JP4445368B2 - Cleaning sheet - Google Patents

Description

  The present invention relates to a sheet mainly used for flooring for home use or business use, as well as food debris such as cotton dust, bread crumbs, human hair and hair loss of pets such as dogs, cats, small birds, The present invention relates to a cleaning sheet capable of wiping away dirt dust and sand particles having a larger particle diameter.

  Conventionally, various nonwoven fabrics have been proposed as household cleaning sheets. For example, in Japanese Unexamined Patent Publication No. 2000-210238 (Patent Document 1), an inner layer as a nonwoven fabric and an outer layer having a density lower than the inner layer disposed on at least one surface of the inner layer and the constituent fibers forming a loop are formed by fiber entanglement. An integrated cleaning sheet has been proposed. Japanese Patent Laid-Open No. 2000-234253 (Patent Document 2) proposes a wiping material that jets a high-pressure water stream into two fiber layers having different heat-shrinkability to form apertures aligned in a line. ing. Japanese Patent Laid-Open No. 2002-369882 (Patent Document 3) proposes a cleaning sheet in which a non-woven fiber web is locally compressed to form a region having a high fiber density and a region having a low fiber density. Furthermore, Japanese Patent Laid-Open No. 2003-508 (Patent Document 4) proposes a nonwoven fabric wiper in which substantially flat portions and striped portions exist alternately.

JP 2000-210238 A JP 2000-234253 A JP 2002-369882 A Japanese Patent Laid-Open No. 2003-508

  Conventional cleaning sheets can wipe off fine indoor dust such as dust, human hair, dogs, and cat hair, but it is difficult to wipe off relatively large dust such as bread crumbs. there were. Furthermore, when living on a dirt foot, it has been difficult to clean away dirt dust and floor surfaces on which there are many sand grains having a larger particle size.

For example, the cleaning sheet described in Patent Document 1 needs to form a loop by once performing a water needling treatment under a low energy condition, and then loosening the nonwoven fabric surface with a brush or the like. In addition to the decrease, the stability of the quality may also decrease. Since the wiping material described in Patent Document 2 needs to be thermally shrunk to form a bowl-like material, it may be difficult to stably obtain a non-woven fabric having a basis weight of about 50 g / m ² . The cleaning sheet described in Patent Document 3 maintains strength and shape retention in a region where the fiber density is formed “dense”, and fine dust such as dirt dust in a region where the fiber density is formed “rough”. Attempts have been made to collect dust, but it was sometimes difficult to collect and hold dust of various sizes simply by forming a “rough” region. Furthermore, since the “rough” region is formed by jetting water flow from a plurality of holes, the ratio of the “rough” region to the entire sheet increases, and the “dense” region contacts the target surface. The area decreases, and the wiping property cannot be obtained sufficiently. The non-woven wiper described in Patent Document 4 has strength and shape stability at the striped portion, and attempts to increase the capturing property of dust, hair, etc. at the flat portion. It was difficult to collect and hold dust of various sizes.

  The present invention makes it possible to wipe off dusts of various sizes that cannot be sufficiently wiped off by conventional cleaning sheets, and live on dirt, as well as dust on floors, tatami mats, furniture, etc. An object of the present invention is to obtain a cleaning sheet that can wipe a wide range of dirt such as floors and sand particles having a large particle size.

As a result of intensive studies, the inventors have provided streak joints in the sheet, and the spacing between the streaks and the form of the card web between the streak joints, specifically, in the thickness direction of the sheet. Knowing that by making the state of a large degree of change in thickness when a load is applied, dust of various sizes can be wiped off and the wiped dust can be held in the sheet, the present invention has been achieved. That is, the cleaning sheet of the present invention is a laminated sheet in which a card sheet is disposed on at least one side of the support sheet and the support sheet, and the card web and the support sheet are integrated at a streak-joint portion. The streaky joints are entangled joints by water flow, and the distance between the adjacent streaky joints is within a range of 5 mm or more and 15 mm or less. Substantially three-dimensional entanglement treatment is not performed, and the thickness (T ₀ ) at the time of 2.94 cN / cm ² load in the laminated sheet is 0.8 mm or more, and at the time of 19.6 cN / cm ² load when the thickness was T _1, it 2.94cN / cm thickness during ² load (T ₀₎ thickness change ratio during 19.6cN / cm ² load on the (T ₁ / T ₀₎ is 0.9 or less It is characterized by.

In the cleaning sheet of the present invention, the card web and the support sheet are integrated at a streak joint portion, and an interval between the adjacent streaky joint portions is in a range of 5 mm or more and 15 mm or less. The thickness (T ₀ ) of the sheet at a load of 2.94 cN / cm ² is 0.8 mm or more, and when the thickness at the load of 19.6 cN / cm ² is T ₁ , the thickness at the load of 2.94 cN / cm ² is When the thickness change ratio (T ₁ / T ₀ ) at 19.6 cN / cm ² load with respect to the thickness (T ₀ ) is 0.9 or less, various conventional cleaning sheets could not be wiped off sufficiently It is possible to wipe off dust of a large size, as well as dust on home floors, tatami mats, furniture, etc., as well as soil dust such as floors living on dirt feet and sand particles with large particle sizes. Furthermore, the dust after wiping off can be held in the sheet.

The cleaning sheet of the present invention is a laminated sheet in which a card web is disposed on at least one side of the support sheet and the support sheet, and the card web and the support sheet are integrated at a streak-joint portion. The interval between the streaky joints is within a range of 5 mm or more and 15 mm or less, the thickness (T ₀ ) at the time of 2.94 cN / cm ² load in the laminated sheet is 0.8 mm or more, and 19.6 cN / when the thickness of at cm ² load was T _1, 2.94cN / cm thickness during ² load (T ₀₎ thickness change ratio during 19.6CN / cm ² load on the (T ₁ / T ₀₎ is 0. It is 9 or less. The card web constituting the laminated sheet is a collection of spread webs fed out from a card machine, and is made of fibers such as parallel web, semi-random web, random web, cross lay web, and Chris cross web. It is preferable that the degree of freedom is maintained as much as possible, and not only the accumulated web fed out from the card machine, but also at least a part of the constituent fibers are melted and fused, adhered by an adhesive, In addition, it is a concept that includes weakly entangled by needle punching treatment or hydroentanglement treatment. The card web is advantageous in that a bulky web can be obtained and the single fiber is less likely to fall off. The card web is substantially not subjected to a three-dimensional entanglement process such as a needle punch process or a hydroentanglement process in a portion other than the streak joint part, that is, in the interval between the adjacent streak joint parts. preferable. If the three-dimensional entanglement process is performed firmly in the interval between the adjacent streak joints, the entanglement between the fibers proceeds excessively, so the degree of freedom of the fibers is impaired, and the target surface is wiped with a cleaning sheet. However, the dust does not easily enter between the fibers, and tends to be recaptured on the surface of the sheet and difficult to be taken into the sheet. In particular, when sand grains having a large particle size are formed, the tendency to be hardly incorporated into the fiber sheet becomes remarkable.

  Although the fiber which comprises the said card web is not specifically limited, It is preferable that the fineness exists in the range of 0.5 dtex or more and 10 dtex or less. Within the above range, dust on the floor surface can be wiped off mainly for home use or business use. In particular, in order to wipe off fine dust such as dust and street dust, fine fibers with a fineness of 0.5 dtex or more and less than 3 dtex are contained within a range of 40 mass% or more and 80 mass% or less, and the fineness is 3 dtex or more and 10 dtex or less. It is preferable to contain fine fibers within a range of 20 mass% to 60 mass%. When the content of the fine fiber is less than 40 mass%, the amount of the thick fine fiber is relatively increased, so that the ability to hold dust tends to decrease. If the content of fine fiber exceeds 80 mass%, it may be difficult to incorporate relatively large size dust into the fiber web. When the content of the fine fiber is less than 20 mass%, it is difficult to maintain the density of the card web, and hence the bulkiness of the cleaning sheet, and a gap for capturing relatively large dust cannot be obtained, so that the cleaning function is deteriorated. There is a tendency. When the content of thick fine fibers exceeds 60 mass%, the amount of fine fine fibers is relatively small, so the ability to hold dust tends to be reduced.

  In particular, when the card web is arranged on both sides of the support sheet, the basis weight and thickness of the card web on one side is reduced, and therefore the amount of dust collected tends to be improved by increasing the content of fine fiber. Yes, it is preferable. When the card web is disposed on both sides of the support sheet, the more preferable fine fiber content is 50 mass% or more, and more preferably 60 mass% or more. A more preferable fine fiber content is 80 mass% or less. On the other hand, the more preferable content of thick fine fiber is 20 mass% or more. The more preferable content of thick fine fibers is 50 mass% or less, and even more preferably 40 mass% or less.

  The fineness difference between the fineness of the thick fineness fiber and the fineness of the fineness fine fiber is preferably 1.5 dtex or more. A more preferable difference in fineness is 2 dtex or more, and even more preferably, 2.5 dtex or more. A more preferable fineness difference is 10 dtex or less. By providing a fineness difference between the thick fine fiber and the fine fine fiber, the thick fine fiber serves as a skeleton of the card web and the gap between the fibers becomes large to make it easy to take in dust, while the fine fine fiber is a thick fine fiber. It is preferable in that the size of the voids can be made random by entering the gap and the dust once taken in can be held. As long as the thick fine fiber and the fine fine fiber satisfy the fineness difference, fibers having other finenesses may be mixed within a range that does not impair the effects of the present invention. In addition, when the thick fine fiber includes two or more kinds of fibers having different fineness and / or the fine fineness fiber includes two or more kinds of fibers having different fineness, the minimum fineness of the thick fineness fiber and the maximum fineness of the fine fineness fiber. It is calculated by the difference between

  Examples of fibers constituting the card web include natural fibers such as cotton, hemp, and wool, recycled fibers such as viscose rayon, solvent-spun cellulose, and acetate, polyolefins such as polypropylene and polyethylene, polyethylene terephthalate, polybutylene terephthalate, Polyesters such as polytrimethylene terephthalate, polyamides such as nylon 6 and nylon 66, synthetic fibers such as acrylic and polyurethane can be used. In particular, the polyester fiber is rigid, has a so-called stiffness, and has a high melting point, so that the card web does not sag during manufacturing, maintains bulkiness, and achieves a desired density of the fiber web. It is preferable in that it can be maintained. Furthermore, it is appropriate from the viewpoint of economy.

The card webs constituting the portion other than the stripe-shaped joint section described later, it is preferable that the density is within the range of 0.005 g / cm ³ or more 0.06 g / cm ^3. The density of the card web is more preferably 0.008 g / cm ³ or more, and still more preferably 0.01 g / cm ³ or more. The density of the card web is more preferably 0.055 g / cm ³ or less. As described above, the card web in the present invention is a collection of opened webs fed out from a card machine, and also represents that the entanglement form and thickness are maintained as much as possible by the above density. This can be used as a substitute characteristic. If the density of the card web is less than 0.005 g / cm ³ , the dust once taken into the card web tends to fall off. In particular, large dust such as sand particles is easily dropped. When the density of the card web exceeds 0.06 g / cm ³ , large earth and sand are difficult to be taken into the card web and the cleaning power tends to be reduced. The density of the card web can be measured as follows. First, the basis weight of the cleaning sheet and the thickness at a load of 2.94 cN / cm ² are measured. Next, the card web joined in a streak-like manner to the support sheet is peeled off from the support sheet, and the basis weight of the support sheet and the thickness at a load of 2.94 cN / cm ² are measured. The basis weight of the card web is calculated from the difference between the basis weight of the cleaning sheet and the basis weight of the support sheet. On the other hand, the thickness of the card web is calculated from the difference between the thickness of the cleaning sheet and the thickness of the support sheet. And a density can be computed from the fabric weight and thickness of a card web calculated | required above. In the present invention, the density of the card web is determined as an apparent density at a load of 2.94 cN / cm ² , and the thickness of the card web determined previously corresponds to the thickness of the portion excluding the streak joint, so that The method was adopted.

  The total thickness of the card web determined by the above-described method is preferably 0.8 mm or more. A more preferable total thickness of the card web is 1 mm or more and 3 mm or less. When the thickness of the card web is thinner than 0.8 mm, the cleaning power tends to decrease. If the card web is too thick, the fibers tend to fall off. The thickness of the card web when the card web is arranged only on one side of the support sheet is preferably 0.8 mm or more. When the card web is arranged on both sides of the support sheet, each thickness of the card web is preferably 0.4 mm or more.

The cleaning sheet of the present invention is a collection of opened webs fed out from a card machine, and the card web that maintains the degree of freedom of fibers as much as possible is used as a wiping surface. Therefore, the strength of the card web itself is weak. Elongation occurs during use, resulting in poor dimensional stability. Therefore, a support sheet is laminated | stacked on a card | curd web, and it integrates and reinforces with a streak-like junction part. Examples of the support sheet include a spunbond nonwoven fabric, a thermal bond nonwoven fabric such as point bond and air-through, a chemical bond nonwoven fabric, a hydroentangled nonwoven fabric, a woven fabric, and a net having a high elongation and low elongation compared to a card web. Among these, a spunbonded nonwoven fabric is preferable because it has excellent dimensional stability and is inexpensive. The material of the support sheet is not particularly limited, such as polyolefin such as polypropylene and polyester. For example, when using a spunbonded nonwoven fabric, it is preferable to use a thickness 0.15～0.6Mm, basis weight 10 to 40 g / m ^2.

  The card web and the support sheet are integrated at a streak joint to form a laminated sheet. As used herein, the term “stripe joint” refers to a joint in which joints extending continuously or discontinuously in one direction are arranged at intervals. By joining the card web at the streak joint as in the present invention, dirt dust and sand grains having a larger particle diameter can be wiped off. The reason is not clear, but when the card web is reduced in volume due to the wiping pressure at the time of wiping, the streaky joint is covered with the surrounding card web, and the card web against the target surface of the card web It is presumed that the contact area increases and a thin streaky dust storage portion is formed so that relatively large dust can be wiped off efficiently.

  Examples of the joining of the streaky joint include joining means such as thermal joining, ultrasonic joining, and mechanical entanglement joining. Among these, entanglement joining by water flow is preferable because the streak-like joint portion does not become hard and has excellent fit to a surface to be wiped or a jig. In particular, entanglement joining by columnar water flow is preferable because the area of the card web that contacts the surface to be wiped increases.

  The space | interval of the said adjacent streak junction parts is in the range of 5 mm or more and 15 mm or less. A preferable interval between the streaky joints is 6 mm or more. A preferable interval between the streaky joints is 10 mm. If the spacing between the streaky joints is less than 5 mm, the area of the card web constituting the portion other than the streaky joints is small, and the wiping pressure is less likely to reduce the bulk. is there. If the distance between the streaky joints exceeds 15 mm, the fibers may fall off the card web. Note that the interval here refers to the distance between adjacent streak joints when the streak joints extend continuously in one direction, and the streak joints are discontinuously arranged, that is, intermittently arranged. In this case, it refers to the distance between adjacent streak joints.

  The length in one direction of the streaky joint is preferably 5 mm or more. Most preferably, the streak joint extends continuously. If the length in one direction of the streaky joint is less than 5 mm, the single fibers may fall off from the card web.

  It is preferable that the width of the streak joint is in the range of 0.5 mm to 3 mm. A more preferable width of the streaky joint is in a range of 0.8 mm to 2.5 mm. When the width of the streaky joint is less than 0.5 mm, the card web and the support sheet tend to be easily peeled off. This is because when the width of the streak-joint portion exceeds 3 mm, the contact area of the portion other than the streak-joint portion with respect to the target surface tends to decrease, and the wiping property tends to deteriorate.

  It is preferable that the fiber length of each fiber constituting the card web is at least three times the interval between the streaky joints. A more preferable magnification between the fiber length and the interval between the streaky joints is 5 times or more. The card web is a collection of opened webs fed out from the card machine, and maintains the degree of freedom of the fibers as much as possible, so that the constituent fibers are likely to fall off. If the constituent fibers have a fiber length that is at least three times the interval between the streak joints, one fiber is often gripped by either the left or right streak joints, and the single fibers fall off from the card web. This is because it can be prevented. It is preferable that the fiber length of the constituent fiber satisfying the magnification with the interval between the streaky joints is in the range of 30 mm or more and 90 mm or less. A more preferable fiber length is 35 to 70 mm.

The laminated sheet in which the card web is arranged on at least one side of the support sheet and integrated with the streak joint portion having an interval of 5 mm or more and 15 mm or less has a thickness (T ₀ ) at a load of 2.94 cN / cm ² of 0.8 mm. That's it. The preferred thickness (T ₀ ) is 0.9 mm or more, and even more preferably 1 mm or more. The preferred thickness (T ₀ ) is 3 mm or less, and even more preferably 1.8 mm or less. The thickness at the time of 2.94 cN / cm ² load corresponds to the actual thickness of the sheet. If the thickness (T ₀ ) is less than 0.8 mm, the dust wiping amount and the holding amount cannot be said to be sufficient even if the bulk is reduced by the wiping pressure. If the thickness (T ₀ ) is too large, the fibers tend to fall off.

Furthermore, when the thickness at 19.6 cN / cm ² load in the laminated sheet is T ₁ , the thickness change ratio at 19.6 cN / cm ² load with respect to the thickness at 2.94 cN / cm ² load (T ₀ ) (T ₁ / T ₀ ) is 0.9 or less. The thickness change ratio (T ₁ / T ₀ ) was used as a measure of the bulk of the sheet that decreases due to the wiping pressure in consideration of the load applied to the cleaning sheet during actual use. It means that the smaller the thickness change ratio, the lower the bulk of the sheet due to the wiping pressure, and the greater the decrease in the bulk, the more efficiently dust can be wiped and retained. I found it. Further, the thickness change ratio (T ₁ / T ₀ ) is an accumulation of the opened webs fed out from the card machine, and is a characteristic that substitutes the form of the card web that maintains the degree of freedom of the fibers as much as possible. . For example, when the card web is firmly bonded with a binder or the like, or is strongly entangled with a relatively strong water pressure, the decrease in bulk tends to be reduced. The preferable range of the thickness change ratio (T ₁ / T ₀ ) is 0.6 or more and 0.85 or less, and more preferably 0.65 or more and 0.8 or less. When the thickness change ratio (T ₁ / T ₀ ) exceeds 0.9, the wiping property tends to decrease.

When the thickness at 49 cN / cm ² load in the laminated sheet is T ₂ , the thickness change ratio at 49 cN / cm ² load (T ₂ / T ₀ ) to the thickness at 2.94 cN / cm ² load (T ₀ ). ) Is preferably 0.85 or less. The thickness change ratio (T ₂ / T ₀ ) takes into consideration the load applied to the cleaning sheet when wiping is performed so as to press strongly during actual use. The 49 cN / cm ² load is a limit value at which the thickness of the sheet hardly changes even if the load is further increased. The thickness change ratio (T ₂ / T ₀ ) is also a characteristic that substitutes the form of the card web. A preferable range of the thickness change ratio (T ₂ / T ₀ ) is 0.6 or more and 0.8 or less. When the thickness change ratio (T ₂ / T ₀ ) exceeds 0.85, the wiping property tends to decrease.

Next, an example of the manufacturing method of the cleaning sheet of the present invention will be described. First, in order to produce a card web, staple fibers are prepared, and a card web is produced by a conventional method. As the staple fibers, the thick fine fibers and the fine fine fibers may be prepared in a predetermined amount. In this case, the density of the resulting carded web, a final in 0.005 g / cm ³ or more 0.06 g / cm ³ to be within the range, may be adjusted. For example, it can be adjusted by using a normal temperature pressing roll or the like, performing a water entangling process with a water pressure of less than 2 MPa, or using an air-through heat treatment machine such as a drum dryer or a belt dryer. Most preferably, the card web fed out from the card machine is used as it is.

  Next, the support sheet is prepared separately. And a card web is mounted on a support sheet, and a streak joining is given from a card web surface. For example, when the streak joining is hydroentanglement processing, the hole diameter is 0.05 to 0.2 mm, and 1 to 3 in the machine direction and 1 to 3 in the width direction are arranged at intervals of 0.5 to 1.5 mm. It can be obtained by ejecting a columnar water flow from a nozzle in which orifice groups are arranged at intervals of 5 to 15 mm in the width direction in a pressure range of 3 MPa to 8 MPa. The stripe joints can be set by adjusting the width of the orifice group in the width direction, and the gap in the width direction of the orifice group and the gap of the stripe joints are substantially the same. Preferable columnar water treatment conditions include a hole diameter of 0.1 to 0.2 mm, 1 to 3 orifices in the machine direction at intervals of 0.5 to 1.5 mm, and 5 orifice groups arranged in parallel in the width direction in the width direction. A columnar water flow is ejected from a nozzle arranged at intervals of ˜15 mm in a pressure range of 3 MPa to 8 MPa. The arrangement of the orifices one by one in the width direction of the nozzle can increase the contact area to the target surface of the card web than the orifice group in which two or more orifices are arranged in parallel. It is convenient because the wiping property tends to be high and the width of the streaky joint is easily adjusted to a range of 0.5 to 3 mm.

  Next, the cleaning sheet of the present invention will be described with reference to the drawings. FIG. 1 shows a schematic view of the cleaning sheet of the present invention. In the cleaning sheet 4 of the present invention, the card web 1 is joined to one side of the support sheet 2 in a streak shape at a predetermined interval to form a streak joint portion 3, and the card web surface is used when used for cleaning. Used as a wiping surface. FIG. 2 shows another schematic view of the cleaning sheet of the present invention. In the cleaning sheet 4 of the present invention, the card web 1 is joined to both surfaces of the support sheet 2 in a streak shape at a predetermined interval to form a streak joint portion 3, and the card web surface is used when used for cleaning. Used as a wiping surface.

  Note that a cleaning agent such as liquid paraffin, a surfactant, and the like can be attached to the cleaning sheet of the present invention as necessary.

  Hereinafter, the present invention will be described by way of examples. The thickness and wiping performance of the nonwoven fabric were measured by the following methods, respectively.

[Thickness]
Using a thickness measuring instrument (trade name, THICKNESS GUAGE model CR-60A, manufactured by Daiei Kagaku Seisakusho Co., Ltd.), a load of 2.94 cN / cm ² (3 g / cm ² ), 19.6 cN / cm ² (20 g / 5 points were measured with a cm ² ) load and a 49 cN / cm ² (50 g / cm ² ) load, and the average value was obtained.

[Wiping performance]
(1) Dust 15 types of JIS dust according to JIS Z 8901 were used.

(2) Amount of dust collected As shown in the plan view of FIG. 3, a well-wiped polyvinyl chloride plate 6 not contaminated with dirt is placed horizontally, and the dust is placed on this length (wiping direction) 5 cm, width A dust area 5 was created by uniformly spreading an amount of 2 g in a range of 25 cm (in the direction perpendicular thereto). A cleaning sheet 4 (20 cm in length, 20 cm in length) whose mass was measured in advance on a jig 7 (10 cm in length, 25.5 cm in width) of a household flooring wiper (trade name Quickle Wiper manufactured by Kao Corporation). The width of 25.5 cm) was attached so that the card web surface was a wiping surface and the length direction of the streak joint was the sheet width direction. Next, wiping was started on the PVC plate from the front side of the dust area 5 while maintaining an angle of 45 degrees with the surface of the PVC plate, and was passed through the dust area 5 while wiping 50 cm. The cleaning sheet 4 after passing through the dust area 5 was gently removed from the jig 7, the mass of the cleaning sheet 4 after wiping was measured, and the amount of dust collected was calculated.

(3) Dust retention rate When the cleaning sheet 4 that has collected dust by the above method (2) is attached to the jig 7 and dropped three times from a position 20 cm in height, the cleaning sheet after dropping is removed. 4 and the mass of the jig 7 were divided by the mass of the cleaning sheet 4 and the jig 7 before dropping, and the value multiplied by 100 was taken as the dust retention rate.

[Example 1]
As a thick fiber, a polyethylene terephthalate fiber having a fineness of 6.6 dtex and a fiber length of 64 mm (trade name Tetron, manufactured by Toray Industries, Inc.) 20 mass% and a fineness of 5.6 dtex, a fiber component of 51 mm in core component is polyethylene terephthalate, and the sheath component is polyethylene. A core-sheath-type heat-adhesive conjugate fiber (trade name NBF (SH), manufactured by Daiwa Boseki Co., Ltd.) 15 mass%, a fineness fine fiber of 1.45 dtex, and a length of 38 mm polyethylene terephthalate fiber (trade name Tetron, A semi-random card web having a basis weight of 25 g / m ² was prepared by blending 65 mass% with Teijin Limited). The fine fineness fiber: fine fineness fiber was a ratio (mass ratio) of 35:65.

Two layers of the card web are prepared, and a polyethylene terephthalate spunbonded nonwoven fabric (manufactured by Toyobo Co., Ltd.) with a basis weight of 15 g / m ² is laminated as a support sheet between the two layers of the card web, did. Next, a columnar water flow is sprayed once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 7 mm in the width direction on one card web surface, and this is turned over to the other card web surface. A columnar water flow is jetted once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 7 mm in the width direction, and the card web is integrated into the support sheet only by the streak-like joint, and then the drum The sheath component of the core-sheath type thermoadhesive conjugate fiber was melted by heat treatment at 140 ° C. using a type dryer to obtain the cleaning sheet of the present invention.

[Example 2]
Polyethylene terephthalate fiber (trade name: Tetron, manufactured by Toray Industries, Inc.) 20 mass% with a fineness of 6.6 dtex and fiber length of 64 mm as a thick fine fiber, and a polyethylene terephthalate fiber with a fineness of 1.45 dtex and fiber length of 38 mm (trade name) Tetron, manufactured by Teijin Ltd.) 80 mass% was mixed to prepare a semi-random card web having a basis weight of 25 g / m ² . The fine fineness fiber: fine fineness fiber was a ratio (mass ratio) of 20:80.

  Two layers of the card web were prepared, and a support sheet similar to that of Example 1 was overlapped between the two layers of the card web to form a three-layer laminate. Next, a columnar water flow is sprayed once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 7 mm in the width direction on one card web surface, and this is turned over to the other card web surface. A columnar water flow is jetted once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 7 mm in the width direction, and the card web is integrated with the support sheet only by a streak-like joint. A cleaning sheet was obtained.

[Example 3]
The same fine fine fiber as in Example 2 and a polyethylene terephthalate fiber (trade name: Tetron, manufactured by Teijin Ltd.) having a fineness of 0.9 dtex and a fiber length of 38 mm as fine fine fiber, and a fine fine fiber: 6 fine fine fiber. : Cotton blended at a ratio (mass ratio) of 4 to produce a semi-random card web having a basis weight of 50 g / m ² . A support sheet similar to that of Example 1 was superposed on one side of the card web, and a columnar water flow was applied at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm were arranged at intervals of 7 mm in the width direction on the card web surface. The card web was integrated with the support sheet only by the streak-like joint portion to obtain the cleaning sheet of the present invention.

[Example 4]
A cleaning sheet according to the present invention was obtained in the same manner as in Example 3 except that the interval between the orifices in the hydroentanglement process in the nozzle width direction was 10 mm.

[Example 5]
A cleaning sheet of the present invention was obtained in the same manner as in Example 3 except that the interval between the orifices in the hydroentanglement process in the nozzle width direction was 5 mm.

[Comparative Example 1]
Two layers of card webs similar to those of Example 1 were prepared, and a support sheet similar to that of Example 1 was laminated between the two layers of card webs to form a three-layer laminate. Next, a columnar water flow is sprayed once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 1 mm in the width direction on one card web surface, and this is turned over to the other card web surface. A columnar water flow is sprayed once at a pressure of 4 MPa from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 1 mm in the width direction, the card web is integrated on the entire surface of the support sheet, and then a drum dryer is used. Heat treatment at 140 ° C. to melt the sheath component of the core-sheath type thermoadhesive conjugate fiber to obtain a laminated sheet.

[Comparative Example 2]
A support sheet similar to that in Example 3 is superposed on one side of the card web similar to that in Example 3, and a columnar water flow is generated from a nozzle in which orifices having a hole diameter of 0.15 mm are arranged at intervals of 1 mm in the width direction on the card web surface. Was sprayed once at a pressure of 4 MPa, and the card web was integrated with the entire surface of the support sheet to obtain a laminated sheet.
Table 1 shows the physical properties of Examples 1 to 5 and Comparative Examples 1 and 2.

In the cleaning sheet of Example 1, the card web is arranged on both sides of the support sheet, and the card web contains a small amount of the heat-adhesive conjugate fiber and heat-bonds the fibers to each other. The bulk was maintained, and the degree of freedom of fiber remained. Then, the 15mm or less spacing than 5mm integrated with streaky junction, the 2.94cN / cm ² load at a thickness in the laminated sheet (T ₀₎ is at 1mm or more, at the time of 19.6cN / cm ² load Since the thickness change ratio (T ₁ / T ₀ ) satisfied that it is 0.9 or less, dust of various sizes can be wiped off efficiently, and even if the incorporated dust gives an impact to the cleaning sheet. It did not fall off easily.

Similarly, in Example 2, card webs are arranged on both sides of the support sheet, and are integrated by a streak-joint portion having an interval of 5 mm or more and 15 mm or less, and the thickness at the time of 2.94 cN / cm ² load (T ₀₎ in the laminated sheet. ) Is 1 mm or more and satisfies the fact that the thickness change ratio (T ₁ / T ₀ ) at 19.6 cN / cm ² load is 0.9 or less, so that various sizes of dust can be wiped off efficiently. The dust that was taken in did not fall off easily even when the cleaning sheet was impacted. Further, in Examples 1 and 2, since the card web is arranged on both sides, the dust collection is performed by setting the content of the fine fiber to a predetermined amount in spite of the small basis weight of the card web on one side. A high amount and retention was obtained.

In the cleaning sheets of Examples 3 to 5, the thickness change ratio (T ₁ / T ₀ ) tends to decrease as the interval between adjacent streak joints increases, and the amount of dust collected and the retention rate are also implemented. Examples 3 and 4 were particularly expensive.

On the other hand, since the cleaning sheets of Comparative Examples 1 and 2 sprayed the columnar water flow at intervals of 1 mm, the streak joints could not be visually confirmed, and the water entanglement treatment was performed on the entire surface. Further, since the thickness change ratio (T ₁ / T ₀ ) exceeded 0.9, dust could not be taken into the sheet, and the amount of dust collected was inferior.

  The cleaning sheet of the present invention can wipe away food dust such as cotton dust, bread crumbs, human hair and hair loss of pets such as dogs, cats and small birds, soil dust and sand particles having a particle size larger than this. It can be used for floors, furniture, electrical appliances, vehicles, etc.

It is the schematic which shows the cross section of the sheet | seat for cleaning of this invention. It is another schematic diagram which shows the cross section of the sheet | seat for cleaning of this invention. It is the schematic which shows the method of measuring the wiping performance of the cleaning sheet.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Card web 2 Support sheet 3 Streaky joint 4 Cleaning sheet 5 Dust area 6 Vinyl chloride slope 7 Floor wiper jig

Claims (7)

A support sheet and a laminated sheet in which a card web is disposed on at least one side of the support sheet, and the card web and the support sheet are integrated at a streak-joint portion,
The streaky joint is entangled joint by water flow,
The spacing between adjacent streaky joints is in the range of 5 mm to 15 mm,
In the interval between the streaky joints adjacent to each other, the card web is not substantially subjected to three-dimensional entanglement processing,
The thickness (T ₀ ) at the time of 2.94 cN / cm ² load in the laminated sheet is 0.8 mm or more, and when the thickness at the time of 19.6 cN / cm ² load is T ₁ , 2.94 cN / cm ² load A cleaning sheet having a thickness change ratio (T ₁ / T ₀ ) at a load of 19.6 cN / cm ^{2 with} respect to the thickness (T ₀ ) at the time of 0.9 or less. When the thickness at 49 cN / cm ² load in the laminated sheet is T ₂ , the thickness change ratio at 49 cN / cm ² load (T ₂ / T ₀ ) to the thickness at 2.94 cN / cm ² load (T ₀ ). ) Is 0.85 or less, the cleaning sheet according to claim 1. The cleaning sheet according to claim 1 or 2, wherein an interval between adjacent streak joints is in a range of 6 mm or more and 10 mm or less. The sheet | seat for cleaning in any one of Claims 1-3 whose stripe-like junction part is joining by columnar hydroentanglement. The card web includes fine fiber having a fineness of 0.5 dtex or more and less than 3 dtex within a range of 40 mass% or more and 80 mass% or less, and a thick fine fiber having a fineness of 3 dtex or more and 10 dtex or less within a range of 20 mass% or more and 60 mass% or less. including, the cleaning sheet according to any one of claims 1-4. The cleaning sheet according to any one of claims 1 to 5 , wherein the support sheet is a spunbonded nonwoven fabric. The sheet | seat for cleaning in any one of Claims 1-6 which exists in the range whose width | variety of the said streak-like junction part is 0.5 mm or more and 3 mm or less.

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