Preparation method of composite non-woven fabric capable of increasing elasticity by using wrinkles

Abstract

The invention relates to a preparation method of a composite non-woven fabric for increasing elasticity by using wrinkles. The preparation method comprises the following steps: S1, uncoiling, positioning and adjusting an upper-layer non-woven fabric and an elastic film; s2, the adjusted upper-layer non-woven fabric is wrinkled in the CD or MD direction through an upper-layer wrinkling mechanism; aligning the folded upper-layer non-woven fabric with the elastic film; s3, feeding the corrected and aligned upper-layer non-woven fabric and the elastic film into a first compounding device, and compounding and connecting the bottom of the wrinkles and the contact surface of the elastic film to obtain a double-layer elastic non-woven fabric material; and S4, the elastic material subjected to compounding operation is subjected to tension adjustment and alignment and then is wound. According to the invention, an elastic material in a single CD or MD direction can be manufactured, and a four-side elastic material can also be manufactured; the wrinkle design is added on the non-woven fabric, so that the stretching of the elastic film is reduced or even replaced, and the probability of film breakage is reduced; the function of local elasticity can be achieved, and the firmness of connection of the elastic non-woven fabric is improved by adopting a layered welding composite mode.

Description

Technical Field

[0001] The present invention relates to the technical field of elastic materials, and in particular to a method for preparing a composite non-woven fabric that increases elasticity by utilizing wrinkles. Background Art

[0002] The traditional elastic non-woven fabric materials currently available on the market are made by adding an elastic film stretched in the CD or MD direction to the upper and lower non-woven fabric layers, and then compounding the three layers together through ultrasound. The compounded material has elasticity in the CD or MD direction. However, this process has some defects. First, it can only achieve elasticity in one direction. Second, the production process has extremely high requirements on the stretch rate and quality of the film, resulting in a high scrap rate and frequent film breakage. Third, there is no way to achieve local elastic release.

[0003] Therefore, in view of the shortcomings of the existing technology, it is necessary to design a method for preparing a composite non-woven fabric that uses wrinkles to increase elasticity to solve the above problems.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solution of the present invention and facilitating the understanding of those skilled in the art. It cannot be assumed that the above contents are well known to those skilled in the art simply because they are explained in the background technology of the present invention. Summary of the Invention

[0005] In order to overcome the deficiencies in the above-mentioned prior art, the purpose of the present invention is to disclose a method for preparing a composite non-woven fabric that uses pleats to increase elasticity. By adding a pleat design to the non-woven fabric, the stretching of the elastic film is reduced or even replaced, and an elastic non-woven fabric is prepared. By cross-designing the pleat direction and the stretching direction of the elastic film, the elastic non-woven fabric material has four-sided elasticity. At the same time, by optimizing the welding points, the elastic non-woven fabric material has good air permeability and welding strength.

[0006] The present invention discloses a method for preparing a composite non-woven fabric that increases elasticity by utilizing wrinkles, and the main steps are:

[0007] S1, unwinding and positioning the upper non-woven fabric and elastic film;

[0008] S2, the adjusted upper non-woven fabric is made into uniform pleats along the CD direction or the MD direction by the upper pleating mechanism; the pleated upper non-woven fabric and the elastic film are corrected and aligned with each other;

[0009] S3, feeding the aligned upper non-woven fabric and the elastic film into a first composite device, where the first composite device composites the bottom of the pleats with the contact surface of the elastic film to form a double-layer elastic non-woven fabric material. The pleats replace the stretching of the elastic film, thereby preventing the elastic film from being damaged during stretching and welding.

[0010] S4, after the composite operation, the elastic material is tension-adjusted and aligned before being rolled up.

[0011] Preferred technical solution: in step S2, when the upper non-woven fabric is made into uniform wrinkles along the CD direction, the elastic film is stretched along the MD direction; when the upper non-woven fabric is made into uniform wrinkles along the MD direction, the elastic film is stretched along the CD direction, and a non-woven fabric material with elasticity in all four directions is obtained through a cross design.

[0012] Preferred technical solution: After the elastic film is unrolled in step S1, it is first cut into strips according to needs, and then in step S2, the upper non-woven fabric is matched with the elastic film after the strip cutting and is locally pleated in the CD direction. After local pleating, the width of the non-woven fabric in this area is between 0.3 and 0.7 times that before pleating, thereby obtaining a non-woven fabric material with local elasticity.

[0013] Preferred technical solution: in step S2, when the upper non-woven fabric is made into uniform wrinkles along the CD direction, the elastic film is stretched along the CD direction; when the upper non-woven fabric is made into uniform wrinkles along the MD direction, the elastic film is stretched along the MD direction to obtain a non-woven fabric material with high elasticity in the CD direction or MD direction.

[0014] Preferred technical solution: After step S3 is completed, a lower layer of non-woven fabric with the same wrinkle direction and position as the upper layer of non-woven fabric is added under the double-layer elastic non-woven fabric material, and the double-layer elastic non-woven fabric material and the lower layer of non-woven fabric are corrected and aligned and then sent into the second composite device. The second composite device is used to composite the bottom of the wrinkles of the lower layer of non-woven fabric with the contact surface of the elastic membrane to obtain a three-layer elastic non-woven fabric material. The layered composite operation can make the upper and lower layers of non-woven fabrics more firmly connected and not easy to be torn apart.

[0015] Preferred technical solution: The first composite device and the second composite device are both hot melt composite devices, which consist of a bottom roller and a hot melt unit. The bottom roller is provided with a welding pattern structure for forming uniform welds at the contact surface between the bottom of the fold and the elastic film. During the hot melt composite operation, the tension adjustment device is used to melt the front side of the weld and the elastic film and tear it open under the action of tension to form pores, and the size of the pores is adjusted by the distance before and after the weld.

[0016] Preferred technical solution: The hot melt unit can be welded by ultrasonic welding or hot pressure welding, and the welding pattern structure is a uniformly distributed regular quadrilateral weld point, or a uniformly dislocated circular or elliptical weld point. When the weld point is a uniformly distributed regular quadrilateral weld point, while ensuring air permeability, the elasticity is increased by increasing the ratio of the length to the width of the weld point in the elastic direction; when the weld point is a uniformly dislocated circular or elliptical weld point, while ensuring air permeability, the elasticity is increased by increasing the ratio of the spacing between adjacent columns of weld points to the spacing between adjacent rows of weld points in the elastic direction, thereby improving the elasticity while maintaining the connection strength and air permeability.

[0017] Preferred technical solution: The longitudinal spacing a1 of the regular quadrilateral solder joints is 0.5-5 times the transverse length c1 of the solder joints, the transverse spacing b1 is 0.5-3 times the transverse length c1 of the solder joints, and the longitudinal width d1 of the solder joints is 0.1-2 times the transverse length c1 of the solder joints, wherein the size of c1 and d1 determines the area size of a single solder joint, and the spacing between b1 and a1 determines the number of solder joints per unit area. The higher the proportion of the solder joint area per unit area, the better the air permeability, but the strength will decrease. The above ratio can ensure that the strength and air permeability of the connection are within an appropriate range. At the same time, the ratio of c1 to d1 determines the elasticity of the material in the MD and CD directions. When the ratio is greater than 1, the elasticity in the MD direction is greater than the elasticity in the CD direction, and when the ratio is less than 1, the elasticity in the MD direction is less than the elasticity in the CD direction; for circular or elliptical solder joints The longitudinal spacing a2 is 1-5 times the longitudinal axis length c2 of the weld, the transverse spacing b2 is 1-5 times the longitudinal axis length c2 of the weld, the transverse axis length d2 is 0.5-5 times the longitudinal axis length c2 of the weld, and the straight-line distances e and f between the staggered welds are 1-10 times the longitudinal axis length c2 of the weld. The sizes of c2 and d2 determine the area of ​​a single weld, and the spacing between b2 and a2 determines the number of welds per unit area. The higher the proportion of weld area per unit area, the better the air permeability, but the strength will decrease. The above ratio can ensure that the strength and air permeability of the connection are within an appropriate range. At the same time, the ratio of 2b2 to a2 determines the elasticity of the material in the MD and CD directions. When the ratio is greater than 1, the elasticity in the MD direction is greater than the elasticity in the CD direction. When the ratio is less than 1, the elasticity in the MD direction is less than the elasticity in the CD direction.

[0018] Preferred technical solution: the upper non-woven fabric and the lower non-woven fabric can be spunbond non-woven fabric, hot air non-woven fabric, hot-rolled non-woven fabric and stretch non-woven fabric; the elastic film can be PE film, PET film, SBS film and Poe film.

[0019] The preferred technical solution is as follows: when the elastic film is stretched in the MD direction, the stretching ratio range is between 1.5 and 5 times, and at the same time, the shrinkage ratio range of the elastic film in the CD direction is between 0.5 and 0.9 times; when the elastic film is stretched in the CD direction, the stretching ratio range is between 1.5 and 3 times, and at the same time, the shrinkage ratio range of the elastic film in the MD direction is between 1 and 1.5 times.

[0020] Due to the application of the above technical solution, the method for preparing a composite non-woven fabric that increases elasticity by utilizing wrinkles of the present invention has the following beneficial effects:

[0021] (1) It is easy to manufacture elastic materials in a single CD or MD direction, and it is also possible to manufacture elastic materials in four directions.

[0022] (2) By adding pleat design to the non-woven fabric, the stretching of the elastic film is reduced or even replaced, which greatly reduces the probability of film breakage.

[0023] (3) By combining the strip elastic membrane with the local pleat design, the local elastic function can be realized on the surface of the material.

[0024] (4) A composite method of layered welding is used to increase the firmness of the connection of the elastic non-woven fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a transverse cross-sectional view of the double-layer elastic composite nonwoven fabric of the present invention;

[0026] Figure 2 is a transverse cross-sectional view of the three-layer elastic composite nonwoven fabric of the present invention;

[0027] Figure 3 Schematic diagram of the preparation process of the double-layer elastic composite non-woven fabric of the present invention;

[0028] Figure 4 This is a schematic diagram of the preparation process of the three-layer elastic composite non-woven fabric of the present invention;

[0029] Figure 5 Schematic diagram of the dimensional change of the nonwoven fabric of the present invention when wrinkled along the CD direction;

[0030] Figure 6 Schematic diagram of the dimensional change of the elastic film when stretched along the CD direction in the present invention;

[0031] Figure 7 Schematic diagram of the size change of the wrinkles of the non-woven fabric in the present invention;

[0032] Figure 8 Schematic diagram of the welding pattern structure of a regular quadrilateral welding point in the present invention;

[0033] Figure 9 Schematic diagram of the welding pattern structure of the circular or elliptical welding spot in the present invention. DETAILED DESCRIPTION

[0034] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0035] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance. Terms such as "horizontal", "vertical" and "overhanging" do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] Example 1:

[0037] like Figure 3 As shown, the upper non-woven fabric 1 and the elastic film 3 are unwound by an uncoiler and positioned and adjusted by a buffer tower, a driving roller, a tension control unit, and a deviation corrector. The upper non-woven fabric 1 is a spunbond non-woven fabric, and the elastic film 3 is a PE film.

[0038] like Figure 1 、 Figure 3 and Figure 5 As shown, the adjusted upper non-woven fabric 1 is made into uniform pleats along the CD direction by the pleating mechanism 4, the width a of the pleats is between 0.5 mm and 4 mm, the height b is between 0.3 mm and 2 mm, and the transverse shrinkage ratio after pleating is between 0.4 and 0.9 times, and the elastic film 3 is not stretched, and the pleated upper non-woven fabric 1 and the elastic film 3 are corrected and aligned with each other; wherein, the shrinkage ratio = size d after pleating / size D before pleating.

[0039] like Figure 1 、 Figure 3 and Figure 8 As shown, the corrected and aligned upper non-woven fabric 1 and the elastic film 3 are fed into the first composite device 5, and composited by the first ultrasonic welding unit 51 and the first bottom roller 52. The bottom of the pleats and the contact surface of the elastic film are welded with evenly distributed regular quadrilateral welds, and the tension adjustment device is used to melt the front side of the weld and the elastic film and tear it open under the action of tension to form pores, finally obtaining a CD direction elastic non-woven fabric material, wherein the size range of the weld is 0.5*c1≤a1≤5*c1, 0.5*c1≤b1≤3*c1, 0.1*c1≤d1≤2*c1.

[0040] like Figure 3As shown, the elastic material prepared by the composite operation passes through the tension control system, the pressure roller traction and the corrector and finally enters the winder 9 for winding.

[0041] Example 2:

[0042] like Figure 3 As shown, the upper non-woven fabric 1 and the elastic film 3 are unwound by an uncoiler and adjusted by a buffer tower, a driving roller, a tension control unit and a deviation corrector;

[0043] like Figure 1 、 Figure 3 and Figure 6 As shown, the adjusted upper non-woven fabric 1 is made into uniform pleats along the MD direction by the pleating mechanism 4, with the pleat width a ranging from 0.5 mm to 4 mm and the height b ranging from 0.3 mm to 2 mm. The elastic film 3 is stretched along the CD direction by the elastic film stretching device 6, with the stretching ratio of the elastic film in the CD direction ranging from 1.5 to 3 times, and the transverse shrinkage ratio of the elastic film 3 ranging from 1 to 1.5 times. The pleated upper non-woven fabric 1 and the elastic film 3 are corrected and aligned with each other; wherein, when the elastic film 3 is stretched in the CD direction, the stretching ratio = width after stretching e1 / width before stretching E1, and the shrinkage ratio of the elastic film 3 = length after stretching f1 / length before stretching F1;

[0044] like Figure 3 and Figure 9 As shown, the corrected and aligned upper non-woven fabric 1 and the elastic film 3 are fed into the first composite device 5, and composited by the first ultrasonic welding unit 51 and the first bottom roller 52. The bottom of the pleats and the contact surface of the elastic film 3 are welded with evenly staggered elliptical welds, and the tension adjustment device is used to melt the front side of the weld and the elastic film and tear it open under the action of tension to form pores, thereby obtaining a four-sided elastic material, wherein the size range of the weld is 1*c2≤a2≤5*c2, 1*c2≤b2≤5*c2, 0.5*c2≤d2≤5*c2, 1*c2≤e≤10*c2, and 1*c2≤f≤10*c2.

[0045] like Figure 3 As shown, the elastic material prepared through the compounding operation passes through a tension control system, a pressure roller traction and a deviation corrector and finally enters a winder 9 for winding.

[0046] The obtained four-sided elastic material was tested, and the test results are shown in Table 1 below:

[0047] Test items Test Method unit Sample 1 Sample 2 Sample 3 Basis weight ASTM D5035 <![CDATA[g / m 2 ]]> 77.3 78.5 79.1 MD tensile strength ASTM D3776 N / 2 Inch 51.2 59.9 65.3 MD elongation at break ASTM D3776 ％ 457.5 436.5 392.1 CD tensile strength ASTM D3776 N / 2 Inch 21.7 25.8 23.0 CD breaking elongation ASTM D3776 ％ 349.5 436.1 415.0 Air permeability ISO 9237 mm / s 355 321 360

[0048] Example 3:

[0049] like Figure 3As shown, the upper non-woven fabric 1 and the elastic film 3 are unwound by an uncoiler, wherein the upper non-woven fabric 1 is adjusted by a buffer tower, a driving pressure roller, a tension control unit and a corrector; after the elastic film 3 is unwound, it is first cut into strips using a slitting device 7 according to demand, and then adjusted by a buffer tower, a driving pressure roller, a tension control unit and a corrector;

[0050] like Figure 1 、 Figure 3 and Figure 7 As shown, the upper non-woven fabric 1 is partially pleated in the CD direction by a pleating mechanism 4 according to the film cut from the matching strips as required. The width a of the pleats is between 0.5 mm and 4 mm, and the height b is between 0.3 mm and 2 mm. After the local pleating, the shrinkage ratio of the non-woven fabric in this area is in the range of 0.3 to 0.7 times. The elastic film 3 is not stretched, and the upper non-woven fabric 1 is corrected and aligned with the elastic film 3 after pleating. The shrinkage ratio of the local pleated area = the size c after local pleating / the size C before local pleating.

[0051] like Figure 3 As shown, the aligned upper non-woven fabric 1 and the elastic film 3 are fed into the first laminating device 5, and are laminated by the first ultrasonic welding unit 51 and the first bottom roller 52. In conjunction with the tension adjustment device, the front side of the weld is melted from the elastic film and torn apart under tension to form pores, thereby obtaining a localized strip-shaped CD-direction elastic material.

[0052] like Figure 3 As shown, the elastic material prepared through the compounding operation passes through a tension control system, a pressure roller traction and a deviation corrector and finally enters a winder 9 for winding.

[0053] The obtained local elastic material was tested, and the test results are shown in Table 2 below:

[0054] Test items Test Method unit Sample 1 Sample 2 Sample 3 CD tensile strength ASTM D3776 N / 2 Inch 23.7 22.8 26.0 CD breaking elongation ASTM D3776 ％ 301.4 295.7 310.7

[0055] Example 4:

[0056] like Figure 3 As shown, the upper non-woven fabric 1 and the elastic film 3 are unwound by an uncoiler and adjusted by a buffer tower, a driving roller, a tension control unit and a deviation corrector;

[0057] like Figure 1 and Figure 3 As shown, the adjusted upper non-woven fabric 1 is made into uniform pleats along the CD direction by the pleating mechanism 4, with the pleat width a ranging from 0.5 mm to 4 mm and the height b ranging from 0.3 mm to 2 mm. The elastic film 3 is stretched along the CD direction by the elastic film stretching device 6; the pleated upper non-woven fabric 1 and the elastic film 3 are corrected and aligned with each other;

[0058] like Figure 3 As shown, the aligned upper non-woven fabric 1 and the elastic film 3 are fed into the first laminating device 5, and are laminated by the first ultrasonic welding unit 51 and the first bottom roller 52. In conjunction with the tension adjustment device, the front side of the weld is melted from the elastic film and torn apart under tension to form pores, thereby obtaining a highly elastic CD-direction elastic material.

[0059] like Figure 3 As shown, the elastic material prepared through the compounding operation passes through a tension control system, a pressure roller traction and a deviation corrector and finally enters a winder 9 for winding.

[0060] Example 5:

[0061] like Figure 4 As shown, the upper non-woven fabric 1, the elastic film 3 and the lower non-woven fabric 2 are unwound by an uncoiler and adjusted by a buffer tower, a driving roller, a tension control unit and a deviation corrector;

[0062] like Figure 2 and Figure 4 As shown, the adjusted upper non-woven fabric 1 and the lower non-woven fabric 2 are uniformly wrinkled along the MD direction by the wrinkling mechanism 4, and the elastic film 3 is stretched along the CD direction by the elastic film stretching device 6, so that the wrinkle directions of the corresponding positions of the upper non-woven fabric 1 and the lower non-woven fabric 2 are consistent; the wrinkled upper non-woven fabric 1 and the elastic film 3 are corrected and aligned with each other;

[0063] like Figure 4 As shown, the corrected and aligned upper non-woven fabric 1 and the elastic film 3 are fed into the first composite device 5, and a composite operation is performed by the first ultrasonic welding unit 51 and the first bottom roller 52. The bottom of the pleats and the contact surface of the elastic film 3 are welded with evenly staggered elliptical welds, and the tension adjustment device is used to melt the front side of the welds and the middle elastic film and tear them open under the action of tension to form pores, thereby obtaining a double-layer four-sided elastic material. The obtained double-layer four-sided elastic material is aligned with the wrinkled lower non-woven fabric 2 and fed into the second composite device 8. A composite operation is performed by the second ultrasonic welding unit 81 and the second bottom roller 82, and the bottom of the pleats of the lower non-woven fabric 2 and the contact surface of the elastic film 3 are welded to obtain a three-layer four-sided elastic non-woven fabric material.

[0064] like Figure 4 As shown, the elastic material prepared through the compounding operation passes through a tension control system, a pressure roller traction and a deviation corrector and finally enters a winder 9 for winding.

[0065] In summary, the present invention has the following advantages over the prior art: it can produce non-woven fabric materials with single CD or MD direction and four-sided elasticity; the use of a pleat design on the non-woven fabric reduces or even replaces the stretching of the elastic film, thereby reducing the probability of film breakage; and the use of a strip elastic film combined with a local pleat design can obtain a non-woven fabric material with local elasticity.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical concepts disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for preparing a composite nonwoven fabric that increases elasticity by utilizing wrinkles, characterized in that: The main steps are: S1, unwinding and positioning the upper non-woven fabric and elastic film; S2, the adjusted upper non-woven fabric is made into uniform pleats along the CD direction or the MD direction by the upper pleating mechanism; the pleated upper non-woven fabric and the elastic film are corrected and aligned with each other; S3, feeding the corrected and aligned upper non-woven fabric and the elastic film into a first composite device, and compositely connecting the bottom of the pleats with the contact surface of the elastic film by the first composite device to obtain a double-layer elastic non-woven fabric material; S4, after the composite operation, the elastic material is tension-adjusted and aligned before being rolled up.

2. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 1, characterized in that: In step S2 , when the upper non-woven fabric is made into uniform wrinkles along the CD direction, the elastic film is stretched along the MD direction; when the upper non-woven fabric is made into uniform wrinkles along the MD direction, the elastic film is stretched along the CD direction.

3. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 1, characterized in that: In step S1 , after the elastic film is unrolled, it is first cut into strips according to demand, and then in step S2 , the upper non-woven fabric is matched with the elastic film after the strip cutting and partially pleated in the CD direction.

4. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 1, characterized in that: In step S2 , when the upper non-woven fabric is made into uniform wrinkles along the CD direction, the elastic film is stretched along the CD direction; when the upper non-woven fabric is made into uniform wrinkles along the MD direction, the elastic film is stretched along the MD direction.

5. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to any one of claims 1 to 4, characterized in that: After step S3 is completed, a lower layer of non-woven fabric with the same wrinkle direction and position as the upper layer of non-woven fabric is added under the double-layer elastic non-woven fabric material. After the double-layer elastic non-woven fabric material and the lower layer of non-woven fabric are corrected and aligned, they are sent to the second composite device. The second composite device is used to composite the bottom of the wrinkles of the lower layer of non-woven fabric with the contact surface of the elastic membrane to obtain a three-layer elastic non-woven fabric material.

6. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 5, characterized in that: The first composite device and the second composite device are both hot melt composite devices, which are composed of a bottom roller and a hot melt unit. The bottom roller is provided with a welding pattern structure for forming uniform welding points at the contact surface between the bottom of the fold and the elastic film. During the hot melt composite operation, the tension adjustment device is used to melt the front side of the welding point and the elastic film and tear it open under the action of tension to form air holes.

7. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 6, characterized in that: The hot melt unit can be welded by ultrasonic welding or hot pressure welding, and the welding pattern structure is a uniformly distributed regular quadrilateral weld point, or a uniformly dislocated circular or elliptical weld point; when the weld point is a uniformly distributed regular quadrilateral weld point, under the condition of ensuring air permeability, the elasticity is increased by increasing the ratio of the length to the width of the weld point in the elastic direction; when the weld point is a uniformly dislocated circular or elliptical weld point, under the condition of ensuring air permeability, the elasticity is increased by increasing the ratio of the spacing between adjacent columns of weld points to the spacing between adjacent rows of weld points in the elastic direction.

8. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 7, characterized in that: The longitudinal spacing a1 of the regular quadrilateral solder joints is 0.5-5 times the transverse length c1 of the solder joints, the transverse spacing b1 is 0.5-3 times the transverse length c1 of the solder joints, and the longitudinal width d1 of the solder joints is 0.1-2 times the transverse length c1 of the solder joints; the longitudinal spacing a2 of the circular or elliptical solder joints is 1-5 times the longitudinal axis length c2 of the solder joints, the transverse spacing b2 is 1-5 times the longitudinal axis length c2 of the solder joints, the transverse axis length d2 is 0.5-5 times the longitudinal axis length c2 of the solder joints, and the straight-line distances e and f between the staggered solder joints are 1-10 times the longitudinal axis length c2 of the solder joints.

9. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 5, characterized in that: The upper non-woven fabric and the lower non-woven fabric can be spunbond non-woven fabric, hot air non-woven fabric, hot-rolled non-woven fabric and elastic non-woven fabric; the elastic film can be PE film, PET film, SBS film and Poe film.

10. The method for preparing a composite nonwoven fabric with increased elasticity by utilizing wrinkles according to claim 2, characterized in that: When the elastic film is stretched in the MD direction, the stretching ratio range is between 1.5 and 5 times, and the shrinkage ratio range of the elastic film in the CD direction is between 0.5 and 0.9 times; when the elastic film is stretched in the CD direction, the stretching ratio range is between 1.5 and 3 times, and the shrinkage ratio range of the elastic film in the MD direction is between 1 and 1.5 times.

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