Production process of high flame-retardant plastic plate

Abstract

The application discloses a production process of high-flame-retardant plastic plate, belongs to the technical field of plastic plate production, and comprises limiting installation operation, cross support frame installation on both sides of the middle partition plate, upper plate slotting operation, flame-retardant upper plate slotting, lower plate slotting operation, flame-retardant lower plate and middle partition plate installation, and upper plate installation operation, flame-retardant upper plate and synthetic part installation. The cross support frame enters the inside of the cutting groove, realizes the installation of the flame-retardant upper plate, the flame-retardant lower plate and the middle partition plate, avoids displacement during installation, fills liquid glue in the inside of the cutting groove of the flame-retardant lower plate, coats the upper plane of the flame-retardant lower plate with the emulsion glue, so that the liquid glue can be fully mixed in the gap between the cross support frame and the cutting groove when the middle partition plate is pressed down, the cross support frame and the cutting groove are fully connected, and the bonding quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of plastic sheet production technology, specifically a production process for high flame-retardant plastic sheets. Background Technology

[0002] The production of high flame-retardant plastic sheets involves mixing fire-retardant and flame-resistant additives with plastic raw materials. The mixture is then processed through steps such as calendering and pressing to form a sheet-like product. The main raw materials are polypropylene, polyethylene, and polystyrene, with the addition of flame retardants such as magnesium oxide, aluminum oxide, aluminum hydroxide, and potassium chloride, as well as a certain proportion of plasticizers, stabilizers, and other auxiliary materials. High flame-retardant plastic sheets have excellent fire-resistant and flame-retardant properties and can be widely used in construction, decoration, transportation, and power industries.

[0003] The production process of high flame retardant plastic sheets includes: (1) raw material pretreatment, mixing various plastic raw materials according to a predetermined ratio, and then drying, screening and other treatments; (2) mixing, mixing the pretreated plastic raw materials, additives and auxiliary materials to ensure the uniformity of the finished product; (3) calendering, heating the mixed material to the state of extrusion and calendering, and extruding it into sheet shape through a calender; (4) cooling, placing the calendered sheet on a cooling table for cooling to achieve the required hardness and dimensional stability; (5) cutting, cutting the cooled sheet through an automatic or manual cutting machine to cut it into the required size according to various specifications; (6) post-treatment, performing surface treatment, edge sealing and other processing on the cut sheet.

[0004] The patent application with application number 202122351223.0 discloses a flame-retardant polystyrene plastic sheet, and specifically discloses that by setting an isolation layer and a flame-retardant layer, the plastic sheet body has a flame-retardant function, and can control the flame along the direction of the sheet in the event of a fire.

[0005] In the above technical solution, in order to ensure the production efficiency of the sheet, the calendered sheet is usually in the shape of a sheet with uniform width. When installing the sheet, the isolation layer, and the flame retardant layer, the sheet, the isolation layer, and the flame retardant layer need to be matched in position first. The sheet, the isolation layer, and the flame retardant layer are usually fixed by adhesive. During use, in order to achieve the stability of the adhesive, longitudinal pressure needs to be applied so that the sheet, the isolation layer, and the flame retardant layer can fully contact each other and the adhesive can play a stable bonding role. However, when longitudinal pressure is applied, the sheet, the isolation layer, and the flame retardant layer will be misaligned, which will require the finished product to be trimmed. Summary of the Invention

[0006] The purpose of this invention is to provide a production process for highly flame-retardant plastic sheets.

[0007] The technical problem solved by this invention is to address the issue in the prior art where misalignment occurs when the board, the isolation layer, and the flame-retardant layer are installed, necessitating further processing of the finished product.

[0008] This invention can be achieved through the following technical solution: a production process for high flame-retardant plastic sheets, comprising the following steps:

[0009] Step 1: Limiting installation operation. Apply glue to the sides of the cross support frame, place the cross support frame on both sides of the middle partition, and dry the cross support frame.

[0010] Step 2: Grooving operation of the upper plate. First, the flame-retardant upper plate is initially grooved using a spiral grooving knife. Then, the groove of the flame-retardant upper plate is cut flat using a flat grooving knife to obtain a cutting groove. The cutting groove corresponds to the size of the cross support frame.

[0011] Step 3: Grooving operation of the lower plate. First, the flame-retardant lower plate is initially grooved using a spiral grooving knife. Then, the groove of the flame-retardant lower plate is cut flat using a flat grooving knife to obtain a cutting groove. The cutting groove corresponds to the size of the cross support frame.

[0012] Step 4: Lower plate installation operation. Fill the cutting groove of the flame-retardant lower plate with liquid glue, apply emulsion glue to the upper surface of the flame-retardant lower plate, control the cross support frame at the bottom of the middle partition to enter the cutting groove, apply longitudinal pressure to make the glue be evenly squeezed into the cutting groove, and dry the flame-retardant lower plate and the middle partition.

[0013] Step 5: Install the upper plate. Flip the flame-retardant upper plate upwards. Fill the cutting groove of the flame-retardant upper plate with liquid glue. Apply emulsion glue to the upper surface of the flame-retardant upper plate. Control the cross support frame at the bottom of the composite board to enter the cutting groove of the flame-retardant upper plate. Apply longitudinal pressure to make the glue be evenly squeezed into the cutting groove. Dry the resulting plastic board.

[0014] A further technical improvement of the present invention is that, when the spiral grooving cutter is used, the third motor is started and the transmission mechanism drives the spiral grooving cutter to move laterally, grooving the flame-retardant upper plate and the flame-retardant lower plate respectively, thus completing the initial grooving of the flame-retardant upper plate and the flame-retardant lower plate respectively.

[0015] A further technical improvement of the present invention is that when the conveying mechanism is started, the third motor drives the conveyor belt to provide power to the conveying gear. The conveying gear drives the spiral grooving cutter through gear transmission. The spiral grooving cutter has a shape in which the spiral size decreases sequentially.

[0016] A further technical improvement of the present invention is that, when the planar grooving cutter is used, by activating the second telescopic rod, the planar grooving cutter at the end of the second telescopic rod is moved longitudinally, and the planar grooving cutter is pressed tightly against the bottom of the cutting groove. The bottom of the cutting groove is cut flat by using the laterally moving planar grooving cutter.

[0017] A further technical improvement of the present invention is that: when switching between the spiral grooving cutter and the planar grooving cutter, the second motor is started to drive the rotating base to rotate, thereby controlling the switching between the spiral grooving cutter and the planar grooving cutter arranged on both sides of the rotating base.

[0018] A further technical improvement of the present invention is that: when the spiral grooving cutter and the flat grooving cutter move laterally, the first motor is started, which causes the lead screw assembly to start, and controls the sliding block to slide laterally under the limiting action of the supporting slide rod.

[0019] A further technical improvement of the present invention is that: during the installation of the flame-retardant upper plate, the flame-retardant upper plate is fixed, and by activating the clamping telescopic rod, the clamping plate is controlled to move toward the cutting groove of the flame-retardant upper plate, and the flame-retardant upper plate is clamped by the clamping plate.

[0020] A further technical improvement of the present invention is that: when the clamping plate is in use, the cross support frame is pressed against the cutting groove, and the residual glue flows along the cutting groove onto the clamping plate, and the residual glue is discharged through the residual glue leakage hole.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By setting an intermediate partition, the flame-retardant performance of the plastic sheet is further enhanced. Therefore, the intermediate partition includes a flame-retardant layer and an isolation layer. During the installation of the flame-retardant upper and lower plates, a cross-shaped support frame enters the cutting groove to facilitate the installation of the flame-retardant upper and lower plates and the intermediate partition. This prevents displacement during installation and allows for direct edge sealing of the synthesized plastic sheet, resulting in the finished plastic sheet. In this process, the cutting groove is created through cutting, improving the sheet production efficiency. During production, a sheet-like material is directly obtained through a calender. After grooving the sheet, the flame-retardant upper and lower plates are obtained. In use, liquid adhesive is filled into the cutting groove of the flame-retardant lower plate, and an emulsion adhesive is applied to the upper surface of the flame-retardant lower plate. This allows the intermediate partition and the flame-retardant lower plate to bond together when the intermediate partition is pressed down. The use of emulsion adhesive allows it to be squeezed out and pressed within the cutting groove. This ensures the liquid adhesive is fully mixed within the gaps between the cross support frame and the cutting groove, guaranteeing a proper connection. This prevents misalignment during bonding of the flame-retardant lower plate and the middle partition, while also filling gaps and ensuring a high-quality bond. The flame-retardant lower plate and middle partition are then dried to form a composite board. When installing the flame-retardant upper plate, the composite board and flame-retardant upper plate are installed by filling the cutting groove with liquid adhesive. This fills the gaps between the cross support frame and the cutting groove at the bottom of the composite board, and the emulsion adhesive adheres the flame-retardant upper plate to the composite board. After drying, the finished board is obtained, thus achieving the fixed installation of the flame-retardant upper plate, middle partition, and flame-retardant lower plate.

[0023] 2. The third motor drives the conveyor belt to rotate, which in turn drives the transmission gear to rotate, causing the spiral grooving cutter to perform grooving. Because the spiral grooving cutter has a small front radius and a large rear radius, it will gradually groove the flame-retardant upper plate. That is, the first motor drives the lead screw assembly to start, which drives the sliding block to move. The moving and rotating spiral grooving cutter performs the grooving operation on the flame-retardant upper plate. At this time, the cutting groove is not perfect, and there are uncut areas at the bottom. The second motor is started, and the rotation of the rotating base controls the position switching of the spiral grooving cutter and the flat grooving cutter. The second telescopic rod is started to control the flat grooving cutter to contact the inside of the cutting groove and cut the remaining protrusions inside the cutting groove. Then, the fragments cut off inside the cutting groove are sucked out. When the cross support frame is placed inside the cutting groove, because the inside of the cutting groove has not been ground, there is a small space to hold liquid adhesive. When pressure is applied to the middle partition, the adhesive will not be completely squeezed out, ensuring the installation connection of the middle partition and the flame-retardant upper plate.

[0024] 3. When clamping the flame-retardant upper plate, place the end of the flame-retardant upper plate on the horizontal plate. Use the opposing movement of the clamping telescopic rod to control the opposing movement of the horizontal plate and clamp the flame-retardant upper plate. At this time, the center position of the flame-retardant upper plate is located at the center position of the processing platform. When pressure is applied to the middle partition, since the inside of the cutting groove is liquid glue, the glue is squeezed and fully fills the gap between the cutting groove and the cross support frame. The residual glue gradually falls and is collected through the residual glue leakage hole, which facilitates the reuse of residual glue and reduces waste. Attached Figure Description

[0025] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0026] Figure 1 This is a flowchart of the present invention;

[0027] Figure 2 This is a schematic diagram showing the positions of the flame-retardant upper plate, the middle partition plate, and the flame-retardant lower plate of the present invention;

[0028] Figure 3 This is a schematic diagram showing the position of the cross support frame of the present invention;

[0029] Figure 4 This is a schematic diagram showing the location of the grooving mechanism of the present invention;

[0030] Figure 5 This is a schematic diagram showing the position of the lead screw assembly of the present invention;

[0031] Figure 6 This is a schematic diagram of the grooving mechanism of the present invention;

[0032] Figure 7 This is a schematic diagram showing the position of the clamping plate in this invention;

[0033] Figure 8 This is a schematic diagram of the clamping plate structure of the present invention.

[0034] In the diagram: 1. Flame-retardant upper plate; 2. Middle partition plate; 3. Flame-retardant lower plate; 4. Cutting groove; 5. Cross support frame; 6. Top telescopic rod; 7. Support slide rod; 8. First motor; 9. Grooving mechanism; 901. Second motor; 902. Conveyor belt; 903. Back plate; 904. Conveyor gear; 905. Spiral grooving cutter; 906. Third motor; 907. Spiral support seat; 908. First telescopic rod; 909. First support seat; 91. 0. First rotating rod; 911. Rotating base; 912. Second rotating rod; 913. Second support base; 914. Second telescopic rod; 915. Slotting support base; 916. Flat slotting cutter; 10. Sliding groove; 11. Lead screw assembly; 12. Sliding block; 13. Slotting bracket; 14. Machining platform; 15. Clamping groove; 16. Clamping plate; 161. Vertical plate; 162. Residual glue leakage hole; 163. Horizontal plate; 17. Clamping telescopic rod. Detailed Implementation

[0035] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0036] Please see Figure 1-8 As shown, a production process for a high flame-retardant plastic sheet includes the following steps:

[0037] Step 1: Limiting installation operation. Take out two sets of cross support frames 5, apply glue to the sides of the cross support frames 5, place the cross support frames 5 on both sides of the middle partition 2, pass cold air through the middle partition 2 to dry the cross support frames 5, and obtain the middle partition 2 with limiting mechanisms on both sides.

[0038] Step 2: Grooving operation of the upper plate. Take out the flame-retardant upper plate 1. First, use the spiral grooving knife 905 to make a preliminary groove on the flame-retardant upper plate 1. Then, use the flat grooving knife 916 to cut the groove of the flame-retardant upper plate 1 flat so that the cut groove can correspond to the size of the cross support frame 5.

[0039] Step 3: Lower plate grooving operation. Take out the flame-retardant lower plate 3. First, use the spiral grooving knife 905 to make a preliminary grooving of the flame-retardant lower plate 3. Then, use the flat grooving knife 916 to cut the groove of the flame-retardant lower plate 3 flat so that the cut groove can correspond to the size of the cross support frame 5.

[0040] Step 4: Lower plate installation operation. Fill the inside of the cutting groove 4 of the flame-retardant lower plate 3 with liquid glue. Apply emulsion glue to the upper surface of the flame-retardant lower plate 3. Control the middle partition 2 to be installed on the flame-retardant lower plate 3. Control the cross support frame 5 at the bottom of the middle partition 2 to enter the inside of the cutting groove 4. Apply longitudinal pressure to make the glue be evenly squeezed into the inside of the cutting groove 4. Dry the flame-retardant lower plate 3 and the middle partition 2.

[0041] Step 5: Install the upper plate. Flip the flame-retardant upper plate 1 upwards. Fill the cutting groove 4 of the flame-retardant upper plate 1 with liquid glue. Apply emulsion glue to the upper surface of the flame-retardant upper plate 1. Control the cross support frame 5 at the bottom of the composite board to enter the cutting groove 4 of the flame-retardant upper plate 1. Apply longitudinal pressure to make the glue be evenly squeezed into the cutting groove 4. Dry the resulting plastic board.

[0042] When the spiral grooving cutter 905 is in use, the third motor 906 is started and the transmission mechanism drives the spiral grooving cutter 905 to move laterally, grooving the flame-retardant upper plate 1 and the flame-retardant lower plate 3 respectively, thus completing the initial grooving of the flame-retardant upper plate 1 and the flame-retardant lower plate 3 respectively.

[0043] When the conveying mechanism is started, the third motor 906 drives the conveyor belt 902 to provide power to the conveying gear 904. The conveying gear 904 drives the spiral grooving cutter 905 through gear transmission. The spiral grooving cutter 905 has a spiral size that decreases sequentially.

[0044] When the flat grooving cutter 916 is used, the flat grooving cutter 916 at the end of the second telescopic rod 914 is moved longitudinally by activating the second telescopic rod 914, and the flat grooving cutter 916 is pressed tightly against the bottom of the cutting groove 4. The bottom of the cutting groove 4 is cut flat by the laterally moving flat grooving cutter 916, so that the cutting groove 4 adapts to the size of the cross support frame 5.

[0045] When switching between the spiral grooving cutter 905 and the flat grooving cutter 916, the second motor 901 is started, which drives the rotating base 911 to rotate, thereby controlling the switching between the spiral grooving cutter 905 and the flat grooving cutter 916 set on both sides of the rotating base 911.

[0046] When the spiral grooving cutter 905 and the flat grooving cutter 916 move laterally, the first motor 8 is started, which causes the lead screw assembly 11 to start, and controls the sliding block 12 to slide laterally under the limiting action of the support slide rod 7.

[0047] During the installation of the flame-retardant upper plate 1, the flame-retardant upper plate 1 is fixed. By activating the clamping telescopic rod 17, the clamping plate 16 is controlled to move toward the cutting groove 4 of the flame-retardant upper plate 1, and the flame-retardant upper plate 1 is clamped by the clamping plate 16.

[0048] When the clamping plate 16 is in use, the cross support frame 5 is pressed against the cutting groove 4, and the residual glue flows along the cutting groove 4 onto the clamping plate 16. The residual glue is slowly discharged through the residual glue leakage hole 162.

[0049] The processing device includes a support slide rod 7, which is fixedly installed at the output end of a top telescopic rod 6. The height of the support slide rod 7 is controlled by the top telescopic rod 6, which is fixed to a top plate. The top plate is rotatable and used to adjust the grooving direction of the grooving mechanism 9. Specifically, a first motor 8 is fixed to the side of the support slide rod 7. A sliding groove 10 is formed on the support slide rod 7, and a lead screw assembly 11 is installed inside the sliding groove 10. A sliding block 12 is threaded onto the lead screw assembly 11 and is slidably connected to the sliding groove 10. A grooving bracket 13 is fixed to the side of the sliding block 12, and the grooving mechanism 9 is mounted on the grooving bracket 13. Specifically, by starting the first motor 8, the lead screw assembly 11 is driven, causing the sliding block 12 to slide inside the sliding groove 10, thereby moving the grooving bracket 13 and thus enabling the grooving mechanism 9 to move laterally, controlling the grooving process.

[0050] The grooving mechanism 9 includes a second motor 901, which is fixed on the grooving bracket 13. The second motor 901 drives the rotating base 911, on which a first rotating rod 910 and a second rotating rod 912 are symmetrically fixed. The grooving bracket 13 is U-shaped. Specifically, a first support base 909 is fixed to the end of the first rotating rod 910, and a first telescopic rod 908 is fixed to the side of the first support base 909. A spiral support base 907 is fixed to the end of the first telescopic rod 908, and a third motor 906 is fixed to the spiral support base 907. The third motor 906 drives the connected conveyor wheel, and through the action of the conveyor belt 902, drives the adjacent conveyor wheel to rotate. A conveyor gear 904 is fixed to the end of the conveyor wheel. The conveyor gear 904, through meshing, drives the spiral grooving cutter 905 to rotate. During this process, through the action of the conveyor belt 902 and the conveyor gear 904, the spiral grooving cutter 905 is moved away from the third motor 906, so that the spiral grooving cutter 905 can avoid the width interference of the third motor 906 when grooving. During this process, the spiral grooving cutter 905 has a spiral size that gradually increases from the grooving start end to the end end.

[0051] Furthermore, a slotted support base 915 is fixed to the end of the second rotating rod 912, and a flat slotting knife 916 is fixed on the slotted support base 915. The flat slotting knife 916 is inclined and its end and side are sharp, so as to flatten the side and bottom of the cutting groove 4 to adapt it to the shape and size of the cross support frame 5.

[0052] It also includes a processing platform 14, on which multiple sets of clamping slots 15 are formed. The clamping slots 15 are arranged in a circular array around the processing platform 14. A clamping telescopic rod 17 is fixed inside the clamping slot 15. A clamping plate 16 is fixed at the end of the clamping telescopic rod 17. The clamping plate 16 includes a vertical plate 161 and a horizontal plate 163. The vertical plate 161 and the horizontal plate 163 are arranged in an "L" shape. Residual glue leakage holes 162 are formed at corresponding positions of the vertical plate 161 and the horizontal plate 163 to discharge residual glue.

[0053] This production process for a high flame-retardant plastic sheet enhances its flame-retardant properties by incorporating a middle partition 2. The middle partition 2 includes a flame-retardant layer and an isolation layer. During installation of the flame-retardant upper plate 1 and flame-retardant lower plate 3, a cross support frame 5 enters the cutting groove 4 to facilitate the installation of the flame-retardant upper plate 1, flame-retardant lower plate 3, and middle partition 2, preventing displacement during installation. This allows for direct edge sealing of the synthesized plastic sheet, resulting in a finished product. The cutting groove 4 is created through cutting, improving production efficiency. During production, a sheet-like material is directly obtained using a calender. After grooving the sheet, the flame-retardant upper plate 1 and flame-retardant lower plate 3 are obtained. In use, liquid adhesive is filled into the cutting groove 4 of the flame-retardant lower plate 3, and an emulsion adhesive is applied to the upper surface of the flame-retardant lower plate 3. This ensures that when the middle partition 2 is pressed down, the flame-retardant upper plate 1 and flame-retardant lower plate 3 are properly sealed. The lower flame-retardant plate 3 can be extruded using emulsion adhesive. The liquid adhesive is pressed within the cutting groove 4, ensuring it is fully mixed within the gap between the cross support frame 5 and the cutting groove 4. This guarantees a proper connection between the cross support frame 5 and the cutting groove 4, preventing misalignment during bonding of the flame-retardant lower plate 3 and the middle partition 2, and filling the gaps to ensure bonding quality. The lower flame-retardant plate 3 and the middle partition 2 are then dried to form a composite board. When installing the upper flame-retardant plate 1, the composite board and the upper flame-retardant plate 1 are installed by filling the cutting groove 4 with liquid adhesive. This fills the gap between the cross support frame 5 and the cutting groove 4 at the bottom of the composite board. The emulsion adhesive adheres the upper flame-retardant plate 1 to the composite board. After drying, the finished board is obtained, thus achieving the fixed installation of the upper flame-retardant plate 1, the middle partition 2, and the lower flame-retardant plate 3.

[0054] The third motor 906 drives the conveyor belt 902 to rotate, which in turn drives the transmission gear 904 to rotate, causing the spiral grooving cutter 905 to perform grooving. Because the spiral grooving cutter 905 has a small front radius and a large rear radius, it gradually grooves the flame-retardant upper plate 1. Alternatively, the first motor 8 drives the lead screw assembly 11 to move the sliding block 12, and the moving and rotating spiral grooving cutter 905 performs the grooving operation on the flame-retardant upper plate 1. At this point, the cutting groove 4 is not perfectly formed, with uncut areas at the bottom. The second motor 901 is then started, using the rotating base 9... The rotation of 11 controls the position switching of the spiral grooving cutter 905 and the flat grooving cutter 916. By activating the second telescopic rod 914, the flat grooving cutter 916 contacts the inside of the cutting groove 4 to cut the remaining protrusions inside the cutting groove 4. Then, the fragments cut off inside the cutting groove 4 are sucked out. When the cross support frame 5 is placed inside the cutting groove 4, since the inside of the cutting groove 4 has not been polished, there is a small space to contain the liquid adhesive. When pressure is applied to the middle partition 2, the adhesive will not be completely squeezed out, ensuring the installation connection between the middle partition 2 and the flame-retardant upper plate 1.

[0055] When clamping the flame-retardant upper plate 1, the end of the flame-retardant upper plate 1 is placed on the horizontal plate 163. By using the opposing movement of the clamping telescopic rod 17, the horizontal plate 163 is controlled to move in opposite directions to clamp the flame-retardant upper plate 1. At this time, the center position of the flame-retardant upper plate 1 is located at the center position of the processing platform 14. When pressure is applied to the middle partition plate 2, since the inside of the cutting groove 4 is liquid glue, after the glue is squeezed, it fully fills the gap between the cutting groove 4 and the cross support frame 5. The residual glue gradually falls and is collected through the residual glue leakage hole 162, which facilitates the reuse of the residual glue and reduces waste.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A production process for high flame-retardant plastic sheets, characterized in that: Includes the following steps: Step 1: Limiting installation operation. Apply glue to the side of the cross support frame (5), place the cross support frame (5) on both sides of the middle partition (2), and dry the cross support frame (5). Step 2: Grooving operation of the upper plate. The flame-retardant upper plate (1) is first initially grooved by a spiral grooving cutter (905). Then, the groove of the flame-retardant upper plate (1) is cut flat by a flat grooving cutter (916) to obtain a cutting groove (4). The cutting groove (4) corresponds to the size of the cross support frame (5). By controlling the longitudinal feed of the flat grooving cutter (916), the bottom of the cutting groove (4) forms a micro-surface to retain a gap space for accommodating liquid glue. Step 3: Grooving operation of the lower plate. The flame-retardant lower plate (3) is first initially grooved by a spiral grooving cutter (905), and then the groove of the flame-retardant lower plate (3) is cut flat by a flat grooving cutter (916) to obtain a cutting groove (4). The cutting groove (4) corresponds to the size of the cross support frame (5). Step 4: Lower plate installation operation. Fill the inside of the cutting groove (4) of the flame-retardant lower plate (3) with liquid glue, apply emulsion glue to the upper surface of the flame-retardant lower plate (3), control the cross support frame (5) at the bottom of the middle partition (2) to enter the inside of the cutting groove (4), apply longitudinal pressure to make the glue be evenly squeezed into the inside of the cutting groove (4), and dry the flame-retardant lower plate (3) and the middle partition (2). Step 5: Install the upper plate. Turn the flame-retardant upper plate (1) upward and fill the cutting groove (4) of the flame-retardant upper plate (1) with liquid glue. Apply emulsion glue to the upper surface of the flame-retardant upper plate (1). Control the cross support frame (5) at the bottom of the composite board to enter the cutting groove (4) of the flame-retardant upper plate (1). Apply longitudinal pressure to make the glue be evenly squeezed into the cutting groove (4). Dry the generated plastic board. When the flat grooving cutter (916) is used, the flat grooving cutter (916) at the end of the second telescopic rod (914) is moved longitudinally by activating the second telescopic rod (914), and the flat grooving cutter (916) is pressed tightly against the bottom of the cutting groove (4). The bottom of the cutting groove (4) is cut flat by using the laterally moving flat grooving cutter (916). When switching between the spiral grooving cutter (905) and the flat grooving cutter (916), the second motor (901) is started to drive the rotating base (911) to rotate, thereby controlling the spiral grooving cutter (905) and the flat grooving cutter (916) set on both sides of the rotating base (911) to switch. When installing the flame-retardant upper plate (1), fix the flame-retardant upper plate (1), and control the clamping plate (16) to move toward the cutting groove (4) of the flame-retardant upper plate (1) by activating the clamping telescopic rod (17), and use the clamping plate (16) to clamp the flame-retardant upper plate (1); When the clamping plate (16) is in use, the cross support frame (5) is squeezed toward the cutting groove (4), and the residual glue flows along the cutting groove (4) onto the clamping plate (16). The residual glue is discharged through the residual glue leakage hole (162).

2. The production process of a high flame-retardant plastic sheet according to claim 1, characterized in that, When the spiral grooving cutter (905) is used, the third motor (906) is started and the transmission mechanism is used to drive the spiral grooving cutter (905) to move laterally, and to groove the flame-retardant upper plate (1) and the flame-retardant lower plate (3) respectively, thus completing the initial grooving of the flame-retardant upper plate (1) and the flame-retardant lower plate (3) respectively.

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