JP5690923B2 - Nonwoven roll - Google Patents

Description

  The present invention relates to a nonwoven fabric roll that retains the texture of the nonwoven fabric and is excellent in handleability.

  In recent years, with the increase in production efficiency of nonwoven fabrics, the speed of manufacturing equipment is naturally increased, and in the process of processing nonwoven fabrics, the length of nonwoven fabric rolls prior to processing is required to reduce the number of switching aimed at cost reduction. ing. In addition, it is essential to slit from a narrow width to a wide width depending on the application.

  However, since the roll diameter has a limit on the roll diameter depending on the processing equipment, the winding tension is often increased to suppress the roll diameter when slitting and winding the nonwoven fabric roll. As a result, the nonwoven fabric roll is generally wound around a paper tube (see, for example, Patent Document 1), but the rolled up form of the nonwoven fabric roll causes winding misalignment, or the paper tube as the core is misaligned, The paper tube sometimes came off. Furthermore, during processing using such a nonwoven fabric roll, meandering, a lot of fabric slack, or slippage between the paper tube and the nonwoven fabric occurred, and some roll products could not be used.

  There are a wide variety of non-woven fabrics, from soft to hard. Especially, non-woven fabrics with good texture and softness and good slipperiness on the surface may be damaged by winding during winding, and the texture of the nonwoven fabric may be impaired. Many of them are difficult to wind stably and in a long length.

  Moreover, the weight of roll itself is also increased by elongating a nonwoven fabric roll. The handling of the roll after packing the non-woven roll is generally performed in a vertical orientation with good transport and loading efficiency. When placing a non-woven roll vertically or when handling a roll placed vertically, the end face or corner of the roll tends to be subjected to a load, resulting in a compressive force and the formation of deformed wrinkles. It often ends up.

  In addition, in non-woven fabrics that have hygroscopicity or non-woven fabrics that have been treated with a water-soluble treatment agent such as a hydrophilic treatment, there is a problem that the wetness of the paper tube will shift to the non-woven fabric when stored under high temperature and high humidity. There was also.

Japanese Patent Laid-Open No. 2004-150008

  An object of the present invention is to solve the above-described problems and provide a nonwoven fabric roll wound up stably and in a long length without impairing the performance of a nonwoven fabric having a particularly good texture.

  As a result of various studies to solve the above problems, the present inventors have found that problems such as winding misalignment, paper tube misalignment, and paper tube slippage occur when the nonwoven fabric is wound too softly, and too tightly wound. However, since a problem such as winding deviation due to the width of the nonwoven fabric or a difference in winding diameter occurs, it is found that the winding density is important for the winding stability of the nonwoven fabric roll. It came to.

That is, the present invention is as follows.
(1) A nonwoven fabric roll having a nonwoven fabric roll having a winding density (weight per unit area x winding length / cross-sectional area) of 0.175 g / cm ³ ≦ (winding density) ≦ 0.400 g / cm ³ .
(2) The nonwoven fabric roll according to the above item 1, wherein the thickness ratio of the inner layer to the outer layer of the nonwoven fabric roll is 0.65 ≦ (inner layer thickness / outer layer thickness) ≦ 1.00 .
(3) The nonwoven fabric roll according to item 1 or 2, wherein the roll diameter of the nonwoven fabric roll is 30 cm or more, and the roll slip strength of the roll is 8.0 N · m or more.
(4) The nonwoven fabric roll according to any one of the above items 1 to 3, wherein the winding deviation is 0 to 8 mm.
(5) The nonwoven fabric roll according to any one of the above items 1 to 4, wherein the paper tube deviation is 0 to 8 mm.
(6) The nonwoven fabric roll according to any one of 1 to 5 above, wherein a difference in winding diameter is 0 to 8 mm.
(7) The nonwoven fabric roll according to any one of 1 to 6 above, wherein the nonwoven fabric has a surface friction coefficient MIU of 0.050 to 0.400.
(8) The nonwoven fabric roll as described in any one of 1 to 7 above, wherein a hydrophobic paper tube is used for the winding core.
(9) The nonwoven fabric roll according to any one of 1 to 8 above, wherein the both end surfaces of the nonwoven fabric roll or the most end surfaces of the plurality of nonwoven fabric rolls are suppressed with a curing sheet and packaged with a film.
(10) The nonwoven fabric roll according to any one of (1) to (9), wherein the nonwoven fabric is made of thermoplastic fibers.
(11) The nonwoven fabric roll as described in (10) above, wherein the thermoplastic fiber contains at least a polyolefin fiber.
(12) The nonwoven fabric roll as described in (11) above, wherein the polyolefin fiber contains at least a polypropylene fiber.
(13) The nonwoven fabric roll according to any one of (1) to (12) above, wherein the nonwoven fabric comprises a long fiber nonwoven fabric.
(14) The nonwoven fabric roll according to any one of items 1 to 13, which is used as a sanitary material application.

  According to the present invention, even a non-woven fabric having a good texture and a soft surface and having a good surface slipperiness, the winding at the time of winding is small, the texture as a non-woven fabric is not impaired, and the slit is stably and long. A wound non-woven roll can be provided. In addition, it is possible to provide a product with good handleability because it is difficult for deformation wrinkles due to compression even after packing.

The present invention is described in detail below.
The method for producing the nonwoven fabric for forming the nonwoven fabric roll of the present invention is not particularly limited, and short fibers by so-called carding or papermaking may be used. In the case of short fibers, a web is prepared by a wet papermaking method or an air-laying method, heated to a temperature at which the heat-fusible fibers are fused, and the intersections of the fibers are heat-fused to form a nonwoven fabric. As a method of heat sealing, any method such as an air-through method, a calender roll method, an embossing roll method, an ultrasonic method, etc. may be used.

  From the viewpoint of productivity, the fibers constituting the nonwoven fabric are preferably continuous filaments, and preferably contain long fibers. For example, a continuous filament melt-spun by the spunbond method (S) is used as a web, and is formed by bonding the web. Moreover, it is good also as a laminated | stacked web by spraying the web melt-spun by the melt blow method (M) on the web formed by the spun bond method (S). From the viewpoint of productivity, the state of lamination may be laminated with SS, SSS, SSSS, or may be laminated like SM, SMS, SMMS, SMSMS. These webs can be joined using adhesives, low-melting fibers and composite fibers, melt-bonding with a hot melt binder applied during web formation, or entanglement of fibers by needle punching and water flow. However, from the viewpoint of high-speed productivity, it is preferable to join by partial thermocompression bonding. For example, heated embossing that can provide a joint point such as a pinpoint shape, an elliptical shape, a diamond shape, or a rectangular shape. / Can be done through the web between flat rolls. The thermocompression bonding area ratio in partial thermocompression bonding is preferably 5 to 40%, more preferably 5 to 25%, from the viewpoint of strength retention and flexibility.

  The fibers constituting the non-woven fabric are preferably thermoplastic fibers, but are preferably fibers that do not have stickiness from the viewpoint of stability during unwinding. Examples of the thermoplastic fiber include polyolefin fibers such as polyethylene fibers, polypropylene fibers and copolymer polypropylene, polyester fibers such as polyethylene terephthalate fibers, polybutylene terephthalate fibers, polyethylene naphthalate fibers and copolymer polyesters, and nylon-6 fibers. Polyamide fibers such as nylon-66 fiber and copolymer nylon, and biodegradable fibers such as polylactic acid, polybutylene succinate and polyethylene succinate are used.

Especially, it is preferable that the polyolefin-type fiber is included from a viewpoint of texture. For example, the fiber which consists of resin, such as a copolymer of polyethylene, a polypropylene, those monomers, and another alpha olefin, is mention | raise | lifted. Polypropylene may be a polymer synthesized by a general Ziegler Natta catalyst, or may be a polymer synthesized by a single site active catalyst typified by metallocene. Other α-olefins have 3 to 10 carbon atoms, and specifically include propylene, 1-butene, 1-pentene, 1-hexane, 4-methyl-1-pentene and 1-octene. It is done. These may be used alone or in combination of two or more. In the case of a combination with an adhesive resin, the content of the adhesive resin is preferably 50% by weight or less in terms of handling and the like. When a composite fiber is used, it may be a core sheath, side-by-side, split fiber or mixed fiber. Further, the fiber shape includes not only ordinary circular fibers but also specially shaped fibers such as crimped fibers and hollow fibers. In particular, it is preferable that the main component is polypropylene from the viewpoint of strength and dimensional stability. Further, the polypropylene component is preferably 75% by weight or more, particularly preferably 90% by weight or more.
Further, the thermoplastic fiber may be blended with a nucleating agent, a flame retardant, an inorganic filler, a pigment, a colorant, a heat stabilizer, an antistatic agent, and the like.

Further, the average single yarn fineness of the fibers constituting the nonwoven fabric is preferably 0.7 dtex or more and 3.5 dtex or less, more preferably 0.7 dtex or more and 3.0 dtex or less. From the viewpoint of spinning stability, it is preferably 0.7 dtex or more, and from the viewpoint of the texture and strength of the nonwoven fabric, it is preferably 3.5 dtex or less.
Basis weight of the nonwoven fabric forming the nonwoven fabric roll of the present invention is preferably 8~80g / m ^2, is 10 to 50 g / m ² in terms of texture of the nonwoven fabric more preferred.

The paper tube used for the core of the nonwoven fabric roll of the present invention is preferably a general paper paper tube, but may be made of resin such as polystyrene or polypropylene. In view of cost, a paper tube is often used. As long as it is a non-woven fabric having hygroscopicity or a non-woven fabric subjected to a hydrophilic treatment, a hydrophobic paper tube laminated with a resin or a resin such as polyethylene is more preferable.
In addition, the outer diameter size of the paper tube used for the core of the nonwoven fabric roll is not limited, but it is preferably 50 mm or more from the viewpoint of ease of winding because wrinkles or the like are likely to enter at the beginning of winding. 200 mm or less is preferable from the viewpoint of loading efficiency in terms of surface. Further, if the thickness of the paper tube is less than 4 mm, crushing is likely to occur, and a thickness of 4 mm or more is preferable.

  The facility for winding the nonwoven fabric is not particularly limited, and may be a general center drive type or surface drive type capable of adjusting the winding tension. Furthermore, if a restraining roller is used, the restraining pressure can be adjusted, which is preferable in that it can be wound more stably. Moreover, the slit to the required required width | variety may be methods, such as a shear cut, a score cut, or a leather cut, and is not specifically limited.

The winding density of the nonwoven fabric roll of the present invention is a value calculated by the basis weight of nonwoven fabric × roll winding length / roll cross-sectional area. The winding density is controlled mainly by the winding tension at the time of winding. In general, the lower the winding tension, the softer the winding tension, and the higher the winding tension, the harder the winding tension. The range of the winding tension varies depending on the characteristics of the nonwoven fabric to be wound, but is generally preferably adjusted in the range of 20 to 80 N / m. The winding density of the nonwoven fabric roll needs to be 0.175 to 0.400 g / cm ³ . If it is less than 0.175 g / cm ³ , paper tube misalignment, in which the paper tube comes out in the direction perpendicular to the end face of the nonwoven fabric roll, is likely to occur, and it may come off the roll completely. Moreover, the winding deviation of the nonwoven fabric in which the end surfaces of the rolls are not aligned easily occurs. When the winding density exceeds 0.400 g / cm ³ , winding misalignment and paper tube misalignment are likely to occur, and the texture of the nonwoven fabric is impaired by tightening. From the viewpoint of maintaining the texture, the winding density is more preferably 0.175 to 0.310 g / cm ³ . Particularly preferably, it is 0.175 to 0.250 g / cm ³ .

  Controlling the thickness ratio (inner layer thickness / outer layer thickness) between the inner layer and the outer layer of the nonwoven fabric roll while taking the above-mentioned winding density into consideration enables further stable winding. The ratio of the thickness of the inner layer to the outer layer of the nonwoven fabric roll can be adjusted by the winding tension at the time of winding.For example, when using a suppression roller, the pressure decreases as the winding starts and ends. It is also possible to adjust by lowering. The inner layer and the outer layer of the nonwoven fabric roll are defined as the inner layer within 10% of the paper tube side of the distance obtained by subtracting the radius of the paper tube from the radius of the nonwoven fabric roll, and the outer layer within the outermost 10% of the nonwoven fabric roll. The thickness of the inner layer and the thickness of the outer layer indicate the thickness of one nonwoven fabric at a position within the above ranges. The thickness ratio (inner layer thickness / outer layer thickness) of the inner layer and outer layer of the nonwoven fabric roll that can be stably wound is preferably 0.65 to 1.00. If the ratio of thickness is less than 0.65, a paper tube misalignment in which the paper tube comes out in the direction perpendicular to the end face of the nonwoven fabric roll is likely to occur, and it may come off the roll completely. Moreover, the winding deviation of the nonwoven fabric in which the end surfaces of the rolls are not aligned easily occurs. If the thickness ratio exceeds 1.00, winding deviation and paper tube deviation are likely to occur, and the texture of the nonwoven fabric is impaired by winding. From the viewpoint of maintaining the texture, the thickness ratio is more preferably 0.80 to 1.00, and particularly preferably 0.85 to 0.96.

The roll width of the nonwoven fabric roll of the present invention is not particularly limited, but a roll width of 60 mm or more is preferable from the viewpoint of winding stability. 80 mm or more is more preferable, and 100 mm or more is particularly preferable.
The roll diameter of the nonwoven fabric roll of the present invention can be said to be a roll diameter of 30 cm or more in the sense of a long roll. That is, the range not exceeding the roll diameter of 30 cm can be easily wound without considering the problem solving means of the present invention. More preferably, it is 50 cm or more, More preferably, it is 70 cm or more. The range within 150 cm is preferable in terms of winding stability.

The nonwoven fabric roll of the present invention preferably has a roll slip strength representing the degree of tightening of at least 8.0 N · m. It is more preferably 10.0 N · m or more, and particularly preferably 12.0 N · m or more. When the roll slip strength is less than 8.0 N · m, paper tube misalignment and paper tube slip are likely to occur, and it is difficult to maintain a stable roll form. The roll slip strength can be adjusted with the winding tension at the time of winding.For example, when using a suppression roller, it is also possible to adjust the roll slip strength by decreasing the suppression pressure from the beginning of winding to the end of winding. is there.
If the texture of the nonwoven fabric is maintained, the roll slip strength is preferably as large as possible. However, it is preferably 150 N · m or less, and preferably 100 N · m or less, as a guideline for preventing excessive tightening.

The winding deviation of the nonwoven fabric roll of the present invention is preferably 0 to 8 mm. Winding misalignment refers to a state in which the nonwoven fabric is wound without being aligned with the end face of the roll when the nonwoven fabric roll is formed. That is, as the winding deviation distance increases, the winding is unstable. The winding deviation is more preferably within 5 mm from the viewpoint of stability in the processing step of the nonwoven fabric roll.
The paper tube deviation of the nonwoven fabric roll of the present invention is preferably 0 to 8 mm. Paper tube misalignment refers to a state where the paper tube is not aligned with the end surface of the nonwoven fabric roll when forming the nonwoven fabric roll. That is, the more the paper tube misalignment is, the more unstable the winding is. The deviation of the paper tube is more preferably within 5 mm from the viewpoint of stability in the processing step of the nonwoven fabric roll.
It is preferable that the roll diameter difference of the nonwoven fabric roll of this invention is 0-8 mm. The difference in the winding diameter indicates the unevenness of the surface of the nonwoven fabric roll, and is the difference between the maximum diameter and the minimum diameter in the width direction. That is, the larger the winding diameter difference, the more unstable the winding. The winding diameter difference is more preferably within 5 mm from the viewpoint of stability in the processing step of the nonwoven fabric roll.

  The surface friction coefficient MIU of the nonwoven fabric forming the nonwoven fabric roll of the present invention is preferably 0.050 to 0.400. When the surface friction coefficient MIU exceeds 0.400, it becomes easy to cause the roll to be taken during the process or to tighten the nonwoven fabric roll. In addition, when the surface friction coefficient MIU is less than 0.050, meandering or rolling due to slipping is likely to occur during the process. The surface friction coefficient MIU is more preferably 0.100 to 0.350, and particularly preferably 0.100 to 0.300.

  Since the nonwoven fabric roll of the present invention does not cause defects such as deformation wrinkles or scratches due to compression load during handling after packing, the both ends of the nonwoven fabric roll, or the outermost ends of a plurality of arranged nonwoven fabric rolls are suppressed with a curing sheet, and a film It is preferable to package with. Arranging a plurality of layers means arranging the end surfaces of the nonwoven fabric rolls so that the end surfaces are aligned so that the cores of the rolls are aligned. When arranging a plurality, it is common to arrange the same roll diameter. The outermost end surfaces are end surfaces that are outside the rolls arranged at both ends of a plurality of non-woven fabric rolls arranged. When packing, the outermost end surfaces may be cured with a curing sheet.

  The curing sheet is not particularly limited, and may be made of a thermoplastic resin such as polystyrene or polypropylene, or may be paper cardboard or cardboard. The size of the curing sheet is generally matched to the roll diameter size of the nonwoven fabric roll. When handling non-woven rolls after packing, the rolls are often stacked vertically in terms of transport and loading efficiency. For this reason, at least the diameter of the curing sheet on the roll end surface serving as the lower surface is preferably in the range of roll diameter ± 10 mm because the curing effect of the corners of the roll is large. Moreover, the range of -10 mm-+5 mm is more preferable from points, such as a tear of a packaging film.

  The film used for the packaging is not particularly limited, but a polyolefin-based thermoplastic resin film such as polyethylene having moisture impermeability which is not easily affected by environmental changes such as temperature and humidity during storage of the nonwoven fabric roll is preferable. Moreover, you may pack a nonwoven fabric roll using an automatic packing machine by hand packaging. It is preferable that the nonwoven fabric roll is wrapped and wrapped with a shrinkable film in terms of easy fixing. Furthermore, since the rolls are often stacked vertically during handling as described above, it is preferable that at least the corners which are the lower surfaces are wound more than the upper surfaces because the curing effect of the roll corners is large.

Although the nonwoven fabric which forms the nonwoven fabric roll of the present invention is not limited, it is particularly effective as a nonwoven fabric roll wound up stably and a nonwoven fabric roll excellent in handling after packing, especially for a nonwoven fabric having a good texture. is there.
Examples of the non-woven fabric having a good texture include a non-woven fabric in which a hydrophilic agent is attached to the non-woven fabric and a non-woven fabric containing a softening agent.

As a hydrophilizing agent that adheres to the nonwoven fabric, in consideration of safety to the human body and safety in the process, nonionic active agents in which ethylene oxide is added to higher alcohols, higher fatty acids, alkylphenols, etc., alkyl phosphates A single or mixture of anionic active agents such as salts and alkyl sulfates is preferably used.
Moreover, although the adhesion amount of a hydrophilizing agent changes with performance requested | required, for example, for sanitary materials, the range of 0.1-1.0 wt% is preferable normally with respect to a fiber, and it is 0. 2 to 0.6 wt% is more preferable.

  As a method of applying the hydrophilizing agent, existing methods such as a dipping method, a spraying method, and a coating (kiss coater, gravure coater) method can be generally employed using a diluted hydrophilizing agent, and as a drying method at that time Can be a known method using convective heat transfer, conduction heat transfer, radiant heat transfer, or the like, and can also be a drying method using hot air or infrared rays or a drying method using thermal contact.

Moreover, as a softening agent contained in a nonwoven fabric, it is preferable that it is an ester compound, for example, More preferably, the ester compound of a 3-6 valent polyol and monocarboxylic acid is used.
Examples of the trivalent to hexavalent polyols include trivalent polyols such as glycerin and trimethylolpropane, tetravalent polyols such as pentaerythritol, glucose, sorbitan, diglycerin and ethylene glycol diglyceryl ether, triglycerin and trimethylolpropane diene. Examples include pentavalent polyols such as glyceryl ether, hexavalent polyols such as sorbitol, tetraglycerin, and dipentaerythritol.

  Examples of the monocarboxylic acid include octacarboxylic acid, dodecanoic acid, tetradecanoic acid, octadecanoic acid, docosanoic acid, hexacosanoic acid, octadecenoic acid, docosenoic acid and isooctadecanoic acid, and other alicyclic monocarboxylic acids such as cyclohexanecarboxylic acid. Aromatic monocarboxylic acids such as benzoic acid and methylbenzenecarboxylic acid, hydroxyaliphatic monocarboxylic acids such as hydroxypropionic acid, hydroxyoctadecanoic acid and hydroxyoctadecenoic acid, and sulfur-containing aliphatic monocarboxylic acids such as alkylthiopropionic acid Etc.

  The ester compound used as the softening agent need not be a single component, and may be a mixture of two or more. Oils and fats derived from natural products may be used. However, since ester compounds containing unsaturated fatty acids are easily oxidized and easily deteriorated during melt spinning, saturated aliphatic monocarboxylic acids or aromatic monocarboxylic acids are preferred. When natural oils and fats are used, hydrogenated ester compounds are preferably used because they are odorless and stable compared to raw material oils.

It is important that the ester compound has a relatively high molecular weight of monocarboxylic acid and high lipophilicity. In the case of a polyolefin-based fiber, since it has high lipophilicity, it enters the amorphous part and inhibits crystallization to increase the amorphous region, so that flexibility can be obtained.
The content of the ester compound is preferably 0.3 wt% or more and 5.0 wt% or less with respect to the thermoplastic fiber. Even when the ester compound is added in a small amount, the bending flexibility and slipperiness are remarkably improved, and even if the content is increased, the performance improvement corresponding to the content is not observed. From this, considering the spinnability and smoke generation, 5.0 wt% or less is appropriate, more preferably 0.5 wt% to 3.5 wt%, particularly preferably 0.5 wt% to 2.0 wt%. .

  Since the nonwoven fabric roll of the present invention is stably wound and excellent in handling and processing suitability, it is particularly preferable for use as sanitary materials such as disposable diapers, sanitary napkins and incontinence pads that require a texture. In addition, non-woven fabrics for applications such as masks, warmers, tape base fabrics, tarpaulin base fabrics, patch base fabrics, first aid adhesive base fabrics, packaging materials, wipe products, medical gowns, bandages, clothing and skin care sheets Can be used as a roll.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention concretely, this invention is not limited only to these Examples. In addition, the evaluation method of each characteristic is as follows.
1. Average single yarn fineness (dtex)
The nonwoven fabric was cut off by 1 cm square at an arbitrary location so that there were 5 locations in the width direction of the nonwoven fabric to be measured, and the fiber diameter of the nonwoven fabric surface layer was measured at 20 points using a microscope, and the fineness was calculated from the average value. .

2. Non-woven surface friction coefficient MIU
The MIU in the present invention uses a friction tester KES-SE (manufactured by Kato Tech), cuts a non-woven fabric of 30 cm (MD direction) × 3 cm (CD direction), and attaches it by applying a predetermined load of 20 g / cm. ,It was measured. A friction element and a sample in which ten contacts obtained by bending a piano wire with a diameter of 0.5 mm into a U-shape are arranged, and a standard measurement condition (SENS: H, SPEED: 1 mm / sec, pressure bonding pressure between the sample and the friction element: Friction at 50 gf) and MIU was measured. The vertical (MD) direction is measured three times, and the average is shown. A smaller value means less frictional resistance.

3. Roll slip strength (N · m)
Insert a rubber roll slip fixed shaft (paper tube inner surface contact rubber length 5 cm) into the paper tube of the non-woven roll, insert air into the shaft, apply a certain pressure, and tightly fix the inside of the paper tube and rubber. It was. Next, using a torque wrench, the roll slip fixed shaft was turned in the roll winding direction, and the strength when the paper tube was rotated was measured. That is, the roll slip strength indicates the degree of tightening of the nonwoven fabric around the paper tube. The lower the roll slip strength, the easier the paper tube slippage and paper tube slippage occur, and the paper tube during unwinding in the processing step. This means that problems such as slipping of the nonwoven fabric are likely to occur.

4. Roll diameter of non-woven roll (cm)
The nonwoven fabric roll was rolled and placed on the floor surface, and the distance from the floor surface to the top of the nonwoven fabric roll through the center of the end surface of the nonwoven fabric roll was measured using a ruler. This was measured at both end faces, and one third of the roll was rolled and measured in the same manner, and one third of the roll was rolled and measured in the same manner. The average value of a total of 6 points measured at 3 points on one end face and 3 points on the other end face was taken as the roll diameter of the nonwoven fabric roll.

5. Roll inner and outer layer thickness (mm)
The inner layer and outer layer of the nonwoven fabric roll are defined as the inner layer within 10% of the paper tube side of the distance obtained by subtracting the radius of the paper tube from the radius of the nonwoven fabric roll, and the outer layer within the outermost 10% of the nonwoven fabric roll. The thickness of the inner layer and the thickness of the outer layer indicate the thickness of a single nonwoven fabric at a position within the above ranges. Immediately after unwinding the nonwoven fabric roll, the thickness of the nonwoven fabric located in the range of the inner layer and the outer layer was arbitrarily measured with a peacock type thickness meter (100 g / cm ² ), and the average thickness was calculated.

6). Winding density (g / cm ³ )
The winding density (g / cm ³ ) of the nonwoven fabric roll is a value calculated by the basis weight of the nonwoven fabric × roll winding length / roll cross-sectional area. The fabric weight of the nonwoven fabric was measured at the same time as the above-mentioned thickness measurement by arbitrarily measuring the weight of three nonwoven fabric rolls of 1 m in the inner layer and outer layer, and measuring the value (roll width measured by a ruler × 1 m length × 3 sheets) ) Divided by the area value. The roll length of the nonwoven fabric was measured with a length measuring counter installed in a winder. Furthermore, the roll cross-sectional area of the nonwoven fabric was determined by obtaining the cross-sectional area from the roll diameter measured in 4 above and subtracting the paper tube outer diameter cross-sectional area used from that value.

7). Winding deviation (mm)
The difference between the outermost position and the innermost position of the end of the nonwoven fabric wound without being aligned with the end face of the nonwoven fabric roll was measured using a ruler.
8). Paper tube misalignment (mm)
The distance from the end of the paper tube that slipped out from the end face of the nonwoven fabric roll and the end position of the nonwoven fabric at the start of winding was measured using a ruler.

9. Roll diameter difference (mm)
The roll diameter difference of a nonwoven fabric roll shows the unevenness | corrugation difference of a roll surface, and is a difference of the largest diameter in a width direction, and the minimum diameter. Apply a horizontal plate in the width direction on the surface of the nonwoven fabric roll, measure the maximum gap between the horizontal plate and the nonwoven fabric surface with a ruler, and determine the difference between the maximum diameter and the minimum diameter in the width direction as the value of the winding diameter difference. did.

10. Solution viscosity measurement method (ηsp / c)
0.025 g of sample is dissolved in 25 ml of orthochlorophenol (OCP). Heat to 90 ° C (120 ° C if not soluble) and dissolve. The measurement is performed with a viscosity tube at a measurement temperature of 35 ° C., and the calculation is performed from the following equation.
ηsp / c = ((t−t ₀ ) / t ₀ ) / c
In the above formula, t ₀ is the solvent passage time (second), t is the solution passage time (second), and c is the number of g of solute per 1000 ml of the solution.

[Example 1]
While cooling a yarn melt-extruded from a spinning nozzle from the side of a spinning nozzle by a spunbond method using polypropylene resin (MFR measured under the conditions shown in Table 1 of JIS-K7210), air soccer or the like It was picked up by a traction puller. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. This web was conveyed, passed between heated embossed rolls having a partial thermocompression area ratio of 7%, and partially thermocompression bonded to obtain a nonwoven fabric with a basis weight of 18 g / m ² having a pinpoint-like dotted pattern. The fineness of the obtained nonwoven fabric was 2.0 dtex, and the surface friction coefficient MIU was 0.193.

While slitting the obtained nonwoven fabric to a width of 100 mm and adjusting the winding tension to be 60 N / m in a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The obtained nonwoven fabric roll had a winding diameter of 760 mm, a winding density of 0.201 g / cm ³ , and a roll slip strength of 25 N · m, and there was no problem in winding deviation, paper pipe deviation, and winding diameter difference. Moreover, the end surface of the nonwoven fabric roll was cured with a corrugated cardboard sheet having the same diameter as the roll diameter, and was automatically packed using a polyethylene shrink film so that the lower surface of the roll was wound twice more than the upper surface. The state of the nonwoven fabric roll after packing was free from deformation wrinkles due to handling. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

[Example 2]
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the winding tension was adjusted to 40 N / m. The resulting nonwoven fabric roll had a winding density of 0.190 g / cm ³ and a roll slip strength of 15 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 3
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the winding tension was adjusted to 25 N / m. The resulting nonwoven fabric roll had a winding density of 0.186 g / cm ³ and a roll slip strength of 10 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 4
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that a nonwoven fabric obtained with a basis weight of 17 g / m ² , a fineness of 1.1 dtex and a surface friction coefficient of 0.255 was slit into a width of 200 mm and wound up by 7000 m. The resulting nonwoven fabric roll had a winding density of 0.202 g / cm ³ and a roll slip strength of 35 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 5
As a softening agent, a master batch in which an octadecanoic acid glyceride (hydrogenated vegetable oil and fat) having a melting point of 86 to 90 ° C. (average melting point 88 ° C.) and a polypropylene resin is added and mixed at the time of polypropylene melt extrusion, and octadecanoic acid glyceride 1 A nonwoven fabric containing 25 wt%, having a basis weight of 17 g / m ² , a fineness of 1.1 dtex, and a surface friction coefficient of 0.182, slitting the nonwoven fabric to a width of 450 mm and winding up 7000 m, the nonwoven fabric as in Example 1. Got a roll. The resulting nonwoven fabric roll had a winding density of 0.200 g / cm ³ and a roll slip strength of 45 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 6
The nonwoven fabric obtained with a basis weight of 20 g / m ² and a fineness of 2.8 dtex was passed through a corona discharge treatment machine under the condition of a discharge amount of 40 W · min / m ² (discharge degree: 4.0 W / cm ² ). A hydrophilizing agent is applied by a spraying method and then dried, and a non-woven fabric having a hydrophilizing agent attached and fixed at 0.3 wt% and a surface friction coefficient MIU of 0.150 is obtained from an outer diameter of 81 mm laminated with a polyethylene resin. A non-woven fabric roll was obtained in the same manner as in Example 1 except that the above-described hydrophobic paper tube was used for winding while adjusting the winding tension to be 50 N · m. The resulting nonwoven fabric roll had a winding density of 0.206 g / cm ³ and a roll slip strength of 25 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.
Moreover, although the nonwoven fabric roll after packing was stored for one week in a room at a temperature of 40 ° C. and a humidity of 90%, a state in which the wetness of the paper tube was transferred to the nonwoven fabric was not observed.

Example 7
The nonwoven fabric obtained with a basis weight of 15 g / m ² and a fineness of 2.0 dtex was passed through a corona discharge treatment machine under a discharge amount of 40 W · min / m ² (discharge degree: 4.0 W / cm ² ). A hydrophilizing agent is applied by a spraying method and then dried, and a non-woven fabric having a hydrophilizing agent of 0.5 wt% attached and fixed and a surface friction coefficient MIU of 0.138 is laminated with a polyethylene resin from an outer diameter of 81 mm. A non-woven fabric roll was obtained in the same manner as in Example 1 except that the hydrophobic paper tube was adjusted so that the take-up tension was 45 N · m, slitted to a width of 100 mm, and taken up 12000 m. The resulting nonwoven fabric roll had a winding density of 0.191 g / cm ³ and a roll slip strength of 10 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 8
The nonwoven fabric obtained with a basis weight of 20 g / m ² and a fineness of 2.8 dtex was passed through a corona discharge treatment machine under the condition of a discharge amount of 40 W · min / m ² (discharge degree: 4.0 W / cm ² ). A hydrophilic agent is applied by a spraying method and then dried, and a non-woven fabric having a hydrophilic coefficient of 1.25 wt% attached and fixed and a surface friction coefficient MIU of 0.100 is laminated from an outer diameter of 81 mm laminated with a polyethylene resin. A non-woven fabric roll was obtained in the same manner as in Example 1 except that the winding tension was adjusted to 45 N · m using a hydrophobic paper tube, and slitting to a width of 60 mm and winding. The resulting nonwoven fabric roll had a winding density of 0.196 g / cm ³ and a roll slip strength of 8 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 9
While cooling a yarn melt-extruded from a spinning nozzle from the side of a spinning nozzle by a spunbond method using polypropylene resin (MFR measured under the conditions shown in Table 1 of JIS-K7210), air soccer or the like It was picked up by a traction puller. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. Next, a polypropylene resin (MFR1000) was melt sprayed from the spinning nozzle on the web by a melt blow method, and collected as a laminated web. Further, a web obtained by a spunbond method from a polypropylene resin (MFR measured under the conditions shown in Table 1 of JIS-K7210 is 60) was laminated. The collected laminated web (spunbond / meltblown / spunbond) is conveyed, passed between heated embossed rolls with a partial thermocompression area ratio of 12%, and partially thermocompressed to have an elliptical dot pattern 15 g / A non-woven fabric of m ² was obtained. The nonwoven fabric obtained had a spunbond fineness of 2.00 dtex and a surface friction coefficient MIU of 0.200.
The obtained nonwoven fabric was slit to a width of 395 mm, and wound on a paper tube having an outer diameter of 81 mm while taking up a winding tension of 65 N / m to obtain a nonwoven fabric roll. The resulting nonwoven fabric roll had a winding density of 0.182 g / cm ³ and a roll slip strength of 60 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 10
Yarn obtained by melt-extrusion of ethylene / propylene random copolymer resin (MFR measured under the conditions of Table 1 of JIS-K7210 of 24) having an ethylene component content of 4.3 mol% from a nozzle through a spunbond method While being cooled from the side near the spinneret, it was taken up by a towing take-up device such as an air soccer. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. This web was conveyed, passed between heated embossed rolls having a partial thermocompression area ratio of 7%, and partially thermocompression bonded to obtain a nonwoven fabric with a basis weight of 18 g / m ² having a pinpoint-like dotted pattern. The fineness of the obtained nonwoven fabric was 1.5 dtex, and the surface friction coefficient MIU was 0.192.
While slitting the obtained nonwoven fabric to a width of 200 mm and adjusting the winding tension to be 60 N / m on a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The resulting nonwoven fabric roll had a winding density of 0.218 g / cm ³ and a roll slip strength of 30 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 11
A nylon 6 resin melt-extruded from a spinning nozzle by a spunbonding method was taken up by a pulling take-up device such as an air soccer while cooling from the side near the spinning nozzle. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. This web was conveyed, passed between heated embossed rolls having a partial thermocompression area ratio of 11%, and partially thermocompression bonded to obtain a nonwoven fabric with a basis weight of 30 g / m ² having a pinpoint-like dotted pattern. The fineness of the obtained nonwoven fabric was 2.2 dtex, and the surface friction coefficient MIU was 0.310.
While slitting the obtained nonwoven fabric to a width of 300 mm and adjusting the winding tension to be 70 N / m in a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The resulting nonwoven fabric roll had a winding density of 0.181 g / cm ³ and a roll slip strength of 65 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 12
A yarn obtained by melting and extruding a general-purpose polyethylene terephthalate resin from a spinning nozzle by a spunbond method was taken from a side near the spinning nozzle by a pulling / pulling device such as an air soccer. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. The web was conveyed, passed between heated embossed rolls having a partial thermocompression area ratio of 11%, and partially thermocompression bonded to obtain a nonwoven fabric with a basis weight of 50 g / m ² having a rectangular dotted pattern. The fineness of the obtained nonwoven fabric was 2.0 dtex, and the surface friction coefficient MIU was 0.350.
While slitting the obtained nonwoven fabric to a width of 150 mm and adjusting the winding tension to 80 N / m in a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The resulting nonwoven fabric roll had a winding density of 0.223 g / cm ³ and a roll slip strength of 40 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 13
Polyolefin-based heat-fusible conjugate fiber made of high-density polyethylene having a single yarn fineness of 2.7 dtex, a fiber length of 20 mm, a sheath component of melting point 130 ° C., and a core component of melting point 165 ° C. by a wet process, Heat treatment was performed at a temperature of 125 ° C. by an air-through method to obtain a nonwoven fabric composed of a polyolefin-based heat-fusible conjugate fiber. The resulting nonwoven fabric had a surface friction coefficient MIU of 0.145.
While slitting the obtained nonwoven fabric to a width of 150 mm and adjusting the winding tension to 45 N / m in a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The resulting nonwoven fabric roll had a winding density of 0.244 g / cm ³ and a roll slip strength of 15 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 14
A yarn obtained by melting and extruding a general-purpose polyethylene terephthalate resin from a spinning nozzle by a spunbond method was taken from a side near the spinning nozzle by a pulling / pulling device such as an air soccer. The yarn exiting the pulling / drawing device was passed through a charging device, opened, and then collected as a web on a moving wire mesh conveyor. Next, polyethylene terephthalate (solution viscosity ηsp / c 0.50) was melt sprayed from the spinning nozzle on the web by a melt blow method and collected as a laminated web. Further, a web obtained from a general-purpose polyethylene terephthalate resin by a spunbond method was laminated. The collected laminated web (spunbond / meltblown / spunbond) is conveyed, passed between heated embossed rolls with a partial thermocompression area ratio of 14.4%, and partially thermocompressed to have a textured dot pattern. A nonwoven fabric having a basis weight of 40 g / m ² was obtained. The resulting nonwoven fabric had a spunbond fineness of 1.50 dtex and a surface friction coefficient MIU of 0.300.
While slitting the obtained nonwoven fabric to a width of 500 mm and adjusting the winding tension to 70 N / m on a paper tube having an outer diameter of 81 mm, the nonwoven fabric roll was obtained. The resulting nonwoven fabric roll had a winding density of 0.307 g / cm ³ and a roll slip strength of 70 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 15
A nonwoven fabric roll was obtained in the same manner as in Example 6 except that a paper tube having an outer diameter of 81 mm was used. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1. Moreover, when the nonwoven fabric roll after packing was stored for one week in a room at a temperature of 40 ° C. and a humidity of 90%, the wet state of the paper tube was transferred to the nonwoven fabric.

Example 16
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the end face of the nonwoven fabric roll was not cured with a corrugated cardboard sheet. As for the state of the nonwoven fabric roll after packing, there was no deformation wrinkle at the end face of the roll at the time of handling, but a dent was found. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 17
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the upper surface of the end face of the nonwoven fabric roll was roll diameter size and the lower surface was cured with a corrugated cardboard sheet having a roll diameter size of -20 mm. The state of the non-woven roll after packing was free from deformation wrinkles, but dents were found at the corners of the roll end surface that was the lower surface. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Example 18
The polypropylene resin used in Example 1 has a sticking property and a low melting point polypropylene resin polypropylene elastomer having a melting point of 104 ° C. (MFR measured under the conditions of Table 1 of JIS-K7210 is 25 wt%). As described above, it was added and mixed at the time of melt extrusion, the basis weight of the obtained nonwoven fabric was 17 g / m ² , the fineness was 1.1 dtex, the surface friction coefficient was 0.265, and the obtained nonwoven fabric was 350 mm wide. A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the film was slit to 7000 m and wound up by 7000 m. The resulting nonwoven fabric roll had a winding density of 0.220 g / cm ³ and a roll slip strength of 65 N · m. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

[Comparative Example 1]
A nonwoven fabric roll was obtained in the same manner as in Example 1 except that the winding tension was adjusted to 15 N / m. The resulting nonwoven fabric roll had a winding density of 0.172 g / cm ³ and a roll slip strength of 5 N · m. Further, winding deviation was 11 mm and paper tube deviation was 10 mm, which was not stable winding. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

[Comparative Example 2]
A non-woven fabric roll of short fibers was obtained in the same manner as in Example 13 except that the winding tension was adjusted to 85 N / m. The resulting nonwoven fabric roll had a winding density of 0.522 g / cm ³ and a roll slip strength of 40 N · m. Further, the winding deviation was 9 mm and the paper tube deviation was 10 mm, and the winding was not stable. Further, due to the tightening, the thickness of the nonwoven fabric was crushed and the texture was impaired. The evaluation results of the obtained nonwoven fabric roll are shown in Table 1.

Table 1 shows the following.
Even if the nonwoven fabric roll of the present invention has a good texture and is soft and has a good surface slipperiness, it has a small length of winding and does not impair the texture as a nonwoven fabric, and can be slit stably and long. A wound non-woven roll can be provided. In addition, it is possible to provide a product with good handleability because it is difficult for deformation wrinkles to enter the end faces and corners after packing.

  Since the nonwoven fabric roll of the present invention is stably wound and is excellent in handleability and processing suitability as a product, including sanitary materials such as disposable diapers, sanitary napkins and incontinence pads that are particularly required for the texture, For example, as non-woven rolls for applications such as masks, warmers, tape base fabrics, tarpaulin base fabrics, patch medicinal base fabrics, first aid base fabrics, packaging materials, wipe products, medical gowns, bandages, clothing and skin care sheets Can be used.

Claims (12)

Nonwoven fabric in which a nonwoven fabric composed of at least one thermoplastic fiber selected from the group consisting of polyolefin fiber, polyester fiber, polyamide fiber, polylactic acid, polybutylene succinate, and polyethylene succinate is wound around a core a roll, the range is 0.175 g / cm ³ ≦ (winding density) of the winding density of the nonwoven fabric roll (basis weight × winding length / cross-sectional area) Ri ≦ 0.400 g / cm ³ der, and the nonwoven fabric roll The range of the ratio of the thickness of the inner layer to the outer layer is 0.65 ≦ (inner layer thickness / outer layer thickness) ≦ 1.00 . The roll diameter of the nonwoven fabric roll is not less 30cm or more, and, roll slip strength Ru der than 8.0 N · m, the nonwoven fabric roll according to 請 Motomeko 1. Winding deviation Ru 0~8mm der, nonwoven roll according to claim 1 or 2. Paper tube displacement Ru 0~8mm der, nonwoven roll according to any one of claims 1-3. Winding diameter difference Ru 0~8mm der, nonwoven roll according to any one of claims 1-4. The surface friction coefficient MIU nonwovens Ru der 0.050 to 0.400, the nonwoven fabric roll according to any one of claims 1-5. Wherein a winding core that have used hydrophobic paper tube, nonwoven roll according to any one of claims 1-6. Wherein both end faces of the nonwoven fabric roll, or more side by side and the top end surfaces of the nonwoven fabric roll, kept at the reflux sheets, packaged in a film, nonwoven fabric roll according to any one of claims 1-7. Said thermoplastic fibers including at least polyolefin fibers, nonwoven roll according to any one of claims 1-8. Wherein a polyolefin fiber Gapo polypropylene fibers, non-woven fabric roll according to claim 9. The nonwoven fabric including the long-fiber nonwoven fabric, the nonwoven fabric roll according to any of claims 1-10. Ru is used as a hygienic material applications, nonwoven roll according to any one of claims 1 to 11.