the flooring sheet of this proposal uses three-dimensional crimped fibers, there is a problem that the non-woven fabric becomes thick and bulky.

Japanese Unexamined Patent Publication No. 2008-127688 JP-A-2009-78065 Japanese Unexamined Patent Publication No. 2013-176432

Therefore, an object of the present invention is to solve the above-mentioned problems, and by using at least a part of polyester fibers having a special deformed cross section to form a non-woven fabric, it is used for cleaning which is excellent in cleaning property even though it is thin. To provide a seat.

In order to solve the above problems, the present invention has found that a non-woven fabric having excellent cleanability can be obtained by using a polyester fiber having a specific fiber cross-sectional shape, and further diligently studied the present invention. Has been completed.

That is, according to the present invention, "a non-woven fabric containing a flat multi-leaf polyester fiber having 6 or more convex portions on the circumference of the fiber cross section, and the flat multi-leaf polyester fiber is described below ( A cleaning sheet characterized by satisfying 1) to (3) at the same time. "
・ Flatness (A / B) = 2.0 to 3.0 ・ ・ ・ (1)
・ Deformity (C / D) = 1.0 to 5.0 ・ ・ ・ (2)
-Convex ratio (E / B) = 0.6 to 0.9 ... (3)
A: Maximum length of the cross section of the fiber B: Maximum width of the cross section of the fiber C: Length of the line connecting the apexes of adjacent convex portions in the maximum uneven portion of the cross section of the fiber D: Line between the convex portions Length of perpendicular line drawn from C to the low point of the recess E: Length that is the longest except for the maximum width B in the cross section At that time, the single fiber fineness of the flat multileaf fiber must be within 2.0 dtex. preferable. Further, according to the present invention, there is provided a cleaning sheet made of the above-mentioned non-woven fabric.

According to the present invention, a cleaning sheet having excellent cleanability despite being thin is provided.

FIG. 1 is a cross-sectional view for exemplifying the cross-sectional shape of a flat multi-leaf polyester fiber having a plurality of (8) convex portions on the circumference of the fiber cross section.

The cleaning sheet of the present invention is made of a non-woven fabric containing a flat multi-leaf type polyester fiber (flat multi-leaf type polyester fiber) having 6 or more convex portions on the circumference of the fiber cross section.

The polyester constituting the polyester-based fiber used in the present invention is a polymer polymer produced by a condensation reaction of terephthalic acid and ethylene glycol or butylene glycol, and sebacic acid, adipic acid, trimellitic acid, isophthalic acid and paraoxybenzo. It means a condensate of odoric acid and the like with ethylene glycol and butylene glycol, and a polyester polymer containing other polyesters. Of these, a polymer polymer produced by the condensation reaction of terephthalic acid and ethylene glycol, that is, polyethylene terephthalate is preferable.

The flat multi-leaf polyester fiber used in the present invention is a flat fiber having a convex portion having a cross-sectional shape of 6 or more.

The flat multi-leaf polyester fiber used in the present invention is a flat polyester fiber having a cross-sectional shape of 6 or more convex portions. If the number of convex portions existing in a circumferential shape in the cross-sectional shape is less than 6, the number of voids formed between adjacent fibers is reduced, and the cleanability is lowered. Further, since the cross-sectional shape is flat, it is possible to form voids between the fibers, and excellent bulkiness can be obtained.

FIG. 1 shows an example of the cross-sectional shape of a single fiber of a flat multi-leaf polyester fiber used in the present invention. FIG. 1 illustrates the cross-sectional shape of a flat multi-leaf polyester fiber included in the nonwoven fabric of the present invention having a plurality of (8) convex portions on the circumference of the fiber cross section.

In the present invention, a flat polyester fiber having 6 or more convex portions is used in the cross-sectional shape thereof, but the number is preferably 8 or more, and more preferably 10 or more. The upper limit of the number of convex portions is preferably 12.

The flat multi-leaf polyester fiber used in the present invention has the flat multi-leaf cross-sectional shape in the cross section of the single fiber having the flatness of the following formula (1), the degree of deformation of the following formula (2), and the following formula (3). ) Is a polyester fiber that simultaneously satisfies the convex portion ratio.
・ Flatness (A / B) = 2.0 to 3.0 ・ ・ ・ (1)
・ Deformity (C / D) = 1.0 to 5.0 ・ ・ ・ (2)
-Convex ratio (E / B) = 0.6 to 0.9 ... (3)
That is, according to a preferred embodiment of the nonwoven fabric in the present invention, the flat multi-leaf polyester fiber used for the nonwoven fabric has a maximum length of A in cross section, a maximum width of B, and adjacent convex portions in the maximum uneven portion. The length of the line connecting the apex is C, the length of the perpendicular line drawn from the line connecting the apex of the convex portion to the bottom point of the concave portion is D, and is the longest except for the maximum width B of the cross section. When the length is E, the flatness of the above formula (1), the degree of deformation of the above formula (2), and the above formula (3) are satisfied at the same time.

In the present invention, when the flatness (A / B) is less than 2.0, the voids formed between the fibers become small and the cleanability is lowered. On the other hand, when the flatness (A / B) exceeds 3.0, the feeling of elasticity is small, the settling is easy, and the bulk is hard to come out. In addition, the silk-reeling property tends to deteriorate and the degree of deformation tends to deteriorate. The flatness (A / B) is preferably 2.0 to 2.7, and more preferably 2.0 to 2.5.

Further, the degree of deformation (C / D) represents the size of the concave portion between the convex portions in the above-mentioned flat multi-leaf shape, and when the value is large, the concave portion is small and the value is small. And the recess means that it is large. As the degree of deformation (C / D) increases, the recesses become shallow and the voids formed between the fibers become smaller, so that the cleanability tends to decrease. Therefore, the degree of deformation (C / D) is 5.0 or less. On the other hand, if the degree of deformation (C / D) is too small, the concave portion of the fiber cross section tends to bend easily, and the flat shape tends to be unable to be maintained. From these facts, the degree of deformation (C / D) is 1.0 or more. The degree of deformity (C / D) is in the range of 1.0 to 5.0 from the above points. Further, the degree of deformation (C / D) is more preferably 2.0 to 4.0 from the viewpoint of cleanability.

Further, the convex portion ratio (E / B) has a meaning as an index for measuring the degree of distortion of the substantially elliptical shape obtained when drawing a line connecting the convex portion vertices of the maximum widths B and E and the maximum length A. Have. If the convex portion ratio is too small, the depth of the concave portion is reduced, and the cross-sectional shape thereof is infinitely similar to a flat cross shape. Therefore, the empty wall ratio between the fibers is lowered, the bulkiness of the non-woven fabric is lowered, and the cleanability is lowered. Therefore, the convex portion ratio is preferably 0.6 or more.

On the other hand, when the convex portion ratio is too large, when the irregularities between the fibers are fitted, the porosity is lowered by increasing the number of portions where the concave portions are completely closed, and the dust retention is lowered. From this, the convex portion ratio (E / B) is preferably 0.9 or less. The convex portion ratio (E / B) is preferably 0.6 to 0.9 from the above points. Further, the convex portion ratio (E / B) is preferably 0.6 to 0.8, more preferably 0.7 to 0.8, from the viewpoint of the balance.

The single fiber fineness of the flat multi-leaf polyester fiber used in the present invention is preferably 2.0 dtex or less. The single fiber fineness is more preferably 1.0 to 2.0 dtex, still more preferably 1.2 to 1.8 dtex. When the single fiber fineness exceeds 2 dtex, the rigidity peculiar to polyester fiber becomes strong, and the voids formed between the fibers become too large, so that the cleaning sheet has poor dust retention and dust falls from the non-woven fabric during use. Tend. Further, when the single fiber fineness is smaller than 1.0 dtex, the process passability in the card process is deteriorated and the productivity tends to be lowered.

Further, the fiber length of the flat multi-leaf polyester fiber used in the present invention is preferably 15 to 120 mm from the viewpoint of fiber loss of the non-woven fabric. The fiber length is more preferably 30 to 100 mm.

Further, the nonwoven fabric in the present invention may contain heat-sealing fibers as fibers different from the flat multi-leaf polyester fibers as long as the effects of the present invention are not impaired. By including the heat-sealing fibers in the non-woven fabric, the heat-sealing of the heat-sealing fibers can improve the morphological stability, which is one of the important functions when used in the wiping operation. As the heat-sealing fiber, a known heat-sealing fiber can be used, and a heat-sealing fiber composed of a single component may be used, but it is composed of two or more kinds of resin components including a portion that is not fused by heat treatment. It is a more desirable mode to use a composite type heat-sealed fiber such as a side-by-side type or a core-sheath type because the fiber strength is maintained by a portion that is not fused.

The components constituting the heat-sealed fiber include 6 nylon and polyethylene, polypropylene and polyethylene, polypropylene and ethylene-vinyl acetate copolymer, polyester and polypropylene, polyester and polyethylene, 6 nylon and 66 nylon, and high-density polyester. A combination of low density polyester and the like can be exemplified.

The method for producing a nonwoven fabric in the present invention will be described.

The above-mentioned flat multi-leaf polyester fiber is pre-opened and mixed with a heat-bonded fiber or an opener, and the fiber is made into a web with a card. The fibrous web formed of the curd is then sent by feed lattice to the spunlacing process, where it is subjected to high pressure water flow confounding and processed into a sheet. The non-woven fabric after the spunlacing process is sent to a drying step by a conveyor, and when the heat-treated fibers are used, the heat-treated fibers are simultaneously dried and heat-treated at a temperature at which only the heat-bonded fibers are melted by air through.

The non-woven fabric produced in this manner has a unique cross-sectional structure of the flat multi-leaf polyester fibers that compose it, and the fibers themselves retain dust and dirt. Therefore, even if the bulkiness is low, the non-woven fabric has high cleaning properties. Have. Therefore, the non-woven fabric is most suitable as a non-woven fabric for a cleaning sheet, which is the object of the present invention. That is, since the cleaning sheet obtained by cutting the non-woven fabric into an appropriate size has excellent cleaning property on a dry floor surface, dirt, dust, etc. can be firmly entangled. Further, since the voids on the sheet surface are not dense, the frictional resistance to the floor surface is also small, which facilitates the cleaning work. Further, the object of use of the cleaning sheet according to the present invention is not limited to the flooring floor, and can be used for general cleaning work for furniture, home appliances, cars, toilets, bathrooms, and the like.

Next, the cleaning sheet of the present invention will be described in detail by way of examples, but the present invention is not limited to the examples. Each physical property value in the example was measured by the following method, and was taken as an average value for 5 times of measurement.

<Test method for non-woven fabric thickness (bulky)>
A compression test of 5 layers of non-woven fabric with a basis weight of 40 g / m ² was repeated 5 times using KES-G5 manufactured by Katou Tech Co., Ltd. under the standard conditions of a pressure plate descent speed of 50 sec / mm and a pressure plate area of 2 cm ^2. Was performed, and the thickness at a compression load of 50 gf / cm ² was calculated (the average value of n = 5).

<Cleanability test method>
According to the Kaken-type wiping test method. 50 μl of a 15 wt% hexane diluent of diamond paste (ingredients: carbon black: 16.7%, beef tallow hydrogenated oil: 20.8%, liquid paraffin: 62.5%) was dropped onto a clean glass plate at room temperature. Hexane was air-dried to allow spot-like stains to adhere to the mixture. Silicon rubber (2 mm thick) is attached to a metal friction element (diameter 3 cm), and a non-woven fabric is further attached on the silicon rubber to form a test piece. The pressing load is 20 g / cm ² , the wiping speed is 10 cm / min, and the wiping distance is 6 cm. As a result, the dirt spots are wiped off by a linear motion, the dirt adhesion state before and after wiping is image-processed, classified into 5 stages according to the dirt density, and the area is measured. The higher the value, the higher the cleanability.

[Example 1]
Flat multi-leaf polyethylene terephthalate fiber (single fiber fineness 1.7 dtex, fiber) having a flatness of 2.7, a deformity of 4.0, a convex part ratio of 0.8, and a cross-sectional shape of 8 convex parts. (Length 51 mm) 100% by mass, a card fiber web with a grain size of 50 g / cm ² was prepared by a conventional method, the water pressure of the water jet was 50 kg / cm ² , the speed was 1 m / min, and the nozzle shape: 0.1 mmφ, 0. A sheet was prepared by double-sided processing with a pitch of 6 mm, 834 holes, and an effective width of 500 mm, and then heat-treated at 150 ° C. with an air through to obtain a non-woven fabric having a grain size of 40 g / m ² . The fiber composition of the non-woven fabric is shown in Table 1, and the evaluation results are shown in Table 2.

[Example 2]
Flat multi-leaf polyethylene terephthalate fiber (single fiber fineness 1.7 dtex, fiber) having a flatness of 2.7, a deformity of 4.0, a convex part ratio of 0.8, and a cross-sectional shape of 8 convex parts. (Length 51 mm) 100% by mass, a card fiber web with a grain size of 33 g / cm ² was prepared by a conventional method, the water pressure of the water jet was 50 kg / cm ² , the speed was 1 m / min, and the nozzle shape: 0.1 mmφ, 0. A sheet was prepared by double-sided processing with a pitch of 6 mm, 834 holes, and an effective width of 500 mm, and then heat-treated at 150 ° C. with an air through to obtain a non-woven fabric having a grain size of 26 g / m ² . The fiber composition of the non-woven fabric is shown in Table 1, and the evaluation results are shown in Table 2.

[Comparative Example 1]
A 100% by mass uniform of round cross-section polyethylene terephthalate fiber (single fiber fineness: 1.7 dtex, fiber length: 51 mm) having a flatness of 1.0 was prepared by a conventional method, and a card fiber web having a grain size of 50 g / cm ² was prepared by a conventional method. The water pressure of the jet is 50 kg / cm ² , the speed is 1 m / min, the nozzle shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm effective width, after making a sheet by double-sided processing, and then air-through at 150 ° C. Heat treatment was performed to obtain a non-woven fabric having a grain size of 40 g / m ² . The fiber composition of the non-woven fabric is shown in Table 1, and the evaluation results are shown in Table 2.

[Comparative Example 2]
Hollow polyethylene terephthalate fiber (single fiber fineness: 2.8 dtex, fiber length: 51 mm) with a flatness of 1.0 and a hollow ratio of 25% is 100% by mass, and a card fiber web with a grain size of 50 g / cm ² is commonly used. The water pressure of the water jet is 50 kg / cm ² , the speed is 1 m / min, the nozzle shape: 0.1 mmφ, 0.6 mm pitch, 834 holes, 500 mm, and the sheet is made by double-sided processing, and then air is further produced. Heat treatment was carried out at 150 ° C. through through to obtain a non-woven fabric having a grain size of 40 g / m ² . The fiber composition of the non-woven fabric is shown in Table 1, and the evaluation results are shown in Table 2.

As shown in Examples 1 and 2 and Comparative Examples 1 and 2, the non-woven fabric made of flat multi-leaf polyester fiber having a fiber structure having eight convex portions on the circumference of the fiber cross section has good cleanability. Yes, even if the thickness of the non-woven fabric became thin, high cleanability was maintained.

A: Maximum length of the cross section of the fiber B: Maximum width of the cross section of the fiber C: Length of the line connecting the apexes of adjacent convex portions in the maximum uneven portion of the cross section of the fiber D: Line between the convex portions Length of perpendicular line drawn from C to the low point of the recess E: The longest length excluding the maximum width B in the cross section

Claims (3)

It is a non-woven fabric containing a flat multi-leaf polyester fiber having 6 or more convex portions on the circumference of the fiber cross section, and the flat multi-leaf polyester fiber simultaneously performs the following (1) to (3). A cleaning sheet that is characterized by being satisfied.
Flatness (A / B) = 2.0 to 3.0 ... (1)
Deformity (C / D) = 1.0 to 5.0 ... (2)
Convex part ratio (E / B) = 0.6 to 0.9 ... (3)
A: Maximum length of the cross section of the fiber B: Maximum width of the cross section of the fiber C: Length of the line connecting the apexes of adjacent convex portions in the maximum uneven portion of the cross section of the fiber D: Line between the convex portions Length of perpendicular line drawn from C to the low point of the recess E: The longest length excluding the maximum width B in the cross section The cleaning sheet according to claim 1, wherein the single fiber fineness of the multi-leaf flat cross-section polyester fiber is 2.0 dtex or less. The cleaning sheet according to claim 1 or 2, wherein the fiber length of the flat multi-leaf cross-section polyester fiber is in the range of 15 to 120 mm.

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