Production process of composite elastic cotton and production equipment of composite elastic cotton

Abstract

The present invention relates to a production process of composite elastic cotton and a production equipment of composite elastic cotton, and belongs to the field of non-woven composite technology. The production equipment of the composite elastic cotton comprises an unwinding system, an automatic opening machine and a composite system which are arranged in sequence, the composite system is provided with a composite position, the upper opening system comprises an upper arc support column, and a plurality of upper opening devices are arranged at both ends of the upper side of the upper arc support column, the lower opening system comprises a lower arc support column, and a plurality of lower opening devices are arranged at both ends of the lower side of the lower arc support column, each upper arc support column is provided with a plurality of upper opening holes, the upper opening holes are connected with the corresponding upper opening devices, the upper opening holes and the corresponding upper opening devices are respectively located at the two ends of the upper arc support column, and each upper opening device deflects toward the edge of the upper opening system when the corresponding upper opening hole is closed, which has high reliability, low production cost, and greatly reduces waste.

Description

Technical Field

[0001] The invention relates to the technical field of non-woven fabric composites, and in particular to a production process and equipment for composite elastic cotton. Background Art

[0002] Non-woven fabric, also known as non-woven fabric, is made of polyester fiber, polyester fiber and other materials. It is made through needle punching or spunbonding process and can be made into different thickness, feel and hardness.

[0003] Non-woven fabrics are moisture-proof, breathable, flexible, thin, flame-retardant, non-toxic and tasteless, inexpensive, and recyclable. They can be used in different industries, such as thermal insulation, sound insulation, heat insulation, clothing, and other fields.

[0004] When non-woven fabrics produced by traditional processes are made into thermal insulation cotton, multiple layers of non-woven fabrics need to be compounded to increase thickness and thermal insulation. Since the compounding process requires unwinding, compounding and winding, the non-woven fabric will be deflected in each process during transportation. In order to leave enough margin for the deflection of the non-woven fabric, the existing compounding method often increases the width of the non-woven fabric raw material, and then cuts off the area that is not compounded due to the deflection. This not only causes a large amount of raw material waste, but also reduces the size of the product. Therefore, it is necessary to propose a production process and equipment for composite elastic cotton. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a production process and equipment for composite stretch cotton. The present invention uses a purely mechanical mechanism to achieve automatic rapid deviation correction, has high reliability, low production cost, and greatly reduces raw material waste.

[0006] The technical solution adopted by the present invention is:

[0007] The production equipment of composite elastic cotton comprises an unwinding system, an automatic opening machine and a composite system which are arranged in sequence, wherein the unwinding system comprises an upper unwinding device and a lower unwinding device, the automatic opening machine comprises an upper opening system and a lower opening system, the distance between the upper opening system and the lower opening system is greater than the distance between the upper unwinding device and the lower unwinding device, the composite system is provided with a composite position, the upper opening system comprises an upper arc support column, and both ends of the upper side of the upper arc support column are provided with a plurality of upper opening devices, the lower opening system comprises a lower arc support column, and both ends of the lower side of the lower arc support column are provided with A plurality of lower support devices, each of the upper arc support columns is provided with a plurality of upper support holes, the upper support holes are connected with the corresponding upper support devices, the upper support holes and the corresponding upper support devices are respectively located at the two ends of the upper arc support columns, and each of the upper support devices is deflected toward the edge of the upper support system when the corresponding upper support hole is closed, and a plurality of lower support holes are provided on each of the lower arc support columns, the lower support holes are connected with the corresponding lower support devices, the lower support holes and the corresponding lower support devices are respectively located at the two ends of the lower arc support columns, and each of the lower support devices is deflected toward the edge of the lower support system when the corresponding lower support hole is closed.

[0008] Preferably, the composite system comprises a composite frame, a plurality of upper composite devices and a plurality of lower composite devices, each of the upper composite devices being mounted on the composite frame in a liftable manner, and the lower composite devices being mounted rotatably on the lower side of the corresponding upper composite device.

[0009] Preferably, the upper composite device includes a composite roller, two composite sliders and two lifting screws, the lifting screws are rotatably installed on the composite frame, each composite slider is installed on the composite frame in a lifting and sliding manner, each lifting screw is connected to the corresponding composite slider through a threaded pair transmission, and the composite roller is rotatably installed between the two composite sliders.

[0010] Preferably, the upper expansion device includes an upper expansion control box and an upper expansion plate, the upper expansion plate is rotatably mounted on the upper expansion control box, an upper pneumatic plate is provided on the lower side of the upper expansion plate, the upper control box is provided with an upper pressure chamber, an upper negative pressure air pipe and an upper sensing hole air pipe, the upper pneumatic plate slides along the upper pressure chamber, the upper negative pressure air pipe and the upper sensing hole air pipe are both located on the corresponding upper pneumatic plate of the upper expansion control box, close to the middle part of the upper circular arc support column, and the upper sensing hole air pipe is connected to the upper expansion hole corresponding to the other end of the upper circular arc support column.

[0011] Preferably, an upper limit block is provided in the upper pressure chamber.

[0012] Preferably, an upper opening guide edge is provided on the upper opening plate.

[0013] Preferably, the lower expansion device includes a lower expansion control box and a lower expansion plate, the lower expansion plate is rotatably mounted on the lower expansion control box, a lower pneumatic plate is provided on the lower side of the lower expansion plate, the lower expansion control box is provided with a lower pressure chamber, a lower negative pressure air pipe and a lower sensing hole air pipe, the lower pneumatic plate slides along the lower pressure chamber, the lower negative pressure air pipe and the lower sensing hole air pipe are both located on the corresponding lower pneumatic plate of the lower expansion control box, close to the middle part of the lower circular arc support column, and the lower sensing hole air pipe is connected to the corresponding lower expansion hole at the other end of the lower circular arc support column.

[0014] Preferably, a lower limit block is provided in the lower pressure chamber.

[0015] Preferably, a lower support guide edge is provided on the lower support plate.

[0016] The production process of composite stretch cotton, using the production equipment of composite stretch cotton, includes the following steps:

[0017] S1: Two kinds of cotton webs are unwound from the upper unwinding device and the lower unwinding device respectively, and the two kinds of cotton webs are bypassed from the upper opening system and the lower opening system respectively, and then the two kinds of cotton webs are stacked and enter the composite position;

[0018] S2: The upper support hole is connected to the negative pressure fan, and the upper support device is deflected to the edge of the upward support system when the corresponding upper support hole is blocked and closed by the cotton net. The lower support hole is connected to the negative pressure fan, and the lower support device is deflected to the edge of the downward support system when the corresponding lower support hole is blocked and closed by the cotton net.

[0019] S3: The composite system is heated to achieve thermal composite.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The unwinding system of the present invention includes an upper unwinding device and a lower unwinding device, which are used to unwind two kinds of cotton nets. Please note that the cotton net expression commonly used by technical personnel in this field is used here, but the cotton net is not made of cotton, but made of hot-melt polyester fiber. The automatic opening machine includes an upper opening system and a lower opening system. The distance between the upper opening system and the lower opening system is greater than the distance between the upper unwinding device and the lower unwinding device, so that the cotton net is under the action of the tensioning force of the cotton net. The upper opening system and the lower opening system are respectively pressed, which is convenient for adaptively opening the cotton net and correcting the position of the cotton net. The composite system is provided with a composite position to realize thermal composite. The upper opening system includes an upper arc support column. The upper arc support column adopts an arc shape to prevent the cotton net from getting stuck, so that the cotton net flows smoothly. A number of upper opening devices are provided at both ends of the upper side of the upper arc support column. The lower opening system includes a lower arc support column. The lower arc support column adopts an arc shape to prevent the cotton net from getting stuck, so that the cotton net flows smoothly. A number of lower opening devices are provided at both ends of the lower side of the lower arc support column.

[0022] Each upper arc support column is provided with a plurality of upper support holes, which are connected to the corresponding upper support devices, and the upper support holes and the corresponding upper support devices are respectively located at the two ends of the upper arc support column. Please pay special attention to the above description. When the upper support hole is blocked by the cotton net, the deflection direction of the cotton net is toward the upper support hole. Since the upper support hole and the corresponding upper support device are respectively located at the two ends of the upper arc support column, that is to say, the corresponding upper support device at the other end of the upper arc support column pulls the fabric away from the upper support hole. The holes move in the direction of the holes so that automatic deviation correction can be achieved. Therefore, when the upper support holes are covered and sealed by the cotton net, each upper support device deflects toward the edge of the upper support system when the corresponding upper support holes are closed to achieve deviation correction traction on the cotton net. The principle is the same as that of the upper arc support column. Each lower arc support column is provided with a plurality of lower support holes, which are connected with the corresponding lower support devices. The lower support holes and the corresponding lower support devices are respectively located at the two ends of the lower arc support column. Please pay special attention to the above statement. When the hole is blocked by the cotton net, the deflection direction of the cotton net is toward the lower support hole, and since the lower support hole and the corresponding lower support device are respectively located at the two ends of the lower arc support column, that is to say, the corresponding lower support device on the other end of the lower arc support column pulls the fabric to move away from the lower support hole, so that automatic deviation correction can be achieved. Therefore, when the lower support hole is covered and sealed by the cotton net, each lower support device needs to deflect toward the edge of the lower support system when the corresponding lower support hole is closed to achieve deviation correction and traction on the cotton net. The upper unwinding device and the lower unwinding device unwind the cotton net respectively, and the cotton net will inevitably deflect during the unwinding process. Due to the deflection of the cotton net, the upper supporting holes and the lower supporting holes will be dynamically covered. The more upper supporting holes or lower supporting holes are covered, the more upper supporting devices or lower supporting devices will deflect at the other end of the upper arc support column or the lower arc support column, thereby pulling the cotton net to correct the lateral position. The use of a purely mechanical mechanism realizes automatic and rapid deviation correction, has high reliability, low production cost, and greatly reduces raw material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0025] Figure 3 Schematic diagram of the upper support system structure.

[0026] Figure 4 for Figure 3 Enlarged schematic diagram of point B in the middle.

[0027] Figure 5 It is a schematic diagram of the structure of the upper support device.

[0028] Figure 6Schematic diagram of the upper support control box structure.

[0029] Figure 7 It is a schematic diagram of the structure of the upper support device.

[0030] Figure 8 It is a schematic diagram of the structure after the upper support device is deflected.

[0031] Description of reference numerals:

[0032] 1. Unwinding system; 11. Upper unwinding device; 12. Lower unwinding device;

[0033] 2. Automatic opening machine; 21. Upper opening system; 211. Upper arc support column; 2111. Upper opening hole; 212. Upper opening device; 2121. Upper opening control box; 21211. Upper pressure chamber; 212111. Upper limit block; 21212. Upper negative pressure air pipe; 21213. Upper sensing hole air pipe; 2122. Upper opening plate; 21221. Upper pneumatic plate; 21222. Upper opening guide edge; 22. Lower opening system;

[0034] 3. Compound system; 31. Compound frame; 32. Upper compound device; 321. Compound roller; 322. Compound slider; 323. Lifting screw; 33. Lower compound device. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with the accompanying drawings:

[0036] like Figure 1 — Figure 8 As shown, this embodiment provides a production device for composite stretch cotton, including an unwinding system 1, an automatic opening machine 2 and a composite system 3 arranged in sequence, the unwinding system 1 includes an upper unwinding device 11 and a lower unwinding device 12, which are used to unwind two kinds of cotton nets. Please note that the cotton net expression commonly used by technicians in this field is used here, but the cotton net is not made of cotton, but made of hot-melt polyester fiber. The automatic opening machine 2 includes an upper opening system 21 and a lower opening system 22. The distance between the upper opening system 21 and the lower opening system 22 is greater than the distance between the upper unwinding device 11 and the lower unwinding device 12, so that the cotton net is under the action of the tensioning force of the cotton net. , pressure is applied to the upper support system 21 and the lower support system 22 respectively to facilitate adaptive support of the cotton net and correct the position of the cotton net. The composite system 3 is provided with a composite position to achieve thermal composite. The upper support system 21 includes an upper arc support column 211. The upper arc support column 211 adopts an arc shape to prevent the cotton net from getting stuck, so that the cotton net can flow smoothly. A number of upper support devices 212 are provided at both ends of the upper side of the upper arc support column 211. The lower support system 22 includes a lower arc support column. The lower arc support column adopts an arc shape to prevent the cotton net from getting stuck, so that the cotton net can flow smoothly. A number of lower support devices are provided at both ends of the lower side of the lower arc support column.

[0037] Each upper arc support column 211 is provided with a plurality of upper support holes 2111, and the upper support holes 2111 are connected to the corresponding upper support devices 212, and the upper support holes 2111 and the corresponding upper support devices 212 are respectively located at the two ends of the upper arc support column 211. Please pay special attention to the above description. When the upper support hole 2111 is blocked by the cotton net, the deflection direction of the cotton net is toward the upper support hole 2111. Since the upper support hole 2111 and the corresponding upper support device 212 are respectively located at the two ends of the upper arc support column 211, that is to say, the upper arc support column 211 is blocked by the cotton net. The corresponding upper supporting device 212 on one end pulls the fabric to move away from the upper supporting hole 2111, so that automatic deviation correction can be achieved. Therefore, when the upper supporting hole 2111 is covered and sealed by the cotton net, each upper supporting device 212 deflects toward the edge of the upper supporting system 21 when the corresponding upper supporting hole 2111 is closed to achieve deviation correction and traction on the cotton net. The principle is the same as that of the upper arc support column 211. Each lower arc support column is provided with a plurality of lower supporting holes, which are connected to the corresponding lower supporting devices, and the lower supporting holes and the corresponding lower supporting devices are respectively located in the lower arc At both ends of the support column, please pay special attention to the above statement. When the lower support hole is blocked by the cotton net, the deflection direction of the cotton net is toward the lower support hole, and because the lower support hole and the corresponding lower support device are respectively located at the two ends of the lower arc support column, that is to say, the corresponding lower support device on the other end of the lower arc support column pulls the fabric to move away from the lower support hole, so that automatic deviation correction can be achieved. Therefore, when the lower support hole is covered and sealed by the cotton net, each lower support device deflects towards the edge of the lower support system 22 when the corresponding lower support hole is closed to achieve deviation correction of the cotton net. The upper unwinding device 11 and the lower unwinding device 12 unwind the cotton net respectively, and the cotton net will inevitably deflect during the unwinding process. Due to the deflection of the cotton net, the upper support hole 2111 and the lower support hole will be dynamically covered. The more upper support holes 2111 or lower support holes are covered, the more upper support devices 212 or lower support devices will be deflected at the other end of the upper arc support column 211 or the lower arc support column, and then the cotton net is pulled to correct the lateral position. The use of pure mechanical mechanism realizes automatic and rapid deviation correction, has high reliability, low production cost, and greatly reduces the waste of raw materials.

[0038] Specifically, the composite system 3 includes a composite frame 31, a plurality of upper composite devices 32 and a plurality of lower composite devices 33. Each upper composite device 32 can be installed on the composite frame 31 in a liftable manner, and the lower composite device 33 can be rotatably installed on the lower side of the corresponding upper composite device 32. The upper composite device 32 and the corresponding lower composite device 33 are pressed together to achieve composite, and the upper composite device 32 and the corresponding lower composite device 33 form a composite position.

[0039] Specifically, the upper composite device 32 includes a composite roller 321, two composite sliders 322 and two lifting screws 323. The lifting screws 323 are rotatably installed on the composite frame 31. Each composite slider 322 is installed on the composite frame 31 so as to be lifted and slidable. Each lifting screw 323 is connected to the corresponding composite slider 322 through a threaded pair transmission. The composite roller 321 is rotatably installed between the two composite sliders 322. The lifting screws 323 are rotated to adjust the lifting screws to realize the lifting and lowering of the composite slider 322 and the lifting and lowering of the composite roller 321. Each composite roller 321 is heated by conventional steam heating or electric heating to facilitate thermal composite.

[0040] Specifically, the upper opening device 212 includes an upper opening control box 2121 and an upper opening plate 2122, the upper opening plate 2122 is rotatably mounted on the upper opening control box 2121, an upper pneumatic plate 21221 is provided on the lower side of the upper opening plate 2122, the upper opening control box 2121 is provided with an upper pressure chamber 21211, an upper negative pressure air pipe 21212 and an upper sensing hole air pipe 21213, the upper pneumatic plate 21221 slides along the upper pressure chamber 21211, the upper negative pressure air pipe 21212 and the upper sensing hole air pipe 21213 are both located on the corresponding upper pneumatic plate 21221 of the upper opening control box 2121 close to the middle part of the upper arc support column 211 (that is, both are located Figure 7 or Figure 8 On the right side of the middle upper pneumatic plate 21221), the upper sensing hole air pipe 21213 is connected to the upper support hole 2111 corresponding to the other end of the upper arc support column 211, and the upper negative pressure air pipe 21212 is connected to the negative pressure fan. When the upper support hole 2111 is not covered by the cotton net, the airflow conduction sequence is that the airflow is sucked into the upper pressure chamber 21211 from the upper support hole 2111 through the upper sensing hole air pipe 21213, until the negative pressure fan is sucked into the upper negative pressure air pipe 21212. After the cotton net blocks the upper support hole 2111, the negative pressure suddenly rises, and the negative pressure is transmitted to the upper pressure chamber 21211 through the upper sensing hole air pipe 21213, thereby driving the upper pneumatic plate 21221 to deflect.

[0041] Specifically, an upper limit block 212111 is provided in the upper pressure chamber 21211 to prevent the upper pneumatic plate 21221 from excessive deflection.

[0042] Specifically, an upper spreading guide ridge 21222 is provided on the upper spreading plate 2122, and the upper spreading guide ridge 21222 enables the cotton web to be reliably guided, thereby correcting the position of the cotton web in time.

[0043] Specifically, the principle of the lower opening device 212 is the same as that of the upper opening device 212, and the lower opening device includes a lower opening control box and a lower opening plate, the lower opening plate is rotatably mounted on the lower opening control box, a lower pneumatic plate is provided on the lower side of the lower opening plate, the lower opening control box is provided with a lower pressure chamber, a lower negative pressure air pipe and a lower sensing hole air pipe, the lower pneumatic plate slides along the lower pressure chamber, the lower negative pressure air pipe and the lower sensing hole air pipe are both located at the corresponding lower pneumatic plate of the lower opening control box near the middle of the lower arc support column On the other side, the lower sensing hole air pipe is connected to the lower support opening corresponding to the other end of the lower arc support column, and the lower negative pressure air pipe is connected to the negative pressure fan. When the lower support opening is not covered by the cotton net, the airflow conduction sequence is that the airflow is sucked into the lower pressure chamber from the lower support opening through the lower sensing hole air pipe, until the negative pressure fan is sucked into the negative pressure fan from the lower negative pressure air pipe. After the cotton net blocks the lower support opening, the negative pressure suddenly rises, and the negative pressure is transmitted to the lower pressure chamber through the lower sensing hole air pipe, thereby driving the lower pneumatic plate to deflect.

[0044] Specifically, a lower limit block is provided in the lower pressure chamber to prevent excessive deflection of the lower pneumatic plate.

[0045] Specifically, a lower supporting guide ridge is provided on the lower supporting plate, and the lower supporting guide ridge enables the cotton web to be reliably guided, thereby correcting the position of the cotton web in time.

[0046] The production process of composite stretch cotton, using the production equipment of composite stretch cotton, includes the following steps:

[0047] S1: Two cotton webs are unwound from the upper unwinding device 11 and the lower unwinding device 12 respectively, and the two cotton webs are bypassed from the upper opening system 21 and the lower opening system 22 respectively, and then the two cotton webs are stacked and enter the composite position;

[0048] S2: The upper support hole 2111 is connected to the negative pressure fan, and the upper support device 212 is deflected to the edge of the upward support system 21 when the corresponding upper support hole 2111 is blocked and closed by the cotton net. The lower support hole is connected to the negative pressure fan, and the lower support device is deflected to the edge of the downward support system 22 when the corresponding lower support hole is blocked and closed by the cotton net.

[0049] S3: The composite system 3 is heated to achieve thermal composite.

[0050] Although cotton mesh production is already a prior art, this embodiment still provides a method for making a cotton mesh:

[0051] Step 1, prepare materials: Use 1.3D-7D polyester fiber, fiber length 32㎜-76㎜, polyester fiber has good elasticity and ductility to adapt to changes in the human body. According to weight percentage, polyester fiber accounts for 30%, 3D×64㎜ recycled polyester fiber accounts for 60%, and 4D×64㎜ low melting point polyester fiber accounts for 10%.

[0052] Step 2: After cotton blending, loosening, carding with a carding machine (speed 1000 / min), web laying (speed 70m / min), and oven drying (speed 4m / min), the weight of each layer of cotton web is 8g / ㎡. The oven temperature is 125℃, and then the cotton web is inspected for metal and rolled.

[0053] Step three, compounding the cotton web with the composite elastic cotton production equipment of the present invention and then rolling it up again to obtain the composite elastic cotton.

[0054] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. The production equipment of composite stretch cotton is characterized by: The invention comprises an unwinding system (1), an automatic opening machine (2) and a compound system (3) which are arranged in sequence, wherein the unwinding system (1) comprises an upper unwinding device (11) and a lower unwinding device (12), the automatic opening machine (2) comprises an upper opening system (21) and a lower opening system (22), the distance between the upper opening system (21) and the lower opening system (22) being greater than the distance between the upper unwinding device (11) and the lower unwinding device (12), the compound system (3) being provided with a compound position, the upper opening system (21) comprising an upper arc support column (211), the upper side of the upper arc support column (211) A plurality of upper support devices (212) are provided at both ends, the lower support system (22) comprises a lower arc support column, a plurality of lower support devices are provided at both ends of the lower side of the lower arc support column, each of the upper arc support columns (211) is provided with a plurality of upper support holes (2111), the upper support holes (2111) are connected to the corresponding upper support devices (212), the upper support holes (2111) and the corresponding upper support devices (212) are respectively located at the two ends of the upper arc support column (211), and each of the upper support devices (212) is used to support the upper support system (21) when the corresponding upper support hole (2111) is closed. The lower arc support column is provided with a plurality of lower support holes, the lower support holes are connected to corresponding lower support devices, the lower support holes and the corresponding lower support devices are respectively located at two ends of the lower arc support column, and each lower support device deflects the edge of the lower support system (22) when the corresponding lower support hole is closed, the upper support device (212) comprises an upper support control box (2121) and an upper support plate (2122), the upper support plate (2122) is rotatably mounted on the upper support control box (2121), and an upper pneumatic plate (21221) is provided on the lower side of the upper support plate (2122). The upper opening control box (2121) is provided with an upper pressure chamber (21211), an upper negative pressure air pipe (21212) and an upper sensing hole air pipe (21213); the upper pneumatic plate (21221) slides along the upper pressure chamber (21211); the upper negative pressure air pipe (21212) and the upper sensing hole air pipe (21213) are both located on one side of the corresponding upper pneumatic plate (21221) of the upper opening control box (2121) close to the middle of the upper arc support column (211); the upper sensing hole air pipe (21213) is connected to the upper opening hole (2111) corresponding to the other end of the upper arc support column (211).

2. The production equipment of composite stretch cotton according to claim 1, characterized in that: The composite system (3) comprises a composite frame (31), a plurality of upper composite devices (32) and a plurality of lower composite devices (33), wherein each upper composite device (32) is mounted on the composite frame (31) in a manner such that it can be lifted, and each lower composite device (33) is mounted on the lower side of a corresponding upper composite device (32) in a manner such that it can be rotated.

3. The production equipment of composite stretch cotton according to claim 2, characterized in that: The upper composite device (32) comprises a composite roller (321), two composite sliders (322) and two lifting screws (323); the lifting screws (323) are rotatably mounted on the composite frame (31); each composite slider (322) is slidably mounted on the composite frame (31); each lifting screw (323) is connected to the corresponding composite slider (322) via a threaded pair transmission; and the composite roller (321) is rotatably mounted between the two composite sliders (322).

4. The production equipment of composite stretch cotton according to claim 1, characterized in that: An upper limit block (212111) is provided in the upper pressure chamber (21211).

5. The production equipment of composite stretch cotton according to claim 1, characterized in that: An upper opening guide edge (21222) is provided on the upper opening plate (2122).

6. The production equipment of composite stretch cotton according to claim 1, characterized in that: The lower support device includes a lower support control box and a lower support plate, the lower support plate is rotatably installed on the lower support control box, a lower pneumatic plate is provided on the lower side of the lower support plate, the lower support control box is provided with a lower pressure chamber, a lower negative pressure air pipe and a lower sensing hole air pipe, the lower pneumatic plate slides along the lower pressure chamber, the lower negative pressure air pipe and the lower sensing hole air pipe are both located on the corresponding lower pneumatic plate of the lower support control box close to the middle part of the lower arc support column, the lower sensing hole air pipe is connected to the corresponding lower support hole at the other end of the lower arc support column.

7. The production equipment of composite stretch cotton according to claim 6, characterized in that: A lower limit block is arranged in the lower pressure chamber.

8. The production equipment of composite stretch cotton according to claim 6, characterized in that: The lower opening plate is provided with a lower opening guide edge.

9. A process for producing composite stretch cotton, using the composite stretch cotton production equipment as claimed in claim 1, characterized in that: The steps include: S1: The two cotton webs are unwound from the upper unwinding device (11) and the lower unwinding device (12) respectively, and the two cotton webs are bypassed from the upper opening system (21) and the lower opening system (22) respectively, and then the two cotton webs are stacked and enter the composite position; S2: the upper support hole (2111) is connected to the negative pressure fan, and the upper support device (212) is deflected toward the edge of the upward support system (21) when the corresponding upper support hole (2111) is closed due to the cotton net obstruction, and the lower support hole is connected to the negative pressure fan, and the lower support device is deflected toward the edge of the downward support system (22) when the corresponding lower support hole is closed due to the cotton net obstruction; S3: The composite system (3) is heated to achieve thermal composite.

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