High-luminosity low-shrinkage calendered PVC (polyvinyl chloride) film production equipment and process

Abstract

The invention provides high-luminosity low-shrinkage calendered PVC film production equipment and process, and relates to the technical field of PVC film production. The high-luminosity low-shrinkage calendered PVC film production equipment comprises a stripping machine box and an extruder, a transfer box is arranged on the side, away from the extruder, of the stripping machine box, the top of the transfer box fixedly communicates with an air outlet plate, and folding mechanisms used for adjusting the air outlet area are symmetrically installed in the transfer box; a U-shaped mounting frame is slidably connected to the inner side of the stripping machine box, a sand-containing rubber wheel is rotatably connected to the inner side of the U-shaped mounting frame, and a mirror surface steel wheel is arranged under the sand-containing rubber wheel. Through the design, the PVC film is coated on the 1 / 8 area of the sand-containing rubber wheel after being embossed and then stripped, and the original method that the PVC film is stripped from the mirror surface wheel is changed, so that the shrinkage rate of a finished product is reduced, the surface is smoother, the luminosity is higher, the brightness of the product is higher, the product is brighter through visual inspection, and the black product is more black and brighter.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of PVC film production, in particular to a high-gloss low-shrinkage calender PVC film production equipment and process. BACKGROUND

[0002] PVC film (also known as polyvinyl chloride hard film) is widely used in packaging, advertising printing, medical devices, building decoration and other fields. PVC film is made by mixing PVC with additives, plasticizing, mixing, extruding, cooling and shaping, pulling and winding, and cutting and packaging, using three or four roll calender to form a transparent or colored film of a specified thickness, and processing into a calendered film. It can also be used to make packaging bags, raincoats, tablecloths, curtains, etc. by cutting, heat sealing. Wide transparent film can be used for greenhouses, plastic greenhouses and mulch. With the wide application of PVC film, its market size is expanding, and product demand is increasing.

[0003] However, the production of existing high-gloss calendered PVC film is through the fine matte extrusion of PVC calendered film by mirror steel wheel and sand-containing rubber wheel, the temperature of the mirror steel wheel is raised, the temperature of the sand-containing rubber wheel is lowered, the calendered PVC film is shaped at a certain covering angle on the mirror steel wheel, and then peeled off. The PVC film is in a softened state above 140℃ and has a certain adhesion with the mirror steel wheel. The peeling process will produce a certain stretching, which will increase the shrinkage of the PVC film after cooling. At the same time, this stretching also stretches the PVC film on the mirror wheel to form a mirror smooth surface (not yet shaped), which reduces the surface smoothness and the gloss of the product surface.

[0004] Therefore, we have developed a new high-gloss low-shrinkage calender PVC film production equipment and process. SUMMARY

[0005] (I) Technical problems solved In view of the shortcomings of the prior art, the present application provides a high-gloss low-shrinkage calender PVC film production equipment and process, which solves the problem of the existing high-gloss calendered PVC film production, which is through the fine matte extrusion of PVC calendered film by mirror steel wheel and sand-containing rubber wheel, the temperature of the mirror steel wheel is raised, the temperature of the sand-containing rubber wheel is lowered, the calendered PVC film is shaped at a certain covering angle on the mirror steel wheel, and then peeled off. The PVC film is in a softened state above 140℃ and has a certain adhesion with the mirror steel wheel. The peeling process will produce a certain stretching, which will increase the shrinkage of the PVC film after cooling. At the same time, this stretching also stretches the PVC film on the mirror wheel to form a mirror smooth surface (not yet shaped), which reduces the surface smoothness and the gloss of the product surface.

[0006] (II) Technical scheme In order to achieve the above object, the present application is realized by the following technical scheme: a high-gloss low-shrinkage calendered PVC film production equipment, comprising a stripping machine box and an extruder, a transfer box is arranged on the side away from the extruder of the stripping machine box, an air outlet plate is fixedly connected to the top of the transfer box, and a folding mechanism for adjusting the air outlet area is symmetrically installed in the transfer box. A U-shaped mounting bracket is slidably connected to the inner side of the stripping machine box, a sand-containing rubber wheel is rotatably connected to the inner side of the U-shaped mounting bracket, a mirror surface steel wheel is arranged directly below the sand-containing rubber wheel, a plurality of first guide rollers are arranged on the side close to the extruder of the mirror surface steel wheel, and a plurality of second guide rollers are arranged on the side away from the extruder of the sand-containing rubber wheel.

[0007] Preferably, the folding mechanism comprises a folding baffle fixedly connected to the inner side of the transfer box, the folding baffle comprises two first V-shaped plates and second V-shaped plates hingedly connected, guide rods are fixedly connected to the front side and the rear side of the first V-shaped plate and the second V-shaped plate, one end of the two guide rods corresponding to the first V-shaped plate is fixed to the inner side of the transfer box, and the two guide rods corresponding to the second V-shaped plate are slidably connected with the side wall of the transfer box.

[0008] Preferably, a sliding groove is formed in the side wall of the transfer box, the guide rods penetrate the transfer box through the sliding groove, and folding blades are fixedly connected to the outer surface of the guide rods, the outer surface of the folding blades is slidably connected with the inner wall of the sliding groove.

[0009] Preferably, the top of the outer surface front side and the outer surface rear side of the stripping machine box is fixedly connected with a side plate, a gas cylinder is fixedly installed on the upper surface of each of the two side plates, a mounting plate is fixedly connected to the piston end of each of the two gas cylinders, and the opposite sides of the two mounting plates are fixedly connected to the front side and the rear side of the U-shaped mounting bracket, respectively. Preferably, a notch matching the U-shaped mounting bracket is formed in the top of the stripping machine box.

[0010] Preferably, a plurality of rotating shafts are symmetrically rotatably connected to the front side and the rear side of the inner wall of the stripping machine box, the rotating shafts corresponding to every two positions constitute a group, and the first guide roller, the mirror surface steel wheel and the second guide roller are respectively fixedly connected to one end of the rotating shafts close to each other in the plurality of groups.

[0011] Preferably, a calendering machine is arranged between the extruder and the stripping machine box, a discharge nozzle is fixedly connected to one end of the extruder close to the calendering machine, and a hopper is fixedly connected to the top of the other end of the extruder away from the calendering machine.

[0012] Preferably, a support seat is arranged on the side of the transfer box away from the stripping machine box, and a winding roller is rotatably connected to the top of the support seat.

[0013] Preferably, one side of the outer surface of the transfer box is fixedly connected with an air pipe, one end of the air pipe is fixedly installed with a fan, and the upper surface of the air outlet plate is provided with a plurality of air outlet holes matched with the air pipe.

[0014] The application also provides a production process of high-gloss and low-shrinkage calendered PVC film, which comprises the following specific steps. Step one, first, take PVC resin powder, calcium powder, plasticizer, stabilizer and colorant in a specific proportion, stir them and then put them into a hopper, and then convey them into an extruder to extrude the PVC film material in a molten state under pressure and temperature rise; Step two, then pass the raw material through a calender to perform calendering operation on the PVC film material to process it to the required thickness, and then make the calendered PVC film material enter a stripping machine box and sequentially pass through the guidance of a first guide roller, strip off from the fine matte surface of the sand-containing rubber wheel, and then pass through the guidance of a second guide roller. Step three, then the stripped PVC film material is cooled by the air outlet plate and is pulled by a winding roller to be wound on the upper part of the winding roller to complete a winding operation, and finally the finished product of the calendered PVC film with high gloss and low shrinkage is obtained.

[0015] (Three) beneficial effects The application provides a production equipment and process of high-gloss and low-shrinkage calendered PVC film. 1. The production equipment and process of high-gloss and low-shrinkage calendered PVC film, by design, makes the PVC film strip off after being wrapped on 1 / 8 area of the sand-containing rubber wheel after embossing, changes the original method of stripping the PVC film from the mirror surface wheel, reduces the shrinkage rate of the finished product, makes the surface smoother, the gloss brighter, the product brighter, and the black product darker and brighter.

[0016] 2. The production equipment and process of high-gloss and low-shrinkage calendered PVC film, by design of the transfer box, air pipe and folding mechanism, the fan blows the external cold air upward through the air outlet plate and air outlet hole, which can first resist the reverse force of the downward PVC film to ensure that it will not be downward by gravity, and according to the different widths of the calendered PVC film, the overall folding baffle occupies the adjustable cross-sectional area of the top of the transfer box, so that the blowing width is adjustable, the uniformity of the air outlet is ensured, and the air outlet deviation is avoided to be too large to easily cause the corrugation of the film. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a stripping process diagram of the PVC film material in the prior art; Figure 2 It is a schematic diagram of the overall structure of the application; Figure 3 It is a schematic diagram of the structure of the stripping machine box of the application; Figure 4 This is a schematic diagram of the internal installation of the stripping casing of the present invention; Figure 5 This is a schematic diagram of the installation of the U-shaped mounting bracket and the sand-containing rubber wheel of the present invention; Figure 6 This is a schematic diagram of the folding mechanism of the present invention; Figure 7 This is a schematic diagram of the structure of the folding blade of the present invention.

[0018] The components include: 1. Extruder; 2. Hopper; 3. Discharge nozzle; 4. Calender; 5. Peeling housing; 6. Rotary shaft; 7. First guide roller; 8. Mirror steel wheel; 9. Second guide roller; 10. Sand-containing rubber wheel; 11. Side plate; 12. Cylinder; 13. Mounting plate; 14. U-shaped mounting bracket; 15. Groove; 16. Transfer box; 17. Air outlet plate; 18. Air outlet hole; 19. Fan; 20. Air pipe; 21. Folding baffle; 2101. Guide rod; 2102. First V-shaped plate; 2103. Second V-shaped plate; 22. Slide groove; 23. Folding blade; 24. Support seat; 25. Take-up roller. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Examples, such as Figures 1-7 As shown, this embodiment of the invention provides a high-gloss, low-shrinkage calendered PVC film production equipment, including a peeling machine box 5 and an extruder 1. The peeling machine box 5 is provided with a transfer box 16 on the side away from the extruder 1. An air outlet plate 17 is fixedly connected to the top of the transfer box 16, and a folding mechanism for adjusting the air outlet area is symmetrically installed inside the transfer box 16. A U-shaped mounting frame 14 is slidably connected to the inner side of the peeling machine housing 5. A sand-containing rubber wheel 10 is rotatably connected to the inner side of the U-shaped mounting frame 14. A mirror steel wheel 8 is arranged directly below the sand-containing rubber wheel 10. Multiple first guide rollers 7 are arranged on the side of the mirror steel wheel 8 close to the extruder 1, and multiple second guide rollers 9 are arranged on the side of the sand-containing rubber wheel 10 away from the extruder 1. Side plates 11 are fixedly connected to the top of the front and rear sides of the outer surface of the peeling machine housing 5. Cylinders 12 are fixedly installed on the upper surface of the two side plates 11. Mounting plates 13 are fixedly connected to the piston ends of the two cylinders 12. The opposite sides of the two mounting plates 13 are fixedly connected to the front and rear sides of the U-shaped mounting frame 14, respectively. Correspondingly, a slot 15 matching the U-shaped mounting frame 14 is opened on the top of the peeling machine housing 5. The operation of the cylinder 12 can drive the piston end mounting plate 13 to rise and fall, thereby driving the U-shaped mounting frame 14 and the sand-containing rubber wheel 10 to rise and fall. Correspondingly, multiple rotating shafts 6 are symmetrically rotatably connected to the front and rear sides of the inner wall of the stripping machine housing 5. Each pair of rotating shafts 6 in corresponding positions forms a group, and the first guide roller 7, the mirror steel wheel 8, and the second guide roller 9 are respectively fixedly connected to one end of the multiple groups of rotating shafts 6 that are close to each other. Among them, the temperature of the sand-impregnated rubber wheel 10 and the mirror-finished steel wheel 8 is controllable (existing technology). Furthermore, by changing the temperature control method of the sand-impregnated rubber wheel 10 and the mirror-finished steel wheel 8, the effects of shrinkage and gloss reduction caused by stretching can be avoided and reduced. Compared to... Figure 1 Compared with traditional stripping methods, the technical solution of this application has yielded the following conclusions through experiments: The technical solution of this application changes the original method of peeling the PVC film from the mirror steel wheel to peeling it from the fine matte surface of the abrasive rubber wheel 10. Because it is peeled from the fine matte surface of the rubber wheel, which has a certain roughness and numerous and densely distributed capillaries, the peeling tensile force is significantly reduced and much lower than that from the mirror steel wheel (reflected in the stretching ratio). This results in a significant decrease in the stretching ratio of the PVC film (from 11.26% to 7.26%, a decrease of 35%). The decrease in stretching also leads to a proportional reduction in surface deformation. The gloss of the calendered PVC film produced by this process is increased by 8% (60%), an increase of 10%, and the shrinkage rate is reduced by 0.5-1.0% (compared to a decrease of 20-40%). In black high-gloss products, the increased gloss makes the products produced by this new process appear darker and shinier, significantly more advanced, and the L value, which reflects the lightness and darkness in the color difference value, is increased by 0.56.

[0021] And calender 4 is arranged between the extruder 1 and the stripping machine box 5, and the extruder 1 is fixedly connected with the discharge nozzle 3 close to one end of the calender 4, and the top of the end of the extruder 1 away from the calender 4 is fixedly connected with the hopper 2, the raw materials entering the hopper 2 are heated by the extruder 1, and then extruded through the discharge nozzle 3, and then calendered through the calender 4.

[0022] Meanwhile, the support seat 24 is arranged on the side of the transfer box 16 away from the stripping machine box 5, the top of the support seat 24 is rotatably connected with the winding roller 25, one end of the winding roller 25 is fixedly connected with the output shaft of the external servo motor, and the winding roller 25 is used for winding the PVC film material after calendering and stripping, realizing the function of collecting the final finished product PVC film material.

[0023] And the folding mechanism includes a folding baffle 21 fixedly connected to the inner side of the transfer box 16, the folding baffle 21 includes two first V-shaped plates 2102 and second V-shaped plates 2103 hingedly connected, the front side and the rear side of the first V-shaped plate 2102 and the second V-shaped plate 2103 are symmetrically fixedly connected with the guide rod 2101, one end of the two guide rods 2101 corresponding to the first V-shaped plate 2102 is fixed to the inner side of the transfer box 16, and the two guide rods 2101 corresponding to the second V-shaped plate 2103 are slidably connected with the side wall of the transfer box 16. Among them, the first V-shaped plate 2102 and the second V-shaped plate 2103 are also composed of two hingedly connected branch plates, so that each of them can be folded, and the folding baffle 21 composed of the two can also be folded, so that the overall folding baffle 21 occupies different sizes of the cross-sectional area of the top of the transfer box 16. And the side wall of the transfer box 16 is provided with a sliding groove 22, the guide rod 2101 penetrates the transfer box 16 through the sliding groove 22, and the outer surface of the guide rod 2101 is fixedly connected with the folding blade 23, the outer surface of the folding blade 23 is slidably connected with the inner wall of the sliding groove 22, and the two ends of the folding blade 23 are fixedly connected with the inner wall of the sliding groove 22, so that when the guide rod 2101 moves, one side of the folding blade 23 will unfold along with the guide rod 2101, and the other side will fold more tightly along with the movement of the guide rod 2101, so as to ensure the movement effect of the guide rod 2101 while achieving the sealing effect of the side of the entire transfer box 16.

[0024] And the outer surface of the transfer box 16 is fixedly connected with the air pipe 20, one end of the air pipe 20 is fixedly connected with the fan 19, and the upper surface of the air outlet plate 17 is provided with a plurality of air outlet holes 18 matched with the air pipe 20, and the fan 19 draws cold air from the outside into the inside of the transfer box 16 through the air pipe 20 (wherein the air inlet pipe of the fan 19 can be connected with the external cold air source), so as to blow upward through the air outlet holes 18 on the surface of the air outlet plate 17, so as to cool and cool the stripped PVC film material.

[0025] The application also provides a production process of high-gloss and low-shrinkage calendered PVC film, which comprises the following specific steps. Step one, first, take PVC resin powder, calcium powder, plasticizer, stabilizer and colorant in a specific proportion, stir them and then put them into the hopper 2, and then convey them to the extruder 1 to extrude the PVC film material in a molten state under pressure and temperature rise; Step two, then pass the raw material through the calender 4 to perform calendering operation on the PVC film material to process it to the required thickness, and then the calendered PVC film material enters the stripping machine box 5 and is guided by the first guide roller 7, stripped from the fine matte surface of the sand-containing rubber wheel 10, and then guided by the second guide roller 9; Step three, then the stripped PVC film material is cooled by the air outlet plate 17 and is pulled by the winding roller 25, wound to the upper part of the winding roller 25, and one winding operation is completed, and the finished product of the calendered PVC film with high gloss and low shrinkage is obtained; Among them, the fan 19 blows the external cold air upward through the air outlet plate 17 and the air outlet hole 18, which can first resist the reverse force of the downward sag of the PVC film, ensure that it will not sag under gravity, and according to the different widths of the calendered PVC film, the overall folding baffle 21 occupies the size of the cross-sectional area of the top of the transfer box 16, so that the blowing width can be adjusted, the uniformity of the air outlet is ensured, and the large deviation of the air outlet is avoided to prevent the film from appearing corrugated.

[0026] In summary, the technical scheme adopts the reverse embossing method, and by adjusting the temperature of the mirror steel wheel and the sand-containing rubber wheel, the PVC film is coated on the sand-containing rubber wheel after embossing and then stripped out, the PVC film with a temperature as high as 140°C or above is contacted with the mirror wheel (Ra=0.02-0.03um) and the sand-containing rubber wheel (Ra=2.8-3.0um) under the pressure (adjustable) and the weight of the sand-containing rubber wheel, the mirror effect of one side of the product and the matte effect of the other side are realized, at the same time, the temperature of the sand-containing rubber wheel surface is controlled at 70-90°C and the temperature of the mirror steel wheel is lower than 40°C, the PVC film is coated on the sand-containing rubber wheel after embossing and then stripped out, the stretching speed difference from the mirror steel wheel (the stretching wheel speed is faster) is 6.1m / min, and the stretching speed difference from the sand-containing rubber wheel is only 3.8M / min, the small stretching speed difference (corresponding to the decrease of the stretching ratio and the corresponding stretching force, the unevenness of the PVC film mirror and the increase and enlargement of the small holes caused by stretching are reduced), which makes the surface smoother, the gloss brighter, the product brighter, and the product more bright and black in appearance.

[0027] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A high-gloss, low-shrinkage calendered PVC film production equipment, comprising a peeling machine (5) and an extruder (1), characterized in that, A transfer box (16) is provided on the side of the stripping machine box (5) away from the extruder (1). An air outlet plate (17) is fixedly connected to the top of the transfer box (16), and a folding mechanism for adjusting the air outlet area is symmetrically installed inside the transfer box (16). A U-shaped mounting bracket (14) is slidably connected to the inner side of the stripping housing (5). A sand-containing rubber wheel (10) is rotatably connected to the inner side of the U-shaped mounting bracket (14). A mirror steel wheel (8) is provided directly below the sand-containing rubber wheel (10). Multiple first guide rollers (7) are provided on the side of the mirror steel wheel (8) close to the extruder (1), and multiple second guide rollers (9) are provided on the side of the sand-containing rubber wheel (10) away from the extruder (1).

2. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: The folding mechanism includes a folding baffle (21) fixedly connected to the inside of the transfer box (16). The folding baffle (21) includes two hinged first V-shaped plates (2102) and second V-shaped plates (2103). Guide rods (2101) are symmetrically fixedly connected to the front and rear sides of the first V-shaped plates (2102) and the second V-shaped plates (2103). One end of the two guide rods (2101) corresponding to the first V-shaped plate (2102) is fixed to the inside of the transfer box (16). The two guide rods (2101) corresponding to the second V-shaped plate (2103) are slidably connected to the side wall of the transfer box (16).

3. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 2, characterized in that: The transfer box (16) has a sliding groove (22) on its side wall. The guide rod (2101) passes through the transfer box (16) through the sliding groove (22). A folding blade (23) is fixedly connected to the outer surface of the guide rod (2101). The outer surface of the folding blade (23) is slidably connected to the inner wall of the sliding groove (22).

4. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: Side plates (11) are fixedly connected to the top of the front and rear sides of the outer surface of the stripping machine housing (5). Cylinders (12) are fixedly installed on the upper surfaces of the two side plates (11). Mounting plates (13) are fixedly connected to the piston ends of the two cylinders (12). The opposite sides of the two mounting plates (13) are fixedly connected to the front and rear sides of the U-shaped mounting bracket (14).

5. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 4, characterized in that: The top of the stripping housing (5) is provided with a slot (15) that matches the U-shaped mounting bracket (14).

6. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: The front and rear sides of the inner wall of the stripping machine box (5) are symmetrically connected to multiple rotating shafts (6). Each pair of rotating shafts (6) in corresponding positions forms a group, and the first guide roller (7), the mirror steel wheel (8), and the second guide roller (9) are respectively fixedly connected to one end of the multiple groups of rotating shafts (6) that are close to each other.

7. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: A calender (4) is provided between the extruder (1) and the stripper box (5), and a discharge nozzle (3) is fixedly connected to one end of the extruder (1) near the calender (4), and a hopper (2) is fixedly connected to the top of the end of the extruder (1) away from the calender (4).

8. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: The transfer box (16) is provided with a support base (24) on the side away from the stripping machine box (5), and a take-up roller (25) is rotatably connected to the top of the support base (24).

9. The high-gloss, low-shrinkage calendered PVC film production equipment according to claim 1, characterized in that: One side of the outer surface of the transfer box (16) is fixedly connected to an air pipe (20), and a fan (19) is fixedly installed at one end of the air pipe (20). The upper surface of the air outlet plate (17) is provided with a number of air outlet holes (18) that cooperate with the air pipe (20).

10. A high-gloss, low-shrinkage calendered PVC film production process according to any one of claims 1-9, characterized in that, The specific steps include the following: Step 1: First, take PVC resin powder, calcium powder, plasticizer, stabilizer and colorant in a specific ratio, stir them and put them into hopper (2), and then transport them to extruder (1) for pressurization and heating to extrude molten PVC film material. Step 2: The raw material is then passed through the calender (4) to calender the PVC film to the required thickness. The calendered PVC film enters the peeling box (5) and is guided by the first guide roller (7) to peel off from the fine matte surface of the sand-containing rubber wheel (10), and then guided by the second guide roller (9). Step 3: The peeled PVC film will then be cooled by the air outlet plate (17) and pulled by the take-up roller (25) to be wound up to the top of the take-up roller (25), completing one winding operation and obtaining the final calendered PVC film with high gloss and low shrinkage.

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