Multi-layer co-extrusion composite sheet production line

Abstract

The utility model discloses a multi-layer co-extrusion composite sheet production line which comprises an extrusion unit, an unwinding unit, a three-roller calender, a cooling shaping unit located at the downstream of the three-roller calender and a winding machine located at the downstream of the cooling shaping unit. The extruding unit comprises a first extruding machine, a second extruding machine, a third extruding machine, a first extruding die and a second extruding die, the first extruding die and the second extruding die are oppositely arranged front and back, the first extruding machine and the second extruding machine are simultaneously communicated with the first extruding die, and the third extruding machine is communicated with the second extruding die; the unwinding unit comprises two unwinding machines; the three-roller calender is arranged between the first extrusion die and the second extrusion die and comprises an upper roller, a middle roller and a lower roller which are sequentially arranged from top to bottom; the cooling and shaping unit comprises a cooling bracket and a traction machine arranged at the rear end part of the cooling bracket; a space for accommodating one unreeling machine is formed below at least part of the cooling bracket; the device is simple in structure, low in cost, small in occupied area and multipurpose.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polymer material processing equipment, in particular to a multi-layer co-extrusion composite sheet production line. BACKGROUND

[0002] The traditional multi-layer sheet production line often adopts five-roller machine compounding, sheet offline coating and compounding and other production methods. Such production line is backward in technology, low in production efficiency, and the produced composite sheet has low peeling strength, which is not suitable for the market demand of high yield, low energy consumption and multi-functional equipment. SUMMARY

[0003] In order to solve the above technical problems, the purpose of the present application is to provide a multi-layer co-extrusion composite sheet production line which can strengthen the uniformity of the interlayer bonding of the product, has small floor area and realizes one machine with multiple functions.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme: a multi-layer co-extrusion composite sheet production line, comprising:

[0005] An extrusion unit comprising a first extruder, a second extruder, a third extruder, and a first extrusion die and a second extrusion die arranged opposite to each other, wherein the first extruder and the second extruder are in communication with the first extrusion die, and the third extruder is in communication with the second extrusion die;

[0006] A winding unit comprising two winding machines, each of which has two winding stations, and each winding machine is configured to alternately wind the two winding stations;

[0007] A three-roller calender arranged between the first extrusion die and the second extrusion die, wherein the three-roller calender comprises an upper roller, a middle roller and a lower roller arranged in sequence from top to bottom, the extrusion outlet of the first extrusion die is aligned with the gap between the upper roller and the middle roller from the front side of the three-roller calender, and the extrusion outlet of the second extrusion die is aligned with the gap between the middle roller and the lower roller from the rear side of the three-roller calender;

[0008] A cooling and shaping unit located downstream of the three-roller calender, wherein the cooling and shaping unit comprises a cooling bracket and a traction machine arranged at the rear end of the cooling bracket, the front end of the cooling bracket is detachably connected to the top of the three-roller calender, at least part of the space below the cooling bracket accommodates a winding machine, and

[0009] A winding machine arranged downstream of the cooling and shaping unit.

[0010] In the above technical solution, further preferably, the first extruder, the second extruder and the third extruder are arranged in sequence from front to back, and are arranged on the left side or the right side of the three-roller calender.

[0011] In the above technical solution, further preferably, the third extruder and the bottom of the second extrusion die are provided with a first moving mechanism, and the third extruder and the second extrusion die are configured to be movable in the front-back direction through the first moving mechanism.

[0012] In the above technical solution, further preferably, the bottom of the three-roller calender is provided with a second moving mechanism, and the three-roller calender is configured to be movable in the front-back direction through the second moving mechanism.

[0013] In the above technical solution, further preferably, the two unwinders are arranged on the front side and the rear side of the three-roller calender respectively.

[0014] In the above technical solution, further preferably, the cooling bracket comprises a first support frame, a second support frame and a plurality of cooling rollers, the second support frame is located on the rear side of the first support frame and extends in the front-back direction, a part of the cooling rollers are rotatably installed on the second support frame in sequence in the front-back direction, the first support frame is connected between the three-roller calender and the second support frame, and is located above the unwinder on the rear side of the three-roller calender, and another part of the cooling rollers are rotatably installed on the first support frame.

[0015] In the above technical solution, further preferably, the extrusion unit further comprises a first guide mechanism located on the front side of the three-roller calender and a second guide mechanism located on the rear side of the three-roller calender, the first guide mechanism comprises a plurality of first transition rollers, the plurality of first transition rollers are arranged in sequence from front to back between the unwinder on the front side of the three-roller calender and the three-roller calender; the second guide mechanism comprises a plurality of second transition rollers, the plurality of second transition rollers are arranged in sequence from front to back between the three-roller calender and the unwinder on the rear side of the three-roller calender.

[0016] In the above technical solution, further preferably, a roller temperature control machine is further included, and the roller temperature control machine is in communication with the upper roller, the middle roller and the lower roller respectively.

[0017] In the above technical solution, further preferably, a slitting device is arranged on the cooling bracket, the slitting device comprises at least one pair of slitting knives, the at least one pair of slitting knives are arranged in sequence in the left-right direction, and each of the slitting knives is configured to be movable in the left-right direction.

[0018] The present application has the following advantages compared with the prior art:

[0019] The multi-layer co-extrusion composite sheet production line of the present application has simple structure, low cost, small floor area, and can cover 1-5 layers of composite products in single production, and the production switching of different products is fast and flexible, which can ensure the uniformity of the multi-layer composite sheet, and the combination between layers is stronger, effectively improving the peeling strength and tensile strength. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Figure 1 is a front view of a multi-layer co-extrusion composite sheet production line according to an embodiment of the present application;

[0021] Figure 2 Figure 2 is a top view of the multi-layer co-extrusion composite sheet production line in Figure 1; Figure 1

[0022] Figure 3 is a position schematic view of an extrusion unit, a unwinding unit and a three-roller calender in Figure 1; Figure 3 Figure 1 Figure 4 is a structure schematic view of the three-roller calender in Figure 3;

[0023] Figure 4 Figure 3 Figure 5 is a front view of a cooling and shaping unit in Figure 1;

[0024] Figure 5 Figure 6 is a top view of the cooling and shaping unit in Figure 5. Figure 1

[0025] Figure 6 Figure 5

[0026] 10, extrusion unit; 1, first extruder; 2, second extruder; 3, third extruder; 4, first extrusion die; 5, second extrusion die; 14, first moving mechanism; 16, first guide mechanism; 161, first transition roller; 17, second guide mechanism; 171, second transition roller; 20, unwinding unit; 6, first unwinder; 7, second unwinder; 30, three-roller calender; 11, upper roller; 12, middle roller; 13, lower roller; 15, second moving mechanism; 40, cooling and shaping unit; 8, cooling bracket; 81, cooling roller; 82, first support frame; 83, second support frame; 9, traction machine; 18, slitting device; 181, slitting knife; 50, winding machine; 60, roller temperature control machine. DETAILED DESCRIPTION

[0027] ​​​​​To illustrate the technical content, structural features, achieved objectives, and effects of the application in detail, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, structure, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0028] This application provides a multi-layer co-extrusion composite sheet production line, which can produce single-layer sheets as well as double-layer, triple-layer, quadruple-layer, and five-layer composite sheets. It is a multi-purpose machine with a wide range of products, effectively reducing production costs and improving production efficiency.

[0029] like Figure 1 , 2 As shown, the production line includes an extrusion unit 10, an unwinding unit 20, a three-roll calender 30, a cooling and shaping unit 40, and a winding machine 50. The extrusion unit 10 is used to extrude sheets into the three-roll calender 30, the unwinding unit 20 is used to release sheets into the three-roll calender 30, the three-roll calender 30 is used to combine the sheets extruded by the extrusion unit 10 and the sheets released by the unwinding unit 20 into a multi-layer composite sheet, the cooling and shaping unit 40 is arranged downstream of the three-roll calender 30 and is used to cool and shape the multi-layer composite sheet, and the winding machine 50 is used to wind up the shaped multi-layer composite sheet.

[0030] The extrusion unit 10 includes a first extruder 1, a second extruder 2, a third extruder 3, and a first extrusion die 4 and a second extrusion die 5 arranged opposite each other. The first extruder 1 and the second extruder 2 are simultaneously connected to the first extrusion die 4. The materials extruded by the first extruder 1 and the second extruder 2 are co-extruded through the first extrusion die 4. The layering ratio and color formula of the co-extruded sheet can be adjusted within the first extrusion die 4, achieving composite layering before exiting the die, ensuring precision and controllability and enhancing composite strength. The third extruder 3 is connected to the second extrusion die 5, and the material extruded by the third extruder 3 is extruded in sheet form through the second extrusion die 5. The first extruder 1, the second extruder 2, and the third extruder 3 can extrude different materials, thus meeting the production needs of different composite sheets. The three extruders are configured with two extrusion dies, reducing the number of dies and effectively lowering the production cost and floor space of the production line. Each extruder is connected to its corresponding extrusion die with a metering pump and a screen changer. The metering pump regulates the flow rate of material from the corresponding extruder to the extrusion die, and the screen changer filters impurities from the conveyed material.

[0031] The unwinding unit 20 includes a first unwinder 6 and a second unwinder 7. Each unwinder has two unwinding stations, and each unwinder is configured to alternate between the two unwinding stations, thereby achieving roll changing without stopping the machine and improving production efficiency. In the embodiments of this application, the first unwinder 6 and the second unwinder 7 are used to unwind materials such as non-woven fabrics and fiberglass meshes, and to combine them with the materials extruded by the extruder according to production requirements to form multi-layer composite sheets, which can enhance the strength of the multi-layer composite sheets. The first unwinder 6 and the second unwinder 7 can unwind sheets of different materials to meet the production needs of different composite sheets.

[0032] like Figure 1 , 3 As shown in Figure 4, the three-roll calender 30 is arranged between the first extrusion die 4 and the second extrusion die 5. The three-roll calender 30 includes an upper roll 11, a middle roll 12, and a lower roll 13 arranged sequentially from top to bottom. The extrusion port of the first extrusion die 4 is aligned with the gap between the upper roll 11 and the middle roll 12 from the front side of the three-roll calender 30, and the extrusion port of the second extrusion die 5 is aligned with the gap between the middle roll 12 and the lower roll 13 from the rear side of the three-roll calender 30. The upper roll 11 and the lower roll 13 can be movably arranged on the upper and lower sides of the middle roll 12 in the vertical direction, which allows adjustment of the gap between the upper roll 11 and the middle roll 12, as well as the gap between the middle roll 12 and the lower roll 13, thereby meeting the production requirements of sheets of different thicknesses.

[0033] like Figure 1 , 5As shown in Figure 6, the cooling and shaping unit 40 includes a cooling bracket 8 and a traction machine 9 arranged at the rear end of the cooling bracket 8. The cooling bracket 8 includes a plurality of cooling rollers 81, a first support frame 82 and a second support frame 83. The second support frame 83 extends in the front-rear direction. Some of the cooling rollers 81 are spaced apart on the second support frame 83 in the front-rear direction and are rotatably mounted on the second support frame 83 about their own axis. The upper surfaces of the plurality of cooling rollers 81 on the second support frame 83 form a conveying plane flush with the traction channel of the traction machine 9 to facilitate the flat rearward conveying of the sheet. The first support frame 82 is connected between the three-roll calender 30 and the second support frame 83, and the front end of the first support frame 82 is detachably connected to the top of the three-roll calender 30. The other part of the cooling rollers 81 are rotatably mounted on the first support frame 82. The distance between the first support frame 82 and the second support frame 83 in the front-to-back direction is long enough to allow the sheet output from the three-roll calender 30 to be fully cooled and shaped. After natural cooling by the long-distance cooling support 8, the sheet exhibits minimal deformation, natural stress release, and a smooth, aesthetically pleasing finish. Due to the considerable height of the three-roll calender 30, the first support frame 82, connected to the three-roll calender 30, is located above the second support frame 83. The space below the first support frame 82 can accommodate at least one unwinding machine, thus saving floor space on the production line. The traction machine 9 provides traction for the front-to-back movement of the multi-layer composite sheet and ensures that the multi-layer composite sheet is smoothly conveyed to the winding machine 50.

[0034] A longitudinal cutting device 18 is provided on the second support frame 83 of the cooling tray 8. The longitudinal cutting device 18 includes at least one pair of longitudinal cutting blades 181, which are arranged sequentially in the left-right direction, and each longitudinal cutting blade 181 is configured to move in the left-right direction. The longitudinal cutting device 18 is used to cut the edges of the multi-layer composite sheet on the cooling tray 8, cutting off the uneven sides of the multi-layer composite sheet, so that the sides of the multi-layer composite sheet are smoothly wound and wound by the winding machine 50. The longitudinal cutting device 18 can also adjust the position of the longitudinal cutting blades 181 in the left-right direction according to production needs to cut sheets with a width that meets production requirements. It has a simple structure and is easy to operate.

[0035] In this embodiment, the first unwinding machine 6 and the second unwinding machine 7 are respectively arranged on the front and rear sides of the three-roll calender 30. The first unwinding machine 6 and the second unwinding machine 7 convey the sheet to the three-roll calender 30 from the front and rear sides respectively. In order to reduce the floor space of the production line, the second unwinding machine 7 is arranged below the first support frame 82.

[0036] like Figure 4 , 5As shown, the extrusion unit 10 also includes a first guide mechanism 16 located in front of the three-roll calender 30 and a second guide mechanism 17 located behind the three-roll calender 30. The first guide mechanism 16 includes a plurality of first transition rollers 161, which are arranged sequentially from front to back between the first unwinder 6 and the three-roll calender 30 to guide the sheet released by the first unwinder 6 to be flatly conveyed from front to back onto the three-roll calender 30. The second guiding mechanism 17 includes several second transition rollers 171, which are arranged sequentially from front to back between the three-roll calender 30 and the second unwinder 7. These rollers guide the sheet released from the second unwinder 7 to be smoothly conveyed from back to front onto the three-roll calender 30. Some of the second transition rollers 171 are rotatably mounted on the first support frame 82 and located below the cooling rollers 81 on the first support frame 82. On the first support frame 82, the movement path of the multi-layer composite sheet output from the three-roll calender 30 is above the movement path of the sheet released from the second unwinder 7, thus avoiding mutual interference and improving conveying efficiency. These two guiding mechanisms ensure smooth sheet conveying, improving the flatness and finished product quality of the final multi-layer composite sheet.

[0037] The winding machine 50 is used to wind multi-layer composite sheets under constant tension.

[0038] like Figure 1 , 2 As shown in Figures 1 and 4, the first extruder 1, the second extruder 2, and the third extruder 3 are arranged sequentially from front to back, and are all arranged on the same side of the three-roll calender 30.

[0039] The bottom of the third extruder 3 and the second extrusion die 5 is provided with a first moving mechanism 14, which allows the third extruder 3 and the second extrusion die 5 to move in the front-to-back direction. The bottom of the three-roll calender 30 is provided with a second moving mechanism 15, which allows the three-roll calender 30 to move in the front-to-back direction. When the three-roll calender 30 needs to change rolls, or when the extruder or extrusion die needs to be cleaned or maintained, the first moving mechanism 14 allows the third extruder 3 and the second extrusion die 5 to move backward away from the three-roll calender 30. After the second extrusion die 5 moves backward, the three-roll calender 30 can move backward by the second moving mechanism 15 to move away from the first extrusion die 4, facilitating operations such as roll changing, cleaning, and maintenance.

[0040] A roller temperature controller 60 is located on the other side of the three-roll calender 30. The roller temperature controller 60 is arranged on a different side from the first extruder 1, second extruder 2, and third extruder 3, ensuring they do not interfere with each other's operation and reducing the floor space required for the production line. In this embodiment, the first extruder 1, second extruder 2, and third extruder 3 are located on the left side of the three-roll calender 30, while the roller temperature controller 60 is located on the right side. The roller temperature controller 60 is connected to the upper roller 11, middle roller 12, and lower roller 13, and precisely controls the roller surface temperature of each roller by continuously supplying cooling water to each roller, thereby improving the production efficiency of the three-roll calender 30. The three-roll calender 30 presses the material extruded from the extruder and the sheet released from the unwinding machine together between the rollers. The roller temperature controller 60 ensures precise temperature control of each roller, allowing adjacent layers to bond at high temperatures, resulting in tighter interfacial molecular chain entanglement, improved peel strength and tensile strength, and uniform sheet thickness.

[0041] In the production of five-layer composite sheets, the single-layer sheets released from the second unwinder 7, the single-layer sheets extruded from the second extrusion die 5, and the single-layer sheets released from the first unwinder 6 are sequentially stacked from top to bottom and fed between the middle roller 12 and the lower roller 13. The middle roller 12 and the lower roller 13 press them together to form a three-layer composite sheet. This three-layer composite sheet is then wound between the upper roller 11 and the middle roller 12, where it is pressed together with the double-layer co-extruded sheet extruded from the first extrusion die 4 to form a five-layer composite sheet. When using the production line of this application, the first extruder 1, the second extruder 2, the third extruder 3, the first unwinder 6, and the second unwinder 7 can be selectively controlled. A single production run can cover composite products with 1-5 layers, and the switching between different products is quick and flexible.

[0042] The multi-layer co-extruded composite sheet production line of this application has a simple structure, low cost, and small footprint. It can produce composite products with 1-5 layers in a single batch, and the production switching between different products is fast and flexible. It can ensure the uniformity of the multi-layer composite sheet, and the bonding between each layer is stronger, effectively improving the peel strength and tensile strength.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made without departing from the spirit and scope of this application. The scope of protection claimed by this application is defined by the appended claims, specification, and their equivalents.

Claims

1. A multilayer coextruded composite sheet production line characterized by, The application relates to a production line for producing a film, comprising: an extruding unit, comprising a first extruder, a second extruder, a third extruder, and a first extruding die and a second extruding die arranged oppositely in front and back, the first extruder and the second extruder being in communication with the first extruding die at the same time, and the third extruder being in communication with the second extruding die; a winding-off unit, comprising two winding-off machines, each of which has two winding-off stations, and each of the winding-off machines is configured to alternately wind off the two winding-off stations; a three-roller calender arranged between the first extruding die and the second extruding die, the three-roller calender comprising an upper roller, a middle roller and a lower roller arranged in sequence from top to bottom, the extruding outlet of the first extruding die being aligned with the gap between the upper roller and the middle roller from the front side of the three-roller calender, and the extruding outlet of the second extruding die being aligned with the gap between the middle roller and the lower roller from the back side of the three-roller calender; a cooling and shaping unit located downstream of the three-roller calender, the cooling and shaping unit comprising a cooling bracket and a traction machine arranged at the back end of the cooling bracket, the front end of the cooling bracket being detachably connected to the top of the three-roller calender, and at least part of the cooling bracket having a space below for placing one of the winding-off machines; and a winding machine arranged downstream of the cooling and shaping unit.

2. The multilayer co-extrusion composite sheet production line according to claim 1, characterized in that, The first extruder, the second extruder and the third extruder are arranged in sequence from front to back, and are arranged on the left side or the right side of the three-roller calender.

3. The multilayer co-extrusion sheet line according to claim 2, characterized in that, The third extruder and the bottom of the second extruding die are provided with a first moving mechanism, and the third extruder and the second extruding die are configured to be movable in the front-back direction through the first moving mechanism.

4. The multi-layer co-extrusion composite sheet production line according to claim 2, characterized in that, The bottom of the three-roller calender is provided with a second moving mechanism, and the three-roller calender is configured to be movable in the front-back direction through the second moving mechanism.

5. The multilayer co-extrusion sheet line according to claim 1, characterized in that, The two winding-off machines are arranged on the front side and the back side of the three-roller calender respectively.

6. The multilayer co-extrusion sheet line according to claim 5, characterized in that, The cooling bracket comprises a first support frame, a second support frame and a plurality of cooling rollers, the second support frame is located on the back side of the first support frame and extends in the front-back direction, a part of the cooling rollers are rotatably installed in sequence on the second support frame in the front-back direction, the first support frame is connected between the three-roller calender and the second support frame and is located above the winding-off machine on the back side of the three-roller calender, and the other part of the cooling rollers are rotatably installed on the first support frame.

7. The multi-layer co-extrusion sheet line according to claim 5, characterized in that, The extrusion unit further comprises a first guide mechanism located at the front side of the three-roller calender and a second guide mechanism located at the rear side of the three-roller calender, the first guide mechanism comprises a plurality of first transition rollers, the plurality of first transition rollers are sequentially arranged from front to back between the unwinder at the front side of the three-roller calender and the three-roller calender; the second guide mechanism comprises a plurality of second transition rollers, the plurality of second transition rollers are sequentially arranged from front to back between the three-roller calender and the unwinder at the rear side of the three-roller calender.

8. The multilayer co-extrusion sheet line according to claim 1, characterized in that, Further comprising a roller temperature control machine, the roller temperature control machine is in communication with the upper roller, the middle roller and the lower roller respectively.

9. The multilayer co-extrusion sheet line according to claim 1, characterized in that, The cooling bracket is provided with a slitting device, the slitting device comprises at least one pair of slitting knives, the at least one pair of slitting knives are sequentially arranged along the left-right direction, and each slitting knife is configured to be movable along the left-right direction.

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