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

Abstract

To provide a string-like material having excellent operability and handleability, and also to provide a manufacturing method thereof.SOLUTION: A string-like material is formed by twisting a belt-like laminated nonwoven fabric. A first fiber layer, which is constituted of first fibers, and a second fiber layer, which is constituted of second fibers having average fiber length longer than average fiber length of the first fibers by 10 mm or more, are integrated by entanglement between fibers in the laminated nonwoven fabric. The laminated nonwoven fabric is twisted so that MD direction of the laminated nonwoven fabric becomes a longitudinal direction of the string-like material.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 to obtain string-like materials. [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] The maneuverability and handling of the string-like material leave room for improvement. An object of the present disclosure is to provide a string-like material obtained from a nonwoven fabric and having excellent maneuverability and handling properties. [Means for solving the problem]

[0005] The present disclosure provides: A string-like object formed by twisting strip-shaped laminated nonwoven fabrics, In the laminated nonwoven fabric, a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length that is 10 mm or more longer than the average fiber length of the first fibers, the first fiber layer and the second fiber layer being integrated by entanglement of the fibers; The string-like material is provided by twisting the laminated nonwoven fabric so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material.

[0006] The present disclosure also provides A method for producing a string-like object, preparing a laminated nonwoven fabric in which a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length 10 mm or more longer than the average fiber length of the first fibers are integrated by entanglement of the fibers; Cutting the laminated nonwoven fabric into strips; and twisting the strip-shaped laminated nonwoven fabric so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material. [Effects of the Invention]

[0007] According to the present disclosure, a string-like object having excellent operability and handling properties is provided. DETAILED DESCRIPTION OF THE INVENTION

[0008] The string-like material of the present disclosure is formed by twisting strip-shaped laminated nonwoven fabrics. The laminated nonwoven fabric comprises a first fiber layer and a second fiber layer. The first fiber layer and the second fiber layer are integrated by entanglement of the fibers. The first fiber layer is composed of first fibers. The second fiber layer is composed of second fibers having an average fiber length at least 10 mm longer than that of the first fibers.

[0009] The laminated nonwoven fabric has a plurality of fiber layers containing fibers with different average fiber lengths, which improves operability and handling.

[0010] The operability of a string-like object specifically refers to the overall performance of its ability to follow the object it is used on, the tightness of the knot, and how easily the knot loosens. High operability means that the string-like object can follow the object it is used on easily, a tight knot can be formed, and the knot is difficult to loosen. A string-like object with high operability can fix the object it is used on in a predetermined position.

[0011] The manipulability of the string-like material can be evaluated, for example, by its tensile strength, elongation, and stress at 5% elongation (5% modulus). The stress at 5% elongation is the force required to elongate the sample by 5%.

[0012] If the tensile strength is too low, the string will break easily. As a result, it will be unable to form a tight knot and will be unable to secure the object it is used to. The same is true if the elongation is too low. If the stress at 5% elongation is too high, the string-like material will lose its flexibility and will be less able to conform to the object it is used to. In addition, gaps will easily form in the knot, reducing its ability to bind tightly.

[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 string-like 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 string-shaped material may be used in an environment where it is exposed to rain, and the above-mentioned operability and handling properties are also required for the string-shaped material in a wet state.

[0016] The first fibers, which have a short average fiber length, are appropriately entangled with the second fibers, which have a longer average fiber length, during the fiber entanglement process, thereby increasing the strength of the laminated nonwoven fabric. The first fiber layer, which has short first fibers, is dense. The first fiber layer appropriately increases the strength of the laminated nonwoven fabric and controls the elongation stress within an appropriate range. The first fiber layer primarily improves operability.

[0017] The second fibers having a longer average fiber length enhance the texture of the laminated nonwoven fabric and improve its feel against the skin. The second fiber layer mainly improves the handling properties.

[0018] In the laminated nonwoven fabric, first fibers and second fibers having different average fiber lengths form different fiber layers, and these fiber layers are integrated. This laminated nonwoven fabric is twisted so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material. As a result, the obtained string-like material exhibits high operability and excellent handleability.

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

[0022] First, the fiber layer used in the present disclosure and the fibers that make up the fiber layer will be described. (First fiber layer) The first fiber layer is composed of a plurality of first fibers, each having an average fiber length that is at least 10 mm shorter than that of the second fibers.

[0023] The difference (L2-L1) between the average fiber length L1 of the first fibers and the average fiber length L2 of the second fibers may be 12 mm or more, 15 mm or more, 20 mm or more, or 23 mm or more. L2-L1 may be 80 mm or less, 75 mm or less, or 70 mm or less.

[0024] The average fiber length L1 is not particularly limited. From the viewpoint of improving operability, the average fiber length L1 may be 0.5 mm or more and 20 mm or less. The average fiber length L1 may be 15 mm or less, 12 mm or less, 10 mm or less, 8 mm or less, or 5 mm. The average fiber length L1 may be 1 mm or more, 1.5 mm or more, 2.0 mm or more, or 2.5 mm or more.

[0025] The average fiber length L can be determined as follows. First, the laminated nonwoven fabric is separated into each fiber layer. The portions of each fiber layer other than the end faces are separated to obtain 1.0 g of fiber. The fiber lengths of all of these fibers are measured and averaged to obtain the average fiber length L. Alternatively, the average fiber length L may be determined by measuring the fiber lengths of any multiple fibers whose entire lengths can be observed using a scanning electron microscope (SEM). The magnification of the SEM may be, for example, 300 to 500 times. When it is difficult to calculate the average fiber length L (for example, when a commercially available fiber layer (fiber web) is used and the length of the fibers used is shown as a range), the maximum fiber length (for example, the upper limit value when the fiber length is shown as a range, as described above) may be considered to be the average fiber length L.

[0026] The first fibers may have substantially the same average fiber length L1. This facilitates obtaining strength and elongation stress suitable for the string-like material. Specifically, the fiber lengths of 90% or more, preferably 95% or more of the first fibers may be within the range of the average fiber length L1 ±3 mm.

[0027] The type of the first fiber is not particularly limited. The first 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.

[0028] 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).

[0029] From the viewpoint of environmental conservation, the first fiber may include biodegradable fibers, such as cellulose fibers, natural fibers other than cellulose fibers (such as silk and wool), and biodegradable synthetic fibers.

[0030] 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.

[0031] Biodegradable synthetic fibers are fibers made of biodegradable thermoplastic resins. Examples of biodegradable thermoplastic resins include polylactic acid and polybutylene succinate. Biodegradable fibers made by adding a biodegradation promoter to synthetic fibers may also be used.

[0032] The first 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

[0033] The first fibers may contain pulp. The pulp is easily entangled with the second fibers when the laminated nonwoven fabric is produced by the hydroentangling method described below, thereby further increasing the strength and elongation stress of the laminated nonwoven fabric. The fiber length of the pulp is about 0.8 to 5.0 mm, and the average fiber length of the pulp is also within the range of 0.8 to 5.0 mm.

[0034] The first fibrous layer may be formed from 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 laminated nonwoven fabric.

[0035] The first fiber layer may be formed from a wetlaid nonwoven fabric containing pulp. Pulp has a flat fiber cross section, which makes it difficult for unevenness to form on the surface of a wetlaid nonwoven fabric containing pulp. Therefore, when laminated with the second fiber layer, the texture of the second fiber layer is unlikely to be affected.

[0036] The first fibers may contain pulp and one or more fibers with different average fiber lengths and / or fiber types. The first fibers may contain 50% by mass or more, 80% by mass or more, or even 100% by mass of pulp. The pulp percentage is the mass percentage of pulp in the first fibers (excluding, for example, the mass of binders, additives, etc. added during web production).

[0037] The fiber content is the percentage of fibers contained in the fiber layer (web) before lamination. For example, in a laminated nonwoven fabric, even if some of the fibers constituting the second fiber layer are mixed into the first fiber layer, the mixed fibers are not included in the first fiber layer.

[0038] The fineness of the first fibers is not particularly limited. The fineness of the first 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 first fibers may be 5.0 dtex or less, 4.0 dtex or less, or 3.0 dtex or less. The fineness of the pulp is approximately 1.0 dtex or more and 4.0 dtex or less.

[0039] The basis weight of the first fiber layer is not particularly limited. The basis weight of the first fiber layer is 10 g / m 2 may be 15 g / m or more, 2 may be 20 g / m or more, 2 The basis weight of the first fiber layer may be 70 g / m or more. 2 may be less than 50 g / m 2 may be less than or equal to 30 g / m 2 When the basis weight of the first fiber layer is within this range, the strength and stress at extension of the laminated nonwoven fabric can be controlled within appropriate ranges.

[0040] (Second fiber layer) The second fiber layer is composed of a plurality of second fibers, each having an average fiber length at least 10 mm longer than that of the first fibers.

[0041] The average fiber length L2 of the second fibers is not particularly limited. From the viewpoint of improving handleability, the average fiber length L2 may be 15 mm or more and 80 mm or less. The average fiber length L2 may be 18 mm or more, 20 mm or more, 25 mm or more, or 30 mm or more. The average fiber length L2 may be 70 mm or less, or 65 mm or less.

[0042] The second fibers may have substantially the same average fiber length L2. This facilitates obtaining flexibility suitable for the string-like material. Specifically, the fiber lengths of 90% or more, preferably 95% or more of the second fibers may be within the range of the average fiber length L2 ±3 mm.

[0043] The type of the second fiber is not particularly limited. The second 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.

[0044] From the viewpoint of environmental conservation, the second fiber may include the biodegradable fiber described above.

[0045] The second fibers may contain the above-mentioned cellulose fibers, which prevent excessive elongation of the string-like material. The cellulose fibers may contain a plurality of types of cellulose fibers with different average fiber lengths and / or different types.

[0046] The second fiber may comprise at least one selected from the group consisting of cotton, rayon, and solvent-spun cellulose fiber (typically, lyocell) from the viewpoints of skin feel and biodegradability. The cotton may comprise multiple types of cotton with different average fiber lengths and / or different types. The rayon may comprise multiple types of rayon with different average fiber lengths and / or different types. The solvent-spun cellulose fiber may comprise multiple types of solvent-spun cellulose fiber with different average fiber lengths and / or different types.

[0047] The second fibrous layer may be formed from a web produced by a dry-laid method. Typical dry-laid methods include carded and air-laid methods. The second fibrous layer may be formed from a web produced by a carded method. Webs produced by a dry-laid carded method have appropriate thickness and flexibility.

[0048] The fineness of the second fibers is not particularly limited. The fineness of the second fibers may be 0.3 dtex or more and 6.0 dtex or less. The fineness of the second fibers may be 0.6 dtex or more, 0.8 dtex or more, or 1.0 dtex or more. The fineness of the second fibers may be 5.0 dtex or less, 4.0 dtex or less, or 3.0 dtex or less.

[0049] The basis weight of the second fiber layer is not particularly limited. The basis weight of the second fiber layer is 10 g / m 2 may be 15 g / m or more, 2 may be 20 g / m or more, 2 The basis weight of the second fiber layer may be 70 g / m or more. 2 may be less than 50 g / m 2 may be less than or equal to 30 g / m 2 A laminated nonwoven fabric having a basis weight of the second fiber layer in this range has a good feel.

[0050] (Laminated nonwoven fabric) The laminated nonwoven fabric includes at least a first fiber layer and a second fiber layer. In the laminated nonwoven fabric, the fiber layers are stacked and integrated at least by entanglement of the fibers. In the laminated nonwoven fabric, it is sufficient that at least a portion of each fiber layer overlaps. That is, the laminated nonwoven fabric may have an area that contains only the first fiber layer or only the second fiber layer (and the third fiber layer, which will be described later).

[0051] The mass ratio of the first fiber layer to the second fiber layer is not particularly limited, and may be 30 / 70 to 70 / 30, 35 / 65 to 65 / 35, or 40 / 60 to 60 / 40.

[0052] The laminated nonwoven fabric may comprise a first fibrous layer that is a wet-laid nonwoven fabric containing pulp, and a second fibrous layer that contains at least one fiber selected from the group consisting of cotton, rayon, and solvent-spun cellulose fibers and is produced by a dry carding method. Laminated nonwoven fabrics made primarily of cellulose fibers are biodegradable, in addition to being easy to handle and manipulate, and contribute to the realization of a sustainable society.

[0053] The laminated nonwoven fabric may include a first fiber layer, a second fiber layer, and a third fiber layer. The third fiber layer may be disposed on the side of the first fiber layer opposite the second fiber layer. The laminated nonwoven fabric may be formed by laminating the second fiber layer, the first fiber layer, and the third fiber layer in this order. The fiber type and average fiber length of the third fiber layer are not particularly limited. The third fiber layer may have the same fiber type and average fiber length as the second fiber layer. The laminated nonwoven fabric may include a first fiber layer that is a wet-laid nonwoven fabric containing pulp, and second and third fiber layers that contain at least one fiber selected from the group consisting of cotton, rayon, and solvent-spun cellulose fibers and are produced by a dry carding method.

[0054] The laminated nonwoven fabric may be produced by a hydroentanglement method, a spunbond method, or a needlepunch method. The laminated nonwoven fabric may be a hydroentangled nonwoven fabric produced by a hydroentanglement method.

[0055] The basis weight of the laminated nonwoven fabric is not particularly limited. The basis weight of the laminated nonwoven fabric is 10 g / m 2 may be 15 g / m or more, 2 may be 20 g / m or more, 2 may be 30 g / m or more, 2 The basis weight of the laminated nonwoven fabric may be 100 g / m or more. 2 may be less than 90 g / m 2 may be less than 80 g / m 2 may be less than 70 g / m 2 When the basis weight of the laminated nonwoven fabric is within this range, the operability and handling properties can be further improved.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] (string-like substance) The string-like material can be obtained by twisting the laminated nonwoven fabric cut into strips so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material. The laminated nonwoven fabric cut into strips may be twisted so that the second fiber layer is on the outside.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 rate 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 can be said to have excellent operability and handleability under standard conditions (dry state).

[0074] 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 can be said to have excellent operability and handleability even when wet (in a wet state).

[0075] (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).

[0076] 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.

[0077] The string-like material of the present disclosure is formed from a laminated nonwoven fabric having fiber layers containing fibers of different average fiber lengths, and therefore has high operability and excellent handleability. Agricultural attracting strings using the string-like material of the present disclosure can firmly secure agricultural produce to supports while minimizing damage to the produce. Packaging strings using the string-like material of the present disclosure can tightly bundle household goods and minimize collapse.

[0078] (Method of manufacturing string-like material) The string-like material is produced by a method comprising the steps of preparing a laminated nonwoven fabric in which a first fiber layer composed of first fibers and a second fiber layer composed of second fibers having an average fiber length that is 10 mm or more longer than the average fiber length of the first fibers are integrated by entanglement of the fibers, cutting the laminated nonwoven fabric into strips, and twisting the strip-shaped laminated nonwoven fabric so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material.

[0079] (1) Preparation of laminated nonwoven fabric First, a first fiber web, a second fiber web, and optionally a third fiber web are prepared. The first fiber web forms a first fiber layer. The second fiber web forms a second fiber layer. The third fiber web forms a third fiber layer.

[0080] As described above, each fiber web may be a precursor of a nonwoven fabric produced by a carded method, an airlaid method, a wetlaid method, or the like, and may be a nonwoven fabric produced by a spunlace method, a spunbond method, a wetlaid method, or the like. Each fiber web may be selected from, for example, carded webs such as parallel webs, cross webs, semi-random webs, and random webs, airlaid webs, and wetlaid paper webs. From the viewpoint of strength, the first fiber web may be produced by a wetlaid method. From the viewpoint of flexibility, the second and third fiber webs may be produced by a carded method or an airlaid method.

[0081] The types and average fiber lengths of the fibers contained in the first, second, and third fiber webs are as described above in relation to the first, second, and third fiber layers.

[0082] Next, the first fiber web and the second fiber web are laminated to produce a laminated fiber web. Alternatively, the second fiber web, the first fiber web, and the third fiber web are laminated in this order to produce a laminated fiber web. If necessary, a pre-laminate fiber web may be produced by laminating the second fiber web (or the third fiber web) and the first fiber web in advance, and then the third fiber web (or the second fiber web) may be laminated on this to produce a laminated fiber web. The pre-laminate fiber web may be one in which the fibers between the fiber webs have been previously integrated.

[0083] The laminated fiber webs are subjected to an entanglement treatment using, for example, a high-pressure fluid flow to entangle the fibers, thereby entangling the first fiber web and the second fiber web, or the second fiber web, the first fiber web, and the third fiber web, to form a laminated nonwoven fabric.

[0084] 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. The high-pressure water suppresses excessive entanglement of the second fibers while facilitating entanglement of the fibers in the fibrous web, thereby enhancing the sense of unity.

[0085] Hereinafter, the method for producing the laminated nonwoven fabric used in the present disclosure will be described using an example in which high-pressure water (hereinafter also referred to as "water flow") is used as the high-pressure fluid, but the present disclosure is not limited to this.

[0086] The hydroentanglement treatment is carried out by placing the laminated fiber web on a support and spraying a columnar water stream onto it. 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 onto each of the front and back surfaces of the laminated fiber web.

[0087] After the hydroentanglement treatment, the obtained laminated nonwoven fabric is dried to remove water. The drying temperature is, for example, 100 to 160°C, and may be 120 to 150°C.

[0088] (2) Cutting The laminated nonwoven fabric is cut into strips (typically rectangles whose length in the MD direction is greater than that in the CD direction). The laminated nonwoven fabric is desirably cut so that a portion in which the first fiber layer and the second fiber layer (and further the third fiber layer) are laminated exists over the entire length of the strip in the MD direction. The laminated nonwoven fabric may also be cut so that a portion in which the first fiber layer and the second fiber layer (and further the third fiber layer) are laminated exists over the entire length of the strip in the CD direction.

[0089] The size of the strip-shaped laminated nonwoven fabric (nonwoven fabric strip) is not particularly limited and may be set appropriately depending on the application. The length in the CD direction of the nonwoven fabric strip is, for example, 1 cm or more and 50 cm or less. The length in the CD direction may be 1.5 cm or more, or 2 cm or more. The length in the CD direction may be 45 cm or less, or 40 cm or less.

[0090] (3) Twisting The nonwoven fabric strips are twisted so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the strings, and the nonwoven fabric strips may be twisted so that the second fibrous layer is on the outside.

[0091] The device for twisting the nonwoven fabric band 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.

[0092] A string formed by twisting a nonwoven fabric band may be further twisted together to form a string-like product. A string-like product may also be obtained by twisting multiple nonwoven fabric bands. [Example]

[0093] 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.

[0094] Pulp: Fineness approximately 1.0-4.0 dtex, fiber length approximately 0.8 mm-4.5 mm (average fiber length 4.5 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.

[0095] [Example 1] (i) Preparation of the first fiber web Weight 26g / m 2 The wet-laid pulp nonwoven fabric was used as the first fiber web.

[0096] (ii) Preparation of the second and third fiber webs The cotton was then carded into second and third fiber webs (each with a basis weight of approximately 16 g / m) using a parallel carding machine. 2 ) was produced.

[0097] (iii) Preparation of laminated nonwoven fabric A laminated fiber web was produced by laminating the second fiber web, the first fiber web, and the third fiber web in this order. The mass ratio of the first fiber web to the sum of the second and third fiber webs (first / second+third) was 45% by mass / 55% by mass.

[0098] 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 laminated nonwoven fabric (basis weight 45 g / m 2 ) was obtained.

[0099] (iv) Cutting The laminated nonwoven fabric was cut into strips 5 cm long in the CD direction to obtain nonwoven fabric strips.

[0100] (v) Twisting The nonwoven fabric band was twisted using a roving frame (twist number 18 T / m) so that the MD direction of the laminated nonwoven fabric was the longitudinal direction of the string-like material, thereby obtaining a string-like material.

[0101] [Example 2] Cotton is carded using a parallel carding machine, with a basis weight of approximately 12 g / m 2 Two webs of this type were produced. Except for using these as the second and third fiber webs, a laminated nonwoven fabric and a string-like material were obtained in the same manner as in Example 1. The mass ratio of the first fiber web to the total of the second and third fiber webs (first / second+third) was 52 mass% / 48 mass%.

[0102] [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.

[0103] [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).

[0104] [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 laminated nonwoven fabric, and Table 2 shows the physical properties of the string-like material. For the evaluation, dry and wet laminated nonwoven fabrics and string-like materials were used as samples. Wet samples were obtained by impregnating 100 parts by mass of dry laminated nonwoven fabric or string-like material with 250 parts by mass of distilled water.

[0105] (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.

[0106] (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.

[0107] [Table 1]

[0108] [Table 2]

[0109] The present disclosure includes the following aspects. (Aspect 1) A string-like object formed by twisting strip-shaped laminated nonwoven fabrics, In the laminated nonwoven fabric, a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length that is 10 mm or more longer than the average fiber length of the first fibers, the first fiber layer and the second fiber layer being integrated by entanglement of the fibers; The string-like material is a laminated nonwoven fabric twisted so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material. (Aspect 2) The string-like material according to aspect 1, wherein the laminated nonwoven fabric is twisted so that the second fiber layer is on the outside. (Aspect 3) The string-like material according to aspect 1 or 2, wherein the first fibers have an average fiber length of 0.5 mm or more and 20 mm or less. (Aspect 4) The string-like material according to any one of Aspects 1 to 3, wherein the first fiber layer is formed from a wet-laid nonwoven fabric. (Aspect 5) The string-like material according to any one of Aspects 1 to 4, wherein at least one of the first fibers and the second fibers includes a biodegradable fiber. (Aspect 6) The string-like material according to any one of Aspects 1 to 5, wherein at least one of the first fibers and the second fibers includes cellulose fibers. (Aspect 7) The string-like material according to any one of Aspects 1 to 6, wherein the first fibers include pulp fibers. (Aspect 8) The string-like material according to any one of Aspects 1 to 7, wherein the laminated nonwoven fabric is a hydroentangled nonwoven fabric. (Aspect 9) An agricultural attractant cord using the cord-like material according to any one of embodiments 1 to 8. (Aspect 10) A packaging string using the string-like material according to any one of aspects 1 to 8. (Aspect 11) A method for producing a string-like object, preparing a laminated nonwoven fabric in which a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length 10 mm or more longer than the average fiber length of the first fibers are integrated by entanglement of the fibers; Cutting the laminated nonwoven fabric into strips; and twisting the strip-shaped laminated nonwoven fabric so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material. (Aspect 12) Aspect 12 is a method for producing a string-shaped material according to aspect 11, wherein the strip-shaped laminated nonwoven fabric is twisted so that the second fiber layer is on the outside. [Industrial Applicability]

[0110] The strings of the present disclosure have excellent maneuverability and handling properties, and are therefore useful as agricultural bait strings and baling strings.

Claims

1. A string-like object formed by twisting strip-shaped laminated nonwoven fabrics, In the laminated nonwoven fabric, a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length that is 10 mm or more longer than the average fiber length of the first fibers, the first fiber layer and the second fiber layer being integrated by entanglement of the fibers; The string-like material is a laminated nonwoven fabric twisted so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material.

2. The string-like material according to claim 1 , wherein the laminated nonwoven fabric is twisted so that the second fiber layer is on the outside.

3. The string-like material according to claim 1 , wherein the first fibers have an average fiber length of 0.5 mm or more and 20 mm or less.

4. The string-like material according to claim 1 , wherein the first fiber layer is formed of a wet-laid nonwoven fabric.

5. The string according to claim 1 , wherein at least one of the first fibers and the second fibers comprises a biodegradable fiber.

6. The string-like material according to claim 1 , wherein at least one of the first fibers and the second fibers comprises cellulose fibers.

7. The strand of claim 1 , wherein the first fibers include pulp fibers.

8. The string-like material according to claim 1 , wherein the laminated nonwoven fabric is a hydroentangled nonwoven fabric.

9. An agricultural attractant cord using the cord-like material according to any one of claims 1 to 8.

10. A packing string using the string-like material according to any one of claims 1 to 8.

11. A method for producing a string-like object, preparing a laminated nonwoven fabric in which a first fiber layer made of first fibers and a second fiber layer made of second fibers having an average fiber length 10 mm or more longer than the average fiber length of the first fibers are integrated by entanglement of the fibers; Cutting the laminated nonwoven fabric into strips; and twisting the strip-shaped laminated nonwoven fabric so that the MD direction of the laminated nonwoven fabric is the longitudinal direction of the string-like material.

12. The method for manufacturing a string-like material according to claim 11, wherein the strip-shaped laminated nonwoven fabric is twisted so that the second fiber layer is on the outside.

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