Modified polyethylene packaging sheet for steel coil packaging and preparation system and method thereof

Abstract

The present application discloses a modified polyethylene packaging sheet for steel coil packaging and its preparation system and preparation method, which includes a high-speed mixer and a detection device; the detection device includes a sampling mechanism, a testing mechanism and a review mechanism; the testing mechanism includes a test tube, a pushing plate for pushing the material, a pushing member for controlling the movement of the pushing plate, an identification component for identifying whether water has escaped from the material, and a cleaning component for cleaning the water in the test 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. The present application has the effect of detecting whether the porous calcium silicate modified powder is dried, and the obtained polyethylene packaging sheet has the advantages of low density, high strength and good thermal insulation 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, common filling materials for 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 / cm3 and a mesh size 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 its construction difficulty in actual application, and limit the application volume 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 board, which belongs to the field of packaging board processing technology. The preparation method uses synthetic porous calcium silicate powder as the main material, and prepares it into synthetic porous calcium silicate modified powder after drying, weakening the nucleation ability and improving the antioxidant performance, surface silane coupling agent modification, surface self-assembly, and lubrication modification. The synthetic porous calcium silicate modified powder and polyethylene are then prepared into synthetic porous calcium silicate modified powder filled polyethylene packaging board through a hot-cut double-stage extruder and a board forming extruder production line. The synthetic porous calcium silicate modified powder filled polyethylene packaging board 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] Regarding the above-mentioned related technologies, the inventors believe that there are the following defects: during the drying process of the porous calcium silicate modified powder, there is no process for detecting the moisture 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:

[0007] A system for preparing modified polyethylene packaging sheets for steel coil packaging, comprising a high-speed mixer and a detection device arranged on the high-speed mixer;

[0008] 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 retesting whether the materials contain water;

[0009] The testing mechanism includes a testing tube, a pushing plate for pushing the material, a pushing member for controlling the movement of the pushing plate, an identification component for identifying whether water has emerged from the material, and a cleaning component for cleaning the water in the testing tube;

[0010] 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. The pushing plate pushes the material in the test tube.

[0011] 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 component for winding the test paper. The test tube is provided with a filter hole, the filter is installed at the position of the filter hole, the color sensor identifies the state of the test paper turning red when it comes into contact with water, and the color sensor is electrically connected to a buzzer.

[0012] 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 motors are used to control the rotation of the winding rollers. The test papers are provided in plurality. The multiple winding ropes, multiple silicone sheets and multiple test papers are spaced apart. The silicone sheet is also fixed between the two winding ropes. The silicone sheet is used to adsorb water flowing out of the filter.

[0013] 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 on the upper part of the test tube, and the heating element is provided in the heating chamber.

[0014] Optionally, the viewing portion 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.

[0015] 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 sleeved on the two guide rails, the sliding rod is fixedly connected to the viewing block, and the viewing block is also slidably sleeved on the two guide rails, and the viewing block is made of insulating material.

[0016] 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.

[0017] 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 facing 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.

[0018] The present application provides a method for preparing a modified polyethylene packaging sheet for steel coil packaging using the following technical solution:

[0019] A method for preparing a modified polyethylene packaging sheet for steel coil packaging comprises the following steps:

[0020] S1. Synthesizing modified porous calcium silicate powder: first, drying the porous calcium silicate powder, and detecting the drying quality by a detection device, improving the weakening of the nucleation ability and the antioxidant performance of the synthesized porous calcium silicate powder, modifying the surface of the synthesized porous calcium silicate powder with a silane coupling agent, and surface self-assembly of the surface-modified synthetic porous calcium silicate powder;

[0021] 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 and mixed 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;

[0022] S3. Preparation of synthetic porous calcium silicate modified powder-filled polyethylene packaging sheet: The synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 are placed into a sheet forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging sheet.

[0023] The modified polyethylene packaging sheet for steel coil packaging provided in this application adopts the following technical solution:

[0024] 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.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. Low density: Due to the high porosity of synthetic porous calcium silicate, the filled polyethylene packaging sheet has a low density, which helps reduce material weight and lower transportation and storage costs. High strength: The modified calcium silicate powder has a strong bond with the polyethylene substrate, significantly improving the tensile strength, flexural strength, and impact strength of the sheet, enabling it to withstand greater external forces without being easily damaged. Thermal insulation: The porous structure gives synthetic porous calcium silicate excellent thermal insulation properties. When filled into polyethylene sheet, it can enhance the thermal insulation effect of the sheet, making it suitable for packaging scenarios with strict temperature control requirements. Sound insulation: The porous structure also gives the sheet excellent sound insulation properties, effectively isolating external noise and providing better protection for the package contents. High adsorption: Synthetic porous calcium silicate has excellent adsorption properties, which can absorb harmful gases and odors, improving the environmental friendliness and safety of the packaging sheet.

[0027] 2. The two guide rails are connected to power supplies with opposite positive and negative poles. In this embodiment, the positive and negative power supplies are connected to the same end of the two guide rails, and then another positive and negative power supply is connected to the other end of the guide rails. The two ends of the same guide rail are connected to power supplies with different poles, so that the slide bar can move back and forth. Turn on a power supply to make the current flow on the two guide rails and the slide bar. The two guide rails, the slide bar 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 and the slide bar close to the energized power supply can be obtained. Then, according to the left-hand rule, the slider is affected by 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 energized, 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 wipes the inner wall of the test tube to prevent impurities from affecting the normal reaction of the reaction piece. The reaction piece fits the inner wall of the test tube. When the inspection block needs to return to its 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 is toward the direction away from the push plate, and the reaction piece is detected by the trigger piece. If the reaction piece changes color, the test tube needs to be further dried.

[0028] 3. When the test paper does not detect moisture in the material, it is necessary to recheck. 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 a PLC controller and connected to a display screen. At this time, the weight of the drying plate and the material is recorded. The drying plate is returned to its initial position. The drying element can be a heating wire. The heating wire begins 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

[0029] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present application;

[0030] Figure 2 is a schematic diagram of the detection device in Example 1 of the present application;

[0031] Figure 3 yes Figure 2 A magnified schematic diagram of part A;

[0032] Figure 4 is a schematic diagram of the power group in Example 1 of the present application;

[0033] Figure 5 This is a schematic diagram of the winding rope, silicone sheet and test paper in Example 1 of the present application.

[0034] Figure numerals: 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 element; 15, heating chamber; 16, inspection block; 17, sponge block; 18, reaction member; 19, ring groove; 20, trigger member; 21, guide rail; 22, slide bar; 23, sampling plate; 24, driving member; 25, loosening rod; 26, first rack; 27, second rack; 28, gear; 29, sampling port; 30, review tube; 31, drying plate; 32, drying member; 33, electromagnet; 34, lifting plate; 35, gravity sensor; 36, feeding plate; 37, review port; 38, lifting member. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-5 This application is described in further detail.

[0036] Example 1

[0037] The present application embodiment discloses a system for preparing a modified polyethylene packaging sheet for steel coil packaging. Figure 1-Figure 2 A system for preparing modified polyethylene packaging sheets for steel coil packaging includes a high-speed mixer 1 and a detection device provided 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 verification mechanism for further re-testing whether the materials contain water; the testing mechanism includes a test tube 2, a pushing plate 3 for pushing the materials, a pushing member 4 for controlling the movement of the pushing plate 3, an identification component for identifying whether water has emerged in the materials, and a cleaning component for cleaning water in the test tube 2; first, the cleaning component cleans the inner wall of the test tube 2 to ensure that the test tube 2 is in a dry state before sampling to avoid affecting the drying detection accuracy of the test tube 2; when the testing mechanism completes the test, the pushing plate 3 squeezes the sample; if the sample still does not squeeze out water, it needs to enter the verification mechanism for further verification to ensure the detection accuracy; if the verification result still indicates that there is water in the sample, it proves that the sample is not dried and the high-speed mixer 1 needs to continue drying the material.

[0038] 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 adapted to slide with 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 movement 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, and 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 space for passing through the loosening rod 25. The through hole is connected to the operating chamber and the sampling port 29, and the loose rod 25 is adapted to slide with the through hole, so that the material will not enter the operating chamber 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 chamber, 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 a sample In order to prevent the material from piling up or even clumping on the sampling plate 23, the sampling plate 23 is reciprocated multiple times, and it is necessary 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.

[0039] 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 contacting the test paper 6 with the bottom of the filter screen 5, and a winding assembly for winding the test paper 6. A filter hole 9 is provided at a position near the partition plate of the pipeline. The test paper 6 is cobaltous 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. Alternatively, in this embodiment, the filter screen 5 can be replaced with other hard materials for filtering water. The axial direction of the guide roller 8 is arranged 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 by a PLC controller. The color sensor 7 is installed at either end of the filter hole 9 and faces the test paper 6.

[0040] Reference Figure 2-Figure 5 The winding assembly includes multiple winding ropes 11, multiple 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 axis direction of the winding roller 12 is parallel to the axis 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 multiple, and the multiple winding ropes 11, multiple silicones and multiple 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 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 this order. 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 5, and the area of ​​the test paper 6 is larger than that of the filter 5.

[0041] 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. At this time, if there is moisture on the inner wall of the test tube 2, 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 5. At this time, the water vapor is adsorbed by the silicone sheet 13, thereby reducing the residual water vapor in the test tube 2 to a minimum to avoid affecting the material detection.

[0042] Reference Figure 2-Figure 3The inspection unit includes an inspection block 16 that is slidably disposed within 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 member 18 for detecting 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. 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 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 that 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 onto the test paper 6. After a period of squeezing, 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 sound, it proves that there is moisture in the material and the material needs to be further dried.

[0043] Reference Figure 2-Figure 4 , the inspection block 16 is provided with two annular grooves 19 on its outer wall, and the annular groove 19 is set as a circle. The sponge block 17 and the reaction member 18 are respectively fixed in the two annular grooves 19. The sponge block 17 and the reaction member 18 are glued in the annular groove 19. In this embodiment, the reaction member 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. One end of the test tube 2 can be fixed with a bolt, 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 is doubt about the results of multiple tests that the test tube 2 needs to be checked. The detection of whether there is moisture is performed, so the frequency of use of the reaction element 18 is not high, and the workload of the staff will not be increased. In addition, in this embodiment, it is determined that the test tube 2 is further provided with a trigger element 20 at the initial position for identifying whether the reaction element 18 has reacted. The trigger element 20 also adopts a color sensor 7. The trigger element 20 is convenient for triggering the state of the reaction element 18 after the reaction. The trigger element 20 can also be controlled by a PLC controller and connected to a display light. In this embodiment, it is assumed that if one side of the reaction element 18 changes color, moisture will also exist in other positions of other test tubes 2. Therefore, the color sensor 7 only needs to identify any side and can accurately identify whether there is moisture in the test tube 2.

[0044] 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, and the viewing block 16 is also slidably sleeved on the two guide rails 21. The viewing block 16 is made of insulating material, and 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, and the same push plate 3 is also slidably adapted to the two guide rails 21; the 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 rails 21, and 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 realize reciprocating motion, turn on a power supply, so that current flows on the two guide rails 21 and the slide bar 22, and the two The guide rail 21, slide bar 22, and external DC power supply form a closed circuit. Based on the direction of current flow and Ampere's law, the direction of the magnetic flux lines within the range of the two guide rails 21 and slide bar 22 close to the energized power supply can be determined. Then, using the left-hand rule, the direction of the Ampere force acting on the slide bar 22 is parallel to the guide rail 21 and toward 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 along 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 is in contact with the inner wall of the test tube 2. When it is necessary to return the inspection block 16 to its initial position, this power source can be turned off and another power source can be turned on. At this time, the direction of movement of the slide bar 22 is away from the push plate 3. The trigger member 20 detects the reaction member 18. If the reaction member 18 changes color, the test tube 2 needs to be further dried.

[0045] Reference Figure 2-Figure 3, and when the test paper 6 does not detect that the material has moisture squeezed out, it is necessary to review again. The review mechanism includes 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 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 review port 37. Both ends of the review port 37 are open and clearly set. One end of the review tube 30 is connected to the test tube 2, and the position where the review tube 30 is connected to the test tube 2 is close to the viewing block 16. In this embodiment, a control board is provided at the top position of the review tube 30. The control board moves back and forth through the 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 is set to be concave 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.

[0046] 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 a PLC controller and is 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 returned to its initial position. The drying member 32 can be selected from a heating wire, and 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 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 provided 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.

[0047] 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 slide bar 22 can be reciprocated. Turn on a power supply so that current flows on the two guide rails 21 and the slide bar 22. The two guide rails 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, and then By the left-hand rule, it can be obtained that the direction of the Ampere force exerted 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 return the inspection block 16 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. 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.

[0048] 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.

[0049] When the test paper 6 does not detect moisture squeezed out of the material, it is necessary to review 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 a PLC controller and is 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 returned to its 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.

[0050] Example 2

[0051] The present application 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:

[0052] S1. Synthetic porous calcium silicate modified powder: First, dry the porous calcium silicate powder and detect the drying quality through a detection device. The presence of moisture in the material is determined by whether the test paper 6 changes color. If the test paper 6 does not change color, the weight needs to be rechecked. 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 be dried further; improve the weakening of the nucleation ability and antioxidant properties 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 through 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 surface modified synthetic porous calcium silicate powder of surface self-assembled titanate coupling agent and aluminate coupling agent is reduced to 80-100 ° C, completing the primary surface self-assembly of the surface modified synthetic porous calcium silicate powder, and then adding 0.5-2% by mass of rare earth coupling agent HY-041 to the calcium silicate powder that has completed the primary surface self-assembly to perform secondary self-assembly, after 5-15 minutes of secondary self-assembly, the surface self-assembled synthetic porous calcium silicate powder is obtained; lubrication modification of the surface self-assembled synthetic porous calcium silicate powder;

[0053] 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;

[0054] S3. Preparation of synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets: the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 are placed into a sheet forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets, and the synthetic porous calcium silicate modified powder-filled polyethylene granules obtained in step 2 are placed into a sheet forming extruder production line to prepare synthetic porous calcium silicate modified powder-filled polyethylene packaging sheets, wherein the aspect ratio of the sheet forming extruder unit is 35:1, the extrusion speed is 80-105 rpm, the forming mold is a hanger-type parallel mold, and the temperatures of the 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.

[0055] Example 3

[0056] 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 filling it into the polyethylene sheet, it can improve the thermal insulation effect of the sheet 34, and is suitable for packaging scenarios with high temperature control requirements; 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, can adsorb harmful gases and odors, and improve the environmental protection and safety of the packaging sheet.

[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A system for preparing modified polyethylene packaging sheets for steel coil packaging, characterized in that : comprising a high-speed mixer (1) and a detection device arranged on the high-speed mixer (1); The detection device comprises a sampling mechanism for taking materials, a testing mechanism for measuring whether the materials contain water, and a review mechanism for further retesting whether the materials contain water; the testing mechanism comprises a test tube (2), a pushing plate (3) for pushing the materials, a pushing member (4) for controlling the movement of the pushing plate (3), an identification component for identifying whether water has emerged in the materials, and a cleaning component for cleaning the water in the test 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); 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 it comes into contact with water; and the color sensor (7) is electrically connected to a buzzer (10); The cleaning assembly 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); the viewing portion comprises a viewing block (16) slidably arranged in the test tube (2), a power group for controlling the movement of the viewing block (16), and a viewing unit for marking the test tube (2). 2) a sponge block (17) for wiping the inner wall of the test tube (2) and a reaction piece (18) for detecting whether there is water on the inner wall of the test tube (2); the viewing 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 further provided with a trigger piece (20) for identifying whether the reaction piece (18) reacts at an initial position; the viewing block (16) is slidably adapted to the test tube (2); The power group includes two guide rails (21) and a slide rod (22). The two guide rails (21) are respectively fixed in the test tube (2) and symmetrically arranged relative to the central axis of the test tube (2). The two ends of the slide rod (22) are respectively sleeved on the two guide rails (21). The slide 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. 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 opened 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 facing 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), and 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), and the movement direction of the feeding plate (36) is perpendicular to the movement direction of the lifting plate (34).

2. The system for preparing modified polyethylene packaging sheet for steel coil packaging according to claim 1, 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 provided in plurality. The plurality of winding ropes (11), the plurality of silicone sheets (13) 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).

3. The system for preparing modified polyethylene packaging sheet for steel coil packaging according to claim 2, 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) ) An operating cavity is provided on the bottom wall, 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).

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