Antistatic abs plate and its manufacturing process

Abstract

This invention relates to the field of ABS sheet technology. This application discloses an antistatic ABS sheet and its manufacturing process, comprising an ABS sheet layer and a polyvinyl chloride (PVC) core, and a multilayer sheet structure obtained by lamination. Grooves are provided at the long sides of both the ABS sheet layer and the PVC core. The middle layer of the multilayer sheet structure is a PVC core, and the top and bottom surfaces of the PVC core are fixedly connected to the ABS sheet layer by cold bonding with structural adhesive. The sides of the incompletely cured ABS sheet layer are cut using an extruder to form regular serrated grooves, facilitating the subsequent assembly of the ABS sheets into a larger and complete sheet. Assembly can be performed by staggered vertical alignment, thereby improving overall strength and avoiding the high cost associated with directly producing large-area ABS sheets. This method offers advantages such as better antistatic stability, excellent mechanical properties, and long service life, improving practicality.

Description

Technical Field

[0001] This application relates to the field of ABS sheet technology, and in particular to an antistatic ABS sheet with a polyvinyl chloride core and its manufacturing process. Background Technology

[0002] Antistatic ABS sheets are widely used in precision electronics, cleanrooms, and equipment enclosures due to their excellent comprehensive mechanical properties and ease of processing. Existing antistatic ABS sheets are mainly modified by adding inorganic conductive fillers or organic antistatic agents, but this method has significant drawbacks. To reduce production costs, the sheet area is small, and gaps are left between sheets during assembly, weakening the antistatic ability. Furthermore, simple assembly cannot maintain structural stability over long-term use, failing to achieve both long-term antistatic performance and excellent mechanical properties. Therefore, it is necessary to develop an antistatic ABS sheet with stable antistatic effects, excellent mechanical properties, and a long service life. Summary of the Invention

[0003] This application proposes an antistatic ABS board and its manufacturing process, which has the advantage of improving the antistatic effect of assembly through a sawtooth meshing method, thereby solving the problem of gaps easily generated during the assembly of traditional boards.

[0004] To achieve the above objectives, this application adopts the following technical solution: it includes an ABS board layer and a polyvinyl chloride board core, and a multi-layer board structure is obtained by lamination. Grooves are provided at the long sides of both the ABS board layer and the polyvinyl chloride board core. The middle layer of the multi-layer board structure is a polyvinyl chloride board core, and the upper and lower surfaces of the polyvinyl chloride board core are fixedly connected to the ABS board layer by cold bonding with structural adhesive. Furthermore, permanent conductive masterbatch, conductive polymer and antistatic agent are added to the raw materials.

[0005] 2. An antistatic ABS sheet according to claim 1, characterized in that the depth of the groove is 25cm, the angle between the side edge and the bottom edge of the groove is 45°, and the multiple multi-layer board structures can form a complete sheet through the mutual cooperation of the grooves.

[0006] 3. A manufacturing process for antistatic ABS sheets, comprising the following steps: S1. Add the corresponding raw material to the extrusion device and melt the raw material using a heating device; S2: Single screw segmented temperature control, shearing plasticization, homogeneous melting, stable and continuous extrusion of mixed melt; S3. The continuous slab is extruded by evenly distributing the flow through the extrusion chamber and the flat die head, and the slab is cut into a sawtooth groove during the extrusion process. S4. The extruded slab immediately enters the three-roll calender. Through the extrusion and leveling of the upper and lower rolls, the thickness of the slab is calibrated and the surface flatness is corrected. At the same time, the roll temperature is controlled (80-100℃) to assist the slab in initial cooling and shaping, and to reduce the shrinkage and deformation of the slab. S5. The calendered sheet is fed into the cooling device, which uses a combination of air cooling and water cooling (air cooling to lower the temperature first, and water cooling to completely solidify the shape) to ensure that the sheet temperature drops to room temperature. At the same time, it is pulled at a constant speed by the traction machine, and the traction speed is matched with the extrusion speed. S6. The ABS board layer obtained through the above process is bonded to the polyvinyl chloride board core by cold bonding with structural adhesive, and then reinforced by lamination to obtain a multilayer board structure.

[0007] S7. According to the requirements, the multi-layer board structure is spliced ​​together by the fit between the grooves to form a larger board structure, and an insulating film is applied to the outer surface by vacuum lamination to finally obtain an antistatic ABS board.

[0008] Furthermore, it includes a rear extrusion chamber and a front extrusion chamber, which are connected end-to-end and have interconnected internal cavities. Molten ABS is extruded through the front opening of the front extrusion chamber and cooled to form a sheet. The rear extrusion chamber has a front connecting valve port at its tail end, and a heating device is fixedly installed at one end of the front connecting valve port. Two connecting pipe interfaces are provided on the top surface of the rear extrusion chamber near its tail end. A pressure-limiting one-way valve is fixedly installed on the top of the connecting pipe interface. The pressure-limiting one-way valve only allows material inside the rear extrusion chamber to pass through. The rear extrusion chamber is fixed on both sides. A reflux device is installed. A baffle device is movably fitted inside the front extrusion chamber. Mounting slots are opened on both sides of the front extrusion chamber, and positioning devices are fixedly installed inside the mounting slots. A support frame is fixedly installed at the bottom of the front extrusion chamber. A base plate is fixedly installed at the bottom of the support frame. Ribs are fixedly installed on the top of the base plate at positions on both sides of the support frame. A servo motor is fixedly fitted on the top of the ribs. A rotating device is fixedly installed at one end of the output shaft of the servo motor. A connecting plate is fixedly installed on the top of the front extrusion chamber. An arc-shaped anti-drip plate is fixedly installed on the top of the connecting plate.

[0009] Furthermore, the return device includes a fixed plate, one end of which is fixedly mounted with a storage seat. An extrusion chamber is formed on one side of the storage seat. Passage grooves are formed on the top and bottom of the storage seat near one side, communicating with the extrusion chamber. A guide channel is provided at the top of the storage seat, communicating with a pressure-limiting one-way valve. ABS resin material in a high-temperature molten state enters the interior of the extrusion chamber through the guide channel, thereby heating the material inside. A return channel is provided at the front end of the storage seat, communicating with the inner cavity of the extrusion chamber. A telescopic mechanism is provided at the end of the storage seat, with its output shaft extending into the interior of the extrusion chamber. An extrusion plate is fixedly mounted at one end of the telescopic mechanism's output shaft. When the telescopic mechanism operates, it pushes the extrusion plate to move inside the extrusion chamber, extruding the material inside and discharging it through the return channel.

[0010] Furthermore, the positioning device includes a positioning plate, a positioning groove is provided on one side of the positioning plate, a guide strip is fixedly installed on the top of the positioning plate at the position outside the positioning groove, and an extension plate is provided on the outer surface of the positioning plate near the top, the extension plate is connected to the front extrusion chamber by bolt connection.

[0011] Specifically, the positioning devices are installed symmetrically in groups on the top and bottom surfaces of the front extrusion chamber, and the bottom surface of the positioning plate is flush with the top and bottom surfaces of the inner cavity of the front extrusion chamber.

[0012] Furthermore, the heating device includes a screw extrusion channel, a heater is sleeved on the outer surface of the screw extrusion channel, and return interfaces are provided on both sides of the screw extrusion channel, the return interfaces being connected to the inner cavity of the screw extrusion channel.

[0013] Specifically, the return material interface is connected to the return material channel, and the front end of the screw extrusion channel is connected to the front connecting valve port.

[0014] Furthermore, the material blocking device includes a rotating shaft, which is movably sleeved inside the front extrusion chamber. A material blocking plate is fixedly installed on the outer surface of the rotating shaft. Spring levers are movably sleeved at both ends of the rotating shaft and at positions outside the front extrusion chamber. The spring levers are connected to the rotating shaft via springs.

[0015] Furthermore, the rotating device includes a hollow turntable, and a cutting seat is provided on the front of the hollow turntable near the outer side. The cutting seat is hollow and communicates with the inner cavity of the hollow turntable. A push rod is provided on the front of the hollow turntable near the inner side. The cutting seat and the push rod are distributed in a circular array.

[0016] Specifically, the cutting seat cooperates with the through groove and the positioning groove. When the groove between the two cutting seats rotates to the position between the positioning plates, the interior of the front extrusion chamber forms a complete channel. When the cutting seat rotates to the position between the positioning plates, it will cut the material inside the front extrusion chamber and create a notch.

[0017] Specifically, the arc-shaped anti-drip plate is in contact with the cutting seat located above the front extrusion chamber.

[0018] Specifically, the hollow turntable is filled with coolant, and the coolant level reaches the middle position of the hollow turntable's inner cavity.

[0019] Furthermore, when the cutting seat rotates to the position between the positioning plates, the push rod contacts the spring pawl and pushes the baffle plate to rotate, at which time the interior of the front extrusion chamber is in a closed state.

[0020] This application has the following beneficial effects.

[0021] 1. Using polyvinyl chloride (PVC) core as the core board can effectively reduce the overall manufacturing cost. The thickness or number of layers of PVC core can also be adjusted according to the needs to improve the overall structural strength. The whole board is not easy to bend or collapse, and has stronger load-bearing capacity. In addition, the overall flame retardant performance of the board is improved. At the same time, using PVC core as the core board has the advantages of moisture resistance, water resistance, and non-absorption of water deformation. Moreover, the thermal deformation range is small, the board has higher flatness and more stable dimensions.

[0022] 2. Cut the two sides of the ABS sheet to form regular sawtooth grooves, and assemble them by staggering the upper and lower sections to improve the overall strength.

[0023] 3. When the rotating device rotates, the cutting seat can be used to cut the ABS material, thereby forming continuous serrated grooves on both sides of the ABS resin material. This production method can combine the cutting process with the extrusion process, which simplifies the production process, improves production efficiency, and reduces production costs.

[0024] 4. Some of the cut material will remain in the gap between the cutting seats. This remaining material will move to the return device position as the hollow turntable rotates. The output shaft of the telescopic machine will push the extrusion plate to move inside the extrusion chamber, returning the remaining ABS material to the inside of the screw extrusion channel for further heating and participation in the extrusion process.

[0025] 5. The curved anti-drip plate contacts the cutting seat located above the front extrusion chamber, thereby preventing the ABS material remaining between the cutting seats from dripping under the action of gravity during the rotation of the hollow turntable.

[0026] 6. When the cutting seat moves to the bottom of the rear extrusion chamber and the front extrusion chamber, the coolant cools the cutting seat. The cooled cutting seat can cool and solidify the cutting area of ​​the ABS material, avoiding the problem of groove deformation during subsequent extrusion.

[0027] 7. When the cutting seat moves to the position between the positioning plates, the baffle plate is raised inside the front extrusion chamber and blocks the ABS material inside the front extrusion chamber. The pressure generated by the extruder movement will squeeze the ABS material in a high-temperature molten state into the extrusion chamber through the pressure limiting single-way valve and the material guide channel, and mix it with the ABS material with a lower temperature located between the cutting seats, thereby playing an auxiliary heating role. Attached Figure Description

[0028] The accompanying drawings, which form part of this specification, illustrate embodiments disclosed in this application and, together with the specification, serve to explain the principles disclosed in this application.

[0029] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein: Figure 1 This is a structural diagram of the ABS sheet of the present invention; Figure 2 This is a partial structural diagram of the ABS sheet of the present invention; Figure 3 This is a diagram of the internal structure of the ABS sheet of the present invention; Figure 4 This is an assembly diagram of the ABS sheet material of the present invention; Figure 5 This is a diagram of the extrusion apparatus of the present invention; Figure 6 This is a structural diagram of the extrusion chamber of the present invention; Figure 7 This is a cross-sectional view of the extrusion chamber of the present invention; Figure 8 This is a diagram of the recirculation device structure of the present invention; Figure 9 This is a cross-sectional view of the recirculation device of the present invention; Figure 10 This is a diagram of the structural positioning device of the present invention; Figure 11 This is a diagram of the heating device structure of the present invention; Figure 12 This is a cross-sectional view of the heating device of the present invention; Figure 13 This is a diagram of the material-stopping device of the present invention; Figure 14 This is an exploded view of the material-blocking device of the present invention; Figure 15 This is a diagram of the rotating device structure of the present invention; Figure 16This is a cross-sectional view of the rotating device of the present invention.

[0030] In the diagram: 1. ABS sheet layer; 2. Groove; 10. Rear extrusion chamber; 11. Front extrusion chamber; 12. Front connecting valve port; 13. Heating device; 131. Screw extrusion channel; 132. Heater; 133. Return material interface; 14. Connecting pipe interface; 15. Pressure limiting single-way valve; 16. Return device; 161. Fixing plate; 162. Material storage seat; 163. Extrusion hopper; 164. Through groove; 165. Guide channel; 166. Return channel; 167. Extension 168. Extrusion plate; 17. Material stop device; 171. Rotating shaft; 172. Material stop plate; 173. Spring lever; 18. Positioning device; 181. Positioning plate; 182. Positioning groove; 183. Guide bar; 184. Extension plate; 19. Support frame; 20. Base plate; 21. Rib plate; 22. Servo motor; 23. Rotating device; 231. Hollow turntable; 232. Cutting seat; 233. Push rod; 24. Connecting plate; 25. Arc-shaped anti-drip plate. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0032] An antistatic ABS sheet, please refer to Figures 1-4 The material includes an ABS board layer 1 and a polyvinyl chloride board core 3, and a multi-layer board structure is obtained by lamination. Grooves 2 are provided at the long side of both the ABS board layer 1 and the polyvinyl chloride board core 3. The middle layer of the multi-layer board structure is a polyvinyl chloride board core 3, and the top and bottom surfaces of the polyvinyl chloride board core 3 are fixedly connected to the ABS board layer 1 by cold bonding with structural adhesive. Permanent conductive masterbatch, conductive polymer and antistatic agent are added to the raw materials.

[0033] Please see Figures 1-4 The groove 2 has a depth of 25cm and the angle between the side and bottom of the groove 2 is 45°. The multiple multi-layer board structures can be combined with each other through the groove 2 to form a complete board.

[0034] Using polyvinyl chloride (PVC) cores can effectively reduce overall manufacturing costs, improve overall structural strength, make the board less prone to bending and collapse, increase load-bearing capacity, and enhance overall flame retardancy. In addition, using PVC cores provides advantages such as moisture resistance, water resistance, and non-absorption of water, resulting in less thermal deformation, higher board flatness, and more stable dimensions.

[0035] During the production process, an extruder is used to cut the two sides of the incompletely cured ABS sheet layer to form regular serrated grooves 2. This facilitates the subsequent assembly of the ABS sheets into a larger and complete sheet. Furthermore, the sheets can be assembled by staggering the upper and lower sections, thereby improving the overall strength. This avoids the problem of excessively high costs caused by directly producing large-area ABS sheets. The sheets also have the advantages of better antistatic stability, excellent mechanical properties, and long service life, thus improving their practicality.

[0036] A manufacturing process for antistatic ABS sheets includes the following steps: S1. Add the corresponding raw material to the extrusion device and melt the raw material using a heating device; S2: Single screw segmented temperature control, shearing plasticization, homogeneous melting, stable and continuous extrusion of mixed melt; S3. The continuous slab is extruded by evenly distributing the flow through the extrusion chamber and the flat die head, and the slab is cut into a sawtooth groove during the extrusion process. S4. The extruded slab immediately enters the three-roll calender. Through the extrusion and leveling of the upper and lower rolls, the thickness of the slab is calibrated and the surface flatness is corrected. At the same time, the roll temperature is controlled (80-100℃) to assist the slab in initial cooling and shaping, and to reduce the shrinkage and deformation of the slab. S5. The calendered sheet is fed into the cooling device, which uses a combination of air cooling and water cooling (air cooling to lower the temperature first, and water cooling to completely solidify the shape) to ensure that the sheet temperature drops to room temperature. At the same time, it is pulled at a constant speed by the traction machine, and the traction speed is matched with the extrusion speed. S6. The ABS board layer 1 obtained by the above process is bonded to the polyvinyl chloride board core 2 by cold bonding with structural adhesive, and reinforced by lamination. Finally, an insulating film is applied to the outermost layer by vacuum lamination to obtain an antistatic ABS board.

[0037] S7. According to the requirements, the antistatic ABS sheets are spliced ​​together by the fit between the grooves 2 to form a larger and more complete ABS sheet.

[0038] Please see Figures 5-7The system includes a rear extrusion chamber 10 and a front extrusion chamber 11, which are connected end-to-end and have interconnected internal cavities. Molten ABS is extruded through the front opening of the front extrusion chamber 11 and cooled to form a sheet. A front connecting valve port 12 is provided at the rear of the rear extrusion chamber 10, and a heating device 13 is fixedly installed at one end of the front connecting valve port 12. Two connecting pipe interfaces 14 are provided on the top surface of the rear extrusion chamber 10 near the rear end. A pressure-limiting single-way valve 15 is fixedly installed on the top of the connecting pipe interface 14. The pressure-limiting single-way valve 15 only allows material inside the rear extrusion chamber 10 to pass through. Two connecting pipe interfaces 14 are fixedly installed on both sides of the rear extrusion chamber 10. The reflux device 16 has a material blocking device 17 movably fitted inside the front extrusion chamber 11. The front extrusion chamber 11 has mounting slots on both sides, and a positioning device 18 is fixedly installed inside the mounting slots. A support frame 19 is fixedly installed at the bottom of the front extrusion chamber 11. A base plate 20 is fixedly installed at the bottom of the support frame 19. Ribs 21 are fixedly installed on the top of the base plate 20 at the positions on both sides of the support frame 19. A servo motor 22 is fixedly fitted on the top of the ribs 21. A rotating device 23 is fixedly installed at one end of the output shaft of the servo motor 22. A connecting plate 24 is fixedly installed on the top of the front extrusion chamber 11. An arc-shaped anti-drip plate 25 is fixedly installed on the top of the connecting plate 24.

[0039] Please see Figures 8-9 The reflux device 16 includes a fixed plate 161, with a storage base 162 fixedly installed at one end of the fixed plate 161. An extrusion chamber 163 is provided on one side of the storage base 162. Passage grooves 164 are provided on the top and bottom of the storage base 162 near one side, communicating with the extrusion chamber 163. A guide channel 165 is provided on the top of the storage base 162, communicating with a pressure-limiting one-way valve 15. ABS resin material in a high-temperature molten state enters the interior of the extrusion chamber 163 through the guide channel 165, thus... The material in the storage seat 162 is heated. A return channel 166 is provided at the front end of the storage seat 162. Both the guide channel 165 and the return channel 166 are connected to the inner cavity of the extrusion chamber 163. A telescopic conveyor 167 is provided at the end of the storage seat 162. The output shaft of the telescopic conveyor 167 extends into the interior of the extrusion chamber 163. An extrusion plate 168 is fixedly installed at one end of the output shaft of the telescopic conveyor 167. When the telescopic conveyor 167 is running, it will push the extrusion plate 168 to move inside the extrusion chamber 163, extruding the material inside the extrusion chamber 163 and discharging it through the return channel 166.

[0040] Please see Figure 5 and Figure 10The positioning device 18 includes a positioning plate 181, a positioning groove 182 is provided on one side of the positioning plate 181, a guide strip 183 is fixedly installed on the top of the positioning plate 181 at the position outside the positioning groove 182, and an extension plate 184 is provided on the outer surface of the positioning plate 181 near the top, and the extension plate 184 is connected to the front extrusion chamber 11 by bolt connection.

[0041] Please see Figure 6 and Figure 10 The positioning devices 18 are installed symmetrically in groups on the top and bottom surfaces of the front extrusion chamber 11, and the bottom surface of the positioning plate 181 is flush with the top and bottom surfaces of the inner cavity of the front extrusion chamber 11.

[0042] Please see Figures 11-12 The heating device 13 includes a screw extrusion channel 131, a heater 132 is sleeved on the outer surface of the screw extrusion channel 131, and return interfaces 133 are provided on both sides of the screw extrusion channel 131, which are connected to the inner cavity of the screw extrusion channel 131.

[0043] Please see Figures 7-8 and Figure 12 The return material interface 133 is connected to the return material channel 166, and the front end of the screw extrusion channel 131 is connected to the front connecting valve port 12.

[0044] Please see Figures 13-14 The baffle device 17 includes a rotating shaft 171, which is movably sleeved inside the front extrusion chamber 11. A baffle plate 172 is fixedly installed on the outer surface of the rotating shaft 171. Spring levers 173 are movably sleeved at both ends of the rotating shaft 171 and at positions outside the front extrusion chamber 11. The spring levers 173 are connected to the rotating shaft 171 by springs.

[0045] Please see Figures 15-16 The rotating device 23 includes a hollow turntable 231. A cutting seat 232 is provided on the front side of the hollow turntable 231 near the outer side. The cutting seat 232 is hollow and communicates with the inner cavity of the hollow turntable 231. A push rod 233 is provided on the front side of the hollow turntable 231 near the inner side. The cutting seat 232 and the push rod 233 are distributed in a circular array.

[0046] The cutting seat 232 cooperates with the through groove 164 and the positioning groove 182. When the groove between the two cutting seats 232 rotates to the position between the positioning plates 181, the interior of the front extrusion chamber 11 forms a complete channel. When the cutting seat 232 rotates to the position between the positioning plates 181, it will cut the material inside the front extrusion chamber 11 and create a notch.

[0047] During the operation of the extruder, the rotating device 23 rotates synchronously. When the gap between the cutting seats 232 rotates to the position between the positioning plates 181, the ABS resin material inside the front extrusion chamber 11 can pass through the front extrusion chamber 11 completely. When the cutting seats 232 rotate to the position between the positioning plates 181, the ABS resin material inside the front extrusion chamber 11 will be cut, thereby forming serrated grooves 2 on both sides of the ABS resin material. During the continuous rotation of the rotating device 23, continuous and regular serrated grooves 2 will be formed on both sides of the ABS sheet. This production method can combine the cutting process with the extrusion process, which simplifies the production process, improves production efficiency, and reduces production costs.

[0048] After the cutting seat 232 finishes cutting the ABS sheet, it will be displaced from the positioning device 18 as the hollow turntable 231 rotates. At this time, some of the cut material will remain in the gap between the cutting seats 232. This remaining material will move to the return device 16 position as the hollow turntable 231 rotates. At this time, the output shaft of the telescopic conveyor 167 pushes the extrusion plate 168 to move inside the extrusion chamber 163. During this process, the extrusion plate 168 extrudes the material remaining in the gap between the cutting seats 232, thereby extruding the ABS material into the screw extrusion channel 131 through the return channel 166. This returns the remaining ABS material to the screw extrusion channel 131 for further heating and participation in the extrusion process, preventing the ABS material from solidifying in the gap between the cutting seats 232 and failing to function properly. It also avoids the waste of ABS material and improves the reliability of the device.

[0049] Please see Figure 6 and Figure 15 The arc-shaped anti-drip plate 25 contacts the cutting seat 232 located above the front extrusion chamber 11.

[0050] By having the arc-shaped anti-drip plate 25 contact the cutting seat 232 located above the front extrusion chamber 11, the ABS material remaining between the cutting seats 232 is prevented from dripping under the action of gravity during the rotation of the hollow turntable 231, thus preventing this part of the ABS material from moving into the extrusion chamber 163 and causing material waste, thereby improving the practicality of the device.

[0051] Please see Figure 15 The hollow turntable 231 is filled with coolant, and the coolant level reaches the middle position of the inner cavity of the hollow turntable 231.

[0052] When the cutting seat 232 moves to the area below the rear extrusion chamber 10 and the front extrusion chamber 11, the hollow turntable 231 is filled with coolant, and the coolant level reaches the middle position of the inner cavity of the hollow turntable 231, thereby cooling the cutting seat 232. When the cooled cutting seat 232 moves to the position between the positioning plates 181 and cuts the ABS material, the cooled cutting seat 232 can perform cooling and curing treatment on the cut part of the ABS material, avoiding the problem that the sawtooth groove 2 after cutting will deform under stress during the subsequent extrusion process, which will prevent it from being properly assembled, thus improving the reliability of the device.

[0053] Please see Figure 6 , Figure 10 , Figure 13 and Figure 15 When the cutting seat 232 rotates to the position between the positioning plates 181, the push rod 233 contacts the spring pawl 173 and pushes the baffle plate 172 to rotate. At this time, the interior of the front extrusion chamber 11 is in a closed state.

[0054] When the cutting seat 232 moves to the position between the positioning plates 181 and cuts the ABS material, the push rod 233 pushes the spring lever 173 and drives the baffle plate 172 to rotate, causing the baffle plate 172 to lift inside the front extrusion chamber 11 and block the ABS material inside the front extrusion chamber 11. At this time, the extrusion of the ABS material stops. At the same time, the pressure generated by the extruder movement will squeeze the ABS material in a high-temperature molten state into the extrusion chamber 163 through the pressure limiting single-way valve 15 and the guide channel 165, and mix it with the ABS material with a lower temperature located between the cutting seats 232, thereby playing an auxiliary heating role. This avoids the problem that the ABS material left between the cutting seats 232 will solidify due to the decrease in temperature, which would prevent the extrusion plate 168 from extruding it normally, thus improving the stability of the device during operation.

[0055] The method of using this invention is as follows: During operation, the rotating device 23 rotates synchronously while the extruder is running. When the gap between the cutting seats 232 rotates to the position between the positioning plates 181, the ABS resin material inside the front extrusion chamber 11 can pass through the front extrusion chamber 11 completely. When the cutting seats 232 rotate to the position between the positioning plates 181, they cut the ABS resin material inside the front extrusion chamber 11, thus forming serrated grooves 2 on both sides of the ABS resin material. During the continuous rotation of the rotating device 23, continuous and regular serrated grooves 2 are formed on both sides of the ABS sheet. This production method combines the cutting process with the extrusion process, which simplifies the production process. After the cutting seat 232 completes the cutting of the ABS sheet, it will be displaced from the positioning device 18 as the hollow turntable 231 rotates. At this time, some of the cut material will remain in the gap between the cutting seats 232. This remaining material will move to the position of the return device 16 as the hollow turntable 231 rotates. At this time, the output shaft of the telescopic conveyor 167 pushes the extrusion plate 168 to move inside the extrusion chamber 163. During this process, the extrusion plate 168 extrudes the material remaining in the gap between the cutting seats 232, thereby extruding the ABS material through the return channel 166 into the inside of the screw extrusion channel 131, thus returning the remaining ABS material to the inside of the screw extrusion channel 131 for further heating and participation in the extrusion process. The curved anti-drip plate 25 contacts the cutting seat 232 located above the front extrusion chamber 11, supporting the ABS material remaining between the cutting seats 232 and preventing the ABS material remaining between the cutting seats 232 from dripping due to gravity during the rotation of the hollow turntable 231. When the cutting seat 232 moves to below the rear extrusion chamber 10 and the front extrusion chamber 11, the cutting seat 232 is cooled because the hollow turntable 231 is filled with coolant and the coolant level reaches the middle of the inner cavity of the hollow turntable 231. When the cooled cutting seat 232 moves to the position between the positioning plates 181 and cuts the ABS material, the cooled cutting seat 232... 2. The cutting area of ​​the ABS material can be cooled and cured. When the cutting seat 232 moves to the position between the positioning plates 181 and cuts the ABS material, the push rod 233 will push the spring pawl 173 and drive the baffle plate 172 to rotate, so that the baffle plate 172 is lifted inside the front extrusion chamber 11 and blocks the ABS material inside the front extrusion chamber 11. At this time, the extrusion of the ABS material stops. At the same time, the pressure generated by the extruder movement will squeeze the ABS material in the high temperature molten state into the extrusion chamber 163 through the pressure limiting single-way valve 15 and the guide channel 165, and mix it with the ABS material with a lower temperature located between the cutting seats 232, thereby playing an auxiliary heating role.

Claims

1. An antistatic ABS sheet, characterized in that, The structure includes an ABS board layer (1) and a polyvinyl chloride board core (3), and a multi-layer board structure is obtained by lamination. The long side of both the ABS board layer (1) and the polyvinyl chloride board core (3) is provided with a groove (2). The middle layer of the multi-layer board structure is a polyvinyl chloride board core (3), and the upper and lower surfaces of the polyvinyl chloride board core (3) are fixedly connected to the ABS board layer (1) by cold bonding with structural adhesive.

2. The antistatic ABS sheet according to claim 1, characterized in that, The groove (2) has a depth of 25cm and the angle between the side and bottom of the groove (2) is 45°. The multiple multi-layer board structures can form a complete board by cooperating with each other through the groove (2).

3. A manufacturing process for antistatic ABS sheets, comprising the following steps: S1. Add the corresponding raw material to the extrusion device and melt the raw material using a heating device; S2: Single screw segmented temperature control, shearing plasticization, homogeneous melting, stable and continuous extrusion of mixed melt; S3. The continuous slab is extruded by evenly distributing the flow through the extrusion chamber and the flat die head, and the slab is cut into a sawtooth groove during the extrusion process. S4. The extruded slab immediately enters the three-roll calender. Through the extrusion and leveling of the upper and lower rolls, the thickness of the slab is calibrated and the surface flatness is corrected. At the same time, the roll temperature is controlled to assist the slab in initial cooling and shaping, and to reduce the shrinkage and deformation of the slab. S5. The calendered sheet is fed into the cooling device, which uses a combination of air cooling and water cooling to ensure that the sheet temperature drops to room temperature. At the same time, it is pulled at a constant speed by the traction machine, and the traction speed is matched with the extrusion speed. S6. The ABS board layer (1) obtained by the above process is bonded to the polyvinyl chloride board core (2) by cold bonding with structural adhesive, and reinforced by lamination to obtain a multilayer board structure. S7. According to the requirements, the multi-layer board structure is spliced ​​together by the cooperation between the grooves (2) to form a larger board structure, and an insulating film is applied to the outer surface by vacuum coating to finally obtain an antistatic ABS board.

4. The manufacturing process of an antistatic ABS sheet according to claim 3, characterized in that, The extrusion device includes a rear extrusion chamber (10) and a front extrusion chamber (11). The rear extrusion chamber (10) and the front extrusion chamber (11) are connected end to end and their internal cavities are interconnected. A front connecting valve port (12) is provided at the tail of the rear extrusion chamber (10). A heating device (13) is fixedly installed at one end of the front connecting valve port (12). A connecting pipe interface (14) is provided on the top surface of the rear extrusion chamber (10) near the tail. There are two connecting pipe interfaces (14). A pressure-limiting single-way valve (15) is fixedly installed on the top of the connecting pipe interface (14). A reflux device (16) is fixedly installed on both sides of the rear extrusion chamber (10). A baffle device is movably fitted inside the front extrusion chamber (11). 17) The front extrusion chamber (11) has mounting slots on both sides, and a positioning device (18) is fixedly installed inside the mounting slots. A support frame (19) is fixedly installed at the bottom of the front extrusion chamber (11). A base plate (20) is fixedly installed at the bottom of the support frame (19). Ribs (21) are fixedly installed on the top of the base plate (20) at the positions on both sides of the support frame (19). A servo motor (22) is fixedly sleeved on the top of the rib plate (21). A rotating device (23) is fixedly installed at one end of the output shaft of the servo motor (22). A connecting plate (24) is fixedly installed on the top of the front extrusion chamber (11). An arc-shaped anti-drip plate (25) is fixedly installed on the top of the connecting plate (24).

5. The manufacturing process of an antistatic ABS sheet according to claim 4, characterized in that, The return device (16) includes a fixed plate (161), a storage seat (162) is fixedly installed at one end of the fixed plate (161), an extrusion chamber (163) is provided on one side of the storage seat (162), a passage groove (164) is provided at the top and bottom of the storage seat (162) near one side, the passage groove (164) is connected to the extrusion chamber (163), a guide channel (165) is provided at the top of the storage seat (162), a return channel (166) is provided at the front end of the storage seat (162), the guide channel (165) and the return channel (166) are both connected to the inner cavity of the extrusion chamber (163), a telescopic machine (167) is provided at the end of the storage seat (162), the output shaft of the telescopic machine (167) extends into the interior of the extrusion chamber (163), and an extrusion plate (168) is fixedly installed at one end of the output shaft of the telescopic machine (167). The material guide channel (165) is connected to the pressure limiting one-way valve (15).

6. The manufacturing process of an antistatic ABS sheet according to claim 5, characterized in that, The positioning device (18) includes a positioning plate (181), a positioning groove (182) is provided on one side of the positioning plate (181), a guide strip (183) is fixedly installed on the top of the positioning plate (181) at the position outside the positioning groove (182), and an extension plate (184) is provided on the outer surface of the positioning plate (181) near the top. The extension plate (184) is connected to the front extrusion chamber (11) by bolt connection. The positioning devices (18) are installed symmetrically in groups on the top and bottom surfaces of the front extrusion chamber (11), and the bottom surface of the positioning plate (181) is flush with the top and bottom surfaces of the inner cavity of the front extrusion chamber (11).

7. The manufacturing process of an antistatic ABS sheet according to claim 6, characterized in that, The heating device (13) includes a screw extrusion channel (131), a heater (132) is sleeved on the outer surface of the screw extrusion channel (131), and return interfaces (133) are provided on both sides of the screw extrusion channel (131). The return interfaces (133) are connected to the inner cavity of the screw extrusion channel (131). The return material interface (133) is connected to the return material channel (166), and the front end of the screw extrusion channel (131) is connected to the front connecting valve port (12).

8. The manufacturing process of an antistatic ABS sheet according to claim 7, characterized in that, The baffle device (17) includes a rotating shaft (171), which is movably sleeved inside the front extrusion chamber (11). A baffle plate (172) is fixedly installed on the outer surface of the rotating shaft (171). Spring paddles (173) are movably sleeved at both ends of the rotating shaft (171) and at positions outside the front extrusion chamber (11). The spring paddles (173) are connected to the rotating shaft (171) through springs.

9. The manufacturing process of an antistatic ABS sheet according to claim 8, characterized in that, The rotating device (23) includes a hollow turntable (231). A cutting seat (232) is provided on the front side of the hollow turntable (231) near the outer side. The cutting seat (232) is hollow and communicates with the inner cavity of the hollow turntable (231). A push rod (233) is provided on the front side of the hollow turntable (231) near the inner side. The cutting seat (232) and the push rod (233) are distributed in a ring array. The cutting seat (232) cooperates with the through groove (164) and the positioning groove (182). When the groove between the two cutting seats (232) rotates to the position between the positioning plates (181), the interior of the front extrusion chamber (11) forms a complete channel. When the cutting seat (232) rotates to the position between the positioning plates (181), it will cut the material inside the front extrusion chamber (11) and create a notch. The arc-shaped anti-drip plate (25) is in contact with the cutting seat (232) located above the front extrusion chamber (11); The hollow turntable (231) is filled with coolant, and the coolant level reaches the middle position of the inner cavity of the hollow turntable (231).

10. The manufacturing process of an antistatic ABS sheet according to claim 9, characterized in that, When the cutting seat (232) rotates to the position between the positioning plates (181), the push rod (233) contacts the spring pawl (173) and pushes the baffle plate (172) to rotate. At this time, the interior of the front extrusion chamber (11) is in a closed state.

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