Modified polyethylene packaging plate for steel coil packaging as well as preparation system and preparation method of modified polyethylene packaging plate

Abstract

The invention discloses a modified polyethylene packaging plate for steel coil packaging as well as a preparation system and a preparation method thereof. The modified polyethylene packaging plate comprises a high-speed mixer and a detection device, the detection device comprises a sampling mechanism, a testing mechanism and a rechecking mechanism; the testing mechanism comprises a testing pipe, a pushing plate used for pushing materials, a pushing piece used for controlling the pushing plate to move, an identifying assembly used for identifying whether water flows out of the materials or not, and a cleaning assembly used for cleaning water in the testing pipe. The test tube is used for receiving a sample extracted by the sampling mechanism and is mounted at the bottom of the high-speed mixer, and the pushing plate is used for pushing materials in the test tube. The polyethylene packaging board has the effect of detecting whether the porous calcium silicate modified powder is dried or not, and the obtained polyethylene packaging board has the advantages of being low in density, high in strength and good in heat preservation performance.

Description

Technical Field

[0001] The present application relates to the field of modified polyethylene packaging materials, and in particular to modified polyethylene packaging sheets for steel coil packaging and a preparation system and method thereof. Background Art

[0002] At present, polyethylene packaging sheets are widely used in building exterior walls, steel protection, food, shipping and other related fields, showing great use value and economic value. At present, the common filling materials of polyethylene packaging sheets are inorganic fillers such as calcium carbonate, calcium silicate, silicon dioxide, titanium dioxide and kaolin. These inorganic fillers are usually solid spherical particles with a density of more than 32.0g / cm and mesh sizes ranging from 400 mesh to 3000 mesh. Filling polyethylene packaging sheets with inorganic fillers can not only effectively reduce costs, but also increase the impact resistance of polyethylene packaging sheets. However, solid spherical inorganic fillers greatly increase the density of the product, increase the difficulty of its construction in actual application, and limit the application amount and field of polyethylene packaging sheets.

[0003] In the related art, a Chinese patent with publication number CN103865153A proposes a method for preparing a synthetic porous calcium silicate modified powder filled polyethylene packaging sheet, which belongs to the field of packaging sheet processing technology. The preparation method selects synthetic porous calcium silicate powder as the main material, and prepares it into synthetic porous calcium silicate modified powder after drying, weakening of nucleation ability and improvement of antioxidant performance, surface silane coupling agent modification, surface self-assembly, and lubrication modification. Then, the synthetic porous calcium silicate modified powder and polyethylene are prepared into synthetic porous calcium silicate modified powder filled polyethylene packaging sheet through a hot-cut double-stage extruder and a sheet forming extruder production line. The synthetic porous calcium silicate modified powder filled polyethylene packaging sheet prepared by the above scheme has the characteristics of low density, high strength, heat preservation, sound insulation and high adsorption. The preparation method of the present invention has a simple process, low equipment requirements, convenient operation and control, and is easy to realize industrial production without the need for special equipment.

[0004] With respect to the above-mentioned related technologies, the inventors believe that there are the following defects: in the process of drying the porous calcium silicate modified powder, there is no step for detecting the moisture content of the porous calcium silicate modified powder. If the porous calcium silicate modified powder is not dried, it will affect the normal subsequent mixing reaction of the porous calcium silicate modified powder with other materials, and ultimately affect the quality of the finished product. Summary of the invention

[0005] In order to improve the problem that it is impossible to determine whether the porous calcium silicate modified powder is dried, the present application provides a modified polyethylene packaging sheet for steel coil packaging and a preparation system and method thereof.

[0006] The present application provides a system for preparing a modified polyethylene packaging sheet for steel coil packaging using the following technical solutions: A preparation system for a modified polyethylene packaging sheet for steel coil packaging, comprising a high-speed mixer and a detection device arranged on the high-speed mixer; The detection device includes a sampling mechanism for taking materials, a testing mechanism for measuring whether the materials contain water, and a review mechanism for further testing whether the materials contain water. The testing mechanism includes a testing tube, a pushing plate for pushing materials, a pushing member for controlling the movement of the pushing plate, an identification component for identifying whether water is discharged from the materials, and a cleaning component for cleaning water in the testing tube; The test tube is used to receive the sample extracted by the sampling mechanism and is installed at the bottom of the high-speed mixer, and the pushing plate pushes the material in the test tube.

[0007] Optionally, the identification component includes a filter, a test paper that moves in contact with the bottom wall of the filter, a color sensor, a plurality of guide rollers for fitting the test paper to the bottom of the filter, and a winding assembly for winding the test paper, the test tube is provided with filter holes, the filter is installed at the position of the filter holes, the color sensor identifies the state in which the test paper turns red when it comes into contact with water, and the color sensor is electrically connected to a buzzer.

[0008] Optionally, the winding assembly includes multiple winding ropes, multiple silicone sheets, two winding rollers and two winding motors. The winding rollers rotate at the bottom of the outer wall of the test tube. The winding motor is used to control the rotation of the winding rollers. The test papers are arranged in multiple numbers. The multiple winding ropes, multiple silicone sheets and multiple test papers are arranged at intervals. The silicone sheet is also fixed between the two winding ropes. The silicone sheet is used to adsorb water flowing out of the filter.

[0009] Optionally, the cleaning component includes a heating element for heating and drying the test tube and a viewing portion for marking whether the test tube is dried. The high-speed mixer is provided with a heating chamber at the upper part of the test tube, and the heating element is arranged in the heating chamber.

[0010] Optionally, the viewing part includes a viewing block slidably arranged in the test tube, a power group for controlling the movement of the viewing block, a sponge block for wiping the inside of the test tube, and a reaction piece for reacting to whether there is water on the inner wall of the test tube. The viewing block is provided with two annular grooves on its outer wall, and the sponge block and the reaction piece are respectively installed in the two annular grooves. The test tube is also provided with a trigger piece at the initial position for identifying whether the reaction piece reacts, and the viewing block is slidably adapted to the test tube.

[0011] Optionally, the power group includes two guide rails and a sliding rod, the two guide rails are respectively fixed in the test tube and are symmetrically arranged relative to the central axis of the test tube, the two ends of the sliding rod are respectively mounted on the two guide rails, the sliding rod is fixedly connected to the viewing block, the viewing block is also slidably mounted on the two guide rails, and the viewing block is made of insulating material.

[0012] Optionally, the sampling mechanism includes a sampling plate, a driving member, a loosening rod, a first rack, a second rack and a gear. The high-speed mixer is provided with a sampling port at the bottom, the sampling port is connected to the test tube and the length directions are arranged perpendicular to each other, the sampling plate slides in the sampling port, the driving member controls the reciprocating motion of the sampling plate, the bottom wall of the high-speed mixer is provided with an operating cavity, the first rack and the second rack both slide in the operating cavity, the gear rotates in the operating cavity, the first rack and the second rack are respectively located on both sides of the gear, the loosening rod passes through the operating cavity and moves into the sampling port and is located above the sampling plate, and the first rack is fixedly connected to the end of the sampling plate.

[0013] Optionally, the review mechanism includes a review tube, a drying plate, a drying part arranged in the drying plate, an electromagnet, a lifting plate, a gravity sensor, a lifting part and a feeding plate for returning the material to the high-speed mixer. The test tube is provided with a review port. Both ends of the review tube are open and inclined. One end of the review tube is connected to the test tube, and the other end is directly opposite to the top of the drying plate. The gravity sensor is used to connect the electromagnet and the lifting plate. The electromagnet adsorbs the drying plate, and the lifting part lifts the lifting plate. The feeding plate is slidably arranged on the top side wall of the high-speed mixer, and the movement direction of the feeding plate is perpendicular to the movement direction of the lifting plate.

[0014] The present application provides a method for preparing a modified polyethylene packaging sheet for steel coil packaging using the following technical scheme: A method for preparing a modified polyethylene packaging sheet for steel coil packaging comprises the following steps: S1. Synthetic porous calcium silicate modified powder: firstly, the porous calcium silicate powder is dried, and the drying quality is detected by a detection device, the weakening of the nucleation ability and the antioxidant performance of the synthetic porous calcium silicate powder are improved, the surface of the synthetic porous calcium silicate powder is modified by a silane coupling agent, the surface of the surface-modified synthetic porous calcium silicate powder is self-assembled, and the surface of the surface-modified synthetic porous calcium silicate powder is self-assembled; S2. Preparation of synthetic porous calcium silicate modified powder filled polyethylene granules: the synthetic porous calcium silicate modified powder obtained in step 1 is mixed according to the following mass percentages: 50-90% polyethylene and 10-50% synthetic porous calcium silicate modified powder; the mixture is placed in a high-speed mixer for mixing at a mixing temperature of 80°C. After mixing for 30 minutes, the mixture of polyethylene and synthetic porous calcium silicate modified powder is taken out and melt-plasticized in the first stage of a hot-cut two-stage extruder and formed and granulated in the second stage to obtain synthetic porous calcium silicate modified powder filled polyethylene granules; S3. Preparation of synthetic porous calcium silicate modified powder-filled polyethylene packaging board: Put the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 into a board forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging board.

[0015] The modified polyethylene packaging sheet for steel coil packaging provided in this application adopts the following technical solution: A modified polyethylene packaging sheet for steel coil packaging is prepared by adopting the preparation method of the modified polyethylene packaging sheet for steel coil packaging.

[0016] In summary, the present application includes at least one of the following beneficial technical effects: 1. It has low density: Due to the high porosity of synthetic porous calcium silicate, the filled polyethylene packaging sheet has a lower density, which helps to reduce the weight of the material and reduce transportation and storage costs; High strength: The modified calcium silicate powder has a strong bonding force with the polyethylene substrate, which significantly improves the tensile strength, bending strength and impact strength of the sheet, allowing it to withstand greater external forces without being easily damaged; Thermal insulation performance: The porous structure makes the synthetic porous calcium silicate have good thermal insulation performance. After filling it into the polyethylene sheet, it can improve the thermal insulation effect of the sheet, which is suitable for packaging scenarios with high requirements for temperature control; Sound insulation performance: The porous structure also gives the sheet good sound insulation performance, which can effectively isolate external noise and provide better protection for the packaging contents; High adsorption: Synthetic porous calcium silicate has excellent adsorption performance, which can absorb harmful gases and odors, and improve the environmental protection and safety of packaging sheets; 2. The two rails are respectively connected to power supplies with opposite positive and negative poles. In this embodiment, the positive and negative poles of the power supplies are respectively connected to the same end of the two rails, and then another positive and negative pole power supply is connected to the other end of the rails. The two ends of the same rail are respectively connected to power supplies with different poles, so that the sliding rod can reciprocate. Turn on a power supply to make the current flow on the two rails and the sliding rod. The two rails, the sliding rod and the external DC power supply form a closed loop. According to the flow direction of the current and Ampere's law, the direction of the magnetic flux lines of the two rails and the sliding rod close to the energized power supply side can be obtained. Then, according to the left-hand rule, it can be obtained that the sliding rod is subjected to The direction of the Ampere force is parallel to the guide rail and points to the push plate, that is, when the guide rail is powered on, the slide bar is acted upon by the Ampere force and moves on the guide rail toward the push plate, thereby driving the inspection block to move. During this process, the sponge member wipes the inner wall of the test tube to prevent impurities from affecting the normal reaction of the reaction member. The reaction member fits the inner wall of the test tube. When the inspection block needs to return to the initial position, this power source can be turned off and another power source can be turned on. At this time, the movement direction of the slide bar is toward the direction away from the push plate. The reaction member is detected by the trigger member. If the reaction member changes color, the test tube needs to be further dried. 3. When the test paper does not detect moisture in the material, it needs to be rechecked. When the material enters the drying plate from the recheck tube, the lifting plate needs to be moved downward until the electromagnet adsorbs the drying plate. The gravity sensor is controlled by the PLC controller and connected to the display screen. At this time, the weight of the drying plate and the material is recorded, and the drying plate is returned to the initial position. The drying part can be a heating wire. The heating wire starts to dry the material. If there is moisture in the material, the moisture evaporates into water vapor. After heating for a period of time, the electromagnet is adsorbed to the drying plate again. If the value of the gravity sensor becomes smaller at this time, it proves that the moisture in the material has evaporated. If the value displayed by the gravity sensor remains unchanged, it proves that the material has indeed been dried. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application; Figure 2 is a schematic diagram of the detection device in Example 1 of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 is a schematic diagram of the power group in Example 1 of the present application; Figure 5 It is a schematic diagram of the winding rope, silicone sheet and test paper in Example 1 of the present application.

[0018] 1. High-speed mixer; 2. Test tube; 3. Push plate; 4. Push member; 5. Filter screen; 6. Test paper; 7. Color sensor; 8. Guide roller; 9. Filter hole; 10. Buzzer; 11. Winding rope; 12. Winding roller; 13. Silicone sheet; 14. Heating member; 15. Heating chamber; 16. Viewing block; 17. Sponge block; 18. Reaction member; 19. Ring groove; 20. Trigger member; 21. Guide rail; 22. Sliding rod; 23. Sampling plate; 24. Driving member; 25. Loose rod; 26. First rack; 27. Second rack; 28. Gear; 29. ​​Sampling port; 30. Verification tube; 31. Drying plate; 32. Drying member; 33. Electromagnet; 34. Lifting plate; 35. Gravity sensor; 36. Feeding plate; 37. Verification port; 38. Lifting member. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-5 This application is described in further detail.

[0020] Embodiment 1

[0021] The present application embodiment discloses a system for preparing a modified polyethylene packaging sheet for steel coil packaging. Figure 1-Figure 2 A preparation system of a modified polyethylene packaging sheet for steel coil packaging includes a high-speed mixer 1 and a detection device arranged on the high-speed mixer 1; the detection device includes a sampling mechanism for taking materials, a testing mechanism for measuring whether the material contains water, and a review mechanism for further re-detecting whether the material contains water; the testing mechanism includes a test tube 2, a pushing plate 3 for pushing the material, a pushing member 4 for controlling the movement of the pushing plate 3, an identification component for identifying whether water is discharged from the material, and a cleaning component for cleaning the water in the test tube 2; first, the inner wall of the test tube 2 is cleaned by the cleaning component to ensure that the test tube 2 is in a dry state before sampling, so as not to affect the drying detection accuracy of the test tube 2. When the testing mechanism completes the test, the sample is squeezed by the pushing plate 3. If the sample still does not squeeze out water, it needs to enter the review mechanism for further review to ensure the detection accuracy. If the review result still shows that there is moisture in the surface sample, it proves that the sample is not dried, and the high-speed mixer 1 needs to continue to dry the material.

[0022] Reference Figure 1-Figure 2The test tube 2 is used to receive the sample extracted by the sampling mechanism and is installed at the bottom of the high-speed mixer 1. The pushing plate 3 pushes the material in the test tube 2. The pushing plate 3 is slidably adapted to the test tube 2. The sampling mechanism includes a sampling plate 23, a driving member 24, a loosening rod 25, a first rack 26, a second rack 27 and a gear 28. The high-speed mixer 1 is provided with a sampling port 29 at the bottom. The sampling port 29 is connected to the test tube 2 and the length directions are perpendicular to each other. The sampling plate 23 slides in the sampling port 29 and is also located at the bottom of the sampling port 29 in this embodiment. The driving member 24 can be an electric push rod or a cylinder in this embodiment. The driving member 24 is used to control the reciprocating motion of the sampling plate 23. An operating chamber is provided at the bottom of the high-speed mixer 1. The first rack 26 and the second rack 27 both slide in the operating chamber. The gear 28 rotates in the operating chamber. The first rack 26 and the second rack 27 are respectively located on both sides of the gear 28. The operating chamber is provided with a screw thread for passing through the loosening rod 25. The through hole is connected to the operating cavity and the sampling port 29, the loose rod 25 is slidably adapted to the through hole, and the material will not enter the operating cavity from the through hole. In the initial position, the end of the loose rod 25 is just located in the loose hole. After passing through the operating cavity, the loose rod 25 moves to the sampling port 29 and is located above the sampling plate 23. The end of the first rack 26 is fixedly connected to the end of the sampling plate 23, and the end of the second rack 27 is fixedly connected to the corresponding end of the loose rod 25. When it is necessary to extract samples In order to prevent the material from piling up or even agglomerating on the sampling plate 23, the sampling plate 23 is reciprocated multiple times to ensure that the sampling plate 23 does not leak out of the sampling port 29. The first rack 26 drives the gear 28 to rotate, and the second rack 27 is driven by the gear 28 to slide. During the reciprocating motion of the loosening rod 25 in the loosening port, the loosening rod 25 loosens the material above the sampling plate 23 so that the material can smoothly fall from the sampling port 29 into the test tube 2.

[0023] Reference Figure 2-Figure 4 The identification component includes a filter screen 5, a test paper 6 that moves in contact with the bottom wall of the filter screen 5, a color sensor 7, a plurality of guide rollers 8 for fitting the test paper 6 to the bottom of the filter screen 5, and a winding component for winding the test paper 6. A filter hole 9 is provided at a position of the pipeline close to the partition plate. The test paper 6 uses cobalt chloride test paper, which turns red when it comes into contact with water. The pore size of the filter screen 5 is smaller than the particle size of the material, so that only water can flow out of the filter screen 5, or in this embodiment, the filter screen 5 is replaced with other hard materials for filtering water. The axial direction of the guide roller 8 is perpendicular to the length direction of the test tube 2. The guide roller 8 holds the test paper 6 close to the filter screen 5. The test tube 2 is provided with a filter hole 9. The filter screen 5 is installed at the position of the filter hole 9. The color sensor 7 recognizes that the test paper 6 turns red when it comes into contact with water. The color sensor 7 is electrically connected to a buzzer 10. The color sensor 7 and the buzzer 10 are controlled and connected by a PLC controller. The color sensor 7 is installed at either end of the filter hole 9 and faces the test paper 6.

[0024] Reference Figure 2-Figure 5 The winding assembly includes a plurality of winding ropes 11, a plurality of silicone sheets 13, two winding rollers 12 and two winding motors. The winding roller 12 rotates at the bottom of the outer wall of the test tube 2. The axial direction of the winding roller 12 is arranged parallel to the axial direction of the guide roller 8. The winding motor is used to control the rotation of the winding roller 12, and the winding motor is fixed to the bottom of the test tube 2. The number of test papers 6 is set to be multiple. The plurality of winding ropes 11, the plurality of silicones and the plurality of test papers 6 are arranged at intervals. The silicone sheet 13 is also fixed between the two winding ropes 11. The silicone sheet 1 3 is used to repair the water flowing out of the filter screen 5. Of course, the silicone sheet 13 in this embodiment can also be made of other materials that can absorb water. In this embodiment, the winding rope 11, silicone, winding rope 11, test paper 6, winding rope 11... are arranged in the order, and the winding ropes 11 at both ends are fixedly connected to the outer peripheral walls of the two winding rollers 12 respectively; in the initial state, through the mutual cooperation of the two winding motors, the two winding rollers 12 move the test paper 6 to the lower part of the filter screen 5, and the area of ​​the test paper 6 is larger than the area of ​​the filter screen 5.

[0025] Reference Figure 2-Figure 3 The cleaning component includes a heating element 14 for heating and drying the test tube 2 and a viewing portion for marking whether the test tube 2 is dried. The high-speed mixer 1 is provided with a heating chamber 15 on the upper part of the test tube 2. The heating element 14 is arranged in the heating chamber 15. The heating element 14 can be an electric heating wire. The heating element 14 is close to the inner wall of the heating chamber 15. The heating element 14 heats the test tube 2. If there is moisture on the inner wall of the test tube 2 at this time, the moisture is evaporated into water vapor. At this time, the two winding motors need to cooperate with each other to move the silicone sheet 13 to the bottom of the filter screen 5. At this time, the water vapor is adsorbed by the silicone sheet 13, and the residual water vapor in the test tube 2 is reduced to a minimum to avoid affecting the material detection.

[0026] Reference Figure 2-Figure 3The inspection part includes an inspection block 16 slidably arranged in the test tube 2, a power group for controlling the movement of the inspection block 16, a sponge block 17 for wiping the inside of the test tube 2, and a reaction piece 18 for reacting whether there is water on the inner wall of the test tube 2. The initial position of the inspection block 16 is located at the end of the filter 5 away from the push plate 3, and in this embodiment, the inspection block 16 is adapted to the test tube 2, that is, the material is squeezed by the push plate 3 and the inspection block 16. In the initial state, through the mutual cooperation of the two winding motors, the two winding rollers 12 move the test paper 6 to the lower part of the filter 5. The area of ​​the test paper 6 is larger than the area of ​​the filter 5. At this time, the push plate 3 is controlled to squeeze the material. If there is water in the material, it will be squeezed out and flow out through the filter 5 to the test paper 6. After squeezing for a period of time, the two winding motors are controlled to work and the test paper 6 is moved to the position of the color sensor 7. If the buzzer 10 is triggered to make a sound, it proves that there is water in the material and the material needs to be further dried.

[0027] Reference Figure 2-Figure 4 The inspection block 16 is provided with two annular grooves 19 on its outer wall, and the annular grooves 19 are arranged in a circle. The sponge block 17 and the reaction piece 18 are respectively fixed in the two annular grooves 19, and the sponge block 17 and the reaction piece 18 are both bonded in the annular grooves 19 by glue. In this embodiment, the reaction piece 18 also adopts cobalt chloride test paper, because it is cheap and changes after encountering water. The only inconvenience is that it needs to be replaced, and one end of the test tube 2 can be fixed with bolts, so it is convenient to replace the test paper 6 later. However, in this embodiment, the work of drying the test tube 2 by the heating element 14 does not need to be tested in daily life. It is only when there are doubts about the test results for multiple times that it is necessary to test the inside of the test tube 2. Whether there is moisture is detected, so the frequency of use of the reaction piece 18 is not high, and it will not increase the workload of the staff. In addition, this embodiment determines that the test tube 2 is also provided with a trigger piece 20 at the initial position for identifying whether the reaction piece 18 reacts. The trigger piece 20 also uses a color sensor 7. The trigger piece 20 is convenient for triggering the state of the reaction piece 18 after the reaction. The trigger piece 20 can also be used to control the display light connected through a PLC controller. In this embodiment, it is assumed that if one side of the reaction piece 18 changes color, there will be moisture in other positions of other test tubes 2. Therefore, the color sensor 7 can identify any side and can accurately identify whether there is moisture in the test tube 2.

[0028] The power group includes two guide rails 21 and a slide bar 22. The two guide rails 21 are respectively fixed in the test tube 2 and are symmetrically arranged relative to the central axis of the test tube 2. The two ends of the slide bar 22 are respectively sleeved on the two guide rails 21. The slide bar 22 is fixedly connected to the viewing block 16. The viewing block 16 is also slidably sleeved on the two guide rails 21. The viewing block 16 is made of insulating material. The guide rails 21 and the slide bar 22 are both made of conductive material. The viewing block 16 is also adapted to the two guide rails 21. Similarly, the push plate 3 is also slidably adapted to the two guide rails 21; the two guide rails 21 are respectively externally connected to power supplies with opposite positive and negative poles. In this embodiment, the positive and negative power supplies are respectively connected to the same end of the two guide rails 21, and then another positive and negative power supply is connected to the other end of the guide rails 21. The two ends of the same guide rail 21 are respectively connected to power supplies with different electrodes, so that the slide bar 22 can reciprocate. Turning on a power supply allows current to flow on the two guide rails 21 and the slide bar 22. The guide rail 21, the slide bar 22 and the external DC power supply form a closed loop. According to the direction of current flow and Ampere's law, the direction of the magnetic flux lines of the two guide rails 21 and the slide bar 22 close to the energized power supply side can be obtained. Then, by the left-hand rule, it can be obtained that the direction of the Ampere force on the slide bar 22 is parallel to the guide rail 21 and points to the push plate 3, that is, when the guide rail 21 is energized, the slide bar 22 is acted upon by the Ampere force and moves on the guide rail 21 toward the push plate 3, thereby driving the inspection block 16 to move. In this process, the sponge member wipes the inner wall of the test tube 2 to prevent impurities from affecting the normal reaction of the reaction member 18. The reaction member 18 fits the inner wall of the test tube 2. When the inspection block 16 needs to return to the initial position, this power supply can be turned off and another power supply can be turned on. At this time, the movement direction of the slide bar 22 is toward the direction away from the push plate 3, and the reaction member 18 is detected by the trigger member 20. If the reaction member 18 changes color, the test tube 2 needs to be further dried.

[0029] Reference Figure 2-Figure 3, and when the test paper 6 does not detect that the material has moisture extruded, it is necessary to recheck. The recheck mechanism includes a recheck tube 30, a drying plate 31, a drying member 32 arranged in the drying plate 31, an electromagnet 33, a lifting plate 34, a gravity sensor 35, a lifting member 38 and a feeding plate 36 for returning the material to the high-speed mixer 1. The high-speed mixer 1 is provided with a lifting chamber for the movement of the lifting plate 34. The test tube 2 is provided with a recheck port 37. Both ends of the recheck port 37 are open and clearly set. One end of the recheck tube 30 is connected to the test tube 2, and the position where the recheck tube 30 is connected to the test tube 2 is close to the viewing block 16. In this embodiment, a control panel is provided at the top of the recheck tube 30. The control panel reciprocates through an electric push rod. When the material needs to be weight-rechecked, it is turned on at this time. Control panel, since the distance between the filter screen 5 and the viewing block 16 is small, even if the material is not all on the filter screen 5, the water squeezed out of the material will flow out of the filter screen 5, or the position of the filter screen 5 can be set to be recessed in this embodiment, but it cannot affect the material being pushed into the review tube 30, so after the control panel is opened, the material enters the review tube 30; the other end of the review tube 30 is directly above the drying plate 31, and the gravity sensor 35 is used to connect the electromagnet 33 and the lifting plate 34, the electromagnet 33 adsorbs the drying plate 31, and the lifting member 38 lifts the lifting plate 34, the lifting member 38 adopts an electric push rod or an oil cylinder, the feeding plate 36 slides on the top side wall of the high-speed mixer 1, and the movement direction of the feeding plate 36 is perpendicular to the movement direction of the lifting plate 34, and the movement of the feeding plate 36 can also adopt an electric push rod or an air cylinder.

[0030] When the material enters the drying plate 31 from the review tube 30, the lifting plate 34 needs to be moved downward until the electromagnet 33 adsorbs the drying plate 31. The gravity sensor 35 is controlled by the PLC controller and connected to a display screen. At this time, the weight of the drying plate 31 and the material is recorded, and the drying plate 31 is put back to the initial position. The drying member 32 can be selected from electric heating wires, and the electric heating wires begin to dry the material. If there is moisture in the material, the moisture evaporates into water vapor. After heating for a period of time, the electromagnet 33 and the drying plate 31 are adsorbed again. If the value of the gravity sensor 35 becomes smaller at this time, it proves that the moisture in the material has evaporated. If the value displayed by the gravity sensor 35 remains unchanged, it proves that the material has indeed been dried. Regardless of whether the material chamber is dried or not, the drying plate 31 can be lifted to the position of the feeding plate 36 by the lifting member 38. The feeding plate 36 can push the material into the high-speed mixer 1. Of course, a control panel can also be set at the opening of the lifting chamber to prevent the water vapor in the high-speed mixer 1 from affecting the environment in the lifting chamber.

[0031] The implementation principle of the preparation system of a modified polyethylene packaging sheet for steel coil packaging in the embodiment of the present application is as follows: two guide rails 21 are respectively connected to power supplies with opposite positive and negative poles. In this embodiment, the positive and negative power supplies are respectively connected to the same end of the two guide rails 21, and then another positive and negative power supply is connected to the other end of the guide rail 21, and the two ends of the same guide rail 21 are respectively connected to power supplies with different poles, so that the sliding rod 22 can be reciprocated. Turn on a power supply to make the current flow on the two guide rails 21 and the sliding rod 22. The two guide rails 21, the sliding rod 22 and the external DC power supply form a closed loop. According to the direction of the current flow and Ampere's law, the direction of the magnetic flux lines of the two guide rails 21 and the sliding rod 22 close to the energized power supply side can be obtained, and then By the left-hand rule, it can be obtained that the direction of the Ampere force on the slide bar 22 is parallel to the guide rail 21 and points to the push plate 3, that is, when the guide rail 21 is energized, the slide bar 22 is acted upon by the Ampere force and moves on the guide rail 21 toward the push plate 3, thereby driving the inspection block 16 to move. During this process, the sponge member wipes the inner wall of the test tube 2 to prevent impurities from affecting the normal reaction of the reaction member 18. The reaction member 18 fits the inner wall of the test tube 2. When it is necessary to check that the block 16 returns to the initial position, this power supply can be turned off and another power supply can be turned on. At this time, the movement direction of the slide bar 22 is toward the direction away from the push plate 3, and the reaction member 18 is detected by the trigger member 20. If the reaction member 18 changes color, the test tube 2 needs to be further dried.

[0032] In the initial state, through the cooperation of the two winding motors, the two winding rollers 12 move the test paper 6 to the lower part of the filter 5. The area of ​​the test paper 6 is larger than the area of ​​the filter 5. The push plate 3 is controlled to squeeze the material. If there is moisture in the material, it will be squeezed out and flow out through the filter 5 to the test paper 6. After squeezing for a period of time, the two winding motors are controlled to work and move the test paper 6 to the position of the color sensor 7. If the buzzer 10 is triggered to make a sound, it proves that there is moisture in the material and the material needs to be further dried.

[0033] When the test paper 6 does not detect that there is moisture squeezed out of the material, it is necessary to check again. When the material enters the drying plate 31 from the review tube 30, the lifting plate 34 needs to be moved downward until the electromagnet 33 adsorbs the drying plate 31. The gravity sensor 35 is controlled by the PLC controller and connected to the display screen. At this time, the weight of the drying plate 31 and the material is recorded, and the drying plate 31 is put back to the initial position. The drying part 32 can be a heating wire. The heating wire starts to dry the material. If there is moisture in the material, the moisture evaporates into water vapor. After heating for a period of time, the electromagnet 33 is adsorbed with the drying plate 31 again. If the value of the gravity sensor 35 becomes smaller at this time, it proves that the moisture in the material has evaporated. If the value displayed by the gravity sensor 35 remains unchanged, it proves that the material has indeed been dried.

[0034] Embodiment 2

[0035] The present application example discloses a method for preparing a modified polyethylene packaging sheet for steel coil packaging. Figure 1 A method for preparing a modified polyethylene packaging sheet for steel coil packaging comprises the following steps: S1. Synthetic porous calcium silicate modified powder: firstly dry the porous calcium silicate powder, and detect the drying quality through the detection device, and judge whether there is moisture in the material by whether the test paper 6 changes color. If the test paper 6 does not change color, it is necessary to recheck the weight. If the data before and after drying obtained by the gravity sensor 35 changes, it proves that the material has not been dried and needs to continue drying; improve the weakening of the nucleation ability and antioxidant performance of the synthetic porous calcium silicate powder, modify the surface of the synthetic porous calcium silicate powder with a silane coupling agent, and self-assemble the surface of the surface-modified synthetic porous calcium silicate powder. The surface-modified synthetic porous calcium silicate powder obtained by the above operation is in the following mass percentages: surface-modified synthetic porous calcium silicate powder 96-99 %, titanate coupling agent 0.5-2% aluminate coupling agent 0.5-2%; mix, place in high-speed mixer 1 for self-assembly, the self-assembly temperature is 110-120°C, after 5-30 minutes of self-assembly, the temperature of the surface modified synthetic porous calcium silicate powder of surface self-assembled titanate coupling agent and aluminate coupling agent is reduced to 80-100°C, and the surface modified synthetic porous calcium silicate powder is completed. The first surface self-assembly of the surface modified synthetic porous calcium silicate powder is completed, and then 0.5-2% by mass of rare earth coupling agent HY-041 is added to the synthetic calcium silicate powder after the first surface self-assembly for secondary self-assembly, and the surface self-assembled synthetic porous calcium silicate powder is obtained after 5-15 minutes of secondary self-assembly; lubrication modification of the surface self-assembled synthetic porous calcium silicate powder; S2. Preparation of synthetic porous calcium silicate modified powder filled polyethylene granules: the synthetic porous calcium silicate modified powder obtained in step 1 is mixed according to the following mass percentages: 50-90% polyethylene and 10-50% synthetic porous calcium silicate modified powder; the mixture is placed in a high-speed mixer 1 for mixing at a mixing temperature of 80° C. After mixing for 30 minutes, the mixture of polyethylene and synthetic porous calcium silicate modified powder is taken out and melt-plasticized in the first stage of a hot-cut two-stage extruder and formed and granulated in the second stage to obtain synthetic porous calcium silicate modified powder filled polyethylene granules; S3. Preparation of synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets: putting the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 into a sheet forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets, and putting the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 into a sheet forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets, wherein the sheet forming extruder unit has a length-to-diameter ratio of 35:1, an extrusion speed of 80-105 rpm, and a forming mold is a hanger-type parallel mold, and the temperatures of temperature zones 1 to 12 are 170°C, 170°C, 185°C, 185°C, 180°C, 180°C, 185°C, 175°C, 175°C, 185°C and 185°C, respectively, the mold temperature is 165°C, and the sheet forming traction speed is 2-8 m / min.

[0036] Embodiment 3

[0037] The present application embodiment discloses a modified polyethylene packaging sheet for steel coil packaging. Figure 1 A modified polyethylene packaging sheet for steel coil packaging is prepared by the preparation method of the modified polyethylene packaging sheet for steel coil packaging in Example 2, and has low density: due to the high porosity characteristics of synthetic porous calcium silicate, the filled polyethylene packaging sheet has a lower density, which helps to reduce the weight of the material and reduce transportation and storage costs; high strength: the modified calcium silicate powder has a strong bonding force with the polyethylene substrate, which significantly improves the tensile strength, bending strength and impact strength of the sheet, so that it can withstand greater external forces without being easily damaged; thermal insulation performance: the porous structure makes the synthetic porous calcium silicate have good thermal insulation performance. After being filled into the polyethylene sheet, it can improve the thermal insulation effect of the sheet 34, which is suitable for packaging scenarios with high requirements for temperature control; sound insulation performance: the porous structure also gives the sheet good sound insulation performance, which can effectively isolate external noise and provide better protection for the packaging contents; high adsorption: the synthetic porous calcium silicate has excellent adsorption performance, which can adsorb harmful gases and odors, and improve the environmental protection and safety of the packaging sheet.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A system for preparing modified polyethylene packaging sheet for steel coil packaging, characterized in that: It comprises a high-speed mixer (1) and a detection device arranged on the high-speed mixer (1); The detection device includes a sampling mechanism for taking materials, a testing mechanism for measuring whether the materials contain water, and a review mechanism for further testing whether the materials contain water. The testing mechanism comprises a testing tube (2), a pushing plate (3) for pushing materials, a pushing member (4) for controlling the movement of the pushing plate (3), an identification component for identifying whether water is present in the materials, and a cleaning component for cleaning water in the testing tube (2); The test tube (2) is used to receive the sample extracted by the sampling mechanism and is installed at the bottom of the high-speed mixer (1), and the pushing plate (3) pushes the material in the test tube (2).

2. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 1, characterized in that: The identification component comprises a filter (5), a test paper (6) that moves in contact with the bottom wall of the filter (5), a color sensor (7), a plurality of guide rollers (8) for contacting the test paper (6) with the bottom of the filter (5), and a winding component for winding the test paper (6); the test tube (2) is provided with a filter hole (9); the filter (5) is installed at the position of the filter hole (9); the color sensor (7) identifies the state in which the test paper (6) turns red when in contact with water; and the color sensor (7) is electrically connected to a buzzer (10).

3. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 2, characterized in that: The winding assembly comprises a plurality of winding ropes (11), a plurality of silicone sheets (13), two winding rollers (12) and two winding motors. The winding rollers (12) rotate at the bottom of the outer wall of the test tube (2). The winding motor is used to control the rotation of the winding rollers (12). The test papers (6) are arranged in plurality. The plurality of winding ropes (11), the plurality of silicone sheets and the plurality of test papers (6) are arranged at intervals. The silicone sheet (13) is also fixed between the two winding ropes (11). The silicone sheet (13) is used to absorb water flowing out of the filter screen (5).

4. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 3, characterized in that: The cleaning component comprises a heating element (14) for heating and drying the test tube (2) and a viewing portion for marking whether the test tube (2) is dried. The high-speed mixer (1) is provided with a heating chamber (15) on the upper part of the test tube (2), and the heating element (14) is arranged in the heating chamber (15).

5. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 4, characterized in that: The inspection portion comprises an inspection block (16) slidably arranged in the test tube (2), a power group for controlling the movement of the inspection block (16), a sponge block (17) for wiping the inside of the test tube (2), and a reaction piece (18) for reacting to whether there is water on the inner wall of the test tube (2); the inspection block (16) is provided with two annular grooves (19) on its outer wall; the sponge block (17) and the reaction piece (18) are respectively installed in the two annular grooves (19); the test tube (2) is also provided with a trigger piece (20) at an initial position for identifying whether the reaction piece (18) reacts; the inspection block (16) is slidably adapted to the test tube (2).

6. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 5, characterized in that: The power group comprises two guide rails (21) and a sliding rod (22). The two guide rails (21) are respectively fixed in the test tube (2) and are symmetrically arranged relative to the central axis of the test tube (2). The two ends of the sliding rod (22) are respectively sleeved on the two guide rails (21). The sliding rod (22) is fixedly connected to the viewing block (16). The viewing block (16) is also slidably sleeved on the two guide rails (21). The viewing block (16) is made of insulating material.

7. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 5, characterized in that: The sampling mechanism comprises a sampling plate (23), a driving member (24), a loosening rod (25), a first rack (26), a second rack (27) and a gear (28); the high-speed mixer (1) is provided with a sampling port (29) at the bottom; the sampling port (29) is connected to the test tube (2) and the length directions are perpendicular to each other; the sampling plate (23) slides in the sampling port (29); the driving member (24) controls the reciprocating motion of the sampling plate (23); the high-speed mixer (1) ) The bottom wall is provided with an operating cavity, the first rack (26) and the second rack (27) both slide in the operating cavity, the gear (28) rotates in the operating cavity, the first rack (26) and the second rack (27) are respectively located on both sides of the gear (28), the loosening rod (25) passes through the operating cavity and moves into the sampling port (29) and is located above the sampling plate (23), and the first rack (26) is fixedly connected to the end of the sampling plate (23).

8. The system for preparing the modified polyethylene packaging sheet for steel coil packaging according to claim 7, characterized in that: The review mechanism comprises a review tube (30), a drying plate (31), a drying member (32) arranged in the drying plate (31), an electromagnet (33), a lifting plate (34), a gravity sensor (35), a lifting member (38) and a feeding plate (36) for returning the material to the high-speed mixer (1); the test tube (2) is provided with a review port (37); both ends of the review tube (30) are open and inclined; one end of the review tube (30) is in contact with the test tube (2); The test tube (2) is connected, and the other end is directly opposite to the top of the drying plate (31); the gravity sensor (35) is used to connect the electromagnet (33) and the lifting plate (34); the electromagnet (33) adsorbs the drying plate (31); the lifting member (38) lifts the lifting plate (34); the feeding plate (36) is slidably arranged on the top side wall of the high-speed mixer (1); the movement direction of the feeding plate (36) is perpendicular to the movement direction of the lifting plate (34).

9. A method for preparing a modified polyethylene packaging sheet for steel coil packaging, based on the system for preparing a modified polyethylene packaging sheet for steel coil packaging according to any one of claims 1 to 8, characterized in that: The steps include: S1. Synthetic porous calcium silicate modified powder: firstly, the porous calcium silicate powder is dried, and the drying quality is detected by a detection device, the weakening of the nucleation ability and the antioxidant performance of the synthetic porous calcium silicate powder are improved, the surface of the synthetic porous calcium silicate powder is modified by a silane coupling agent, the surface of the surface-modified synthetic porous calcium silicate powder is self-assembled, and the surface of the surface-modified synthetic porous calcium silicate powder is self-assembled; S2. Preparation of synthetic porous calcium silicate modified powder filled polyethylene granules: the synthetic porous calcium silicate modified powder obtained in step 1 is mixed according to the following mass percentages: 50-90% polyethylene and 10-50% synthetic porous calcium silicate modified powder; the mixture is placed in a high-speed mixer (1) for mixing at a mixing temperature of 80° C. After mixing for 30 minutes, the mixture of polyethylene and synthetic porous calcium silicate modified powder is taken out and melt-plasticized in the first stage of a hot-cut two-stage extruder and formed and granulated in the second stage to obtain synthetic porous calcium silicate modified powder filled polyethylene granules; S3. Preparation of synthetic porous calcium silicate modified powder-filled polyethylene packaging board: Put the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 into a board forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging board.

10. A modified polyethylene packaging sheet for steel coil packaging, characterized in that: The modified polyethylene packaging sheet for steel coil packaging is prepared by the preparation method of claim 9.

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