A two-way elastic nonwoven fabric production equipment

Abstract

The present application relates to a kind of bidirectional elastic non-woven fabric production equipment. Including upper and lower non-woven fabric unwinding mechanism, elastic film unwinding mechanism, two sets of crease pair roller, elastic film stretching mechanism, composite roller and two groups of guide roller. Crease pair roller is rolled out on upper and lower non-woven fabric, and the crease is distributed along the vertical cloth direction interval along the cloth direction extension;Elastic film stretching mechanism is pre-stretched to elastic film along the cloth direction;The outer periphery of guide roller is provided with the guide ring groove / ring table matched with crease, and is provided with second negative pressure adsorption hole to adsorb and position crease to prevent deflection;Composite roller includes upper and lower composite roller, and the outer periphery is provided with annular groove that avoids empty crease, and the groove bottom is provided with first negative pressure adsorption hole to keep the crease form and prevent tilting and burning through;Composite roller entrance is also provided with guide inclined convex to lift the upper non-woven fabric gravity and step on crease. It can ensure that crease is accurately guided and positioned to prevent heat-pressing composite area and crease area misregistration and error composite, and crease can be prevented from left and right tilting.

Description

Technical Field

[0001] This invention relates to a production equipment for bidirectional elastic nonwoven fabric. Background Technology

[0002] Non-woven fabrics are widely used in disposable underwear, pull-up diapers, menstrual pants, and medical protective equipment due to their softness, breathability, non-toxicity, and non-irritating properties. As consumers increasingly demand greater comfort and a better fit from hygiene products, the demand for elastic non-woven fabrics with good elasticity is growing.

[0003] In existing technologies, elastic nonwoven fabrics are typically manufactured by sandwiching an elastic membrane or spandex filament between two layers of nonwoven fabric and then laminating them together using hot pressing or ultrasonic waves. However, traditional production equipment can usually only achieve unidirectional elasticity of the nonwoven fabric in the fabric feeding direction (longitudinal / MD direction, generally corresponding to the direction perpendicular to the height of the human body when wearing disposable underwear, such as the waistband being stretchable and deformable to fit people with different waist sizes) using pre-stretching technology.

[0004] To address the issue of elasticity in the width direction (transverse direction), existing technologies attempt to create several pleats extending along the fabric feeding direction on the nonwoven fabric using pleating rollers before lamination. These pleats provide a physical stretching allowance in the width direction for the laminated nonwoven fabric. Combined with the pre-stretching of the elastic membrane in the fabric feeding direction, this achieves bidirectional elasticity in both the transverse and longitudinal directions.

[0005] However, when using the above-mentioned equipment for high-speed continuous production, the following serious technical defects exist:

[0006] After the nonwoven fabric is pleated by the pleating roller, it is prone to lateral (perpendicular to the fabric direction) skew during the process of being conveyed to the composite roller due to tension fluctuations or fabric drift. This causes the pleats to fail to align accurately with the corresponding clearance ring grooves on the composite roller. Consequently, the area that needs to be heat-pressed (i.e., the area between the pleats) deviates from the original position of the pleated area, preventing the heat-pressed composite area from bonding well while the pleated area is bonded instead, which seriously affects the product qualification rate.

[0007] Furthermore, even if the nonwoven fabric does not skew laterally, if the pleats on the nonwoven fabric tilt left or right before entering the composite rollers, the edges of the pleats will be squeezed into the adjacent hot-pressing composite area. This will cause the original three-layer composite structure (upper nonwoven fabric + elastic film + lower nonwoven fabric) to become a five-layer or seven-layer structure in some areas. The pressure and heat / ultrasonic energy applied by the composite rollers in the hot-pressing composite area will increase dramatically, making it very easy to directly "heat-penetrate" or "burn through" this area, resulting in large-scale product scrap.

[0008] Therefore, how to provide a bidirectional elastic nonwoven fabric production equipment that can overcome gravity collapse is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0009] The purpose of this invention is to provide a bidirectional elastic nonwoven fabric production equipment that can ensure precise guidance and positioning of pleats to prevent misalignment and incorrect bonding between the hot-pressed composite area and the pleat area, and can also prevent pleats from being burned through due to left or right tilting into the hot-pressed composite area.

[0010] The technical solution of this invention is as follows: The bidirectional elastic nonwoven fabric production equipment includes:

[0011] upper nonwoven fabric unwinding mechanism;

[0012] Lower nonwoven fabric unwinding mechanism;

[0013] Elastic film unwinding mechanism;

[0014] Two sets of pleating rollers are located downstream of the upper nonwoven fabric unwinding mechanism and the lower nonwoven fabric unwinding mechanism, respectively, and are used to roll out multiple pleats on the upper and lower nonwoven fabrics that extend along the fabric feeding direction and are spaced apart perpendicular to the fabric feeding direction.

[0015] The elastic membrane stretching mechanism is used to pre-stretch the elastic membrane along the fabric feeding direction;

[0016] The composite rollers, located downstream of the pleated rollers and the elastic film stretching mechanism, are used to combine the upper nonwoven fabric, the lower nonwoven fabric and the pre-stretched elastic film with pleats together. The composite rollers include upper and lower composite rollers that are pressed together. The outer circumferential surfaces of the upper and lower composite rollers are respectively provided with annular grooves that correspond one-to-one with the pleats on the upper and lower nonwoven fabrics. The bottom of the annular grooves is provided with a first negative pressure adsorption hole to adsorb the corresponding pleats.

[0017] Two sets of guide rollers are located on the upper and lower nonwoven fabric conveying paths between the pleated rollers and the composite rollers, respectively. The outer circumference of the guide rollers is provided with guide ring grooves or guide ring platforms that correspond one-to-one with the pleats on the nonwoven fabric. The guide ring grooves or guide ring platforms are provided with second negative pressure adsorption holes for negative pressure adsorption and positioning of the pleated areas of the nonwoven fabric.

[0018] Based on the above scheme, the following improvements are made: a guide plate is set upstream of the composite roller and near the composite roller. The guide plate is located below the upper nonwoven fabric. Each pleat on the guide plate is provided with a guide convex protrusion corresponding to each pleat on the upper nonwoven fabric. The height of the guide convex protrusion gradually increases along the fabric feeding direction, which is used to lift the pleats on the upper nonwoven fabric that are slumped under gravity upward.

[0019] Based on the above scheme, the following improvements are made: the downstream end of the guide convex extends to the composite feed biting port of the upper composite roller and the lower composite roller, and the end of the guide convex is tangentially connected to the annular groove on the upper composite roller, so that the lifted folds are directly adsorbed by the first negative pressure adsorption hole at the bottom of the annular groove.

[0020] Based on the above solution, the following improvements are made: the two ends of the guide plate are fixed to the frame.

[0021] Based on the above scheme, further improvements are made as follows: the pleating rollers include an upper pleating roller for pressing the upper nonwoven fabric and a lower pleating roller for pressing the lower nonwoven fabric; the pleats rolled by the upper pleating roller all protrude upwards; the pleats rolled by the lower pleating roller all protrude downwards; so that the upper and lower nonwoven fabrics form opposite pleats before lamination.

[0022] Based on the above scheme, the following improvements are made: a negative pressure air chamber is opened inside the guide roller, which is connected to the second negative pressure adsorption hole. The negative pressure air chamber is connected to the external negative pressure air extraction device through the air distribution rotary joint.

[0023] Based on the above scheme, the following improvements are made: negative pressure air chambers are opened inside the upper and lower composite rollers and are connected to the corresponding first negative pressure adsorption holes. The negative pressure air chambers are connected to the external negative pressure air extraction device through the gas distribution rotary joint.

[0024] Based on the above scheme, further improvements are made as follows: the composite rollers are ultrasonic composite rollers or hot-pressed composite rollers, and the composite rollers have fusion mesh patterns or welding protrusions on the flat outer circumferential surface between two adjacent annular grooves.

[0025] The beneficial effects of this application are:

[0026] By setting guide rollers with guide grooves / guide platforms on the conveying path between the pleated rollers and the composite rollers, and opening a second negative pressure adsorption hole on the guide groove / platform, the pleated areas of the nonwoven fabric can be firmly adsorbed and locked into the guide structure by negative pressure. Even if the nonwoven fabric is subjected to tension fluctuations during high-speed conveying, lateral drift of the fabric can be effectively avoided, ensuring that the pleats on the nonwoven fabric are accurately aligned with the annular grooves on the composite rollers.

[0027] The outer circumferential surfaces of the upper and lower composite rollers of the composite rollers are provided with annular grooves that mate with the folds of the nonwoven fabric, and the bottom of the annular grooves is provided with a first negative pressure adsorption hole. At the moment the three layers of materials are bonded together, the first negative pressure adsorption hole can adsorb and fix the folds outward, preventing the folds from tilting to one side and pressing into the adjacent flat composite area (hot-pressed composite area). This avoids the problem of the original three-layer composite structure (upper nonwoven fabric + elastic film + lower nonwoven fabric) becoming a five-layer or seven-layer structure locally due to the tilting of the folds, which would cause a surge in pressure and heat / ultrasonic energy and "burn through" the fabric, thus improving the continuous production stability and finished product qualification rate of the equipment.

[0028] Furthermore, by setting a guide plate with a guide convex protrusion upstream of the composite roller inlet and below the upper nonwoven fabric, the guide convex protrusion increases in height along the fabric feeding direction, which can smoothly push the upper nonwoven fabric folds that collapse downward due to gravity upward and smoothly guide them into the annular groove of the upper composite roller. This conforms to the adsorption process of the first negative pressure adsorption hole in the upper composite roller, ensuring the integrity of the upper nonwoven fabric fold shape and guaranteeing the excellent transverse elasticity and appearance flatness of the final bidirectional elastic nonwoven fabric. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the principle of a specific embodiment of a bidirectional elastic nonwoven fabric production equipment according to the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the upper pleated rollers;

[0031] Figure 3 for Figure 2 A partial structural diagram of the mating point between the upper and lower rollers of the upper and middle pleated rollers;

[0032] Figure 4 This is a three-dimensional structural diagram of the first type of lower guide roller;

[0033] Figure 5 for Figure 4 A partial cross-sectional view of the interface between the middle guide ring platform and the lower nonwoven fabric;

[0034] Figure 6 This is a partial cross-sectional view of the area where the guide ring groove of the second type of lower guide roller meets the lower nonwoven fabric.

[0035] Figure 7 This is a partial cross-sectional view of the mating area of ​​the composite rollers;

[0036] Figure 8 This is a partial cross-sectional view of the composite biaxial elastic nonwoven fabric.

[0037] Figure 9 for Figure 8 The corresponding front view of the elastic membrane;

[0038] Figure 10 A schematic diagram showing the positional relationship between the guide plate and the composite rollers;

[0039] Figure 11 for Figure 10 A magnified view of a section at point A in the middle;

[0040] Figure 12 A schematic diagram of the structure at the junction of the guide convex and the fold;

[0041] In the diagram: 11-Upper nonwoven fabric unwinding mechanism, 12-Lower nonwoven fabric unwinding mechanism, 2-Elastic film unwinding mechanism, 31-Upper pleating rollers, 32-Lower pleating rollers, 41-Upper nonwoven fabric, 42-Lower nonwoven fabric, 43-Pleated area, 44-Hot-pressed composite area, 45-Elastic film, 451-Ventilation hole, 5-Composite rollers, 51-Upper composite roller, 52-Lower composite roller, 53-Annular groove, 54-First negative pressure adsorption hole, 61-Upper guide roller, 62-Lower guide roller, 63-Guide ring groove, 64-Guide ring platform, 65-Second negative pressure adsorption hole, 7-Guide plate, 71-Guide oblique protrusion, 8-Slitting mechanism, 9-Cooling traction mechanism, 10-Wrap-up mechanism. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0044] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0045] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0046] A specific embodiment of the bidirectional elastic nonwoven fabric production equipment of the present invention: as follows Figure 1 As shown, a biaxially oriented elastic nonwoven fabric production equipment mainly includes:

[0047] Nonwoven fabric unwinding mechanism 11: used for unwinding the nonwoven fabric 41;

[0048] The nonwoven fabric unwinding mechanism 12 is used to unwind the nonwoven fabric 42.

[0049] Elastic film unwinding mechanism 2: used for unwinding films with uniformly permeable mesh (such as...) Figure 9 The breathable elastic membrane 45 (as shown);

[0050] Upper pleating roller 31 and lower pleating roller 32: are located downstream of the upper nonwoven fabric unwinding mechanism 11 and the lower nonwoven fabric unwinding mechanism 12, respectively, and are used to roll and pleat the upper nonwoven fabric 41 and the lower nonwoven fabric 42 respectively.

[0051] Elastic film stretching mechanism: Located downstream of elastic film unwinding mechanism 2, it includes a tensioning traction roller group with adjustable speed difference, used to pre-stretch the elastic film 45 along the fabric feeding direction (MD direction / longitudinal direction) (stretch ratio preferably 1.5-4 times), at which time the elastic film remains in a natural unstretched state perpendicular to the fabric feeding direction (CD direction / transverse direction).

[0052] Guide rollers: include an upper guide roller 61 located on the upper nonwoven fabric 41 conveying path and a lower guide roller 62 located on the lower nonwoven fabric 42 conveying path, which are disposed between the pleated rollers and the composite rollers. Two are shown in the figure. In other embodiments, the number of guide rollers can be increased or decreased according to the length of the conveying path between the pleated rollers and the composite rollers.

[0053] Guide plate 7: Located upstream of the composite rollers and near the feed engagement point, below the upper nonwoven fabric 41;

[0054] Composite roller 5: Located downstream of the upper and lower guide rollers and the elastic film stretching mechanism, it includes the upper composite roller 51 and the lower composite roller 52 that press against each other (e.g., ...). Figure 7 , Figure 10 As shown, it is used to hot-press or ultrasonically composite the upper nonwoven fabric 41, the lower nonwoven fabric 42 and the pre-stretched elastic membrane 45 with pleats.

[0055] Downstream of the composite rollers, there are sequentially arranged a tension release mechanism, a slitting mechanism 9, and a winding mechanism 10.

[0056] like Figure 2 , Figure 3 and Figure 4 As shown, the upper pleated roller 31 consists of a roller body with intermeshing convex teeth and grooves. The structure of the lower pleated roller 32 is basically the same as that of the upper pleated roller 31, but the convex directions are opposite.

[0057] like Figure 8 As shown, after the upper nonwoven fabric 41 is rolled by the upper pleating roller 31, multiple upwardly protruding pleated areas 43 are formed, which extend along the fabric feeding direction and are distributed at intervals along the perpendicular fabric feeding direction.

[0058] After the lower nonwoven fabric 42 is rolled by the lower pleating rollers 32, multiple downward convex pleated areas 43 are formed, which extend along the fabric feeding direction and are distributed at intervals along the perpendicular fabric feeding direction.

[0059] The pleats on the upper nonwoven fabric 41 and the lower nonwoven fabric 42 are in opposite directions (convex away from each other), such as Figure 8 As shown, the elastic membrane 45 in the middle is co-encapsulated during the composite process.

[0060] like Figure 4 , Figure 5 and Figure 6 As shown, the outer circumferential surface of the guide roller has guide structures that correspond one-to-one with the pleats on the nonwoven fabric:

[0061] The first type of guidance ( Figure 5 ): The outer peripheral surface of the guide roller protrudes to form a guide ring platform 64, which is inserted into the lower convex fold of the lower nonwoven fabric 42.

[0062] The second type of guidance ( Figure 6 ): The outer circumferential surface of the guide roller is recessed to form a guide ring groove 63, and the downward convex folds of the lower nonwoven fabric 42 are inserted into the guide ring groove 63.

[0063] Negative pressure positioning system: Uniformly distributed second negative pressure adsorption holes 65 are formed on the guide ring platform 64 or guide ring groove 63. A negative pressure air chamber is formed inside the guide roller, which is connected to an external negative pressure extraction device (such as a vacuum pump) through a gas distribution rotary joint. When the nonwoven fabric is conveyed by the guide roller, the second negative pressure adsorption holes 65 generate negative pressure, forcibly adsorbing and adhering the wrinkled area 43 to the guide ring platform 64 or guide ring groove 63, thereby preventing the nonwoven fabric from lateral deviation.

[0064] like Figure 7 As shown, the outer circumferential surfaces of the upper composite roller 51 and the lower composite roller 52 are provided with annular grooves 53 that correspond one-to-one with the pleated areas 43 on the upper nonwoven fabric 41 and the lower nonwoven fabric 42.

[0065] A first negative pressure adsorption hole 54 is provided at the bottom of the annular groove 53; both the upper composite roller 51 and the lower composite roller 52 have negative pressure air chambers that are connected to the corresponding first negative pressure adsorption holes 54, and are connected to an external negative pressure source through a gas distribution rotary joint.

[0066] Hot-pressing / ultrasonic fusion mesh or welding protrusions (not shown) are formed on the flat outer peripheral surface between two adjacent annular grooves 53. These are used to thermally fuse the flat area of ​​the nonwoven fabric (i.e., the hot-pressing composite area 44) with the elastic membrane 45 to form a hot-pressing fusion zone (e.g., Figure 8 (As shown).

[0067] like Figure 10 , Figure 11 and Figure 12 As shown, the two ends of the guide plate 7 are fixed on the equipment frame, and the guide plate 7 is set at an angle or horizontally below the upper nonwoven fabric 41.

[0068] The upper surface of the guide plate 7 is provided with guide protrusions 71 corresponding to each pleat area 43 on the nonwoven fabric 41; the height of the guide protrusions 71 gradually increases from upstream to downstream along the fabric feeding direction (e.g., ...). Figure 11 As shown), a gradually rising guide slope is formed; the downstream end of the guide slope 71 extends to the composite feed biting opening (biting line) of the upper composite roller 51 and the lower composite roller 52, and the highest point of the end of the guide slope 71 is tangentially connected to the annular groove 53 on the upper composite roller 51.

[0069] Working principle and process:

[0070] Unwinding and pleating rolling stage: The upper nonwoven fabric 41 and the lower nonwoven fabric 42 are drawn out from the upper nonwoven fabric unwinding mechanism 11 and the lower nonwoven fabric unwinding mechanism 12, respectively; the upper nonwoven fabric 41 passes through the upper pleating roller 31 and is rolled into multiple upward convex pleated areas 43 extending along the fabric running direction; the lower nonwoven fabric 42 passes through the lower pleating roller 32 and is rolled into multiple downward convex pleated areas 43 extending along the fabric running direction.

[0071] Negative pressure correction and guidance stage: The upper nonwoven fabric 41 and the lower nonwoven fabric 42 bypass the upper guide roller 61 and the lower guide roller 62 on their respective paths; the negative pressure source inside the guide roller applies negative pressure adsorption force to the wrinkled area 43 through the second negative pressure adsorption hole 65, firmly locking the wrinkles on the nonwoven fabric in the guide ring groove 63 or guide ring platform 64, correcting the fabric deviation, and ensuring that the wrinkle spacing and phase of the nonwoven fabric are accurately fixed before entering the composite roller.

[0072] Pre-stretching stage of elastic film: After the elastic film 45 with breathable mesh is drawn out from the elastic film unwinding mechanism 2, it enters the elastic film stretching mechanism and is pre-stretched 1.5-4 times along the fabric running direction (longitudinal direction) under the action of the speed difference of the tension traction roller.

[0073] Pleat anti-sagging and bite guidance stage: When the upper nonwoven fabric 41 is suspended and conveyed to the entrance of the composite roller, its upward convex pleats tend to sag downward under the influence of gravity; the upper nonwoven fabric 41 slides past the guide plate 7, and the guide oblique protrusion 71 with gradually increasing height is inserted from bottom to top under the sag pleats, gradually lifting each pleat upward to restore its convex shape; the guide oblique protrusion 71 accurately sends the lifted pleats into the entrance of the annular groove 53 of the upper composite roller 51.

[0074] Negative pressure and void-avoidance composite stage: The pre-stretched elastic membrane 45 is sandwiched between the upper nonwoven fabric 41 and the lower nonwoven fabric 42, and the three layers of materials enter the meshing joint of the upper composite roller 51 and the lower composite roller 52 together; at this time, the first negative pressure adsorption hole 54 at the bottom of the annular groove 53 of the upper composite roller 51 and the lower composite roller 52 opens the negative pressure adsorption, and pulls and adsorbs the upper convex folds of the upper nonwoven fabric 41 and the lower convex folds of the lower nonwoven fabric 42 tightly to the bottom of the annular groove 53.

[0075] The smooth outer circumferential surface of the composite rollers (with welding protrusions) applies pressure and ultrasonic / hot pressing energy to the smooth nonwoven fabric area between the wrinkled areas 43, forming a hot-pressed fusion zone, i.e., the hot-pressed composite area 44 (e.g., Figure 7 , 8 (as shown); while the folded area 43 is located within the annular groove 53 and is completely protected from air gaps and is not compacted or tilted, thus avoiding the problem of the local area becoming five layers of fabric and being burned through.

[0076] Tension release and rebound stage: After the three-layer composite fabric leaves the composite rollers, the pre-stretch tension in the fabric feeding direction is removed; the elastic membrane 45 naturally rebounds along the fabric feeding direction (longitudinal / MD direction), providing longitudinal elasticity; in the direction perpendicular to the fabric feeding direction (transverse / CD direction), the wrinkled area 43 on the nonwoven fabric provides physical deformation stretching allowance during transverse stretching, so that the nonwoven fabric can be smoothly unfolded when the composite fabric is stretched in the transverse direction, thereby obtaining a bi-directional elastic nonwoven fabric product with excellent elasticity in both the transverse and longitudinal directions.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. Two-way elastic nonwoven fabric production equipment, including: upper nonwoven fabric unwinding mechanism; Lower nonwoven fabric unwinding mechanism; Elastic film unwinding mechanism; Two sets of pleating rollers are located downstream of the upper nonwoven fabric unwinding mechanism and the lower nonwoven fabric unwinding mechanism, respectively, and are used to roll out multiple pleats on the upper and lower nonwoven fabrics that extend along the fabric feeding direction and are spaced apart perpendicular to the fabric feeding direction. The elastic membrane stretching mechanism is used to pre-stretch the elastic membrane along the fabric feeding direction; Its characteristic is that it further includes: The composite rollers, located downstream of the pleated rollers and the elastic film stretching mechanism, are used to combine the upper nonwoven fabric, the lower nonwoven fabric, and the pre-stretched elastic film with pleats together. The composite rollers include upper and lower composite rollers that are pressed together. The outer circumferential surfaces of the upper and lower composite rollers are respectively provided with annular grooves that correspond one-to-one with the pleats on the upper and lower nonwoven fabrics. The bottom of the annular grooves is provided with a first negative pressure adsorption hole to adsorb the corresponding pleats. Two sets of guide rollers are located on the upper and lower nonwoven fabric conveying paths between the pleated rollers and the composite rollers, respectively. The outer circumference of the guide rollers is provided with guide ring grooves or guide ring platforms that correspond one-to-one with the pleats on the nonwoven fabric. The guide ring grooves or guide ring platforms are provided with second negative pressure adsorption holes for negative pressure adsorption and positioning of the pleated areas of the nonwoven fabric.

2. The bidirectional elastic nonwoven fabric production equipment according to claim 1, characterized in that, A guide plate is provided upstream of and near the composite roller. The guide plate is located below the upper nonwoven fabric. Each pleat on the guide plate is provided with a guide convexity corresponding to each pleat on the upper nonwoven fabric. The height of the guide convexity gradually increases along the fabric feeding direction, which is used to lift the pleats on the upper nonwoven fabric that are slumped under gravity upward.

3. The bidirectional elastic nonwoven fabric production equipment according to claim 2, characterized in that, The downstream end of the guide convex extends to the composite feed biting joint of the upper and lower composite rollers, and the end of the guide convex is tangentially connected to the annular groove on the upper composite roller, so that the lifted folds are directly adsorbed by the first negative pressure adsorption hole at the bottom of the annular groove.

4. The bidirectional elastic nonwoven fabric production equipment according to claim 2, characterized in that, The two ends of the guide plate are fixed to the frame.

5. The bidirectional elastic nonwoven fabric production equipment according to claim 1, characterized in that, The pleating rollers include an upper pleating roller for pressing the upper nonwoven fabric and a lower pleating roller for pressing the lower nonwoven fabric; the pleats rolled by the upper pleating roller all protrude upwards; the pleats rolled by the lower pleating roller all protrude downwards; so that the upper and lower nonwoven fabrics form opposite pleats before lamination.

6. The bidirectional elastic nonwoven fabric production equipment according to claim 1, characterized in that, The guide roller has a negative pressure air chamber that communicates with the second negative pressure adsorption hole. The negative pressure air chamber is connected to an external negative pressure air extraction device through a gas distribution rotary joint.

7. The bidirectional elastic nonwoven fabric production equipment according to claim 1, characterized in that, The upper and lower composite rollers have negative pressure air chambers inside that are connected to the corresponding first negative pressure adsorption holes. The negative pressure air chambers are connected to an external negative pressure air extraction device through a gas distribution rotary joint.

8. The bidirectional elastic nonwoven fabric production equipment according to claim 1, characterized in that, The composite rollers are ultrasonic composite rollers or hot-pressed composite rollers. The composite rollers have fusion mesh patterns or welding protrusions on the flat outer circumferential surface between two adjacent annular grooves.

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