String-like material and manufacturing method thereof, agricultural inducing string and packing string

Abstract

To provide a string-like material that allows desired twisting to be formed so that the twisted shape is easily maintained, and has excellent handleability, and also to provide a manufacturing method thereof.SOLUTION: A string-like material is formed by twisting a belt-like nonwoven fabric. The belt-like nonwoven fabric has a plurality of portions that are aligned in a direction intersecting with a longitudinal direction of the string-like material, extend along the longitudinal direction, and have different basis weights. The plurality of portions include a first portion and a second portion having the basis weight smaller than the basis weight of the first portion.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present disclosure relates to strings and methods for manufacturing the same, as well as agricultural attractant strings and baling strings. [Background technology]

[0002] Patent Documents 1 to 3 propose cutting a nonwoven fabric into string-like shapes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-279962 [Patent Document 2] Japanese Patent Application Publication No. 08-126437 [Patent Document 3] Japanese Patent Application Publication No. 06-073676 Summary of the Invention [Problem to be solved by the invention]

[0004] There is room for improvement in the processability of the above-mentioned nonwoven fabric and the handleability of the obtained string-like material. An object of the present disclosure is to provide a string-like material obtained from a nonwoven fabric, which can be formed into a desired twist, which easily maintains the twisted shape, and which also has excellent handleability. [Means for solving the problem]

[0005] The present disclosure provides: A string-like object formed by twisting strip-shaped nonwoven fabric, The strip-shaped nonwoven fabric has a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction, The plurality of portions provide a string-like material including a first portion and a second portion having a basis weight smaller than that of the first portion.

[0006] The present disclosure also provides A method for producing a string-like object, Obtaining a strip-shaped nonwoven fabric including a first portion and a second portion having a basis weight smaller than that of the first portion from a raw nonwoven fabric having a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction; and twisting the strip-shaped nonwoven fabric so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material. [Effects of the Invention]

[0007] According to the present disclosure, a string-like material is provided that can form a desired twist, that is likely to maintain the twisted shape, and that has excellent handleability. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a top view schematically illustrating an example of a strip-shaped nonwoven fabric. [Figure 2] FIG. 2 is a top view schematically showing how a string-like object is produced from the strip-like nonwoven fabric shown in FIG. [Figure 3] FIG. 10 is a top view schematically showing another example of a strip-shaped nonwoven fabric. [Figure 4] FIG. 4 is a top view schematically showing how a string-like object is produced from the strip-shaped nonwoven fabric shown in FIG. [Figure 5A] FIG. 2 is a perspective view showing an example of a roll of nonwoven fabric in a developed state. [Figure 5B] FIG. 10 is a perspective view showing edge processing. [Figure 5C] FIG. 2 is a perspective view showing how a raw nonwoven fabric is cut. DETAILED DESCRIPTION OF THE INVENTION

[0009] The string-like material of the present disclosure is formed by twisting strip-shaped nonwoven fabrics. The strip-shaped nonwoven fabrics have first and second portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction. The multiple portions with different basis weights that extend along the longitudinal direction make it easier to form the desired twist and to maintain the twisted shape. In addition, handleability is improved.

[0010] Hereinafter, the overall performance relating to the ease with which a twist can be formed and the ease with which the twisted shape can be maintained may be collectively referred to as twist processability. A string-like material with excellent twist processability also has high binding properties.

[0011] The twist processability can be evaluated, for example, by tensile strength, elongation, and stress at 5% elongation (5% modulus). The stress at 5% elongation is the force required to elongate a sample by 5%.

[0012] If the tensile strength is too low, the twisted shape is difficult to maintain and the twist may come undone. Also, if the tensile strength is too low, the string-like material may easily break during use. The same applies if the elongation is too low. If the stress at 5% elongation is too high, it is difficult to obtain the desired twist because twisting is difficult, and the twisted shape is also difficult to maintain.

[0013] The handleability of a string-like material specifically refers to its performance in terms of the load it places on the skin. Excellent handleability means that the material feels good on the skin and does not cut the skin even when gripped tightly. A string-like material with excellent handleability is less likely to cause external injuries.

[0014] The handleability of a string-like material can be evaluated, for example, by its tensile strength. If the tensile strength is too high, the string-like material becomes hard and does not feel good against the skin. Therefore, gripping the string-like material too tightly may cut the skin.

[0015] The cord-like material may be used in an environment where it is exposed to rain, and the ease of maintaining the twisted shape and the ease of handling are performances that may be required of the cord-like material even in a wet state.

[0016] The strip-shaped nonwoven fabric is twisted so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material. The portions with different basis weights extend side by side along the MD direction, and the resulting string-like material exhibits excellent twisting processability and handleability.

[0017] The second portion with a smaller basis weight enhances the texture of the nonwoven fabric and improves its feel against the skin. The second portion primarily improves handling. The second portion with a smaller basis weight also improves twistability.

[0018] The first portion, which has a large basis weight, increases the strength of the nonwoven fabric and controls the stress during elongation within an appropriate range. The first portion mainly functions as a string-like material (typically, as a binding material).

[0019] The MD (machine direction) is the direction in which the nonwoven fabric moves during production, and is also called the machine direction. In the present disclosure, the MD direction corresponds to the longitudinal direction of the string-like material. The CD (cross direction) described below is the direction perpendicular to the MD direction.

[0020] Nonwoven fabric is defined in JIS L 0222 as "a fiber sheet, web or batt in which the fibers are oriented in one direction or randomly and are bonded by entanglement and / or fusion and / or adhesion, excluding paper, woven fabric, knitted fabric, tufted fabric and crepe felt."

[0021] A nonwoven fabric is obtained by subjecting a precursor formed from fibers to an entanglement treatment. The precursor of a nonwoven fabric is a fiber sheet, web, or batt in which the fibers are oriented in one direction or randomly, but the fibers are not bonded to each other. The method for producing the fiber layer before the entanglement treatment is not particularly limited. The web may be produced by a carded method, an airlaid method, a wet method, or the like, or by a hydroentanglement (spunlace) method, a spunbond method, or a wet method, or the like. Hereinafter, the fiber layer before the entanglement treatment may be referred to as a "web" for convenience.

[0022] The nonwoven fabric may be produced by a hydroentanglement method, a spunbond method, or a needlepunch method. The nonwoven fabric may be a hydroentangled nonwoven fabric produced by a hydroentanglement method.

[0023] Nonwoven fabric and raw nonwoven fabric are almost synonymous. Raw nonwoven fabric includes the main body of the nonwoven fabric to be used as a product and offcuts (edge ​​portions, described below). Nonwoven fabric may be the main body, offcuts, or may include the main body and offcuts. "Nonwoven fabric" may be read as "raw nonwoven fabric" in some cases, and "raw nonwoven fabric" may be read as "nonwoven fabric."

[0024] (fiber) First, the fibers used in this disclosure will be described. The type of fiber is not particularly limited. The fiber may be, for example, a natural fiber, a regenerated fiber, a synthetic fiber, or a semi-synthetic fiber. These may be used alone or in combination of two or more.

[0025] The classification of fiber materials follows, for example, the "Types of Fibers, etc." in the "Terminology for Fiber Names" published by the Consumer Affairs Agency (https: / / www.caa.go.jp / policies / policy / representation / household_goods / guide / fiber / fiber_term.html).

[0026] From the viewpoint of environmental conservation, the fibers may contain biodegradable fibers. Nonwoven fabrics mainly made of biodegradable fibers are biodegradable and contribute to the realization of a sustainable society. Examples of biodegradable fibers include cellulose fibers, natural fibers other than cellulose fibers (e.g., silk and wool), and biodegradable synthetic fibers.

[0027] Synthetic fibers are typically made of thermoplastic resins. The thermoplastic resin is not particularly limited. Examples of thermoplastic resins include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polyethylene naphthalate, polylactic acid, polybutylene succinate, and copolymers thereof; polyolefin resins such as polypropylene, polyethylene (including high-density polyethylene, low-density polyethylene, linear low-density polyethylene, etc.), polybutene-1, propylene copolymers (including propylene-ethylene copolymers and propylene-butene-1-ethylene copolymers) primarily composed of propylene, ethylene-vinyl alcohol copolymers, and ethylene-vinyl acetate copolymers; polyamide resins such as nylon 6, nylon 12, and nylon 66; acrylic resins; polyurethane resins; engineering plastics such as polycarbonate, polyacetal, polystyrene, and cyclic polyolefins, as well as elastomers thereof.

[0028] The fiber length of the synthetic fibers is not particularly limited and is appropriately selected depending on the material, its manufacturing method, web production method, entanglement treatment method, etc. The synthetic fibers may be short fibers with a fiber length of 100 mm or less, or long fibers with a fiber length of more than 100 mm. The fiber length may be 80 mm or less, or 60 mm or less.

[0029] The fineness of the synthetic fibers is, for example, 1.0 dtex or more and 4.0 dtex or less. The fineness of the synthetic fibers may be 0.6 dtex or more, 1.3 dtex or more, 1.5 dtex or more, or 1.6 dtex or more. The fineness of the synthetic fibers may be 4.0 dtex or less, 2.5 dtex or less, 2.4 dtex or less, or 2.2 dtex or less.

[0030] Biodegradable synthetic fibers are fibers made of biodegradable thermoplastic resins. Examples of biodegradable thermoplastic resins include polylactic acid and polybutylene succinate. Biodegradable synthetic fibers containing a biodegradation accelerator may also be used.

[0031] The fibers may include cellulose fibers. The type of cellulose fibers is not particularly limited. Examples of cellulose fibers include the following: (1) Natural fibers derived from plants such as cotton, flax, flax, ramie, jute, banana, bamboo, kenaf, shell ginger, hemp, and kapok; (2) solvent-spun cellulose fibers such as viscose-derived rayon and polynosic, cupra obtained by the cuprammonium process, and solvent-spun Tencel® and Lyocell, as well as other regenerated fibers; (3) Cellulose fibers obtained by melt spinning; (4) Semi-synthetic fibers such as acetate fibers; and (5) Pulp such as mechanical pulp, recycled pulp, and chemical pulp

[0032] The fineness of the cellulose fibers is not particularly limited. The fineness of the cellulose fibers may be 0.3 dtex or more and 6.0 dtex or less. The fineness of the first fibers may be 0.6 dtex or more, 0.8 dtex or more, or 1.0 dtex or more. The fineness of the cellulose fibers may be 6.0 dtex or less, 4.0 dtex or less, 3.0 dtex or less, or 2.0 dtex or less. In one embodiment, the fineness of the cellulose fibers is 0.6 dtex or more and 3.3 dtex or less. Since it is difficult to adjust the fineness of natural fibers, cellulose fibers with finenesses outside the above ranges may be used.

[0033] The fiber length of the cellulose fibers is not particularly limited and may be appropriately selected depending on the material, its manufacturing method, web production method, entanglement treatment method, etc. The cellulose fibers are, for example, short fibers. When the web is formed by a carding method, the fiber length of the cellulose fibers may be 100 mm or less, 75 mm or less, or 65 mm or less. The fiber length of the cellulose fibers may be 10 mm or more, 20 mm or more, or 30 mm or more. When the first and / or second fiber layer is formed from a carded web, the fiber length of the cellulose fibers in one embodiment is 10 mm or more and 100 mm or less. When the web is formed by an airlaid method, the fiber length of the cellulose fibers may be 2 mm or more and 20 mm or less.

[0034] (strip-shaped nonwoven fabric) The strip-shaped nonwoven fabric (hereinafter simply referred to as "strip") has at least a first portion and a second portion with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction.

[0035] "The basis weight of the first part and the second part is different" means that the difference in basis weight between the first part and the second part (W1 - W2) is 2.5 g / m 2 W1-W2 is 3.0g / m or more. 2 or more, and 2 W1-W2 may be 40 g / m or more. 2 may be less than or equal to 35 g / m 2 It may be the following:

[0036] Differences in basis weight are manifested, for example, in the transparency of the nonwoven fabric. When the boundary between the parts with different transparency can be identified over the entire length (longitudinal length) of the strip (when the boundary is continuous from one end of the strip to the other end in the longitudinal direction), this boundary is a boundary line that divides the strip based on differences in basis weight. The strip is divided into multiple parts at the boundary line, and the basis weight of each part is calculated. The part with the smallest basis weight is the second part. When the difference in basis weight from the second part is 2.5 g / m 2The portion that meets the above criteria is the first portion. Hereinafter, the length of the string-like object in the longitudinal direction will be simply referred to as the "length."

[0037] The boundary line should be visible along at least 25cm of the obi. In other words, when the obi is cut to a length of 25cm, if the boundary between the parts with different transparency can be seen along the entire length of the 25cm obi, this boundary should be regarded as the boundary line and the basis weight of each part should be calculated. If the difference in basis weight between the parts is 2.5g / m 2 In this case, (a portion of) the 25 cm long band has a first portion and a second portion aligned in a direction intersecting the longitudinal direction and extending along the longitudinal direction. When a portion of the band (at least 25 cm long) has the above-mentioned first portion and second portion, the band can be considered to be a band-shaped nonwoven fabric as used in the present disclosure. The other portions of the band do not necessarily have to have the above-mentioned first portion and second portion.

[0038] The boundary line may be visible between two portions having the same basis weight. The boundary line may be continuous from one end of the strip to the other end in the longitudinal direction. The boundary line may be linear or non-linear.

[0039] The intersection of the boundary line and one end of the obi in the length direction is called "start point A." The intersection of the boundary line and the other end of the obi in the length direction is called "end point B." The line segment that connects one end of the obi in the length direction and the other end of the obi in the shortest distance is called the "base line." The start and end points of the base line should not overlap with start point A and end point B. The line segment that connects start point A and end point B in a straight line is called the "imaginary line."

[0040] "The boundary line is straight" means the following: Calculate the difference (|X1-X2|) between the length X1 of the line segment created by drawing a line perpendicular to the reference line from any point on the reference line to the "imaginary line" and the length X2 of the line segment created by drawing a line perpendicular to the reference line from the same point to the "boundary line." Calculate the difference (|X1-X2|) for multiple arbitrary points, and if the maximum value of the difference (|X1-X2|) is less than 10% of the length X1, the boundary line is straight.

[0041] The term "non-linear boundary line" means that the maximum value of the difference (|X1-X2|) calculated as described above is 10% or more of the length X1. The shape of a non-linear boundary line may be, for example, an irregular wave shape or an irregular zigzag shape.

[0042] The non-linear boundary line is formed, for example, by moving the open end of the band toward the center by edge processing or the like, which will be described later.

[0043] There may be a plurality of second portions. "A plurality of second portions" means portions that have the same minimum basis weight and are spaced apart from each other or are adjacent to each other but can be distinguished by a boundary line.

[0044] There may be a plurality of first parts. "A plurality of first parts" refers to a first part having a basis weight 2.5 g / m less than that of the second part determined above. 2 The first portions have a basis weight equal to or greater than the above and are arranged apart from each other, or are adjacent to each other but can be distinguished by a boundary line. The basis weights of the plurality of first portions may be the same or different.

[0045] The plurality of first portions may include, for example, a portion 1a having the largest basis weight and a portion 1b having a smaller basis weight than the portion 1a. The portion 1b has a larger basis weight than the second portion.

[0046] There may be a plurality of 1a portions. "A plurality of 1a portions" means portions that have the same maximum basis weight and are spaced apart from each other or are adjacent to each other but can be distinguished by a boundary line.

[0047] There may be a plurality of 1b portions. "A plurality of 1b portions" refers to portions smaller than 1a portions and having a mass of 2.5 g / m or less than 2.5 g / m 2 The 1b portions refer to portions that have a basis weight of at least 1b and are arranged separately or adjacent to each other but can be distinguished by a boundary line. The basis weights of the multiple 1b portions may be the same or different.

[0048] The difference in basis weight between the 1a portion and the 1b portion (W1a-W1b) is not particularly limited. For example, W1a-W1b is 0 g / m 2 Super 35g / m 2 W1a-W1b is 1.0 g / m 2 or more, and 2 or more, and 2 or more, and 2 W1a-W1b may be 32.5 g / m or more. 2 may be less than or equal to 30 g / m 2 may be less than 25 g / m 2 may be less than 20 g / m 2 It may be the following:

[0049] There may also be a portion (middle portion) that does not correspond to either the first portion or the second portion. For example, the middle portion has a basis weight greater than that of the second portion, and the difference in basis weight between the middle portion and the second portion is 2.5 g / m 2 It is a part having a basis weight of less than 1000mm.

[0050] There may be multiple intermediate parts. "Multiple intermediate parts" refers to parts with a basis weight greater than that of the second part, and the difference in basis weight between them is 2.5 g / m 2 The intermediate portions have a basis weight of less than 1 / 2 mm and are spaced apart from each other or are adjacent to each other but can be distinguished by a boundary line. The basis weights of the intermediate portions may be the same or different.

[0051] The basis weight used to determine the first, second and intermediate portions is an average value. This is because even in portions divided by the above-mentioned boundary lines, there may be variations in transparency within the portions. The average basis weight can be obtained by measuring the mass of each portion and dividing this mass by the area of ​​each portion. Alternatively, an arbitrary area (typically 25 cm²) can be measured from each portion. 2At least five pieces having the same thickness may be cut out, the masses may be measured, the basis weight of each piece may be calculated, and then the masses may be averaged. A strip cut to an appropriate length (e.g., 25 cm) and an appropriate width (e.g., 1 cm) may be used to determine the first and second portions and measure the basis weight. The width is the length in the direction intersecting the longitudinal direction.

[0052] When the transparency gradually changes in the width direction, but the boundary line cannot be drawn as above, the band is divided into two equal parts and the basis weight of the two resulting parts is calculated. If the difference between these basis weights is 2.5g / m 2 If this is the case, the band may be considered to have a first portion and a second portion with different basis weights.

[0053] If the boundary is broken along the way (if the boundary does not continue from one end of the obi to the other end in the longitudinal direction), the boundary can be considered not to be a boundary line dividing the obi based on the difference in basis weight. The obi can be divided into each part without taking the boundary into consideration.

[0054] The arrangement of the first portion (including portions 1a and 1b), the second portion, and the intermediate portion is not particularly limited. The second portion may be sandwiched between multiple first portions, between a first portion and an intermediate portion, or between multiple intermediate portions. The second portion may be located between portions 1a and 1b. During twisting, the band is folded starting from the second portion, making twisting easier. In addition, handling is improved.

[0055] One 1a portion may be located at one end of the strip in the width direction, and one 1b portion may be located at the other end of the strip in the width direction, which makes it easier to maintain the twisted shape.

[0056] The basis weight W1 of the first portion is not particularly limited. For example, the basis weight W1 is 30 g / m 2 More than 200g / m 2 The basis weight W1 is 30 g / m or less. 2 When the weight W1 is 200 g / m or more, the twisting processability is further improved.2 When the weight W1 is 35 g / m or less, handling properties are not easily impaired. 2 or more, and 2 The basis weight W1 may be 195 g / m or more. 2 or less, and 2 may be less than or equal to 150 g / m 2 may be less than 100 g / m 2 It may be the following:

[0057] When there are multiple first portions, the basis weight W1 is the basis weight of each first portion. The basis weights W1a and W1b described below are also the basis weights of the individual 1a and 1b portions. The basis weight W1 is not the average value of the basis weights of the multiple first portions. The basis weight W1a is not the average value of the basis weights of the multiple 1a portions. The basis weight W1b is not the average value of the basis weights of the multiple 1b portions.

[0058] The basis weight W1a of the 1a portion is the same as the basis weight W1 of the 1st portion. The basis weight W1b of the 1b portion is, for example, 25 g / m 2 More than 160g / m 2 The basis weight W1b is 30 g / m 2 may be 35 g / m or more, 2 The basis weight W1b may be 155 g / m or more. 2 may be less than 150 g / m 2 may be less than 100 g / m 2 may be less than 80 g / m 2 It may be the following:

[0059] The basis weight W2 of the second portion is not particularly limited. For example, the basis weight W2 is 12 g / m 2 More than 80g / m 2 The basis weight W2 is 12 g / m 2 When the weight W2 is 80 g / m or more, twisting processability is unlikely to be impaired. 2 When the weight W2 is 27 g / m or less, the handling property is further improved. 2 or more, and 2 The basis weight W2 may be 75 g / m or more. 2may be less than 70 g / m 2 may be less than 60 g / m 2 may be less than 50 g / m 2 It may be the following:

[0060] When there are multiple second portions, the basis weight W2 is the basis weight of each second portion, and is not the average value of the basis weights of the multiple second portions.

[0061] The weight of the middle part, Wmid, is W2+2.5g / m 2 There are no particular limitations as long as Wmid>W2. The basis weight Wmid is appropriately set depending on the desired breaking strength, breaking elongation, stress at 5% elongation, and the like.

[0062] When there are multiple intermediate portions, the basis weight Wmid is the basis weight of each intermediate portion, not the average basis weight of the multiple intermediate portions.

[0063] The width Wd1 of the first portion is not particularly limited. From the viewpoint of twisting processability, the width Wd1 may be 35% or more and 90% or less of the width Wd of the band. The width Wd1 may be 40% or more, 42% or more, or 45% or more of the width Wd. The width Wd1 may be 87.5% or less, 85% or less, or 83% or less of the width Wd.

[0064] When one first portion exists, the width Wd1 is the average width of the first portion. The average width is calculated by averaging the widths at any three positions (the same applies below).

[0065] When there are multiple first portions (for example, portions 1a and 1b), the width Wd1 is the sum of the average widths of the first portions calculated as described above.

[0066] The widths of the 1a portion and the 1b portion are not particularly limited. The width Wd1a of the 1a portion may be 5% or more and 90% or less of the width Wd of the band. The width Wd1a may be 7% or more, 10% or more, or 15% or more of the width Wd. The width Wd1a may be 88% or less, 86% or less, or 84% or less of the width Wd.

[0067] The width Wd1b of portion 1b may be 0% or more and 30% or less of the width Wd of the band. The width Wd1b may be 2% or more, 4% or more, or 6% or more of the width Wd. The width Wd1b may be 28% or less, 25% or less, or 20% or less of the width Wd.

[0068] The width Wd2 of the second portion is not particularly limited. From the viewpoint of ease of handling, the width Wd2 may be 10% or more and 65% or less of the width Wd of the band. The width Wd2 may be 15% or more, 20% or more, or 25% or more of the width Wd. The width Wd2 may be 60% or less, 58% or less, or 55% or less of the width Wd.

[0069] When there is one second portion, the width Wd2 is the average width of the second portion. When there are multiple second portions, the width Wd2 is the total width of the multiple second portions.

[0070] The width Wdmid of the middle portion is not particularly limited and is set appropriately depending on the desired breaking strength, breaking elongation, stress at 5% elongation, and the like.

[0071] If there is one intermediate portion, the width Wdmid is the average width of the intermediate portion. If there are multiple intermediate portions, the width Wdmid is the total width of the multiple intermediate portions.

[0072] The width Wd of each portion is measured while the band is stretched so that the nonwoven fabric does not spread and there are no wrinkles. As described above, the width Wd1 of any one first portion is the average value of any three or more points in that first portion. The width Wd1 of any one first portion may be calculated by dividing the area of ​​that first portion by the length of the string-like material. The widths of the other portions are calculated in the same manner.

[0073] The first portion may contain pulp from the viewpoint of twist processability. The pulp increases the strength and elongation stress of the band. Generally, the pulp has a fineness of about 1.0 dtex to 4.0 dtex, and a fiber length of about 0.8 mm to 5.0 mm.

[0074] "The first portion contains pulp" means that the mass ratio of pulp to the mass of the fibers constituting the first portion (excluding, for example, the mass of binders and additives added during web production) is 5% by mass or more. The above-mentioned mass ratio of pulp may be 40% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 80% by mass or more, or even 100% by mass.

[0075] Tensile strength The tensile strength in the MD direction of the laminated nonwoven fabric under standard conditions (dry state) may be 20 N / 5 cm or more and 60 N / 5 cm or less. If the tensile strength under standard conditions is 20 N / 5 cm or more, the knots tend to become tight. If the tensile strength under standard conditions is 60 N / 5 cm or less, the handleability can be further improved. The tensile strength under standard conditions may be 22 N / 5 cm or more, 25 N / 5 cm or more, or 30 N / 5 cm or more. The tensile strength under standard conditions may be 58 N / 5 cm or less, 55 N / 5 cm or less, or 50 N / 5 cm or less.

[0076] The tensile strength in the MD direction of the laminated nonwoven fabric when wet may be 15 N / 5 cm or more and 90 N / 5 cm or less. If the tensile strength when wet is 15 N / 5 cm or more, knots tend to become tight. If the tensile strength when wet is 90 N / 5 cm or less, handleability may be further improved. The tensile strength when wet may be 17 N / 5 cm or more, 20 N / 5 cm or more, or 22 N / 5 cm or more. The tensile strength when wet may be 87.5 N / 5 cm or less, 85 N / 5 cm or less, 80 N / 5 cm or less, or 70 N / 5 cm or less.

[0077] Growth rate The standard MD elongation of the laminated nonwoven fabric may be 10% or more and 45% or less. If the standard elongation is within this range, the knot will tend to be tight. The standard elongation may be 12% or more, 15% or more, or 18% or more. The standard elongation may be 42% or less, 40% or less, or 30% or less.

[0078] The MD elongation of the laminated nonwoven fabric when wet may be 30% or more and 70% or less. If the wet elongation is within this range, the knots tend to be tight. The wet elongation may be 35% or more, 38% or more, or 40% or more. The wet elongation may be 65% or less, 60% or less, or 55% or less.

[0079] Stress at 5% elongation The standard stress at 5% elongation in the MD direction of the laminated nonwoven fabric may be 10 N / 5 cm or more and 30 N / 5 cm or less. If the standard stress at 5% elongation is 10 N / 5 cm or more, the knots tend to become stiff. If the standard stress at 5% elongation is 30 N / 5 cm or less, the handleability can be further improved. The standard stress at 5% elongation may be 11 N / 5 cm or more, 12 N / 5 cm or more, or 13 N / 5 cm or more. The standard stress at 5% elongation may be 29 N / 5 cm or less, 25 N / 5 cm or less, or 20 N / 5 cm or less.

[0080] The stress at 5% elongation in the MD direction of the laminated nonwoven fabric when wet may be 2.5 N / 5cm or more and 10 N / 5cm or less. If the stress at 5% elongation when wet is 2.5 N / 5cm or more, knots tend to become stiff. If the stress at 5% elongation when wet is 10 N / 5cm or less, handleability may be further improved. The stress at 5% elongation when wet may be 2.7 N or more, 2.8 N / 5cm or more, or 2.9 N / 5cm or more. The stress at 5% elongation when wet may be 9.5 N / 5cm or less, 9.0 N / 5cm or less, 8.5 N / 5cm or less, or 7.0 N / 5cm or less.

[0081] The tensile strength, elongation, and stress at extension of the laminated nonwoven fabric are measured in accordance with JIS L 1913:2010 6.3 (Tensile strength and elongation (ISO method)). For the measurement, for example, a constant-speed tension tensile tester is used. The measurement is performed under the conditions of a grip distance of 20 cm and a pulling speed of 30 cm / min.

[0082] The wet laminated nonwoven fabric can be obtained by impregnating 100 parts by mass of the standard laminated nonwoven fabric with 250 parts by mass of distilled water.

[0083] The size of the band is not particularly limited and may be set appropriately depending on the application. The width of the band is, for example, 3 cm or more and 30 cm or less. The width of the band may be 3.5 cm or more, or 4.0 cm or more. The width of the band may be 28 cm or less, or 26 cm or less. The length of the band is not particularly limited and may be set appropriately taking into account the manufacturing method, etc.

[0084] The bands may be selvage portions of a nonwoven fabric roll. Selvage portions are formed at both ends of the nonwoven fabric roll in the CD direction. Selvage portions are offcuts cut off from the nonwoven fabric roll to achieve a specified roll width during the production of nonwoven fabric products. A nonwoven fabric product is a portion of the nonwoven fabric roll that meets a specified basis weight (or thickness). Selvage portions typically include a portion that has this specified basis weight (which may correspond to the first portion) and a portion that does not meet the specified basis weight (which may correspond to the second portion). Selvage portions are typically disposed of as industrial waste. Using selvage portions as a material for string-like products is an effective use of resources and contributes to the realization of a sustainable society.

[0085] The phrase "the strip is an edge" means that the strip may be a cut-off scrap material itself, or may be a scrap material that has been shaped into a predetermined shape.

[0086] Specific embodiments in which the band includes a first portion and a second portion are shown below, but the band used in the present disclosure is not limited to these.

[0087] Aspect 1-1 The band in this embodiment is an edge portion of a nonwoven fabric roll made of a single fiber layer. For example, the portion of the edge portion having a predetermined basis weight is the first portion, and the portion that does not meet the predetermined basis weight is the second portion.

[0088] The fibers constituting the fiber layer are as described above and are not particularly limited. The basis weight of the fiber layer is appropriately set in consideration of the desired basis weight W1 of the first portion and the basis weight W2 of the second portion.

[0089] Aspect 1-2 The band according to this embodiment is obtained from a nonwoven fabric raw material obtained by laminating two or more fiber layers. The portion consisting of two or more fiber layers is the first portion, and the portion including fewer fiber layers than the first portion is the second portion. The band may be an edge portion of the nonwoven fabric raw material.

[0090] The fibers constituting each fiber layer are as described above and are not particularly limited. The fibers constituting each fiber layer may be the same or different. Multiple fiber layers made of the same fibers may be treated as one layer.

[0091] At least one of the fibrous layers constituting the first portion may contain pulp, which may increase the strength and elongation stress of the band.

[0092] From the viewpoint of handling, the other fibrous layer may contain cellulose fibers other than pulp. The other fibrous layer may contain at least one type selected from the group consisting of cotton, rayon, and solvent-spun cellulose fibers (typically, lyocell).

[0093] The nonwoven fabric, obtained by laminating a fiber layer containing pulp with a fiber layer containing other cellulose fibers, is a band (string-like material) that not only has excellent twisting processability and ease of handling, but is also biodegradable, contributing to the realization of a sustainable society.

[0094] The fiber layer constituting the first portion may be a wet-laid nonwoven fabric. Wet-laid nonwoven fabrics are formed by a wet process. Because wet-laid nonwoven fabrics have a dense structure, they can further increase the strength and elongation stress of the band.

[0095] The other fibrous layer may be formed from a web produced by a dry-laid method. Typical dry-laid methods include a carded method and an air-laid method. The other fibrous layer may be formed from a web produced by a carded method. A web produced by a dry-laid carded method has a suitable thickness and flexibility.

[0096] The basis weight of each fiber layer is appropriately set in consideration of the desired basis weight W1 of the first portion and the basis weight W2 of the second portion.

[0097] Aspects 1-3 The band according to this embodiment is obtained from a nonwoven fabric raw material obtained by laminating a first fiber layer and a second fiber layer that do not contain pulp and an intermediate fiber layer that is located between these fiber layers and contains pulp. The first portion includes a laminate in which the first fiber layer, the intermediate fiber layer, and the second fiber layer are laminated in this order. The second portion includes at least one of the first fiber layer and the second fiber layer. The band may be an edge portion of the nonwoven fabric raw material.

[0098] The intermediate fiber layer containing pulp may be formed from a wet-laid nonwoven fabric. By sandwiching the intermediate fiber layer between the first and second fiber layers, handling is improved.

[0099] At least one of the first and second fibrous layers may comprise at least one selected from the group consisting of cotton, rayon, and solvent-spun cellulose fibers (typically lyocell).

[0100] The fibers constituting the first and second fibrous layers may be the same or different, and a second portion including both the first and second fibrous layers made of the same fibers may be considered a single fibrous layer.

[0101] The basis weight of each fiber layer is appropriately set in consideration of the desired basis weight W1 of the first portion and the basis weight W2 of the second portion.

[0102] "The fiber layer does not contain pulp" means that the web used to form the fiber layer does not contain pulp. For example, in a laminate, even if some of the pulp constituting the intermediate fiber layer is mixed into the first and second fiber layers, the mixed pulp is not included in the first and second fiber layers.

[0103] "The web does not contain pulp" means that the mass ratio of pulp to the mass of the fibers constituting the web is less than 5 mass %.

[0104] The phrase "the fiber layer contains pulp" means that the mass ratio of pulp to the mass of the fibers constituting the fiber layer is 5% by mass or more. The above-mentioned mass ratio of pulp may be 50% by mass or more, 80% by mass or more, or 100% by mass.

[0105] Aspects 1-4 The band according to this embodiment is made of a single fiber layer, and edge processing is performed to move the open end of the fiber layer in the CD direction toward the center. The center of the fiber layer has a basis weight corresponding to the second portion, and the open end that has been processed as described above is the first portion having a larger basis weight.

[0106] The band according to this embodiment comprises a first portion and a second portion adjacent to the first portion, and the boundary between the first portion and the second portion is nonlinear. The first portion has a portion that is continuous in the MD direction and a portion that is discontinuous in the MD direction. In other words, the band according to this embodiment comprises an area in the MD where the first portion and the second portion coexist.

[0107] The fibers constituting the fiber layer are, for example, the same as those in embodiment 1-1.

[0108] Specific examples where the band includes a first portion and a second portion, and the first portion includes portions 1a and 1b, are shown below. However, the bands used in the present disclosure are not limited to these.

[0109] Aspect 2-1 The band in this embodiment is an edge portion of a nonwoven fabric roll, which is made of a single fiber layer and has undergone edge processing to move the open end of the fiber layer in the CD direction toward the center. The portion having a predetermined basis weight is portion 1a, the portion that does not meet the predetermined basis weight is portion 2, and the open end that has undergone the above processing is portion 1b.

[0110] The portion 1a is located at one end of the band in the width direction, the portion 1b is located at the other end of the band in the width direction, and the second portion is located therebetween.

[0111] The boundary between the portion 1b and the portion 2 is nonlinear. The portion 1b has a portion that is continuous in the MD direction and a portion that is discontinuous in the MD direction. In other words, the band according to this embodiment has an area in the MD where the portion 1b and the portion 2 are mixed.

[0112] The configuration of the single fiber layer is, for example, the same as in embodiment 1-1.

[0113] Aspect 2-2 The band according to this embodiment is an edge portion of a nonwoven fabric obtained by laminating two or more fiber layers and having undergone the edge treatment described above. For example, the portion consisting of two or more fiber layers is portion 1a, the portion including fewer fiber layers than portion 1 is portion 2, and the open end portion having undergone the edge treatment described above is portion 1b.

[0114] The portion 1a is located at one end of the band in the width direction, the portion 1b is located at the other end of the band in the width direction, and the portion 2 is located therebetween. As in embodiment 2-1, the boundary between the portion 1b and the portion 2 is non-linear, and the portion 1b has a portion that is continuous in the MD direction and a portion that is discontinuous in the MD direction.

[0115] The configuration of the two or more fiber layers is, for example, the same as in embodiment 1-2.

[0116] Aspects 2-3 The band according to this embodiment is an edge portion of a nonwoven fabric obtained by laminating a first fiber layer and a second fiber layer that do not contain pulp and an intermediate fiber layer that is located between these fiber layers and contains pulp, and which has been subjected to the above-mentioned edge treatment. For example, the portion including the first fiber layer, the intermediate fiber layer, and the second fiber layer is portion 1a, the portion including at least one of the first fiber layer and the second fiber layer but not the intermediate fiber layer is portion 2, and the open end that has been subjected to the above-mentioned edge treatment is portion 1b.

[0117] The portion 1a is located at one end of the band in the width direction, the portion 1b is located at the other end of the band in the width direction, and the portion 2 is located therebetween. As in embodiment 2-1, the boundary between the portion 1b and the portion 2 is non-linear, and the portion 1b has a portion that is continuous in the MD direction and a portion that is discontinuous in the MD direction.

[0118] The configurations of the first, second and intermediate fiber layers are the same as, for example, embodiment 1-3.

[0119] (string-like substance) The string-like material is obtained by twisting the strip so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material.

[0120] Tensile strength The tensile strength of the string-like material in the MD direction at the standard time may be 55 N or more and 100 N or less. If the tensile strength at the standard time is 55 N or more, the knot tends to become tight. If the tensile strength at the standard time is 100 N or less, the handleability may be further improved. The tensile strength at the standard time may be 57 N or more, 60 N or more, 62 N or more, or 70 N or more. The tensile strength at the standard time may be 95 N or less, 93 N or less, or 91 N or less.

[0121] The tensile strength in the MD direction of the string-like material when wet may be 35N or more and 75N or less. If the tensile strength when wet is 35N or more, the knot will tend to be tight. If the tensile strength when wet is 75N or less, the handleability may be further improved. The tensile strength when wet may be 38N or more, 42N or more, or 45N or more. The tensile strength when wet may be 73N or less, 70N or less, or 65N or less.

[0122] Growth rate The standard elongation percentage in the MD direction of the string-like material may be 6.5% or more and 15% or less. If the standard elongation percentage is within this range, the knot tends to become tight. The standard elongation percentage may be 6.7% or more, 6.8% or more, or 7.0% or more. The standard elongation percentage may be 13% or less, 11% or less, or 9% or less.

[0123] The MD elongation of the string-like material when wet may be 25% or more and 45% or less. If the wet elongation is within this range, the knot will tend to be tight. The wet elongation may be 26% or more, 27% or more, or 29% or more. The wet elongation may be 42% or less, 40% or less, or 38% or less.

[0124] Stress at 5% elongation The standard stress at 5% elongation in the MD direction of the string-like material may be 25 N or more and 75 N or less. If the standard stress at 5% elongation is 25 N or more, the knot will tend to become tight. If the standard stress at 5% elongation is 75 N or less, handleability can be further improved. The standard stress at 5% elongation may be 27 N or more, 30 N or more, or 35 N or more. The standard stress at 5% elongation may be 73.5 N or less, 72 N or less, or 70 N or less.

[0125] The stress at 5% elongation in the MD direction of the string-like material when wet may be 1.5 N or more and 11 N or less. If the stress at 5% elongation when wet is 1.5 N or more, the knot will tend to become tight. If the stress at 5% elongation when wet is 11 N or less, the handleability can be further improved. The stress at 5% elongation when wet may be 1.7 N or more, 1.8 N or more, or 2.2 N or more. The stress at 5% elongation when wet may be 10 N or less, 9 N or less, 8 N or less, or 6 N or less.

[0126] The tensile strength, elongation, and stress at extension of the string-like material are measured in accordance with JIS L 1095:2010 9.5 (Tensile strength and elongation (JIS method)). For the measurement, for example, a constant-speed tension-type tensile tester is used. The measurement is performed under the conditions of a grip distance of 20 cm and a pulling speed of 10 cm / min.

[0127] The wet string-like material can be obtained by impregnating 100 parts by mass of the standard string-like material with 250 parts by mass of distilled water.

[0128] A string-like material having a tensile strength in the MD direction of 55 N or more and 100 N or less under standard conditions, an elongation percentage of 6.5% or more and 15% or less, and a stress at 5% elongation of 25 N or more and 75 N or less is likely to maintain its twisted shape under standard conditions (dry state) and has excellent handleability.

[0129] A string-like material having a tensile strength in the MD direction of 35N or more and 75N or less when wet, an elongation percentage of 25% or more and 45% or less, and a stress at 5% elongation of 1.5N or more and 11N or less is likely to maintain its twisted shape even when wet (in a wet state), and has excellent handleability.

[0130] Fig. 1 is a top view schematically showing an example of a strip. The strip 10A includes a first portion 11 and a second portion 12. The first portion 11 and the second portion 12 are aligned in the CD direction and extend along the MD direction. Fig. 2 is a top view schematically showing how a string-like material is produced from the strip 10A. The strip 10A is twisted to produce a string-like material 20A.

[0131] Fig. 3 is a top view schematically showing another example of a band. Band 10B includes a 1a portion 11a, a second portion 12, and a 1b portion 11b. The 1a portion 11a, the second portion 12, and the 1b portion 11b are arranged in this order in the CD direction and extend along the MD direction. Fig. 4 is a top view schematically showing how a string-like material is produced from band 10B. Band 10B is twisted to produce a string-like material 20B.

[0132] The drawings are schematic and may not reflect actual dimensions or proportions. For convenience, different hatching is used for each part in Figures 1 to 4.

[0133] (Method of manufacturing string-like material) The string-like material is manufactured by a method comprising obtaining a strip-like nonwoven fabric including a first portion and a second portion from a nonwoven fabric raw roll having a plurality of portions with different basis weights aligned in a direction intersecting the longitudinal direction of the string-like material and extending along the longitudinal direction, and twisting the strip-like nonwoven fabric so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material.

[0134] (1) Preparation of nonwoven fabric roll First, a fiber web is prepared. Multiple fiber webs may be prepared as needed. The types and lengths of the fibers contained in the web are as described above.

[0135] As described above, the fiber web may be a precursor of a nonwoven fabric produced by a carded method, an airlaid method, a wetlaid method, etc., or may be a nonwoven fabric produced by a spunlace method, a spunbond method, a wetlaid method, etc. Each fiber web may be any selected from, for example, carded webs such as parallel webs, cross webs, semi-random webs, and random webs, airlaid webs, and wetlaid paper webs.

[0136] Next, the fiber web (or a laminated fiber web formed by laminating multiple fiber webs; the same applies below) is subjected to an entanglement treatment, for example, using a high-pressure fluid flow, to entangle the fibers. This results in a nonwoven fabric roll. By the entanglement treatment of the laminated fiber web, the multiple fiber webs are integrated by entanglement of the fibers.

[0137] The high-pressure fluid may be, for example, a high-pressure gas such as compressed air or a high-pressure liquid such as high-pressure water. The high-pressure fluid may be high-pressure water. High-pressure water (hereinafter also referred to as "water flow") suppresses excessive entanglement while facilitating entanglement of the fibers, thereby enhancing the sense of unity.

[0138] The hydroentanglement treatment is carried out by placing a fiber web on a support and spraying a columnar water stream onto the support. The support is, for example, a plain weave of 80 mesh or more and 100 mesh or less. The water stream is sprayed from a nozzle having orifices with a hole diameter of 0.05 mm or more and 0.5 mm or less, spaced at intervals of 0.3 mm or more and 1.5 mm or less. The water pressure is, for example, 1 MPa or more and 15 MPa or less. The water pressure may be 10 MPa or less, or may be 7 MPa or less. The water stream is sprayed 1 to 5 times on each of the front and back surfaces of the fiber web.

[0139] After the hydroentanglement treatment, the obtained raw nonwoven fabric is dried to remove moisture. The drying temperature is, for example, 100 to 160°C, and may be 120 to 150°C.

[0140] Edge treatment may be performed before the entanglement treatment. In the edge treatment, the open ends of the fibrous web are moved toward the center. The edge treatment increases the basis weight of the open end side of the fibrous web. The edge treatment can form portions of different basis weight in the fibrous web. The edge treatment forms a portion corresponding to the first portion (see embodiment 1-4) or a portion corresponding to the 1b portion (see embodiments 2-1 to 2-3) in the fibrous web. The edge treatment is performed, for example, by blowing air toward the center at the open ends of the fibrous web. The temperature and speed of the air are not particularly limited.

[0141] When edge processing is performed, the boundary line between adjacent portions with different basis weights (for example, the boundary line between the 1b portion and the 1a portion or the 2nd portion adjacent to the 1b portion) tends to become non-linear.

[0142] (2) Obtaining a belt The raw nonwoven fabric is cut into strips (typically rectangular shapes whose length is longer than their width). The raw nonwoven fabric may be cut into a main body and scraps, and the scraps (edge ​​portions) may be used as the desired strips.

[0143] When the nonwoven fabric is formed from a laminated fibrous web, the first portion may be formed by a laminate including multiple fibrous layers, and the second portion may include fewer fibrous layers than the first portion.

[0144] (3) Twisting The strips are twisted so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material to obtain a string-like material.

[0145] The device for twisting the ribbon is not particularly limited. For example, a roving frame is used for twisting. The number of twists is not particularly limited. The number of twists (number of twists (T) / m) is, for example, 5 T / m or more and 500 T / m or less. The number of twists may be 7 T / m or more, or 10 T / m or more. The number of twists may be 450 T / m or less, or 400 T / m or less.

[0146] A string may be formed by twisting a band and then twisting several of the resulting strings together to form a string-like product. Alternatively, a string-like product may be obtained by bundling several bands together and then twisting them.

[0147] A specific example of a process for preparing a raw nonwoven fabric that will be used as a material for the band according to Aspect 2-3 is shown below. The method for producing the raw nonwoven fabric used in the present disclosure is not limited to this example.

[0148] (i) Preparation of the fibrous web A first fibrous web and a second fibrous web containing no pulp, and an intermediate fibrous web containing pulp are prepared.

[0149] A first fiber web, an intermediate fiber web, and a second fiber web are laminated in this order, with the intermediate fiber web positioned so as not to overlap the open ends of the first fiber web and the second fiber web, but to overlap a portion of the center of the first fiber web and the second fiber web.

[0150] The open end of the laminated fibrous webs includes a first fibrous web and a second fibrous web. The open end corresponds to the second portion. The central portion includes the first fibrous web, an intermediate fibrous web, and a second fibrous web. The central portion corresponds to the 1a portion.

[0151] (ii) Edge processing The open end portion of the first and second fiber webs is exposed to air directed toward the center, causing the open end portion to move toward the center. This increases the thickness of a portion of the open end portion, forming a portion with a basis weight greater than that of the open end portion before the edge treatment. The portion formed by the edge treatment corresponds to portion 1b.

[0152] (iii) Confounding treatment After the edge treatment, the fiber web is subjected to an entanglement treatment to entangle the fibers, thereby obtaining a raw nonwoven fabric having the portion 1a, the portion 1b, and the second portion.

[0153] Figures 5A to 5C show a part of a method for manufacturing a string-like material. Figure 5A is a perspective view showing an example of a nonwoven fabric raw roll in a developed state. Figure 5B is a perspective view showing the state of edge treatment. Figure 5C is a perspective view showing the state of cutting the nonwoven fabric raw roll.

[0154] 5A includes a first fiber web 31, a second fiber web 32, and an intermediate fiber web 33 located therebetween. The intermediate fiber web 33 is disposed at a position that does not overlap the open ends 31b, 32b of the first fiber web 31 and the second fiber web 32, but overlaps part of the central portions 31a, 32a of the first fiber web 31 and the second fiber web 32.

[0155] 5B, the laminated fiber web 30 has open end portions 30b made up of the first fiber web 31 and the second fiber web 32, and a central portion 30a made up of the first fiber web 31, the intermediate fiber web 33, and the second fiber web 32. Air is blown toward the central portion 30a onto the open end portions 30b of the laminated fiber web 30, causing a portion of the open end portions 30b to move toward the central portion 30a.

[0156] After the edge treatment, an entanglement treatment is performed to obtain the raw nonwoven fabric 40 shown in Fig. 5C. The raw nonwoven fabric 40 is cut to separate the selvage portions 40b and the main body 40a. The band 10B (see Fig. 3) is obtained from the selvage portions 40b.

[0157] (Application) String-like materials are used for various purposes. In particular, the string-like material of the present disclosure is suitable for agricultural bait strings and packing strings. Bait strings are used to tie the vines and stems of agricultural products to supports. Packing strings are used to bundle household materials (typically newspapers and cardboard).

[0158] Conventionally, strings made of polypropylene or hemp are known. These are usually made of fibers of the same length. Therefore, hemp strings are excessively stiff. Hemp strings are difficult to tie tightly and are prone to injuring hands. Polypropylene strings are prone to injuring hands.

[0159] The string-like material of the present disclosure is formed from a nonwoven fabric having multiple portions with different basis weights, and therefore has excellent twisting processability and handleability. Agricultural attracting strings using the string-like material of the present disclosure can firmly secure agricultural produce to supports while preventing damage to the produce. Packaging strings using the string-like material of the present disclosure tightly bundle household goods and prevent the load from falling apart. [Example]

[0160] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto. The following fibers were prepared for use in this example.

[0161] Pulp: Fineness approximately 1.0-4.0 dtex, fiber length approximately 1-5 mm, wood-derived, basis weight 26 g / m 2 Wet nonwoven fabric, manufactured by Habix Co., Ltd. Cotton: Fineness 1.0 dtex to 5.0 dtex, fiber length 10 mm to 60 mm, average fiber length 20 mm, cotton fiber, product name: MSD, manufactured by Marusan Sangyo Co., Ltd. Lyocell: Fineness 1.7 dtex, average fiber length 38 mm, solvent-spun cellulose fiber, product name: Lyocell, manufactured by Lenzing Rayon: Fineness 1.7 dtex, average fiber length 40 mm, viscose rayon, product name: CD, manufactured by Daiwabo Rayon Co., Ltd.

[0162] [Example 1] (i) Preparation of intermediate fiber web Weight 26g / m 2 The intermediate fiber web was a wet-laid nonwoven fabric made of pulp.

[0163] (ii) Preparation of the first and second fiber webs The first and second fiber webs (both with a basis weight of approximately 16 g / m) were made from cotton using a parallel carding machine. 2 ) was produced.

[0164] (iii) Preparation of nonwoven fabric roll A laminated fiber web was produced by laminating the first fiber web, the intermediate fiber web, and the second fiber web in this order. The mass ratio of the intermediate fiber web to the sum of the first and second fiber webs (intermediate / first, second) was 45% by mass / 55% by mass.

[0165] The edge treatment was carried out by blowing air from the end of the laminated fiber web in the width direction toward the center of the laminated fiber web.

[0166] Next, the laminated fiber web was placed on a support (90 mesh plain weave) and transported at a speed of 4 m / min, while a water stream at a water pressure of 3.0 MPa was sprayed once onto the surface of the second fiber web. Subsequently, a water stream at a water pressure of 3.0 MPa was sprayed once onto the surface of the third fiber web. In this hydroentanglement treatment, a nozzle with orifices having a hole diameter of 0.12 mm and spaced 0.6 mm apart was used. The distance between the nozzle and the laminated fiber web was 20 mm. Finally, a drying treatment was carried out at 100°C to obtain a dried nonwoven fabric raw material A (basis weight 45 g / m 2 ) was obtained.

[0167] (iv) Cutting The nonwoven fabric was cut to obtain a strip measuring 5 cm in length in the CD direction from the selvage and 25 cm in length in the MD direction. The strip had the configuration shown in Figure 3 and included a portion 1a, a second portion, and a portion 1b. The portion 1a 11a, the second portion 12, and the portion 1b 11b were arranged in this order in the CD direction and extended along the MD direction. The portion 1a had a basis weight of 59.7 g / m 2 The width of the first part was 2.5 cm. The weight of the first part was 48.9 g / m 2 The second part had a basis weight of 40.7 g / m 2 , and was 1.0 cm wide.

[0168] (v) Twisting The strip was twisted using a roving frame (twist number 18 T / m) so that the MD direction of the nonwoven fabric was the longitudinal direction of the string-like material, thereby obtaining a string-like material.

[0169] [Comparative Example 1] A cotton fiber web was prepared from cotton using a parallel carding machine, and was subjected to hydroentanglement treatment and drying in the same manner as in Example 1 to obtain a cotton nonwoven fabric (basis weight 60 g / m 2 ) was obtained. A string-like material was obtained from the cotton nonwoven fabric in the same manner as in Example 1.

[0170] [Comparative Examples 2 to 4] We prepared commercially available polypropylene packing string (manufactured by Yutaka Make Co., Ltd., product name: PS Rope, product number M-576), commercially available paper string (manufactured by Yutaka Make Co., Ltd., product name: Kamihimo, product number M-153-1), and commercially available hemp string (manufactured by BMS, product name: Asanohimo Jute White).

[0171] [evaluation] The evaluation methods are as follows. The evaluation results are shown in Tables 1 and 2. Table 1 shows the physical properties of the nonwoven fabric, and Table 2 shows the physical properties of the string-like material. For the evaluation, dry and wet nonwoven fabrics and strings were used as samples. The wet samples were obtained by impregnating 100 parts by mass of dry nonwoven fabric or strings with 250 parts by mass of distilled water.

[0172] (Strength, tensile strength, and elongation rate of laminated nonwoven fabric) In accordance with JIS L 1913:2010 6.3 (Tensile strength and elongation (ISO method)), a constant-speed tension tensile tester was used to perform tensile tests on 50 mm wide x 250 mm long specimens at a grip distance of 20 cm and a tensile speed of 30 cm / min. The load value (tensile strength), elongation, and stress at 5% elongation at which the specimen broke were measured. Three specimens per test level were prepared, and the measured values ​​were averaged. In the tensile test, the machine direction (MD) of the specimen was defined as the tensile direction.

[0173] (Stretching stress, tensile strength, and elongation of string-like objects) In accordance with JIS L 1095:2010 9.5 (Single yarn tensile strength and elongation (JIS method)), a tensile test was conducted using a constant-speed tension-type tensile tester with a grip distance of 20 cm and a tensile speed of 10 cm / min. The load value (tensile strength) and elongation at which the sample broke, as well as the stress at 5% elongation, were measured. Three samples were prepared per test level, and the measured values ​​were averaged. In the tensile test, the machine direction (MD) of the sample was defined as the tensile direction.

[0174] (Twist processability) The string-like material was tied to the object, and the tied state was visually confirmed to judge the twisting processability. Specifically, the outer circumference of the object (a paper tube with a diameter of 8.6 cm and a length of 30 cm) was tied with a string-like material (60 cm long) in a stop knot, and then a bow knot was tied, and the twisting state and the knot state of the string-like material were visually confirmed after one hour.

[0175] (Evaluation criteria) Good: After 1 hour, the twist shape is maintained and the knot is not loose. Poor: After 1 hour, the twist has come undone or the knot has loosened.

[0176] [Table 1]

[0177] [Table 2]

[0178] The present disclosure includes the following aspects. (Aspect 1) A string-like object formed by twisting strip-shaped nonwoven fabric, The strip-shaped nonwoven fabric has a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction, The plurality of portions includes a first portion and a second portion having a basis weight smaller than that of the first portion. (Aspect 2) the first portion includes two or more fiber layers; The strand of embodiment 1, wherein the second portion includes fewer fiber layers than the first portion. (Aspect 3) 3. The strand of claim 1 or 2, wherein the first portion comprises pulp. (Aspect 4) The string-like object according to any one of Aspects 1 to 3, wherein the boundary between the first portion and the second portion adjacent to the first portion is a straight line. (Aspect 5) The string-like object according to any one of Aspects 1 to 3, wherein the boundary between the first portion and the second portion adjacent to the first portion is non-linear. (Aspect 6) The difference between the basis weight of the first portion and the basis weight of the second portion is 3.0 g / m 2 The string-like material according to any one of aspects 1 to 3 is as described above. (Aspect 7) The string-like material of embodiment 1, wherein the first portion includes a portion 1a and a portion 1b having a basis weight smaller than that of the portion 1a and larger than that of the second portion. (Aspect 8) The string of embodiment 7, wherein the second portion is located between the 1a portion and the 1b portion. (Aspect 9) The portion 1a is located at one end of the strip-shaped nonwoven fabric in a direction intersecting the longitudinal direction, The string-like material according to aspect 7 or 8, wherein the portion 1b is located at the other end of the strip-shaped nonwoven fabric in a direction intersecting the longitudinal direction. (Aspect 10) The string-like material according to any one of Aspects 7 to 9, wherein the boundary line between the portion 1b and the portion 1a or the portion 2 adjacent to the portion 1b is a straight line. (Aspect 11) The string-like material of any one of Aspects 7 to 9, wherein the boundary line between the portion 1b and the portion 1a or the portion 2 adjacent to the portion 1b is non-linear. (Aspect 12) The 1a portion includes a laminate of a fiber layer that does not contain pulp and a fiber layer that contains pulp, The string-like material of any one of Aspects 7 to 11, wherein the portion 1b and the second portion include a fiber layer that does not contain the pulp, and do not include a fiber layer that contains the pulp. (Aspect 13) The string-like material according to any one of Aspects 1 to 12, wherein the strip-shaped nonwoven fabric is an edge portion of a raw nonwoven fabric. (Aspect 14) The string-like material according to any one of Aspects 1 to 13, wherein the strip-like nonwoven fabric is a part of a raw roll of hydroentangled nonwoven fabric. (Aspect 15) An agricultural attractant cord using the cord-like material of any one of embodiments 1 to 14. (Aspect 16) A packaging string using the string-like material of any one of Embodiments 1 to 14. (Aspect 17) A method for producing a string-like object, Obtaining a strip-shaped nonwoven fabric including a first portion and a second portion having a basis weight smaller than that of the first portion from a raw nonwoven fabric having a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction; and twisting the strip-shaped nonwoven fabric so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material. (Aspect 18) The nonwoven fabric raw material is the first portion formed by a laminate including a plurality of fiber layers; The method for producing the string-like material of embodiment 17, further comprising: the second portion including a fewer number of fiber layers than the first portion. (Aspect 19) The nonwoven fabric raw material is providing a fibrous web having open ends and a central portion corresponding to the second portion; a portion of the open end portion is moved toward a central portion to increase the basis weight of the portion of the open end portion, and the portion of the open end portion is processed into a portion corresponding to the first portion; 19. The method for producing a string-like material according to aspect 17 or 18, wherein the string-like material is obtained by a method comprising: subjecting the fiber web to an entanglement treatment after the processing to entangle the fibers with each other. (Aspect 20) In the strip-shaped nonwoven fabric, the first portion includes a portion 1a and a portion 1b having a basis weight smaller than that of the portion 1a and larger than that of the second portion, The nonwoven fabric raw material is providing a fibrous web having a central portion corresponding to the 1a portion and an open end portion corresponding to the second portion; a part of the open end portion is moved toward a central portion to increase the basis weight of the part of the open end portion, and a part of the part corresponding to the second portion is processed into a part corresponding to the 1b portion; A method for producing a string-like material according to aspect 17, wherein the string-like material is obtained by a method comprising: subjecting the fiber web to an entanglement treatment after the processing to entangle the fibers with each other. (Aspect 21) Aspect 21. The method for producing a string-like material according to aspect 19 or 20, wherein the processing is performed by moving a part of the open end toward a center by air blowing. (Aspect 22) 22. The method for producing a string-like material according to any one of Aspects 17 to 21, wherein the strip-shaped nonwoven fabric is obtained from an edge portion of the raw nonwoven fabric. (Aspect 23) 23. The method for producing a string-shaped material according to any one of Aspects 17 to 22, wherein at least one of the plurality of fiber layers forming the first portion contains pulp. [Industrial Applicability]

[0179] The strings of the present disclosure have excellent twisting processability and handling properties, and are therefore useful as agricultural bait strings and baling strings. [Explanation of symbols]

[0180] 10A, 10B Strip-shaped nonwoven fabric (strip) 11 Part 1 11a Part 1a 11b Part 1b 12 Part 2 20A, 20B String-like object 30 Laminated Fiber Web 30a central part 30b open end 31 First Fiber Web 31a central part 31b Open end 32 Second fiber web 32a central part 32b open end 33 Intermediate fiber web 40 Nonwoven fabric rolls 40a body 40b Ears

Claims

1. A string-like object formed by twisting strip-shaped nonwoven fabric, The strip-shaped nonwoven fabric has a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction, The plurality of portions includes a first portion and a second portion having a basis weight smaller than that of the first portion.

2. the first portion includes two or more fiber layers; The strand of claim 1 , wherein the second portion includes fewer fiber layers than the first portion.

3. The strand of claim 1 , wherein the first portion comprises pulp.

4. The string-like object according to claim 1 , wherein a boundary line between the first portion and the second portion adjacent to the first portion is a straight line.

5. The string-like object according to claim 1 , wherein a boundary line between the first portion and the second portion adjacent to the first portion is non-linear.

6. The difference between the basis weight of the first portion and the basis weight of the second portion is 3.0 g / m ２ The string-like material according to claim 1 .

7. The string-like material according to claim 1 , wherein the first portion includes a portion 1a and a portion 1b having a basis weight smaller than that of the portion 1a and larger than that of the second portion.

8. The string according to claim 7 , wherein the second portion is located between the first portion a and the first portion b.

9. The 1a portion is located at one end of the strip-shaped nonwoven fabric in a direction intersecting the longitudinal direction, The string-like object according to claim 7 , wherein the first b portion is located at the other end of the strip-shaped nonwoven fabric in a direction intersecting the longitudinal direction.

10. The string-like object according to claim 7 , wherein a boundary line between the first b portion and the first a portion or the second portion adjacent to the first b portion is a straight line.

11. The string-like object according to claim 7 , wherein a boundary line between the first b portion and the first a portion or the second portion adjacent to the first b portion is non-linear.

12. The 1a portion includes a laminate of a fiber layer that does not contain pulp and a fiber layer that contains pulp, The string-like object according to claim 7 , wherein the first portion and the second portion include a fiber layer that does not contain the pulp and do not include a fiber layer that contains the pulp.

13. The string-like object according to claim 1 , wherein the strip-shaped nonwoven fabric is an edge portion of a raw nonwoven fabric.

14. The string-like material according to claim 1 , wherein the strip-shaped nonwoven fabric is a part of a raw roll of hydroentangled nonwoven fabric.

15. An agricultural attractant cord using the cord-like material according to claim 1.

16. A packaging string using the string-like material according to claim 1.

17. A method for producing a string-like object, Obtaining a strip-shaped nonwoven fabric including a first portion and a second portion having a basis weight smaller than that of the first portion from a raw nonwoven fabric having a plurality of portions with different basis weights that are aligned in a direction intersecting the longitudinal direction of the string-like material and extend along the longitudinal direction; and twisting the strip-shaped nonwoven fabric so that the MD direction of the nonwoven fabric is the longitudinal direction of the string-like material.

18. The nonwoven fabric raw material is the first portion formed by a laminate including a plurality of fiber layers; The method for manufacturing a string-shaped material according to claim 17, further comprising: the second portion including a fewer number of fiber layers than the first portion.

19. The nonwoven fabric raw material is providing a fibrous web having open ends and a central portion corresponding to the second portion; a part of the open end portion is moved toward a central portion to increase the basis weight of the part of the open end portion, and the part of the open end portion is processed into a part corresponding to the first part; The method for producing a string-like material according to claim 17, wherein the string-like material is obtained by a method comprising: subjecting the fiber web to an entanglement treatment after the processing to entangle the fibers with each other.

20. In the strip-shaped nonwoven fabric, the first portion includes a portion 1a and a portion 1b having a basis weight smaller than that of the portion 1a and larger than that of the second portion, The nonwoven fabric raw material is providing a fibrous web having a central portion corresponding to the 1a portion and an open end portion corresponding to the second portion; a part of the open end portion is moved toward a central portion to increase the basis weight of the part of the open end portion, and a part of the part corresponding to the second portion is processed into a part corresponding to the 1b portion; The method for producing a string-like material according to claim 17, wherein the string-like material is obtained by a method comprising: subjecting the fiber web to an entanglement treatment after the processing to entangle the fibers with each other.

21. The method for producing a string-like material according to claim 19 or 20, wherein the processing is performed by moving a part of the open end toward the center with an air blow.

22. The method for producing a string-like material according to claim 17, wherein the strip-shaped nonwoven fabric is obtained from an edge portion of the raw nonwoven fabric.

23. The method for manufacturing a string-like material according to claim 17 , wherein at least one of the plurality of fiber layers forming the first portion includes pulp.

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