Annular elastic woven tape and production method therefor

Abstract

Disclosed in the present invention is an annular woven tape, comprising a tape body and a coupling part, wherein the tape body has two ends A and B, the two ends being respectively layered into an upper layer Au and a lower layer Al, which have the same length (L1), and an upper layer Bu and a lower layer Bl, which have the same length; the coupling part comprises: (a) an upper-layer fabric a formed by butting Au and Bu, (b) at least one layer of adhesive film b, (c) a reinforcement-layer fabric c, and (d) a lower-layer fabric d formed by butting Al and Bl; and the layers of the coupling part are bonded into a whole by means of the adhesive film, and the coupling part forms the annular woven tape together with the tape body. Thus, an elastic, breathable and moisture-permeable annular woven tape having a flat and smooth seam is obtained. This method effectively improves the factors in traditional processes that affect wearing comfort, such as the lack of elasticity or slight elasticity, poor breathability and difficulty in sweat passing through of a seamless welded part; moreover, while meeting the required strength for wearing, the number of connecting lines at the coupling part is reduced from four in the offset bonding method to three, thus facilitating large-scale industrial production.

Description

Annular elastic webbing and production method thereof Technical Field

[0001] The invention belongs to the technical field of clothing auxiliary material preparation, and particularly relates to an elastic breathable ring-shaped webbing produced by utilizing seamless splicing technology and a production method thereof. Background Art

[0002] As consumers' demands for comfort, personalization and aesthetics increase, the materials, designs and processing technology of webbings are constantly improving, and the trend of technological innovation is becoming increasingly obvious.

[0003] 1. Comfort: Consumers will require elastic webbing to have higher comfort, including better fit, softness and breathability, and they will also pursue more exquisite, high-end and smooth texture.

[0004] 2. Elasticity: Consumers will require elastic webbing to have better elasticity to meet the needs of different body shapes and sports.

[0005] 3. Durability: Consumers will demand that elastic webbing have a longer service life.

[0006] 4. Personalization and aesthetics: Consumers will require waist elastic webbing to meet their personalized needs, such as different colors, patterns and sizes.

[0007] 5. Environmental protection: Both consumers and manufacturers may require that waist elastic webbing be environmentally friendly.

[0008] The production of webbing is a continuous linear product that appears as an accessory on clothing products. A large category of application scenarios is to cut the linear webbing to the appropriate length and close the two ends to form a ring-shaped component to provide a certain degree of elasticity and pressure. Typical products are the waistband on underwear or the bottom band of a bra. The traditional process is to sew the two ends of the elastic webbing together. However, this process has room for improvement in terms of wearing experience. For example, (1) the stitching of the seams causes a scratchy touch on the skin, (2) the seams also affect the appearance, and (3) it is very difficult to accurately align the pattern on the surface of the webbing during the production process.

[0009] The production process of seamless webbing has also emerged. Some manufacturers have also introduced new processes such as ultrasonic welding and hot pressing to further improve the quality and performance of products. The industry usually adopts the following two processes:

[0010] 1. Hot-melt lamination technology: Hot-melt lamination utilizes high temperature and high pressure to press two or more materials together. In seamless hot-melt-processed waistbands, hot-melt lamination can be used to fuse fabrics, spandex, and other materials together to form a tightly bound, closed elastic webbing. However, when the lamination surface is perpendicular to the fracture surface, the spandex at the end can easily shrink and become unable to reset during stretching, a phenomenon known in the industry as root shrinkage.

[0011] 2. Ultrasonic welding technology: Ultrasonic welding technology uses ultrasonic vibrations to join two materials together. In seamless hot-melt waistbands, ultrasonic welding technology can be used to weld materials such as fabric and spandex together to form a seamless, closed elastic webbing.

[0012] These two processing technologies usually adopt two structures of alignment or offset bonding in operation. The alignment bonding method is a method of joining two parts or materials at a specific position relative to one another. In this method, the position and joining method of the joining parts can theoretically be precisely and accurately aligned to ensure the connection of the pattern, but the alignment bonding method usually requires manual or machine alignment and joining, which requires the operator to have certain skills and professional knowledge. At the same time, alignment bonding is prone to insufficient bonding strength and breakage during use because the bonding surface is perpendicular to the processing pressure direction. The offset bonding method is a method of joining two parts or materials at the joining surface relative to one another. In this method, the position and joining method of the joining parts can be determined automatically, and precise alignment is not required. However, if the ultrasonic welding technology adopts the positioning welding structure in the production of the belt, the positioning of the pattern can be well solved. However, due to the thickness and elasticity of the ribbon, the welding working surface is perpendicular to the ultrasonic welding surface, so the welding strength is not enough to meet the multiple stretching requirements and is prone to breakage; hot melt pressing technology fuses fabrics and elastic fibers and other materials together, but the fitting position is not elastic or slightly elastic. At the same time, the use of the membrane also makes the fitting position airtight, blocking the transfer of sweat, and the high requirements for the pattern during the fitting process greatly affect the production efficiency.

[0013] Therefore, in order to improve the above-mentioned problems encountered in the production process of seamless elastic webbing, such as no elasticity or slight elasticity in the laminating section, airtightness or root shrinkage, and low breaking strength, the present application discloses the following solution.

[0014] Summary of the Invention

[0015] In response to the common problems encountered in the design and processing of seamless closed elastic webbings, such as the feel, the appearance of the pattern, and the fastness of the fit, the present application discloses a new process method that is simple to operate and convenient for aligning the appearance pattern. The produced circular elastic webbing has a good feel and is a new circular elastic webbing with a balance of multiple properties such as tensile breaking strength, elasticity, breathability and moisture permeability.

[0016] Figure 2 describes the design and implementation process of a stretchy, breathable, counter-rotating ring webbing. Based on the tensile strength requirements of the final product, webbing products with three different tensile breaking strengths, low, medium, and high, can be selected and output.

[0017] The annular elastic webbing is a seamless annular elastic webbing formed by seamless hot-melt bonding or ultrasonic welding of a straight open-loop elastic webbing; its characteristics are as follows: (1) the webbing has two parts: a belt body and a connecting part; the two ends of the webbing (end A, end B) are connecting parts and their length is L1, which are two strips of elastic fabric (upper elastic fabric Au, Bu, lower elastic fabric (Al, Bl)) that are completely separated or partially separated from each other as shown in FIG5; (2) the upper elastic fabric (Au) at end A and the upper elastic fabric (Bu) at end B are welded side by side tightly and seamlessly, and the lower elastic fabric (Al) at end A and the lower elastic fabric (Bl) at end B are welded side by side tightly and seamlessly, and a schematic diagram of single-layer counter-position welding is shown in FIG6; (3) an elastic breathable hot-melt component F can be added between the upper and lower elastic fabrics as needed, or only hot-pressed and welded with the hot-melt adhesive film (b), as shown in FIG1; The two layers of butt-welded seams create a smooth, elastic, and breathable loop webbing. Assuming the tensile strength meets the required breaking strength, butt-welded construction is more convenient for pattern alignment than staggered construction, and it also reduces the visible seam, particularly on light-colored webbing. Adding elastic, breathable hot-melt components to a staggered construction results in four visible seams, while a butt-welded construction, due to the overlapping upper and lower seams, only three are visible. This further enhances the product's aesthetics.

[0018] Before designing the endless seamless webbing, the materials used must be measured. For the selected webbing, the elastic moduli (K1, K2, and K3) of the upper and lower layers of elastic fabric, both at the webbing body and at the joint, must be measured. The joint length, L1, must be greater than 0.5 cm, preferably 4 or 5 cm. This facilitates alignment and ultrasonic welding during production. During this process, the upper elastic fabric layer of the webbing faces face-to-face; the bottom layers are aligned and paralleled, then ultrasonically welded to create the endless elastic webbing. However, the tensile strength at this point is determined solely by the welded fracture surface, which is relatively small, resulting in very low tensile strength. If this effect is required for a specific design, this product is a viable option.

[0019] If higher requirements are placed on tensile fracture resistance, an elastic hot-melt assembly is used in the disclosed process. Specifically, the elastic, breathable hot-melt assembly F comprises at least one adhesive film b, preferably a highly elastic hot-melt adhesive film b, which is further laminated with a reinforcement fabric (elastic mesh fabric) and the highly elastic hot-melt adhesive film b to form the elastic, breathable hot-melt assembly F. During application, the assembly F has a width equal to or less than the width of the circular webbing, a length greater than 2 cm and less than twice L1 - 0.5 mm, and an elastic modulus K4 of the hot-melt adhesive film b less than the minimum elastic modulus min (K1, K2, k3).

[0020] Because elastic materials generally lose elasticity during the lamination process, or even become non-elastic or slightly elastic, this application conducts in-depth research and proposes solutions:

[0021] (1) Before lamination, the tensile fracture characteristics of the film material are measured to understand the elongation at break of the film. Since the change in normal human body size due to different body positions during wearing is less than 20%, and the pre-deformation due to the need for pressure during wearing is usually less than 30%, the inventors use the tensile force on the ribbon of 5 kgf and the force value of 40% deformation and elongation as the test data. Considering the possible strength loss of the film during punching and hot melt lamination, it is required that the elongation at break of the non-porous single film is greater than 150% and the breaking strength is greater than 2 kgf. Currently, many film suppliers in the industry have this type of hot melt film supply, such as Zheshibang, Baimeitie, Denais, etc.

[0022] (2) It is undeniable that a continuous non-porous film will affect the air permeability and elasticity of the area after bonding, and will also affect the sweat transfer during wearing. Therefore, in this application, the hot melt film is perforated, and the diameter of the hole is required to be 1mm to 5mm, preferably 2mm, the film opening rate is less than 85%, and there is no non-porous film area with a width of more than 1mm that penetrates the hot melt adhesive film b in the length direction of the elastic ribbon, so as to reduce the influence of the hot melt film on the opening in the length direction of the ribbon, and at the same time ensure the tensile strength under bonding; as shown in Figure 3.

[0023] (3) For customized membranes, the shapes of the openings can be diverse as shown in Figure 4.

[0024] (4) The hot melt adhesive film does not have any non-porous continuous film area with a width of more than 1 mm that runs through the width direction of the hot melt adhesive film;

[0025] (5) In order to further enhance the tensile strength, maintain air permeability and moisture permeability, and improve the elastic recovery of the contact area, an elastic mesh fabric is further added. The elastic mesh fabric is a thin elastic mesh fabric, preferably having a unit area weight GSM of less than 100, an opening greater than 200% under a constant force of 7.5 pounds, and an air permeability (ASTM D 737) greater than 40 CFM. The thin elastic mesh fabric is made of nylon spandex thin mesh fabric with a spandex content greater than 20%, preferably 30%. Or it is a polyester spandex thin mesh fabric with a spandex content greater than 20%, preferably 30%.

[0026] In this way, a ring-shaped seamless elastic webbing with good elasticity, breathability and aesthetics can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the seamless lamination process structure;

[0028] FIG2 is a process flow chart of a design and implementation method of a stretchable, breathable, counter-rotating ring-shaped webbing;

[0029] Figure 3 is a schematic diagram of the opening size of a typical high elastic film;

[0030] FIG4 is a schematic diagram showing the dimensions of a customized high elastic film opening;

[0031] FIG5 is a schematic diagram showing the welding direction of the upper and lower layers of elastic fabric;

[0032] FIG6 shows a schematic diagram of splicing a single layer of elastic fabric. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The specific embodiments described are only used to explain the present invention and are not intended to limit the present invention.

[0034] Example 1: Woven belt example

[0035] 1.1 Ribbon Preparation

[0036] A piece of webbing (item number T7B511 / 38 / FCT / YD) produced by Dongguan Runxin Elastic Fabric Co., Ltd. was selected. This webbing is a split webbing with a width of 38mm and a thickness of 1.61mm. Its loop length is 800mm and the split length is 112mm. The modulus of the webbing body and the upper and lower layers of elastic fabric were measured according to the standard ISO20932-1 method. They were stretched at a speed of 500mm / min on a Zwick tensile testing machine with a constant force of 5kgf. At 40% elongation, the modulus of the webbing body was 0.739kgf, the modulus of the upper layer of the split was 0.325kgf, and the modulus of the lower layer was 0.327kgf. The split layers are marked at both ends.

[0037] 1.2 Hot melt adhesive film preparation

[0038] Select Denais 1575-002 high-temperature, high-elastic hot melt adhesive film and make holes as shown in Figure 3. The hole diameter is 2.5mm, H1=3.5mm, H2=1.87mm, L1=1.87mm (C1 or C3)

[0039] 1.3 Preparation of hot melt components

[0040] Use the high-elastic mesh (item number: 1205281) produced by Chaoying Textile Co., Ltd., which is made of 74% nylon and 26% spandex.

[0041] ● Take the perforated hot melt adhesive film mentioned in 1.2 and cut it into 38mm strips according to the width of the ribbon (as adhesive film b) for later use

[0042] ● The entire piece of the porous hot melt adhesive film, the high elastic mesh and another entire piece of the porous hot melt adhesive film are attached to the upper and lower layers of the elastic mesh (the elastic mesh is selected as the reinforcing layer fabric c) by using a flat plate hot press at 120°C to form a hot melt assembly F (adhesive film b + reinforcing layer fabric c + adhesive film b); and further cut into 38mm wide for standby use.

[0043] 1.4 Ring blank strip preparation

[0044] ●Use ultrasonic welding to weld the selected webbing along the marked line to form a ring-shaped blank.

[0045] 2.1 Process Scheme 1: Single Membrane Scheme (C1):

[0046] ●Select a highly elastic hot-melt adhesive film as adhesive film b, cut a 40mm long piece of adhesive film, and place it in the middle of the opening of the ring-shaped blank split belt prepared in 1.4. Use a 145℃ flat-plate hot press to bond the upper and lower layers of the belt together to obtain an elastic and breathable ring-shaped elastic belt.

[0047] 2.2 Process Plan 2: Membrane + Mesh + Membrane Plan (Preparation of Hot Melt Component F):

[0048] ●Select hot melt component F, cut a 40mm long film, and place it in the center of the opening of the ring blank slit prepared in 1.4.

[0049] In the middle, the upper and lower layers of the webbing are bonded together by hot pressing at 145°C to obtain a resilient and breathable ring-shaped elastic webbing. The elasticity test of the webbing joints was carried out according to ISO 20932-1 standard and the results are summarized as follows.

[0050] From the data, we can see that the thickness of the finished product after lamination is increased by (1.66-1.61) / 1.61*100%=3.1% compared with the original belt body.

[0051] The opening is reduced from 138mm to 104mm, and the opening is reduced by (138-104) / 138*100%=24.6%

[0052] Example 2: Knitted belt example

[0053] Based on Example 1, a webbing (item number CL7917 / 64) produced by Dongguan Runxin Elastic Fabric Co., Ltd. was selected. This webbing is a mesh-and-solid hemming tape with a width of 64 mm, a folded width of 33 mm, and a thickness of 1.49 mm. The modulus of the webbing and the upper and lower elastic fabric layers were measured according to the ISO 20932-1 method. The webbing was stretched at a speed of 500 mm / min on a Zwick tensile testing machine with a constant force of 3.6 kgf. At 40% elongation, the modulus of the webbing was 0.776 kgf for the webbing, 0.335 kgf for the upper layer, and 0.327 kgf for the lower layer.

[0054] Referring to the process of Example 1, an adhesive film b with a width of 33 mm and an elastic breathable hot melt component (F) were prepared.

[0055] 2.1 Process plan - single film plan (adhesive film b):

[0056] ●Cut the selected edging tape to the required size and length according to the actual design requirements;

[0057] ●Align the ends of the cut edge tape, and use ultrasonic heat cutting and welding to form a preliminary ring edge tape;

[0058] ●Fold the edge tape in half to form a clip;

[0059] ●With the hot incision as the center, select the rolled adhesive film b (high-elastic hot-melt adhesive film), cut a 40mm length and place it in the clamp, and use a flat plate hot press at 145°C to bond the upper and lower layers of the ribbon together to form a ring-shaped clamping belt.

[0060] 2.2 Process Plan 2 Elastic Breathable Hot Melt Component Plan F:

[0061] ● Refer to Plan 1 and select the elastic breathable hot melt component F, cut a 40mm long piece of adhesive film, and place it in the center of the middle clamp of the preliminary circular edging belt. Use flat plate hot pressing at 145℃ to bond the upper and lower layers of the ribbon together to form a circular clamping belt.

[0062] The test data of knitted ring webbing is summarized as follows:

[0063] From the data, we can see that the thickness of the finished product after lamination is increased by (1.54-1.49) / 1.49*100%=3.4% compared with the original belt body without lamination.

[0064] The opening is reduced from 109mm to 79mm, and the opening is reduced by (109-79) / 109*100%=27.5%

[0065] From the two examples above, we can see that after seamless lamination, both woven and knitted belts maintain significant elasticity under loads of 5kgf and 3.6kgf, respectively, as per product standards. Compared to the unlaminated belt, the belt retains at least 70% of its pre-processing elasticity. The perforated design also meets moisture and breathability requirements.

[0066] Although the preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all fall within the scope of protection of the present invention.

Claims

1. An endless webbing, comprising a belt body and a connecting part, characterized in that: The belt body has two ends A and B, and the two ends are respectively divided into an A-end upper layer (Au) and an A-end lower layer (Al) of the same length (L1) and an B-end upper layer (Bu) and a B-end lower layer (Bl) of the same length; The connection part includes: (a) The upper fabric (a) is formed by joining the upper fabric at the A end (Au) and the upper fabric at the B end (Bu). (b) at least one adhesive film (b), (c) a reinforcement fabric (c), and (d) a lower fabric (d), which is formed by butting the lower fabric at the A end (A1) and the lower fabric at the B end (B1); and The various layers at the connection part are bonded into one by an adhesive film, and form an annular webbing with the belt body.

2. The endless webbing according to claim 1, characterized in that: The annular webbing is a seamless annular elastic webbing formed by seamless hot-melt bonding and / or ultrasonic welding of a straight open-loop elastic webbing. The adhesive film is a hot-melt adhesive film, preferably a high-elastic hot-melt adhesive film.

3. The endless webbing according to claim 1, characterized in that: The elastic moduli (K1, K2, K3) of the elastic webbing body and the upper and lower elastic fabrics at the connection end are measured respectively, and the connection length (L1) is greater than 0.5 cm, preferably 4 or 5 cm.

4. The endless webbing according to claim 1, characterized in that: The elastic breathable hot melt component (F) is composed of at least one layer of adhesive film (b), preferably a high elastic hot melt adhesive film, which can be further compounded with the reinforcing layer fabric (c) and the adhesive film (b) to form the elastic breathable hot melt component (F), and its width is the same as or less than the width of the processed ribbon, the length is greater than 2 cm and less than 2 times the length (L1) - 0.5 mm, the elastic modulus K4 is less than the minimum elastic modulus min (K1, K2, K3), and the tensile strength at break is greater than 2 kgf; The reinforcing layer fabric is an elastic mesh fabric.

5. The endless webbing according to claim 1 or 3, characterized in that: The adhesive film (b) is perforated to improve air permeability and moisture permeability and further improve the elasticity of the weld, wherein the opening rate is less than 85%, and there is no non-porous continuous film area with a width of more than 1 mm that passes through the adhesive film (b) in the direction consistent with the length direction of the ribbon.

6. The endless webbing according to any one of claims 1, 3 and 4, characterized in that: The adhesive film (b) does not have any non-porous continuous film region having a width of 1 mm or more and penetrating the width direction of the adhesive film (b).

7. The endless webbing according to claim 1 or 4, characterized in that: The elastic fabric is a thin elastic mesh fabric, preferably with a grammage per unit area GSM less than 100, an openness greater than 200% under a constant force of 7.5 pounds, and an air permeability (ASTM D 737) greater than 40 CFM.

8. The endless webbing according to any one of claims 1, 4 and 7, characterized in that: The thin elastic mesh is a nylon spandex thin mesh, and the spandex content is greater than 20%, preferably 30%.

9. The endless webbing according to any one of claims 1, 4 and 7, characterized in that: The thin elastic mesh is a polyester-spandex thin mesh with a spandex content greater than 20%, preferably 30%.

10. A method for forming an endless webbing, comprising the following steps: (i) providing a long strip of webbing, which comprises a plurality of layered portions, wherein the layered portions are separated into an upper and a lower layer of webbing structure; (ii) cutting the long ribbon at each layering position to form a plurality of ribbon segments with two ends being layered into upper and lower layers; (iii) bending the ribbon segment so that the two ends are butted together to form a two-layer structure separated in the middle; (iv) placing at least one layer of adhesive film (b) and a reinforcing layer of fabric (c) into a two-layer structure separated in the middle formed by butting the two ends of the ribbon; (v) performing heat-compression welding to bond the separated two-layer structure and the adhesive film (b) and the reinforcing layer fabric (c) inserted therein into one body, thereby forming an endless webbing.

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