Warp-wise elastic non-woven fabric and manufacturing equipment thereof

Abstract

The utility model discloses warp-wise elastic non-woven fabric and manufacturing equipment thereof. The warp-wise elastic non-woven fabric comprises a heating device, a needle clip chain, a feeding wheel set and a brush wheel. During operation, a speed difference gear of the feeding wheel set feeds a non-woven fabric between the speed difference gear and the air suction gear in an overfeeding mode to form wavy wrinkles, air suction holes of the air suction gear provide suction force so that the two sides of the non-woven fabric can be tightly attached to the outer surface of the air suction gear, and a thorn of the needle clip chain pierces the non-woven fabric to fix the wavy wrinkles. The brush wheel flattens the wave wrinkles; in the heating device, the non-woven fabric is heated to be softened in the preheating section, stretched and oriented in the weft direction in the expanding section, meanwhile, the wave wrinkles are leveled, stabilized in the stabilizing section, and then cooled and shaped, so that the warp-direction elastic non-woven fabric is formed. Uniform wave wrinkles are formed on the non-woven fabric in advance, and the air suction device is matched, so that the phenomenon that the area of the non-woven fabric is reduced or the thickness of the non-woven fabric is reduced due to necking during subsequent stretching can be compensated, and the non-uniform condition of a traditional overfeeding mode is improved.

Description

Technical Field

[0001] The utility model relates to a warp elastic non-woven fabric and a manufacturing method thereof, in particular to a warp elastic non-woven fabric which first forms wave wrinkles, then changes the fiber directionality of the non-woven fabric and endows elasticity through heat softening, weft stretching and cooling setting, and at the same time flattens the wave wrinkles, and a manufacturing method thereof. Background Art

[0002] For general sanitary products, such as masks, disposable underwear, baby diapers or adult diapers, or sports protective bandages, medical bandages, etc., when considering hygiene and use safety, disposable forms are usually adopted to avoid being contaminated by germs or harmful substances. Since these products will be in contact with the skin for a period of time, the requirement for air permeability is relatively strict to prevent discomfort, skin allergy, itching or even rash caused by sultriness or dampness.

[0003] Since the non-woven fabric made of plasticized material has the advantages of easy manufacturing, processing, good chemical resistance, durability and low cost, it has been widely used in many sanitary products. However, the non-woven fabric has poor extensibility, insufficient comfort and covering performance, which will cause inconvenience in use for wearable applications, such as diapers. Therefore, manufacturers have developed a composite non-woven fabric that can improve extensibility, which can be called an elastic composite non-woven fabric. In the manufacturing process of the existing elastic composite non-woven fabric, a common method is to pre-stretch an elastic material as an intermediate layer, and then use two non-elastic ordinary non-woven fabrics as the upper layer and the lower layer respectively, and bond them in a sandwich manner, and then stop applying the external force for stretching after bonding so as to form wave wrinkles on the upper and lower surfaces of the elastic composite non-woven fabric; another common method is to use an elastic material as an intermediate layer without stretching, and then use two non-elastic ordinary non-woven fabrics as the upper layer and the lower layer respectively, and bond them in a sandwich manner to form a flat three-layer structure. After bonding, the material surface of the ordinary non-woven fabric is damaged, such as activation, to make the ordinary non-woven fabric slightly extensible.

[0004] However, bonding not only increases the manufacturing steps, but also makes the non-woven fabric product thick and heavy, resulting in poor user comfort, and increases the space and cost required for storage and transportation. Moreover, the product may show a peeling phenomenon due to incomplete bonding. In addition, if an adhesive is used for bonding, it is also easy to show a peeling phenomenon due to uneven distribution of the adhesive.

[0005] Another existing technology uses elastomers as raw materials to manufacture single-layer elastic non-woven fabrics through non-woven processes such as meltblowing or spunbonding. However, the cost is high. Therefore, the present utility model hopes to develop an elastic non-woven fabric that imparts elasticity to the single-layer non-woven fabric only through the thermoplastic characteristics of man-made fibers, thus having the advantage of significantly reducing costs.

[0006] In existing non-woven fabric manufacturing methods, in addition to the spunbonding method, there are also other methods such as hydroentangling, needling, and heat melting. The spunbonding method extrudes the raw material melted from the nozzle through an extrusion device, stretches and cools it through an air duct to form ultrafine fibers, and blows them onto a collecting net to form a net-like structure. The long fibers of the disordered net-like structure pass through a heated hot roller, thereby thermally pressing and adhering them on the fiber layer.

[0007] Due to the thermoplasticity of the plasticized material non-woven fabric (the characteristic of softening when heated and hardening after cooling) and the dispersed and non-directional nature of the fiber structure of ordinary non-woven fabrics (as shown in Figure 1a, the fiber structure 11 of the non-woven fabric is randomly oriented), hot air can be used to penetrate the fiber structure to heat the fibers to the corresponding softening temperature, and while heating and softening, mechanically continuous weftwise stretching is performed on the dispersed fibers to change the fiber structure's directionality (the non-woven fabric in Figure 1a is stretched along the weft direction so that the fiber structure 11 is oriented along the weft direction as shown in Figure 1b, and at the same time, the non-woven fabric neck contracts along the warp direction).

[0008] Since the fiber direction in the fiber structure 11 of the non-woven fabric provides the source of elasticity, after cooling, the elastic non-woven fabric that has been heated and softened and weftwise stretched has a fiber structure that forms the shape of a telescopic robotic arm as shown in Figure 1b. Among them, when a warp tensile force is applied, the fiber structure 11 of the non-woven fabric oriented along the weft direction (as shown in Figure 1b) can be stretched back along the warp direction to the state where the fiber directionality has not been changed (as shown in Figure 1a), so it has warp extensibility; and after the warp tensile force is stopped, the fiber structure 11 of the elastic non-woven fabric will return to the state oriented along the weft direction again (as shown in Figure 1b), so it has warp recovery; that is to say, such elastic non-woven fabrics have warp telescopic and recoverable elasticity.

[0009] On the other hand, Figures 2a and 2b respectively show the microscopic images of ordinary hydroentangled non-woven fabrics before and after weftwise stretching, in which the state of the non-woven fabric fiber structure oriented along the weft direction after stretching can also be observed.

[0010] In addition, after the non-woven fabric is mechanically weftwise stretched, it will undergo necking deformation (such as Figure 3in the necking region N), and due to the Poisson's ratio, the warp area of the non-woven material is reduced. Therefore, by pre-overfeeding the non-woven fabric along the warp direction (i.e., the fabric feeding speed is greater than the running speed of the needle bar chain), the non-woven fabric can be formed into a wavy state to reduce the warp tension of the fabric, thereby compensating for the above-mentioned necking phenomenon and preventing the non-woven fabric from becoming too thin due to the necking phenomenon after stretching, which is beneficial to the weft width expansion.

[0011] However, the traditional overfeeding method solely based on the speed difference will cause the non-woven fabric to have uneven wavy wrinkles, and then lead to the problem of uneven fabric surface after the weft width expansion. Therefore, an improved method for manufacturing elastic non-woven fabric is needed. Summary of the Utility Model

[0012] In view of the problems encountered in the prior art, the present utility model aims to provide a method for manufacturing warp elastic non-woven fabric. By pre-forming uniform wavy wrinkles on the non-woven fabric and matching with a suction device, it can compensate for the area reduction or thickness thinning of the non-woven fabric caused by necking during subsequent stretching, thereby improving the unevenness of the traditional overfeeding method; and a single-layer elastic non-woven fabric manufactured by the above method, which has strong elastic resilience in the warp direction and a flat surface, so it can be directly used for products without being laminated with another elastic substrate, thus greatly improving the production rate, enhancing the user's comfort, and reducing the space and cost of storage and transportation.

[0013] To solve the above problems, the present utility model provides a manufacturing device for elastic non-woven fabric, including:

[0014] A heating device, which sequentially has an inlet, an internal space, and an outlet along the warp direction. The internal space is divided into a preheating section adjacent to the inlet, an expansion section in the middle, and a stabilization section adjacent to the outlet along the warp direction;

[0015] At least two needle bar chains in the form of conveyor belts, respectively located on the weft direction sides of the heating device, and extending from the inlet of the heating device along the warp direction through the preheating section, the expansion section, and the stabilization section to the outlet. Each of these needle bar chains is provided with a plurality of barbs;

[0016] At least two sets of feeding wheel groups, respectively arranged above these needle bar chains at the inlet of the heating device; and

[0017] At least two brush wheels, respectively arranged above these needle bar chains downstream of these feeding wheel groups in the warp direction; wherein

[0018] Each of these feeding wheel groups includes a speed difference gear and a suction gear that mesh with each other, wherein

[0019] Each of the differential gears is provided with a plurality of first tooth portions and a plurality of first groove portions, which are arranged alternately along the outer circumferential surface of the differential gear, and

[0020] A hollow groove is provided at the circumferential center of the outer surface of each of the suction gears. Moreover, each of the suction gears is provided with a plurality of second tooth portions, a plurality of second groove portions, and a plurality of suction holes respectively on both circumferential sides of the hollow groove. Among them, the second groove portions and the second tooth portions are arranged alternately on both circumferential sides of the outer circumferential surface of the suction gear. And the suction holes are provided at least on the second groove portions. Among them

[0021] The differential gears feed the two circumferential sides of a non-woven fabric along the warp direction into the space between the differential gears and the suction gears at a speed higher than the conveying speed of the needle clip chain. Among them, the differential gears and the suction gears rotate meshingly with each other in such a way that the first tooth portions are inserted into the second groove portions and the second tooth portions are inserted into the first groove portions, so that the two circumferential sides of the non-woven fabric are respectively caught between the first tooth portions and the second groove portions and between the first groove portions and the second tooth portions, thereby forming regular wavy wrinkles in the non-woven fabric along the warp direction. The suction gears provide a suction force through the suction holes so that the two circumferential sides of the fed non-woven fabric are respectively closely attached to the outer surfaces of the second tooth portions and the second groove portions. And the hollow grooves are configured to enable the barbs to respectively pierce into the fed non-woven fabric and enter the hollow grooves when the needle clip chain runs in a conveyor belt manner while rotating on the suction gears, so as to fix the wavy wrinkles of the fed non-woven fabric. And the suction gears stop providing the suction force after the barbs pierce into the fed non-woven fabric, so that the non-woven fabric can be smoothly transferred from the suction gears to the needle clip chain;

[0022] The brush wheels rotate while the needle clip chain runs in a conveyor belt manner to flatten the wavy wrinkles of the non-woven fabric on the needle clip chain; And

[0023] The needle clip chain feeds the non-woven fabric with flattened wavy wrinkles from the entrance of the heating device into the internal space of the heating device along the warp direction. Among them

[0024] In the preheating section, the needle clip chain conveys the non-woven fabric along the warp direction while maintaining a fixed circumferential pitch, and at the same time the heating device heats the non-woven fabric to soften it.

[0025] Subsequently, in this width-expanding section, while the heating device continuously heats, these needle bar chains convey the softened non-woven fabric in the warp direction with the weft spacing gradually widening to stretch it in the weft direction, causing the non-woven fabric to undergo necking compensation in the warp direction to flatten the wave wrinkles that extend in the warp direction and are flattened, and at the same time orient the fiber structure of the non-woven fabric in the weft direction, so that the non-woven fabric presents a flat shape and has an extension recovery force in the warp direction.

[0026] Then, in this stabilization section, while the heating device continuously heats, these needle bar chains convey the softened and stretched non-woven fabric in the warp direction while maintaining the widened weft spacing to stabilize it.

[0027] Finally, these needle bar chains send the stabilized non-woven fabric out of the heating device from the outlet to cool and shape the stabilized non-woven fabric, thereby forming a warp elastic non-woven fabric.

[0028] In an embodiment of the present invention, these air suction holes are further provided on these second tooth parts. In an embodiment of the present invention, the heating temperature of the heating device is 120 to 180 °C, preferably 130 to 150 °C.

[0029] In an embodiment of the present invention, the weft width expansion ratio of the non-woven fabric in this width-expanding section is between 15 and 100%.

[0030] In an embodiment of the present invention, each thorn needle on these needle bar chains respectively aligns with the wave crest and / or wave trough of the wave wrinkles.

[0031] In an embodiment of the present invention, the spacing between these first tooth parts: the spacing between these second tooth parts: the spacing between these thorn needles is 1:1:1 or 1:1:0.5.

[0032] In an embodiment of the present invention, the non-woven fabric is made by spunbonding, hydroentangling, heat bonding, meltblowing, or needling.

[0033] In an embodiment of the present invention, the non-woven fabric is made of a material selected from the group consisting of PP, PE, PET, PP / PE, PP / PET, or a combination thereof.

[0034] To solve the above problems, the present invention also provides a warp elastic non-woven fabric, wherein the warp elastic non-woven fabric has a flat surface, and its fiber structure is basically oriented in the weft direction, so that the warp elastic non-woven fabric has an extension recovery force in the warp direction.

[0035] In an embodiment of the present invention, the warp elongation rate of the warp elastic non-woven fabric is between 50 and 350%.

[0036] The functions of the present utility model are as follows. First, by feeding the non-woven fabric through the differential gears and the suction gear that mesh with each other, regular wave wrinkles can be formed on the non-woven fabric, which is beneficial to ensuring the surface flatness of the final elastic non-woven fabric. Second, by the suction force on the suction gear, the non-woven fabric is closely attached to the outer surfaces of the teeth and grooves of the suction gear, and the wave wrinkles of the non-woven fabric can be transferred to the subsequent process while maintaining their original state, which is beneficial to improving the final fabric uniformity. Third, by providing a hollow groove in the center of the outer surface of the suction gear, a accommodation space can be provided for the needles on the needle chain after they penetrate the non-woven fabric. Fourth, by slightly stretching the non-woven fabric in the weft direction under heating to change the fiber orientation and then cooling and shaping, the non-woven fabric can have better elasticity in the warp direction than the prior art. Fifth, by pre-forming uniform wave wrinkles, it is possible to compensate for the phenomenon of area reduction or thickness thinning of the non-woven fabric caused by necking during subsequent stretching. Sixth, by making the single-layer non-woven fabric have excellent elasticity after processing, additional bonding materials or bonding steps can be omitted, thereby reducing the manufacturing cost, thinning the product to improve user comfort, and reducing the space and cost required for storage and transportation.

[0037] The effects of the present utility model are not limited to the above effects, and those skilled in the art can clearly understand other effects not mentioned from the description of the claims. Description of the Drawings

[0038] Figures 1a and 1b respectively show images of a common spunbond non-woven fabric before and after weft direction stretching (taken by a handheld low-noise high-definition digital microscope).

[0039] Figures 2a and 2b respectively show images of a common hydroentangled non-woven fabric before and after weft direction stretching (taken by a handheld low-noise high-definition digital microscope).

[0040] Figure 3 A perspective view showing the manufacturing equipment for the warp direction elastic non-woven fabric of the present utility model.

[0041] Figure 4 A schematic diagram showing the needles entering the hollow groove in the manufacturing equipment of the present utility model, where the non-woven fabric is not shown.

[0042] Figure 5a A schematic diagram showing that the wave wrinkles generated only by the differential wheel with a flat surface in a prior art setting machine are flattened by a brush wheel.

[0043] Figure 5b Showing the differential wheel of a prior art setting machine.

[0044] Figure 6a A schematic diagram showing the uneven wave wrinkles generated by a prior art setting machine.

[0045] Figure 6b Schematic diagram showing the uneven wavy wrinkles generated by a stenter in the prior art after being flattened by a brush wheel;

[0046] Figure 7 Schematic diagram showing the wavy wrinkles generated by a feeding wheel set including a differential gear and an air suction gear in the form of a gear in the manufacturing equipment of the present invention after being flattened by a brush wheel;

[0047] Figure 8a Schematic diagram showing the uniform wavy wrinkles generated by the manufacturing equipment of the present invention;

[0048] Figure 8b Schematic diagram showing the uniform wavy wrinkles generated by the manufacturing equipment of the present invention after being flattened by a brush wheel;

[0049] Figure 9a Picture showing the final fabric produced by using a stenter in the prior art;

[0050] Figure 9b Picture showing the final non-woven fabric produced by using the manufacturing equipment of the present invention;

[0051] Figure 10 Flow chart showing the manufacturing method of the warp elastic non-woven fabric of the present invention;

[0052] Figure 11 Schematic diagram showing the appearance of the warp elastic non-woven fabric of the present invention; and

[0053] Figure 12 Showing Figure 11 Partial enlarged view of area a.

[0054] Explanation of reference numerals in the drawings:

[0055] a: Area

[0056] 10: Non-woven fabric

[0057] 11: Fiber structure

[0058] 20: Differential gear

[0059] 20’: Differential wheel in the prior art

[0060] 20a’: Friction surface

[0061] 20b’: Brush

[0062] 21: First tooth part

[0063] 22: First groove part

[0064] 30: Air suction gear

[0065] 31: Second tooth part

[0066] 32: Second groove portion

[0067] 33: Suction hole

[0068] 34: Hollow groove

[0069] 40, 40’: Needle clip chain

[0070] 41, 41’: Lancing needle

[0071] 50, 50’: Brush wheel

[0072] 60: Heating device

[0073] 61: Inlet

[0074] 62: Internal space

[0075] 62a: Preheating section

[0076] 62b: Width expanding section

[0077] 62c: Stabilization section

[0078] 63: Outlet

[0079] 100: Radially elastic non-woven fabric 110: Fiber structure B’: Pulley set

[0080] F: Feeding wheel set

[0081] N: Necking region

[0082] MD: Radial direction

[0083] TD: Transverse direction

[0084] S10: Feeding step

[0085] S20: Wave forming step S30: Fixing step

[0086] S40: Flattening step

[0087] S50: Preheating step

[0088] S60: Width expanding step

[0089] S70: Stabilization step

[0090] S80: Cooling step Detailed implementation manners

[0091] Advantages and features of the present utility model and the method for realizing the same will be more clearly understood according to the embodiments described below with reference to the accompanying drawings. However, the present utility model is not limited to the following embodiments, but can be implemented in various different forms.

[0092] Without conflict, the technical features in any embodiment of the present utility model can be combined with those in other embodiments of the present utility model.

[0093] In this text, "machine direction (MD)" refers to the direction parallel to the direction in which the non-woven fabric is conveyed by the manufacturing equipment, also known as the longitudinal direction; while "transverse direction (TD)" refers to the direction perpendicular to the direction in which the non-woven fabric is conveyed by the manufacturing equipment.

[0094] In this text, "broaden ratio" refers to the ratio of the final elongation of a material (such as the raw non-woven fabric) stretched from its original width during the broadening stage to the original width of the material.

[0095] In this text, "elongation" refers to the ratio of the maximum elongation of a material (such as the machine-direction elastic non-woven fabric) stretched from its natural width to the natural width of the material.

[0096] Referring to Figure 3 , the present utility model provides a manufacturing equipment for machine-direction elastic non-woven fabric, including: a heating device 60, a needle chain 40 in the form of a conveyor belt, a feeding wheel set F, and a brush wheel 50.

[0097] The heating device 60 sequentially has an inlet 61, an internal space 62, and an outlet 63 along the machine direction. Among them, the internal space 62 is divided into along the machine direction: a preheating section 62a adjacent to the inlet 61, an expanding section 62b in the middle, and a stabilizing section 62c adjacent to the outlet 63.

[0098] In the present utility model, the non-woven fabric can be softened by heat using the heating device 60 for processing and shaping. The heating device 60 is, for example but not limited to, an oven. The internal space 62 of the heating device 60 is the actually heated space, and the inlet 61 and outlet 63 of the heating device 60 can be designed to be heated or not heated according to requirements.

[0099] Since non-woven fabrics 10 with different compositions have different softening points, the heating temperature of the heating device 60 can be between 120 and 180 °C, preferably between 130 and 150 °C.

[0100] The number of the needle chains 40 is configured to be at least two, respectively located on both sides in the transverse direction of the heating device 60, and extend from the inlet 61 of the heating device 60 along the machine direction through the preheating section 62a, the expanding section 62b, and the stabilizing section 62c to the outlet 63. A plurality of barbs 41 are provided on each needle chain 40.

[0101] Referring to Figure 3, the number of the feeding wheel sets F is configured to be at least two groups, and they are respectively arranged above the needle gripper chains 40 on both sides at the inlet 63 of the heating device 60.

[0102] Each feeding wheel set F includes a differential gear 20 and a suction gear 30 that mesh with each other.

[0103] Each differential gear 20 is provided with a plurality of first tooth parts 21 and a plurality of first groove parts 22, which are arranged alternately along the outer circumferential surface of the differential gear 20.

[0104] Refer to Figure 4 , at the circumferential center of the outer surface of each suction gear 30, a hollow groove 34 is provided; and, on both circumferential sides of the hollow groove 34 of each suction gear 30, a plurality of second tooth parts 31, a plurality of second groove parts 32, and a plurality of suction holes 33 are respectively provided, wherein, the second groove parts 32 and the second tooth parts 31 are respectively arranged alternately on both circumferential sides of the outer circumferential surface of the suction gear 30, and the suction holes 33 are at least provided on the second groove parts 32.

[0105] Refer to Figure 3 , the number of the brush wheels 50 is configured to be at least two, and they are respectively arranged above the respective needle gripper chains 40 at the downstream in the longitudinal direction of each feeding wheel set F.

[0106] In the manufacturing equipment of the present utility model, the needle gripper chains 40, the feeding wheel sets F, and the brush wheels 50 are preferably configured to be symmetrically arranged with each other on both circumferential sides of the heating device 60, so as to facilitate the smooth transportation of the non-woven fabric and avoid phenomena such as pulling or unevenness during the processing of the non-woven fabric.

[0107] In addition, although the description in the specification of the present utility model takes the configuration of two needle gripper chains 40, two feeding wheel sets F, and two brush wheels 50 as an example, however, those skilled in the art can understand that depending on the product requirements and depending on the trade-off between the equipment cost and the processing precision, additional needle gripper chains 40, feeding wheel sets F, and brush wheels 50 can be appropriately added between the above-mentioned elements.

[0108] In the present utility model, an ordinary non-woven fabric 10 is processed by using the manufacturing equipment for the warp elastic non-woven fabric, so that after heat softening, circumferential stretching, and cooling and shaping, the fiber directionality is changed and oriented along the circumferential direction, thereby being given warp elasticity.

[0109] Preferably, the non-woven fabric 10 includes, but is not limited to, non-woven fabrics made by spunbonding, hydroentangling, heat bonding, meltblowing, or needling methods.

[0110] To meet the heating softening and cooling shaping characteristics required by the manufacturing process, the non-woven fabric 10 used in the present utility model is made of thermoplastic materials, such as polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), bicomponent PP / PE, bicomponent PP / PET, or a combination thereof, but not limited thereto.

[0111] The following describes the operation mode of the manufacturing equipment for the warp elastic non-woven fabric of the present utility model.

[0112] First, the differential gears 20 feed the two weft sides of the non-woven fabric 10 along the warp direction into the spaces between each group of differential gears 20 and suction gears 30 at a conveying speed higher than that of the needle bar chain 40 (i.e., in an overfeed manner). Among them, each group of differential gears 20 and suction gears 30 are meshed and rotated with the first tooth part 21 inserted into the second groove part 32 and the second tooth part 31 inserted into the first groove part 22, so that the two weft sides of the non-woven fabric 10 are respectively trapped between the first tooth part 21 and the second groove part 32 and between the first groove part 22 and the second tooth part 32, thereby forming regular wave wrinkles on the non-woven fabric 10 along the warp direction.

[0113] Next, the suction gear 30 provides a suction force through the suction holes 33 provided at least on the second groove part 32, so that the two weft sides of the fed non-woven fabric 10 are respectively closely attached to the outer surfaces of the second tooth part 31 and the second groove part 32.

[0114] Preferably, in order to enhance the effect of closely attaching the non-woven fabric 10 to the outer surfaces of the second tooth part 31 and the second groove part 32 of the suction gear 30, suction holes 33 can also be further provided on the second tooth part 31.

[0115] Subsequently, the hollow groove 34 of the suction gear 30 is configured such that the needles 41 of the needle bar chain 40 penetrate into the fed non-woven fabric 10 and enter the hollow groove 34 while the needle bar chain 40 rotates on the suction gear 30 in a conveyor belt manner, so as to fix the wave wrinkles of the fed non-woven fabric 10.

[0116] Moreover, after the needles 41 penetrate into the fed non-woven fabric 10, the suction gear 30 stops providing the suction force, so that the non-woven fabric 10 can be smoothly transferred from the suction gear 30 to the needle bar chain 40.

[0117] Next, the brush wheel 50 rotates while the needle bar chain 40 rotates in a conveyor belt manner to flatten the wave wrinkles of the non-woven fabric 10 on the needle bar chain 40. Among them, for smooth processing, the height of the brush wheel 50 is set such that when the brush wheel rotates above the needle bar chain 40, the wave wrinkles of the non-woven fabric 10 fixed on the needle bar chain 40 can be flattened.

[0118] In addition, in order to flatten the wavy wrinkles of the non-woven fabric 10 before stretching and width expanding the non-woven fabric 10 (described later), the specific position of the brush wheel 50 can be set within the range from the downstream in the warp direction of the feeding wheel group F to the softening section 62a of the heating device 60.

[0119] In the prior art, since the fabric will shrink after being dyed with high-temperature water, a stenter is used to expand the width of the fabric during the high-temperature drying process to compensate for the shrinkage and shape it, so that the fabric width is consistent, and the straight arrangement of the warp and weft yarns is stabilized. The handle of the fabric can also be adjusted. The overfeed technology can be used to more subtly adjust the arrangement of the warp and weft yarns during width expansion.

[0120] The above prior art is applied to fabrics with warp and weft yarn arrangements. In the fabric width expansion and shaping process using the overfeed technology, the conditions and adjustable ranges such as the denier size (tensile strength) of the fabric, the arrangement of warp and weft yarns (tensile strength of the tissue arrangement), and the weave count (tensile strength of the density) have been fixed and cannot be adjusted more significantly.

[0121] During the development of the present utility model, when applying the stenter and overfeed technology of the above prior art to non-woven fabrics, it is found that, different from fabrics with warp and weft yarn arrangements, due to the random arrangement of non-woven fabric fibers, the width expansion and shaping and overfeed tightening effects can be more prominent. However, the overfeed technology applied in the above prior art lacks the design of gears and suction devices, which will affect the uniformity of non-woven fabrics (as Figure 9a shown).

[0122] In the present utility model, through the improved design of the differential gear 20 and the suction gear 30, the non-woven fabric 10 can be formed into uniform wavy wrinkles and transferred to the needle chain while maintaining the original state, avoiding the problems of uneven wavy wrinkles caused by the overfeed of the fabric in a simple differential manner in the width expansion and shaping process of the prior art, and the problem of uneven final fabric thickness after width expansion in the weft direction.

[0123] As Figures 5a to 5b shown, in the fabric stenter of the prior art, there is only a configuration of the differential wheel 20' and the brush wheel 50', and there is no suction gear. Among them, the belt wheel group B' and the differential wheel 20' overfeed and squeeze the non-woven fabric 10' into the space between the differential wheel 20' and the brush wheel 50'. Since the feeding speed of the belt wheel group B' and the differential wheel 20' is greater than the conveying speed of the needle chain 40', an overfeed speed difference is formed. The non-woven fabric 10' is clamped by the belt wheel group B' and the differential wheel 20' to cause a differential push, thereby forming wavy wrinkles. Then, the brush wheel 50' presses the non-woven fabric 10' into the needle chain 40'. Preferably, as Figure 5bAs shown, the differential wheel 20' has a friction surface 20a' on one side of its circumferential surface and a brush 20b' on the other side. The brush 20b' on the differential wheel 20' can also press the non-woven fabric 10' into the needle chain 40'.

[0124] However, since the surface of the differential wheel 20' of the prior art is flat and has no teeth, it can only provide frictional force with the non-woven fabric 10' through the friction surface (made of rubber material for example).

[0125] Thus, this configuration will make the wavy wrinkles of the non-woven fabric irregular, and further cause the problem of uneven fabric surface after weft stretching. Specifically, while the differential wheel 20' rotates, the needles 41' on the needle chain 40' pierce and fix the irregular wavy wrinkles of the non-woven fabric 10' (as Figure 6a shown), and after the brush wheel 50' further flattens the wavy wrinkles, only the non-woven fabric 10' with an uneven flattened wavy wrinkle appearance can be obtained (as Figure 6b shown), so uniform stretching cannot be achieved in the subsequent process, resulting in the problem of uneven final fabric surface.

[0126] Referring to Figures 7 to 8b , the manufacturing equipment of the present utility model is different from that of the prior art in that the present utility model replaces the flat differential wheel 20' of the prior art with a differential gear 20 in the form of a gear, and further includes a suction gear 30.

[0127] As the differential gear 20 and the suction gear 30 mesh and rotate, the non-woven fabric 10 will get stuck between the teeth and grooves of the differential gear 20 and the suction gear 30, so that the non-woven fabric 10 forms regular wavy wrinkles along the warp direction.

[0128] Thereafter, since suction holes 33 are provided on the surface of the suction gear 30, the suction force through the suction holes 33 makes the non-woven fabric 10 closely adhere to the outer surfaces of the second teeth 31 and the second grooves 32 of the suction gear 30, so that the wavy wrinkles of the non-woven fabric 10 can be temporarily fixed by the suction force, and the wavy wrinkles of the non-woven fabric 10 can be transferred to the subsequent process while keeping the original appearance, which is beneficial to the subsequent fixation by the needle chain 40 to avoid the displacement of the non-woven fabric 10 in the subsequent process, thereby improving the surface uniformity of the final non-woven fabric.

[0129] After that, as the suction gear 30 rotates, the wavy wrinkles of the non-woven fabric 10 move above the needle chain 40, and as the needle chain 40 operates in the manner of a conveyor belt, the needles 41 on the needle chain 40 pierce and fix the regular wavy wrinkles of the non-woven fabric 10 (as Figure 8a shown), and then, after the brush wheel 50 further flattens the wavy wrinkles, the non-woven fabric 10 with a uniform flattened wavy wrinkle appearance can be obtained (as Figure 8bAs shown, uniform width expansion can be achieved in subsequent processes, thereby manufacturing a warp elastic non-woven fabric with a uniform fabric surface.

[0130] Figure 9a and Figure 9b respectively show pictures of the final fabric produced by the manufacturing equipment of the prior art and the final non-woven fabric produced by the manufacturing equipment of the present invention. Among them, in the case of using the differential wheel 20' of the prior art, uneven wrinkles exist on the surface of the final fabric, while in the case of using the differential gear 20 and the suction gear 30 of the present invention, the final non-woven fabric has a flat surface appearance.

[0131] Preferably, the spacing or arrangement density between the barbs 41 on the needle bar chain 40 can be adjusted to increase the fixing degree of the needle bar chain 40 to the non-woven fabric 10.

[0132] Preferably, multiple groups of needle bar chains 40 can be provided, and the number of teeth and the barb spacing can be adjusted according to the elastic extension requirements.

[0133] Preferably, the differential gear 20 and the suction gear 30 can be designed to have the same diameter and the same number of teeth, so the speed ratio of the differential gear 20 to the suction gear 30 can be 1:1.

[0134] Preferably, compared with the manufacturing equipment of the warp elastic non-woven fabric of the prior art, the number of teeth of the differential gear 20 and the suction gear 30 can be increased or decreased and replaced with modules, and the number and height of the tooth grooves can also be matched with the needle bar chain 40.

[0135] Preferably, the manufacturing equipment of the present invention can be designed so that each barb 41 respectively aligns with the peak and / or trough of the wave wrinkles of the non-woven fabric 10 (as Figure 8a shown), thereby being able to better fix the wave wrinkles in subsequent processes.

[0136] Preferably, the spacing between the first tooth portions 21: the spacing between the second tooth portions 31: the spacing between the barbs 41 can be designed to be 1:1:1, so that each barb 41 can respectively align with each peak or each trough of the wave wrinkles of the non-woven fabric 10.

[0137] Or, in a more preferred embodiment, the spacing between the first tooth portions 21: the spacing between the second tooth portions 31: the spacing between the barbs 41 can be designed to be 1:1:0.5, so that each barb 41 can respectively align with each peak and each trough of the wave wrinkles of the non-woven fabric 10 (as Figure 8a shown).

[0138] Preferably, in the manufacturing equipment of the present utility model, by adjusting the height and width of the first tooth part 21 and the second tooth part 31, the width of the first groove part 22 and the second groove part 32, and the distance between the differential gear 20 and the suction gear 30, the height or width of the wave wrinkles of the non-woven fabric 10 can be adjusted, that is, the shape of the wave wrinkles of the non-woven fabric 10 can be changed.

[0139] By changing the shape of the wave wrinkles of the non-woven fabric, the thickness, warp elasticity and uniformity of the final warp elastic non-woven fabric can be adjusted.

[0140] The height or width of the wave wrinkles and the distance between the two wheels have an absolute relationship with the uniformity of the fabric surface. For example, when the number of teeth and the pitch of the gears are fixed: if the weft width is widened, the distance between the two wheels is close (the wave wrinkles are high), there is enough fiber to stretch to both sides, the fabric becomes slightly thicker, the shrinkage is large, and the warp elasticity is good; if the weft width is narrowed, the distance between the two wheels is wide (the wave wrinkles are low), the shrinkage is small, and the warp elasticity is poor. The warp elasticity can be controlled and adjusted as needed, and the uniform gram weight of the fabric surface can be maintained.

[0141] On the other hand, if the weft width is widened, the distance between the two wheels is wide (the wave wrinkles are low), the shrinkage is large, and due to the lack of fiber quantity caused by fewer wrinkles, there will be problems of uneven fabric surface and inconsistent gram weight; if the weft width is narrowed, the distance between the two wheels is close (the wave wrinkles are high), and the fabric will become thicker and the elasticity will decrease.

[0142] Specifically, at the same width expansion ratio, the depth and uniformity of the wave wrinkles will affect the flatness of the fabric surface (that is, the uneven gram weight per unit area of the fabric). During the weft width expansion stretching and necking process at an appropriate temperature, the fibers with high and evenly arranged wave wrinkles are more likely to expand evenly; however, in the case of low and unevenly arranged wave wrinkles, the fibers at the thinner part of the fabric surface will be stretched first and unevenly, making the fabric surface thinner. Moreover, in the case of uneven density of the wave wrinkles, it will cause uneven warp continuous necking.

[0143] What the present utility model improves compared with the prior art is: the height and uniform arrangement of the wave wrinkles can be controlled; the warp continuous and stable necking of the non-woven fabric can be promoted by precisely controlling the process conditions, so that the warp continuous shrinkage ratio (continuous elasticity) of each part of the fabric surface is consistent; and the elastic extension and recovery effect of the non-woven fabric can be controlled, and the uniform gram weight per unit area of the fabric surface can be achieved.

[0144] Subsequently, the needle bar chain 40 feeds the non-woven fabric 10 with flattened wave wrinkles into the internal space 62 of the heating device 60 along the warp direction from the inlet 61 of the heating device 60.

[0145] Thereafter, in the preheating section 62a of the heating device 60, the needle bar chains 40 on both sides of the non-woven fabric 10 are fixed, and while maintaining a fixed weft spacing, that is, without changing the width of the non-woven fabric 10, the non-woven fabric 10 is transported in the warp direction to the width expanding section 62b; at the same time, the heating device 60 heats the non-woven fabric 10 to soften it for subsequent processing and shaping.

[0146] Subsequently, in the width expanding section 62b of the heating device 60, the heating device 60 continuously heats the non-woven fabric 10 to keep it at the softening temperature; at the same time, the needle bar chains 40 fixing the weft sides of the non-woven fabric 10 continuously transport the softened non-woven fabric 10 in the warp direction while the weft spacing is gradually widened, so as to stretch the non-woven fabric 10 in the weft direction by using the gradually widened weft spacing, thereby increasing the weft width of the non-woven fabric 10.

[0147] Preferably, the weft width expansion ratio of the non-woven fabric 10 in the width expanding section 62b can be, for example, between 15 and 100% (that is, finally stretched to a weft width that is 1.15 to 2 times its original weft width in the width expanding section 62b).

[0148] For example, if the weft width of the non-woven fabric is 100 cm, after warp and weft width expansion and stretching, the weft width becomes 115 cm, so the weft width expansion ratio is 115%. Another example, if the weft width of the non-woven fabric is 100 cm, after warp and weft width expansion and stretching, the weft width becomes 200 cm, so the weft width expansion ratio is 200%.

[0149] In addition, the weft width expansion ratio of commercially available setting machines can be up to 450% for example.

[0150] During the weft stretching process, the fibers of the non-woven fabric 10 are mechanically and continuously stretched in the weft direction by using the gradually widened weft spacing of the needle bar chains 40, changing the directionality of the fiber structure, making the fiber structure of the non-woven fabric 10 oriented in the weft direction, so that it has an extension recovery force in the warp direction. At the same time, due to the weft stretching, the non-woven fabric 10 undergoes a necking compensation effect in the warp direction due to the Poisson effect, thereby flattening the waves and wrinkles that extend in the warp direction and are flattened, making the fabric surface flat.

[0151] Then, in the stabilization section 62c of the heating device 60, the heating device 60 continuously heats the non-woven fabric 10 to keep it at the softening temperature; at the same time, the needle bar chains 40 fixing the weft sides of the non-woven fabric 10 transport the softened and stretched non-woven fabric 10 in the warp direction while maintaining the widened weft spacing, that is, while keeping the non-woven fabric 10 at the widened width, so that the non-woven fabric 10 is kept in the softened and width-expanded state for a period of time, thereby stabilizing the stretched and width-expanded non-woven fabric 10.

[0152] Finally, the gripper chains 40 on both weft sides of the non-woven fabric 10 send the stabilized non-woven fabric 10 out of the heating device 60 from the outlet 63 to cool and shape the stabilized non-woven fabric 10, that is, shape it in a state of being stretched and widened in the warp direction and having warp elasticity, thereby forming the warp elastic non-woven fabric of the present utility model.

[0153] After cooling and shaping, the fiber structure of the non-woven fabric 10 is oriented in the weft direction and forms the shape of a telescopic robotic arm (as shown in Figure 1b). When a warp tensile force is applied, the fiber structure of the non-woven fabric 10 oriented in the weft direction can be stretched in the warp direction back to the state where the fiber orientation is not changed, so it has warp extensibility; and after the application of the warp tensile force stops, the elastic non-woven fabric will return to the state oriented in the weft direction again, so it has warp recovery. Therefore, due to the stretching and widening in the weft direction to form weft orientation, the warp elastic non-woven fabric of the present utility model is given the characteristic of high tensile recovery superior to the elastic non-woven fabric of the prior art.

[0154] Refer to Figure 10 , which shows a flowchart of the manufacturing method of the warp elastic non-woven fabric of the present utility model. The manufacturing method of the elastic non-woven fabric of the present utility model includes: a feeding step S10, a wave forming step S20, a fixing step S30, a flattening step S40, a preheating step S50, a widening step S60, a stabilizing step S70, and a cooling step S80.

[0155] The elements used in the following steps, such as the heating device, gripper chains, feeding wheel sets, and brush wheels, can be the elements mentioned above, such as the heating device 60, gripper chains 40, feeding wheel set F, and brush wheel 50. Therefore, the features and details of these elements will not be elaborated further.

[0156] In the feeding step S10, a non-woven fabric is fed by using at least two sets of feeding wheel sets. Among them, the differential gears of the feeding wheel sets feed the two weft sides of the non-woven fabric in the warp direction between the differential gears and the suction gears of the feeding wheel sets respectively.

[0157] In the feeding step 10, the fed non-woven fabric can be the non-woven fabric 10 as described above. Therefore, the features and details of the non-woven fabric will not be elaborated further.

[0158] In the wave forming step S20, the differential gear and the suction gear are engaged and rotated in such a way that the first tooth part of the differential gear is inserted into the second groove part of the suction gear and the second tooth part of the suction gear is inserted into the first groove part of the differential gear, so that the two weft sides of the non-woven fabric are respectively caught between these first tooth parts and these second groove parts and between these first groove parts and these second tooth parts, thereby forming regular wave wrinkles in the warp direction of the non-woven fabric.

[0159] In the fixing step S30, the wavy wrinkles of the non-woven fabric are fixed by means of a suction gear and a needle clip chain in the form of at least two conveyor belts. Among them, suction is provided through the suction holes of the suction gear so that the two sides in the weft direction of the non-woven fabric are respectively closely attached to the outer surfaces of the second tooth part and the second groove part of the suction gear. And, the needle clip chain is operated in the form of a conveyor belt while the suction gear rotates, so that the needles respectively penetrate into the non-woven fabric and enter the hollow grooves of the suction gear to fix the wavy wrinkles of the non-woven fabric. And, after the needles penetrate into the non-woven fabric, the suction gear stops providing suction so that the non-woven fabric can be smoothly transferred from the suction gear to the needle clip chain.

[0160] In the flattening step S40, the wavy wrinkles of the non-woven fabric are flattened by at least two brush wheels. Among them, the brush wheels are rotated while the needle clip chain is operated in the form of a conveyor belt to flatten the wavy wrinkles of the non-woven fabric on the needle clip chain.

[0161] In the preheating step S50, the non-woven fabric is conveyed in the warp direction by means of the needle clip chain while maintaining a fixed weft spacing, and at the same time, the non-woven fabric is heated to a softened state by a heating device.

[0162] In the width expanding step S60, under the condition of continuously heating by a heating device, the softened non-woven fabric is conveyed in the warp direction by means of the needle clip chain while the weft spacing is gradually widened to perform weft stretching on the non-woven fabric, so that the non-woven fabric undergoes necking compensation in the warp direction due to Poisson's effect due to the weft stretching, thereby flattening the wavy wrinkles extending in the warp direction and being flattened. At the same time, the fiber structure of the non-woven fabric is oriented in the weft direction, so that the fabric surface is presented in a flat shape and the non-woven fabric has an extension recovery force in the warp direction.

[0163] In the stabilizing step S70, under the condition of continuously heating by a heating device, the softened and stretched non-woven fabric is conveyed in the warp direction by means of the needle clip chain while maintaining the widened weft spacing to stabilize the non-woven fabric.

[0164] In the cooling step S80, the stabilized non-woven fabric is cooled to be shaped, thereby forming a warp elastic non-woven fabric.

[0165] In the manufacturing method of the warp elastic non-woven fabric of the present utility model, the differential gear feeds the non-woven fabric in the warp direction between the differential gear and the suction gear at a conveying speed higher than that of the needle clip chain in the supply step S10.

[0166] Preferably, the warp elongation rate of the warp elastic non-woven fabric of the present utility model manufactured by the above equipment or the above method is between 50% and 350% (that is, it can be stretched to a warp width 1.5 to 4.5 times its natural warp width).

[0167] Preferably, in the above method, the suction holes are further provided on the second tooth parts.

[0168] Preferably, the heating temperature in the preheating step S50, the width expanding step S60, and the stabilizing step S70 is 120 to 180°C, preferably 130 to 150°C.

[0169] Preferably, in the width expanding step S60, the weft width expansion ratio of the non-woven fabric 10 is between 15 and 100%. Preferably, in the cooling step S80, the non-woven fabric 10 after the stabilizing step S70 is cooled, for example, by air cooling or standing at room temperature, so that the non-woven fabric 10 returns to the non-softened state, thereby fixing the shape of the non-woven fabric 10.

[0170] Preferably, in the fixing step S30, each needle on the needle bar chain is aligned with the peak and / or trough of the wave creases of the non-woven fabric.

[0171] Preferably, in the above method, the distance between the first tooth parts: the distance between the second tooth parts: the distance between the needles is adjusted to 1:1:1 or 1:1:0.5.

[0172] Referring to Figure 11 and Figure 12 , the present utility model provides a warp elastic non-woven fabric 100, which can be made by the manufacturing equipment or manufacturing method as described above, and has the characteristics and technical effects as described above.

[0173] Specifically, referring to Figure 11 , the warp elastic non-woven fabric 100 of the present utility model has a flat surface. Further, referring to Figure 12 , it shows Figure 11 a partial enlarged view of region a, wherein the fiber structure 110 of the warp elastic non-woven fabric 100 is substantially oriented in the weft direction.

[0174] When being stretched by an external force in the warp direction, since the fiber structure 110 of the non-woven fabric 100 oriented in the weft direction can be stretched back to the state where the fiber orientation is not changed in the warp direction, after the external force stretching stops, the fiber structure 110 of the non-woven fabric 100 will return to the state oriented in the weft direction again. Therefore, it has the characteristic of high warp tensile recovery of the elastic non-woven fabric superior to the prior art, that is, it has a high extension recovery force.

[0175] In summary, the functions of the present utility model are as follows. First, by feeding the non-woven fabric through the differential gears and the suction gears that mesh with each other, regular wave wrinkles can be formed on the non-woven fabric, which is beneficial to ensuring the surface flatness of the final elastic non-woven fabric. Second, by means of the suction force on the suction gears, the non-woven fabric can be closely attached to the outer surfaces of the teeth and grooves of the suction gears, and the wave wrinkles of the non-woven fabric can be transferred to the subsequent processes as they are, which is beneficial to improving the uniformity of the final fabric surface. Third, by providing a hollow groove in the center of the outer surface of the suction gear, a accommodating space can be provided for the needles on the needle chain after they penetrate into the non-woven fabric. Fourth, by slightly stretching the non-woven fabric in the weft direction under heating to change the fiber orientation and then cooling and shaping, the non-woven fabric can have better elasticity in the warp direction than the prior art. Fifth, by pre-forming uniform wave wrinkles, the phenomenon of area reduction or thickness thinning of the non-woven fabric caused by necking during subsequent stretching can be compensated. Sixth, by enabling the single-layer non-woven fabric to have excellent elasticity after processing, additional bonding materials or bonding steps can be omitted, thereby reducing the manufacturing cost, thinning the product to improve the user comfort, and reducing the space and cost required for storage and transportation.

[0176] Those with ordinary knowledge in the technical field related to the content of the present utility model will understand that various modifications and changes, such as combination, separation, substitution, and configuration change, can be made to the above embodiments without departing from the basic features of the content of the present utility model.

[0177] Therefore, the embodiments of the present utility model are intended to illustrate the scope of the technical idea of the present utility model, and the scope of the present utility model is not limited by the above embodiments. Therefore, any modification or change made to the present utility model in the same spirit of the utility model should still be included within the scope intended to be protected by the present utility model.

Claims

1. A manufacturing device for warp elastic nonwoven fabric, characterized in that: include: A heating device having an inlet, an inner space and an outlet in sequence along the longitudinal direction, wherein the inner space is divided into: a preheating section adjacent to the inlet, an expansion section in the middle, and a stabilization section adjacent to the outlet; At least two needle clip chains in the form of conveyor belts are respectively located on both sides of the heating device in the weft direction and extend from the entrance of the heating device in the warp direction through the preheating section, the expansion section and the stabilization section in sequence to the exit, and each of the plurality of needle clip chains is provided with a plurality of needles; At least two groups of feeding wheels are respectively arranged above the plurality of needle clip chains at the entrance of the heating device; as well as At least two brush wheels are respectively arranged above the plurality of needle clip chains at the warp downstream of the plurality of feeding wheel groups; in Each of the plurality of feeding wheel groups includes a speed differential gear and a suction gear meshing with each other, wherein Each of the plurality of speed differential gears is provided with a plurality of first tooth portions and a plurality of first groove portions, which are arranged alternately along the outer circumferential surface of the speed differential gear, and A hollow groove is provided at the latitudinal center of the outer surface of each of the plurality of suction gears, and each of the plurality of suction gears is provided with a plurality of second teeth, a plurality of second grooves and a plurality of suction holes on both sides of the latitudinal direction of the hollow groove, wherein the plurality of second grooves and the plurality of second teeth are respectively arranged alternately along both sides of the latitudinal direction of the outer circumferential surface of the suction gear, and the plurality of suction holes are at least provided on the plurality of second grooves, wherein The multiple speed differential gears feed the two sides of the non-woven fabric in the weft direction into between the multiple speed differential gears and the multiple suction gears along the warp direction at a conveying speed higher than that of the multiple needle clip chains, wherein the multiple speed differential gears and the multiple suction gears mesh and rotate with each other in a manner that the multiple first teeth are inserted into the multiple second grooves and the multiple second teeth are inserted into the multiple first grooves, so that the two sides of the non-woven fabric in the weft direction are respectively sunk between the multiple first teeth and the multiple second grooves and between the multiple first grooves and the multiple second teeth, thereby forming regular wavy wrinkles on the non-woven fabric along the warp direction; the multiple suction gears feed the two sides of the non-woven fabric in the weft direction into between the multiple first teeth and the multiple second grooves and between the multiple first grooves and the multiple second teeth through the multiple needle clip chains. The suction holes provide suction force so that both sides of the non-woven fabric fed are respectively in close contact with the outer surfaces of the second teeth and the second grooves, and the plurality of hollow grooves are configured so that the plurality of needles respectively penetrate into the non-woven fabric fed and enter into the plurality of hollow grooves when the plurality of needle clip chains are operated in a conveyor belt manner while the plurality of suction gears rotate, so as to fix the wavy wrinkles of the non-woven fabric fed, and the plurality of suction gears stop providing the suction force after the plurality of needles penetrate into the non-woven fabric fed, so as to smoothly transfer the non-woven fabric from the plurality of suction gears to the plurality of needle clip chains; The plurality of brush wheels rotate while the plurality of needle clip chains operate in a conveyor belt manner to flatten the wave wrinkles of the non-woven fabric on the plurality of needle clip chains; and The plurality of needle clip chains feed the nonwoven fabric having the flattened corrugated folds from the inlet of the heating device into the inner space of the heating device along the warp direction, pass through the preheating section, the expansion section and the stabilization section, and are fed out of the heating device from the outlet, wherein In the preheating section, the plurality of needle clip chains have a fixed weft spacing, In the expansion section, the weft spacing of the plurality of needle clip chains gradually widens, and In the stabilization section, the plurality of clip chains maintain a widened weft spacing.

2. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: The plurality of air suction holes are further arranged on the plurality of second teeth.

3. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: The heating temperature of the heating device is 120 to 180°C.

4. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: The weft expansion ratio of the nonwoven fabric in the expansion section is between 15 and 100%.

5. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: Each needle on the needle clip chain is respectively aligned with the wave crest and / or wave trough of the wave wrinkles.

6. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: The spacing between the first teeth: the spacing between the second teeth: the spacing between the needles is 1:1:1 or 1:1:0.

5.

7. The manufacturing equipment of the warp elastic nonwoven fabric according to claim 1, characterized in that: The nonwoven fabric is made by spunbonding, hydroentanglement, thermal bonding, meltblowing, or needle punching.

8. A warp elastic nonwoven fabric made according to the manufacturing apparatus according to any one of claims 1 to 7, characterized in that: The warp elastic nonwoven fabric has a flat surface, and its fiber structure is oriented along the weft direction, so that the warp elastic nonwoven fabric has extension recovery force along the warp direction.

9. The warp elastic nonwoven fabric according to claim 8, characterized in that: The warp elongation of the warp elastic nonwoven fabric is between 50 and 350%.

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