Stretch film production equipment and preparation method thereof

Abstract

The present application relates to a stretch film production device and a preparation method thereof, belonging to the technical field of stretch film production. The stretch film production device includes an extrusion tube and a casting machine, the extrusion tube being connected to the casting machine. A first filter screen is slidingly provided on the side of the extrusion tube near the casting machine, the sliding direction of the first filter screen being perpendicular to the plane of the first filter screen. A reset member is provided within the extrusion tube for pushing the first filter screen to slide away from the casting machine. A second filter screen is slidingly provided on the side of the first filter screen near the casting machine, the sliding direction of the second filter screen being parallel to the plane of the first filter screen. The second filter screen abuts the feed port of the casting machine. A transmission assembly is provided within the extrusion tube for causing the sliding of the second filter screen when the first filter screen slides. The present application has the effect of improving the thickness of the formed film to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of stretch film production, and in particular to a stretch film production device and a preparation method thereof. Background Art

[0002] Stretch film, also known as stretch film or heat shrink film, is used for wrapping objects and is widely used in industries such as food, agricultural products, and building materials. Stretch film leverages its exceptional wrapping strength and retractability to compactly and securely bundle products into a single unit.

[0003] The production and processing method for stretch film primarily includes raw material preparation, melting in an extruder, tape casting, static elimination of the stretch film, and winding. In related technologies, an extrusion tube connects the hot-melt extruder and the tape casting machine. A filter is installed on the side of the extrusion tube closest to the tape casting machine, abutting the inlet of the tape casting machine. During operation, the hot-melt extruder pushes the melted slurry into the extrusion tube. Rotating blades within the extrusion tube push the slurry through the filter before it enters the tape casting machine, where it is shaped.

[0004] Regarding the above-mentioned related technologies, when the filter is used for a long time, the debris or incompletely melted raw materials adhering to the filter are easily squeezed into the casting machine together with the hot melt adhesive, making the thickness of the final formed film large. Summary of the Invention

[0005] In order to prevent debris or incompletely melted raw materials from being squeezed into the casting machine along with the hot melt adhesive and to improve the thickness of the molded film to a certain extent, the present application provides a stretch film production device and a preparation method thereof.

[0006] In the first aspect, the present application provides a stretch film production device that adopts the following technical solutions:

[0007] A stretch film production device includes an extrusion tube and a casting machine, the extrusion tube is connected to the casting machine, and a first filter screen is slidingly provided on the side of the extrusion tube close to the casting machine, and the sliding direction of the first filter screen is perpendicular to the plane where the first filter screen is located. A reset part is provided in the extrusion tube for pushing the first filter screen to slide in a direction away from the casting machine, and a second filter screen is slidingly provided on the side of the first filter screen close to the casting machine, and the sliding direction of the second filter screen is parallel to the plane where the first filter screen is located. The second filter screen abuts against the feed port of the casting machine, and a transmission component is provided in the extrusion tube for driving the second filter screen to slide when the first filter screen slides. When the first filter screen slides in the direction close to the casting machine, the second filter screen drives the corresponding filter holes to slide in the direction away from the filter holes on the first filter screen.

[0008] By adopting the above technical solution, when there is debris or incompletely melted raw materials adhering to the first filter screen, the debris or incompletely melted raw materials have a thrust on the first filter screen toward the casting machine under the squeezing of the spiral blades in the extrusion tube, pushing the first filter screen to slide a certain distance toward the casting machine, and the second filter screen is driven to slide on the first filter screen through the transmission component, and the second filter screen drives the corresponding filter holes to move a certain distance in the direction away from the filter holes on the first filter screen, thereby blocking part of the filter holes on the first filter screen, reducing the passage space for debris or incompletely melted raw materials, making it difficult for debris or incompletely melted raw materials to be squeezed into the casting machine with the hot melt adhesive, and improving the thickness of the molded film to a certain extent.

[0009] Preferably, the transmission assembly includes a protrusion arranged on the second filter screen, an abutment block arranged in the extrusion tube and a first pulling member arranged on the first filter screen, the side of the protrusion close to the casting machine is an arc surface, and the side of the arc surface away from the second filter screen is inclined toward the direction away from the casting machine, the abutment block is located on the side of the protrusion close to the casting machine, the abutment block is used to slide relative to the arc surface of the protrusion, and the first pulling member is used to pull the second filter screen to slide toward the direction close to the abutment block.

[0010] By adopting the above technical solution, when the first filter screen drives the second filter screen to slide toward the direction close to the casting machine, the arc surface of the abutment block and the protrusion slide relative to each other. At this time, the abutment block will push the protrusion to drive the second filter screen to slide in the direction away from the abutment block, so that the second filter screen drives the corresponding filter holes away from the filter holes on the first filter screen, thereby reducing the space through which debris or incompletely melted raw materials can pass, making it difficult for debris or incompletely melted raw materials to be squeezed into the casting machine with the hot melt adhesive, thereby reducing the thickness of the molded film to a certain extent.

[0011] Preferably, the first pulling member includes a first tension spring for pulling the second filter screen to slide toward the direction close to the abutment block, one end of the first tension spring is arranged on the first filter screen, and the other end is arranged on the second filter screen.

[0012] By adopting the above technical solution, the first tension spring pulls the second filter screen to slide in the direction close to the abutment block, which helps to reset the second filter screen and facilitates the passage of molten slurry.

[0013] Preferably, the reset member includes a spring for pushing the first filter screen to slide in a direction away from the casting machine, one end of the spring is arranged in the extrusion tube, and the other end is arranged on the first filter screen.

[0014] By adopting the above technical solution, after the debris adhering to the first filter screen is removed, the first filter screen is pushed by the spring to slide in a direction away from the casting machine, which helps the first filter screen to be reset and is convenient for continued use.

[0015] Preferably, a slide is slidingly provided in the extrusion tube, the slide is located on the side of the first filter away from the casting machine, the sliding direction of the slide is parallel to the plane where the first filter is located, a plurality of through holes are provided on the slide, a mounting plate is slidingly provided on the side of the slide close to the first filter, the sliding direction of the mounting plate is perpendicular to the plane where the first filter is located, a plurality of scraping needles are provided on the side of the mounting plate close to the first filter, the scraping needles are used to abut against the first filter, a driving member for driving the slide to slide is provided in the extrusion tube, and an adjusting component for adjusting the mounting plate to slide toward or away from the first filter is provided in the slide.

[0016] By adopting the above technical solution, the mounting plate is adjusted to slide toward the first filter screen through the adjustment component, so that the scraper needle abuts against the first filter screen, and then the slide is driven by the driving member to drive the scraper needle on the mounting plate to slide on the first filter screen, so that the scraper needle can scrape off the debris or incompletely melted raw materials adhering to the first filter screen, which helps to clean the first filter screen and makes it difficult for debris or incompletely melted raw materials to be squeezed into the casting machine with the hot melt adhesive, thereby ensuring the thickness of the formed film to a certain extent.

[0017] Preferably, the adjustment assembly includes a first telescopic rod provided on the mounting plate, a connecting rod connected to the side of the first telescopic rod away from the mounting plate, a guide groove provided in the extrusion tube and a second pulling member provided in the slide, the sliding direction of the first telescopic rod is provided in the vertical direction, the first telescopic rod is slidably passed through the slide, one end of the connecting rod away from the first telescopic rod is slidably matched with the guide groove, the guide groove is located on the side of the connecting rod away from the casting machine, the guide groove includes a first trough body, a second trough body and a connecting trough body provided in the extrusion tube, the length directions of the first trough body and the second trough body are both parallel to the sliding direction of the slide, the first trough body is located above the second trough body, the connecting trough body is located between the first trough body and the second trough body, one end of the connecting trough body is connected to the first trough body, and the other end is connected to the second trough body, the first trough body, the second trough body and the connecting trough body form a loop, the connecting trough body is arc-shaped and convex in the direction away from the first trough body, the distance from the bottom wall of the second trough body to the casting machine is less than the distance from the bottom wall of the first trough body and the connecting trough body to the casting machine, and the second pulling member is used to pull the mounting plate to slide in the direction away from the first filter screen.

[0018] By adopting the above technical solution, when the connecting rod slides from the connecting trough body into the second trough body, the connecting rod will push the mounting plate to slide toward the direction close to the first filter screen, so that the scraping needle on the mounting plate will abut against the first filter screen, thereby facilitating the scraping of debris or incompletely melted raw materials on the first filter screen; when the connecting rod slides from the second trough body to the connecting trough body and the first trough body, the second pulling member pulls the mounting plate to slide toward the direction away from the first filter screen, so that the scraping needle disengages from the first filter screen, reducing the abutment force on the first filter screen, and facilitating the resetting of the first filter screen.

[0019] Preferably, the second pulling member includes a second tension spring for pulling the mounting plate to slide in a direction away from the first filter screen, one end of the second tension spring is arranged in the slide plate, and the other end is arranged on the mounting plate.

[0020] By adopting the above technical solution, the second tension spring pulls the mounting plate to slide in a direction away from the first filter, so that the scraper needle is separated from the first filter, reducing the abutting force on the first filter, and facilitating the resetting of the first filter.

[0021] Preferably, a slag outlet is provided on one side of the extrusion tube, and the slag outlet corresponds to the position of the slide. A collecting box is connected to the extrusion tube, and the collecting box is communicated with the slag outlet. An opening and closing door for opening and closing the slag outlet is hinged on the collecting box, and the cross-sectional area of the opening and closing door is larger than the cross-sectional area of the slide. A rotating shaft is coaxially arranged on the opening and closing door, and a torsion spring is sleeved on the rotating shaft for driving the opening and closing door to rotate toward the slag outlet. One end of the torsion spring is arranged on the opening and closing door, and the other end is arranged on the collection box. When the slide slides toward the direction close to the collection box, the connecting rod slides in the second trough body.

[0022] By adopting the above technical solution, the slide drives the mounting plate to slide toward the direction close to the collecting box. When the scraper on the slide moves to the position of the opening and closing door, the slide abuts against the opening and closing door, pushing the opening and closing door to rotate in the direction away from the slag outlet, thereby opening the slag outlet, making it easier for the scraper on the mounting plate to push the debris adhering to the first filter screen and the raw materials that are not completely melted into the collecting box, so that the debris or the raw materials that are not completely melted are not easily squeezed into the casting machine with the hot melt adhesive, thereby ensuring the thickness of the formed film to a certain extent and helping to reduce the thickness of the formed film.

[0023] Preferably, a push rod for abutting against the opening and closing door is provided on one side of the slide close to the collection box.

[0024] By adopting the above technical solution, the push rod is arranged to abut against the opening and closing door to open the slag outlet, thereby pushing debris or incompletely melted raw materials into the collection box, which helps to ensure the thickness of the formed film.

[0025] In a second aspect, the present application provides a method for preparing a stretch film using the following technical solutions:

[0026] A method for preparing a stretch film, using the stretch film production equipment, further comprising the following steps:

[0027] Step 1: Prepare the raw materials;

[0028] Step 2: Put the mixed raw materials into the extruder for hot melting;

[0029] Step 3: The extruder squeezes the molten slurry into the extrusion tube, and the slurry is filtered through the first filter screen in the extrusion tube;

[0030] Step 4: When impurities or incompletely melted raw materials adhere to the first filter screen, and the slurry passes through the impurities or incompletely melted raw materials and pushes the first filter screen to slide toward the casting machine, the transmission assembly drives the second filter screen to slide a certain distance, blocking part of the filter holes on the first filter screen, thereby reducing the space for impurities or incompletely melted raw materials to pass through;

[0031] Step 5: The molten slurry passing through the first filter screen and the second filter screen enters the tape casting machine for molding;

[0032] Step 6: Roll up.

[0033] In summary, this application has the following beneficial technical effects:

[0034] When there is debris or incompletely melted raw material adhering to the first filter screen, the spiral blades in the extrusion tube push the debris or incompletely melted raw material to exert a thrust on the first filter screen toward the casting machine, pushing the first filter screen to slide a certain distance toward the casting machine, and the second filter screen is driven to slide on the first filter screen through the transmission component, and the second filter screen drives the corresponding filter holes to move a certain distance in the direction away from the filter holes on the first filter screen, thereby blocking part of the filter holes on the first filter screen, reducing the passage space for debris or incompletely melted raw material, and making it difficult for debris or incompletely melted raw material to be squeezed into the casting machine with the hot melt adhesive, thereby improving the thickness of the molded film to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0036] Figure 2 It is a partial structural cross-sectional view of an embodiment of the present application.

[0037] Figure 3 It is a partial structural exploded view of an embodiment of the present application.

[0038] Figure 4 yes Figure 3 Enlarged view of part A.

[0039] Figure 5It is a partial structural cross-sectional view of an embodiment of the present application.

[0040] Figure 6 yes Figure 5 Magnified view of part B.

[0041] Explanation of reference numerals: 1, extrusion tube; 2, casting machine; 3, first filter screen; 4, second filter screen; 5, transmission assembly; 51, protrusion; 52, abutment block; 53, first pulling member; 531, first tension spring; 6, spring; 7, slide plate; 8, through hole; 9, mounting plate; 10, scraper needle; 11, adjustment assembly; 111, first telescopic rod; 112, connecting rod; 113, guide groove; 1131, first trough body; 1132, second trough body; 1133, connecting trough body; 1 14. Second pulling member; 1141. Second tension spring; 12. Slag outlet; 13. Collecting box; 14. Opening and closing door; 15. Rotating shaft; 16. Torsion spring; 17. Push rod; 18. First slider; 19. First slide groove; 20. Second slider; 21. Second slide groove; 22. Cavity; 23. Mounting groove; 24. Rodless hydraulic cylinder; 25. Mounting block; 26. Connecting block; 27. Connecting cavity; 28. Second telescopic rod; 29. Pressure sensor; 30. Magnet; 31. Iron sheet. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-6 This application is described in further detail.

[0043] The embodiment of the present application discloses a stretch film production device. Figure 1 and Figure 2 The stretch film production equipment includes an extrusion tube 1 and a casting machine 2. The extrusion tube 1 is connected to the casting machine 2. The longitudinal cross-section of the extrusion tube 1 is square. A first filter screen 3 is slidingly provided on the side of the extrusion tube 1 close to the casting machine 2. The sliding direction of the first filter screen 3 is perpendicular to the plane where the first filter screen 3 is located. First sliders 18 are fixed on the opposite sides of the first filter screen 3. A first slide groove 19 that slides with the first slider 18 is provided on the inner wall of the extrusion tube 1. A reset member for pushing the first filter screen 3 to slide in a direction away from the casting machine 2 is provided in the extrusion tube 1. The reset member includes a spring 6 for pushing the first filter screen 3 to slide in a direction away from the casting machine 2. The extension direction of the spring 6 is parallel to the sliding direction of the first filter screen 3. One end of the spring 6 is fixedly connected to the inner wall of the first slide groove 19, and the other end is fixedly connected to the side of the first slider 18 close to the casting machine 2.

[0044] Reference Figure 1 and Figure 3 A second filter screen 4 is slidingly arranged on the side of the first filter screen 3 close to the casting machine 2. The sliding direction of the second filter screen 4 is parallel to the plane where the first filter screen 3 is located. The sliding direction of the second filter screen 4 is arranged in the horizontal direction. The second filter screen 4 is in contact with the feed port of the casting machine 2.

[0045] Reference Figure 3 and Figure 4 , a second slider 20 is fixed to the side of the second filter screen 4 close to the first filter screen 3, and the longitudinal section of the second slider 20 is T-shaped. A second chute 21 that slides with the second slider 20 is provided on the side of the first filter screen 3 close to the second filter screen 4, so that the second slider 20 is not easily separated from the second chute 21; the sliding cooperation between the second slider 20 and the second chute 21 helps to improve the sliding effect of the second filter screen 4; a transmission component 5 is provided in the extrusion tube 1 for driving the second filter screen 4 to slide when the first filter screen 3 slides. When the first filter screen 3 is toward the casting machine 2 (refer to Figure 1 ), the second filter screen 4 drives the corresponding filter holes to slide in a direction away from the filter holes on the first filter screen 3.

[0046] When there is debris or incompletely melted raw material adhering to the first filter screen 3, the spiral blades in the extrusion tube 1 continuously push the slurry through the first filter screen 3. Since the debris and incompletely melted raw material cannot pass through the first filter screen 3 smoothly, a certain thrust is exerted on the first filter screen 3, causing the first filter screen 3 to drive the second filter screen 4 to slide toward the direction close to the casting machine 2, compressing the spring 6. At this time, the transmission component 5 drives the second filter screen 4 to slide a certain distance in the horizontal direction, so that the filter holes on the second filter screen 4 are away from the filter holes on the first filter screen 3, thereby reducing the space through which the slurry can pass, and making it difficult for debris or incompletely melted raw material to be squeezed into the casting machine 2 with the hot melt adhesive, thereby ensuring to a certain extent that the thickness of the formed film is not too thick.

[0047] Reference Figure 1 and Figure 2 In order to facilitate the sliding of the second filter screen 4, the transmission assembly 5 includes a protrusion 51 fixedly connected to one side of the second filter screen 4, an abutment block 52 fixedly connected to the first slide groove 19 on one side, and a first pulling member 53 arranged on the first filter screen 3. The protrusion 51 is located in the first slide groove 19 close to the side of the abutment block 52. The side of the protrusion 51 close to the casting machine 2 is an arc surface, and the side of the arc surface away from the second filter screen 4 is inclined toward the direction away from the casting machine 2. The abutment block 52 is located on the side of the protrusion 51 close to the casting machine 2. The abutment block 52 is used to slide relative to the arc surface of the protrusion 51, and the first pulling member 53 is used to pull the second filter screen 4 to slide in the direction close to the abutment block 52.

[0048] Reference Figure 3 and Figure 4The first pulling member 53 includes a first tension spring 531 for pulling the second filter screen 4 to slide toward the direction close to the abutment block 52. The extension direction of the first tension spring 531 is parallel to the sliding direction of the second filter screen 4. One end of the first tension spring 531 is fixedly connected to the side of the second slide groove 21 close to the protrusion 51, and the other end is fixedly connected to the side of the second slider 20 close to the protrusion 51.

[0049] When there is no debris or incompletely melted raw material adhering to the first filter screen 3, the filter holes of the first filter screen 3 are aligned with the filter holes of the second filter screen 4; when the first filter screen 3 slides toward the direction close to the casting machine 2, it drives the protrusion 51 on the second filter screen 4 to slide toward the direction close to the abutment block 52. At this time, the abutment block 52 and the arc surface of the protrusion 51 slide relative to each other, and push the second filter screen 4 to slide in the direction away from the abutment block 52, so that the first tension spring 531 is stretched, so that the filter holes on the second filter screen 4 are away from the filter holes on the first filter screen 3, thereby reducing the space through which the slurry can pass, and making it difficult for debris or incompletely melted raw material to be squeezed into the casting machine 2 with the hot melt adhesive, thereby ensuring to a certain extent that the thickness of the molded film is not too thick.

[0050] Reference Figure 2 and Figure 5 A slide plate 7 is provided in the extrusion tube 1 for sliding movement. The plane of the slide plate 7 is perpendicular to the plane of the first filter screen 3. The slide plate 7 is located at the first filter screen 3 away from the casting machine 2 (refer to Figure 1 ), the sliding direction of the skateboard 7 is parallel to the plane where the first filter screen 3 is located, and the sliding direction of the skateboard 7 is set in the horizontal direction. A plurality of through holes 8 are provided on the skateboard 7. The diameter of the through hole 8 is equal to the diameter of the filter hole on the first filter screen 3. A cavity 22 is provided in the side of the skateboard 7 close to the first filter screen 3. The longitudinal section of the cavity 22 is L-shaped. A mounting plate 9 is slidably arranged in the cavity 22. The sliding direction of the mounting plate 9 is perpendicular to the plane where the first filter screen 3 is located. A plurality of scraping needles 10 are fixedly connected to the side of the mounting plate 9 close to the first filter screen 3. The plurality of scraping needles 10 are elastic steel needles. The scraping needles 10 are used to abut against the first filter screen 3. The plurality of scraping needles 10 are slidably penetrated on the side of the skateboard 7 close to the first filter screen 3.

[0051] Reference Figure 5 and Figure 6 A driving member for driving the slide 7 to slide is provided in the extrusion tube 1. In this embodiment, a mounting groove 23 is provided on the top wall of the extrusion tube 1. The driving member includes a rodless hydraulic cylinder 24 installed in the mounting groove 23. The extension direction of the rodless hydraulic cylinder 24 is parallel to the sliding direction of the slide 7. A mounting block 25 is fixedly connected to the top wall of the slide 7. The mounting block 25 is fixedly connected to the moving part of the rodless hydraulic cylinder 24. In other embodiments, the driving member can be replaced by a hydraulic cylinder, a pneumatic cylinder, etc.

[0052] Reference Figure 2 and Figure 6, an adjusting assembly 11 is provided in the cavity 22 for adjusting the mounting plate 9 to slide toward or away from the first filter screen 3. The adjusting assembly 11 includes a first telescopic rod 111 fixedly connected to the mounting plate 9 on the side away from the first filter screen 3 through a connecting block 26, a connecting rod 112 connected to the first telescopic rod 111 on the side away from the mounting plate 9, a guide groove 113 provided in the mounting groove 23 and a second pulling member 114 provided in the slide plate 7. The sliding direction of the first telescopic rod 111 is set along the vertical direction, the first telescopic rod 111 is slidably passed through the slide plate 7 and the mounting block 25, and a connecting cavity 27 for the first telescopic rod 111 to move is opened in the top wall of the slide plate 7 and the mounting block 25. The connecting cavity 27 is connected to the cavity 22. The length direction of the connecting rod 112 is parallel to the sliding direction of the mounting plate 9. The connecting rod 112 is movably passed through the mounting block 25. The connecting rod 112 is located on the side of the first telescopic rod 111 away from the mounting plate 9.

[0053] Reference Figure 1 and Figure 6 , one end of the connecting rod 112 away from the first telescopic rod 111 is slidably matched with the guide groove 113, the guide groove 113 is located on the side of the connecting rod 112 away from the casting machine 2, the guide groove 113 includes a first groove body 1131, a second groove body 1132 and a connecting groove body 1133 fixedly installed in the mounting groove 23, the length directions of the first groove body 1131 and the second groove body 1132 are parallel to the sliding direction of the slide 7, the first groove body 1131 is located above the second groove body 1132, and two connecting groove bodies 1133 are provided, and the two connecting groove bodies 1133 are respectively located at the first and second groove bodies 1131 and 1132. At both ends of a trough body 1131, the connecting trough body 1133 is located between the first trough body 1131 and the second trough body 1132. One end of the connecting trough body 1133 is connected to the first trough body 1131, and the other end is connected to the second trough body 1132. The first trough body 1131, the second trough body 1132 and the connecting trough body 1133 form a loop. The connecting trough body 1133 is arc-shaped and convex outward in the direction away from the first trough body 1131. The distance from the bottom wall of the second trough body 1132 to the casting machine 2 is smaller than the distance from the bottom wall of the first trough body 1131 and the connecting trough body 1133 to the casting machine 2.

[0054] Reference Figure 5 and Figure 6The first telescopic rod 111 is fixedly connected to the second telescopic rod 28 on the side away from the mounting plate 9, and the telescopic direction of the second telescopic rod 28 is parallel to the sliding direction of the mounting plate 9. One end of the second telescopic rod 28 is fixed to the side of the first telescopic rod 111 away from the mounting plate 9, and the other end is fixed to the side of the cavity 22 away from the mounting plate 9. The second pulling member 114 is used to pull the mounting plate 9 to slide in the direction away from the first filter screen 3. The second pulling member 114 includes a second tension spring 1141 for pulling the mounting plate 9 to slide in the direction away from the first filter screen 3. The second tension spring 1141 is movably sleeved on the second telescopic rod 28, one end of the second tension spring 1141 is fixedly connected to the inner wall of the cavity 22 away from the mounting plate 9, and the other end is fixedly connected to the side of the first telescopic rod 111 away from the mounting plate 9. The telescopic cooperation of the second telescopic rod 28 helps to improve the sliding effect of the mounting plate 9.

[0055] Reference Figure 1 、 Figure 2 and Figure 4 A slag outlet 12 is provided on one side of the extrusion tube 1, and the slag outlet 12 corresponds to the position of the slide 7. A collecting box 13 is connected to the extrusion tube 1 by bolts. The collecting box 13 is connected to the slag outlet 12. An opening and closing door 14 for opening and closing the slag outlet 12 is hinged on the collecting box 13. The cross-sectional area of the opening and closing door 14 is larger than the cross-sectional area of the slide 7. A rotating shaft 15 is coaxially provided on the opening and closing door 14. The rotating shaft 15 is located on the side of the slag outlet 12 away from the casting machine 2. A torque is provided on the rotating shaft 15 for driving the opening and closing door 14 to rotate toward the direction close to the slag outlet 12. Spring 16, one end of the torsion spring 16 is fixedly connected to the opening and closing door 14, and the other end is fixedly connected to the collecting box 13. The torsion force of the torsion spring 16 is greater than the thrust of the molten slurry on the opening and closing door 14 during operation; the side of the slide 7 close to the slag outlet 12 is fixedly connected with a push rod 17, and the push rod 17 is used to abut against the opening and closing door 14. The push rod 17 is located in the middle of the slide 7; when there are debris or incompletely melted raw materials adhering to the first filter screen 3, when the spring 6 is compressed, the side of the first filter screen 3 away from the second filter screen 4 is flush with the inner wall of the slag outlet 12 close to the casting machine 2. This makes it easy for debris scraped by the scraping needle 10 to enter the collection box 13; when the slide plate 7 slides toward the collection box 13, the connecting rod 112 slides in the second groove 1132; a magnet 30 is embedded in the end of the connecting rod 112 away from the first telescopic rod 111, and an iron sheet 31 for adsorption and cooperation with the magnet 30 is provided on the inner wall of the first groove 1131 close to the slag outlet 12.

[0056] Reference Figure 2 and Figure 4 A pressure sensor 29 is installed on the inner wall of the second chute 21 away from the protrusion 51. The pressure sensor 29 is connected to an external controller, and the rodless hydraulic cylinder 24 is connected to the external controller.

[0057] When the second slider 20 slides in the direction away from the protrusion 51 until it abuts against the pressure sensor 29, the pressure sensor 29 is triggered, and the pressure sensor 29 sends a signal to the controller. At this time, the controller controls the rodless hydraulic cylinder 24 to start and drive the mounting block 25 to drive the slide plate 7 to slide in the direction close to the slag outlet 12. At this time, the connecting rod 112 slides from the connecting groove 1133 on the side away from the slag outlet 12 to the second groove 1132. Since the distance from the bottom wall of the second groove 1132 to the casting machine 2 is smaller than the distance from the bottom wall of the first groove 1131 and the connecting groove 1133 to the casting machine 2, the bottom wall of the second groove 1132 abuts the connecting rod 112, driving the first telescopic rod 111 and the scraping needle 10 on the mounting plate 9 to slide in the direction close to the first filter screen 3, which helps the scraping needle 10 to abut against the first filter screen 3. At this time, the slide plate 7 drives the scraping needle 10 to slide in the direction close to the slag outlet 12, thereby scraping off the debris or incompletely melted raw materials adhering to the first filter screen 3. The opening and closing door 14 abuts, the slide plate 7 continues to slide toward the direction close to the slag outlet 12, and the push rod 17 pushes the opening and closing door 14 to rotate in the direction away from the slag outlet 12, so that the slag outlet 12 is opened, and the scraping needle 10 scrapes the debris into the collection box 13; then the rodless hydraulic cylinder 24 drives the connecting rod 112 to slide from the second groove body 1132 into the connecting groove body 1133, and at the same time, under the adsorption action of the magnet 30 and the iron sheet 31, the connecting rod 112 slides toward the direction close to the first groove body 1131; then The rodless hydraulic cylinder 24 drives the slide plate 7 to slide in the direction away from the slag outlet 12, so that the push rod 17 and the opening and closing door 14 are disengaged, and the torsion spring 16 drives the opening and closing door 14 to close the slag outlet 12. At the same time, the connecting rod 112 slides through the connecting groove body 1133 and the first groove body 1131. Under the pulling action of the second tension spring 1141, the first telescopic rod 111 is pulled to drive the mounting plate 9 to slide in the direction away from the first filter screen 3, thereby reducing the abutment force on the first filter screen 3, making it convenient for the first filter screen 3 to be reset.

[0058] The implementation principle of the embodiment of the present application is as follows: when there is debris or incompletely melted raw material adhering to the first filter screen 3, the spiral blades in the extrusion tube 1 continuously push the slurry through the first filter screen 3. Since the debris and incompletely melted raw material cannot pass through the first filter screen 3 smoothly, a certain thrust is exerted on the first filter screen 3, causing the first filter screen 3 to drive the second filter screen 4 to slide toward the direction close to the casting machine 2, compressing the spring 6, and then driving the protrusion 51 on the second filter screen 4 to slide toward the direction close to the abutment block 52. At this time, the abutment block 52 and the arc surface of the protrusion 51 slide relative to each other, and push the second filter screen 4 and the second slider 20 to slide toward the direction away from the abutment block 52, causing the first tension spring 531 to stretch, thereby realizing that the filter holes on the second filter screen 4 are away from the filter holes on the first filter screen 3, thereby reducing the space through which the slurry can pass, which helps to reduce the thickness of the molded film.

[0059] Then the second slider 20 triggers the pressure sensor 29, and the pressure sensor 29 sends a signal to the controller. At this time, the controller controls the rodless hydraulic cylinder 24 to start and drive the mounting block 25 to drive the slide plate 7 to slide in the direction close to the slag outlet 12. At this time, the connecting rod 112 is in the initial state, that is, the end of the connecting rod 112 away from the first telescopic rod 111 is located in the connecting groove 1133 on the side away from the slag outlet 12. Then, the end of the connecting rod 112 away from the first telescopic rod 111 slides from the connecting groove 1133 on the side away from the slag outlet 12 to the second groove 1132. Since the distance from the bottom wall of the second groove 1132 to the casting machine 2 is smaller than the distance from the bottom wall of the first groove 1131 and the bottom wall of the connecting groove 1133 to the casting machine 2, so that the bottom wall of the second trough 1132 abuts the connecting rod 112, driving the first telescopic rod 111 and the scraping needle 10 on the mounting plate 9 to slide toward the direction close to the first filter screen 3, which helps the scraping needle 10 to abut against the first filter screen 3. At this time, the slide plate 7 drives the scraping needle 10 to slide toward the direction close to the slag outlet 12, thereby scraping off the debris or incompletely melted raw materials adhering to the first filter screen 3, and then the push rod 17 abuts against the opening and closing door 14, and the push rod 17 pushes the opening and closing door 14 to rotate in the direction away from the slag outlet 12, so that the slag outlet 12 opens, and the scraping needle 10 scrapes the debris into the collection box; then the rodless hydraulic cylinder 24 drives the connecting rod 112 to slide from the second trough 1132 into the connecting trough 1133.

[0060] At this time, under the pulling action of the second tension spring 1141, the first telescopic rod 111 is pulled to drive the mounting plate 9 to slide in the direction away from the first filter screen 3, thereby reducing the abutment force on the first filter screen 3. At the same time, under the adsorption action of the magnet 30 and the iron sheet 31, the connecting rod 112 slides in the direction close to the first groove body 1131; then the spring 6 pushes the first filter screen 3 to slide in the direction away from the casting machine 2, so that the protrusion 51 is disengaged from the abutment block 52, and then the first tension spring 531 pulls the second filter screen 4 to slide in the direction close to the protrusion 51 for reset; then the rodless hydraulic cylinder 24 drives the slide plate 7 to slide in the direction away from the slag outlet 12, so that the push rod 17 and the opening and closing door 14 are disengaged, and the torsion spring 16 drives the opening and closing door 14 to close the slag outlet 12, until the rodless hydraulic cylinder 24 drives the connecting rod 112 to slide away from one end of the first telescopic rod 111 to the connecting groove body 1133 on the side away from the slag outlet 12, and restores the initial state. The use of this equipment to prepare stretch film can ensure to a certain extent that the thickness of the formed film is not too thick.

[0061] The present application also discloses a method for preparing a stretch film. The method uses the above-mentioned stretch film production equipment and further includes the following steps:

[0062] Step 1: Prepare the raw materials;

[0063] Step 2: Put the mixed raw materials into the extruder for hot melting;

[0064] Step 3: The extruder squeezes the molten slurry into the extrusion tube 1, and the slurry is filtered through the first filter 3 in the extrusion tube 1;

[0065] Step 4: When impurities or unmelted raw materials adhere to the first filter screen 3, the slurry pushes the first filter screen 3 through the impurities to drive the first filter screen 3 to slide toward the direction close to the casting machine 2. At this time, the abutment block 52 and the arc surface of the protrusion 51 slide relative to each other, and the abutment block 52 pushes the second filter screen 4 to drive the second slider 20 to slide in the direction away from the block to block a part of the filter holes on the first filter screen 3, thereby reducing the space for impurities or unmelted raw materials to pass through. Then the second slider 20 abuts the pressure sensor 29, and the controller connected to the pressure sensor 29 controls the rodless hydraulic cylinder 24 to start the slide plate 7 toward the slag outlet 1. 2, and the mounting plate 9 is adjusted by the adjusting component 11 to slide toward the direction close to the first filter screen 3, so that the scraping needle 10 abuts against the first filter screen 3, and then the scraping needle 10 picks up the debris or incompletely melted raw materials adhering to the first filter screen 3, and then the push rod 17 pushes the opening and closing door 14 to open the slag outlet 12, and the scraping needle 10 pushes the debris into the collection box, and then the rodless hydraulic cylinder 24 drives the slide plate 7 to slide toward the direction away from the slag outlet 12, and the mounting plate 9 is adjusted by the adjusting member to slide toward the direction away from the first filter screen 3, so that the first filter screen 3 and the second filter screen 4 are reset, and the opening and closing door 14 is driven to the slag outlet 12 by the action of the torsion spring 16;

[0066] Step 5: The slurry continues to pass through the first filter screen 3 and the second filter screen 4, and the molten slurry enters the tape casting machine 2 for forming;

[0067] Step 6: Roll up.

[0068] 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 stretch film production device, comprising an extrusion tube (1) and a casting machine (2), wherein the extrusion tube (1) is connected to the casting machine (2), and is characterized in that: A first filter screen (3) is provided on the side of the extrusion tube (1) close to the casting machine (2) for sliding. The sliding direction of the first filter screen (3) is perpendicular to the plane where the first filter screen (3) is located. A reset member is provided in the extrusion tube (1) for pushing the first filter screen (3) to slide in a direction away from the casting machine (2). A second filter screen (4) is provided on the side of the first filter screen (3) close to the casting machine (2) for sliding. The sliding direction of the second filter screen (4) is parallel to the plane where the first filter screen (3) is located. The second filter screen (4) is in contact with the feed port of the casting machine (2). A transmission component (5) is provided in the extrusion tube (1) for driving the second filter screen (4) to slide when the first filter screen (3) slides. When the first filter screen (3) slides in the direction close to the casting machine (2), the second filter screen (4) drives the corresponding filter hole to move toward the filter hole away from the first filter screen (3). The extrusion tube (1) is provided with a slide plate (7) for sliding, the slide plate (7) is located on the side of the first filter screen (3) away from the casting machine (2), the sliding direction of the slide plate (7) is parallel to the plane where the first filter screen (3) is located, a plurality of through holes (8) are provided on the slide plate (7), a mounting plate (9) is provided on the side of the slide plate (7) close to the first filter screen (3), the sliding direction of the mounting plate (9) is perpendicular to the plane where the first filter screen (3) is located, a plurality of scraping needles (10) are provided on the side of the mounting plate (9) close to the first filter screen (3), the scraping needles (10) are used to abut against the first filter screen (3), a driving member for driving the slide plate (7) to slide is provided in the extrusion tube (1), and an adjusting component (11) for adjusting the mounting plate (9) to slide in a direction close to or away from the first filter screen (3) is provided in the slide plate (7).

2. The stretch film production equipment according to claim 1, characterized in that: The transmission assembly (5) comprises a protrusion (51) arranged on the second filter screen (4), an abutment block (52) arranged in the extrusion tube (1), and a first pulling member (53) arranged on the first filter screen (3); the side of the protrusion (51) close to the casting machine (2) is an arc surface, and the side of the arc surface away from the second filter screen (4) is inclined in a direction away from the casting machine (2); the abutment block (52) is located on the side of the protrusion (51) close to the casting machine (2); the abutment block (52) is used to slide relative to the arc surface of the protrusion (51); and the first pulling member (53) is used to pull the second filter screen (4) to slide in a direction close to the abutment block (52).

3. The stretch film production equipment according to claim 2, characterized in that: The first pulling member (53) includes a first tension spring (531) for pulling the second filter screen (4) to slide toward the abutment block (52), one end of the first tension spring (531) being arranged on the first filter screen (3), and the other end being arranged on the second filter screen (4).

4. The stretch film production equipment according to claim 1, characterized in that: The reset member comprises a spring (6) for pushing the first filter screen (3) to slide in a direction away from the casting machine (2); one end of the spring (6) is arranged in the extrusion tube (1), and the other end is arranged on the first filter screen (3).

5. The stretch film production equipment according to claim 1, characterized in that: The adjusting assembly (11) comprises a first telescopic rod (111) arranged on the mounting plate (9), a connecting rod (112) connected to the side of the first telescopic rod (111) away from the mounting plate (9), a guide groove (113) arranged in the extrusion tube (1) and a second pulling member (114) arranged in the slide plate (7), the sliding direction of the first telescopic rod (111) is arranged in the vertical direction, the first telescopic rod (111) is slidably inserted into the slide plate (7), one end of the connecting rod (112) away from the first telescopic rod (111) is slidably matched with the guide groove (113), the guide groove (113) is located on the side of the connecting rod (112) away from the casting machine (2), the guide groove (113) comprises a first groove body (1131), a second groove body (1132) and a connecting groove body (1133) arranged in the extrusion tube (1), the first groove body (1131) and the second groove body (1132) The length direction of the sliding plate (7) is parallel to the sliding direction of the slide plate (7); the first trough body (1131) is located above the second trough body (1132); the connecting trough body (1133) is located between the first trough body (1131) and the second trough body (1132); one end of the connecting trough body (1133) is connected to the first trough body (1131), and the other end is connected to the second trough body (1132); the first trough body (1131), the second trough body (1132) and the connecting trough body (1133) form a loop; the connecting trough body (1133) is arc-shaped and convex in a direction away from the first trough body (1131); the distance from the bottom wall of the second trough body (1132) to the casting machine (2) is smaller than the distance from the bottom wall of the first trough body (1131) and the connecting trough body (1133) to the casting machine (2); and the second pulling member (114) is used to pull the mounting plate (9) to slide in a direction away from the first filter screen (3).

6. The stretch film production equipment according to claim 5, characterized in that: The second pulling member (114) includes a second tension spring (1141) for pulling the mounting plate (9) to slide in a direction away from the first filter screen (3); one end of the second tension spring (1141) is arranged in the slide plate (7), and the other end is arranged on the mounting plate (9).

7. The stretch film production equipment according to claim 5, characterized in that: A slag outlet (12) is provided on one side of the extrusion tube (1), and the slag outlet (12) corresponds to the position of the slide plate (7). A collection box (13) is connected to the extrusion tube (1), and the collection box (13) is communicated with the slag outlet (12). An opening and closing door (14) for opening and closing the slag outlet (12) is hingedly connected to the collection box (13). The cross-sectional area of the opening and closing door (14) is larger than the cross-sectional area of the slide plate (7). A rotating shaft (15) is coaxially arranged on the opening and closing door (14). A torsion spring (16) is sleeved on the rotating shaft (15) for driving the opening and closing door (14) to rotate in a direction close to the slag outlet (12). One end of the torsion spring (16) is arranged on the opening and closing door (14), and the other end is arranged on the collection box (13). When the slide plate (7) slides in a direction close to the collection box (13), the connecting rod (112) slides in the second trough body (1132).

8. The stretch film production equipment according to claim 7, characterized in that: A push rod (17) for contacting the opening and closing door (14) is provided on one side of the slide plate (7) close to the collecting box (13).

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