JP4891017B2 - Wipe material, sheet member and manufacturing method thereof - Google Patents

Description

  The present invention relates to a wipe material that is easily decomposed by a water flow, and a method of manufacturing a sheet member that constitutes the wipe material.

  Conventionally, a wipe material in which a non-woven fabric contains a medicine or the like has been used as a cleaning sheet for a toilet or the like, a cleaning sheet for wiping the skin of a human body or the like. Since such a wipe material is packaged in a state in which a non-woven fabric is impregnated with a drug, high water resistance is required and it does not have water decomposability. Therefore, since such a wipe material is discarded as garbage after use, it takes man-hours and costs to collect and process the garbage.

  Therefore, if the wipe material is water-degradable (water-disintegrating) that decomposes quickly with a large amount of water, when the wipe material after use is discarded as it is in a toilet, etc., without clogging the water pipes of the toilet, etc. It can be disassembled in a short time in a septic tank or the like, and man-hours and costs can be reduced in the collection and processing of garbage.

  However, the non-woven fabric is composed of only fibers and does not contain a resin binder, and is excellent in water decomposability, while being used in a wet state, or in a state impregnated with a drug, In addition, since the moisture is often wiped off, the nonwoven fabric made only of fibers may be broken due to insufficient strength during use.

For this reason, for example, Patent Document 1 includes a fibrous web material composed of 5% by mass of artificial fibers and pulp fibers having a wet strength agent, and this web material is compared with a material without a wet strength agent. We provide wipe materials that do not significantly reduce the difference in absorption capacity.
JP-A-6-339449

  However, the wipe material of Patent Document 1 uses an epichlorohydrin resin as a wet strength agent, and this epichlorohydrin resin has a strong mutagenicity by a mutagenicity test using microorganisms. Therefore, reproductive toxicity is a concern.

  Therefore, wiping skin such as a human body with a wipe material containing epichlorohydrin resin may have a safety problem. In addition, the wet strength agent often changes over time, and particularly with respect to water decomposability, water decomposability may deteriorate over time.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a wipe material having water decomposability that is easily dispersed by a water flow, and a method for manufacturing a sheet member constituting the wipe material.

  The present inventors have made extensive studies to solve the above problems. As a result, it has been found that by entanglement of at least one modified cross-section fiber with hydrophilic fiber by high-pressure water jet treatment, it is highly safe and easily dispersed by bulkiness and strength and water flow. It came to be completed. More specifically, the present invention provides the following.

  (1) It contains a hydrophilic fiber and at least one atypical cross-section fiber, and 90% by mass or more of the total mass of the hydrophilic fiber and the at least one atypical cross-section fiber is A wipe material having a fiber length of 20 mm or less.

  (2) The wipe material according to (1), further comprising a hydrophobic fiber having a fiber diameter smaller than that of the modified cross-section fiber.

  (3) The wipe material according to (1) or (2), wherein the atypical cross-section fiber is hydrophobic.

  (4) The wipe material according to any one of (1) to (3), wherein the hydrophilic fiber and the modified cross-section fiber have an average fiber length of 20 mm or less.

  (5) The wipe material according to (2), wherein the hydrophobic fiber has an average fiber length of 20 mm or less.

  (6) The wipe material according to any one of (1) to (3), wherein the hydrophilic fiber contains 90% by mass or more of a fiber having a fiber length of 20 mm or less.

  (7) The wipe material according to any one of (1) to (3), wherein the atypical cross-section fiber includes 90% by mass or more of fibers having a fiber length of 20 mm or less.

  (8) The wipe material according to (2), wherein the hydrophobic fiber contains 90% by mass or more of fibers having a fiber length of 20 mm or less.

  (9) The wipe material according to (3) or (7), wherein an average fiber diameter of the modified cross-section fibers is 20 μm or more.

  (10) The wipe material according to any one of (1) to (9), wherein the content of the hydrophilic fiber is 50% by mass or more, and the content of the atypical cross-section fiber is 5 to 30% by mass. .

  (11) The wipe material according to (2), wherein the content of the hydrophobic fiber is less than 50% by mass.

(12) The wipe material according to any one of (1) to (11), wherein the bulk density is 0.12 g / cm ³ or less.

(13) The wipe material according to any one of (1) to (12), wherein the basis weight is 30 to 100 g / m ² .

  (14) The wipe material according to any one of (1) to (13), wherein the dry strength and the wet strength are each 2.0 N / 25 mm or more.

  (15) After forming a fiber web from the hydrophilic fiber and at least one kind of modified cross-section fiber by a wet papermaking method, both sides or one side of the fiber web is subjected to high-pressure water jet flow treatment, and the hydrophilic fiber And the wipe material according to any one of (1) to (14), which is obtained by entanglement with at least two of the hydrophobic fibers.

(16) When the wipe material whose sample piece is 10 cm × 10 cm is put into 800 ml of distilled water and shaken at a shaking speed of 240 rpm for 30 minutes, the size of the maximum piece of the wipe material is dispersed to 50 cm ² or less. The wipe material according to any one of (1) to (15).

  (17) A wipe material in a container in which the wipe material according to any one of (1) to (16) is stacked and stored in a container.

  (18) It contains a hydrophilic fiber and at least one type of atypical cross-section fiber, and is 90% by mass or more of the total mass of the hydrophilic fiber and the at least one type of atypical cross-section fiber. The fiber is a sheet member having a fiber length of 20 mm or less.

  (19) A step of forming a fiber web by a wet papermaking method from a hydrophilic fiber and at least one modified cross-section fiber, a high-pressure water jet treatment on both sides or one side of the fiber web, and the hydrophilic fiber, A method for producing a sheet member, comprising the step of interlacing the atypical cross-section fiber.

  (20) The method for producing a sheet member according to (19), wherein the high-pressure water jet flow treatment is performed 1 to 6 times on both sides or one side of the fiber web.

  According to the wipe material of the present invention, it can be easily dispersed by a water flow.

  The wipe material and sheet member of the present invention are blended with hydrophilic fibers and at least one modified cross-section fiber, and 90% by mass of the total mass (total amount) of the hydrophilic fibers and the modified cross-section fibers. The above is characterized in that the fiber length is 20 mm or less.

  Hereinafter, embodiments of the method for manufacturing a wipe member and a sheet member of the present invention will be described in detail. However, the present invention is not limited to the following embodiments, and may be appropriately selected within the scope of the object of the present invention. Can be implemented with changes. In addition, although description is abbreviate | omitted suitably about the location where description overlaps, the meaning of invention is not limited.

[First embodiment of wipe material]
FIG. 1 is a schematic view of a first embodiment of the wipe material of the present invention. The wipe material 1 contains hydrophilic fibers 2 and atypical cross-section fibers 3. The hydrophilic fiber 2 and the modified cross-section fiber 3 are contained in an entangled state, and these two types of fibers are obtained by entanglement by high-pressure water jet treatment, which will be described in detail later. In FIG. 1, for convenience of explanation, a state in which two types of fibers, the hydrophilic fiber 2 and the modified cross-section fiber 3 are entangled is shown, but at least two types of the hydrophilic fiber 2 and the modified cross-section fiber 3 are contained. For example, a plurality of modified cross-section fibers 3 having different fiber diameters may be contained.

  By containing the hydrophilic fiber 2 in the wipe material 1, the strength of the wipe material 1 can be improved. Moreover, when a chemical | medical agent etc. are included in the wipe material 1, a chemical | medical agent etc. can be spread | diffused uniformly and quality can be stabilized.

  By including the modified cross-section fiber 3 in the wipe material 1, the wipe material 1 is made bulky and the bulk density is lowered, thereby giving the entire wipe material 1 flexibility and providing an extremely soft wipe material 1. . The modified cross-section fiber 3 can be appropriately changed according to the purpose of use of the wipe member 1, but is preferably hydrophobic from the viewpoint of improving the strength of the wipe member 1.

  The modified cross-section fiber 3 preferably has a low Young's modulus in order to be entangled in the high-pressure water jet flow treatment. Therefore, it is preferable to have various known cross-sections such as a star shape, a C-shape, a T-shape, a Y-shape, a W-shape, and a rhombus, which are atypical cross-sections that can increase the apparent thickness of the fiber even with the same fineness. By using a fiber having an atypical cross section, voids are more easily formed between the fibers than in a perfect circular cross section fiber, and when discarded in a toilet or the like, water easily enters between the fibers, thereby improving water disintegration. The modified cross-section fiber 3 may use crimped fibers as necessary.

Here, the hydrophilic fiber means a fiber having a hydrophilic group on the surface. The hydrophilic group here means a polar atomic group having a strong interaction with water. For example, (—SO ₃ H), (—SO ₃ M (M is an alkali metal or —NH ₄ )), _{(-OSO 3 H), (-} OSO 3 M), (- COOM) or the like, or _{(-COOH), (- NH 2} ), (- CN), (- OH), an (NHCONH ₂₎ or the like.

  The hydrophilic fiber 2 used in the present invention is not particularly limited as long as it is hydrophilic. For example, non-wood pulp such as wood pulp, hemp, cotton, regenerated cellulose, acetate fiber, PVA (polyvinyl alcohol) fiber, CMC Various known hydrophilic fibers such as highly hydrophilic synthetic fibers such as (carboxymethylcellulose) fibers can be used. These may be used alone or in combination.

  The atypical cross-section fiber 3 used in the present invention is preferably a fiber having no hydrophilic group, or a fiber having a hydrophilic group but weak hydrophilicity, such as polyolefin fiber, polypropylene, polyethylene, polystyrene, Various known hydrophobic fibers such as polyester fibers, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and copolymers thereof, polyamide fibers such as nylon 6, nylon 6, 6, etc., polyacrylonitonyl fibers, acrylic fibers, etc. Can be used. These may be used alone or in combination.

  The fiber diameter of the modified cross-section fiber 3 can be appropriately changed according to the purpose of use and the like, but the average fiber diameter of the modified cross-section fiber 3 is preferably a fiber of 20 μm or more. Here, the atypical cross-section fiber 3 indicates an apparent average fiber diameter because the cross-sectional shape is different. By using the atypical cross-section fiber 3 having such a fiber diameter, the bulkiness can be improved only by adding a small amount of the atypical cross-section fiber 3 of the wipe material 1, and at the same time, the water disintegrability of the wipe material 1 is deteriorated. Can be prevented.

  The content of the hydrophilic fibers 2 contained in the entire wipe material 1 is preferably 50% by mass or more, and the content of the modified cross-section fibers 3 is preferably 5 to 30% by mass. By setting it as such a content rate, it has bulkiness and intensity | strength, and can be easily hydrolyzed by a water flow.

  When the content of the hydrophilic fiber 2 is less than 50% by mass, the content of the atypical cross-section fiber 3 is excessively increased and is difficult to be easily hydrolyzed. Further, when impregnating with a drug or the like, the drug or the like does not diffuse uniformly on the wipe material 1, and unevenness is likely to occur.

  When the content of the modified cross-section fiber 3 is less than 5% by mass, the effect of suppressing the basis weight of the wipe material 1 is weakened, and it is difficult to make the wipe material 1 bulky. On the other hand, when the content of the atypical cross-section fiber 3 exceeds 30% by mass, the atypical cross-section fiber 3 is weaker in fiber entanglement than the hydrophilic fiber 2, so that the strength of the wipe material 1 is reduced, and fuzzing or tearing easily occurs. It becomes the cause of becoming.

  90% by mass or more of the entire fibers (hydrophilic fibers 2 and atypical cross-section fibers 3) contained in the entire wipe material 1 preferably have a fiber length of 20 mm or less. By setting 90% by mass or more of the fibers to a fiber length of 20 mm or less, each fiber can be easily dispersed by a water flow even if the wipe material 1 is discarded in a toilet or the like. In addition, if the fiber content of the fiber length of 20 mm or less contained in the entire wipe material 1 is less than 90% by mass, the texture becomes worse at the time of paper making, or the water disintegration deteriorates in a septic tank such as a toilet, and the water is disintegrated. There is also a risk that the water flow in the septic tank may become entangled with the diffusing tube and inhibit aeration or damage the diffusing tube.

  Moreover, you may make a whole wipe material 1 contain a fiber so that the average fiber length of the hydrophilic fiber 2 and the atypical cross-section fiber 3 may be 20 mm or less. If the average fiber length exceeds 20 mm, the texture becomes worse during paper making, the water disintegration property deteriorates in the septic tank such as a toilet, etc. There is a risk that. In addition, you may make a whole wipe material 1 contain a fiber so that each average fiber length of the hydrophilic fiber 2 and the atypical cross-section fiber 3 may be 20 mm or less.

  Furthermore, the hydrophilic fiber 2 and the modified cross-section fiber 3 may contain 90% by mass or more of fibers having a fiber length of 20 mm or less. If the fiber length is less than 90% by weight, the texture becomes worse during paper making, or water disintegration deteriorates in a septic tank such as a toilet. There is a risk of entangled aeration inhibition and damage to the air diffuser.

It is preferable that the bulk density of the wipe material 1 is 0.12 g / cm ³ or less, and it is more preferable that the hydrophilic fiber 2 and the modified cross-section fiber 3 are contained so as to be 0.10 g / cm ³ or less. By setting the bulk density of the wipe material 1 in such a range, the wipe material 1 having a soft touch can be provided.

The basis weight of the wipe material 1 can be appropriately changed according to the purpose of use of the wipe material 1, but is preferably 30 to 100 g / m ² . By setting the basis weight of the wipe material 1 in such a range, a certain degree of strength can be maintained. If the basis weight of the wipe material 1 is less than 30 g / m ² , the necessary strength as the wipe material 1 cannot be maintained. On the other hand, if the basis weight of the wipe material 1 exceeds 100 g / m ² , the thickness of the wipe material 1 increases, the tactile sensation becomes harder, and the water disintegrability becomes worse.

  The dry strength of the wipe material 1 of the present invention is preferably 2.0 N / 25 mm or more with respect to the MD direction, and preferably 5.0 N / 25 mm or more. It is preferably 2.0 N / 25 mm or more with respect to the CD direction, and preferably 2.5 N / 25 mm or more. By setting the dry strength within such a range, the necessary strength as the wipe material 1 can be maintained. Moreover, it is preferable that wet strength is 2.0 N / 25mm or more with respect to MD direction and CD direction. By setting the wet strength in such a range, even if the wipe material 1 is in a wet state, the necessary strength as the wipe material 1 can be maintained.

  The dry elongation and the wet elongation of the wipe material 1 of the present invention are preferably 10% or more with respect to the MD direction and the CD direction, respectively. By setting the dry elongation and the wet elongation within such ranges, flexibility and a necessary strength as the wipe material 1 can be maintained.

Moreover, it is preferable that the liquid diffusion area of the wipe material 1 of this invention is 3000 mm < ² > or more. By setting the liquid diffusion area in such a range, when the wipe material 1 is impregnated with the drug or the like, the drug or the like is diffused throughout the wipe material 1, and unevenness in moisture content can be prevented.

  When the wiping material 1 is discarded in a toilet or the like, the hydrophilic fibers 2 contained in the wiping material 1 begin to be unwound quickly due to a large amount of water flowing in the toilet. When the hydrophilic fiber 2 starts to be unwound, the atypical cross-section fiber 3 entangled with the hydrophilic fiber 2 is unwound, and each fiber is quickly dispersed by loosening the entanglement.

The water disintegration property of the wipe material 1 of the present invention is appropriately changed according to the purpose of use and the size of the wipe material 1. For example, when the size of the wipe material is a square of 10 cm × 10 cm, 800 ml of distilled water is used. When the wipe material 1 is put in and shaken at a shaking speed of 240 rpm for 30 minutes, the size of the largest piece of the wipe material 1 is preferably dispersed to 50 cm ² or less, and is dispersed to 25 cm ² or less. More preferably, the wipe material 1 is more preferably dispersed at a level that does not retain the original shape. When the size of the maximum piece of the wipe material 1 is more than 50 cm ² , the wipe material 1 may be clogged in the toilet pipe when the wipe piece 1 is discarded after being thrown into the toilet.

[Second Embodiment of Wipe Material]
FIG. 2 is a schematic view of a second embodiment of the wipe material of the present invention. The second embodiment is the same as the first embodiment except that the wipes 1 further contain hydrophobic fibers 4. The hydrophilic fiber 2, the atypical cross-section fiber 3 and the hydrophobic fiber 4 are contained in an entangled state, and these three types of fibers are obtained by entanglement by high-pressure water jet flow treatment, which will be described in detail later. . For convenience of explanation, FIG. 2 shows a state in which three types of fibers, hydrophilic fiber 2, atypical cross-section fiber 3 and hydrophobic fiber 4, are entangled, but hydrophilic fiber 2, atypical cross-section fiber 3 and It is sufficient that at least three types of hydrophobic fibers 4 are contained. For example, a plurality of modified cross-section fibers 3 and hydrophobic fibers 4 having different fiber diameters may be contained.

  By including the hydrophobic fiber 4 in the wipe material 1, the hydrophilic performance of the wipe material 1 is lowered. If the wipe material 1 is too hydrophilic, for example, the plurality of wipe materials 1 may stick to each other due to surface tension in the container, and the plurality of wipe materials 1 may come out together when the wipe material 1 is taken out. For this reason, it is possible to prevent the wipe materials 1 from sticking to each other due to the surface tension by further including the hydrophobic fibers 4 in the wipe material 1. That is, even if the wipe materials 1 are stacked and stored in a plurality of containers, when the wipe material 1 is taken out, the plurality of wipe materials 1 do not come out at the same time. Moreover, the tactile sensation is soft by containing the hydrophobic fiber 4, and friction and irritation | stimulation with respect to skin can be reduced.

  The hydrophobic fiber 4 used in the present invention is preferably a fiber having no hydrophilic group or a fiber having a hydrophilic group but weak hydrophilicity, such as polyolefin fiber, polypropylene, polyethylene, polystyrene, Various known hydrophobic fibers such as polyester fibers, polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate and copolymers thereof, polyamide fibers such as nylon 6, nylon 6, 6, etc., polyacrylonitonyl fibers, acrylic fibers, etc. Can be used. These may be used alone or in combination.

  The fiber diameter of the hydrophobic fiber 4 can be appropriately changed according to the purpose of use and the like, but it is preferable that the fiber diameter is smaller than that of the modified cross-section fiber 3. For this reason, it is preferable that the average fiber diameter of the hydrophobic fiber 4 is a fiber of 10 micrometers or less. By using the hydrophobic fiber 4 having such a fiber diameter, since the fiber diameter is thin, the tactile sensation is soft, and friction and irritation to the skin can be reduced.

  The hydrophobic fibers 4 contained in the entire wipe material 1 are preferably contained in an amount of less than 50% by mass. By setting it as such a content rate, tactile feeling is soft and the friction and irritation | stimulation with respect to skin can be reduced. In addition, water can be easily disintegrated by the water flow. When the content of the hydrophobic fiber 4 is 50% by mass or more, the content of the hydrophobic fiber 4 is excessively increased and it is difficult to easily hydrolyze.

  90% by mass or more of the entire fibers (hydrophilic fiber 2, atypical cross-section fiber 3 and hydrophobic fiber 4) contained in the entire wipe material 1 preferably have a fiber length of 20 mm or less. By setting 90% by mass or more of the fibers to a fiber length of 20 mm or less, each fiber can be easily dispersed by a water flow even if the wipe material 1 is discarded in a toilet or the like. In addition, if the fiber content of the fiber length of 20 mm or less contained in the entire wipe material 1 is less than 90% by mass, the texture becomes worse at the time of papermaking, or the water disintegration deteriorates in a septic tank such as a toilet, and water disintegration is caused. There is a risk that the water flow in the septic tank may become entangled with the air diffuser and inhibit aeration and damage the air diffuser.

  Moreover, you may contain a fiber in the wipe material 1 whole so that the average fiber length of the hydrophilic fiber 2, the atypical cross-section fiber 3, and the hydrophobic fiber 4 may be 20 mm or less. If the average fiber length exceeds 20 mm, the texture becomes worse during paper making, the water disintegration property deteriorates in the septic tank such as a toilet, etc. There is a risk that. In addition, you may make the whole wipe material 1 contain a fiber so that each average fiber length of the hydrophilic fiber 2, the atypical cross-section fiber 3, and the hydrophobic fiber 4 may be 20 mm or less.

  Furthermore, the hydrophilic fiber 2, the modified cross-section fiber 3 and the hydrophobic fiber 4 may contain 90% by mass or more of fibers having a fiber length of 20 mm or less. If the fiber length is less than 90% by weight, the texture becomes worse during paper making, or water disintegration deteriorates in a septic tank such as a toilet. There is a risk of entangled aeration inhibition and damage to the air diffuser.

[Sheet material]
The wipe material 1 as described above can be used as a sheet member in addition to the wipe material 1. Since such a sheet member is excellent in water decomposability and has a good touch feeling, it can be used for absorbent articles such as interlabial pads, disposable diapers and sanitary napkins, for example.

[Manufacturing method of sheet member (wipe material 1)]
The wipe member 1 that is a sheet member of the present invention forms a fiber web from the above-described hydrophilic fiber 2, modified cross-section fiber 3, and hydrophobic fiber 4 by a wet papermaking method, and then performs high-pressure water jet flow treatment on the fiber web. Manufactured by. Here, the fiber web is a sheet-like fiber lump in which fiber directions are aligned to some extent. In addition, you may make it form a fiber web in a dry papermaking method. In this high pressure water jet treatment, a generally used high pressure water jet treatment device is used.

  When high pressure water jet treatment with a jet of relatively strong pressure is performed on one or both sides of the fiber web, the hydrophilic fibers 2, the irregular cross-section fibers 3 and the hydrophobic fibers 4 are strongly entangled at the location where the jet hits. At the same time, the three fibers are maintained in a bulky state where the jet does not hit. As a result, the wipe material 1 as a whole has high integrity of the hydrophilic fiber 2, the modified cross-section fiber 3, and the hydrophobic fiber 4, and is bulky and excellent in air permeability, water absorption, heat retention, softness, and the like. Things are obtained.

  In the high-pressure water jet flow treatment, a high-pressure water flow is sprayed, and the hydrophilic fiber 2, the modified cross-section fiber 3, and the hydrophobic fiber 4 in the sprayed portion are entangled and integrally joined. A normal nonwoven fabric manufacturing technique etc. can be applied to the apparatus used for high-pressure water jet treatment, treatment conditions, and the like.

The details of the high-pressure water jet flow treatment are as follows: the fiber web is placed on a conveyor belt that is continuously moved, and the high-pressure water jet flow is jetted so as to pass from the front surface to the back surface of the fiber web. Let In this high-pressure water jet flow treatment, the wipe material 1 obtained by appropriately changing the weighing of the fiber web, the hole diameter of the injection nozzle, the number of holes of the injection nozzle, the work amount (energy) when processing the fiber web, etc. The nature of can be changed. However, in the present invention, the high-pressure water jet flow treatment is performed so that the work amount derived by Equation 1 shown below is 0.05 to 0.5 kW / m ² per treatment on one side of the fiber web. It is preferable. If the work amount is less than 0.05 kW / m ² , the bulkiness of the wipe material 1 is inferior. On the other hand, when the work amount exceeds 0.5 kW / m ² , the fibers may be entangled so that the water disintegration may be deteriorated or the fiber web may be broken. This high pressure water jet treatment can also be carried out on one or both sides of the fiber web. For example, by performing a high-pressure water jet flow treatment of 0.05 to 0.5 kW / m ^{2 on} one side or both sides of the fiber web 1 to 6 times, the wipe material 1 having preferable water decomposability and wet strength is obtained. Can do.

Work (kW / m ² ) = {1.63 × injection pressure (kgf / cm ² ) × injection flow rate (m ³ / min)} ÷ processing speed (m / min) (Equation 1)

Further, when the work amount is 0.05 to 0.5 kW / m ² , for example, the nozzle has a hole diameter of 90 to 100 microns, and the nozzles are arranged in the CD direction at intervals of 0.3 to 2.0 mm. Processing can be performed. In this case, the entanglement of the fibers becomes appropriate.

  In addition, after the fiber web is formed, the high-pressure water jet treatment may be performed without drying the fiber web. Alternatively, the fiber web may be once dried and then subjected to a high-pressure water jet treatment.

  Further, the wipe material 1 of the present invention is not limited to the high-pressure water jet flow treatment, and the wipe material 1 may be manufactured by interlacing fibers using a needle, air, or the like.

  For convenience of explanation, the case where the wipe material 1 containing the hydrophilic fiber 2, the modified cross-section fiber 3 and the hydrophobic fiber 4 has been described has been described, but the same method can be used when the hydrophobic fiber 4 is not contained. Can be manufactured.

  Examples of the present invention will be described below. However, these examples are merely examples for suitably explaining the present invention, and do not limit the present invention.

[Manufacture of wipe material 1]
In order to evaluate the water disintegration property and the like of the wipe material 1 of the present invention, the wipe material 1 was produced, and the characteristics thereof were examined.

  As the hydrophilic fiber 2, rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.1 dtex and a fiber length of 7 mm was used, and NBKP (CSF 600 cc) was used as the pulp.

  As the atypical cross-section fiber 3, a PET fiber having a T-shaped atypical cross section with a fineness of 2.2 dtex and a fiber length of 10 mm (EPTC203 (T-type cross section) manufactured by Kuraray Co., Ltd.) was used.

  As the hydrophobic fiber 4, PET fiber (EP043 manufactured by Kuraray Co., Ltd.) having a fineness of 0.44 dtex and a fiber length of 10 mm was used.

  The content ratio of the hydrophilic fiber 2, the modified cross-section fiber 3 and the hydrophobic fiber 4 is 70 mass% for the hydrophilic fiber 2 (40 mass% for rayon fiber and 30 mass% for NBKP), and 20 mass for the modified cross-section fiber 3. % And hydrophobic fiber 4 was 10% by mass.

Using a square heat machine manufactured by Kumagai Riki Kogyo Co., Ltd., the hydrophilic fiber 2, the modified cross-section fiber 31 and the hydrophobic fiber 4 are made from Nippon Filcon Co., Ltd. wire (LL-70E (double weave)). ) To make a paper sheet. Each fiber was entangled by setting the energy to 0.38 kW / m ² on both sides of the fiber web and performing the high-pressure water jet treatment four times. Then, a wipe material 1 (sheet member) was manufactured by drying at 120 ° C. for 3 minutes using a rotary dryer. The nozzles had a hole diameter of 95 μm and were arranged in the CD direction at intervals of 0.5 mm. This is Example 1.

[Measurement of dry strength and dry elongation]
Example 1 was measured with a Tensilon tester (manufactured by A & D Co., Ltd.), with a sample width of 25 mm, a length of 150 mm, a chuck interval of 100 mm, and a tensile speed of 100 mm / min. Measurements were performed in the MD direction and the CD direction, respectively. The dry strength is the maximum tensile strength, and the dry elongation is the elongation at the maximum tensile strength.

[Measurement of wet strength and wet elongation]
Example 1 was impregnated with ion-exchanged water at a moisture content of 300% (weight to base fabric), allowed to stand in a sealed container for 3 hours, and then subjected to a sample width using a Tensilon tester (manufactured by A & D Corporation). Wet strength and wet seismic intensity were measured at 25 mm, length 150 mm, chuck interval 100 mm, and tensile speed 100 mm / min. Measurements were performed in the MD direction and the CD direction, respectively. The wet strength is the maximum tensile strength, and the wet elongation is the elongation at the maximum tensile strength.

[Measurement of liquid diffusion area]
1 ml of distilled water was dropped on Example 1 at a dropping speed of 7 ml / min, and the diffusion length in the vertical and horizontal directions 60 seconds after dropping was measured.

[Measurement of water disintegration by shake flask method]
In advance, 800 ml of distilled water was put into a 1000 ml flask, and 10 cm × 10 cm square of Example 1 was put into distilled water and shaken with a shaker (IWAKI SHKV-200) for 30 minutes at a shaking speed of 240 rpm. . As a result, when Example 1 is dispersed at a level that does not retain the original shape, and when the size of the maximum piece of Example 1 is dispersed to 50 cm ² or less, “◯”, the maximum of Example 1 In the case where the size of the piece is 50 cm ² or more, “△” is given, and in the case where Example 1 is not dispersed and the original shape is kept, “×” is given.

  In addition to Example 1, wipe materials 1 in which the contents of hydrophilic fiber 2, atypical cross-section fiber 3 and hydrophobic fiber 4 were changed were produced from Example 2 to Example 5, and the same test as in Example 1 was performed. The measurement was performed. In Examples 2 to 5, the same size and shape as Example 1 were used.

  In addition, as comparative examples, the wipe material 1 was manufactured as shown below from Comparative Examples 1 to 7, and the same tests and measurements as in Example 1 were performed. Note that Comparative Example 1 to Comparative Example 7 had the same size and shape as Example 1.

[Comparative Example 1]
Atypical cross-section fiber 3 is not used, hydrophilic fiber 2 uses 85% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.4 dtex and a fiber length of 38 mm, and hydrophobic fiber 4 has a fineness. Was manufactured in the same manner as in Example 1 except that 15% by mass of PET fiber (EP133 manufactured by Kuraray Co., Ltd.) having a fiber length of 38 mm and 1.4 dtex was used.

[Comparative Example 2]
Atypical cross-section fiber 3 is not used, hydrophilic fiber 2 uses 50% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.4 dtex and a fiber length of 38 mm, and hydrophobic fiber 4 has a fineness. Was manufactured in the same manner as in Example 1 except that 50% by mass of PET fiber (EP133, manufactured by Kuraray Co., Ltd.) having a length of 38 mm and 1.4 dtex was used.

[Comparative Example 3]
Atypical cross-section fiber 3 is not used, and hydrophilic fiber 2 has 20% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.1 dtex and a fiber length of 7 mm, and NBKP (CSF 600 cc) as 30 pulp. Hydrophobic fiber 4 was produced in the same manner as Example 1 except that 50% by mass of PET fiber (EP043 manufactured by Kuraray Co., Ltd.) having a fineness of 0.4 dtex and a fiber length of 10 mm was used.

[Comparative Example 4]
Atypical cross-section fiber 3 is not used, and hydrophilic fiber 2 has a fineness of 1.1 dtex and a fiber length of 7 mm, 40% by weight of rayon fiber (Corona made by Daiwabo Rayon Co., Ltd.) and 30% NBKP (CSF 600cc) as pulp. The hydrophobic fiber 4 is 10% by mass of a PET fiber (EP043 manufactured by Kuraray Co., Ltd.) having a fineness of 0.4 dtex and a fiber length of 10 mm, and a modified cross section having a fineness of 3.3 dtex and a fiber length of 10 mm. It was produced in the same manner as in Example 1 except that 20% by mass of non-fiber PET fiber (EP303 manufactured by Kuraray Co., Ltd.) was used.

[Comparative Example 5]
Hydrophilic fiber 2 uses 40% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.1 dtex and a fiber length of 7 mm, and 30% by mass of NBKP (CSF 600cc) as pulp. Is 10% by mass of PET fiber (EP043 manufactured by Kuraray Co., Ltd.) having a fineness of 0.4 dtex and a fiber length of 10 mm, and PVA fiber (Kuraray Co., Ltd.) having a fineness of 5.6 dtex and a fiber length of 8 mm. Manufactured in the same manner as in Example 1 except that 20% by mass of VPB503) was used.

[Comparative Example 6]
The hydrophilic fiber 2 uses 10% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.1 dtex and a fiber length of 7 mm, and 30% by mass of NBKP (CSF 600cc) as pulp. 40% by mass of PET fiber having a fineness of 0.4 dtex and a fiber length of 10 mm (EP043 manufactured by Kuraray Co., Ltd.), and the atypical cross-section fiber 3 is a T-shaped atypical cross section having a fineness of 2.2 dtex and a fiber length of 10 mm It was produced in the same manner as in Example 1 except that 20% by mass of PET fiber (EPTC203 (T-type cross section) manufactured by Kuraray Co., Ltd.) having a mass of 10% was used.

[Comparative Example 7]
The hydrophilic fiber 2 uses 30% by mass of rayon fiber (corona manufactured by Daiwabo Rayon Co., Ltd.) having a fineness of 1.1 dtex and a fiber length of 7 mm, and 30% by mass of NBKP (CSF 600cc) as pulp. The same as Example 1 except that 40% by mass of PET fiber having a T-shaped atypical cross section with a fineness of 2.2 dtex and a fiber length of 10 mm (EPTC203 (T-shaped cross section) manufactured by Kuraray Co., Ltd.) was used. Manufactured. The results are shown in Table 1.

  From Table 1, it can be seen that in Examples 1 to 5, distilled water diffuses uniformly on the wipe material 1 as can be seen from the liquid diffusion area. Moreover, it turns out that it has the intensity | strength which is hard to tear even if the wipe material 1 is used by dry strength, wet strength, dry elongation, and wet elongation.

  In addition, it can be seen that Examples 1 to 6 are excellent in water decomposability and do not cause piping clogging in toilets or the like even if they are discarded after being thrown into toilets or the like. Thereby, it turns out that the wipe material 1 of this invention has the intensity | strength which is bulky and hard to tear even if it is used, and is excellent in water decomposability.

  On the other hand, in Comparative Examples 1 to 7, when the water disintegration is improved, the dry strength and the wet strength are lowered, and when the dry strength and the wet strength are improved, the water disintegration is deteriorated. From this, it can be seen that in Comparative Examples 1 to 7, unlike the present invention, it is impossible to achieve both water disintegration and strength.

It is the schematic of 1st embodiment of a wipe material. It is the schematic of 2nd embodiment of a wipe material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wipe material 2 Hydrophilic fiber 3 Atypical cross-section fiber 4 Hydrophobic fiber

Claims (19)

Hydrophilic fibers,
At least one hydrophobic atypical cross-section fiber,
Wherein among the total mass in conjunction hydrophilic fibers and the said modified cross-section fibers, 90 mass% or more of the fibers, fiber length Ri der less 20 mm,
The content of the hydrophilic fibers is not less than 50 wt%, the content of the modified cross-section fiber is 5 to 30% by mass Ru wipes.   Furthermore, the wipe material of Claim 1 containing the hydrophobic fiber whose fiber diameter is thinner than the said unusual cross-section fiber. The wipe material according to claim 1 or 2 , wherein the hydrophilic fiber and the modified cross-section fiber have an average fiber length of 20 mm or less.   The wipe material according to claim 2, wherein the hydrophobic fiber has an average fiber length of 20 mm or less. The wipe material according to any one of claims 1 to 4, wherein the hydrophilic fibers contain 90% by mass or more of fibers having a fiber length of 20 mm or less. The wipe material according to any one of claims 1 to 4, wherein the odd-shaped cross-section fiber contains 90% by mass or more of fibers having a fiber length of 20 mm or less.   The wipe material according to claim 2, wherein the hydrophobic fiber contains 90% by mass or more of fibers having a fiber length of 20 mm or less. The wipe material according to any one of claims 1 to 6, wherein an average fiber diameter of the modified cross-section fibers is 20 µm or more.   The wipe material according to claim 2, wherein the content of the hydrophobic fibers is less than 50% by mass. The wipe material according to claim 9, comprising the hydrophilic fiber in a content of 70% by mass, the atypical cross-section fiber in a content of 20% by mass, and the hydrophobic fiber in a content of 10% by mass. The wipe material according to any one of claims 1 to 10 , wherein the bulk density is 0.12 g / cm ³ or less. Basis weight, wipe material according to any one of claims 1 to 11 is 30 to 100 g / ^{m 2.} The wipe material according to any one of claims 1 to 12 , wherein the dry strength and the wet strength are each 2.0 N / 25 mm or more. After forming a fiber web from the hydrophilic fiber and at least one type of atypical cross-section fiber by a wet papermaking method, a high-pressure water jet treatment is performed on both sides or one side of the fiber web, and the hydrophilic fiber and at least The wipe material according to any one of claims 2, 4, 7, 9 and 10 , which is obtained by entanglement of two hydrophobic fibers. When the wipe material having a sample piece of 10 cm × 10 cm is put into 800 ml of distilled water and shaken at a shaking speed of 240 rpm for 30 minutes, the maximum piece size of the wipe material is dispersed to 50 cm ² or less. Item 15. The wipe material according to any one of Items 1 to 14 . A wipe material in a container in which the wipe material according to any one of claims 1 to 15 is stacked and stored in a container. Hydrophilic fibers,
At least one hydrophobic atypical cross-section fiber,
Wherein of the total weight of the hydrophilic fibers of the combination of the at least one modified cross-section fibers, 90 mass% or more of the fibers, fiber length Ri der less 20 mm,
The content of the hydrophilic fibers is not less than 50 wt%, the content of the modified cross-section fiber is 5 to 30% by mass Ru sheet member. A step of forming a fiber web containing 50% by mass or more of the hydrophilic fiber and 5 to 30% by mass of the modified cross-sectional fiber by a wet papermaking method from the hydrophilic fiber and at least one hydrophobic modified cross-sectional fiber. When,
A method for producing a sheet member, comprising: subjecting both surfaces or one surface of the fiber web to a high-pressure water jet treatment to entangle the hydrophilic fibers and the modified cross-section fibers. The manufacturing method of the sheet | seat member of Claim 18 which performs the said high pressure water jet flow process 1 to 6 times on both surfaces or one side of the said fiber web.

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