A single layer of elastic material and its use

Abstract

The present application belongs to the field of elastic materials, and relates to a single-layer elastic material and application thereof, the single-layer elastic material comprising elastic braids with entangled pores distributed along the warp direction; the elastic braids are braided or twisted threads of elastic strands; all the elastic braids are connected by non-elastic strands; each non-elastic strand shuttles between the left and right elastic braids along the warp direction to form a backfolding point, the non-elastic strand penetrates into the entangled pores of the elastic braid at the backfolding point and forms an entangled point; the breaking elongation of the non-elastic strand is less than or equal to 45%; in the relaxed state, the average value of the distance between all the adjacent left and right elastic braids is denoted as D*, and the standard deviation is denoted as p1, D* is greater than or equal to 2 mm, and p1 is less than or equal to 0.2; the application is that the single-layer elastic material is used to prepare elastic components of disposable absorbent articles. The present application solves the problem of too small elastic body spacing when the prior art uses non-woven fabric as a base to fix the arrangement of a plurality of elastic bodies.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of elastic materials, and relates to a single-layer elastic material and application thereof. BACKGROUND

[0002] In the current disposable absorbent products such as baby diapers, female menstrual pants, adult diapers and other sanitary and medical products, usually these absorbent products contain elastic material components to achieve wearing functions or to achieve the fit and fixation of the product to the skin, and the core material constituting the elastic material is an elastic strand, for example, a typical wire material mainly composed of high-resilience spandex yarn.

[0003] The traditional process is to assemble the elastic strand and the outer non-woven fabric (which includes one or more layers of surface non-woven fabric and possibly the bottom non-woven fabric, etc.) by parallel arrangement method to make the elastic material. In the process of using this processing technology, due to the specific arrangement requirements of the material structure on the spandex yarn, multiple spandex yarns are needed, and a series of processes such as warping, drawing, bonding or special devices are used to meet the use requirements.

[0004] Currently, the mainstream process is to use non-woven fabric as the base material, regularly and regularly arrange multiple groups of elastic strands in the horizontal direction to prepare the elastic material (i.e. three-layer non-woven fabric-based elastic material). Then, this elastic material is further used to prepare elastic components suitable for human wear. Currently, the technical personnel in the field are still mainly improving and developing around this process. For example, CN117338518A discloses a method for preparing an elastic material and an absorbent product. The method comprises the following steps: first, preparing a plurality of elastic bodies (i.e. elastic strands) and non-woven fabric base material; then, pretreating the elastic bodies; finally, according to the preset distribution mode, the pretreated elastic bodies are sewn in the form of sewing thread through the non-woven fabric base material, and are subjected to a reinforcing treatment, thereby obtaining the required elastic material. Through this method, the pretreated elastic bodies are sewn onto the non-woven fabric base material and are firmly fixed on the non-woven fabric base material by one or more fixing methods. This method can not only prevent the elastic material from being deformed due to dislocation, but also can make the elastic material maintain the characteristics of lightness, breathability and comfort, thereby improving the comfort of the wearer.

[0005] However, the elastic body spacing of the three-layer non-woven fabric-based elastic material needs to be controlled at 1mm. When the elastic body spacing is larger, there is no supporting force between the elastic bodies, resulting in a larger blank space after bonding with the top and bottom materials, poor bonding effect of the product, and a high probability of forming wrinkles, misalignment and air bubbles, which in turn leads to a decrease in the rebound effect. SUMMARY

[0006] The present application aims to solve the problems in the prior art and provide a single-layer elastic material and application thereof.

[0007] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0008] A single-layer elastic material comprises elastic braids with entangled apertures distributed along the warp direction;

[0009] The elastic braids are braided or twisted threads of elastic strands;

[0010] All the elastic braids are connected by multiple non-elastic strands;

[0011] Each non-elastic strand is shuttled between the left and right elastic braids along the warp direction to form a folding point, and when the non-elastic strand is shuttled between the left and right elastic braids along the weft direction, it cannot help to achieve the support of the expected elastic strand spacing. The non-elastic strand is inserted into the entangled apertures of the elastic braid at the folding point and forms an entangled point by knotting or the like, so that the position of the folding point on the elastic braid is fixed;

[0012] The breaking elongation of the non-elastic strand is ≤45%, so as to ensure that the elastic braids can obtain sufficient support;

[0013] In a relaxed state, the elastic braids are distributed in equal parallel lines, and the average value of the spacing between all adjacent left and right elastic braids is denoted as D*, and the standard deviation is denoted as p1, D*≥2mm, p1≤0.2, D* and p1 are calculated by randomly measuring the spacing D of 10 groups of adjacent elastic braids on the single-layer elastic material, When p1≤0.2, it is considered that the elastic braids in the single-layer elastic material are distributed in equal parallel lines.

[0014] The conventional elastic material needs to use non-woven fabric as a base to fix the arrangement of a plurality of elastic bodies (i.e. elastic strands), and is supported by the front and back non-woven fabrics in the direction perpendicular to the elastic bodies. The inventor found that this structure design has specific requirements for the elastic body spacing, and when the elastic body spacing is too large, the finished product is prone to wrinkles, misplacement, and air bubbles during actual use, resulting in a decrease in the rebound effect.

[0015] The inventor ingeniously designed a single-layer elastic material, in which the arrangement of the elastic bodies (i.e. elastic braids) is no longer fixed by the upper and lower non-woven fabrics with certain support. The present application sets non-elastic strands between the left and right elastic braids, and uses the non-elastic strands to hook the elastic bodies to fix the arrangement of the elastic bodies.

[0016] The present application controls each non-elastic strand to be shuttled between the left and right elastic braids along the warp direction, and finds that such a strand arrangement is beneficial to maintaining the distance between the elastic bodies.

[0017] The inventor found that, compared with the 1mm level of elastomer spacing commonly used in the prior art, the elastomer spacing (i.e., the chain spacing) of the present application is 2mm or more, which shows better rebound effect on the single-layer elastic material. However, in the traditional non-woven three-layer structure of the elastic material, the opposite trend is observed, which is speculated to be affected by the non-elastic strands. The more intensive the elastomer spacing, the more intensive the non-elastic strands on the single-layer elastic material, which hinders the stretching of the elastic strands to a certain extent.

[0018] Such elastic materials are similar to the warp-knitted garment fabric in manufacturing process, but they belong to different technical fields in essence. The elastic material of the present application is not suitable for garment fabric, because the material pursues loose arrangement between fibers, resulting in low strength, and is more suitable for disposable hygiene products rather than conventional garment fabric. Similarly, the existing warp-knitted garment fabric cannot use the elastic material of the present application, because the elastic material of the present application has specific requirements for the spacing of the elastomer, which does not meet the needs of garment fabric and does not satisfy the wearability of the garment. In addition, the warp-knitted structure is not conducive to the good support of the elastomer.

[0019] As a preferred technical solution:

[0020] The single-layer elastic material as described above, at least one non-elastic strand X is arranged between any two adjacent elastic chains on the left and right; in the relaxed state, the spacing of the inflection points on the same non-elastic strand X is equal, the average value of the spacing of any two adjacent inflection points on the same non-elastic strand X is denoted as L*, and the standard deviation is denoted as p2, L* / D* is greater than 1 and less than 1.4, and p2 is less than or equal to 0.2, L* and p2 are calculated by randomly measuring the spacing L of 10 groups of two adjacent inflection points on the same non-elastic strand X, When p2 is less than or equal to 0.2, it is considered that the spacing of the inflection points on the same non-elastic strand X is equal;

[0021] The equal spacing of any two adjacent inflection points on the same non-elastic strand X can make the minimum unit support force between the two adjacent chains of the single-layer elastic material come from the V-shaped structure formed by the single non-elastic strand X. If the spacing of any two adjacent inflection points on the same non-elastic strand X is too large, i.e., the length of the two line segments constituting the V-shaped structure is too large, the support force distributed to the non-elastic strand X at the same entanglement point will be uneven under external force, which will cause the support of the elastic chain to be poor.

[0022] The present application controls L* / D* to be greater than 1 and less than 1.4, which can ensure that the non-elastic strand can effectively support the two adjacent elastic chains on the left and right.

[0023] The single-layer elastic material as described above, one non-elastic strand X is arranged between any two adjacent elastic chains on the left and right, or two or more non-elastic strands X with the same shape or different shapes are arranged; the same hooking speed process parameters can be arranged during preparation to adjust the L value of the non-elastic strand X, and the relative deviation of the L* corresponding to the two non-elastic strands X under the same process is within ± 5%, which can be considered as the same shape of the two non-elastic strands X; otherwise, it is considered that the shapes of the two non-elastic strands X are different; the relative deviation = (the absolute value of the difference between the L* corresponding to the two non-elastic strands X / the average value of the L* corresponding to the two non-elastic strands X) x 100%.

[0024] The single-layer elastic material as described above, the number and shape of the non-elastic strands X between any two adjacent elastic chains on the left and right are the same; that is, when one non-elastic strand X is arranged between any two adjacent elastic chains on the left and right, the shapes of all non-elastic strands X are the same; when two or more non-elastic strands X with the same shape are arranged between any two adjacent elastic chains on the left and right, the shapes of all non-elastic strands X are the same; when two or more non-elastic strands X with different shapes are arranged between any two adjacent elastic chains on the left and right, assuming that the two or more non-elastic strands X with different shapes are non-elastic strand X1, non-elastic strand X2, …, the shapes of all non-elastic strands X1 are the same, and the shapes of all non-elastic strands X2 are the same; such arrangement can make the single-layer elastic material have a better hand feeling.

[0025] The single-layer elastic material as described above, the elastic chain is composed of a single elastic strand, and the elastic strand is hook-woven to form the elastic chain; or the elastic chain is composed of two or more elastic strands, and the elastic strands are formed into the elastic chain through any form (such as S winding or spiral weaving, etc.); the entanglement aperture is formed at the weaving entanglement of the elastic chain.

[0026] The single-layer elastic material as described above, the material, specification and hooking count of the elastic strands in all elastic chains are the same, the hooking count of the elastic strands in the elastic chain is adjusted according to actual needs, for example, can be 1 strand, 3 strands, 5 strands, 10 strands, etc., to control the thickness of the elastic chain as a whole to adapt to the target requirements; the material and specification of all non-elastic strands are the same; the linear density of the elastic strands is 16.5-155 dtex; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the hooking count of the elastic strands in the elastic chain, and the value range of α is 1.1-2.0; in the field of sanitary materials, especially in the field of wearing paper diapers, the requirement for non-sensing wearing is higher, that is, it cannot cause obvious wearing compression to the human body, and the linear density of the non-elastic strands is set according to the linear density of the elastic strands and the hooking count of the elastic strands in the elastic chain, so that it can avoid that the linear density of the non-elastic strands is too large relative to the linear density of the elastic chain, the non-elastic strands are exposed seriously, the material is relatively hard, the friction is too large, and it is easy to cause uncomfortable body feeling in the use process, and it can also avoid that the linear density of the non-elastic strands is too small, the supporting property of the non-elastic strands is insufficient, and it is difficult to maintain the target distance between the elastic chains.

[0027] The single-layer elastic material as described above, the breaking strength of the elastic strands is ≥0.7 cN / dtex, the breaking elongation rate is ≥470%, and the 300% elastic recovery rate is ≥90%; the breaking strength of the non-elastic strands is ≥2.5 cN / dtex, the non-elastic strands should have a certain breaking strength to meet the processability of the single-layer elastic material, the breaking elongation rate is ≥20%, and if the breaking elongation rate of the non-elastic strands is too low, the rigidity of the fiber is too strong, the single-layer elastic material feels too hard, and it is easy to cause uncomfortable wearing of the sanitary product and compression to the skin.

[0028] The single-layer elastic material as described above, D*≤10 mm; the larger the distance between the elastic bodies, the more difficult to achieve the supporting effect, and the corresponding elastic effect will also be attenuated, so the upper limit of the chain distance is set to reduce the difficulty of achieving the supporting effect.

[0029] The single-layer elastic material as described above, the tensile elastic recovery rate of the single-layer elastic material is 95-99%, and the stiffness is 5-10.5 mm; the wearing performance test result of the single-layer elastic material is comfortable wearing and no marks. The non-elastic strands in the single-layer elastic material have a good supporting effect on the elastic chains, which shows better stiffness. The single-layer elastic material has good elastic recovery, and when the external force is removed, the distance between any two adjacent elastic chains on the left and right sides returns to the distance before the external force is applied.

[0030] The application also provides an application of the single-layer elastic material as described in any one of the above, which is used for preparing an elastic component of a disposable absorbent product.

[0031] Advantages:

[0032] The present application realizes the fixation of the arrangement of the elastic body by setting the non-elastic strand between the left and right elastic braids and using the non-elastic strand to hook the elastic body, and solves the problem of too small spacing between the elastic bodies when the non-woven fabric is used as a base to fix the arrangement of the elastic bodies (i.e. elastic strands) in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The elastic braids formed by the single-strand, double-strand and triple-strand elastic strands of the present application respectively; a is the schematic diagram of the elastic braid formed by the single-strand elastic strand, b is the schematic diagram of the elastic braid formed by the double-strand elastic strand, and c is the schematic diagram of the elastic braid formed by the triple-strand elastic strand;

[0034] Figure 2 The schematic diagram of the non-elastic strand of the present application knotting to form a knot in the entanglement aperture of the elastic braid composed of the single-strand elastic strand;

[0035] Figure 3 The schematic diagram of the non-elastic strand of the present application knotting to form a knot in the entanglement aperture of the elastic braid composed of the triple-strand elastic strand;

[0036] Figure 4 The schematic diagram of the shuttle of the non-elastic strand between any two adjacent elastic braids in the single-layer elastic material of the present application; wherein A1-A3 represent three adjacent inflection points respectively;

[0037] Figure 5 The schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiments 1-5 of the present application; wherein a is the schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiments 1, 4-5, b is the schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiment 2, and c is the schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiment 3;

[0038] Figure 6 The schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiments 6-7 of the present application; wherein a is the schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiment 6, and b is the schematic diagram of the shuttle of the non-elastic strand between the first to third elastic braids from left to right in the single-layer elastic material of the embodiment 7;

[0039] Figure 7 The schematic diagram of the stiffness test of the present application; wherein a corresponds to the initial stage of the test, and b corresponds to the termination stage of the test;

[0040] Among them, 1-entanglement pores, 2-inelastic strands, 3-elastic chains, 4-entanglement points, and 5-elastic strands. Detailed Implementation

[0041] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0042] The following is an explanation of the terms used in this invention:

[0043] "Relaxed state" refers to the state of a single-layer elastic material when it is not subjected to external force.

[0044] "Stress state" refers to the state of a single-layer elastic material when subjected to external force.

[0045] Unless otherwise specified, all numerical values ​​representing dimensional parameters in this document should be understood in all cases to include rounded values. For example, actual calculated average deviations p of 0.18 and 0.23 should be considered equal to the value 0.2.

[0046] This invention defines elastic strands using parameters such as linear density, elongation ratio, and tensile recovery rate, and is not limited to specific fiber materials. For example, spandex, elastic fibers, TPEE fibers, etc., any fiber material that meets these parameters falls within the scope of this invention's selection of elastic strands. The selection and limitation of elastic strands are already within the scope of existing technology. Therefore, those skilled in the art can make appropriate adjustments according to specific application requirements.

[0047] This invention defines inelastic yarns based on parameters such as linear density and tensile strength, and is not limited to specific fiber materials. Examples include polyester filament, polyester low-elasticity yarn, nylon filament, nylon low-elasticity yarn, PLA filament, and PLA low-elasticity yarn; any fiber material that meets the defined parameters such as linear density and tensile strength falls within the scope of this invention's selection of inelastic yarns. The selection and limitation of inelastic yarns are already within the scope of existing technology. Therefore, those skilled in the art can make appropriate adjustments based on specific application requirements.

[0048] The test methods for the relevant performance indicators in the following embodiments and comparative examples are as follows:

[0049] Linear density: The elastic and non-elastic strands were tested in accordance with the FZ / T54010-2014 standard.

[0050] Tensile strength: The elastic and non-elastic strands were tested according to the FZ / T54010-2014 standard;

[0051] Elongation at break: The elastic and non-elastic strands were tested according to the FZ / T54010-2014 standard;

[0052] 300% elastic recovery rate: The elastic stock was tested according to the FZ / T54010-2014 standard;

[0053] Rebound effect: The single-layer elastic material was tested according to the method of FZ / T70006-2022 standard 8.3.1.1. The tensile elastic recovery rate was measured with a predetermined elongation of 200%, a pre-tension of 0.1N, and a tensile speed of 300mm / min.

[0054] Erection test: such as Figure 7 As shown, a single-layer elastic material is used to prepare a specimen with a length (l1) × width of 200 mm × 60 mm. The specimen is placed on the plane of a specimen stage with an incline angle of 30° (length × width 500 mm × 80 mm) and advanced towards the incline at a speed of 100 mm / min. Advancement is stopped when the head of the specimen contacts the incline. At this point, the length l2 of the specimen located on the plane of the specimen stage is measured. The formula a = l1 - l2 is calculated, and a characterizes the stiffness; the smaller the a, the worse the stiffness of the specimen.

[0055] Wearability test: A single layer of elastic material was made into a bandage with a length × width of 60cm × 15cm and worn by people with a waist circumference of 75-85cm. The comfort and marks were evaluated after 4 hours.

[0056] Example 1

[0057] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0058] (1) Preparation of raw materials;

[0059] Elastic strand: linear density is 16.5 dtex, tensile strength is 0.9 cN / dtex, elongation at break is 470%, and elastic recovery rate is 90% at 300%;

[0060] Non-elastic strand: linear density of 33 dtex, tensile strength of 3.5 cN / dtex, and elongation at break of 25%;

[0061] (2) Warping and setting;

[0062] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0063] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0064] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0065] (3) Hooking and weaving;

[0066] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0067] The left and right elastic braids move forward at a constant speed along the warp direction;

[0068] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0069] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0070] Elastic braided yarn is a braided yarn composed of single elastic strands, specifically as follows: Figure 1 As shown in Figure a, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 2.0.

[0071] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 2 mm and p1 is 0.2.

[0072] A non-elastic strand is placed between any two adjacent flexible braids on the left and right;

[0073] Each non-elastic strand runs along the warp direction between two adjacent elastic braids, forming a turning point, such as... Figure 2 As shown, at the turning point, the non-elastic strand 2 enters the entanglement gap 1 of the elastic braided chain 3 and forms an entanglement point 4 by means of knotting, etc.

[0074] The entire single-layer elastic material is composed of Figure 5 The structure shown in Figure a is used as a basic unit and is formed by repeatedly laying it to the right. In the relaxed state, the spacing between the turning points on the same inelastic strand is equal. The average spacing between all two adjacent turning points on the same inelastic strand is denoted as L*, and the standard deviation is denoted as p2. L* / D* is 1.4, and p2 is 0.2.

[0075] The tensile elastic recovery rate of the single-layer elastic material is 96%, the stiffness is 5mm, and the wear performance test results of the single-layer elastic material are comfortable to wear and leave no marks.

[0076] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0077] Comparative Example 1

[0078] A single-layer elastic material, basically the same as in Example 1, except that: in the relaxed state, the elastic braids are distributed in equally divided parallel lines, and the average distance D* between all two adjacent elastic braids on the left and right is 1.5 mm; in the relaxed state, the average distance L* between all two adjacent folding points on the same non-elastic strand is 2.1 mm.

[0079] The tensile elastic recovery rate of the single-layer elastic material is 89%, and the stiffness is 6mm.

[0080] Comparing Comparative Example 1 and Example 1, it can be seen that the single-layer elastic material prepared in Example 1 has a better rebound effect. This is because when the braiding spacing is 2mm or larger, it exhibits a better rebound effect.

[0081] Comparative Example 2

[0082] A single-layer elastic material, basically the same as in Example 1, except that: in the relaxed state, the average distance L* between all two adjacent fold points on the same non-elastic strand is 3, and L* / D* is 1.5;

[0083] The tensile elastic recovery rate of the single-layer elastic material is 95%, and the stiffness is 2.5mm.

[0084] Comparing Comparative Example 2 and Example 1, it can be seen that the non-elastic strands in the single-layer elastic material prepared in Example 1 can effectively support the two adjacent elastic braids on the left and right.

[0085] Comparative Example 3

[0086] A method for preparing a single-layer elastic material is basically the same as in Example 1, except that the elongation at break of the non-elastic strand prepared in step (1) is 16%.

[0087] The final single-layer elastic material had a tensile elastic recovery rate of 93% and a stiffness of 7.2 mm. The wear performance test results of the single-layer elastic material showed that it caused a feeling of pressure and left marks after wearing it for 4 hours.

[0088] Comparing Comparative Example 3 with Example 1, it can be seen that the single-layer elastic material prepared in Comparative Example 3 has poor rebound effect and high stiffness. Products made with it will feel oppressive during use and will leave marks after wearing for 4 hours.

[0089] Comparative Example 4

[0090] A method for preparing a single-layer elastic material is basically the same as in Example 1, except that the elongation at break of the non-elastic strand prepared in step (1) is 55%.

[0091] The final single-layer elastic material has a tensile elastic recovery rate of 94% and a stiffness of 2.7 mm.

[0092] Comparing Comparative Example 4 with Example 1, it can be seen that the single-layer elastic material prepared in Comparative Example 4 has poor stiffness and insufficient support.

[0093] Comparative Example 5

[0094] A method for preparing a single-layer elastic material is basically the same as in Example 1, except that the linear density of the non-elastic strands prepared in step (1) is 50 dtex.

[0095] The final single-layer elastic material is basically the same as in Example 1, except that the value of α is 3.0.

[0096] The tensile elastic recovery rate of the single-layer elastic material is 92%, the stiffness is 6.5mm, and the wear performance test results of the single-layer elastic material show that it causes a feeling of pressure and leaves marks after wearing it for 4 hours.

[0097] Comparing Comparative Example 5 with Example 1, it can be seen that the single-layer elastic material prepared in Comparative Example 5 has poor rebound effect. This is because the excessive linear density of the non-elastic strands leads to excessive friction, and the products prepared with it are prone to causing discomfort during use, and will leave marks after 4 hours of wear.

[0098] Comparative Example 6

[0099] A method for preparing a single-layer elastic material is basically the same as in Example 1, except that the linear density of the non-elastic strands prepared in step (1) is 10 dtex.

[0100] The final single-layer elastic material is basically the same as in Example 1, except that the value of α is 0.6.

[0101] The tensile elastic recovery rate of the single-layer elastic material is 95%, and the stiffness is 3.1 mm.

[0102] Comparing Comparative Example 6 with Example 1, it can be seen that the single-layer elastic material prepared in Comparative Example 6 has poor stiffness. This is because the linear density of the non-elastic strands is too small, which leads to insufficient support of the non-elastic strands and makes it difficult to maintain the target spacing between the elastic braids.

[0103] Example 2

[0104] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0105] (1) Preparation of raw materials;

[0106] Elastic strand: linear density is 33.3 dtex, tensile strength is 1.05 cN / dtex, elongation at break is 500%, and elastic recovery rate is 91% at 300%;

[0107] Non-elastic strand: linear density of 56 dtex, tensile strength of 3.2 cN / dtex, and elongation at break of 35%;

[0108] (2) Warping and setting;

[0109] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0110] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0111] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0112] (3) Hooking and weaving;

[0113] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0114] The left and right elastic braids move forward at a constant speed along the warp direction;

[0115] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0116] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0117] Elastic braided yarn is a braided yarn composed of single elastic strands, specifically as follows: Figure 1 As shown in Figure a, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 1.7.

[0118] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 3 mm and p1 is 0.2.

[0119] A non-elastic strand is placed between any two adjacent flexible braids on the left and right;

[0120] like Figure 4 As shown, each non-elastic strand shuttles along the warp direction between two adjacent elastic braids to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point through knotting and other methods.

[0121] The entire single-layer elastic material is composed of Figure 5 The structure shown in b is used as a basic unit and is formed by repeatedly laying it to the right. In the relaxed state, the spacing between the turning points on the same inelastic strand is equal. The average spacing between all two adjacent turning points on the same inelastic strand is denoted as L*, and the standard deviation is denoted as p2. L* / D* is 1.23, and p2 is 0.2.

[0122] The tensile elastic recovery rate of the single-layer elastic material is 98%, the stiffness is 5.5mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0123] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0124] Example 3

[0125] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0126] (1) Preparation of raw materials;

[0127] Elastic strand: linear density of 44 dtex, breaking strength of 1 cN / dtex, breaking elongation of 520%, and 300% elastic recovery rate of 92%;

[0128] Non-elastic strand: linear density of 78 dtex, tensile strength of 3.8 cN / dtex, and elongation at break of 36%;

[0129] (2) Warping and setting;

[0130] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0131] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0132] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0133] (3) Hooking and weaving;

[0134] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0135] The left and right elastic braids move forward at a constant speed along the warp direction;

[0136] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0137] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0138] Elastic braided yarn is a braided yarn composed of single elastic strands, specifically as follows: Figure 1 As shown in Figure a, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 1.8.

[0139] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 3.7 mm, and p1 is 0.2 mm.

[0140] A non-elastic strand is placed between any two adjacent flexible braids on the left and right;

[0141] Each non-elastic strand runs along the warp direction between two adjacent elastic braids to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point through knotting and other methods.

[0142] The entire single-layer elastic material is composed of Figure 5 The structure shown in c is used as a basic unit and is formed by repeatedly laying it to the right. In the relaxed state, the spacing between the turning points on the same inelastic strand is equal. The average spacing between all two adjacent turning points on the same inelastic strand is denoted as L*, and the standard deviation is denoted as p2. L* / D* is 1.08, and p2 is 0.1.

[0143] The tensile elastic recovery rate of the single-layer elastic material is 98%, the stiffness is 6.2mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0144] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0145] Example 4

[0146] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0147] (1) Preparation of raw materials;

[0148] Elastic strand: linear density of 78 dtex, tensile strength of 1.1 cN / dtex, elongation at break of 550%, and elastic recovery of 93% at 300%;

[0149] Non-elastic strand: linear density is 111 dtex, tensile strength is 4.1 cN / dtex, and elongation at break is 42%;

[0150] (2) Warping and setting;

[0151] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0152] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0153] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0154] (3) Hooking and weaving;

[0155] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0156] The left and right elastic braids move forward at a constant speed along the warp direction;

[0157] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0158] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0159] Elastic braided yarn is a braided yarn composed of single elastic strands, specifically as follows: Figure 1As shown in Figure a, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 1.4.

[0160] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 6.5 mm, and p1 is 0.2 mm.

[0161] A non-elastic strand is placed between any two adjacent flexible braids on the left and right;

[0162] Each non-elastic strand runs along the warp direction between two adjacent elastic braids to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point through knotting and other methods.

[0163] The entire single-layer elastic material is composed of Figure 5 The structure shown in Figure a is used as a basic unit and is formed by repeatedly laying it to the right. In the relaxed state, the spacing between the turning points on the same inelastic strand is equal. The average spacing between all two adjacent turning points on the same inelastic strand is denoted as L*, and the standard deviation is denoted as p2. L* / D* is 1.12, and p2 is 0.2.

[0164] The tensile elastic recovery rate of the single-layer elastic material is 99%, the stiffness is 9mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0165] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0166] Example 5

[0167] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0168] (1) Preparation of raw materials;

[0169] Elastic strand: linear density is 155 dtex, tensile strength is 0.7 cN / dtex, elongation at break is 560%, and elastic recovery rate is 93% at 300%;

[0170] Non-elastic strand: linear density of 165 dtex, tensile strength of 2.5 cN / dtex, and elongation at break of 23%;

[0171] (2) Warping and setting;

[0172] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0173] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0174] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0175] (3) Hooking and weaving;

[0176] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0177] The left and right elastic braids move forward at a constant speed along the warp direction;

[0178] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0179] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0180] Elastic braided yarn is a braided yarn composed of single elastic strands, specifically as follows: Figure 1 As shown in Figure a, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 1.1.

[0181] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 10 mm, and p1 is 0.2.

[0182] A non-elastic strand is placed between any two adjacent flexible braids on the left and right;

[0183] Each non-elastic strand runs along the warp direction between two adjacent elastic braids to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point through knotting and other methods.

[0184] The entire single-layer elastic material is composed of Figure 5 The structure shown in Figure a is used as a basic unit and is formed by repeatedly laying it to the right. In the relaxed state, the spacing between the turning points on the same inelastic strand is equal. The average spacing between all two adjacent turning points on the same inelastic strand is denoted as L*, and the standard deviation is denoted as p2. L* / D* is 1.11, and p2 is 0.2.

[0185] The tensile elastic recovery rate of the single-layer elastic material is 97%, the stiffness is 10.5mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0186] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0187] Example 6

[0188] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0189] (1) Preparation of raw materials;

[0190] Elastic strand: linear density is 16.5 dtex, tensile strength is 0.9 cN / dtex, elongation at break is 470%, and elastic recovery rate is 90% at 300%;

[0191] Non-elastic strand: linear density of 33 dtex, tensile strength of 3.5 cN / dtex, and elongation at break of 25%;

[0192] (2) Warping and setting;

[0193] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0194] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0195] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0196] (3) Hooking and weaving;

[0197] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0198] The left and right elastic braids move forward at a constant speed along the warp direction;

[0199] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0200] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0201] Elastic braided strands are twisted wires composed of two elastic strands, specifically as follows: Figure 1 As shown in Figure b, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 1.

[0202] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 3.5 mm, and p1 is 0.11.

[0203] Two non-elastic strands are set between any two adjacent elastic braids on the left and right, namely elastic strand X1 and elastic strand X2.

[0204] Each non-elastic strand runs along the warp direction between two adjacent elastic braids to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point through knotting and other methods.

[0205] The entire single-layer elastic material is composed of Figure 6 The structure shown in diagram a is used as a basic unit and is formed by repeatedly laying it to the right. Figure 6 The structure shown in Figure a consists of four elastic strands. Two elastic strands X1 have the same shape, and two elastic strands X2 have the same shape. Elastic strands X1 and X2 have the same shape. In the relaxed state, the spacing between the turning points on the same non-elastic strand X1 is equal. The average spacing between all two adjacent turning points on the same non-elastic strand X1 is denoted as L1*, and the standard deviation is denoted as p2. L1* / D* is 1.37, and p2 is 0.24. Similarly, in the relaxed state, the spacing between the turning points on the same non-elastic strand X1 is equal, and the average spacing between all two adjacent turning points on the same non-elastic strand X2 is denoted as L2*, and the standard deviation is denoted as p2. L2* / D* is 1.34, and p3 is 0.22.

[0206] The tensile elastic recovery rate of the single-layer elastic material is 95%, the stiffness is 5.5mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0207] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

[0208] Example 7

[0209] A method for preparing a single-layer elastic material, comprising the following specific steps:

[0210] (1) Preparation of raw materials;

[0211] Elastic strand: linear density is 33.3 dtex, tensile strength is 1.05 cN / dtex, elongation at break is 500%, and elastic recovery rate is 91% at 300%;

[0212] Non-elastic strand: linear density of 80 dtex, tensile strength of 3.3 cN / dtex, and elongation at break of 32%;

[0213] (2) Warping and setting;

[0214] The elastic strands are warped and each elastic strand is pulled to the eye of the needle in the needle bed 1. The spacing between two adjacent eyelets is adjusted so that the eyelets of the needle bed 1 are evenly spaced.

[0215] The non-elastic strands are warped and each non-elastic strand is pulled to the eye of the needle bed 2. The spacing between two adjacent eye holes is adjusted so that the eye holes of the needle bed 2 are evenly spaced.

[0216] Each eye of a needle in two adjacent needle beds 1 has a corresponding eye in a needle bed 2;

[0217] (3) Hooking and weaving;

[0218] The needle eyes of two adjacent needle beds 1 respectively hook and braid two elastic strands to form a left elastic braid and a right elastic braid with entanglement gaps;

[0219] The left and right elastic braids move forward at a constant speed along the warp direction;

[0220] The needle eye of the corresponding needle bed 2 moves back and forth at a constant speed along the weft direction. When it moves to the left elastic chain, a single non-elastic strand is inserted into the entanglement hole of the left elastic chain and then tied with a hook to form an entanglement point. When it moves to the right elastic chain, a single non-elastic strand is inserted into the entanglement hole of the right elastic chain and then tied with a hook to form an entanglement point.

[0221] The final single-layer elastic material consists of inelastic strands and elastic braids with entangled pores distributed along the warp direction;

[0222] Elastic braided strands are twisted wires composed of three elastic strands, specifically as follows: Figure 1 As shown in Figure c, the entanglement pores 1 are distributed along the warp direction; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of strands in the elastic braid, where α is 0.8.

[0223] In the relaxed state, the elastic braids are distributed in equal parallel lines. The average distance between all two adjacent elastic braids on the left and right is denoted as D*, and the standard deviation is denoted as p1. D* is 3.6 mm, and p1 is 0.1.

[0224] Two non-elastic strands are placed between any two adjacent left and right elastic braids;

[0225] Each non-elastic strand runs along the warp direction between two adjacent elastic braids, forming a turning point, such as... Figure 3 As shown, at the turning point, the non-elastic strand 2 enters the entanglement gap 1 of the elastic braided chain 3 and forms an entanglement point 4 by means of knotting, etc.

[0226] The entire single-layer elastic material is composed of Figure 6 The structure shown in b is used as a basic unit and is formed by repeatedly laying it to the right. Figure 6 The structure shown in Figure b consists of four elastic strands. Two elastic strands X1 have the same shape, and two elastic strands X2 have the same shape. Elastic strands X1 and X2 have different shapes. In the relaxed state, the spacing between the turning points on the same non-elastic strand X1 is equal. The average spacing between all two adjacent turning points on the same non-elastic strand X1 is denoted as L1*, and the standard deviation is denoted as p2. L1* / D* is 1.17, and p2 is 0.11. In the relaxed state, the spacing between the turning points on the same non-elastic strand X2 is equal. The average spacing between all two adjacent turning points on the same non-elastic strand X2 is denoted as L2*, and the standard deviation is denoted as p3. L2* / D* is 1.19, and p3 is 0.12.

[0227] The tensile elastic recovery rate of the single-layer elastic material is 96%, the stiffness is 6.2mm, and the wear performance test results of the single-layer elastic material are that it is comfortable to wear and leaves no marks.

[0228] The aforementioned single-layer elastic material can be used to prepare elastic components for disposable absorbent products.

Claims

1. A single-layer elastic material, characterized in that, Including elastic braided chains with entangled pores distributed along the warp direction; Elastic braided strands are braided or stranded yarns made of elastic strands; All flexible braids are connected by multiple strands of non-flexible wire; Each non-elastic strand runs along the warp direction between the two elastic braids on the left and right to form a turning point. At the turning point, the non-elastic strand enters the entanglement gap of the elastic braid and forms an entanglement point. The breaking elongation of non-elastic strands is ≤45%; In the relaxed state, the average distance between all two adjacent elastic braids is denoted as D*, and the standard deviation is denoted as p1. D* ≥ 2 mm, D* ≤ 10 mm, and p1 ≤ 0.

2. D* and p1 are calculated by randomly measuring the distance D between 10 sets of adjacent elastic braids on a single layer of elastic material. ; At least one inelastic strand X is placed between any two adjacent elastic braids on the left and right sides. In the relaxed state, the average distance between all two adjacent turning points on the same inelastic strand X is denoted as L*, and the standard deviation is denoted as p2. L* / D* is greater than 1 and less than 1.4, and p2 ≤ 0.

2. L* and p2 are calculated by randomly measuring the distance L between 10 sets of two adjacent turning points on the same inelastic strand X. .

2. The single-layer elastic material according to claim 1, characterized in that, A non-elastic strand X is set between any two adjacent elastic braids on the left and right, or two or more non-elastic strands X with the same or different shapes are set.

3. The single-layer elastic material according to claim 2, characterized in that, The number and shape of the inelastic strands X between any two adjacent elastic braids on the left and right are the same.

4. The single-layer elastic material according to claim 1, characterized in that, The elastic chain is composed of a single elastic strand, which weaves itself to form an elastic chain; or, the elastic chain is composed of two or more elastic strands, which form an elastic chain in any way; entanglement gaps are formed at the weaving entanglement points of the elastic chain.

5. A single-layer elastic material according to claim 4, characterized in that, All elastic strands in the elastic braid have the same material, specifications, and number of braided strands; all non-elastic strands have the same material and specifications; the linear density of the elastic strands is 16.5-155 dtex; the linear density of the non-elastic strands = α × the linear density of the elastic strands × the number of braided strands in the elastic braid, where α ranges from 1.1 to 2.

0.

6. The single-layer elastic material according to claim 1, characterized in that, The tensile strength of elastic strands is ≥0.7cN / dtex, the elongation at break is ≥470%, and the 300% elastic recovery rate is ≥90%; the tensile strength of non-elastic strands is ≥2.5cN / dtex, and the elongation at break is ≥20%.

7. The application of a single-layer elastic material as described in any one of claims 1-6, characterized in that, Elastic components used in the manufacture of disposable absorbent products.

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