A production equipment and adjustment method for producing multi-layer non-woven fabrics with high fluffiness

Abstract

The present invention seeks to protect a production device and an adjustment method for producing multi-layer non-woven fabrics with high fluffiness, relating to the technical field of non-woven fabrics. A production device for producing multi-layer non-woven fabrics with high fluffiness includes a first web former. Above the starting end of the first web former, there is a first spunbond spinning unit, and the first spunbond spinning unit is used to lay fibers on the first web former. Above the first web former, there is a upper-layer web former arranged in parallel. Above the upper-layer web former, there are at least two upper-layer spunbond spinning units, and each upper-layer spunbond spinning unit is used to lay fibers on the upper-layer web former. The upper-layer web former is provided with at most one falling opening between two adjacent upper-layer spunbond spinning units. When it is necessary to increase the fluffiness between two certain fiber webs, a falling opening can be opened between the corresponding two upper-layer spunbond spinning units. This application can control the fluffiness of each layer of fiber web, achieving the effect of arbitrary adjustment and improving the softness of the finished product.

Description

Technical Field

[0001] The present invention relates to the technical field of non-woven fabrics, and more specifically, it relates to a production device and an adjustment method for producing multi-layer non-woven fabrics with high fluffiness. Background Art

[0002] The spunbond spinning unit is used to melt the fiber raw material and form filaments, which are then sprayed onto the lapping machine to form a fiber web. When producing multi-layer fiber webs, the traditional method is to set multiple spunbond spinning units on the lapping machine, that is, to directly lay the upper fiber web from the spunbond spinning unit onto the lower fiber web, and finally form a multi-layer fiber web.

[0003] At present, the technological innovation in the field of hygiene materials in China is in a booming development stage. While people are concerned about the product price, they are also pursuing a better touch. The "touch" mentioned here especially takes the fluffiness of the product as the main measurement index.

[0004] In order to pursue a softer fluffiness, the current main method is to adopt the bicomponent non-woven technology, that is, "a functional non-woven fabric formed by extruding two different performance chip raw materials from their respective independent screw extruders, then melt-compounding and spinning into a web, and strengthening". However, the equipment cost brought by this technology is about twice that of conventional equipment, and the spinning stability is relatively sensitive, and problems such as broken filaments and slurry dropping are likely to occur.

[0005] Therefore, how to improve the fluffiness of existing spun products from other perspectives is exactly the technical problem to be solved by this application. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the present invention proposes a production device and an adjustment method for producing multi-layer non-woven fabrics with high fluffiness. By setting an upper lapping machine and opening a falling port on the upper lapping machine, the fluffiness of the non-woven fabric is improved.

[0007] On the one hand, a production device for producing multi-layer non-woven fabrics with high fluffiness is provided, which includes a first lapping machine. Above the starting end of the first lapping machine, a first spunbond spinning unit is provided, and the first spunbond spinning unit is used to lay fibers on the first lapping machine;

[0008] An upper lapping machine is arranged in parallel above the first lapping machine. Above the upper lapping machine, at least two upper spunbond spinning units are provided, and each upper spunbond spinning unit is used to lay fibers on the upper lapping machine;

[0009] The upper lapping machine is provided with at most one falling port between two adjacent upper spunbond spinning units.

[0010] In summary, the above technical solutions have the following beneficial effects: The spunbond spinning unit is used to melt the fiber raw material and then form filaments and spray them onto the lapping machine, thereby forming a fiber web. When producing multiple layers of fiber webs, the traditional lapping machine structure is to set multiple spunbond spinning units on the lapping machine. Since the just-sprayed fiber web is not yet shaped and has a certain amount of heat, it will cause a certain degree of mutual fusion of multiple layers of fiber webs, resulting in a certain loss of fluffiness of the finished product. Secondly, the non-woven fabric produced by the first spinning unit at the starting end of the conveyor belt needs to pass through the suction of each suction air structure along the way during the movement on the conveyor belt, seriously affecting the fluffiness of the fibers. Finally, in the traditional single-layer lapping structure, the more fiber layers there are, the greater the suction force required, the higher the fan power configuration, the higher the energy consumption, and the tighter the fiber layers are adsorbed, the worse the fluffiness.

[0011] In this application, a multi-layer spunbond non-woven fabric is produced by setting an upper lapping machine and at least two upper spunbond spinning units. Each upper spunbond spinning unit corresponds to producing one layer of fiber web. The upper lapping machine is provided with at most one falling opening between two adjacent upper spunbond spinning units, that is, one falling opening can be provided, or no falling opening can be provided. When it is necessary to improve the fluffiness between two certain layers of fiber webs, a falling opening is opened between the corresponding two upper spunbond spinning units.

[0012] According to another aspect of the present invention, a method for adjusting the fluffiness of multi-layer non-woven fabrics is provided. The technical solution is as follows:

[0013] Corresponding numbers of upper spunbond spinning units are set on the upper lapping machine according to the number of layers of the non-woven fabric. Each upper spunbond spinning unit corresponds to spraying one layer of fiber web. When it is necessary to improve the fluffiness between two certain layers of fiber webs, the upper lapping machine opens a falling opening between the corresponding two upper spunbond spinning units.

[0014] In summary, the above technical solutions have the following beneficial effects: After a falling opening is opened on the upper lapping machine, the fiber web on the upper lapping machine in the direction of the starting end of the falling opening will fall from the falling opening onto the first lapping machine. The fallen fibers are only laid on the first lapping machine, so they will be more fluffy. If the fibers on the upper lapping machine do not fall from the falling opening but pass through the upper spunbond spinning unit, then this upper spunbond spinning unit will spray a new fiber web. Since the new fiber web has just been sprayed and is not yet shaped and has residual heat, it will fit more closely with the existing fiber web. In addition, an upper adsorption air duct is also provided at the corresponding upper spunbond spinning unit on the upper lapping machine, and the upper adsorption air duct will also make the multi-layer fiber webs passing through it be adsorbed more closely. This method only needs to set different falling openings to produce non-woven fabrics with different fluffiness and different fluffiness structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the first web laying machine of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0016] Figure 2 Enlarged schematic diagram of the first web laying machine of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0017] Figure 3 Enlarged schematic diagram of the upper web laying machine of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0018] Figure 4 Enlarged schematic diagram of the first fabric guiding frame of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0019] Figure 5 Enlarged schematic diagram of the upper fabric guiding frame of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0020] Figure 6 Schematic diagram of the first example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0021] Figure 7 Schematic diagram of the second example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0022] Figure 8 Schematic diagram of the third example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0023] Figure 9 Schematic diagram of the fourth example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0024] Figure 10 Schematic diagram of the fifth example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0025] Figure 11 Schematic diagram of the sixth example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0026] Figure 12 Schematic diagram of the seventh example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0027] Figure 13 Schematic diagram of the ninth example of non-woven fabric of a production equipment for producing high-bulk multi-layer non-woven fabrics

[0028] Reference numerals: 1, fiber web; 2, large spacing; 3, small spacing; 10, first web laying machine; 11, first frame; 111, first air suction interface; 112, air connection port; 113, air connection pipe; 114, first meltblown air suction interface; 12, first conveyor belt; 13, first roller group; 131, first tensioning roller; 132, first driving roller; 133, first deviation rectifying roller; 134, first supporting roller; 135, height adjusting roller; 136, height adjusting member; 20, first spunbond spinning unit; 30, upper web laying machine; 31, upper frame; 311, upper air suction interface; 312, upper meltblown air suction interface; 32, upper conveyor belt; 321, upper conveyor surface; 322, upper bottom surface; 323, upper inclined surface; 324, lower inclined surface; 33, upper roller group; 331, upper tensioning roller; 332, upper driving roller; 333, upper deviation rectifying roller; 334, upper supporting roller; 335, tensioning member; 3351, connecting rod; 3352, fixed disk; 40, upper spunbond spinning unit; 50, first meltblown spinning unit; 60, upper meltblown spinning unit; 70, first cloth guiding frame; 71, first connecting frame; 72, first supporting block; 73, first front protrusion; 74, first rear protrusion; 80, upper cloth guiding frame; 81, upper connecting frame; 82, upper supporting block; 83, upper front protrusion; 84, upper rear protrusion; 90, falling opening. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 - 5 shown, a production device for producing high-bulk multi-layer non-woven fabrics includes a first web laying machine 10. Above the starting end of the first web laying machine 10, there is provided a first spunbond spinning unit 20 for laying fibers on the first web laying machine 10. Above the first web laying machine 10, an upper web laying machine 30 is arranged in parallel. Above the upper web laying machine 30, there are at least two upper spunbond spinning units 40, and each upper spunbond spinning unit 40 is used for laying fibers on the upper web laying machine 30. The upper web laying machine 30 is provided with at most one falling opening 90 between two adjacent upper spunbond spinning units 40.

[0031] The spunbond spinning unit is used to melt the fiber raw material and form filaments, which are sprayed onto the lapping machine to form the fiber web 1. When producing multiple layers of the fiber web 1, the traditional lapping machine structure is to set multiple spunbond spinning units on the lapping machine. Since the just-sprayed fiber web 1 is not yet shaped and has a certain amount of heat, it will cause a certain degree of mutual fusion of multiple layers of the fiber web 1, resulting in a loss of a certain amount of fluffiness in the finished product. Secondly, the fiber web 1 produced by the first spunbond spinning unit at the starting end of the conveyor belt needs to be sucked by each suction air structure along the way during the movement on the conveyor belt, seriously affecting the fluffiness of the fibers. Finally, in the traditional single-layer lapping structure, as the number of fiber layers increases, the suction force needs to be greater, the fan power configuration is higher, the energy consumption is higher, and the tighter the fiber layer is adsorbed, the worse the fluffiness is.

[0032] In this application, a multi-layer spunbond non-woven fabric is produced by setting an upper lapping machine 30 and at least two upper spunbond spinning units 40. Each upper spunbond spinning unit 40 corresponds to producing one layer of the fiber web 1. The upper lapping machine 30 is provided with at most one falling opening 90 between two adjacent upper spunbond spinning units 40, that is, one falling opening 90 can be provided, or the falling opening 90 can not be provided. When it is necessary to improve the fluffiness between two certain layers of the fiber web 1, just provide the falling opening 90 between the corresponding two upper spunbond spinning units 40.

[0033] The first spunbond spinning unit 20 generates the fiber web 1 at the bottom layer of the non-woven fabric on the first lapping machine 10, which is also the first layer of the fiber web 1. The upper spunbond spinning unit 40 closest to the first spunbond spinning unit 20 is the first upper spunbond spinning unit 40, and they are sorted in order from near to far. The farther the upper spunbond spinning unit 40 is from the first spunbond spinning unit 20, the higher the fiber web 1 it generates is in the non-woven fabric. Above the first layer of the fiber web 1 is the second layer of the fiber web 1, and they are sorted in order from near to far.

[0034] Example 1:

[0035] When there are two upper spunbond spinning units 40, the upper lapping machine 30 provides one falling opening 90 between the two upper spunbond spinning units 40, and the produced non-woven fabric is the softest. As Figure 6 shown, a large spacing 2 is formed between each layer of the fiber web 1.

[0036] Example 2:

[0037] When the two upper lapping machines 30 do not provide the falling opening 90, one side of the produced non-woven fabric is relatively soft and the other side is relatively tight. As Figure 7 shown, a large spacing 2 is formed between the first layer of the fiber web 1 and the second layer of the fiber web 1, and a small spacing 3 is formed between the second layer of the fiber web 1 and the third layer of the fiber web 1.

[0038] Example 3:

[0039] When there are three upper spunbond spinning units 40, a dropping opening 90 is provided between every two adjacent upper spunbond spinning units 40 of the upper lapping machine 30, and the produced non-woven fabric is the softest. As Figure 8 shown, large spacings 2 are formed between all four fiber webs 1.

[0040] Example 4:

[0041] The upper lapping machine 30 is provided with a dropping opening 90 between the first and the second upper spunbond spinning units 40. One side of the produced non-woven fabric is relatively soft and the other side is relatively dense. As Figure 9 shown, large spacings 2 are formed between the first, the second and the third fiber webs 1, and a small spacing 3 is formed between the third fiber web 1 and the fourth fiber web 1.

[0042] Example 5:

[0043] The upper lapping machine 30 is provided with a dropping opening 90 between the second and the third upper spunbond spinning units 40. Both sides of the produced non-woven fabric are relatively soft and the middle part is relatively dense. As Figure 10 shown, a large spacing 2 is formed between the first fiber web 1 and the second fiber web 1, a small spacing 3 is formed between the second fiber web 1 and the third fiber web 1, and a large spacing 2 is formed between the third fiber web 1 and the fourth fiber web 1.

[0044] Example 6:

[0045] The upper lapping machine 30 is not provided with a dropping opening 90. One side of the produced non-woven fabric is relatively soft and the other side is relatively dense. As Figure 11 shown, a large spacing 2 is formed between the first fiber web 1 and the second fiber web 1, and small spacings 3 are formed between the second, the third and the fourth fiber webs 1.

[0046] When the fluffiness structure of the non-woven fabric needs to be adjusted in this application, only the upper conveyor belt 32 needs to be separated at the place where the dropping opening 90 needs to be provided, and then the separated upper lapping machines 30 are respectively connected by an upper conveyor belt 32. By replacing the upper conveyor belt 32, the cost is much lower than that of the existing method for improving the fluffiness, achieving the effects of reducing the production cost, arbitrarily adjusting and enhancing the softness of the finished product. The equipment of this application can change the product performance according to needs, increase the types of the finished products, improve the production efficiency, and has a very broad market prospect.

[0047] Wherein, when the conveyor belt on the frame rotates clockwise, the left side of the lapping machine and the frame is the starting end and the right side is the ending end. When the conveyor belt on the frame rotates counterclockwise, the right side of the lapping machine and the frame is the starting end and the left side is the ending end.

[0048] Specifically, the wall panels on both sides of the upper frame 31 and the wall panels on both sides of the first frame 11 are connected in parallel.

[0049] The upper web laying machine 30 includes an upper frame 31 corresponding to the upper spunbond spinning unit 40 one by one, each upper frame 31 is provided with an upper roller group 33, and the upper roller group 33 is provided with a closed upper conveyor belt 32; the upper conveyor belt 32 forms an upper conveying surface 321 above the upper frame 31, and forms an upper bottom surface 322 below the upper frame 31; there is a spacing between each upper frame 31 for the opening of the drop port 90, the upper conveyor belt 32 is separated at the drop port 90, and the upper conveying surface 321 and the upper bottom surface 322 on the same side of the drop port 90 are connected to form a closed upper conveyor belt 32.

[0050] The upper racks 31 all include a starting end and an end, and are oriented in the same direction. Each upper rack 31 is used for reconnecting the separated upper conveyor belts. Furthermore, the starting end of each upper rack 31 is oriented toward the end of the first rack 11. The transport direction of the upper web laying machine 30 is parallel to that of the first rack 11, and the speed is the same, but the direction is opposite, so that the fiber web 1 dropped from the upper rack 31 can be transported on the first rack 11 for another distance, and this distance does not require increasing the length of the first rack 11, and this transport distance allows the transferred fiber web 1 to have a certain amount of time to fit together, so that the multi-layer fiber web 1 will not be easily delaminated.

[0051] Specifically, the upper roller group 33 includes an upper tensioning roller 331, an upper active roller 332, an upper deflection correction roller 333 and a plurality of upper support rollers 334, each of which is arranged on the inner side of the upper conveyor belt 32, so as to stretch out the upper conveyor belt 32 and make the upper conveyor belt 32 form an upper conveying surface 321 for transporting the fiber web 1 above the upper frame 31; the upper active roller 332 is in contact with the upper conveyor belt 32, and is used to drive the upper conveyor belt 32 to be transported, and the upper deflection correction roller 333 is in contact with the upper conveyor belt 32, and is used to guide the upper conveyor belt 32 to be transported in the middle of the upper deflection correction roller 333; the upper tensioning roller 331 is in contact with the upper conveyor belt 32, and the upper tensioning roller 331 is used to move to the outside of the upper conveyor belt 32 to tighten the upper conveyor belt 32, or to move to the inside of the upper conveyor belt 32 to loosen the upper conveyor belt 32.

[0052] Specifically, each upper support roller 334 is arranged on the inner side of the upper conveyor belt 32 , and the upper active roller 332 is driven by a motor to roll, thereby driving the upper conveyor belt 32 to move.

[0053] Specifically, the upper deflection correction roller 333 is arranged on the inner side of the upper conveyor belt 32 and is adjacent to the upper active roller 332. The upper deflection correction roller 333 has a structure that is thick in the middle and thin on both sides. It is used to automatically correct the offset of the upper conveyor belt 32, so that the deviation degree of the upper conveyor belt 32 is controlled within a limited range under high-speed operation conditions, thereby protecting the upper conveyor belt 32 from being damaged.

[0054] Specifically, the upper tensioning roller 331 is connected to the upper frame 31 through a tensioning member 335. The tensioning member 335 includes a connecting rod 3351 and a fixed disk 3352. The fixed disk 3352 is fixed to the end of the upper frame 31. One end of the connecting rod 3351 is detachably fixedly connected to the fixed disk 3352, and the other end is connected to the upper tensioning roller 331, so as to adjust the distance between the upper tensioning roller 331 and the fixed disk 3352.

[0055] Specifically, the fixed plate 3352 is provided with a hole for the connecting rod 3351 to pass through in the horizontal direction. The connecting rod 3351 has a thread. The position of the connecting rod 3351 and the fixed plate 3352 is controlled by a nut. The horizontal position of the upper tensioning roller 331 is controlled by adjusting the nut to achieve a tensioning effect.

[0056] Specifically, the upper tensioning roller 331 is located on the inner side of the upper conveyor belt 32. Since the upper conveyor belt 32 is of moderate length, the upper tensioning roller 331 is tightened from the inside to the outside. This saves two upper support rollers 334 compared to the first tensioning roller 131.

[0057] The first web laying machine 10 includes a first frame 11, a first conveyor belt 12 and a first roller group 13. The first roller group 13 is arranged on the first frame 11. The first conveyor belt 12 is arranged on the first roller group 13 and forms a first conveying surface for transporting the fiber web 1 above the first frame 11. The first roller group 13 is used to drive the first conveyor belt 12 to rotate in a circular manner.

[0058] Specifically, the first conveyor belt 12 is connected end to end to form a circle.

[0059] Specifically, the first roller group 13 includes a first tensioning roller 131, a first active roller 132, a first deviation correcting roller 133 and a plurality of first support rollers 134. Each first support roller 134 is in contact with the first conveyor belt 12, and is used to stretch the first conveyor belt 12 and enable the first conveyor belt 12 to form a conveying surface for transporting the fiber web 1 above the first frame 11.

[0060] Specifically, the first driving roller 132 abuts against the first conveyor belt 12 and is used to drive the first conveyor belt 12 to convey. The first deviation-correcting roller 133 abuts against the first conveyor belt 12 and is used to guide the first conveyor belt 12 to convey in the middle of the first deviation-correcting roller 133. The first tensioning roller 131 abuts against the first conveyor belt 12. The first tensioning roller 131 is used to move inward to the first conveyor belt 12 to tension the first conveyor belt 12, or is used to move outward to the first conveyor belt 12 to relax the first conveyor belt 12.

[0061] Specifically, each of the first supporting rollers 134 is located inside the first conveyor belt 12 and abuts against the first conveyor belt 12.

[0062] Specifically, the first driving roller 132 is arranged inside the first conveyor belt 12. The first driving roller 132 is driven by a motor to roll, so as to drive the first conveyor belt 12 to move. The first deviation-correcting roller 133 is used to automatically correct the deviation amount of the first conveyor belt 12, so that the deviation degree of the first conveyor belt 12 under the condition of high-speed operation is controlled within a limited range, thereby protecting the first conveyor belt 12 from being damaged.

[0063] Specifically, the first deviation-correcting roller 133 is arranged outside the first conveyor belt 12. The first deviation-correcting roller 133 is arranged adjacent to the first driving roller 132, that is, in front of or behind the first driving roller 132, preferably behind. The direction in which the first driving roller 132 drives the first conveyor belt 12 to move is the front. The first deviation-correcting roller 133 also squeezes the first conveyor belt 12 inward. Specifically, the included angle between the first conveyor belt 12 between the first driving roller 132 and the first deviation-correcting roller 133 and the first conveyor belt 12 on the side of the first driving roller 132 away from the first deviation-correcting roller 133 is an acute angle, and the included angle between the first conveyor belt 12 between the first driving roller 132 and the first deviation-correcting roller 133 and the first conveyor belt 12 on the side of the first deviation-correcting roller 133 away from the first driving roller 132 is an acute angle, so that the contact area between the first conveyor belt 12 and the first driving roller 132 is larger, and the contact area between the first conveyor belt 12 and the first deviation-correcting roller 133 is also larger.

[0064] Specifically, the first tensioning roller 131 is arranged on the outer side below the first conveyor belt 12. There are two first supporting rollers 134 on both sides of the first tensioning roller 131. Telescopic lifting members are arranged at both ends of the first tensioning roller 131. The lifting members are the same as the height adjusting members 136 but are not shown in the drawings. The lifting members are controlled by accessories such as cylinders, slide rails or lifting screw rods that can control translation. The lifting members are used to drive the first tensioning roller 131 to move in the vertical direction. The lifting members can automatically adjust the first tensioning roller 131 to rise or fall, and automatically adjust the tension of the first conveyor belt 12 to maintain it within a stable range value. Since the first conveyor belt 12 is relatively long, the first tensioning roller 131 is arranged on the outer side of the first conveyor belt 12 and tightened inward. The first supporting rollers 134 on both sides of the first tensioning roller 131 are as close as possible to the first tensioning roller 131. Preferably, the first tensioning roller 131 is tangent to the first supporting rollers 134 on both sides in the vertical direction, so that the moving distance of the first tensioning roller 131 can produce an effect of doubling the tensioning distance on the first conveyor belt 12.

[0065] Further, the first roller group 13 further includes a plurality of first height adjusting rollers 135 arranged on the first frame 11. The first height adjusting rollers 135 are arranged in one-to-one correspondence with the upper layer frame 31. The first height adjusting rollers 135 are used to abut against the first conveying surface of the first conveyor belt 12, so as to adjust the distance between the first conveying surface of the first conveyor belt 12 and the upper conveyor belt 32.

[0066] Specifically, the first height adjusting rollers 135 are all located inside the conveying surface of the first conveyor belt 12. Both ends of the first height adjusting roller 135 are connected with height adjusting members 136. The height adjusting members 136 are used to drive the first height adjusting roller 135 to move in the height direction. The height adjusting members 136 can be accessories such as cylinders and telescopic rods, and then directly connected to the first height adjusting roller 135 for height adjustment, or the height adjusting members 136 are cylinders, telescopic members, motors connected to the first height adjusting roller 135 through intermediate members for height adjustment. The intermediate members are accessories such as slide rails, lifting screw rods, and lever structures that can cooperate with the height adjusting members 136 to move. The height adjusting members 136 can also be structures without power devices such as slide rails, lifting screw rods, lever structures, and bolts for fixing the height, and are adjusted manually. Any method of controlling the movement of the height adjusting members 136 should be within the protection scope of this application.

[0067] Embodiment Seven:

[0068] As Figure 12 shown, the upper conveyor belt 32 forms an upper bottom surface 322 below the upper layer frame 31. The first height adjusting roller 135 is located within the orthographic projection interval of the upper bottom surface 322 in the horizontal direction.

[0069] The first height-adjusting roller 135 is located within a quarter range on the side of the positive projection close to the end of the upper frame 31. The first height-adjusting roller 135 is located within a quarter range on the side of the positive projection interval close to the end of the upper frame 31. This positive projection interval is the positive projection interval formed by the upper bottom surface of the first height-adjusting roller 135 corresponding to the upper frame 31 in the horizontal direction, and the end of the upper frame 31 is also the end direction of the first height-adjusting roller 135 corresponding to the upper frame. The fiber web 1 generally falls within a quarter distance of the displacement of the upper bottom surface of the upper frame 64. Therefore, setting the first height-adjusting roller 138 within this distance range is beneficial to adjusting the height between the first conveyor belt 12 and the landing point of the fiber web 1, so as to reach an appropriate height and make the fiber web 1 fall more smoothly.

[0070] Example Eight:

[0071] The upper tension roller 331 abuts against the upper conveyor belt 32 at the end of the upper frame 31. The upper conveyor belt 32 is separated by the upper tension roller 331 at the end of the upper frame 31 to form an upper inclined surface 323 above the upper tension roller 331 and a lower inclined surface 324 below the upper tension roller 331. The upper conveyor belt 32 forms an upper bottom surface 322 below the upper frame 31. The first height-adjusting roller 135 is located directly below the connection of the upper bottom surface 322 and the lower inclined surface 324. The fiber web 1 is generally peeled off at the upper bottom surface 322. Example Seven is the preferred solution, and Example Eight is the second best.

[0072] Example Nine:

[0073] As Figure 13 shown, the first height-adjusting roller 135 is located within the projection interval of the horizontal positive projection of the lower inclined surface 324. Since there is no structure in this application to control the peeling of the fiber web 1, the peeling of the fiber web 1 is related to the speed of the upper conveyor belt 32, the thickness of the fiber web 1, the angle of the lower inclined surface 324, the air permeability of the upper conveyor belt 32, the number of conductive wires inside the upper conveyor belt 32, and the humidity of the weather. If the fiber web 1 still peels off at the lower inclined surface 324 after the equipment is debugged, then the position of the first height-adjusting roller 135 adopts the position described in Example Nine.

[0074] Furthermore, the first height-adjusting roller 135 is located between the midline of the projection interval and the end of the projection interval far from the upper tension roller 331. This distance is close to the landing point of the upper fiber web 1, which is beneficial to adjusting the height between the landing point and the first conveyor belt 12.

[0075] It is unpredictable whether the fiber web 1 on the upper layer will wrinkle when it falls from a certain height onto the first conveyor belt 12. Therefore, after the upper layer frame 31 is debugged, the height of the first conveyor belt 12 needs to be adjusted to find the most suitable height. The landing point of the upper fiber web 1 is generally at the upper bottom surface 322. However, due to its relation with many factors, the final landing point is always unpredictable and can only be known after the equipment is debugged and started. After operation, the landing points of the fiber webs 1 in the same batch are the same. Therefore, three solutions, namely Embodiment Seven, Embodiment Eight, and Embodiment Nine, are provided.

[0076] A first adsorption air duct is arranged in the first frame 11. One end of the first adsorption air duct is located below the conveying surface of the first conveyor belt 12 and is aligned with the first spunbond spinning unit 20, and the other end forms a first air suction interface 111 on one side or both sides of the first frame 11; an upper layer adsorption air duct is arranged in the upper layer frame 31. One end of the upper layer adsorption air duct is located below the conveying surface of the upper layer conveyor belt 32 and is aligned with the corresponding upper layer spunbond spinning unit 40, and the other end forms an upper layer air suction interface 311 on one side or both sides of the upper layer frame 31; the first frame 11 is provided with an air receiving port 112 below the upper layer air suction interface 311, and the air receiving port 112 is connected to the upper layer air suction interface 311 through an air receiving pipe 113.

[0077] The designs of the first adsorption air duct and the upper layer adsorption air duct refer to existing designs and are not shown in the drawings. For example, the suction air diversion device with the publication number "CN217077974U" includes a wind guiding component and a stepped air suction design. The first adsorption air duct is aligned with the first spunbond spinning unit 20, and the upper layer adsorption air duct is aligned with the upper layer spunbond spinning unit 40. After the first air suction interface 111 is connected to the air suction port of the fan, the fiber web 1 on the first conveyor belt 12 can be adsorbed. To avoid the air discharged from the upper layer air suction interface 311 affecting the lower layer fiber web 1, the air receiving pipe 113 is designed to discharge the air from the upper layer adsorption air duct through the first frame 11 to the two sides or downward. The existing production method of multi-layer spunbond nets is to lay the nets through multiple spunbond spinning units on the same laying machine. Therefore, the laying machine needs to be provided with adsorption air ducts at corresponding positions below each spunbond spinning unit. In this way, the fiber web 1 on the bottom layer has to pass through each adsorption air duct, and when the subsequent adsorption air ducts adsorb the fiber web 1, the multi-layer fiber webs 1 are already in an overlapping state, which will cause the multi-layer fiber webs 1 to be adsorbed more tightly, resulting in a serious reduction in fluffiness. In this application, through the design of the upper layer frame 31, each layer of fiber web 1 is only adsorbed at the initial end of the conveyor belt in sequence. Because it is necessary to avoid the airflow of the spunbond spinning unit affecting the web turning of the fiber web 1, no further adsorption is required during the subsequent transportation process, and there will be no situation where the overlapping fiber webs 1 are adsorbed.

[0078] Above the first conveyor belt 12, a first meltblown spinning unit 50 is further provided. The first meltblown spinning unit 50 is located on one side of the first spunbond spinning unit 20 in the transportation direction towards the first conveyor belt 12. Below the first meltblown spinning unit 50, the first frame 11 is provided with a first meltblown adsorption air duct; one end of the first meltblown adsorption air duct is located below the first conveyor belt 12 and is aligned with the first meltblown spinning unit 50, and the other end forms a first meltblown air suction interface 114 on one side or both sides of the first frame 11; above the upper conveyor belt 32, an upper meltblown spinning unit 60 is further provided. The upper meltblown spinning unit 60 is located on one side of the upper spunbond spinning unit 40 in the transportation direction towards the upper conveyor belt 32. Below the upper meltblown spinning unit 60, the upper frame 31 is provided with an upper meltblown adsorption air duct; one end of the upper meltblown adsorption air duct is located below the upper conveyor belt 32 and is aligned with the upper meltblown spinning unit 60, and the other end forms an upper meltblown air suction interface 312 on one side or both sides of the upper frame 31; the air intake port 112 of the first frame 11 is also correspondingly opened opposite to the upper meltblown air suction interface 312 and is connected to the upper meltblown air suction interface 312 through an air connection pipe 113.

[0079] The meltblown spinning unit is an optional component. Its main function is to heat and melt granular polymers and extrude them into several continuous fiber melt streams, which are finally drawn into dense fibers with a diameter of about - microns by high-speed hot air and randomly laid into a web.

[0080] At the starting end of the first web laying machine 10, a first fabric guiding frame 70 is provided, and the first fabric guiding frame 70 is used for placing fabric rolls. Specifically, the first fabric guiding frame 70 is arranged at the starting end of the first frame 11.

[0081] The first fabric guiding frame 70 includes a first connecting frame 71 at the starting end of the first web laying machine 10 and first supporting blocks 72 above both sides of the first connecting frame 71. On the side of the first supporting block 72 close to the first web laying machine 10, a first front protrusion 73 is formed upward, and on the side of the first supporting block 72 away from the first web laying machine 10, a first rear protrusion 74 is formed upward. A groove for supporting the fabric roll is formed between the first front protrusion 73 and the first rear protrusion 74, and the height of the first front protrusion 73 is greater than the height of the first rear protrusion 74. After the fabric roll is placed in the groove of the first supporting block 72, it can rotate and convey the rolled fabric driven by the first conveyor belt 12. The height of the first front protrusion 73 being greater than the height of the first rear protrusion 74 can prevent the rolled fabric from being pulled out of the groove.

[0082] At the starting end of the upper web laying machine 30, an upper fabric guiding frame 80 is provided, and the upper fabric guiding frame 80 is used for placing fabric rolls. Specifically, the upper web laying machine 30 has an initial starting end. When a falling opening 90 is provided on the upper web laying machine 30, a new starting end will be formed, and an upper fabric guiding frame 80 also needs to be provided at the new starting end.

[0083] The upper cloth guiding frame 80 includes an upper connecting frame 81 located at the starting end of the upper web laying machine 30 and upper supporting blocks 82 located on both sides of the upper connecting frame 81. The upper supporting block 82 forms an upper front protrusion 83 on the side close to the upper web laying machine 30, and forms an upper rear protrusion 84 on the side away from the upper web laying machine 30. A groove for supporting the cloth roll is formed between the upper front protrusion 83 and the upper rear protrusion 84, and the height of the upper front protrusion 83 is greater than the height of the upper rear protrusion 84.

[0084] Furthermore, an upper connecting frame 81 is provided at the starting end of each upper frame 31, and the uppermost portion of the upper supporting block 82 is lower than the upper conveying surface 321 of the upper conveyor belt 32. Specifically, the upper front protrusion 83 is lower than the upper conveying surface 321 of the upper conveyor belt 32. In this way, when there is no drop opening 90 between the two upper frames 31, the upper cloth guide frame 80 will not affect the operation of the upper conveyor belt 32, so that the upper frame 31 can be always equipped with the upper cloth guide frame 80, and there is no need to install or disassemble the upper cloth guide frame 80 due to the opening or non-opening of the drop opening 90.

[0085] After the cloth roll is placed in the groove of the upper support block 82, it can be rotated and transported under the drive of the upper conveyor belt 32. The height of the upper front protrusion 83 is greater than the height of the upper rear protrusion 84, which can prevent the cloth roll from being pulled out of the groove.

[0086] The first cloth guide rack 70 and the upper cloth guide rack 80 are both used to place cloth rolls. When the equipment is turned on, the spun fibers are unstable and have uneven heights, or are too hot and in a molten state, or the temperature is not high enough. The fiber web 1 formed by the unstable spun fibers has uneven fluffiness, and the fibers that are too hot will stick to the conveyor belt, affecting the fluffiness of the fibers after they are webbed. Therefore, the fibers cannot be laid on the conveyor belt after the equipment is started. By laying the cloth roll flat on the conveyor belt, the conveyor belt can be protected from being damaged or stuck by the high-temperature melt dripping from above, and it can also be used to receive waste that cannot be formed. After the spun fibers are stable, the cloth roll is cut off from the starting end, and the cloth roll and the waste on the cloth roll are moved to the end as the conveyor belt moves and can be removed manually.

[0087] According to another aspect of the present invention, there is provided a method for adjusting the bulkiness of a multi-layer nonwoven fabric, comprising the following steps:

[0088] St10. According to the number of layers of the non-woven fabric, a corresponding number of upper spunbond spinning units 40 are arranged on the upper web laying machine 30. Each upper spunbond spinning unit 40 sprays out a layer of fiber web 1. When it is necessary to increase the fluffiness between two layers of fiber web 1, the upper web laying machine 30 opens a drop port 90 between the corresponding two upper spunbond spinning units 40.

[0089] The lower layer cross-lapper also produces a single layer of web, and the number of upper layer cross-lappers 30 is one less than the number of non-woven fabric layers.

[0090] After a dropping opening 90 is formed on the upper layer cross-lapper 30, the fiber web 1 on the upper layer cross-lapper 30 in the direction of the starting end of the dropping opening 90 will fall from the dropping opening 90 onto the first cross-lapper 10. The fibers that fall down are only laid on the first cross-lapper 10, so they will be more fluffy. If the fibers on the upper layer cross-lapper 30 do not fall from the dropping opening 90 but pass through the upper spunbond spinning unit 40, then the upper spunbond spinning unit 40 will eject a new fiber web 1. Since the new fiber web 1 has just been ejected and is not yet shaped and has residual heat, it will adhere more closely to the existing fiber web 1. In addition, an upper adsorption air duct is provided at the corresponding upper spunbond spinning unit 40 of the upper layer cross-lapper 30, and the upper adsorption air duct will also make the multi-layer fiber webs 1 passing through it adhere more closely. By simply setting different dropping openings 90, non-woven fabrics with different fluffiness and different fluffiness structures can be produced.

[0091] St20. The upper layer cross-lapper 30 includes upper racks 31 corresponding one by one to the upper spunbond spinning units 40. Upper roller groups 33 are provided on each of the upper racks 31, and a closed upper conveyor belt 32 is provided on the upper roller groups 33; the upper driving rollers 332 in the upper roller groups 33 are all located at the ends of the upper racks 31. Each closed upper conveyor belt 32 is only connected to the upper driving roller 332 on one upper rack 31, and the upper driving rollers 332 not connected to the upper conveyor belt 32 are controlled to stop rotating.

[0092] The upper racks 31 face the same direction, and the upper driving rollers 332 are all located at the ends of the upper racks 31. Each closed upper conveyor belt 32 will only be connected to the upper driving roller 332 on the last upper rack 31 in the direction of the end of the upper racks 31. Therefore, only by controlling the operation of this upper driving roller 332 to drive the corresponding upper conveyor belt 32 to rotate, the other upper driving rollers 332 can be stopped from rotating, saving energy consumption.

[0093] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A production device for producing multi-layer non-woven fabrics with high fluffiness, characterized in that, It includes a first cross-lapper (10), and above the starting end of the first cross-lapper (10), there is a first spunbond spinning unit (20) for laying fibers on the first cross-lapper (10). Above the first cross-lapper (10), there is a parallel upper cross-lapper (30), and above the upper cross-lapper (30), there are at least two upper spunbond spinning units (40), each of which is used for laying fibers on the upper cross-lapper (30). The upper cross-lapper (30) is provided with at most one falling opening (90) between two adjacent upper spunbond spinning units (40). The upper cross-lapper (30) includes upper frames (31) corresponding to the upper spunbond spinning units (40) one by one. On each of the upper frames (31), there is an upper roller group (33), and on the upper roller group (33), there is a closed upper conveyor belt (32). The upper conveyor belt (32) forms an upper conveying surface (321) above the upper frame (31) and an upper bottom surface (322) below the upper frame (31). There is a spacing between adjacent upper frames (31) for the falling opening (90) to be opened. The upper conveyor belt (32) is separated at the falling opening (90), and the upper conveying surface (321) and the upper bottom surface (322) on the same side of the falling opening (90) are connected to form a closed upper conveyor belt (32). The first cross-lapper (10) includes a first frame (11), a first conveyor belt (12), and a first roller group (13). The first roller group (13) is arranged on the first frame (11), and the first conveyor belt (12) is arranged on the first roller group (13) to form a first conveying surface for transporting the fiber web above the first frame (11). The first roller group (13) is used to drive the first conveyor belt (12) to rotate in a cycle. The first roller group (13) further includes a number of first height-adjustable rollers (135) arranged on the first frame (11). The first height-adjustable rollers (135) are arranged corresponding to the upper frames (31) one by one. The first height-adjustable rollers (135) are used to abut against the first conveying surface of the first conveyor belt (12) to adjust the distance between the first conveying surface of the first conveyor belt (12) and the upper conveyor belt (32). The upper roller group (33) includes an upper tensioning roller (331). The upper tensioning roller (331) abuts against the upper conveyor belt (32) at the end of the upper frame (31). The upper conveyor belt (32) is separated by the upper tensioning roller (331) at the end of the upper frame (31) to form an upper inclined surface (323) above the upper tensioning roller (331) and a lower inclined surface (324) below the upper tensioning roller (331). The upper conveyor belt (32) forms an upper bottom surface (322) below the upper frame (31). The first height-adjustable roller (135) is located directly below the connection between the upper bottom surface (322) and the lower inclined surface (324).

2. The production equipment for producing a multi-layer non-woven fabric with high bulkiness according to claim 1, characterized in that, A first adsorption air duct is arranged in the first frame (11). One end of the first adsorption air duct is located below the conveying surface of the first conveyor belt (12) and is aligned with the first spunbond spinning unit (20), and the other end forms a first air suction interface (111) on one or both sides of the first frame (11). An upper-layer adsorption air duct is arranged in the upper-layer frame (31). One end of the upper-layer adsorption air duct is located below the conveying surface of the upper-layer conveyor belt (32) and is aligned with the corresponding upper-layer spunbond spinning unit (40), and the other end forms an upper-layer air suction interface (311) on one or both sides of the upper-layer frame (31). The first frame (11) is provided with an air inlet (112) below the upper-layer air suction interface (311), and the air inlet (112) is connected to the upper-layer air suction interface (311) through an air connection pipe (113).

3. A production device for producing a multi-layer non-woven fabric with high bulkiness according to claim 1, characterized in that, A first cloth guiding rack (70) is arranged at the starting end of the first web laying machine (10), and a cloth roll is placed on the first cloth guiding rack (70).

4. A production device for producing multi-layer non-woven fabrics with high bulkiness according to claim 3, characterized in that, The first cloth guiding rack (70) includes a first connecting rack (71) at the starting end of the first web laying machine (10) and first supporting blocks (72) above both sides of the first connecting rack (71). One side of the first supporting block (72) close to the first web laying machine (10) forms a first front protrusion (73) upward, and one side of the first supporting block (72) away from the first web laying machine (10) forms a first rear protrusion (74) upward. A groove for supporting the cloth roll is formed between the first front protrusion (73) and the first rear protrusion (74), and the height of the first front protrusion (73) is greater than the height of the first rear protrusion (74).

5. The production equipment for producing a multi-layer non-woven fabric with high bulkiness according to claim 1, characterized in that, An upper-layer cloth guiding rack (80) is arranged at the starting end of the upper-layer web laying machine (30), and a cloth roll is placed on the upper-layer cloth guiding rack (80).

6. The production equipment for producing a multi-layer non-woven fabric with high fluffiness according to claim 5, characterized in that, The upper-layer cloth guiding rack (80) includes an upper-layer connecting rack (81) at the starting end of the upper-layer web laying machine (30) and upper-layer supporting blocks (82) above both sides of the upper-layer connecting rack (81). One side of the upper-layer supporting block (82) close to the upper-layer web laying machine (30) forms an upper-layer front protrusion (83) upward, and one side of the upper-layer supporting block (82) away from the upper-layer web laying machine (30) forms an upper-layer rear protrusion (84) upward. A groove for supporting the cloth roll is formed between the upper-layer front protrusion (83) and the upper-layer rear protrusion (84), and the height of the upper-layer front protrusion (83) is greater than the height of the upper-layer rear protrusion (84).

7. A method for adjusting the fluffiness of multi-layer non-woven fabric, according to a production device for producing high-fluffiness multi-layer non-woven fabric according to any one of claims 1-6, characterized in that, Corresponding numbers of upper-layer spunbond spinning units (40) are arranged on the upper-layer web laying machine (30) according to the number of non-woven fabric layers. Each upper-layer spunbond spinning unit (40) sprays out a fiber web. When it is necessary to improve the fluffiness between two certain fiber webs, the upper-layer web laying machine (30) opens a falling port (90) between the corresponding two upper-layer spunbond spinning units (40).

8. A method for adjusting the fluffiness of multi-layer non-woven fabric according to claim 7, characterized in that, The upper-layer web laying machine (30) includes upper-layer frames (31) corresponding one by one to the upper-layer spunbond spinning units (40). An upper-layer roller group (33) is arranged on each of the upper-layer frames (31), and a closed upper-layer conveyor belt (32) is arranged on the upper-layer roller group (33). The upper driving rollers (332) in the upper roller group (33) are all located at the end of the upper frame (31). Each closed upper conveyor belt (32) is only connected to the upper driving roller (332) on one upper frame (31), and the rotation of the upper driving rollers (332) not connected to the upper conveyor belt (32) is controlled to stop.

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