A calendering structure for the production of a protective film

Abstract

The utility model discloses a kind of calendering structures for protective film production, belong to protective film production calendering structure technical field.A kind of calendering structure for protective film production, including roll body being rotatably installed on machine body, liquid inlet pipe and liquid discharge cap, the roll body is formed by the inner tube and outer tube of coaxial arrangement, annular cooling cavity is formed between inner tube and outer tube, liquid inlet pipe and liquid discharge cap are communicated with annular cooling cavity, fixedly installed on the inner cylindrical surface of outer tube Turbulent block, wherein, turbulent block is distributed along outer tube circumferential direction in several rows, the turbulent block of adjacent row is staggered on outer tube, turbulent block is set to inclined angle relative to outer tube axis, and the turbulent block in same row is consistent in rotation direction, the rotation direction of turbulent convex of adjacent row is opposite;The utility model utilizes turbulent block to make cooling liquid form turbulent flow in annular cooling cavity, to avoid the problem that laminar flow is generated in annular cooling cavity and heat exchange effect is reduced, effectively improve the overall heat conduction efficiency of cooling roll.

Description

Technical Field

[0001] This utility model relates to the field of calendering structure technology for protective film production, and in particular to a calendering structure for protective film production. Background Technology

[0002] A protective film calender is a specialized piece of equipment used to continuously extrude and stretch plastics, rubber, or other polymer materials through high-temperature and high-pressure rollers to produce uniform, high-precision thickness films. Calendering protective films is a core process, the purpose of which is to precisely control the thickness of the film and ensure its uniformity, while significantly improving surface quality and eliminating bubbles, impurities, or unevenness that may exist in the raw materials, making the surface smoother and flatter.

[0003] The protective film calender is a core piece of equipment used to produce high-precision protective films. It mainly consists of a calendering roller structure, a transmission device, a temperature control module, a feeding unit, and auxiliary devices. Its core is 3-5 high-precision metal calendering rollers. The roller spacing is precisely adjusted by hydraulic or screw mechanisms. When the equipment is running, the pre-plasticized polymer raw material is fed into the heated rollers through an extruder. Under the step-by-step extrusion of the rotating rollers, it is stretched and thinned to the target thickness. At the same time, it is quickly shaped and cured by the cooling rollers.

[0004] In existing technologies, cooling rollers typically employ a double-layer cylindrical structure consisting of an inner and outer cylinder, forming an annular cooling cavity between them. During operation, the cooling medium flows in from one end of the cavity and out from the other, carrying away heat from the roller surface in direct contact with the high-temperature material through heat conduction. However, the internal cavity structure of such traditional cooling rollers is relatively simple, which makes it easy for the cooling medium to form a laminar flow state when flowing through the annular cavity. In the laminar flow state, the medium velocity is significantly unevenly distributed radially, and the medium's own heat exchange is insufficient. This makes it difficult for the hot medium in the area close to the high-temperature roller wall to achieve efficient heat transfer with the low-temperature medium in the center of the cavity. This situation not only increases the high-temperature thermal resistance near the roller wall but also makes it difficult for the heat accumulated on the roller wall to be quickly and effectively transferred to the cooling medium, ultimately resulting in a significant limitation on the overall heat conduction efficiency. Utility Model Content

[0005] The purpose of this invention is to solve the problem that the simple design of the cooling roller channel in the prior art easily leads to laminar flow, resulting in insufficient heat exchange and limited overall heat conduction efficiency. Therefore, this invention proposes a calendering structure for the production of protective films.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A calendering structure for producing protective films includes a roller, an inlet pipe, and a drain cap rotatably mounted on a machine body. The roller is composed of an inner cylinder and an outer cylinder arranged coaxially, forming an annular cooling cavity between the inner and outer cylinders. The inlet pipe and the drain cap are connected to the annular cooling cavity. The structure also includes turbulence blocks fixedly mounted on the inner cylindrical surface of the outer cylinder. The turbulence blocks are distributed in several rows along the circumference of the outer cylinder, with adjacent rows of turbulence blocks staggered on the outer cylinder. The turbulence blocks are tilted at an angle relative to the axis of the outer cylinder, and the turbulence blocks in the same row rotate in the same direction. The turbulence protrusions in adjacent rows rotate in opposite directions. When the coolant flows, contact with adjacent turbulence blocks causes a change in the flow direction of some of the coolant.

[0007] To facilitate the rotation of the cooling roller, preferably, a drive rod is fixedly installed on the inner cylinder, and a fixed plate and a sealing plate are fixedly installed on the drive rod along its axial direction, forming a liquid storage channel between the fixed plate and the sealing plate.

[0008] To facilitate coolant flow, the drive rod is further provided with a through hole that is connected to the liquid storage channel, and a release hole is provided on the fixed plate, through which the liquid storage channel is connected to the annular cooling cavity.

[0009] To facilitate the formation of turbulence within the cooling channel, preferably, the ratio of the height of the turbulence block to the radial distance of the annular cooling cavity is 1:5.

[0010] To reduce resistance to coolant flow, preferably, the surface of the turbulence block has a smooth, rounded corner, which allows the coolant to flow smoothly when it comes into contact with the turbulence block.

[0011] To improve the turbulence effect within the annular cooling cavity, preferably, the tilt angle of the turbulence block is in the range of 30-60 degrees.

[0012] Compared with the prior art, this utility model provides a calendering structure for the production of protective films, which has the following beneficial effects: This calendering structure for protective film production utilizes turbulent flow blocks. On one hand, it allows coolant to enter the annular cooling chamber. Upon contact with the turbulent flow blocks, the coolant forms turbulence within the chamber. On the other hand, the opposing rotation of the turbulent flow blocks ensures that the coolant flows between adjacent blocks in opposite directions, further enhancing the turbulence effect. This prevents laminar flow of the coolant within the annular cooling chamber, effectively improving the heat exchange efficiency of the coolant. Consequently, the heat from the cooling roller wall is rapidly transferred to the cooling medium, improving the overall heat transfer efficiency.

[0013] The parts of this device not covered are the same as or can be implemented using existing technologies. This utility model uses turbulent blocks to make the coolant form turbulent flow in the annular cooling chamber, thereby avoiding the problem of laminar flow in the annular cooling chamber reducing the heat exchange effect and effectively improving the overall heat transfer efficiency of the cooling roller. Attached Figure Description

[0014] Figure 1 This is an isometric structural diagram of a calendering structure for protective film production proposed in this utility model; Figure 2 This is a schematic diagram of the isometric structure of a roller body for a calendering structure used in the production of protective films, as proposed in this utility model. Figure 3 This invention provides a schematic diagram of a partial structure of a calendering roller for protective film production. Figure 1 ; Figure 4 This invention provides a schematic diagram of a partial structure of a calendering roller for protective film production. Figure 2 ; Figure 5 This utility model proposes a calendering structure for the production of protective films. Figure 4 Enlarged structural diagram at point A in the middle; Figure 6 This invention provides a schematic diagram of a partial structure of a calendering roller for protective film production. Figure 3 .

[0015] In the diagram: 1. Roller body; 2. Inner cylinder; 3. Inlet pipe; 4. Drain cap; 5. Turbulence block; 6. Drive rod; 7. Fixing plate; 8. Sealing plate. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0017] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Example: Reference Figures 1-6A calendering structure for protective film production includes a roller 1 rotatably mounted on a machine body, an inlet pipe 3, and a drain cap 4. The inlet pipe 3 is rotatably mounted on the roller 1, and the drain cap 4 is fitted onto the cylindrical surface of the inlet pipe 3. The roller 1 is composed of an inner cylinder 2 and an outer cylinder coaxially arranged, forming an annular cooling chamber between the inner cylinder 2 and the outer cylinder. The inlet pipe 3 and the drain cap 4 communicate with the annular cooling chamber. The structure further includes: turbulent flow blocks 5 fixedly mounted on the inner cylindrical surface of the outer cylinder. The turbulent flow blocks 5 are distributed in several rows along the circumference of the outer cylinder, with adjacent rows of turbulent flow blocks 5 staggered on the outer cylinder. In this application, each row of turbulent flow blocks 5 contains 5 blocks, and the 5 blocks are equidistantly arranged, forming a cooling flow channel between the turbulent flow blocks 5. The arc length of the cooling flow channel is the same as the sum of the arc lengths of the turbulent flow blocks 5 in the same row, and the cooling flow channel formed by the turbulent flow blocks 5 is connected to the adjacent rows of turbulent flow blocks 5. The cooling flow channel formed by the turbulent block 5 is installed in a staggered manner, which effectively improves the flow effect of the coolant and enhances the turbulent flow effect. This avoids the formation of laminar flow in the annular cooling cavity, which would lead to poor heat exchange. The turbulent block 5 is set at an angle relative to the axis of the outer cylinder, and the turbulent blocks 5 in the same row have the same rotation direction. The turbulent protrusions in adjacent rows have opposite rotation directions. When the coolant flows, it contacts the adjacent turbulent block 5, causing part of the coolant to change its flow direction. If the coolant flows to the left when it contacts the turbulent block 5, then the next row of turbulent blocks 5 in the coolant flow direction will cause the coolant to rotate to the right. At this time, turbulence is formed in the annular cooling cavity, which breaks the laminar flow effect and improves the heat exchange effect. This allows the protective film to cool and solidify quickly after contacting the roller body 1, avoiding insufficient heat exchange on the roller body 1, which would otherwise cause the protective film to be difficult to cool and solidify quickly.

[0019] Specifically, the turbulence block 5 allows the coolant to enter the annular cooling chamber. After the coolant comes into contact with the turbulence block 5, it creates turbulence within the annular cooling chamber. Furthermore, the opposite rotation of the turbulence block 5 ensures that the coolant flows between adjacent turbulence blocks 5, further enhancing the turbulence effect. This prevents laminar flow of the coolant within the annular cooling chamber, effectively improving the heat exchange efficiency of the coolant. Consequently, the heat from the roller wall of the cooling roller is quickly transferred to the cooling medium, improving the overall heat transfer efficiency. This allows the protective film to cool and solidify rapidly after contacting the roller body 1 following heating and calendering, avoiding the problem of the protective film being difficult to solidify quickly after calendering due to low heat transfer efficiency.

[0020] A drive rod 6 is fixedly installed on the inner cylinder 2, and a fixing plate 7 and a sealing plate 8 are fixedly installed on the drive rod 6 along its axial direction. A liquid storage channel is formed between the fixing plate 7 and the sealing plate 8. On the one hand, after the drive rod 6 is installed with the machine body, it is convenient for the machine body's drive device to drive the drive rod 6 to work, thereby making the roller 1 rotate. The liquid storage channel near the liquid inlet pipe 3 serves as a liquid discharge channel, while the liquid storage channel away from the liquid inlet pipe 3 serves as a liquid inlet channel. This allows the coolant to circulate in the annular cooling chamber, avoiding the problem that the coolant cannot flow, thereby reducing the heat conduction effect and making it difficult for the protective film to be quickly fixed.

[0021] The drive rod 6 has a through hole that is connected to the liquid storage channel. The fixed plate 7 has a release hole. The liquid storage channel is connected to the annular cooling cavity through the release hole. The through hole on the drive rod 6 is used to inject or discharge the coolant into the annular cooling cavity to prevent the coolant from staying in the annular cooling cavity for a long time, which would cause the problem of heat conduction failure and thus prevent the protective film from being cooled and solidified.

[0022] The ratio of the height of the turbulent block 5 to the radial distance of the annular cooling cavity is 1:5. The height of the turbulent block 5 occupies one-fifth of the diameter of the annular cooling cavity. If the turbulent block 5 is too high, it will increase the flow resistance of the coolant, thus reducing the effect of turbulence. At the same time, if the height of the turbulent block 5 is too low, it will be difficult to form turbulence when the coolant flows, thus causing the turbulent block 5 to lose its original function, making it difficult to improve the heat exchange effect, and causing the protective film to be difficult to cool and solidify quickly.

[0023] The surface of the turbulent block 5 has smooth, rounded corners. When the coolant comes into contact with the turbulent block 5, it allows the coolant to flow smoothly, avoiding strong resistance that would make it difficult for the coolant to flow slowly and form a turbulent effect in the annular cooling chamber. This would prevent the laminar flow effect from being broken, reduce the heat transfer effect, and effectively improve the heat transfer effect of the roller body 1. This allows the protective film to be cooled, solidified, and formed quickly, making it convenient to use.

[0024] The tilt angle of the turbulence block 5 is in the range of 30-60 degrees. The tilt angle of the turbulence block 5 in this application is 30 degrees. By using the turbulence block 5 tilted at 30 degrees, on the one hand, the coolant will generate a certain swirling direction when it comes into contact with the turbulence block 5. On the other hand, if the angle is too large, it will increase the resistance of the coolant flow in the annular cooling chamber. This avoids the problem that the coolant flow rate will decrease due to the tilt angle being too large, making it difficult to form a turbulent effect when the coolant flows. This further enhances the turbulent effect formed after the coolant comes into contact with the turbulence block 5, thereby improving the heat conduction effect of the roller body 1. This avoids the problem that insufficient heat exchange will make it difficult for the heat of the roller body 1 to be quickly transferred to the coolant, which in turn will lead to the problem that the protective film is difficult to cool and solidify quickly after it comes into contact with the roller body 1.

[0025] In this invention, coolant is first injected into the inlet pipe 3, then guided into the drain channel from the inner cylinder 2. Subsequently, coolant is injected into the annular cooling chamber through the release hole in the fixing plate 7. When the coolant contacts the turbulence block 5, due to the resistance and the turbulence block 5's swirling direction, eddies are generated as the coolant flows out of the cooling flow channel. When the coolant contacts adjacent rows of turbulence blocks 5, the opposite swirling directions of the adjacent blocks create opposite swirling eddies, thus creating turbulence and preventing the coolant from flowing in a circular path. When the coolant flows within the cooling chamber, laminar flow is formed, which reduces the heat exchange effect. Turbulent flow is used to break the laminar flow and improve the heat exchange effect between coolants, thereby improving the heat conduction effect of roller 1. This allows the protective film to cool and solidify quickly when it comes into contact with roller 1. After flowing through the coolant, the film enters the drain channel and is finally discharged by the drain cap 4. This creates a circulating flow effect of the coolant within the annular cooling channel, preventing the coolant from remaining in the annular cooling chamber for a long time, which would reduce the heat conduction effect and make it difficult for the protective film to cool and solidify quickly. This would also prevent the protective film from retaining residual heat and easily deforming.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A calendering structure for producing protective films, comprising a roller (1) rotatably mounted on a machine body, an inlet pipe (3), and a drain cap (4), wherein the roller (1) is composed of an inner cylinder (2) and an outer cylinder arranged coaxially, an annular cooling chamber is formed between the inner cylinder (2) and the outer cylinder, and the inlet pipe (3) and the drain cap (4) are connected to the annular cooling chamber, characterized in that, Also includes: Turbulence block (5) is fixedly installed on the inner cylindrical surface of the outer cylinder. Among them, the turbulent blocks (5) are distributed in several rows along the circumference of the outer cylinder. The turbulent blocks (5) in adjacent rows are staggered on the outer cylinder. The turbulent blocks (5) are tilted relative to the axis of the outer cylinder. The turbulent blocks (5) in the same row have the same rotation direction. The turbulent protrusions in adjacent rows have opposite rotation directions. When the coolant flows, it contacts the adjacent turbulent blocks (5) to change the flow direction of some coolant.

2. The calendering structure for producing protective films according to claim 1, characterized in that, A drive rod (6) is fixedly installed on the inner cylinder (2), and a fixed plate (7) and a sealing plate (8) are fixedly installed on the drive rod (6) along its axial direction, forming a liquid storage channel between the fixed plate (7) and the sealing plate (8).

3. A calendering structure for producing protective films according to claim 2, characterized in that, The drive rod (6) has a through hole, which is connected to the liquid storage channel. The fixed plate (7) has a release hole, which is connected to the annular cooling chamber through the release hole.

4. A calendering structure for producing protective films according to claim 1, characterized in that, The ratio of the height of the turbulent block (5) to the radial distance of the annular cooling cavity is 1:

5.

5. A calendering structure for producing protective films according to claim 1, characterized in that, The surface of the turbulent block (5) has rounded corners with smooth transitions, which allow the coolant to flow smoothly when it comes into contact with the turbulent block (5).

6. A calendering structure for producing protective films according to claim 1, characterized in that, The tilt angle of the turbulent block (5) is in the range of 30-60 degrees.

Images