Preparation method of elastic composite material and extension gear roller device

Abstract

The invention provides a preparation method of an elastic composite material. The preparation method comprises a first supply process S1, a second supply process S2 and an elastic film supply process S3, s4, compounding: compounding an elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite material semi-finished product in an elastic non-activated or pre-activated state; a first extension process S51: extending the elastic composite material semi-finished product along the MD direction; a first extension step (S51) in which an MD extension gear roller device is arranged; the MD extension gear roller device at least comprises a first gear roller and a second gear roller. The first gear roller and the second gear roller synchronously rotate in opposite directions in the circumferential direction, the elastic composite material semi-finished product extends in the MD direction, and a through hole is formed in the joint part; a first insertion angle beta is formed by connecting lines of the tooth tips of the first tooth parts and the tooth tips of the two adjacent second tooth parts, and the first insertion angle beta is smaller than 90 degrees. The prepared elastic composite material is smooth in surface, high in air permeability and fluffy and soft in surface.

Description

Technical Field

[0001] The present invention relates to the technical field of disposable sanitary products, in particular to the fields of baby pull-up pants, adult pull-up pants, women's sanitary pants, diapers and disposable underwear, and more particularly to a preparation method of an elastic composite material and an extending gear roller device. Background Art

[0002] like Figure 1 and Figure 2 As shown, the outer body of the existing wearing articles (infant / adult pull-up pants, diapers, etc.) adopts an elastic composite material 2' which is composed of a stretched elastic material 23' fixed between an upper non-woven fabric 21' and a lower non-woven fabric 22'. The elastic material 23' can be spandex yarn, elastic film, or elastic cloth.

[0003] If the elastic material 23' is an elastic film, during the preparation process of the elastic composite material 2', the upper non-woven fabric 21', the elastic material 23' in an elongated state and the lower non-woven fabric 22' are compounded by a glue-free compounding process (including ultrasonic, hot pressing compounding process, etc.), and a plurality of joints 20c' are formed, and the elastic material 23' is melted around the joints 20c' to form openings 20a'. During compounding, the elastic material 23' is usually compounded with the upper non-woven fabric 21' and the lower non-woven fabric 22' in an elongated state of 200% to 400%.

[0004] When the elastic composite material 2' shrinks to the natural state driven by the elastic material 23', the elastic material 23' drives the upper non-woven fabric 21' and the lower non-woven fabric 22' to shrink together, so that the upper non-woven fabric 21' and the lower non-woven fabric 22' between two adjacent joints 20c' along the MD direction form a plurality of relatively large shrinkage wrinkles of convex and concave structures, and the shrinkage wrinkles can be regular or irregular, such as Figure 1 and Figure 2 shown.

[0005] When the existing elastic composite material 2' shrinks to its natural state, the existence of shrinkage wrinkles causes the thickness of the elastic composite material 2' along the TD direction to increase, and the surface of the elastic composite material 2' is not smooth enough. The elastic waist of the pull-up pants prepared using the above elastic composite material 2' will appear bloated when worn due to the existence of shrinkage wrinkles.

[0006] In addition, if the elastic material 23' is an elastic film, the elastic composite material 2' is often airtight. Although the air permeability of the elastic composite material 2' can be increased by forming openings 20a' around the joint 20c' by ultrasonic waves, there is still room for improvement.

[0007] In the prior art, when preparing the elastic composite material 2', the elastic material 23' is sandwiched between the upper non-woven fabric 21' and the lower non-woven fabric 22' and transported to the ultrasonic heat sealing unit for compounding. In order to ensure that the elastic material 23' has elasticity, the ultrasonic bottom roller of the ultrasonic heat sealing unit should pull the elastic material 23' at a higher speed (such as a speed of 200% relative to the production line speed) so that the elastic material 23' enters the ultrasonic heat sealing unit in an elongated state (for example, 200% to 400% elongated state).

[0008] After the upper non-woven fabric 21', the stretched elastic material 23' and the lower non-woven fabric 22' are compounded by the ultrasonic heat sealing unit, when the prepared elastic composite material 2' shrinks to a natural state driven by the elastic material 23', the elastic material 23' drives the upper non-woven fabric 21' and the lower non-woven fabric 22' to shrink together, resulting in the formation of a plurality of larger convex-concave shrinkage wrinkles on the upper non-woven fabric 21' and the lower non-woven fabric 22' between two adjacent joints 20c' along the MD direction, and the surface of the elastic composite material 2' is uneven, and the air permeability of the prepared wearing article is poor. Therefore, the preparation process of the elastic composite material 2' needs to be further optimized.

[0009] In addition, the existing upper non-woven fabric 21' and the lower non-woven fabric 22' have a low elongation at break. During the process of preparing the elastic composite material 2', the length of the upper non-woven fabric 21' and the lower non-woven fabric 22' extended in the stretching process is limited, resulting in the upper non-woven fabric 21' and the lower non-woven fabric 22' used to prepare the elastic composite material 2' not being fluffy and soft enough. Summary of the invention

[0010] The invention provides a preparation method of an elastic composite material and an MD stretching gear roller device to solve the technical problems that the elastic composite material prepared by the existing process has an uneven surface, poor air permeability, insufficient fluffiness and insufficient softness.

[0011] The technical solution provided by the present invention is as follows:

[0012] An object of the present invention is to provide a method for preparing an elastic composite material, the method comprising:

[0013] First supply step S1: conveying the first elongated nonwoven fabric to the composite step S4 at a first speed V1 along the MD direction;

[0014] Second supply step S2: conveying the second elongated nonwoven fabric to the composite step S4 at a second speed V2 along the MD direction;

[0015] Elastic film supplying step S3: conveying the elastic film to the compounding step S4 at a third speed V3 along the MD direction;

[0016] Compounding step S4: the compounding step S4 is equipped with an ultrasonic heat sealing unit, and the ultrasonic heat sealing unit includes an ultrasonic welding head and an ultrasonic bottom roller which are arranged opposite to each other;

[0017] Wherein, the ultrasonic bottom roller rotates in the circumferential direction at a first linear velocity V4 to compound the elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite semi-finished product in an elastically unactivated or pre-activated state;

[0018] The semi-finished elastic composite material is formed into a plurality of joints arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction; wherein the MD direction is the process direction of processing the elastic composite material, and the CD direction is perpendicular to the MD direction;

[0019] The first stretching step S51 is located at the downstream side of the composite step S4. The first stretching step S51 stretches the semi-finished elastic composite material along the MD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole.

[0020] Wherein, the first stretching process S51 is equipped with an MD stretching gear roller device; the MD stretching gear roller device at least includes a first gear roller and a second gear roller;

[0021] Wherein, a plurality of first teeth and first valleys are alternately arranged on the outer circumferential surface of the first gear roller along the circumferential direction, and a plurality of second teeth and second valleys are alternately arranged on the outer circumferential surface of the second gear roller along the circumferential direction;

[0022] The first tooth portion and the second tooth portion are alternately inserted into the second valley portion and the first valley portion without contact with each other to form a working area;

[0023] The first gear roller and the second gear roller rotate synchronously in opposite directions along the circumferential direction at a second linear speed V5, and when the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the MD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state;

[0024] Among them, when the first tooth portion and the second tooth portion are inserted into the second valley portion and the first valley portion alternately without contact with each other, the elastic composite material semi-finished product is contacted and pressed by the tooth tips of the first tooth portion and the tooth tips of the second tooth portion, and on the line connecting the axis of the first gear roller and the axis of the second gear roller, the line connecting the tooth tip of the first tooth portion and the tooth tips of two adjacent second teeth portions or the line connecting the tooth tip of the second tooth portion and the tooth tips of two adjacent first teeth portions forms a first insertion angle β, and the first insertion angle β is less than 90°.

[0025] In a preferred embodiment, the first linear velocity V4 is less than or equal to 1.25 times the third velocity V3.

[0026] In a preferred embodiment, the first linear velocity V4 is less than or equal to the third velocity V3.

[0027] In a preferred embodiment, the first speed V1, the second speed V2 and the first linear speed V4 are equal.

[0028] In a preferred embodiment, the first insertion angle β is in the range of 30° to 85°.

[0029] In a preferred embodiment, a plurality of convex portions are arranged at intervals along the circumferential direction of the ultrasonic bottom roller on the surface of the ultrasonic bottom roller, and the first elongated non-woven fabric, the second elongated non-woven fabric and the elastic film are mutually welded on the convex portions to form a plurality of the joining portions.

[0030] In a preferred embodiment, the plurality of first tooth portions and the plurality of second tooth portions respectively extend along the axial direction of the MD stretching gear roller device, and when the elastic composite semi-finished product passes through the working area of ​​the first stretching process S51, the first tooth portions and the second tooth portions respectively at least partially correspond to the joining portions of the elastic composite semi-finished product.

[0031] In a preferred embodiment, in the first extension process S51, the first tooth portion is inserted into the second valley portion without contact, and the second tooth portion is inserted into the first valley portion without contact, so that a through hole is formed in the joint area through the elastic composite material semi-finished product; in the area outside the joint, the elastic composite material semi-finished product is extended as a whole along the MD direction.

[0032] In a preferred embodiment, the first linear velocity V4 is greater than or equal to the second linear velocity V5.

[0033] In a preferred embodiment, the first linear velocity V4 is equal to 1.2 to 1.6 times of the second linear velocity V5.

[0034] In a preferred embodiment, the preparation method further comprises:

[0035] The second stretching step S52 is located at the downstream side of the first stretching step S51. The second stretching step S52 stretches the semi-finished elastic composite material in the CD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole.

[0036] Wherein, the second stretching step S52 is equipped with a CD stretching gear roller device; the CD stretching gear roller device at least includes a third gear roller and a fourth gear roller;

[0037] Wherein, the outer circumference of the third gear roller is provided with a plurality of third teeth and third valleys alternately along the axial direction, and the outer circumference of the fourth gear roller is provided with a plurality of fourth teeth and fourth valleys alternately along the axial direction;

[0038] The third tooth portion and the fourth tooth portion are alternately inserted into the fourth valley portion and the third valley portion without contact with each other to form a working area;

[0039] The third gear roller and the fourth gear roller rotate synchronously in opposite directions along the circumferential direction. When the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the CD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state;

[0040] Wherein, when the third tooth portion and the fourth tooth portion are inserted into the fourth valley portion and the third valley portion alternately without contact with each other, the elastic composite semi-finished product is pressed by the tooth tip of the third tooth portion and the tooth tip of the fourth tooth portion;

[0041] In which, the tooth tip of the third tooth portion is located on the center line of the tooth tips of the two adjacent fourth tooth portions, and the line connecting the tooth tip of the third tooth portion and the tooth tips of the two adjacent fourth tooth portions or the line connecting the tooth tip of the fourth tooth portion and the tooth tips of the two adjacent third tooth portions forms a second insertion angle δ, and the second insertion angle δ is less than 90°.

[0042] In a preferred embodiment, the preparation method further comprises:

[0043] Elastic composite material conveying step S6: along the MD direction, the elastic composite material conveying step S6 is arranged at the downstream side of the first stretching step S51, and is used to clamp the elastic composite material and convey it to the downstream side.

[0044] In a preferred embodiment, the elastic composite material conveying step S6 is equipped with a conveying roller device; the conveying roller device at least includes a conveying roller and a clamping roller;

[0045] The conveying roller and the clamping roller are arranged opposite to each other, and the conveying roller rotates along the circumferential direction at a third linear speed V6. The clamping roller and the conveying roller clamp the elastic composite material and convey it to the downstream side.

[0046] In a preferred embodiment, the third linear velocity V6 is greater than or equal to 1.2 times of the second linear velocity V5 at which the first gear roller and the second gear roller rotate synchronously in opposite directions along the circumferential direction.

[0047] In a preferred embodiment, the elongation at break of the first elongated nonwoven fabric and the second elongated nonwoven fabric is 80% to 200%; the gram weight of the first elongated nonwoven fabric and the second elongated nonwoven fabric is in the range of 6 to 30 g / m 2 .

[0048] In a preferred embodiment, the preparation method further includes: an expansion and deviation correction step S7: along the MD direction, the expansion and deviation correction step S7 is arranged on the downstream side of the elastic composite material conveying step S6, for expanding and correcting the elastic composite material, and conveying it to the downstream side.

[0049] Another object of the present invention is to provide a method for preparing an elastic composite material, the method comprising:

[0050] First supply step S1: conveying the first elongated nonwoven fabric to the composite step S4 at a first speed V1 along the MD direction;

[0051] Second supply step S2: conveying the second elongated nonwoven fabric to the composite step S4 at a second speed V2 along the MD direction;

[0052] Elastic film supplying step S3: conveying the elastic film to the compounding step S4 at a third speed V3 along the MD direction;

[0053] Compounding step S4: the compounding step S4 is equipped with an ultrasonic heat sealing unit, and the ultrasonic heat sealing unit includes an ultrasonic welding head and an ultrasonic bottom roller which are arranged opposite to each other;

[0054] Wherein, the ultrasonic bottom roller rotates in the circumferential direction at a first linear velocity V4 to compound the elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite semi-finished product in an elastically unactivated or pre-activated state;

[0055] and forming a plurality of joints arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction on the semi-finished elastic composite material;

[0056] The second stretching step S52 is located at the downstream side of the composite step S4. The second stretching step S52 stretches the semi-finished elastic composite material in the CD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole.

[0057] Wherein, the second stretching step S52 is equipped with a CD stretching gear roller device; the CD stretching gear roller device at least includes a third gear roller and a fourth gear roller;

[0058] Wherein, the outer circumference of the third gear roller is provided with a plurality of third teeth and third valleys alternately along the axial direction, and the outer circumference of the fourth gear roller is provided with a plurality of fourth teeth and fourth valleys alternately along the axial direction;

[0059] The third tooth portion and the fourth tooth portion are alternately inserted into the fourth valley portion and the third valley portion without contact with each other to form a working area;

[0060] The third gear roller and the fourth gear roller rotate synchronously in opposite directions along the circumferential direction. When the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the CD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state;

[0061] Wherein, when the third tooth portion and the fourth tooth portion are inserted into the fourth valley portion and the third valley portion alternately without contact with each other, the elastic composite semi-finished product is pressed by the tooth tip of the third tooth portion and the tooth tip of the fourth tooth portion;

[0062] In which, the tooth tip of the third tooth portion is located on the center line of the tooth tips of the two adjacent fourth tooth portions, and the line connecting the tooth tip of the third tooth portion and the tooth tips of the two adjacent fourth tooth portions or the line connecting the tooth tip of the fourth tooth portion and the tooth tips of the two adjacent third tooth portions forms a second insertion angle δ, and the second insertion angle δ is less than 90°.

[0063] Another object of the present invention is to provide an MD stretching gear roller device, the MD stretching gear roller device at least comprising: a first gear roller, a second gear roller and a precision adjustment assembly arranged in parallel along the axial direction, the first gear roller being connected to the precision adjustment assembly; the first gear roller and the second gear roller being configured to rotate synchronously in opposite directions in the circumferential direction;

[0064] Wherein, a plurality of first teeth and first valleys are alternately arranged on the outer circumference of the first gear roller, and a plurality of second teeth and second valleys are alternately arranged on the outer circumference of the second gear roller;

[0065] The first tooth portion of the first gear roller is inserted into the second valley portion of the second gear roller without contact, so as to form a working area for processing the semi-finished elastic composite material;

[0066] Wherein, the precision adjustment assembly comprises a first flange plate arranged along the axial direction, and a first adjustment member connected to the first flange plate, and the first flange plate is connected to the first gear roller;

[0067] The precision adjustment assembly further includes a positioning member, a clamp, a first fixing member, and a second fixing member; the positioning member is connected to the first edge plate along the circumferential direction, the clamp is fixed to the first adjustment member along the circumferential direction, and the positions of the positioning member and the clamp in the circumferential direction correspond to each other;

[0068] The first fixing member and the second fixing member extend into the clamp so that the first fixing member and the second fixing member clamp the positioning member, wherein the first fixing member and the second fixing member are respectively arranged perpendicular to the positioning member;

[0069] By synchronously adjusting the first fixing member and the second fixing member to move in the same direction in the clamp, the positioning member is rotated by a certain angle along with the movement of the first fixing member and the second fixing member;

[0070] The positioning member drives the first edge plate to rotate a certain angle relative to the first adjusting member, so that the first edge plate drives the first gear roller to rotate a certain angle to adjust the phase angle of the first gear roller.

[0071] In a preferred embodiment, the clamp comprises a mounting portion, an opening portion, and ears located at both sides of the opening portion, and the positioning member is disposed in the opening portion and connected to the first edge plate;

[0072] The first fixing member and the second fixing member are respectively installed in the ears located at both sides of the opening; and the first fixing member and the second fixing member extend into the opening so that the first fixing member and the second fixing member clamp the positioning member.

[0073] The above technical solution of the present invention has at least the following beneficial effects compared with the prior art:

[0074] The present invention provides a method for preparing an elastic composite material and an MD stretching gear roller device. In a composite process S4, the gear roller rotates in a circumferential direction at a first linear speed V4 to composite an elastic film between a first stretch non-woven fabric and a second stretch non-woven fabric to form an elastic composite semi-finished product in an elastic non-activated or pre-activated state. In a first stretching process S51, the elastic composite semi-finished product is stretched (stretched) along the MD direction in a manner that a first insertion angle β of a line connecting a first tooth portion and a line connecting two adjacent second tooth portions or a line connecting a second tooth portion and a line connecting two adjacent first tooth portions is less than 90°. In the composite process S4 of the present invention, the elastic film is in a non-stretched state or a slightly stretched state, forming an elastic composite semi-finished product in an elastic non-activated or pre-activated state. By making the first insertion angle β less than 90°, the depth of the first tooth portion inserted into the second valley portion and the second tooth portion inserted into the first valley portion are increased, thereby in the first extension process S51, along the MD direction, increasing the length of the joint portion and the first stretched non-woven fabric and the second stretched non-woven fabric between two adjacent joint portions, so that the length of the first stretched non-woven fabric and the second stretched non-woven fabric between two adjacent joint portions of the elastic composite material in a natural state is shorter than that of the existing elastic composite material, thereby improving the flatness of the surface of the elastic composite material.

[0075] The present invention provides a method for preparing an elastic composite material and an MD stretching gear roller device. In the first stretching process S51, the first insertion angle β is less than 90°, so that the first tooth portion is inserted into the second valley portion and the second tooth portion is inserted into the first valley portion. The depth is increased, so that the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric can be penetrated at the joint to form a through hole, thereby increasing the air permeability of the elastic composite material.

[0076] The present invention provides a method for preparing an elastic composite material and an MD stretching gear roller device. In the first stretching process S51, the first insertion angle β is less than 90°, so that the depth of the first tooth portion inserted into the second valley portion and the second tooth portion inserted into the first valley portion are increased, thereby increasing the elongated length of the first stretch non-woven fabric and the second stretch non-woven fabric (the first stretch non-woven fabric and the second stretch non-woven fabric in the area outside the joint) between two adjacent joints along the MD direction, thereby reducing the bending stiffness of the first stretch non-woven fabric and the second stretch non-woven fabric, making the first stretch non-woven fabric and the second stretch non-woven fabric more fluffy and soft, thereby making the surface of the prepared elastic composite material more fluffy and having better softness.

[0077] The present invention provides a method for preparing an elastic composite material and an MD stretching gear roller device. The prepared elastic composite material comprises a first stretch nonwoven fabric, an elastic film and a second stretch nonwoven fabric which are composited with each other. The elastic composite material has stretchability at least along the MD direction and / or the CD direction, and the elastic composite material has a stretching rebound ratio of at least 100%. When the elastic composite material retracts to a natural state, in an area other than a joint, the elastic composite material is stretched and retracted driven by the rebound force of the elastic film, so that more than 85% of the area of ​​the elastic composite material is flatter (the flatness of the elastic composite material 2 is maintained at 85%). % or more), so that the elastic composite material forms tiny wrinkles that are invisible to the naked eye; in a natural state, the ratio of the width of the joint part to the length of the first elongated non-woven fabric and the second elongated non-woven fabric between two adjacent joints is greater than 2% and less than 15%, and the length of the first elongated non-woven fabric and the second elongated non-woven fabric between two adjacent joints of the prepared elastic composite material in a natural state is shorter than that of the existing elastic composite material, so that more than 85% of the area of ​​the elastic composite material is flatter (the flatness of the elastic composite material 2 is maintained at more than 85%), thereby making the elastic composite material have a higher flatness.

[0078] The present invention provides a method for preparing an elastic composite material and an MD stretching gear roller device. The elastic film around the joint of the prepared elastic composite material is melted to form an opening. At the joint, a first elongated non-woven fabric, an elastic film and a second elongated non-woven fabric are penetrated to form a through hole, thereby increasing the air permeability of the elastic composite material. The air permeability of the elastic composite material is further improved, and the surface of the elastic composite material is more fluffy and has better softness.

[0079] The present invention provides a preparation method of an elastic composite material and an MD stretching gear roller device. The MD stretching gear roller device moves in the same direction in a clamp by synchronously adjusting a first fixing member and a second fixing member of a precision adjustment component, so that a positioning member rotates a certain angle along with the movement of the first fixing member and the second fixing member; the positioning member drives a first edge disk to rotate a certain angle relative to a first adjustment member, so that the first edge disk drives a first gear roller to rotate a certain angle, so as to adjust the phase angle of the first gear roller, thereby ensuring that the first tooth portion is inserted into the second valley portion without contact, and the second tooth portion is inserted into the first valley portion without contact, avoiding collision between the first tooth portion of the first gear roller and the second tooth portion of the second gear roller in the circumferential direction due to phase angle deviation, resulting in damage or even scrapping of the gear roller, reducing the downtime of the gear roller device, and improving the production efficiency of the elastic composite material. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0081] Figure 1 It is a cross-sectional view of the elastic composite material in the prior art when it retracts to its natural state.

[0082] Figure 2 It is a real photograph of the elastic composite material in the prior art retracted to the natural state.

[0083] Figure 3 It is a plan view schematically showing an elastic composite material retracted to a natural state in the first embodiment of the present invention.

[0084] Figure 4 yes Figure 3 Cross-sectional view along the U1-U1 direction.

[0085] Figure 5 This is a photo of an elastic composite material retracted to a natural state in Example 1 of the present invention.

[0086] Figure 6 It is a plan view schematically showing an elastic composite material in a stretched state in the first embodiment of the present invention.

[0087] Figure 7 yes Figure 6 Cross-sectional view along the U2-U2 direction.

[0088] Figure 8 This is a process flow chart of a method for preparing an elastic composite material in Example 1 of the present invention.

[0089] Fig. 9 It is a schematic structural diagram of an ultrasonic heat sealing unit in the first embodiment of the present invention.

[0090] Fig.10 It is a plan view of a semi-finished elastic composite material in the first embodiment of the present invention.

[0091] Fig.11 yes Fig.10 Cross-sectional view along the TT direction.

[0092] Fig.12 It is a schematic structural diagram of the first gear roller and the second gear roller of the MD stretching gear roller device in the first embodiment of the present invention.

[0093] Fig.13 Schematic diagram of the first tooth portion of the first gear roller of the present invention being inserted into the second valley portion of the second gear roller without contact ( Figure 8 (Enlarged view of region I in center).

[0094] Fig.14 is a schematic diagram of the first insertion angle β of the present invention ( Fig.13 (Enlarged view of region II in the middle).

[0095] Fig.15 1 is a cross-sectional comparison diagram of the first elongated nonwoven fabric and the second elongated nonwoven fabric before and after the elongated semi-finished elastic composite material of the present invention, wherein: Fig.15 (a) is a cross-sectional view of the first elongated nonwoven fabric and the second elongated nonwoven fabric before the elastic composite semi-finished product is stretched. Fig.15 (b) is a cross-sectional view of the first stretched nonwoven fabric and the second stretched nonwoven fabric after the elastic composite semi-finished product is stretched.

[0096] Fig.16 It is a structural schematic diagram of an MD stretching gear roller device of the present invention.

[0097] Fig.17 It is a structural schematic diagram of the precision adjustment component of the present invention.

[0098] Fig.18 It is a side view of the precision adjustment assembly of the present invention.

[0099] Fig.19 It is a bottom view of the precision adjustment assembly of the present invention.

[0100] Fig. 20 It is a schematic diagram of a fixture of a precision adjustment assembly of the present invention.

[0101] Fig.21 It is a side view of the connection assembly of the present invention.

[0102] Fig. 22 This is a side view of the first gear roller of the present invention when the phase angle is not adjusted.

[0103] Fig.23 It is a side view of the first gear roller after the phase angle is adjusted according to the present invention.

[0104] Fig.24 It is a process flow chart of a method for preparing an elastic composite material in Embodiment 2 of the present invention.

[0105] Fig.25 It is a schematic structural diagram of the third gear roller and the fourth gear roller of the CD stretching gear roller device in the second embodiment of the present invention.

[0106] Fig.26 Schematic diagram of the third tooth portion of the third gear roller of the present invention being inserted into the fourth valley portion of the fourth gear roller without contact ( Fig.25 (Enlarged view of region III in the figure).

[0107] Fig. 27 It is a process flow chart of a method for preparing an elastic composite material in Embodiment 3 of the present invention. DETAILED DESCRIPTION

[0108] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0109] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0110] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0111] Embodiment 1.

[0112] In order to explain the method for preparing an elastic composite material of the present invention more clearly, it is necessary to explain the elastic composite material prepared by the method for preparing an elastic composite material of the present invention.

[0113] Combination Figures 3 to 7 The elastic composite material 2 has mutually orthogonal MD direction, CD direction and TD direction. The elastic composite material 2 has elasticity along the MD direction and / or CD direction, wherein the MD direction is the process direction of processing the elastic composite material. In this embodiment, the elastic composite material 2 has elasticity along the MD direction, such as Figure 3 and Figure 4 shown.

[0114] like Figure 4As shown, along the TD direction, the elastic composite material 2 includes a first elongated nonwoven fabric 21 , a second elongated nonwoven fabric 22 , and an elastic film 23 sandwiched between the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 .

[0115] The stretch nonwoven fabrics referred to in the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 mean that the nonwoven fabrics will stretch to a certain extent and partially break under the tensile force of the external mechanical force, and the gaps will become larger, and the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 will not shrink after being stretched under the tensile force of the external mechanical force, that is, the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 are nonwoven fabrics with stretchable properties but no elastic shrinkage properties.

[0116] In some embodiments, the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 can be stretch non-woven fabrics containing stretch fibers or stretch resins or made by stretch processes, and the elastic composite material 2 has a stretch rebound ratio of at least 100% (that is, the elastic composite material 2 has at least twice the stretch ratio).

[0117] In some embodiments, the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 have a gram weight of 6 to 30 g / m 2 The elastic film 23 has a gram weight range of 15 to 40 g / m 2 , further, preferably 20 to 40 g / m 2 .

[0118] The elongation at break of the first and second elongation nonwoven fabrics 21 and 22 is smaller than the elongation at break of the elastic film 23 .

[0119] Further, the elongation at break of the first elongation nonwoven fabric 21 and the second elongation nonwoven fabric 22 is 80% to 200%; the elongation at break of the elastic film 23 is 500% or more. Further, preferably, the elongation at break of the first elongation nonwoven fabric 21 and the second elongation nonwoven fabric 22 is 100% to 160%. (Note: Elongation at break, i.e., the ratio of the elongation at break of the sample to the original length of the sample, expressed in %, refer to the national standard GBT 24218.3-2010 Part 3: Determination of breaking strength and elongation at break).

[0120] like Figure 3 As shown, the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 are compounded by a plurality of joint portions 20c arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction, wherein the CD direction is perpendicular to the MD direction.

[0121] For example, the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 are compounded by ultrasonic and hot pressing compounding processes to form a plurality of joint portions 20c arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction.

[0122] Around the joint 20c, the elastic film 23 is melted to form an opening 20a. In the region of the joint 20c, the first stretch nonwoven fabric 21, the elastic film 23, and the second stretch nonwoven fabric 22 are penetrated to form a through hole 20b.

[0123] In addition to the elastic film 23 being melted to form the opening 20a around the joint 20c, the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 are penetrated to form a through hole 20b in the joint 20c area, thereby increasing the air permeability of the elastic composite material 2, and the air permeability of the elastic composite material 2 is further improved.

[0124] It should be noted that the edge of each joining portion 20c has at least an overlapping portion with the edge of each through hole 20b, that is, at least a portion of the joining portion 20c is retained after the through hole 20b is formed in the joining portion 20c, so as to avoid the first stretch non-woven fabric 21, the elastic membrane 23 and the second stretch non-woven fabric 22 being separated from each other after the joining portion 20c is completely penetrated.

[0125] In the present invention, in a natural state, the area outside the joint portion 20c accounts for more than 85% of the total area of ​​the elastic composite material 2.

[0126] In the natural state, the area outside the joint 20c accounts for more than 85% of the total area of ​​the elastic composite material 2, which is determined by the elastic retraction performance (ie, stretching rebound ratio) of the elastic composite material 2 and the pattern distribution area of ​​the joint 20c.

[0127] Generally, when the composite material 2 is in the maximum stretching state, the area distribution ratio of the pattern of the joint 20c will generally not exceed 8%. When it exceeds 8%, on the one hand, it will affect the overall softness of the elastic composite material 2; on the other hand, the larger the area of ​​the joint 20c, the larger the area of ​​the through hole 20b of the elastic composite material 2. The larger the area of ​​the through hole 20b, the more likely it is that the elastic composite material 2 will be put into use on the equipment. The stable operation (for example, the risk of breaking the elastic composite material 2 will increase). When the elastic composite material 2 retracts to the natural state, the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 shrink together by relying on the shrinkage force of the elastic film 23. Although the through hole 20b also shrinks together by relying on the shrinkage force of the elastic film 23, the shrinkage amount of the through hole 20b will be less than the shrinkage amount of the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22. At this time, the area ratio of the joint 20c of the composite material 2 in the natural shrinkage state will increase with the shrinkage.

[0128] Assuming that the pattern area distribution of the joint 20c accounts for 8% when the composite material 2 is in the maximum stretching state, when the elastic composite material 2 is stretched and rebounded at a ratio of 100% (i.e., twice the stretching ratio), the area of ​​the joint 20c of the composite material 2 in the natural contraction state may reach 16%. That is to say, 16% of the joint 20c area may be slightly uneven due to the existence of the joint 20c, but the flatness of the elastic composite material 2 is maintained in the 84% area outside the joint 20c due to the use of the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22, so that more than 84% of the area of ​​the elastic composite material 2 is flatter (the flatness of the elastic composite material 2 is maintained at more than 84%). Taking into account the above factors, in the present invention, in the natural state, the area of ​​the area outside the joint 20c accounts for more than 85% of the total area of ​​the elastic composite material 2, so that more than 85% of the area of ​​the elastic composite material 2 is flatter (the flatness of the elastic composite material 2 is maintained at more than 85%).

[0129] When the elastic composite material 2 shrinks to its natural state, in the area outside the joint 20c, the elastic composite material 2 shrinks driven by the resilience of the elastic film 23, and the through hole 20b also shrinks together due to the contraction force of the elastic film 23. In the natural state, the ratio of the width of the joint 20c to the length of the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 between two adjacent joints 20c is greater than 2% and less than 15%. The expansion and contraction of the elastic composite material 2 along the MD direction forms tiny wrinkles that are invisible to the naked eye, making more than 85% of the area of ​​the elastic composite material 2 flatter (the flatness of the elastic composite material 2 is maintained at more than 85%).

[0130] Specifically, combined Figure 3 and Figure 4In this embodiment, the elastic composite material 2 has stretchability along the MD direction, and the stretchability direction of the elastic composite material 2 is the MD direction.

[0131] When the elastic composite material 2 shrinks to a natural state driven by the elastic film 23, the ratio of the width of the joint 20c to the length of the first and second elongated nonwoven fabrics 21 and 22 between two adjacent joints 20c along the MD direction is greater than 2% and less than 15%.

[0132] In the natural state, the width of the joint 20c is d, the distance between two adjacent joints 20c is D, and the length of the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 between the distance D between two adjacent joints 20c is L, then d / L>2%, and d / L<15%. Therefore, when the elastic composite material 2 is driven by the elastic film 23 to retract to the natural state, along the stretch direction of the elastic composite material 2 (MD direction in this embodiment), the length L of the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 between the distance D between two adjacent joints 20c is shorter (compared with the existing elastic composite material 2, such as Figure 1 As shown), the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 between the two adjacent joints 20c form tiny shrinkage wrinkles invisible to the naked eye, making the surface of the elastic composite material 2 smoother and improving the smoothness of the surface of the elastic composite material 2, as shown in FIG. Figure 3 , Figure 4 and Figure 5 shown.

[0133] When the elastic composite material 2 shrinks to a natural state driven by the elastic film 23, the openings 20a around the joint 20c and the through holes 20b at the joint 20c shrink in the MD direction driven by the elastic film 23, and the through holes 20b are still clearly visible, and the air permeability is strong. Figure 5 shown.

[0134] like Figure 6 and Figure 7 As shown, when the elastic composite material 2 is in the stretched state, the tiny shrinkage wrinkles formed by the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 between two adjacent joints 20c are stretched along the MD direction, the surface of the elastic composite material 2 becomes smoother, the openings 20a located around the joints 20c and the through holes 20b located at the joints 20c are stretched and enlarged along the MD direction, and the air permeability is enhanced.

[0135] Since the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 form tiny shrinkage wrinkles on the surface of the elastic composite material 2, the elastic composite material 2 is made thinner. The thickness of the elastic composite material 2 ranges from 0.5 mm to 2 mm, preferably from 0.5 mm to 1 mm. Compared with the thickness range of 2 mm to 4 mm of the elastic composite material 2 of the prior art wearing article, the elastic composite material 2 prepared by the present invention is thinner, and the wearing article prepared by the elastic composite material 2 is thinner and comfortable to wear, and does not feel bloated. In addition, the elastic composite material 2 has two openings, the opening 20a and the through hole 20b, so that the elastic composite material 2 has higher air permeability, which overcomes the problem of poor air permeability of the existing elastic composite material 2 (only having the opening 20a).

[0136] In order to prepare the elastic composite material 2 with a smoother surface and enhanced air permeability, the present invention provides a method for preparing the elastic composite material.

[0137] like Figure 8 As shown, according to an embodiment of the present invention, a method for preparing an elastic composite material is provided, comprising:

[0138] First supply step S1: The first stretch nonwoven fabric 21 is fed to the composite step S4 at a first speed V1 along the MD direction.

[0139] The MD direction of the present invention corresponds to the process direction when the production equipment is operating normally, and the CD direction corresponds to the direction perpendicular to the process direction.

[0140] Specifically, the first supply process S1 is equipped with a first driving roller E1, which rotates in the circumferential direction at a linear speed V1. After the first elongated nonwoven fabric 21 is unwound, it is guided to the first driving roller E1 along the MD direction under the guidance of a plurality of free rollers D. The first driving roller E1 rotates in the circumferential direction at a linear speed V1, driving the first elongated nonwoven fabric 21 to be transported to the compounding process S4 at a first speed V1.

[0141] The first driving roller E1 is connected to a motor (not shown), and the first driving roller E1 is driven by the motor to rotate along the circumferential direction at a linear speed V1.

[0142] Second supply step S2: The second stretch nonwoven fabric 22 is fed to the composite step S4 at a second speed V2 along the MD direction.

[0143] Specifically, the second supply process S2 is equipped with a second driving roller E2, which rotates in the circumferential direction at a linear speed V2. After the second elongated nonwoven fabric 22 is unwound, it is guided to the second driving roller E2 along the MD direction under the guidance of a plurality of free rollers D, and the second driving roller E2 rotates in the circumferential direction at a linear speed V2, driving the second elongated nonwoven fabric 22 to be transported to the compounding process S4 at a second speed V2.

[0144] The second driving roller E2 is connected to a motor (not shown), and the second driving roller E2 is driven by the motor to rotate along the circumferential direction at a linear speed V2.

[0145] Elastic film supplying step S3: The elastic film 23 is conveyed to the compounding step S4 at a third speed V3 along the MD direction. Figure 8 shown.

[0146] Specifically, the elastic film supplying step S3 is equipped with a third driving roller E3, which rotates in the circumferential direction at a linear speed V3. After the elastic film 23 is unwound, it is guided to the third driving roller E3 along the MD direction under the guidance of a plurality of free rollers D. The third driving roller E3 rotates in the circumferential direction at a linear speed V3, driving the elastic film 23 to be transported to the compounding step S4 at a third speed V3.

[0147] The third driving roller E3 is connected to a motor (not shown), and the third driving roller E3 is driven by the motor to rotate along the circumferential direction at a linear speed V3.

[0148] Composite step S4: The composite step S4 is used to composite the elastic film 23 between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 to form an elastic composite semi-finished product 2P in an elastic unactivated or pre-activated state.

[0149] According to an embodiment of the present invention, the compounding step S4 is equipped with an ultrasonic heat sealing unit H, which includes an ultrasonic horn H1 and an ultrasonic bottom roller H2 arranged opposite to each other. The ultrasonic bottom roller H2 rotates along the circumferential direction at a first linear velocity V4.

[0150] According to an embodiment of the present invention, the first speed V1, the second speed V2 and the first linear speed V4 are equal, that is, V1 = V2 = V4.

[0151] According to an embodiment of the present invention, the ultrasonic bottom roller H2 rotates in the circumferential direction at a first linear velocity V4, and the elastic film 23 is compounded between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 to form an elastic composite semi-finished product 2P in an elastic unactivated or pre-activated state.

[0152] In some embodiments, the first line speed V4 is less than or equal to 1.25 times the third speed V3, so that the elastic film 23 is in an unstretched state or a slightly stretched state and is compounded between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 to form an elastic composite material semi-finished product 2P in an elastic unactivated state or an elastic pre-activated state.

[0153] The elastic unactivated state of the present invention means that the elastic composite semi-finished product 2P has no stretch rebound ratio (no stretchability); the elastic pre-activated state means that the elastic composite semi-finished product 2P has a certain stretch rebound ratio (lower stretchability), but has not yet reached the stretch rebound ratio of the elastic composite material 2.

[0154] In some preferred embodiments, the first linear velocity V4 is less than or equal to the third velocity V3, and the elastic film 23 is compounded between the first elongated non-woven fabric 21 and the second elongated non-woven fabric 22. The first linear velocity V4 is less than or equal to the third velocity V3, so that the elastic film 23 is completely in a non-stretched state and compounded between the first elongated non-woven fabric 21 and the second elongated non-woven fabric 22, forming an elastic composite semi-finished product 2P in an elastically inactivated state, which is more conducive to the subsequent first stretching process S51, the depth of the first tooth portion M11 inserted into the second valley portion M22 / the second tooth portion M21 inserted into the first valley portion M12 (the first stretching process S51 is described in detail below).

[0155] In the composite step S4 of the present invention, the elastic film 23 is composited between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 by the ultrasonic heat sealing unit H to form an elastic composite semi-finished product 2P in an elastic non-activated or pre-activated state, so that the elastic composite semi-finished product 2P forms a plurality of joints 20c arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction, such as Fig.10 and Fig.11 shown.

[0156] Specifically, combined Figure 8 , Fig. 9 , Fig.10 and Fig.11 The axial direction of the ultrasonic horn H1 and the ultrasonic bottom roller H2 is parallel to the CD direction. On the surface of the ultrasonic bottom roller H2, a plurality of convex portions H21 arranged at intervals along the circumferential direction of the ultrasonic bottom roller H2 are provided. The first elongated non-woven fabric 21, the second elongated non-woven fabric 22 and the elastic film 23 are mutually welded on the convex portions H21 to form a plurality of joint portions 20c, as shown in FIG. Fig. 9 shown.

[0157] When the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 pass between the convex portion H21 of the ultrasonic bottom roller H2 and the ultrasonic horn H1, the ultrasonic horn H1 imparts vibration energy, and the ultrasonic horn H1 performs ultrasonic vibration in the direction of the ultrasonic bottom roller H2. Ultrasonic welding is performed between the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 on multiple convex portions H21, and the elastic film 23 is compounded between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 to form an elastic composite material semi-finished product 2P in an elastically unactivated or pre-activated state.

[0158] The elastic composite semi-finished product 2P is formed into a plurality of joints 20c arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction, and the elastic film 23 is melted around the joints 20c to form openings 20a, such as Fig.10 and Fig.11 In some embodiments, the surrounding elastic film 23 of the joint portion 20c is not melted, so that the opening 20a is not formed.

[0159] The shape of the convex portion H21 of the ultrasonic bottom roller H2 of the present invention is not specifically limited. The convex portion H21 has a rectangular shape or an oblong shape extending in the axial direction (corresponding to the CD direction) of the ultrasonic bottom roller H2. The shape of the exemplary convex portion H21 in this embodiment is a rectangular shape, thereby forming a rectangular-shaped joint portion 20c, such as Fig.10 In some embodiments, other shapes are also possible to form the engaging portion 20c of different shapes.

[0160] The first stretching step S51 is located at the downstream side of the composite step S4. The first stretching step S51 stretches (stretches) the elastic composite semi-finished product 2P along the MD direction, and penetrates the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 at the joint 20c to form a through hole 20b.

[0161] In this embodiment, the elastic composite semi-finished product 2P is only extended (stretched) along the MD direction, that is, in this embodiment, only the first extending step S51 is provided.

[0162] Combination Figure 8 , Fig.12 , Fig.13 and Fig.14 According to an embodiment of the present invention, the first stretching process S51 is configured with an MD stretching gear roller device M. The MD stretching gear roller device M at least includes a first gear roller M1 and a second gear roller M2, which are arranged in parallel along the axial direction (CD direction).

[0163] The outer circumference of the first gear roller M1 is provided with a plurality of first teeth M11 and first valleys M12 alternately along the circumferential direction, and the outer circumference of the second gear roller M2 is provided with a plurality of second teeth M21 and second valleys M22 alternately along the circumferential direction. The first teeth M11 are inserted into the second valleys M22 without contact, and the second teeth M21 are inserted into the first valleys M12 without contact. The first teeth M11 and the second teeth M21 are inserted into the second valleys M22 and the first valleys M1 alternately without contact with each other, forming a working area, such as Fig.12 , Fig.13 and Fig.14 shown.

[0164] According to an embodiment of the present invention, the first gear roller M1 and the second gear roller M2 rotate synchronously in opposite directions along the circumferential direction at a second linear speed V5. When the elastic composite semi-finished product 2P passes through the working area, the elastic composite semi-finished product 2P is extended along the MD direction, and the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 are penetrated at the joint 20c to form a through hole 20b, thereby forming an elastic composite material 2 in an elastically activated state.

[0165] The elastically activated state of the present invention means that the elastic composite material 2 has a stretching rebound ratio of at least 100% (ie, the elastic composite material 2 has a stretching ratio of at least twice).

[0166] By inserting the first tooth portion M11 into the second valley portion M22 without contact and inserting the second tooth portion M21 into the first valley portion M12 without contact, the elastic composite semi-finished product 2P is extended (stretched) along the MD direction, and the joint portion 20c and the first elongated non-woven fabric 21 and the second elongated non-woven fabric 22 between two adjacent joint portions 20c are extended along the MD direction to form an elastic composite material 2 in an elastically activated state, such as Figure 8 , Fig.13 and Fig.14 shown.

[0167] According to an embodiment of the present invention, when the first tooth portion M1 and the second tooth portion M21 are inserted into the second valley portion M22 and the first valley portion M12 alternately without contact with each other, the elastic composite semi-finished product 2P is pressed by the tooth tip of the first tooth portion M11 and the tooth tip of the second tooth portion M21, and on the connecting line O1-O2 of the axis O1 of the first gear roller M1 and the axis O2 of the second gear roller M2, the tooth tip of the first tooth portion M11 and the connecting line of the tooth tips of the two adjacent second tooth portions M21 or the connecting line of the tooth tip of the second tooth portion M21 and the tooth tips of the two adjacent first tooth portions M11 form a first insertion angle β, and the first insertion angle β is less than 90°, as shown in FIG. Fig.14 shown.

[0168] Specifically, as the first gear roller M1 and the second gear roller M2 rotate synchronously in opposite directions along the circumferential direction, the depth of the first tooth portion M11 inserted into the second valley portion M22 first increases and then decreases, and the depth of the second tooth portion M21 inserted into the first valley portion M12 first increases and then decreases.

[0169] When the first tooth portion M11 is inserted into the second valley portion M22 and is in the deepest state (the tooth tip of the first tooth portion M11 is on the line O1-O2 connecting the axis O1 of the first gear roller M1 and the axis O2 of the second gear roller M2), the tooth tip of the first tooth portion M11 and the line connecting the tooth tips of two adjacent second tooth portions M21 form a first insertion angle β, and the first insertion angle β is less than 90°. Fig.14 .

[0170] Furthermore, the connecting lines between the tooth tips of the adjacent second tooth portions M21 and the connecting lines between the tooth tips of the adjacent second tooth portions M21 and the tooth tips of the first tooth portions M11 respectively form a triangular area Y (see Fig.14 The shaded area) is an acute triangle.

[0171] When the second tooth portion M21 is inserted into the first valley portion M12 and is in the deepest state (the tooth tip of the second tooth portion M21 is on the line O1-O2 connecting the axis O1 of the first gear roller M1 and the axis 02 of the second gear roller M2), the tooth tip of the second tooth portion M21 and the line connecting the tooth tips of the two adjacent first tooth portions M11 form a first insertion angle β, and the first insertion angle β is less than 90°.

[0172] Furthermore, the triangular area Y formed by the connecting lines between the tooth tips of the adjacent first tooth portions M11 and the connecting lines between the tooth tips of the adjacent first tooth portions M11 and the tooth tips of the second tooth portions M21 is an acute triangle.

[0173] When the first tooth portion M11 of the present invention is inserted into the second valley portion M22 at the deepest state, the depth of the first tooth portion M11 inserted into the second valley portion M22 is the same as the depth of the second tooth portion M21 inserted into the first valley portion M12 when the second tooth portion M21 is inserted into the first valley portion M12 at the deepest state, both of which are R (unit: mm). Fig.13 and Fig.14 .

[0174] like Figure 8 As shown, the elastic composite semi-finished product 2P is transported along the MD to the MD stretching gear roller device M, and enters the MD stretching gear roller device M through the gap between the first gear roller M1 and the second gear roller M2. The first gear roller M1 and the second gear roller M2 rotate synchronously in opposite directions along the circumferential direction at a second linear speed V5, and the first tooth portion M11 is inserted into the second valley portion M22 and the second tooth portion M21 is inserted into the first valley portion M12, so that the elastic composite semi-finished product 2P is extended (stretched) along the MD direction, and the joint 20c, the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 between the two adjacent joints are extended along the MD direction to form an elastic composite material 2.

[0175] In the compounding step S4 of the present invention, the elastic film 23 is compounded between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 to form an elastic composite semi-finished product 2P in an elastic non-activated or pre-activated state. In the first extension step S51, the first insertion angle β formed by the line connecting the tooth tip of the first tooth portion M11 and the tooth tips of the two adjacent second tooth portions M21 or the line connecting the tooth tip of the second tooth portion M21 and the tooth tips of the two adjacent first tooth portions M11 is less than 90°, so that the depth of the first tooth portion M11 inserted into the second valley portion M22 / the second tooth portion M21 inserted into the first valley portion M12 is increased, thereby increasing the length of the joint portion 20c and the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 extended along the MD direction.

[0176] Since the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 will not shrink after being stretched under the tensile force of the mechanical external force, while the elastic film 23 will shrink after being stretched, the elastic composite material 2 finally formed forms tiny shrinkage wrinkles invisible to the naked eye in the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 between two adjacent joints 20c in the MD direction in a natural state. This replaces the elastic composite material 2 formed by pulling the elastic film 23 at a higher speed by the first linear speed V4 in the prior art, so that the elastic film 23 is in an elongated state and enters the ultrasonic heat sealing unit H, and forms a plurality of large shrinkage wrinkles with convex and concave structures in the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 between two adjacent joints 20c in the MD direction in a natural state.

[0177] In the first extension process S51, the present invention increases the insertion depth of the first tooth portion M11 into the second valley portion M22 and the insertion depth of the second tooth portion M21 into the first valley portion M12 by forming a first insertion angle β less than 90° through a line connecting the tooth tip of the first tooth portion M11 and the tooth tips of two adjacent second tooth portions M21 or a line connecting the tooth tip of the second tooth portion M21 and the tooth tips of two adjacent first tooth portions M11, thereby increasing the extension length of the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 between two adjacent joints 20c along the MD direction, thereby forming tiny shrinkage wrinkles invisible to the naked eye on the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 between two adjacent joints 20c along the MD direction of the elastic composite material 2. The length of the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 between two adjacent joints 20c of the prepared elastic composite material 2 in a natural state is shorter than that of the existing elastic composite material 2, thereby improving the flatness of the surface of the elastic composite material 2.

[0178] In some embodiments, the first insertion angle β ranges from 30° to 85°, thereby increasing the elongated length of the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22, so that the required stretch ratio (expansion ratio) of the elastic composite material 2 is within a reasonable expansion range.

[0179] According to an embodiment of the present invention, a plurality of first tooth portions M11 and a plurality of second tooth portions M21 extend respectively along the axial direction of the MD stretching gear roller device (the axial direction of the first gear roller M1 and the axial direction of the second gear roller M2, CD direction), and when the elastic composite semi-finished product 2P passes through the working area of ​​the first stretching process S51, the first tooth portions M11 and the second tooth portions M21 respectively correspond at least partially to the joining portions of the elastic composite semi-finished product 2P.

[0180] In the first stretching step S51, the first tooth portion M11 is inserted into the second valley portion M22 without contact, and the second tooth portion M21 is inserted into the first valley portion M12 without contact. In the joint portion 20c area, the first stretch non-woven fabric 21, the elastic membrane 23 and the second stretch non-woven fabric 22 are penetrated to form a through hole 20b. In the area outside the joint portion 20c, the elastic composite material semi-finished product 2P is extended as a whole in the MD direction.

[0181] Since the joint portion 20c is formed by welding through the ultrasonic heat sealing unit H in the composite step S4, the first stretch non-woven fabric 21, the elastic membrane 23 and the second stretch non-woven fabric 22 are relatively brittle. In the first extension step S51, the tooth tip of the first tooth portion M11 and the tooth tip of the two adjacent second tooth portions M21 or the tooth tip of the second tooth portion M21 and the tooth tip of the two adjacent first tooth portions M11 form a first insertion angle β less than 90°, so that the depth of the first tooth portion M11 inserted into the second valley portion M22 / the second tooth portion M21 inserted into the first valley portion M12 is increased, thereby penetrating the first stretch non-woven fabric 21, the elastic membrane 23 and the second stretch non-woven fabric 22 to form a through hole 20b.

[0182] Since the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 (the area outside the joining portion 20c) between two adjacent joining portions 20c along the MD direction have not been welded by the ultrasonic heat sealing unit H, the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 have relatively large toughness. In the first stretching step S51, the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 will not be penetrated, and only the joining portion 20c and the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 between two adjacent joining portions 20c (the first stretch nonwoven fabric 21 and the second stretch nonwoven fabric 22 in the area outside the joining portion 20c) are stretched along the MD direction.

[0183] In the first stretching step S51, the first tooth portion M11 is inserted into the second valley portion M22 without contact, and the second tooth portion M21 is inserted into the first valley portion M12 without contact. At the joint portion 20c, the first stretch non-woven fabric 21, the elastic membrane 23 and the second stretch non-woven fabric 22 are penetrated to form a through hole 20b, thereby making the prepared elastic composite material 2 highly breathable.

[0184] In the first extending process S51 of the present invention, the first insertion angle β formed by the line connecting the tooth tip of the first tooth portion M11 and the tooth tips of two adjacent second tooth portions M21 or the line connecting the tooth tip of the second tooth portion M21 and the tooth tips of two adjacent first tooth portions M11 is less than 90°, so that the insertion depth of the first tooth portion M11 into the second valley portion M22 / the insertion depth of the second tooth portion M21 into the first valley portion M12 is increased (relative to the insertion depth in the prior art), and the extended length of the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 between two adjacent joining portions 20c along the MD direction is increased (relative to the extended (stretched) length in the prior art), thereby reducing the bending stiffness of the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22, making the first stretched non-woven fabric 21 and the second stretched non-woven fabric 22 more fluffy and soft, thereby making the surface of the prepared elastic composite material 2 more fluffy and having better softness.

[0185] like Fig.15 As shown, the cross-sections of the first elongated nonwoven fabric 21 and the second elongated nonwoven fabric 22 are compared before and after the elastic composite semi-finished product 2P is extended (stretched). Fig.15 (a) is a cross-sectional view of the first elongated nonwoven fabric 21, the elastic film 23 and the second elongated nonwoven fabric 22 before the elastic composite semi-finished product 2P is stretched. Fig.15 (b) is a cross-sectional view of the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 after the elastic composite semi-finished product 2P is stretched.

[0186] Depend on Fig.15 It can be seen that before the elastic composite semi-finished product 2P is extended (stretched) by the first extension process S51 of the present invention, the first extension non-woven fabric 21 and the second extension non-woven fabric 22 are relatively dense, have strong bending rigidity, and are not soft enough. After the elastic composite semi-finished product 2P is extended (stretched) by the first extension process S51 of the present invention, due to the increase in the depth of the first tooth portion M11 inserted into the second valley portion M22 and the second tooth portion M21 inserted into the first valley portion M12, the first extension non-woven fabric 21 and the second extension non-woven fabric 22 are relatively fluffy, have reduced bending rigidity, and are softer.

[0187] Back to Figure 8 According to an embodiment of the present invention, the first linear velocity V4 of the ultrasonic bottom roller H2 rotating along the circumferential direction is greater than or equal to the second linear velocity V5 of the first gear roller M1 and the second gear roller M2 rotating synchronously and oppositely along the circumferential direction, that is, V4 ≥ V5, thereby ensuring that there is a certain buffer between the first gear roller M1, the second gear roller M2 and the elastic composite material 2, without relative sliding, making it easier to shape the through hole 20b, and preventing the through hole 20b from being unclear due to the excessive rotation speed of the first gear roller M1 and the second gear roller M2, or the elastic composite material 2 from being torn at the through hole 20b.

[0188] In a preferred embodiment, the first linear velocity V4 is equal to 1.2 to 1.6 times of the second linear velocity V5, preferably V4=1.5*V5, which depends on the elongation characteristics of the first elongation nonwoven fabric 21 and the second elongation nonwoven fabric.

[0189] Further, according to an embodiment of the present invention, at least one of the first gear roller M1 and the second gear roller M2 is provided with a gear roller heater (not shown in the figure) for heating the first gear roller M1 and / or the second gear roller M2, thereby heating the elastic composite semi-finished product 2P of the MD stretching gear roller device M transported to the first stretching process S51, so that during the stretching process of the elastic composite semi-finished product 2P along the MD direction, the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 between two adjacent joints 20c along the MD direction are more easily stretched, and the stretchability of the prepared elastic composite material 2 can also be improved.

[0190] Elastic composite material conveying step S6: along the MD direction, the elastic composite material conveying step S6 is arranged at the downstream side of the first stretching step S51 and / or the second stretching step S52, and is used to clamp the elastic composite material 2 and convey it to the downstream side.

[0191] In this embodiment, only the first stretching step S51 is provided, and the elastic composite material conveying step S6 is arranged at the downstream side of the first stretching step S51 for clamping the elastic composite material 2 and conveying it to the downstream side.

[0192] According to an embodiment of the present invention, the elastic composite material conveying step S6 is equipped with a conveying roller device K1. The conveying roller device K1 at least includes a conveying roller K11 and a clamping roller K12. The conveying roller K11 and the clamping roller K12 are arranged opposite to each other, and the conveying roller K11 rotates in the circumferential direction at a third linear speed V6, and the clamping roller K12 and the conveying roller K11 clamp the elastic composite material 2 and convey it to the downstream side.

[0193] Specifically, the conveying roller K11 is an active roller, which rotates in the circumferential direction at a third linear speed V6 under the drive of a motor (not shown in the figure), and the clamping roller K12 is a driven roller. The conveying roller K11 and the clamping roller K12 clamp the elastic composite material 2 and convey it to the downstream side.

[0194] The third linear velocity V6 of the conveying roller K11 rotating in the circumferential direction is greater than the second linear velocity V5 of the first gear roller and the second gear roller rotating synchronously in opposite directions in the circumferential direction, that is, V6>V5.

[0195] The elastic composite material 2 is clamped by the conveying roller K11 and the clamping roller K12 and the third linear velocity V6 is greater than the second linear velocity V5, so that the elastic composite material 2 is conveyed to the downstream side with a greater tension, further extending (stretching) the elastic composite material 2, improving the elasticity of the elastic composite material 2, and making the opening area of ​​the through hole 2b larger and clearer, and the air permeability and elasticity of the elastic composite material 2 better.

[0196] In a preferred embodiment, the third linear velocity V6 is greater than or equal to 1.2 times the second linear velocity V5.

[0197] Width expansion and deviation correction step S7: Along the MD direction, the width expansion and deviation correction step S7 is arranged at the downstream side of the elastic composite material conveying step S6, and is used to expand and correct the elastic composite material 2, and convey it to the downstream side.

[0198] The elastic composite material 2 is prevented from shrinking along the CD direction by the width-expanding and deviation-correcting step S7. After the width-expanding and deviation-correcting step S7, the elastic composite material 2 is continuously conveyed to the downstream side for subsequent processing.

[0199] In the first extension process S51, the present invention increases the insertion depth of the first tooth portion M11 into the second valley portion M22 / the insertion depth of the second tooth portion M21 into the first valley portion M12 by forming a first insertion angle β less than 90° through a line connecting the tooth tip of the first tooth portion M11 and the tooth tips of two adjacent second tooth portions M21 or a line connecting the tooth tip of the second tooth portion M21 and the tooth tips of two adjacent first tooth portions M11, so as to achieve a smoother surface, stronger air permeability, more fluffiness and softness of the prepared elastic composite material 2.

[0200] However, when the depth of the first tooth portion M11 inserted into the second valley portion M22 / the second tooth portion M21 inserted into the first valley portion M12 increases, and the phase angle of the first gear roller M1 (second gear roller M2) in the circumferential direction deviates from the phase angle of the second gear roller M2 (first gear roller M1) in the circumferential direction, the phase angles of the first tooth portion M11 and the second tooth portion M21 in the circumferential direction may easily collide, causing damage to or even scrapping of the first gear roller M1 or the second gear roller M2, so that the disposable sanitary products equipment has to be shut down, affecting production.

[0201] In order to solve the above technical problems, combined Fig.12 , Fig.13 , Figures 16 to 23 According to an embodiment of the present invention, an MD stretching gear roller device M is provided. Fig.16 As shown, the MD stretching gear roller device M includes a first gear roller M1, a second gear roller M2 and a precision adjustment component 5 which are arranged in parallel along the axial direction.

[0202] The MD stretching gear roller device M further includes a frame 4 , a connecting assembly 10 , a first coupling 6 , a first driving shaft 7 , a second coupling 9 , a second driving shaft 8 and a driving assembly 11 .

[0203] The first shaft sleeve 3a and the second shaft sleeve 3b are installed on the frame 4. The first gear roller M1 is installed on the first shaft sleeve 3a through a bearing, and the second gear roller M2 is installed on the second shaft sleeve 3b through a bearing.

[0204] Along the axial direction (CD direction), the first gear roller M1 is connected to the precision adjustment component 5, the first connecting piece 6 is connected to the precision adjustment component 5, one end of the first driving shaft 7 is connected to the first connecting piece 6, and the other end of the first driving shaft 7 is connected to the driving component 11.

[0205] Along the axial direction (CD direction), the connecting component 10 is connected to the second gear roller M2, the second connecting piece 9 is connected to the connecting component 10, one end of the second driving shaft 8 is connected to the second connecting piece 9, and the other end of the second driving shaft 8 is connected to the driving component 11.

[0206] The driving assembly 11 drives the first driving shaft 7 and the second driving shaft 8 to rotate synchronously in opposite directions, thereby driving the first gear roller M1 and the second gear roller M2 to rotate synchronously in opposite directions.

[0207] Specifically, the driving assembly 11 includes a first transmission wheel 11a, a second transmission wheel 11b and a third transmission wheel 11c. The first transmission wheel 11a is connected to the first driving shaft 7, and the second transmission wheel 11b is connected to the second driving shaft 8.

[0208] The first transmission wheel 11a and the second transmission wheel 11b are meshed with each other, the first transmission wheel 11a is connected to the third transmission wheel 11c through the first drive shaft 7, or the second transmission wheel 11b is connected to the third transmission wheel 11c through the second drive shaft 8, and the third transmission wheel 11c is connected to a driving source (such as a motor, not shown in the figure). In this embodiment, the second transmission wheel 11b is connected to the third transmission wheel 11c through the second drive shaft 8.

[0209] Driven by a driving source (such as a motor), the third transmission wheel 11c drives the first transmission wheel 11a and the second transmission wheel 11b to rotate synchronously in the opposite direction, thereby driving the first drive shaft 7 and the second drive shaft 8 to rotate synchronously in the opposite direction, and driving the first gear roller M1 and the second gear roller M2 to rotate synchronously in opposite directions in the circumferential direction.

[0210] The outer circumference of the first gear roller M1 is alternately provided with a plurality of first teeth M11 and first valleys M12, and the outer circumference of the second gear roller M2 is alternately provided with a plurality of second teeth M21 and second valleys M22. The first teeth M11 of the first gear roller M1 is inserted into the second valleys M22 of the second gear roller M2 without contact, so as to form a working area for processing the semi-finished elastic composite material 2P. Fig.13shown.

[0211] The first gear roller M1 and the second gear roller M2 are configured to rotate synchronously in opposite directions in the circumferential direction. When the first gear roller M1 and the second gear roller M2 rotate synchronously in opposite directions in the circumferential direction, the elastic composite semi-finished product 2P is transported along the transport direction and supplied to the working areas of the first gear roller M1 and the second gear roller M2. The elastic composite semi-finished product 2P is contacted and pressed by the tooth tips of the first tooth portion M11 and the tooth tips of the second tooth portion M21, so that the elastic composite semi-finished product 2P is extended (stretched), as shown in FIG. Fig.13 shown.

[0212] In order to ensure the effect of the extension (stretching) processing of the elastic composite semi-finished product 2P, the depth of the first tooth portion M11 inserted into the second valley portion M22 without contact and the depth R of the second tooth portion M21 inserted into the first valley portion M12 without contact can be adjusted as needed, and the specific adjustment process is described in detail in the following embodiments.

[0213] Since the first tooth portion M11 of the present invention is inserted into the second valley portion M22 without contact and the second tooth portion M21 is inserted into the first valley portion M12 without contact, the depth increases. When the phase angle of the first gear roller M1 in the circumferential direction deviates from the phase angle of the second gear roller M2 in the circumferential direction, it is easy for the first tooth portion M11 of the first gear roller M1 to collide with the second tooth portion M21 of the second gear roller M2 in the circumferential direction, causing the first gear roller M1 and / or the second gear roller M2 to be damaged or even scrapped, so that the disposable sanitary product equipment can only be shut down, affecting production. Therefore, the adjustment accuracy of the circumferential phase angle of the first gear roller M1 or the second gear roller M2 is particularly important.

[0214] In order to improve the adjustment accuracy of the circumferential phase angle of the first gear roller M1 or the second gear roller M2, the first gear roller M1 of the present invention is connected to the first connecting member 6 via a precision adjustment component 5, and the phase angle of the first gear roller M1 is adjusted via the precision adjustment component 5, thereby adjusting the deviation of the phase angle of the first gear roller M1 in the circumferential direction relative to the phase angle of the second gear roller M2 in the circumferential direction, thereby avoiding collision between the first tooth portion M11 of the first gear roller M1 and the second tooth portion M21 of the second gear roller M2 in the circumferential direction.

[0215] Specifically, combined Figures 16 to 20 The precision adjustment assembly 5 includes a first flange disc 5a arranged along the axial direction, and a first adjustment member 5b connected to the first flange disc 5a.

[0216] The first edge plate 5a is connected to the first gear roller M1, so that the first gear roller M1 is connected to the precision adjustment component 5, and the first connecting member 6 is connected to the first adjusting member 5b of the precision adjustment component 5, so that the first connecting member 6 is connected to the precision adjustment component 5. Fig.17 shown.

[0217] like Fig.18 As shown, the end surface of the first flange plate 5a has a plurality of first mounting holes 5a1 distributed along the circumferential direction. The end surface of the first adjusting member 5b has a plurality of first mounting grooves 5b1 distributed along the circumferential direction. The positions of the first mounting holes 5a1 and the first mounting grooves 5b1 along the circumferential direction correspond to each other. The first flange plate 5a is connected to the first adjusting member 5b by inserting bolts into the first mounting grooves 5b1 and the first mounting holes 5a1.

[0218] Combination Figures 17 to 20 The precision adjustment assembly 5 further includes a positioning member 5d, a clamp 5c, a first fixing member 5e and a second fixing member 5f. The positioning member 5d is connected to the first flange 5a along the circumferential direction, and the clamp 5c is fixed to the first adjustment member 5b along the circumferential direction. The positions of the positioning member 5d and the clamp 5c in the circumferential direction correspond to each other.

[0219] The first fixing member 5e and the second fixing member 5f extend into the clamp 5c so that the first fixing member 5e and the second fixing member 5f clamp the positioning member 5d, and the first fixing member 5e and the second fixing member 5f are respectively arranged perpendicular to the positioning member 5d.

[0220] Specifically, the first edge plate 5a is provided with a positioning hole 5a2, and the positioning member 5d is inserted into the positioning hole 5a2, so that the positioning member 5d is connected to the first edge plate 5a along the circumferential direction. Fig.18 and Fig.19 shown.

[0221] like Fig. 20 As shown, the clamp 5c is a "U"-shaped structure, including a mounting portion 5c1, an opening portion 5c2, and ears 5c3 located on both sides of the opening portion 5c2, and a positioning member 5d is arranged in the opening portion 5c2 and connected to the first flange 5a. The clamp 5c is fixed to the first adjusting member 5b along the circumferential direction through the mounting portion 5c1.

[0222] The first fixing member 5e and the second fixing member 5f are respectively installed in the ear portions 5c3 on both sides of the opening 5c2, and the first fixing member 5e and the second fixing member 5f extend into the opening 5c2 so as to clamp the positioning member 5d.

[0223] Specifically, screw holes extending axially along the first fixing member 5e and the second fixing member 5f are provided in the ears 5c3 on both sides of the opening 5c2, and the first fixing member 5e and the second fixing member 5f are installed in the screw holes provided in the ears 5c3 on both sides of the opening 5c2.

[0224] Combination Fig. 22 and Fig.23When the phase angle of the first gear roller M1 needs to be adjusted, the connection between the first flange plate 5a and the first adjusting member 5b is loosened, that is, the bolts inserted into the first mounting hole 5a1 and the first mounting groove 5b1 are loosened.

[0225] By synchronously adjusting the first fixing member 5e and the second fixing member 5f to move in the same direction in the ear portion 5c3, the positioning member 5d is rotated by a certain angle along with the movement of the first fixing member 5e and the second fixing member 5f.

[0226] Specifically, the first fixing member 5e and the second fixing member 5f are rotated and screwed in the screw hole by a tool, so that the first fixing member 5e and the second fixing member 5f move in the same direction. In this embodiment, the first fixing member 5e and the second fixing member 5f are screws, and the size of the screw hole opened in the ear portion 5c3 corresponds to that of the screw hole.

[0227] When the first fixing member 5e and the second fixing member 5f move in the same direction, if the first fixing member 5e moves toward the inside of the opening 5c2, the second fixing member 5f moves toward the outside of the opening 5c2; if the first fixing member 5e moves toward the outside of the opening 5c2, the second fixing member 5f moves toward the inside of the opening 5c2, thereby causing the positioning member 5d to rotate a certain angle along with the movement of the first fixing member 5e and the second fixing member 5f.

[0228] The positioning member 5d drives the first rim plate 5a to rotate a certain angle relative to the first adjusting member 5b, so that the first rim plate 5a drives the first gear roller M1 to rotate a certain angle, adjusts the phase angle of the first gear roller M1, and thereby adjusts the deviation of the phase angle of the first gear roller M1 in the circumferential direction relative to the phase angle of the second gear roller M2 in the circumferential direction, avoids the collision between the first tooth portion M11 of the first gear roller M1 and the second tooth portion M21 of the second gear roller M2 in the circumferential direction, and makes the first tooth portion M11 inserted into the second valley portion M22 without contact, and the second tooth portion M21 inserted into the first valley portion M12 without contact.

[0229] In order to quickly and accurately adjust the phase angle of the first gear roller M1, the pitch value L' (unit: mm) of the first fixing member 5e and the second fixing member 5f can be preset. The first fixing member 5e and the second fixing member 5f rotate one circle respectively, and the stroke of the first fixing member 5e and the second fixing member 5f moving in the same direction is the pitch value L', and the positioning member 5d rotates with the first fixing member 5e and the second fixing member 5f moving in the same direction. Fig. 22 shown.

[0230] like Fig.23As shown, the positioning member 5d rotates along with the first fixing member 5e and the second fixing member 5f moving in the same direction, driving the first flange plate 5a to rotate at an angle b relative to the first adjusting member 5b, so that the first flange plate 5a drives the first gear roller M1 to rotate at an angle b, and adjusts the phase angle of the first gear roller M1, thereby adjusting the deviation of the phase angle of the first gear roller M1 in the circumferential direction relative to the phase angle of the second gear roller M2 in the circumferential direction, avoiding the collision between the first tooth portion M11 of the first gear roller M1 and the second tooth portion M21 of the second gear roller M2 in the circumferential direction, so as to ensure that the first tooth portion M11 is inserted into the second valley portion M22 without contact, and the second tooth portion M21 is inserted into the first valley portion M12 without contact.

[0231] In some embodiments, according to the above rules, the number of rotations of the first fixing member 5e and the second fixing member 5f is determined according to the phase angle of the first gear roller M1 that needs to be adjusted. In the above data, the first fixing member 5e and the second fixing member 5f rotate 1 circle respectively to obtain the pitch value L', and realize the rotation angle b of the first gear roller M1 relative to the second gear roller M2. These need to be pre-set when designing the MD stretching gear roller device M., so that the convenience in the actual adjustment operation process can be improved.

[0232] When the positioning member 5d drives the first rim plate 5a to rotate a certain angle relative to the first adjusting member 5b and completes the phase angle adjustment of the first gear roller M1, the first mounting hole 5a1 is relatively displaced relative to the first mounting groove 5b1, and the first rim plate 5a is connected to the first adjusting member 5b by inserting bolts into the first mounting groove 5b1 and the first mounting hole 5a1.

[0233] The present invention uses a precision adjustment component 5 to precisely adjust the deviation of the phase angle of the first gear roller M1 in the circumferential direction relative to the phase angle of the second gear roller M2 in the circumferential direction, so that the first tooth portion M11 of the first gear roller M1 can be located in the middle position (optimal position) of the second valley portion M22 in the circumferential direction of the second gear roller M2, thereby ensuring that the first tooth portion M11 is inserted into the second valley portion M22 and the second tooth portion M21 is inserted into the first valley portion M12 without contact after the depth increases.

[0234] like Fig.16 and Fig.21 As shown, the connecting assembly 10 is connected to the second gear roller M2, and the second coupling member 9 is connected to the connecting assembly 10. The difference between the connecting assembly 10 and the precision adjustment assembly 5 is that the connecting assembly 10 is not provided with a positioning member and a clamp.

[0235] Specifically, the connecting assembly 10 includes a second flange 10a and a second adjusting member 10b connected to the second flange 10a, the second flange 10a is connected to the second gear roller M2, and the second connecting member 9 is connected to the second adjusting member 10b of the connecting assembly 10.

[0236] The end surface of the second flange 10a has a plurality of second mounting holes 10a1 distributed along the circumferential direction. The end surface of the second adjusting member 10b has a plurality of second mounting grooves 10b1 distributed along the circumferential direction. The positions of the second mounting holes 10a1 and the second mounting grooves 10b1 along the circumferential direction correspond to each other. The second flange 10a is connected to the second adjusting member 10b by inserting bolts into the second mounting grooves 10b1 and the second mounting holes 10a1.

[0237] In some embodiments, the connection component 10 can also be provided with positioning members and clamps in the same manner as the precision adjustment component 5. When the connection component 10 is provided with the structure of positioning members and clamps, the precision adjustment component 5 on the first gear roller M1 does not need to be provided with positioning members 5d and clamps 5c. That is to say, only one of the first gear roller M1 and the second gear roller M2 needs to be connected to the structure of the precision adjustment component 5.

[0238] like Fig.16 As shown, according to an embodiment of the present invention, the MD stretching gear roller device M further includes a gap adjustment mechanism.

[0239] The gap adjustment mechanism connects the first sleeve 3 a and the second sleeve 3 b and is used to adjust the gap between the first gear roller M1 and the second gear roller M2 , thereby adjusting the depth R of the first tooth portion M11 inserted into the second valley portion M22 .

[0240] Specifically, in this embodiment, the gap adjustment mechanism includes a gap initial adjustment mechanism 12 and a gap fine adjustment mechanism 13 .

[0241] The initial gap adjustment mechanism 12 is connected to the first sleeve 3a or the second sleeve 3b, and is used to perform initial adjustment on the gap between the first gear roller M1 and the second gear roller M2, thereby performing initial adjustment on the depth M of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12.

[0242] Specifically, in this embodiment, the gap initial adjustment mechanism 12 is connected to the second sleeve 3b, and the second sleeve 3b is pushed by the gap initial adjustment mechanism 12 to drive the second gear roller M2 to approach or move away from the first gear roller M1, so as to preliminarily adjust the gap between the first gear roller M1 and the second gear roller M2, thereby preliminarily adjusting the depth R of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12.

[0243] The gap fine adjustment mechanism 13 is connected to the first sleeve 3a or the second sleeve 3b, and is used to precisely adjust the gap between the first gear roller M1 and the second gear roller M2, thereby precisely adjusting the depth R of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12.

[0244] Specifically, in this embodiment, the gap fine-adjusting mechanism 13 is connected to the first sleeve 3a, and the gap fine-adjusting mechanism 13 pushes the first sleeve 3a to drive the first gear roller M1 to approach or move away from the second gear roller M2, so as to precisely adjust the gap between the first gear roller M1 and the second gear roller M2, thereby precisely adjusting the depth R of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12.

[0245] In addition, if the elastic composite material 2 is changed or the equipment is modified, when the gap between the first gear roller M1 and the second gear roller M2 needs to be changed, that is, when the depth R of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12 change, the phase angle of the first gear roller M1 can also be adjusted by the precision adjustment component 5 to make appropriate adjustments to the depth R of the first tooth portion M11 inserted into the second valley portion M22 and the depth R of the second tooth portion M21 inserted into the first valley portion M12.

[0246] The present invention further provides a gear roller heater (not shown) inside the first gear roller M1 and the second gear roller M2, which is used to heat the elastic composite semi-finished product 2P during the extension (stretching) process, so that the extension effect of the elastic composite semi-finished product 2P is better. When the temperature setting of the gear roller heater changes, resulting in a slight deviation between the phase angle of the first gear roller M1 in the circumferential direction and the phase angle of the second gear roller M2 in the circumferential direction, the phase angle of the first gear roller M1 is adjusted by the precision adjustment component 5 to adjust the deviation of the phase angle of the first gear roller M1 in the circumferential direction relative to the phase angle of the second gear roller M2 in the circumferential direction.

[0247] Embodiment 2.

[0248] The difference between this embodiment and the first embodiment is that a method for preparing an elastic composite material further includes: a second stretching process S52: located on the downstream side of the first stretching process S51, the second stretching process S52 extends (stretches) the elastic composite semi-finished product 2P along the CD direction, and penetrates the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 at the joint 20c to form a through hole 20b.

[0249] Combination Figure 24 to Figure 26 Along the MD direction, the second stretching process S52 is arranged on the downstream side of the first stretching process S51 and is located on the upstream side of the elastic composite material conveying process S6.

[0250] The second stretching step S52 is performed by configuring a CD stretching gear roll device M'. The CD stretching gear roll device M' includes at least a third gear roll M3 and a fourth gear roll M4.

[0251] like Fig.25 and Fig.26 The outer peripheral surface of the third gear roller M3 is alternately provided with a plurality of third teeth M31 and third valleys M32 along the axial direction (CD direction), and the outer peripheral surface of the fourth gear roller M4 is alternately provided with a plurality of fourth teeth M41 and fourth valleys M42 along the axial direction (CD direction).

[0252] The third tooth portion M31 is inserted into the fourth valley portion M42 without contact, and the fourth tooth portion M41 is inserted into the third valley portion M32 without contact. The third tooth portion M31 and the fourth tooth portion M41 are inserted into the fourth valley portion M42 and the third valley portion M32 alternately without contact with each other to form a working area.

[0253] The third gear roller M3 and the fourth gear roller M4 rotate synchronously in opposite directions along the circumferential direction. When the elastic composite semi-finished product 2P passes through the working area, the elastic composite semi-finished product 2P is extended along the CD direction, and the first stretch non-woven fabric 21, the elastic film 23 and the second stretch non-woven fabric 22 are penetrated at the joint 20c to form a through hole 20b, forming an elastic composite material 2 in an elastically activated state.

[0254] When the third tooth portion M31 and the fourth tooth portion M41 are alternately inserted into the fourth valley portion M42 and the third valley portion M32 without contact with each other, the elastic composite semi-finished product 2P is pressed by the tooth tips of the third tooth portion M31 and the tooth tips of the fourth tooth portion M41.

[0255] like Fig.26 As shown, the tooth tip of the third tooth portion M31 is located on the center line LO of the tooth tips of two adjacent fourth tooth portions M41, and the line connecting the tooth tip of the third tooth portion M31 and the tooth tips of two adjacent fourth tooth portions M41 or the line connecting the tooth tip of the fourth tooth portion M41 and the tooth tips of two adjacent third tooth portions M31 forms a second insertion angle δ, and the second insertion angle δ is less than 90°.

[0256] By inserting the third tooth portion M31 into the fourth valley portion M42 without contact and inserting the fourth tooth portion M41 into the third valley portion M32 without contact, the elastic composite semi-finished product 2P is extended along the CD direction, and the joint 20c and the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 between two adjacent joints 20c are stretched along the CD direction.

[0257] In this embodiment, a CD stretching gear roller device M' is provided to stretch (stretch) the elastic composite semi-finished product 2P along the CD direction, so that the elastic composite material 2 expands along the CD direction, and the prepared elastic composite material 2 is prevented from shrinking along the CD direction, so that the product size becomes smaller. Through the stretching in the CD direction, a small-sized material can be stretched to a desired size, which can also save material costs to a certain extent.

[0258] Furthermore, in the present embodiment, at least one of the third gear roller M3 and the fourth gear roller M4 is provided with a gear roller heater for heating the third gear roller M3 and / or the fourth gear roller M4, thereby heating the elastic composite material semi-finished product 2P of the CD stretching gear roller device M' conveyed to the second stretching process S52, so that during the stretching process of the elastic composite material semi-finished product 2P along the CD direction, the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22 between two adjacent joints 20c along the CD direction are more easily stretched, and the stretchability of the prepared elastic composite material 2 can also be improved.

[0259] The other steps of this embodiment are the same as those of the first embodiment and will not be described again here.

[0260] Embodiment three.

[0261] The difference between this embodiment and the first and second embodiments is that only the second stretching step S52 is provided to stretch (stretch) the elastic composite semi-finished product 2P along the CD direction.

[0262] like Fig. 27 As shown, in this embodiment, a method for preparing an elastic composite material includes:

[0263] First supply step S1: The first stretch nonwoven fabric 21 is fed to the composite step S4 at a first speed V1 along the MD direction.

[0264] Second supply step S2: The second stretch nonwoven fabric 22 is fed to the composite step S4 at a second speed V2 along the MD direction.

[0265] Elastic film supplying step S3: The elastic film 23 is conveyed to the compounding step S4 at a third speed V3 along the MD direction.

[0266] Compounding process S4: Compounding process S4 is equipped with an ultrasonic heat sealing unit H, which includes an ultrasonic welding head H1 and an ultrasonic bottom roller H2 which are arranged opposite to each other; wherein the ultrasonic bottom roller H2 rotates in a circumferential direction at a first linear velocity V4, and is used to compound the elastic film 23 between the first stretch non-woven fabric 21 and the second stretch non-woven fabric 22, so as to form an elastic composite semi-finished product 2P in an elastic unactivated or pre-activated state.

[0267] The second stretching step S52 is located downstream of the compounding step S4 and upstream of the elastic composite material conveying step S6. The second stretching step S52 stretches the elastic composite material semi-finished product 2P in the CD direction and penetrates the first stretch nonwoven fabric 21, the elastic film 23 and the second stretch nonwoven fabric 22 at the joint 20c to form a through hole 20b.

[0268] In the second stretching step S52, a CD stretching gear roll device M' is disposed.

[0269] The structure of the CD stretching gear roller device M' in this embodiment is the same as that in the second embodiment, and the other processes are the same as those in the first embodiment, which will not be repeated here.

[0270] The elastic composite semi-finished product 2P formed by the compounding step S4 of the present invention has a reduced bending rigidity of the prepared elastic composite material 2 after being extended (stretched) by the first extending step S51 and / or the second extending step S52, and the surface of the elastic composite material 2 is more fluffy and has better softness.

[0271] Experimental example 1.

[0272] By extending three groups of elastic composite semi-finished products 2P numbered NO.1, NO.2 and NO.3 through the first extending step S51, the first extending step S51 and the second extending step S52 (stretching), three groups of elastic composite materials 2 are obtained respectively.

[0273] The radial (CD direction) and weft (MD direction) bending stiffness tests were performed on three groups of elastic composite semi-finished products 2P and three groups of elastic composite materials 2 obtained by different stretching processes (first stretching process S51 stretching, first stretching process S51 and second stretching process S52 stretching), and the bending stiffness comparison table of the elastic composite semi-finished product 2P and the elastic composite material 2 was obtained in Table 1.

[0274] Table 1 Comparison of flexural stiffness of elastic composite semi-finished product 2P and elastic composite material 2

[0275]

[0276]

[0277] As can be seen from Table 1, before the elastic composite semi-finished product 2P is stretched, the average bending stiffness in the warp direction (CD direction) is 29.310 mg*cm, and the average bending stiffness in the weft direction (MD direction) is 64.150 mg*cm.

[0278] After the elastic composite semi-finished product 2P is stretched in the first stretching step S51, the average bending stiffness of the obtained elastic composite material 2 in the warp direction (CD direction) is 12.190 mg*cm, and the average bending stiffness in the weft direction (MD direction) is 12.060 mg*cm.

[0279] After the elastic composite semi-finished product 2P is stretched through the first stretching step S51 and the second stretching step S52, the average bending stiffness of the obtained elastic composite material 2 in the warp direction (CD direction) is 4.790 mg*cm, and the average bending stiffness in the weft direction (MD direction) is 11.520 mg*cm.

[0280] It can be seen from Table 1 that the elastic composite material semi-finished product 2P formed by the compounding step S4 of the present invention, after being extended (stretched) by the first extending step S51, the first extending step S51 and the second extending step S52, the bending stiffness of the prepared elastic composite material 2 is significantly reduced, and the surface of the elastic composite material 2 is more fluffy and has better softness.

[0281] Experimental Example 2.

[0282] By extending (stretching) ten sets of elastic composite material semi-finished products 2P numbered NO.1, NO.2, ..., NO.10 through the first extending step S51, the first extending step S51 and the second extending step S52, ten sets of elastic composite material 2 are obtained respectively.

[0283] Thickness tests were performed on ten groups of elastic composite semi-finished products 2P and ten groups of elastic composite materials 2 obtained through different stretching processes (first stretching process S51 stretching, first stretching process S51 and second stretching process S52 stretching), and a thickness comparison table of the elastic composite semi-finished products 2P and the elastic composite materials 2 was obtained in Table 2.

[0284] Table 2 Thickness comparison of elastic composite semi-finished product 2P and elastic composite material 2

[0285]

[0286]

[0287] As can be seen from Table 2, the average bulk thickness of the elastic composite semi-finished product 2P before stretching is 0.395 mm.

[0288] After the elastic composite semi-finished product 2P is stretched in the first stretching step S51 , the average thickness of the obtained elastic composite material 2 is 0.793 mm.

[0289] After the elastic composite semi-finished product 2P is extended through the first extending step S51 and the second extending step S52 , the average thickness of the obtained elastic composite material 2 is 0.878 mm.

[0290] It can be seen from Table 2 that the elastic composite material semi-finished product 2P formed by the compounding step S4 of the present invention, after being extended (stretched) by the first extending step S51, the first extending step S51 and the second extending step S52, the thickness of the prepared elastic composite material 2 is increased, the surface of the elastic composite material 2 is more fluffy, and has better softness.

[0291] As can be seen from Table 2, the thickness range of the elastic composite material 2 prepared by the present invention is 0.5mm-1mm. Compared with the thickness range of 2mm-4mm of the elastic composite material 2 of the wearing article in the prior art, the elastic composite material 2 prepared by the present invention is thinner and smoother, and the wearing article prepared therefrom feels lighter, thinner, and more comfortable to wear, and does not feel bloated.

[0292] There are a few points to note:

[0293] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the general design.

[0294] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of the layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0295] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0296] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for preparing an elastic composite material, characterized in that: The preparation method comprises: First supply step S1: conveying the first elongated nonwoven fabric to the composite step S4 at a first speed V1 along the MD direction; Second supply step S2: conveying the second elongated nonwoven fabric to the composite step S4 at a second speed V2 along the MD direction; Elastic film supplying step S3: conveying the elastic film to the compounding step S4 at a third speed V3 along the MD direction; Compounding step S4: the compounding step S4 is equipped with an ultrasonic heat sealing unit, and the ultrasonic heat sealing unit includes an ultrasonic welding head and an ultrasonic bottom roller which are arranged opposite to each other; The ultrasonic bottom roller rotates in the circumferential direction at a first linear velocity V4 to laminate the elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite semi-finished product in an elastically unactivated or pre-activated state; The elastic composite semi-finished product is formed into a plurality of joints arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction; wherein the MD direction is the process direction of processing the elastic composite material, and the CD direction is perpendicular to the MD direction; The first stretching step S51 is located at the downstream side of the composite step S4. The first stretching step S51 stretches the semi-finished elastic composite material along the MD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole. Wherein, the first stretching process S51 is equipped with an MD stretching gear roller device; the MD stretching gear roller device at least includes a first gear roller and a second gear roller; Wherein, a plurality of first teeth and first valleys are alternately arranged on the outer circumferential surface of the first gear roller along the circumferential direction, and a plurality of second teeth and second valleys are alternately arranged on the outer circumferential surface of the second gear roller along the circumferential direction; The first tooth portion and the second tooth portion are alternately inserted into the second valley portion and the first valley portion without contact with each other to form a working area; The first gear roller and the second gear roller rotate synchronously in opposite directions along the circumferential direction at a second linear speed V5, and when the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the MD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state; Among them, when the first tooth portion and the second tooth portion are inserted into the second valley portion and the first valley portion alternately without contact with each other, the elastic composite material semi-finished product is contacted and pressed by the tooth tips of the first tooth portion and the tooth tips of the second tooth portion, and on the line connecting the axis of the first gear roller and the axis of the second gear roller, the line connecting the tooth tip of the first tooth portion and the tooth tips of two adjacent second teeth portions or the line connecting the tooth tip of the second tooth portion and the tooth tips of two adjacent first teeth portions forms a first insertion angle β, and the first insertion angle β is less than 90°.

2. The preparation method according to claim 1, characterized in that: The first linear velocity V4 is less than or equal to 1.25 times the third velocity V3.

3. The preparation method according to claim 1, characterized in that: The first linear velocity V4 is less than or equal to the third velocity V3.

4. The preparation method according to claim 1, characterized in that: The first speed V1, the second speed V2 and the first linear speed V4 are equal.

5. The preparation method according to claim 1, characterized in that: The first insertion angle β ranges from 30° to 85°.

6. The preparation method according to claim 1, characterized in that: On the surface of the ultrasonic bottom roller, a plurality of convex portions are arranged at intervals along the circumferential direction of the ultrasonic bottom roller, and the first elongated nonwoven fabric, the second elongated nonwoven fabric and the elastic film are mutually fused on the convex portions to form a plurality of the joining portions.

7. The preparation method according to claim 1, characterized in that: The plurality of first tooth portions and the plurality of second tooth portions respectively extend along the axial direction of the MD stretching gear roller device, and when the elastic composite semi-finished product passes through the working area of ​​the first stretching process S51, the first tooth portions and the second tooth portions respectively correspond at least partially to the joining portions of the elastic composite semi-finished product.

8. The preparation method according to claim 7, characterized in that: In the first extension process S51, the first tooth portion is inserted into the second valley portion without contact, and the second tooth portion is inserted into the first valley portion without contact, so that a through hole is formed in the joint area through the semi-finished elastic composite material; in the area outside the joint, the semi-finished elastic composite material is extended as a whole along the MD direction.

9. The preparation method according to claim 1, characterized in that: The first linear velocity V4 is greater than or equal to the second linear velocity V5.

10. The preparation method according to claim 9, characterized in that: The first linear velocity V4 is equal to 1.2 to 1.6 times of the second linear velocity V5.

11. The preparation method according to claim 1, characterized in that: The preparation method further comprises: The second stretching step S52 is located at the downstream side of the first stretching step S51. The second stretching step S52 stretches the semi-finished elastic composite material in the CD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole. Wherein, the second stretching step S52 is equipped with a CD stretching gear roller device; the CD stretching gear roller device at least includes a third gear roller and a fourth gear roller; Wherein, the outer circumference of the third gear roller is provided with a plurality of third teeth and third valleys alternately along the axial direction, and the outer circumference of the fourth gear roller is provided with a plurality of fourth teeth and fourth valleys alternately along the axial direction; The third tooth portion and the fourth tooth portion are alternately inserted into the fourth valley portion and the third valley portion without contact with each other to form a working area; The third gear roller and the fourth gear roller rotate synchronously in opposite directions along the circumferential direction. When the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the CD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state; Wherein, when the third tooth portion and the fourth tooth portion are inserted into the fourth valley portion and the third valley portion alternately without contact with each other, the elastic composite semi-finished product is pressed by the tooth tip of the third tooth portion and the tooth tip of the fourth tooth portion; In which, the tooth tip of the third tooth portion is located on the center line of the tooth tips of the two adjacent fourth tooth portions, and the line connecting the tooth tip of the third tooth portion and the tooth tips of the two adjacent fourth tooth portions or the line connecting the tooth tip of the fourth tooth portion and the tooth tips of the two adjacent third tooth portions forms a second insertion angle δ, and the second insertion angle δ is less than 90°.

12. The preparation method according to claim 1, characterized in that: The preparation method further comprises: Elastic composite material conveying step S6: along the MD direction, the elastic composite material conveying step S6 is arranged at the downstream side of the first stretching step S51, and is used to clamp the elastic composite material and convey it to the downstream side.

13. The preparation method according to claim 12, characterized in that: The elastic composite material conveying step S6 is provided with a conveying roller device; the conveying roller device at least includes a conveying roller and a clamping roller; The conveying roller and the clamping roller are arranged opposite to each other, and the conveying roller rotates along the circumferential direction at a third linear speed V6. The clamping roller and the conveying roller clamp the elastic composite material and convey it to the downstream side.

14. The preparation method according to claim 13, characterized in that: The third linear velocity V6 is greater than or equal to 1.2 times of the second linear velocity V5 at which the first gear roller and the second gear roller rotate synchronously in opposite directions along the circumferential direction.

15. The preparation method according to claim 1, characterized in that: The breaking elongation of the first elongated nonwoven fabric and the second elongated nonwoven fabric is 80% to 200%; the gram weight of the first elongated nonwoven fabric and the second elongated nonwoven fabric is in the range of 6 to 30 g / m 2 .

16. The preparation method according to claim 12, characterized in that: The preparation method further includes: an expansion and deviation correction step S7: along the MD direction, the expansion and deviation correction step S7 is arranged on the downstream side of the elastic composite material conveying step S6, for expanding and correcting the elastic composite material, and conveying it to the downstream side.

17. A method for preparing an elastic composite material, characterized in that: The preparation method comprises: First supply step S1: conveying the first elongated nonwoven fabric to the composite step S4 at a first speed V1 along the MD direction; Second supply step S2: conveying the second elongated nonwoven fabric to the composite step S4 at a second speed V2 along the MD direction; Elastic film supplying step S3: conveying the elastic film to the compounding step S4 at a third speed V3 along the MD direction; Compounding step S4: the compounding step S4 is equipped with an ultrasonic heat sealing unit, and the ultrasonic heat sealing unit includes an ultrasonic welding head and an ultrasonic bottom roller which are arranged opposite to each other; Wherein, the ultrasonic bottom roller rotates in the circumferential direction at a first linear velocity V4 to compound the elastic film between the first elongated non-woven fabric and the second elongated non-woven fabric to form an elastic composite semi-finished product in an elastically unactivated or pre-activated state; and forming a plurality of joints arranged in a plurality of rows along the MD direction and in a plurality of columns along the CD direction on the semi-finished elastic composite material; The second stretching step S52 is located at the downstream side of the composite step S4. The second stretching step S52 stretches the semi-finished elastic composite material in the CD direction and penetrates the first stretch non-woven fabric, the elastic film and the second stretch non-woven fabric at the joint to form a through hole. Wherein, the second stretching step S52 is equipped with a CD stretching gear roller device; the CD stretching gear roller device at least includes a third gear roller and a fourth gear roller; Wherein, the outer circumference of the third gear roller is provided with a plurality of third teeth and third valleys alternately along the axial direction, and the outer circumference of the fourth gear roller is provided with a plurality of fourth teeth and fourth valleys alternately along the axial direction; The third tooth portion and the fourth tooth portion are alternately inserted into the fourth valley portion and the third valley portion without contact with each other to form a working area; The third gear roller and the fourth gear roller rotate synchronously in opposite directions along the circumferential direction. When the semi-finished elastic composite material passes through the working area, the semi-finished elastic composite material is extended along the CD direction, and the first elongated non-woven fabric, the elastic film and the second elongated non-woven fabric are penetrated at the joint to form a through hole, thereby forming an elastic composite material in an elastically activated state; Wherein, when the third tooth portion and the fourth tooth portion are inserted into the fourth valley portion and the third valley portion alternately without contact with each other, the elastic composite semi-finished product is pressed by the tooth tip of the third tooth portion and the tooth tip of the fourth tooth portion; In which, the tooth tip of the third tooth portion is located on the center line of the tooth tips of the two adjacent fourth tooth portions, and the line connecting the tooth tip of the third tooth portion and the tooth tips of the two adjacent fourth tooth portions or the line connecting the tooth tip of the fourth tooth portion and the tooth tips of the two adjacent third tooth portions forms a second insertion angle δ, and the second insertion angle δ is less than 90°.

18. An MD stretching gear roll device used in the preparation method according to any one of claims 1 to 16, characterized in that: The MD stretching gear roller device at least comprises: a first gear roller, a second gear roller and a precision adjustment assembly arranged in parallel along the axial direction, the first gear roller is connected to the precision adjustment assembly; the first gear roller and the second gear roller are configured to rotate synchronously in opposite directions along the circumferential direction; Wherein, a plurality of first teeth and first valleys are alternately arranged on the outer circumference of the first gear roller, and a plurality of second teeth and second valleys are alternately arranged on the outer circumference of the second gear roller; The first tooth portion of the first gear roller is inserted into the second valley portion of the second gear roller without contact, so as to form a working area for processing the semi-finished elastic composite material; Wherein, the precision adjustment assembly comprises a first flange plate arranged along the axial direction, and a first adjustment member connected to the first flange plate, and the first flange plate is connected to the first gear roller; The precision adjustment assembly further includes a positioning member, a clamp, a first fixing member, and a second fixing member; the positioning member is connected to the first edge plate along the circumferential direction, the clamp is fixed to the first adjustment member along the circumferential direction, and the positions of the positioning member and the clamp in the circumferential direction correspond to each other; The first fixing member and the second fixing member extend into the clamp so that the first fixing member and the second fixing member clamp the positioning member, wherein the first fixing member and the second fixing member are respectively arranged perpendicular to the positioning member; By synchronously adjusting the first fixing member and the second fixing member to move in the same direction in the clamp, the positioning member is rotated by a certain angle along with the movement of the first fixing member and the second fixing member; The positioning member drives the first edge plate to rotate a certain angle relative to the first adjusting member, so that the first edge plate drives the first gear roller to rotate a certain angle to adjust the phase angle of the first gear roller.

19. The MD stretching gear roller device according to claim 18, characterized in that: The clamp comprises a mounting portion, an opening portion and ears located at both sides of the opening portion, and the positioning member is arranged in the opening portion and connected to the first edge plate; The first fixing member and the second fixing member are respectively installed in the ears located at both sides of the opening; and the first fixing member and the second fixing member extend into the opening so that the first fixing member and the second fixing member clamp the positioning member.

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