A high peel strength PVC film calender

Abstract

The application relates to a high-peeling-strength PVC film roller machine, belonging to the field of PVC film production and manufacturing, which comprises a rack, a discharging cutter and a circulation mechanism, two parallel pressure rollers are rotationally connected to the rack, a gap is arranged between the two pressure rollers, a feeding conveyor belt and a discharging conveyor belt are arranged on the opposite sides of the pressure rollers on the rack, the discharging cutter is provided with two blades which abut against the roller surfaces of the pressure rollers, the material between the two discharging cutters leaves the pressure rollers and moves to the discharging conveyor belt, the material falls from the feeding conveyor belt and enters between the two pressure rollers, the circulation mechanism comprises a partition plate, the partition plate is located above the pressure rollers, the plate surface of the partition plate is perpendicular to the axis of the pressure rollers, the lower edge of the partition plate is in contact with the roller surface of the pressure rollers, and the discharging cutter and the feeding conveyor belt are respectively arranged on the opposite sides of the partition plate. The circulation mechanism makes most of the material pass through the extrusion of the pressure rollers for multiple times, improves the sufficiency of material pressure, reduces the content of the material pores, and improves the forming quality of the PVC film.

Description

Technical Field

[0001] This application relates to the field of PVC film manufacturing, and in particular to a high peel strength PVC film rolling mill. Background Technology

[0002] PVC's main component is polyvinyl chloride, and the film material made from it is a slightly yellowish, translucent, and glossy substance. In traditional waterproof materials such as rainproof tarpaulins, tarpaulins, and raincoat fabrics, fiber fabrics are typically laminated with PVC films, resulting in a fabric with high waterproof performance. The mechanical strength required to separate the fiber fabric from the PVC film is called peel strength. For PVC films with poor surface quality, the peel strength of the resulting waterproof fabric is lower.

[0003] In related technologies, a PVC film production process includes: raw material mixing, primary plasticizing, filtration, secondary plasticizing, calendering and cooling, and slitting and winding. The primary plasticizing process uses an extruder to bring the mixed raw materials to a molten state. Filtration removes unmelted impurities from the material using a filter screen at the end of the extruder, resulting in a porous molten material. The secondary plasticizing process uses a rolling mill to repeatedly extrude the material, eliminating voids and increasing the density of the molten material. The calendering and cooling process uses a calendering roll assembly composed of multiple parallel rollers to further extrude the material, forming a film of the desired thickness and cooling it for shaping. Cooling water flows through some of the rollers in the calendering roll assembly. Throughout the process, the effectiveness of the secondary plasticizing process in removing voids from the molten material directly affects the product's molding quality.

[0004] A rolling mill consists of two closely spaced, counter-rotating pressure rollers. These rollers have internal energy devices that maintain a certain high temperature on their surfaces. Molten material flowing from the extruder falls between the two rollers and is subjected to compression. A conveyor belt is located on the side of the rollers away from the extruder, transporting the material from the rollers to a calendering roller assembly. Rolling mills are more effective at removing internal porosity from materials than calendering roller assemblies. However, due to limitations in space, energy, equipment, or cost, ordinary rolling mills typically have fewer rollers, resulting in shorter material winding cycles and fewer loops, leading to less sufficient compression and thus poorer removal of internal porosity. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a high peel strength PVC film rolling mill.

[0006] The high peel strength PVC film rolling mill provided in this application adopts the following technical solution:

[0007] A high peel strength PVC film rolling mill includes a frame with two parallel pressure rollers rotatably connected to the frame, forming a gap between them. The frame is equipped with a feed conveyor belt and a discharge conveyor belt, located on opposite sides of the pressure rollers. It also includes two discharge cutters, each with its blade abutting against the roller surface of the pressure roller. Material between the two discharge cutters leaves the pressure roller and moves onto the discharge conveyor belt. The material falls from the feed conveyor belt and enters the space between the two pressure rollers from above. The frame is equipped with a circulation mechanism, which includes a partition plate located above the pressure roller and connected to the frame. The surface of the partition plate is perpendicular to the axis of the pressure roller, and its lower edge contacts the roller surface. The discharge cutters and the feed conveyor belt are located on opposite sides of the partition plate.

[0008] By adopting the above technical solution, the feeding section and the discharging section are separated, which increases the difficulty of moving the material from one side of the partition plate to the other side. Most of the material can be squeezed multiple times by the pressure rollers on the side of the partition plate facing the feeding conveyor belt, and the plasticized material is more fully compressed, which is conducive to improving the removal effect of voids inside the material.

[0009] Preferably, the frame is provided with a circulating cutter, which is located between the partition plate and the feeding conveyor belt. The blade of the circulating cutter abuts against the roller surface of the pressure roller. The frame is also provided with a first material feeding component, which is located between the circulating cutter and the feeding conveyor belt. The edge of the material cut by the circulating cutter abuts against the side of the first material feeding component facing the feeding conveyor belt.

[0010] By adopting the above technical solution, the circulating cutter cuts the material after it passes the pressure roller, and the material on both sides of the cutting plane can go to different positions. The first material feeding component is used to directionally move the material, improving the smoothness of the material near the partition plate moving to the other side of the partition plate.

[0011] Preferably, both the circulating cutter and the discharge cutter include a cutter disc and a fixed rod. The fixed rod is connected to the frame, the cutter disc is rotatably connected to the fixed rod, and the rotation axis of the cutter disc is parallel to the axis of the pressure roller.

[0012] Preferably, the fixed rod is slidably connected to the frame, and the sliding direction is perpendicular to the axis of the pressure roller. An abutment spring is connected between the frame and the fixed rod, and the abutment spring applies a force to the fixed rod to bring it closer to the pressure roller.

[0013] By adopting the above technical solution, under natural conditions, the tension spring applies a force to the fixed rod, bringing it closer to the pressure roller, thereby ensuring that the blade of the cutter disc is always in close contact with the roller surface of the pressure roller, thus guaranteeing its cutting effect on the material.

[0014] Preferably, the frame is further provided with a second material feeding component, which is located on the side of the partition plate facing the discharge conveyor belt. The edge of the material after being cut by the circulating cutter abuts against the side of the second material feeding component facing the discharge conveyor belt.

[0015] Preferably, the frame is further provided with an auxiliary material feeding component, which is located on the side of the feeding conveyor belt away from the partition plate. The edge of the material on the side of the circulating cutter away from the discharge conveyor belt, away from the circulating cutter, abuts against the side of the auxiliary material feeding component facing the partition plate.

[0016] By adopting the above technical solution, the second feeding component and the auxiliary feeding component have similar functions to the first feeding component. They push the material at the edge of the material and each feeding component pushes the material after it has been cut by the circulating cutter in a directional manner, making the material on the pressure roller thicker and increasing the squeezing force on it during the next pressure.

[0017] Preferably, the first feeding component, the second feeding component, and the auxiliary feeding component are feeding sleeves. The feeding sleeves are rotatably connected to the frame, and the rotation axis is perpendicular to the axis of the pressure roller. A guide groove is provided on the side wall of the feeding sleeve. The groove surface of the guide groove is an arc surface, and the groove surface of the guide groove abuts against the edge of the material.

[0018] By adopting the above technical solution, the edge of the material comes into contact with the surface of the guide groove. At the same time, the surface of the guide groove forms a curling and squeezing effect on the edge of the material, causing the edge of the material to gather and roll inward.

[0019] Preferably, a contact ball is embedded at the center of one end of the feeding sleeve facing the pressure roller, and the contact ball abuts against the side wall of the pressure roller.

[0020] By adopting the above technical solution, the feeding component and the pressure roller abut against each other, and their relative positions have high stability, while hardly affecting their respective rotation process.

[0021] Preferably, an auger roller is rotatably connected to the frame on the side of the partition plate facing the feed conveyor belt, with the rotation axis parallel to the axis of the pressure roller. The auger roller is provided with multiple forward-rotating blades and multiple reverse-rotating blades, which are arranged alternately along the axis of the auger roller. The forward-rotating blades and reverse-rotating blades abut against the side of the material away from the pressure roller.

[0022] By adopting the above technical solution, during the process of the material passing over the pressure roller, the forward and reverse rotating blades on the auger roller come into contact with the material and rotate under the action of the thrust and friction force applied by the material. At the same time, the reaction force applied by each blade to the material causes compressive stress and tensile stress at different positions of the material, which has a certain effect of reducing the size of the pores.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By setting up the partition plate, the feeding section and the discharging section are separated, which increases the difficulty of moving the material from one side of the partition plate to the other side. Most of the material can be squeezed multiple times by the pressure roller on the side of the partition plate facing the feeding conveyor belt, and the plasticized material is more fully compressed, which is conducive to improving the removal effect of voids inside the material.

[0025] 2. Through the setting of the first feeding component, the second feeding component and the auxiliary feeding component, each feeding sleeve will push the material after being cut by the circulating cutter in a directional manner, so that the material on the pressure roller becomes thicker, thereby increasing the squeezing force on it during the next pressure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the high peel strength PVC film rolling mill used in the embodiments of this application.

[0027] Figure 2 yes Figure 1 A magnified view of part A in the middle.

[0028] Figure 3 This is a schematic diagram illustrating the working structure of the material feeding sleeve in the embodiments of this application.

[0029] Explanation of reference numerals in the attached drawings: 1. Frame; 111. Pressure roller; 11. Feed conveyor belt; 12. Discharge conveyor belt; 13. Discharge cutter; 131. Cutter disc; 132. Fixing rod; 133. Abutment spring; 2. Circulation mechanism; 21. Partition plate; 22. Circulation cutter; 23. Screw roller; 231. Forward rotating blade; 232. Reverse rotating blade; 31. First feeding component; 32. Second feeding component; 33. Auxiliary feeding component; 34. Guide groove; 35. Contact ball. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a high peel strength PVC film rolling mill, such as... Figure 1 As shown, the machine includes a frame 1, with a feeding conveyor belt 11 for feeding material on one side and a discharging conveyor belt 12 for discharging material on the other side. Two pressure rollers 111 for extruding material are rotatably connected to the frame 1. The frame 1 also has a circulation mechanism 2 for repeatedly rotating the plasticized material around the pressure rollers 111. Before entering the pressure rollers 111, the material is in the shape of a round rope, and after being extruded by the pressure rollers 111, it becomes a sheet.

[0032] like Figure 1As shown, two pressure rollers 111 are arranged side by side and rotate in opposite directions. Their axes are parallel, and there is a uniform gap between their roller surfaces. The conveying directions of the feed conveyor belt 11 and the discharge conveyor belt 12 are parallel to each other and perpendicular to the axis of the pressure rollers 111. After leaving the extruder, the material falls onto the feed conveyor belt 11, and then falls off the feed conveyor belt 11 at its end and enters the gap between the two pressure rollers 111 from above. Under the rotational squeezing action of the two pressure rollers 111, the material will pass through the gap and enter below the pressure rollers 111, while simultaneously wrapping around the surface of the pressure rollers 111 near the discharge conveyor belt 12. The circulation mechanism 2 includes a partition plate 21, which is fixedly connected to the frame 1 and located above the pressure roller 111. The plate surface is perpendicular to the axis of the pressure roller 111. The discharge conveyor belt 12 and the feed conveyor belt 11 are located on opposite sides of the partition plate 21. The lower edge of the partition plate 21 contacts the roller surface of the pressure roller 111. That is, the material falling from the feed conveyor belt 11 to the area between the two pressure rollers 111 can hardly reach the side of the partition plate 21 away from the feed conveyor belt 11 without bypassing the pressure roller 111.

[0033] like Figure 1 and 2 As shown, a discharge cutter 13 is provided on the frame 1 on the side of the pressure roller 111 facing the discharge conveyor belt 12. There are two discharge cutters 13, and their blades are in contact with the roller surface of the pressure roller 111. The cutting plane of the discharge cutter 13 is perpendicular to the axis of the pressure roller 111. The discharge cutter 13 includes a cutter disc 131 and a fixed rod 132. The cutter disc 131 is rotatably connected to one end of the fixed rod 132, and the axis of rotation is parallel to the axis of the pressure roller 111. The fixed rod 132 is slidably connected to the frame 1, and the sliding direction is perpendicular to the axis of the pressure roller 111. A tension spring 133 is connected between the frame 1 and the fixed rod 132. In the natural state, the tension spring 133 applies a force to the fixed rod 132 to bring it closer to the pressure roller 111, so that the blade of the cutter disc 131 is always in close contact with the roller surface of the pressure roller 111, ensuring its cutting effect on the material. Two discharge cutters 13 are located directly below the discharge conveyor belt 12. The two discharge cutters 13 cut off part of the material between them by the cutter disc 131, and then leave the pressure roller 111 and move onto the discharge conveyor belt 12.

[0034] like Figure 1 , 2As shown in Figure 3, the circulation mechanism 2 also includes two circulation cutters 22. The structure of the circulation cutters 22 and their connection with the frame 1 are the same as those of the discharge cutter 13. Along the axial direction of the pressure roller 111, the circulation cutter 22 is located between the partition plate 21 and the feed conveyor belt 11. The frame 1 is also provided with a first material feeding component 31, a second material feeding component 32, and an auxiliary material feeding component 33. The first material feeding component 31 is located between the circulation cutter 22 and the feed conveyor belt 11. The second material feeding component 32 is located on the side of the partition plate 21 facing the discharge conveyor belt 12. The auxiliary material feeding component 33 is located on the side of the feed conveyor belt 11 away from the partition plate 21. The material on the side of the circulating cutter 22 closest to the feed conveyor belt 11 away from the discharge conveyor belt 12 has its two edges abutting against the side of the first feeding component 31 facing the feed conveyor belt 11 and the side of the auxiliary feeding component 33 facing the partition plate 21, respectively; the material on the side of the circulating cutter 22 closest to the discharge conveyor belt 12 has its edge near the circulating cutter 22 abutting against the side of the second feeding component 32 facing the discharge conveyor belt 12, thereby allowing this part of the material to successfully enter the partition plate 21 on the side away from the feed conveyor belt 11. The first feeding component 31, the second feeding component 32, and the auxiliary feeding component 33 are feeding sleeves. The feeding sleeves are rotatably connected to the frame 1, and the rotation axis is perpendicular to the axis of the pressure roller 111. A contact ball 35 is embedded in the center of the end of the feeding sleeve facing the pressure roller 111. The contact ball 35 abuts against the side wall of the pressure roller 111. A guide groove 34 is opened on the side wall of the part of the feeding sleeve near the surface of the pressure roller 111. The groove surface of the guide groove 34 is an arc surface. The edge of the material abuts against the groove surface of the guide groove 34. At the same time, the groove surface of the guide groove 34 forms a curling and squeezing effect on the edge of the material, causing the edge of the material to gather and roll inward. The gathering and rolling of the material by the first feeding component 31 and the auxiliary feeding component 33 is used to improve the fullness of the material when it is squeezed by the pressure roller 111 next time. The gathering and rolling of the material by the second feeding component 32 is used to guide the material to be successfully moved to the other side of the partition plate 21.

[0035] like Figure 1 As shown, an auger roller 23 is rotatably connected to the frame 1 on the side of the partition plate 21 facing the feed conveyor belt 11. The auger roller 23 is located below the pressure roller 111 on which the material is wound, and its rotation axis is parallel to the axis of the pressure roller 111. The auger roller 23 is provided with multiple forward-rotating blades 231 and multiple reverse-rotating blades 232, which are arranged alternately along the axis of the auger roller 23. The forward-rotating blades 231 and reverse-rotating blades 232 abut against the side of the material away from the pressure roller 111. As the material passes over the pressure roller 111, the forward-rotating blades 231 and reverse-rotating blades 232 on the auger roller 23 come into contact with the material and rotate under the action of the pushing force and friction force applied by the material. At the same time, the reaction force applied by each blade to the material causes compressive stress and tensile stress at different positions of the material, which has a certain effect of reducing the size of the pores.

[0036] The implementation principle of a high peel strength PVC film rolling mill according to an embodiment of this application is as follows:

[0037] The feeding conveyor belt 11 feeds the plasticized material between two pressure rollers 111. The two pressure rollers 111 squeeze and stretch the material. The circulation mechanism 2 is used to increase the number of times most of the material rotates around the partition plate 21 on the side facing the feeding conveyor belt 11. When the material rotates to the side of the circulation cutter 22 facing the discharge conveyor belt 12, the material can enter the side of the partition plate 21 facing the discharge conveyor belt 12. The material cut by the two discharge cutters 13 can then leave the pressure rollers 111. The discharge conveyor belt 12 carries this part of the material away and enters the next calendering process.

[0038] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high peel strength PVC film rolling mill, comprising a frame (1), wherein two parallel pressure rollers (111) are rotatably connected to the frame (1), a gap is formed between the two pressure rollers (111), a feeding conveyor belt (11) and a discharging conveyor belt (12) are provided on the frame (1), the feeding conveyor belt (11) and the discharging conveyor belt (12) are respectively located on opposite sides of the pressure rollers (111), and further comprising discharging cutters (13), wherein two discharging cutters (13) are provided and their blades abut against the roller surface of the pressure rollers (111), and the material between the two discharging cutters (13) leaves the pressure rollers (111) and moves onto the discharging conveyor belt (12), characterized in that: Material falls from the feed conveyor belt (11) and enters between the two pressure rollers (111) from above. The frame (1) is provided with a circulation mechanism (2). The circulation mechanism (2) includes a partition plate (21). The partition plate (21) is located above the pressure rollers (111) and connected to the frame (1). The plate surface of the partition plate (21) is perpendicular to the axis of the pressure rollers (111), and the lower edge of the partition plate (21) is in contact with the roller surface of the pressure rollers (111). The discharge cutter (13) and the feed conveyor belt (11) are located on opposite sides of the partition plate (21). The frame (1) is provided with a circulating cutter (22), which is located between the partition plate (21) and the feeding conveyor belt (11). The blade of the circulating cutter (22) abuts against the roller surface of the pressure roller (111). The frame (1) is also provided with a first material feeding component (31), which is located between the circulating cutter (22) and the feeding conveyor belt (11). The edge of the material cut by the circulating cutter (22) abuts against the side of the first material feeding component (31) facing the feeding conveyor belt (11). Both the circulating cutter (22) and the discharge cutter (13) include a cutter disc (131) and a fixed rod (132). The fixed rod (132) is connected to the frame (1). The cutter disc (131) is rotatably connected to the fixed rod (132). The rotation axis of the cutter disc (131) is parallel to the axis of the pressure roller (111). The fixed rod (132) is slidably connected to the frame (1). The sliding direction is perpendicular to the axis of the pressure roller (111). A retaining spring (133) is connected between the frame (1) and the fixed rod (132). The retaining spring (133) applies a force to the fixed rod (132) to bring it closer to the pressure roller (111). The frame (1) is also provided with a second material feeding component (32). The second material feeding component (32) is located on the side of the partition plate (21) facing the discharge conveyor belt (12). The edge of the material after being cut by the circulating cutter (22) abuts against the side of the second material feeding component (32) facing the discharge conveyor belt (12). The frame (1) is also provided with an auxiliary material feeding component (33). The auxiliary material feeding component (33) is located on the side of the feeding conveyor belt (11) away from the partition plate (21). The material on the side of the circulating cutter (22) away from the discharge conveyor belt (12) abuts against the side of the auxiliary material feeding component (33) facing the partition plate (21). The first feeding component (31), the second feeding component (32) and the auxiliary feeding component (33) are feeding sleeves. The feeding sleeves are rotatably connected to the frame (1), and the rotation axis is perpendicular to the axis of the pressure roller (111). A guide groove (34) is provided on the side wall of the feeding sleeve. The groove surface of the guide groove (34) is an arc surface. The groove surface of the guide groove (34) abuts against the edge of the material. A contact ball (35) is embedded at the center of one end of the feeding sleeve facing the pressure roller (111). The contact ball (35) abuts against the side wall of the pressure roller (111).

2. A high peel strength PVC film rolling mill according to claim 1, characterized in that: A screw conveyor roller (23) is rotatably connected to the frame (1) on the side of the partition plate (21) facing the feed conveyor belt (11). The rotation axis is parallel to the axis of the pressure roller (111). The screw conveyor roller (23) is provided with multiple forward rotating blades (231) and multiple reverse rotating blades (232). The forward rotating blades (231) and reverse rotating blades (232) are arranged alternately along the axis of the screw conveyor roller (23). The forward rotating blades (231) and reverse rotating blades (232) abut against the side of the material away from the pressure roller (111).

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