Label film two-way stretching forming device and method

Abstract

The invention discloses a label film two-way stretching forming device, and relates to the technical field of forming, the label film two-way stretching forming device comprises a bottom mounting plate, two first vertical plates are fixedly mounted on the bottom mounting plate, two second vertical plates and two third vertical plates are slidably mounted on the bottom mounting plate, and roll shafts are mounted on the first vertical plates, the second vertical plates and extrusion blocks; an extrusion block is slidably mounted on the first vertical plate, an extrusion connecting plate is fixedly mounted on the first vertical plate, the extrusion block and the extrusion connecting plate are tensioned through an extrusion spring, a first roll shaft and a second roll shaft are mounted on the first vertical plate, the second roll shaft is extruded through the extrusion block, the second roll shaft extrudes a label film, and a transverse stretching assembly is mounted on the bottom mounting plate. The label film is pulled out from the position between the first roller shaft and the second roller shaft, the label film can be longitudinally stretched while being pulled through different pressure set by the extrusion springs, the stretching length can be controlled by replacing different extrusion springs, and the stretching length can also be controlled by controlling the speed of pulling the label film.

Description

Technical Field

[0001] The present invention relates to the field of forming technology, and particularly to a device and method for biaxial stretching and forming of a label film. Background Art

[0002] In the fields of packaging, electronics, and medical treatment, label films are widely used due to their excellent printing applicability, mechanical strength, and dimensional stability. The traditional production of label films mainly adopts the uniaxial stretching process, but the films prepared thereby have anisotropy problems, resulting in defects such as insufficient transverse strength and uneven thermal shrinkage rate, and it is difficult to meet the requirements for material property uniformity in high-end application scenarios. The biaxial stretching technology can improve the mechanical properties, and the emergence of the synchronous biaxial stretching technology has greatly improved the mechanical balance of the film. However, limited by the temperature control accuracy and stretching synchronism at that time, there are still problems such as crystal point defects and edge cracking in the products. After entering the 21st century, with the application of technologies such as linear motor drive and infrared on-line thickness measurement, the control accuracy of biaxial stretching equipment has been significantly improved. However, since most biaxial stretching adopts the differential speed method for stretching, that is, stretching is carried out by using the rotational speed difference between two roller shafts, it is difficult to control the stretching length. Summary of the Invention

[0003] In view of the above technical problems, the present invention discloses a device for biaxial stretching and forming of a label film, which includes a bottom mounting plate. Two first vertical plates are fixedly installed on the bottom mounting plate. Two second vertical plates and two third vertical plates are slidably installed on the bottom mounting plate. Roller shafts are installed on the first vertical plates, the second vertical plates, and the extrusion blocks. An extrusion block is slidably installed on the first vertical plate. An extrusion connection plate is fixedly installed on the first vertical plate. The extrusion block and the extrusion connection plate are tensioned by an extrusion spring. A first roller shaft and a second roller shaft are installed on the first vertical plate. The second roller shaft is extruded by the extrusion block, and the second roller shaft extrudes the label film. A transverse stretching assembly is installed on the bottom mounting plate. Through the above technical solution, the label film is pulled out between the first roller shaft and the second roller shaft, and different pressures set by the extrusion spring can longitudinally stretch the label film while being pulled, and the stretching length can be controlled by replacing different extrusion springs. The stretching length can also be controlled by controlling the speed of pulling the label film.

[0004] Further, an installation cap is slidably installed on the extrusion connection plate. The bottom of the installation cap is fixedly connected to the extrusion block. The extrusion spring is fixedly installed between the extrusion connection plate and the installation cap.

[0005] Furthermore, a third roller shaft and a fourth roller shaft are installed on the second vertical plate. A small air cylinder is fixedly installed on one side of the second vertical plate. A connecting ring is fixedly installed on the cylinder arm of the small air cylinder. The connecting ring is rotatably connected to the third roller shaft to drive the third roller shaft to move up and down. The third roller shaft is of a hollow structure. One end of the third roller shaft is connected with a ventilation pipe, and the ventilation pipe conducts hot steam into the third roller shaft. Through the above technical solution, the small air cylinder drives the third roller shaft to move up and down to control the pressing force on the label film. The label film is stretched by the third roller shaft and the fourth roller shaft. At the same time, the hot steam conducted through the ventilation pipe can eliminate the stress of the stretched label film and it is not easy to retract.

[0006] Furthermore, a driving rack is fixedly installed on the bottom of the bottom mounting plate. The cylinder arm of the driving rack is fixedly connected to the second vertical plate to drive the second vertical plate to slide on the bottom mounting plate. A driving motor is fixedly installed on the second vertical plate, and the driving motor drives the fourth roller shaft to rotate.

[0007] Furthermore, a fifth roller shaft and a sixth roller shaft are installed on the third vertical plate. A driving rack is fixedly installed on the bottom of the third vertical plate. A driving gear is fixedly installed on the fourth roller shaft, and the driving gear meshes with the driving rack. Through the above technical solution, the stretched label film is located between the second vertical plate and the third vertical plate, ensuring that it is always in a straightened state to avoid retraction of the label film. At the same time, after the stretching is completed, the second vertical plate can move back and forth between the third vertical plate and the first vertical plate to further press the label film and eliminate stress.

[0008] Furthermore, the transverse stretching assembly includes side sliding plates. The side sliding plates are fixedly connected to the second vertical plate and the third vertical plate. The side sliding plates are fixedly installed on the bottom mounting plate. A plurality of distance control air cylinders are fixedly installed on the side sliding plates. A side sliding plate is fixedly installed on the cylinder arm of the distance control air cylinder, and a clamping assembly is installed on the side sliding plate.

[0009] Furthermore, the clamping assembly includes a clamping electric cylinder. The clamping electric cylinder is fixedly installed on the side sliding plate. A vertical driving plate is fixedly installed on the cylinder arm of the clamping electric cylinder. An upper clamping plate and a lower clamping plate are hinged at the upper and lower ends of the side sliding plate, and the clamping electric cylinder drives the upper clamping plate and the lower clamping plate to clamp the label film.

[0010] Furthermore, matching rods are fixedly installed at the upper and lower ends of the vertical driving plate. Second independent motors are fixedly installed on the upper clamping plate and the lower clamping plate. Clamping long holes are arranged in the second independent motors, and the matching rods move in cooperation in the clamping long holes.

[0011] Further, a plurality of position sensors are arranged on the side sliding plate. When the third roller shaft and the fourth roller shaft pass through the position sensors, the clamping components at the corresponding positions retract. Through the above technical solution, arranging a plurality of transverse stretching components can stretch different positions of the label film. At the same time, during the reciprocating sliding of the second vertical plate, when it reaches the corresponding position sensor, the clamping component loosens to avoid interference with the third roller shaft and the fourth roller shaft. At the same time, the third roller shaft and the fourth roller shaft can further press and eliminate the stress of the label film clamped between the driving rack and the third vertical plate.

[0012] A method for biaxially stretching and forming a label film includes the following steps: Step 1, longitudinal stretching: Stretch the label film and eliminate stress during the stretching process.

[0013] Step 2, eliminate stress again after stretching.

[0014] Step 3, transverse stretching: Perform transverse stretching through the transverse stretching components.

[0015] Step 4, eliminate stress on the label film after transverse stretching again.

[0016] The beneficial effects of the present invention compared with the prior art are: (1) Through the technical solution of the present invention, the label film is pulled out between the first roller shaft and the second roller shaft. The different pressures set by the extrusion springs can longitudinally stretch the label film while being pulled, and the stretching length can be controlled by replacing different extrusion springs. The stretching length can also be controlled by controlling the pulling speed of the label film.

[0017] (2) Through the technical solution of the present invention, the small air cylinder drives the third roller shaft to move up and down to control the pressing force on the label film. The third roller shaft and the fourth roller shaft drive the label film to be stretched. At the same time, passing hot steam through the ventilation pipe can eliminate the stress of the stretched label film, and it is not easy to retract.

[0018] (3) Through the technical solution of the present invention, the stretched label film is located between the second vertical plate and the third vertical plate, ensuring that it is always in a straightened state to avoid the label film from retracting. At the same time, after stretching, the second vertical plate can reciprocate between the third vertical plate and the first vertical plate to further press the label film and eliminate stress.

[0019] (4) Through the technical solution of the present invention, arranging a plurality of transverse stretching components can stretch different positions of the label film. At the same time, during the reciprocating sliding of the second vertical plate, when it reaches the corresponding position sensor, the clamping component loosens to avoid interference with the third roller shaft and the fourth roller shaft. At the same time, the third roller shaft and the fourth roller shaft can further press and eliminate the stress of the label film clamped between the driving rack and the third vertical plate. Description of the Drawings

[0020] Figure 1 Schematic diagram of the overall structure of the embodiment of the present invention Figure 1 。

[0021] Figure 2 Schematic diagram of the overall structure of the embodiment of the present invention Figure 2 。

[0022] Figure 3 is Figure 2 an enlarged view of part A in

[0023] Figure 4 is Figure 2 an enlarged view of part B in

[0024] Figure 5 Schematic diagram of the transverse stretching assembly of the embodiment of the present invention Figure 1 。

[0025] Figure 6 Schematic diagram of the transverse stretching assembly of the embodiment of the present invention Figure 2 。

[0026] Figure 7 Schematic diagram of the transverse stretching assembly of the embodiment of the present invention Figure 3 。

[0027] Figure 8 is Figure 7 an enlarged view of part C in

[0028] Reference numerals in the drawings: 1 - bottom mounting plate; 2 - first vertical plate; 3 - first roller shaft; 4 - second roller shaft; 5 - mounting cap; 6 - compression spring; 7 - compression connecting plate; 8 - compression block; 9 - second vertical plate; 10 - small air cylinder; 11 - connecting ring; 12 - ventilation pipe; 13 - drive motor; 14 - drive gear; 15 - third roller shaft; 16 - fourth roller shaft; 17 - drive rack; 18 - third vertical plate; 19 - first independent motor; 20 - second independent motor; 21 - fifth roller shaft; 22 - sixth roller shaft; 23 - side sliding plate; 24 - position sensor; 25 - distance control air cylinder; 26 - clamping electric cylinder; 27 - upper clamping plate; 28 - lower clamping plate; 29 - vertical drive plate; 30 - clamping connecting rod; 31 - transverse air cylinder; 32 - clamping long hole; 33 - fitting rod; 34 - connecting ear; 35 - support plate. Detailed implementation manners

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1-8 shown, a bidirectional stretching and forming device for a label film includes a bottom mounting plate 1, two first vertical plates 2 are fixedly installed on the bottom mounting plate 1, two second vertical plates 9 and two third vertical plates 18 are slidably installed on the bottom mounting plate 1. Rollers are installed on the first vertical plate 2, the second vertical plate 9, and the extrusion block 8. There are a total of three sets of roller assemblies, one for clamping, one for stretching, and one for moving back and forth to eliminate stress. And a transverse stretching assembly is provided to perform transverse stretching again after longitudinal stretching, and then stress elimination is performed again.

[0031] In this embodiment, an extrusion block 8 is slidably installed on the first vertical plate 2, an extrusion connection plate 7 is fixedly installed on the first vertical plate 2, and the extrusion block 8 and the extrusion connection plate 7 are tensioned by an extrusion spring 6. A first roller 3 and a second roller 4 are installed on the first vertical plate 2. This is the first set of roller assemblies. The second roller 4 is extruded by the extrusion block 8, and the second roller 4 extrudes the label film. A transverse stretching assembly is installed on the bottom mounting plate 1. The label film is pulled out between the first roller 3 and the second roller 4, and different pressures set by the extrusion spring 6 can longitudinally stretch the label film while being pulled, and the stretching length can be controlled by replacing different extrusion springs 6. Controlling the speed of pulling the label film can also control the stretching length. An installation cap 5 is slidably installed on the extrusion connection plate 7, the bottom of the installation cap 5 is fixedly connected to the extrusion block 8, and the extrusion spring 6 is fixedly installed between the extrusion connection plate 7 and the installation cap 5. The extrusion block 8 is driven by the extrusion spring 6 to squeeze and rub the second roller 4. When the label film passes between the first roller 3 and the second roller 4, there will be a certain force, so the label film will be deformed and elongated when it is pulled out.

[0032] In this embodiment, a third roller shaft 15 and a fourth roller shaft 16 are installed on the second vertical plate 9. The second vertical plate 9 is for the second group of roller shaft assemblies. A small air cylinder 10 is fixedly installed on one side of the second vertical plate 9. A connecting ring 11 is fixedly installed on the cylinder arm of the small air cylinder 10. The connecting ring 11 is rotatably connected to the third roller shaft 15 to drive the third roller shaft 15 to move up and down. The third roller shaft 15 is of a hollow structure. One end of the third roller shaft 15 is connected with a ventilation pipe 12, and the ventilation pipe 12 conducts hot steam into the third roller shaft 15. The small air cylinder 10 driving the third roller shaft 15 to move up and down can control the pressing force on the label film. The label film is driven by the third roller shaft 15 and the fourth roller shaft 16 to be stretched. At the same time, the stress of the stretched label film can be eliminated by conducting hot steam through the ventilation pipe 12, and it is not easy to retract. The small air cylinder 10 drives the third roller shaft 15 and the fourth roller shaft 16 to press the label film, and then rolls to drive the label film to be pulled out from between the first roller shaft 3 and the second roller shaft 4. At the same time, the ventilation pipe 12 conducts steam, and the stress can be eliminated while being pulled out.

[0033] In this embodiment, a driving rack 17 is fixedly installed at the bottom of the bottom mounting plate 1. The cylinder arm of the driving rack 17 is fixedly connected to the second vertical plate 9 to drive the second vertical plate 9 to slide on the bottom mounting plate 1. A driving motor 13 is fixedly installed on the second vertical plate 9, and the driving motor 13 drives the fourth roller shaft 16 to rotate.

[0034] In this embodiment, a fifth roller shaft 21 and a sixth roller shaft 22 are installed on the third vertical plate 18. This is the third group of roller shaft assemblies. The fifth roller shaft 21 and the sixth roller shaft 22 are respectively driven to rotate by a first independent motor 19 and a second independent motor 20. A driving rack 17 is fixedly installed at the bottom of the third vertical plate 18. A driving gear 14 is fixedly installed on the fourth roller shaft 16, and the driving gear 14 meshes with the driving rack 17. The stretched label film is located between the second vertical plate 9 and the third vertical plate 18 to ensure that it is always in a straightened state to avoid the label film from retracting. At the same time, after the stretching is completed, the second vertical plate 9 can move back and forth between the third vertical plate 18 and the first vertical plate 2 to further press the label film and eliminate stress. When the driving motor 13 drives the third roller shaft 15 and the fourth roller shaft 16 to pull out the label film, it simultaneously drives the driving gear 14 to rotate. The driving gear 14 drives the driving rack 17 and the third vertical plate 18 to move. The diameter of the driving gear 14 is equal to that of the fourth roller shaft 16, that is, the linear velocity is the same, so that the speed of the label film coming out of the third roller shaft 15 and the fourth roller shaft 16 is the same as the speed of the movement of the third vertical plate 18, and the label film can always be kept taut.

[0035] In this embodiment, the lateral stretching assembly includes a side sliding plate 23. The side sliding plate 23 is fixed to the bottom mounting plate 1 through a support plate 35. The side sliding plate 23 is fixedly connected to the second vertical plate 9 and the third vertical plate 18. A plurality of distance control cylinders 25 are fixedly installed on the side sliding plate 23. The cylinder arms of the distance control cylinders 25 are fixedly installed on the side sliding plate 23, and a clamping assembly is installed on the side sliding plate 23.

[0036] In this embodiment, the clamping assembly includes a clamping electric cylinder 26. The clamping electric cylinder 26 is fixedly installed on the side sliding plate 23. A vertical driving plate 29 is fixedly installed on the cylinder arm of the clamping electric cylinder 26. The upper clamping plate 27 and the lower clamping plate 28 are hinged to the upper and lower ends of the side sliding plate 23 respectively. The clamping electric cylinder 26 drives the upper clamping plate 27 and the lower clamping plate 28 to clamp the label film. At the upper and lower ends of the vertical driving plate 29, matching rods 33 are fixedly installed. Second independent motors 20 are fixedly installed on the upper clamping plate 27 and the lower clamping plate 28. Clamping long holes 32 are arranged inside the second independent motors 20. The matching rods 33 are movably matched inside the clamping long holes 32. A plurality of position sensors 24 are arranged on the side sliding plate 23. When the third roller 15 and the fourth roller 16 pass by the position sensors 24, the clamping assemblies at the corresponding positions retract. Through the above technical solution, setting a plurality of lateral stretching assemblies can stretch different positions of the label film. At the same time, during the reciprocating sliding of the second vertical plate 9, when reaching the corresponding position sensors 24, the clamping assemblies loosen to avoid interference with the third roller 15 and the fourth roller 16. At the same time, the third roller 15 and the fourth roller 16 can further press and eliminate the stress of the label film clamped between the driving rack 17 and the third vertical plate 18.

[0037] On the other hand, the present invention also provides a method for bidirectional stretching and forming of a label film, which includes the following steps: Step 1, longitudinal stretching, stretching the label film and eliminating stress during the stretching process.

[0038] Step 2, eliminating stress again after stretching.

[0039] Step 3, lateral stretching, performing lateral stretching through the lateral stretching assembly.

[0040] Step 4, eliminating stress on the laterally stretched label film again.

[0041] Working principle: First, place the manufactured label film sheet between the first roller 3 and the second roller 4. Drive the mounting cap 5 and the extrusion block 8 through the extrusion spring 6 to press the second roller 4 tightly. The second roller 4 will press the label film on the first roller 3. At this time, just select the extrusion spring 6 with appropriate force. Then, pass the label film through the third roller 15, the fourth roller 16, the fifth roller 21, and the sixth roller 22. Start the drive motor 13. In the initial state, both the second vertical plate 9 and the third vertical plate 18 are located close to the first vertical plate 2. Subsequently, start working. The drive motor 13 drives the third roller 15 and the fourth roller 16 to rotate and at the same time drives the third vertical plate 18 to move through the drive gear 14. The label film between the third vertical plate 18 and the second vertical plate 9 remains taut. The speed at which the label film comes out between the third roller 15 and the fourth roller 16 is the same as the moving speed of the third vertical plate 18. Stop when the third vertical plate 18 moves to the specified position, and the drive motor 13 also stops. Start the distance control cylinder 25 to drive the clamping assembly to reach the edge of the label film, and drive the upper clamping plate 27 and the lower clamping plate 28 to clamp the label film through the clamping electric cylinder 26. The width of the label film is smaller than the width of the roller. Then, retract the distance control cylinder 25 to finally stretch the label film to the same width as the roller. However, at this time, since the upper clamping plate 27 and the lower clamping plate 28 need to clamp the label film, they will interfere during the movement of the third roller 15 and the fourth roller 16. At this time, as long as the third roller 15 and the fourth roller 16 trigger the position sensor 24 before passing through the corresponding clamping assembly, drive the corresponding clamping assembly to release the film, and the distance control cylinder 25 retracts to avoid interference. Then, the third roller 15 and the fourth roller 16 pass through. The second vertical plate 9 moves back and forth to eliminate stress. During the movement of the second vertical plate 9, the small cylinder 10 controls the height of the third roller 15 so that the third roller 15 contacts the film but does not press it tightly. Therefore, the film will not be driven during the movement of the second vertical plate 9.

[0042] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A label film biaxial stretching forming device, characterized in that: The invention comprises a bottom mounting plate (1), two first vertical plates (2) are fixedly mounted on the bottom mounting plate (1), two second vertical plates (9) and two third vertical plates (18) are slidably mounted on the bottom mounting plate (1), rollers are mounted on the first vertical plate (2), the second vertical plate (9) and the extrusion block (8), the first vertical plate (2) is slidably mounted with an extrusion block (8), an extrusion connecting plate (7) is fixedly mounted on the first vertical plate (2), the extrusion block (8) and the extrusion connecting plate (7) are tensioned by an extrusion spring (6), a first roller (3) and a second roller (4) are mounted on the first vertical plate (2), the second roller (4) is extruded by the extrusion block (8), and the second roller (4) extrudes the label film, and a transverse stretching component is mounted on the bottom mounting plate (1).

2. A label film biaxial stretching forming device according to claim 1, characterized in that: A mounting cap (5) is slidably mounted on the extrusion connection plate (7), the bottom of the mounting cap (5) is fixedly connected to the extrusion block (8), and the extrusion spring (6) is fixedly mounted between the extrusion connection plate (7) and the mounting cap (5).

3. A label film biaxial stretching forming device according to claim 2, characterized in that: The second vertical plate (9) is provided with a third roller (15) and a fourth roller (16); a small cylinder (10) is fixedly mounted on one side of the second vertical plate (9); a connecting ring (11) is fixedly mounted on the cylinder arm of the small cylinder (10); the connecting ring (11) is rotatably connected to the third roller (15) to drive the third roller (15) to move up and down; the third roller (15) is a hollow structure; one end of the third roller (15) is connected to a ventilation pipe (12); the ventilation pipe (12) passes hot steam into the third roller (15).

4. A label film biaxial stretching forming device according to claim 3, characterized in that: A driving rack (17) is fixedly mounted on the bottom of the bottom mounting plate (1); a cylinder arm of the driving rack (17) is fixedly connected to the second vertical plate (9) to drive the second vertical plate (9) to slide on the bottom mounting plate (1); a driving motor (13) is fixedly mounted on the second vertical plate (9); and the driving motor (13) drives the fourth roller (16) to rotate.

5. The label film biaxial stretching forming device according to claim 4, characterized in that: The third vertical plate (18) is provided with a fifth roller (21) and a sixth roller (22), a driving rack (17) is fixedly mounted on the bottom of the third vertical plate (18), and a driving gear (14) is fixedly mounted on the fourth roller (16), the driving gear (14) being meshed with the driving rack (17).

6. The label film biaxial stretching forming device according to claim 1, characterized in that: The transverse stretching assembly comprises a side sliding plate (23), the side sliding plate (23) being fixedly connected to the second vertical plate (9) and the third vertical plate (18), the side sliding plate (23) being fixedly mounted on the bottom mounting plate (1), a plurality of distance control cylinders (25) being fixedly mounted on the side sliding plate (23), the cylinder arms of the distance control cylinders (25) being fixedly mounted with the side sliding plates (23), and a clamping assembly being mounted on the side sliding plate (23).

7. A label film biaxial stretching forming device according to claim 6, characterized in that: The clamping assembly comprises a clamping electric cylinder (26), the clamping electric cylinder (26) is fixedly mounted on the side sliding plate (23), a vertical driving plate (29) is fixedly mounted on the cylinder arm of the clamping electric cylinder (26), an upper clamping plate (27) and a lower clamping plate (28) are hingedly connected at the upper and lower ends of the side sliding plate (23), and the clamping electric cylinder (26) drives the upper clamping plate (27) and the lower clamping plate (28) to clamp the label film.

8. The label film biaxial stretching forming device according to claim 7, characterized in that: The upper and lower ends of the vertical drive plate (29) are fixedly provided with matching rods (33); the upper clamping plate (27) and the lower clamping plate (28) are fixedly provided with a second independent motor (20); a clamping long hole (32) is provided in the second independent motor (20); and the matching rod (33) moves in the clamping long hole (32).

9. The label film biaxial stretching forming device according to claim 8, characterized in that: A plurality of position sensors (24) are provided on the side sliding plate (23), and when the third roller (15) and the fourth roller (16) pass the position sensors (24), the clamping components at corresponding positions are retracted.

10. A label film biaxial stretching molding method using the device as claimed in claim 1, characterized in that: The steps include: Step 1: longitudinal stretching, stretching the label film and eliminating stress during the stretching process; Step 2, eliminating stress again after stretching; Step 3: lateral stretching: lateral stretching is performed by a lateral stretching component; Step 4: Re-stress the label film after transverse stretching.

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