Plastic sheet manufacturing equipment

Abstract

The utility model discloses plastic sheet manufacturing equipment, and relates to the field of plastic processing, and the plastic sheet manufacturing equipment comprises a co-extrusion assembly, a first coating assembly, a multi-layer drying assembly and a winding assembly which are sequentially arranged along a preset transmission path. The co-extrusion assembly comprises an extrusion device, a die head device and a press polish device, the die head device is connected with the extrusion device, and the press polish device is used for extruding the extruded molten raw materials into continuous sheets; the first coating assembly comprises a first coating roller, and the first coating roller is adhered with coating and is used for coating one side of the sheet with the coating roller; the multi-layer drying assembly comprises a drying box and drying parts sequentially arranged in the drying box in the vertical direction, and the drying parts are used for drying the sheets with the coating. The arrangement of the first coating assembly and the drying assembly further allows additional functional layers to be applied to one face or two faces of the sheet, the integrated design of the equipment is more flexible, the purchase and vacancy cost of the equipment can be reduced, and the equipment is particularly suitable for small-batch and multi-category production.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of plastic processing, in particular to a plastic sheet manufacturing equipment. BACKGROUND

[0002] As the main forming method of plastic products such as packaging boxes and preservation boxes, the vacuum forming process is widely used in the fields of food, daily chemicals, medicine and daily necessities. The vacuum forming sheet is the key raw material of such products, and its apparent quality, physical properties and functionality directly affect the aesthetic, service life and safety of the final product. With the increasing demand for packaging appearance and functionality in the market, single-layer plastic sheets have been unable to meet the diversified performance requirements, and thus multi-layer composite sheets have gradually evolved, such as through the superposition of specific functional layers (such as black and white layers, moisture-proof layers, anti-static layers or hydrophobic layers, etc.) to achieve different purposes. However, the manufacturing process of multi-layer plastic sheets often faces problems such as complex structure, high cost and difficulty in equipment modification.

[0003] The manufacturing of multi-layer sheets in the past generally adopts multi-layer co-extrusion, that is, each layer of raw material is independently heated, mixed and extruded into a molten state, and then the molten raw materials of each layer are compounded and calendered into a sheet according to the preset order. However, this manufacturing process has the following defects: when the plastic sheet needs to increase the number of layers or change the functional material, additional extruders, production lines, and supporting multi-channel distributors and die heads need to be added, which limits the scalability of hardware costs and production line layout; to meet different batch or customized needs, only a small amount of functional raw materials are replaced or added on the basis of the original, which often requires restarting a complete extrusion line or even replacing the die head, resulting in a significant increase in energy consumption and operating costs, which is very disadvantageous for small batch and flexible production.

[0004] Based on the above reasons, how to optimize the manufacturing equipment of multi-layer sheets, reduce the frequency of production line configuration and die head replacement, and operating energy consumption, and improve the rapid switching capability of multi-type and multi-layer sheets has gradually become an urgent problem to be solved in the related field. CONTENT OF THE INVENTION

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a plastic sheet manufacturing equipment, which has higher flexibility for multi-layer sheet manufacturing requirements and can reduce production and operating costs.

[0006] According to the plastic sheet manufacturing device, the multi-layer co-extrusion mode of the co-extrusion assembly can realize the combination of base materials under the same die structure, the first coating assembly and the drying assembly are further arranged to allow additional functional layers (such as matte, bright, hydrophobic, barrier layer, etc.) to be applied on one side or both sides of the sheet, so as to meet different functional and appearance requirements. Compared with the traditional mode of increasing an extruder and replacing a multi-channel die every time a new layer is added, the integrated design of the device is more flexible. When the coating needs to be replaced or the sheet needs to be treated with a special surface, only the coating roller or the drying temperature and other parameters need to be adjusted accordingly, so that the device can be quickly switched to a new sheet production mode without the need to make large-scale changes or add new extrusion lines, and the die does not need to be replaced, which greatly reduces the purchase and idle costs of expensive equipment, and is especially suitable for small-batch and multi-category production.

[0007] According to the plastic sheet manufacturing device, the multi-layer co-extrusion mode of the co-extrusion assembly can realize the combination of base materials under the same die structure, the first coating assembly and the drying assembly are further arranged to allow additional functional layers (such as matte, bright, hydrophobic, barrier layer, etc.) to be applied on one side or both sides of the sheet, so as to meet different functional and appearance requirements. Compared with the traditional mode of increasing an extruder and replacing a multi-channel die every time a new layer is added, the integrated design of the device is more flexible. When the coating needs to be replaced or the sheet needs to be treated with a special surface, only the coating roller or the drying temperature and other parameters need to be adjusted accordingly, so that the device can be quickly switched to a new sheet production mode without the need to make large-scale changes or add new extrusion lines, and the die does not need to be replaced, which greatly reduces the purchase and idle costs of expensive equipment, and is especially suitable for small-batch and multi-category production.

[0008] According to some embodiments of the present application, the first coating assembly further comprises a first adjusting roller, a first vertical adjustable roller stand, and a first coating disc, the first adjusting roller is arranged at the adjustable end of the first vertical adjustable roller stand, the first coating roller is arranged below the first adjusting roller, the coating disc is arranged below the first coating roller, the first coating roller is in contact with the coating in the first coating disc, and the first coating roller and the first adjusting roller are arranged for the sheet to pass through.

[0009] According to some embodiments of the present application, the drying box is provided with a plurality of pairs of openings, two pairs of the openings are respectively arranged at the same horizontal height on the opposite sides of the drying box, the drying part is located between the two pairs of openings, the sheet material enters the drying part from one of the openings of a pair of the openings and then passes out from the other opening, the drying box is provided with a first support roller and a second support roller at the position of the openings, the sheet material passes between the first support roller and the second support roller.

[0010] According to some embodiments of the present application, the transmission path sequentially passes through the co-extrusion assembly, the first coating assembly, the multi-layer drying assembly, the second coating assembly, and then re-passes through the multi-layer drying assembly, and finally is wound by the winding assembly, the second coating assembly comprises a second coating roller and a plurality of turning rollers, the turning rollers are used to change the transmission direction of the sheet material, and the second coating roller is coated with coating and used to coat the other side of the sheet material.

[0011] According to some embodiments of the present application, the second coating assembly further comprises a second adjusting roller, a second vertical adjustable roller stand, and a second coating disc, the second adjusting roller is arranged at the adjustable end of the second vertical adjustable roller stand, the second coating roller is arranged below the second adjusting roller, the turning rollers are arranged obliquely above the second coating roller and the second adjusting roller, the coating disc is arranged below the second coating roller, the second coating roller is in contact with the coating in the second coating disc, and the second coating roller and the second adjusting roller are used for the sheet material to pass through.

[0012] According to some embodiments of the present application, the drying part is provided with two drying parts, the transmission path sequentially passes through the co-extrusion assembly, the first coating assembly, one of the drying parts, the second coating assembly, and then re-passes through the other drying part, and finally reaches the winding assembly.

[0013] According to some embodiments of the present application, the extrusion device comprises a main machine barrel, an auxiliary machine barrel, a main machine screw, an auxiliary machine screw, a main machine driving mechanism, an auxiliary machine driving mechanism, a main machine heating mechanism, an auxiliary machine heating mechanism, and a multi-layer co-extrusion distributor, the main machine screw is rotatably arranged in the main machine barrel, the auxiliary machine screw is rotatably arranged in the auxiliary machine barrel, the main machine driving mechanism and the auxiliary machine driving mechanism respectively drive the main machine screw and the auxiliary machine screw to rotate, the main machine heating mechanism and the auxiliary machine heating mechanism are respectively arranged around the periphery of the main machine barrel and the auxiliary machine barrel, the inlet of the main machine barrel and the auxiliary machine barrel is provided with a feeding hopper, the outlet end of the main machine barrel and the auxiliary machine barrel is connected to the feeding port of the multi-layer co-extrusion distributor, and the discharging port of the multi-layer co-extrusion distributor is connected to the feeding port of the die device.

[0014] According to some embodiments of the present application, the calendering device comprises a first horizontal adjustable roller stand, two calendering rollers, a cooling roller and a calendering driving element, the two calendering rollers are arranged at the adjustable end of the first horizontal adjustable roller stand, and the two calendering rollers are arranged at the same horizontal height, the first horizontal adjustable roller stand is used to adjust the size of the gap between the two calendering rollers, the discharge port of the die head device is located directly below the gap, and the calendering driving element drives the two calendering rollers to rotate in opposite directions, so that the molten material is extruded into a sheet, and then the sheet is cooled and formed by passing around the cooling roller.

[0015] According to some embodiments of the present application, the cutting edge assembly is arranged after the co-extrusion assembly, the cutting edge assembly comprises a cutting edge support, a cutting edge roller, a circular blade, a cutting edge driving element and a blade adjusting element, the cutting edge roller, the cutting edge driving element and the blade adjusting element are arranged on the cutting edge support, the cutting edge roller is connected with the driving end of the cutting edge driving element, the circular blade is rotatably connected with the blade adjusting element, the circular blade abuts against the cutting edge roller, and the blade adjusting element is used to adjust the height and horizontal position of the circular blade.

[0016] According to some embodiments of the present application, a plurality of material pulling assemblies are arranged after the co-extrusion assembly or the drying assembly, the material pulling assembly comprises a material pulling support, a material pulling driving roller arranged on the material pulling support, a material pulling driven roller and a material pulling driving element, the material pulling driving roller abuts against the material pulling driven roller, the driving end of the material pulling driving element is connected with the material pulling driving roller, and the rotational linear speed of each material pulling driving roller is the same. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0018] Figure 1 The structure schematic diagram of the plastic sheet manufacturing equipment according to the embodiments of the present application is shown in the figure;

[0019] Figure 2 The structure schematic diagram of the extruding device according to the embodiments of the present application is shown in the figure;

[0020] Figure 3 The structure schematic diagram of the calendering device according to the embodiments of the present application is shown in the figure;

[0021] Figure 4 The structure schematic diagram of the first coating assembly according to the embodiments of the present application is shown in the figure;

[0022] Figure 5 The structure schematic diagram of the second coating assembly according to the embodiments of the present application is shown in the figure;

[0023] Figure 6 The structure schematic diagram of the multi-layer drying assembly according to the embodiments of the present application is shown in the figure;

[0024] Figure 7 Structure diagram of the trimming assembly of the embodiment of the present application.

[0025] Reference signs:

[0026] Co-extrusion assembly 100; extrusion device 110; main machine cylinder 111; auxiliary machine cylinder 112; main machine screw 113; auxiliary machine screw 114; main machine driving mechanism 115; auxiliary machine driving mechanism 116; main machine heating mechanism 117; auxiliary machine heating mechanism 118; multi-layer co-extrusion distributor 119; die head device 120; calender device 130; first horizontal adjustable roller stand 131; calender roller 132; cooling roller 133; calender driving part 134; first coating assembly 200; first coating roller 210; first adjusting roller 220; first vertical adjustable roller stand 230; first coating disc 240; multi-layer drying assembly 300; drying box 310; drying part 320; opening 330; first supporting roller 340; second supporting roller 350; second coating assembly 400; second coating roller 410; second adjusting roller 420; second vertical adjustable roller stand 430; second coating disc 440; turning roller 450; trimming assembly 500; trimming support 510; trimming roller 520; circular blade 530; trimming driving part 540; blade adjusting part 550; material pulling assembly 600; winding assembly 700. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation to the present application.

[0028] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as a limitation to the present application, which indicates or implies that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0029] In the description of the present application, if the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0030] In the description of the present application, the words such as arrangement, installation, connection, etc. should be understood broadly unless otherwise explicitly limited, and the skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0031] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] As shown in Figure 1 , the embodiment plastic sheet manufacturing equipment is sequentially arranged along a preset conveying path with a co-extrusion assembly 100, a first coating assembly 200, a multi-layer drying assembly 300 and a winding assembly 700. As shown in Figure 2 and Figure 3 , the co-extrusion assembly 100 includes an extrusion device 110, a die device 120 and a calender device 130. The extrusion device 110 is usually composed of a main extruder and an auxiliary extruder or multiple extruders (the specific arrangement of several extruders can be determined by actual production needs, for example, if the company's business mainly produces plastic sheets with 2 layers or less as the base material, two extruders can be arranged), which is used to heat and plasticize the raw materials of different formulations respectively and continuously extrude under the action of screw rotation. The output ends of multiple extruders are respectively connected to the feed ports of a multi-layer co-extrusion distributor 119, preferably, a driving mechanism and a heating mechanism are arranged on the periphery of each extruder barrel to ensure independent control of the melting temperature and extrusion speed of the material. The discharge port of the multi-layer co-extrusion distributor 119 is connected to the feed port of the die device 120, and the die device 120 extrudes multiple molten streams from the slit die according to a preset order. The calender device 130 is arranged directly below the die discharge port and is typically composed of two or more calender rollers 132, the gap between the calender rollers 132 is adjustable, which is used to control the thickness and surface flatness of the sheet. The extruded molten material is quickly formed into a continuous sheet under the rotary extrusion of the calender rollers 132, and the sheet temperature is further reduced and the size is stabilized by the cooling roller 133.

[0033] After the sheet is formed, it enters the first coating assembly 200 for coating treatment. As shown in Figure 4As shown, the first coating assembly 200 includes a first coating roller 210, a first adjusting roller 220, a first vertical adjustable roller stand 230 and a first coating tray 240. The first coating roller 210 is partially immersed in or in contact with the coating tray containing the coating material, and the coating material is uniformly adhered to the roller surface and transferred to the surface of the sheet material through the contact between the roller surface and the coating material. The first adjusting roller 220 is arranged above the first adjusting roller 220, and the sheet material passes through the gap between the first coating roller 210 and the first adjusting roller 220. The first adjusting roller 220 presses the sheet material downward, so that the sheet material is in contact with the first coating roller 210. At the same time, the height of the first adjusting roller 220 is adjustable, that is, the force of the first adjusting roller 220 pressing the sheet material can be adjusted, so as to adjust the contact gap between the sheet material and the first coating roller 210, and further adjust the coating thickness of the coating material in the sheet material. Alternatively, the first coating roller 210 can also be driven by a separate speed-adjusting driving device, so that the rotational linear speed of the first coating roller 210 and the moving speed of the sheet material form a speed difference, so as to accurately control the coating thickness and uniformity. It can be understood that if coating is needed on the other side of the sheet material, double-sided coating can be realized by turning over the sheet material to meet the diversified functional or decorative requirements.

[0034] Subsequently, the coated sheet material is conveyed to the multi-layer drying assembly 300 to complete the curing or solvent evaporation of the coating. The multi-layer drying assembly 300 is usually composed of a drying box 310 and a plurality of drying parts 320 inside. The drying parts 320 can be arranged in the vertical direction. It can be understood that each drying part 320 is provided with a heating source (such as an electric heating tube, a hot air circulation device or an infrared heating module) inside. The sheet material is gradually dried during the conveying process in the drying part 320.

[0035] The sheet material after drying is finally wound by the winding assembly 700. The winding assembly 700 includes a plurality of winding rollers and tension adjusting devices matched therewith. By adjusting the rotational speed or tension of each winding roller, the sheet material can be stably and uniformly wound into a roll, which is beneficial for subsequent storage or transportation.

[0036] As Figure 6As shown, the opposite two sides of the drying box 310 are provided with a plurality of pairs of openings 330, each pair of openings 330 is arranged at the same horizontal height, and a drying part 320 is arranged between each pair of openings 330. The drying box 310 is further provided with a first supporting roller 340 and a second supporting roller 350 at the position of each opening 330. In the design of the transmission path, the sheet material enters the layer drying part 320 through one of the openings 330 in one pair of openings 330, and after being subjected to drying treatment, it leaves from the other opening 330 in the same pair of openings 330. In order to support and guide the sheet material passing through the drying box 310, the drying box 310 is provided with a first supporting roller 340 and a second supporting roller 350 at the opening 330, and a sufficient passage space is reserved between the two to allow the sheet material to pass through. The first supporting roller 340 and the second supporting roller 350 can adopt a fixed shaft type or a rotatable structure to reduce the sliding friction of the sheet material. Understandably, the drying box 310 can be controlled segmentally between the layers of drying parts 320, such as by providing independent temperature detection devices and circulating fans inside the drying box 310, so as to flexibly and accurately adjust the temperature and air speed of each drying part 320 according to the requirements of different coatings or coating thicknesses. If multiple back-and-forth drying or different temperature zones are required, the sheet material is sequentially inserted between multiple pairs of openings 330, and a longer drying distance is achieved by controlling the circuitous route of the sheet material.

[0037] In some embodiments, a second coating assembly 400 is additionally provided, and the transmission path is designed in sequence as "co-extrusion assembly 100→ first coating assembly 200→ multi-layer drying assembly 300→ second coating assembly 400→ multi-layer drying assembly 300→ winding assembly 700". The sheet material is coated on one side of the sheet material by the first coating assembly 200, and after preliminary drying by the multi-layer drying assembly 300, it is coated on the other side of the sheet material by the second coating assembly 400, and after circuitous entry into the multi-layer drying assembly 300, the segmented coating and drying of both sides of the sheet material are successfully achieved.

[0038] For example, Figure 5As shown, the first coating assembly 200 is similar in structure to the first coating assembly 200, and the second coating assembly 400 is mainly composed of a second coating roller 410, a plurality of deflection rollers 450, a second adjusting roller 420, a second vertical adjustable roller stand 430, and a second coating tray 440, and cooperates with the multi-layer drying assembly 300 in the sheet conveying path. The coating adhered to the second coating roller 410 of the first coating assembly 200 is directly coated on the uncoated surface of the sheet as the roller surface rotates. The second coating roller 410 can be precisely controlled to adhere to the sheet by the second vertical adjustable roller stand 430, thereby controlling the thickness of the coating. A plurality of deflection rollers 450 are arranged obliquely above or near the second coating roller 410 and the second adjusting roller 420, which mainly change the conveying direction of the sheet, so that the originally parallel advancing sheet can be moderately turned over (such as turning the conveying path of the sheet by 180 degrees), ensuring that the second coating roller 410 adheres to the other side of the sheet. After the second coating assembly 400 completes coating on the other side of the sheet, the sheet will re-enter the multi-layer drying assembly 300 for secondary or deeper drying.

[0039] It can be understood that in actual application, a plurality of first coating assemblies 200 and second coating assemblies 400 can be set according to the process requirements of the finished plastic sheet. The sheet is shuttled back and forth between the first coating assembly 200, the second coating assembly 400, and the multi-layer drying assembly 300, realizing coating, drying, re-coating, and re-drying, and repeating the process to complete multi-layer coating of the sheet. Taking the example that the multi-layer drying assembly 300 is provided with two drying sections 320, the first coating assembly 200 is provided with one, and the second coating assembly 400 is provided with one, after the raw material is melted and extruded into a sheet by the co-extrusion assembly 100, the sheet first passes through the first coating assembly 200 to coat one side, then the sheet enters one of the drying sections 320 of the multi-layer drying assembly 300 for drying, after the sheet passes out of the drying section 320, the other side of the sheet is coated by the second coating assembly 400, then the sheet re-enters the other drying section 320 of the multi-layer drying assembly 300, and after drying, enters the winding assembly 700.

[0040] In some embodiments, as Figure 2As shown, the extrusion device 110 of the co-extrusion assembly 100 includes a main machine cylinder 111, an auxiliary machine cylinder 112, a main machine screw 113, an auxiliary machine screw 114, a main machine driving mechanism 115, an auxiliary machine driving mechanism 116, a main machine heating mechanism 117, an auxiliary machine heating mechanism 118, and a multi-layer co-extrusion distributor 119. Among them, the main machine cylinder 111 and the auxiliary machine cylinder 112 are respectively used for heating and plasticizing different formula materials, and the main machine screw 113 and the auxiliary machine screw 114 can be respectively arranged inside the main machine cylinder 111 and the auxiliary machine cylinder 112, and the screw is driven to rotate by the driving mechanism, so that the material is continuously conveyed and melt-mixed. The main machine cylinder 111 and the auxiliary machine cylinder 112 are respectively provided with the main machine heating mechanism 117 and the auxiliary machine heating mechanism 118 on the outer wall, which ensures that the material gradually warms up and fully plasticizes from the feeding end to the discharging end. The main machine screw 113 and the auxiliary machine screw 114 are respectively connected with the main machine driving mechanism 115 and the auxiliary machine driving mechanism 116, and can adopt a servo motor, a variable frequency motor or other power device to provide torque and rotating speed. With the help of programmable logic controller (PLC) or distributed control system (DCS), the rotating speed of the motor is accurately adjusted to adapt to the different material flow and viscosity requirements. The outlet ends of the main machine cylinder 111 and the auxiliary machine cylinder 112 are connected to the feeding port of the multi-layer co-extrusion distributor 119, which is used to combine the multiple materials after independent extrusion and plasticization to the same internal flow channel. The multi-layer co-extrusion distributor 119 usually designs the flow channel according to the number of sheet layers, the flow distribution ratio and the material viscosity difference, effectively controls the flow sequence and distribution position of different materials in the flow channel, and avoids the dispersion or uneven thickness caused by interface disorder. Finally, the discharging port of the multi-layer co-extrusion distributor 119 is connected to the feeding port of the die device 120 through a flange or a flange fitting, so that the multiple melt flows are further uniformly compounded in the die and extruded to the calender device 130.

[0041] In some embodiments, as Figure 3As shown, the calendering device 130 of the co-extrusion assembly 100 includes a first horizontal adjustable roller 131 frame, two calendering rollers 132, a cooling roller 133, and a calendering drive 134, and is arranged below the die head assembly 120. By precisely adjusting the gap and rotational speed between the two calendering rollers 132, the extruded molten material can be roll-formed. The two calendering rollers 132 are arranged at the same horizontal height and close to each other. Their relative positions can be changed by the fine-tuning mechanism of the first horizontal adjustable roller 131 frame to meet the extrusion requirements of different sheet thicknesses. The calendering drive 134 is connected to one of the roller shafts of the two calendering rollers 132, driving the calendering roller 132 to rotate at a predetermined speed and direction. The other calendering roller 132 rotates in the opposite direction or is linked by gear / belt drive to extrude and stretch the molten material falling from the outlet of the die head assembly 120 into a continuous sheet. When the molten material extruded by the die head device 120 flows through the gap between the calendering rollers 132, it is compressed into a sheet of a preset thickness. Due to the symmetrical arrangement of the two rollers and the precise adjustable gap, the formed sheet can achieve good control in terms of thickness uniformity and surface flatness. To ensure timely cooling and shaping of the formed sheet, the sheet bypasses the cooling roller 133 and comes into contact with the surface of the cooling roller. Cooling water or other cooling media circulates inside the cooling roller, carrying away the heat that has not yet dissipated from the sheet. This process can maintain the physical dimensional stability of the sheet and minimize shrinkage and deformation during subsequent transport or coating processes.

[0042] In some embodiments, a trimming assembly 500 is also provided for trimming the edges of the sheet material, thereby ensuring the neatness of the finished sheet material edges and dimensional accuracy. Figure 7 As shown, the trimming assembly 500 includes core components such as a trimming bracket 510, a trimming roller 520, a circular blade 530, a trimming drive 540, and a blade adjustment component 550. The trimming assembly 500 is generally located after the co-extrusion assembly 100, allowing the sheet to immediately enter the trimming process after initial forming and cooling, preventing protrusions or defects on the two edges of the sheet from damaging subsequent equipment on the production line (such as the first coating roller 210 or the second coating roller 410). The trimming roller 520 is connected to the output shaft of the trimming drive 540, which can be driven by a variable frequency motor or a servo motor to ensure stable speed and controllable torque. The contact between the trimming roller 520 and the circular blade 530 should be slightly pressed so that the blade can effectively remove excess edge material. The circular blade 530 is supported on the cutting bracket 510 by the blade adjustment member 550. For example, the vertical adjustment of the blade adjustment member 550 can be achieved by a cylinder, and the horizontal position adjustment of the blade adjustment member 550 can be achieved by a screw or an eccentric mechanism. When the blade needs to be raised (such as when the blade needs to be replaced), the cylinder drives the blade to rise; when the width of the sheet changes, the screw or eccentric mechanism is turned to make the blade move horizontally.

[0043] In some embodiments, a pulling assembly 600 is also provided, which is generally composed of a pulling bracket, a pulling drive roller, a pulling driven roller, a pulling drive member, and the like, and is used to provide constant and controllable pulling force and transmission speed during the transmission of the sheet material, so as to ensure the stability of the sheet material tension and improve the overall production efficiency. The pulling bracket is fixed at a suitable position on the production line, and can be arranged after the extruder or after the drying box 310, etc. It can also be flexibly arranged according to the tension requirements of different process sections. The pulling driven roller is arranged opposite to the pulling drive roller, and can be pressed by a pressing mechanism (such as a pneumatic cylinder or a spring), so that the sheet material can stably and reciprocally travel under the clamping of the two rollers. When the sheet material passes through the pulling assembly 600, the linear speed of the drive roller determines the transmission speed of the sheet material. If multiple pulling assemblies 600 are linked, they are synchronously and uniformly controlled, so that the linear speed of each pulling drive roller is the same.

[0044] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present application. In addition, the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

Claims

1. A plastic sheet manufacturing apparatus characterized by comprising: 1) a plastic sheet manufacturing device, The application relates to a multi-layer film processing device. The device comprises a co-extrusion assembly, a first coating assembly, a multi-layer drying assembly and a winding assembly arranged along a preset transmission path in sequence. The co-extrusion assembly comprises an extrusion device, a die head device and a calender device, the die head device is connected with the extrusion device, the extrusion device is used for melting raw materials and extruding the raw materials through the die head device, and the calender device is arranged directly below a discharging port of the die head device and is used for extruding the extruded molten raw materials into a continuous sheet. The first coating assembly comprises a first coating roller, the first coating roller is in contact with the sheet, and the first coating roller is coated with coating and is used for coating the coating roller to one side of the sheet. The multi-layer drying assembly comprises a drying box and a plurality of drying parts arranged in the drying box in sequence in the vertical direction, and the drying parts are used for drying the sheet with coating. The winding assembly comprises a plurality of winding rollers, and the winding rollers rotate to collect the processed sheet into a roll.

2. The plastic sheet manufacturing apparatus according to claim 1, wherein: The first coating assembly further comprises a first adjusting roller, a first vertical adjustable roller stand and a first coating disc, the first adjusting roller is arranged at an adjustable end of the first vertical adjustable roller stand, the first coating roller is arranged below the first adjusting roller, the coating disc is arranged below the first coating roller, the first coating roller is in contact with coating in the first coating disc, and the first coating roller and the first adjusting roller are used for allowing the sheet to pass through.

3. The plastic sheet manufacturing apparatus according to claim 1, characterized by: The drying box is provided with a plurality of pairs of openings, two pairs of the openings are arranged at two opposite sides of the drying box along the same horizontal height, the drying parts are located between the two pairs of openings, the sheet enters the drying part from one of the openings in one pair of the openings and then passes out from the other opening, and the drying box is provided with a first supporting roller and a second supporting roller at the positions of the openings, and the sheet passes between the first supporting roller and the second supporting roller.

4. The plastic sheet manufacturing apparatus according to claim 1, wherein: The device further comprises a second coating assembly, the transmission path sequentially passes through the co-extrusion assembly, the first coating assembly, the multi-layer drying assembly, the second coating assembly, then passes through the multi-layer drying assembly again, and finally is wound by the winding assembly, the second coating assembly comprises a second coating roller and a plurality of turning rollers, the turning rollers are used for changing the transmission direction of the sheet, the second coating roller is coated with coating and is used for coating the coating roller to the other side of the sheet.

5. The apparatus of claim 4, wherein: The second coating assembly further comprises a second adjusting roller, a second vertical adjustable roller stand and a second coating disc, the second adjusting roller is arranged at an adjustable end of the second vertical adjustable roller stand, the second coating roller is arranged below the second adjusting roller, the turning rollers are arranged obliquely above the second coating roller and the second adjusting roller, the coating disc is arranged below the second coating roller, the second coating roller is in contact with coating in the second coating disc, and the second coating roller and the second adjusting roller are used for allowing the sheet to pass through.

6. The plastic sheet manufacturing apparatus according to claim 4, characterized by: The drying parts are provided with two drying parts, the transmission path sequentially passes through the co-extrusion assembly, the first coating assembly, one of the drying parts, the second coating assembly, then passes through the other drying part again, and finally reaches the winding assembly.

7. The plastic sheet manufacturing apparatus according to claim 1, characterized by: The extrusion device comprises a main machine cylinder, an auxiliary machine cylinder, a main machine screw, an auxiliary machine screw, a main machine driving mechanism, an auxiliary machine driving mechanism, a main machine heating mechanism, an auxiliary machine heating mechanism and a multi-layer co-extrusion distributor, the main machine screw is rotatably arranged in the main machine cylinder, the auxiliary machine screw is rotatably arranged in the auxiliary machine cylinder, the main machine driving mechanism and the auxiliary machine driving mechanism drive the main machine screw and the auxiliary machine screw to rotate respectively, the main machine heating mechanism and the auxiliary machine heating mechanism are arranged around the periphery of the main machine cylinder and the auxiliary machine cylinder respectively, the inlet of the main machine cylinder and the auxiliary machine cylinder is provided with a feeding hopper, the outlet of the main machine cylinder and the auxiliary machine cylinder is connected to the feeding port of the multi-layer co-extrusion distributor, and the discharging port of the multi-layer co-extrusion distributor is connected to the feeding port of the die device.

8. The plastic sheet manufacturing apparatus according to claim 1, characterized by: The calender device comprises a first horizontal adjustable roller frame, two calender rollers, a cooling roller and a calender driving member, the two calender rollers are arranged at the adjustable end of the first horizontal adjustable roller frame and are arranged in close proximity at the same horizontal height, the first horizontal adjustable roller frame is used for adjusting the size of the gap between the two calender rollers, the discharging port of the die device is located directly below the gap, and the calender driving member drives the two calender rollers to rotate in opposite directions, so that the molten material is extruded into a sheet by the two calender rollers, and then the sheet is cooled and formed by passing around the cooling roller.

9. The plastic sheet manufacturing apparatus according to any one of claims 1 to 8, characterized by: The edge cutting assembly is arranged behind the co-extrusion assembly, and comprises an edge cutting support, an edge cutting roller, a circular blade, an edge cutting driving member and a blade adjusting member, the edge cutting roller, the edge cutting driving member and the blade adjusting member are arranged on the edge cutting support, the edge cutting roller is connected with the driving end of the edge cutting driving member, the circular blade is rotatably connected with the blade adjusting member, the circular blade abuts against the edge cutting roller, and the blade adjusting member is used for adjusting the height and horizontal position of the circular blade.

10. The plastic sheet manufacturing apparatus according to claim 1, characterized by: The pulling assembly is arranged behind the co-extrusion assembly or the drying assembly, and comprises a pulling support, a pulling driving roller arranged on the pulling support, a pulling driven roller and a pulling driving member, the pulling driving roller abuts against the pulling driven roller, the driving end of the pulling driving member is connected with the pulling driving roller, and the rotational linear speed of each pulling driving roller is the same.

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