Two-way stretching device for PET (Polyethylene Terephthalate) film

Abstract

The utility model discloses a PET (Polyethylene Terephthalate) film two-way stretching device, which comprises a conduction rack, a hot ironing assembly, a transverse stretching assembly and a calendering assembly, and is equipped with a compression roller and an output rotating roller, and the compression roller is in close contact with the surface of a conical roller sleeve, so that the stable transmission of a PET film is effectively ensured, and the poor sliding or loosening of a film material is avoided. Through accurate matching of the conical roller and the surface of the conical roller sleeve, pressure distribution in the transverse stretching process can be accurately controlled, and an efficient transverse stretching effect is provided. Besides, the two-way stretching structure designed by combining the rotating roller and the damping rotating roller integrally realizes accurate control in the longitudinal direction and the transverse direction, ensures that the stretching effect of the PET film is uniform and stable, and finally obtains a high-quality two-way stretching film. The PET film stretching device has the advantages of simple structure, remarkable stretching effect and the like, and can be widely applied to the PET film production process.

Description

TECHNICAL FIELD

[0001] The utility model relates to PET film processing technical field, concretely is a PET film bidirectional stretching device. BACKGROUND

[0002] The existing PET film bidirectional stretching device usually includes a plurality of roller systems, aiming at the longitudinal and transverse stretching of PET film to improve the strength and ductility of the film. The conventional PET film stretching equipment generally adopts a relatively simple structure, usually driven by compression rollers and guide rollers, while the transverse stretching is usually realized by frame clamping and air pressure inflation. In the longitudinal stretching process, the film is usually stretched by controlling the heating temperature and speed, while the transverse stretching relies on the passive guidance of the film between the rollers. However, these traditional devices often have some shortcomings, such as uneven film sliding, unstable film tension during stretching, and difficult to guarantee the transverse stretching precision, etc.

[0003] Unstable transmission and uneven stretching force: in the traditional stretching device, the design of compression rollers and guide rollers is relatively simple, which usually cannot well guarantee the smooth transmission of the film material, easily leading to poor film sliding or loosening, thereby affecting the stretching quality of the film. In addition, it cannot be equipped with transverse stretching effect, and the transverse stretching effect realized by frame clamping and air pressure inflation needs to be realized by intermittent stop operation.

[0004] Low precision of bidirectional stretching: the traditional bidirectional stretching structure, especially in the synergistic effect of longitudinal and transverse directions, is usually designed separately. The control of longitudinal and transverse stretching is relatively independent, lacking of integrated design, leading to poor uniformity and stability of stretching effect, and it is difficult to ensure that the film achieves the best stretching effect in both directions. The transverse stretching is difficult to accurately adjust and control, usually relying on air pressure or simple roller structure, which has certain limitations on the stretching effect and uniformity of the film material.

[0005] Therefore, the prior art has certain limitations in improving the stretching quality and control precision of PET film, especially in the film transmission stability, transverse stretching precision and comprehensive effect of bidirectional stretching, which is difficult to meet the needs of high-quality production. SUMMARY

[0006] The utility model aims at solving the technical problems existing in the prior art or related art.

[0007] In a possible implementation, the utility model provides a kind of PET film bidirectional stretching device, comprising: conducting frame, hot ironing subassembly, transverse stretching subassembly and calendering component and located in the damping roller and output roller of rotation installation in the inside of conducting frame, the top surface of conducting frame is placed with the pressure roller of transverse stretching subassembly surface abutment, the side of conducting frame is equipped with the drive mechanism for the rotation of fixed guide roller, transverse stretching subassembly and output roller, transverse stretching subassembly includes shaft and the taper roller sleeve of fixed sleeve on the surface of shaft, taper roller sleeve surface is equipped with curvature and is spindle-shaped, the surface of taper roller sleeve is equipped with extension edge, calendering component includes calendering roller, rotating lever seat and drive rod, rotating lever seat is rotationally installed on the surface of fixed guide roller and is rotationally connected with the output end of calendering roller and drive rod respectively, the other end of drive rod is movably installed on the surface of conducting frame, calendering roller is pasted with the surface of transverse stretching subassembly under the drive of drive rod, the both ends of damping roller are rotationally connected with the surface of conducting frame and are equipped with rotation damping.

[0008] In a possible implementation, the pressure roller is in close contact with the surface of the taper roller sleeve, ensuring smooth transmission of the PET film and effectively transmitting the stretching force. The spiral protrusions on the surface of the taper roller sleeve further enhance the distribution of the stretching force, allowing the PET film to maintain a stable tension during the stretching process and to uniformly expand. Furthermore, the close fit of the taper roller with the surface of the taper roller sleeve allows precise control of the pressure distribution during the transverse stretching process, ensuring optimal transverse stretching of the PET film.

[0009] In a possible implementation, the bidirectional stretching structure incorporating the rotating roller and the damping roller provides a synergistic effect of longitudinal and transverse stretching. By precisely controlling the stretching in the lengthwise and transverse directions, the utility model can effectively ensure that the stretching of the PET film is more uniform and stable, thereby obtaining high-quality bidirectional stretched film. The cooperation of the rotating roller and the damping roller optimizes the film material transmission during the stretching process, ensuring the stability and precision of the stretching.

[0010] Based on the above technical solutions, the PET film bidirectional stretching device of the utility model successfully overcomes the problems of uneven stretching and poor film material sliding in the prior art by combining the close contact of the pressure roller with the surface of the transverse stretching subassembly and the cooperation of the taper roller with the surface of the taper roller sleeve, providing stable transmission effect and precise stretching control. Through the integrated bidirectional stretching design, longitudinal and transverse stretching can be performed synergistically, ensuring that the stretching of the PET film is more uniform and stable, thereby significantly improving the quality of the PET film, especially the elongation and stretching effect in the lengthwise and transverse directions. The design of the utility model can be widely applied in the production process of PET film, improving production efficiency and film quality.

[0011] The utility model has the following beneficial effects:

[0012] 1. In this utility model, the pressure roller and the conical roller sleeve surface are in close contact, which ensures the smooth transmission of the PET film, avoids poor film material sliding or loosening, effectively transmits the tensile force of the stretching ridge, and through the close cooperation between the conical roller and the conical roller sleeve surface, accurately controls the pressure distribution during the transverse stretching process, providing a high-efficiency stretching effect.

[0013] 2. In this utility model, the biaxial stretching structure, which combines the design of the rotating roller and the damping roller, integrates the stretching action in both the longitudinal and transverse directions. Through precise control of the length stretching and transverse stretching, the stretching effect of the PET film is ensured to be more uniform and stable, and a high-quality biaxially stretched film is finally obtained. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the transmission frame according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the structure of a hot ironing assembly according to an embodiment of the present invention;

[0017] Figure 4 This is an exploded view of the hot ironing assembly according to an embodiment of the present invention;

[0018] Figure 5 This is a schematic diagram of the surface structure of the tapered roller sleeve according to an embodiment of the present invention.

[0019] Figure label:

[0020] 100. Conduction frame; 110. Fixed guide roller; 120. Pressure roller; 130. Damping roller; 140. Output roller;

[0021] 200, Ironing assembly; 210, Guide seat; 220, Guide roller; 230, Heating panel; 211, Slide groove hole;

[0022] 300. Transverse tensioning assembly; 310. Shaft; 320. Tapered roller sleeve; 321. Extension rib;

[0023] 400, calendering assembly; 410, calendering roll; 420, rotary bar seat; 430, drive rod; 411, extension groove. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0025] It is to be understood that the descriptions are only exemplary and are not intended to limit the scope of the present application.

[0026] The application will be described below with reference to the accompanying drawings. Figures 1-5 The PET film bidirectional stretching device provided by some embodiments of the application is described.

[0027] The PET film bidirectional stretching device comprises a conduction rack 100, a hot pressing assembly 200, a transverse stretching assembly 300, a calender assembly 400, a damping rotating roller 130 and an output rotating roller 140 which are rotatably installed on the inner side of the conduction rack 100, a compression roller 120 which is placed on the top surface of the conduction rack 100 and abuts against the surface of the transverse stretching assembly 300, a driving mechanism which is arranged on one side of the conduction rack 100 and is used for rotating the guide roller 110, the transverse stretching assembly 300 and the output rotating roller 140, the transverse stretching assembly 300 comprises a shaft 310 and a conical roller sleeve 320 which is fixedly sleeved on the surface of the shaft 310, the surface of the conical roller sleeve 320 is provided with a curvature in the shape of a spindle, and the surface of the conical roller sleeve 320 is provided with an extension edge 321, the calender assembly 400 comprises a calender roller 410, a rotating lever base 420 and a driving rod 430, the rotating lever base 420 is rotatably installed on the surface of the guide roller 110 and is rotatably connected with the output end of the calender roller 410 and the driving rod 430 at two ends respectively, the other end of the driving rod 430 is movably installed on the surface of the conduction rack 100, the calender roller 410 is attached to the surface of the transverse stretching assembly 300 under the driving of the driving rod 430, and the two ends of the damping rotating roller 130 are rotatably connected with the surface of the conduction rack 100 and are provided with a rotating damping.

[0028] The hot pressing assembly 200 comprises a guide seat 210, a guide roller 220 and a steam heating panel 230, the surface of the guide seat 210 is provided with a sliding groove hole 211, and the two ends of the guide roller 220 are movably sleeved in the sliding groove hole 211. The design ensures that the PET film can be smoothly conducted in the guide seat 210, avoids excessive heating of the film surface, and ensures uniform heating of the film material.

[0029] In a possible implementation, the transverse stretching assembly 300 is composed of the shaft 310 and the conical roller sleeve 320. The shaft 310 is fixedly installed in the conduction rack 100, and the conical roller sleeve 320 is in close contact with the surface of the PET film through the helical protrusions 321 on the surface thereof. The helical protrusions 321 play a guiding and expanding role in the transverse stretching of the PET film, so that the film material can be uniformly stretched in the transverse direction and achieve the ideal extension effect.

[0030] The calendering assembly 400 includes a calendering roller 410, a lever base 420, and a driving rod 430. The driving rod 430 drives the calendering roller 410 through the lever base 420 to be surface-adhered to the transverse stretching assembly 300, ensuring that the film surface is in close contact with the conical roller sleeve 320 during the transmission of the PET film. The calendering roller 410, driven by the driving rod 430, realizes the precise stretching of the film material by adjusting the pressure distribution.

[0031] The damping roller 130 is located in the transmission frame 100 and cooperates with the compression roller 120 and the output roller 140 to provide stable longitudinal stretching effect through its passive damping effect. During the stretching of the PET film, the damping roller 130 contacts the film surface through the friction generated by rotation, effectively controls the tension fluctuation in the stretching process, and ensures the ductility and uniformity of the film.

[0032] Specifically, the top surface of the transmission frame 100 is provided with a slope for guiding the compression roller 120, and the bottom end of the slope is opposite to the axis of the transverse stretching assembly 300, for guiding the compression roller 120 to slide downward and adhere to the surface of the transverse stretching assembly 300. The surface of the damping roller 130 is provided with an anti-skid sleeve for improving the surface friction with the PET film.

[0033] The driving rod 430 is used to drive the lever base 420 to perform lever deflection with the guide roller 110 as the fulcrum, so that the driving rod 430 is closely adhered to the surface of the transverse stretching assembly 300. The surface of the conical roller sleeve 320 is provided with two-section spiral convex rib structures, and the two-section spiral convex ribs are symmetrically arranged. The driving rod 430 is a conical roller and is adapted to the taper of the surface of the conical roller sleeve 320. The conical roller sleeve 320 and the ductility rib 321 are rubber material members. The shaft 310 is provided with an electric heating wire on the surface for temperature control of the conical roller sleeve 320. The surface curvature of the compression roller 120 is adapted to the surface curvature of the conical roller sleeve 320.

[0034] In a specific implementation, the steam heating panel 230 is internally provided with a heating module and a constant temperature control module, and the PET film is heated on both sides by high heat radiation. The heating module can uniformly heat in a short time, and the constant temperature control module can ensure the stability of the heating temperature, so as to realize the uniform heating and efficient stretching of the PET film.

[0035] In another embodiment, the number of guide seats 210 and guide rollers 220 is two groups, and they are arranged in point symmetry on the horizontal middle surface. This layout ensures that the PET film can maintain appropriate spacing between the film and the guide seat 210 during the transmission process, preventing excessive heating and thus ensuring the quality of the film material.

[0036] During the transverse stretching process, the matching of the conical roller 430 and the surface of the conical roller sleeve 320 enables the PET film to be uniformly stretched in the transverse direction. The close matching of the conical roller 430 and the surface of the conical roller sleeve 320 ensures that the film material is precisely controlled in pressure during the stretching process, avoiding deformation or rupture of the film during the transverse stretching process.

[0037] Through the above implementation, the utility model provides a kind of high efficiency, stable bidirectional stretching device, can ensure the uniform stretching of PET film in longitudinal and transverse direction, improve the ductility and stretching quality of film material, it is applicable to the high quality production process of PET film.The working principle and use flow of the utility model:

[0038] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A PET film biaxial stretching device, characterized in that, The application relates to a PET film production device, which comprises a conducting frame (100), a hot pressing assembly (200), a transverse stretching assembly (300), a calendering assembly (400), a damping rotating roller (130) and an output rotating roller (140) which are rotatably arranged in the inner side of the conducting frame (100), a pressure roller (120) which is arranged on the top surface of the conducting frame (100) and abuts against the surface of the transverse stretching assembly (300), a drive mechanism which is arranged on one side of the conducting frame (100) and is used for rotating a guide roller (110), the transverse stretching assembly (300) and the output rotating roller (140), the transverse stretching assembly (300) comprises a shaft (310) and a conical roller sleeve (320) which is fixedly sleeved on the surface of the shaft (310), the surface of the conical roller sleeve (320) is in the shape of a spindle, the surface of the conical roller sleeve (320) is provided with an extension edge (321), the calendering assembly (400) comprises a calendering roller (410), a rotating lever base (420) and a drive rod (430), the rotating lever base (420) is rotatably arranged on the surface of the guide roller (110) and is rotatably connected with the output end of the calendering roller (410) and the drive rod (430) at two ends respectively, the other end of the drive rod (430) is movably arranged on the surface of the conducting frame (100), the calendering roller (410) is in close contact with the surface of the transverse stretching assembly (300) under the drive of the drive rod (430), the two ends of the damping rotating roller (130) are rotatably connected with the surface of the conducting frame (100) and are provided with rotation damping, the hot pressing assembly (200) comprises a guide base (210), a guide roller (220) and a heating panel (230), the surface of the guide base (210) is provided with a sliding groove hole (211), and the two ends of the guide roller (220) are movably sleeved on the inner side of the sliding groove hole (211). The top surface of the conducting frame (100) is provided with an inclined surface which is used for guiding the pressure roller (120) and is opposite to the axis of the transverse stretching assembly (300) at the bottom end of the inclined surface, so as to guide the pressure roller (120) to slide downward and be in close contact with the surface of the transverse stretching assembly (300).

2. The PET film biaxial stretching device according to claim 1, wherein The surface of the damping rotating roller (130) is provided with an antiskid sleeve which is used for improving the surface friction with the PET film.

3. The PET film biaxial stretching apparatus according to claim 1, wherein The heating panel (230) is internally provided with a heating module and a constant temperature control module, and the PET film surface is heated on both sides through high heat radiation.

4. The PET film biaxial stretching apparatus according to claim 1, wherein The number of the guide roller (220) and the heating panel (230) is two groups and the two groups are arranged in point symmetry about the horizontal middle surface of the sliding groove hole (211).

5. The PET film biaxial stretching apparatus according to claim 1, wherein The drive rod (430) is used for driving the rotating lever base (420) to perform lever deflection with the guide roller (110) as a fulcrum, so that the drive rod (430) is closely attached to the surface of the transverse stretching assembly (300), the extension edge (321) on the surface of the conical roller sleeve (320) is a two-section spiral convex edge structure, and the two sections of the spiral convex edges are symmetrically arranged, and the drive rod (430) is in the shape of a conical roller and is matched with the taper of the surface of the conical roller sleeve (320).

6. The PET film biaxial stretching apparatus according to claim 1, wherein ​ 7. The PET film biaxial stretching apparatus according to claim 1, wherein The conical roller sleeve (320) and the extension edge (321) are rubber material members, the surface of the shaft (310) is provided with an electric heating wire for temperature control of the conical roller sleeve (320), and the surface curvature of the compression roller (120) is matched with the surface curvature of the conical roller sleeve (320).

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