Improved film winding device
By combining guide rollers and heating mechanisms, the TPEE film is uniformly heated using resistance heating tubes with staggered inverted conical heat dissipation grooves, which solves the problem of dimensional instability caused by internal stress after film forming, and achieves efficient production and product stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIAXING NANXIONG POLYMER
- Filing Date
- 2025-08-28
- Publication Date
- 2026-07-21
AI Technical Summary
Existing TPEE films suffer from dimensional instability due to internal stress after molding, resulting in curling, edge warping, and shrinkage, which affects downstream processing and product precision. Furthermore, existing processes require long curing chamber treatments, leading to low production efficiency and high costs.
By employing a combination of guide rollers and heating mechanisms, the film is uniformly heated by a heating mechanism located beneath it, releasing internal stress and stabilizing the crystal structure. The resistance heating tubes with staggered inverted conical heat dissipation grooves improve thermal efficiency and uniformity, preventing edge warping and curling.
This achieves dimensional stability of the film, avoids edge warping and curling, improves production efficiency, reduces energy and space costs, and increases product yield.
Smart Images
Figure CN224530230U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of thin film preparation technology, and in particular to an improved thin film winding device. Background Technology
[0002] Thermoplastic polyester elastomer (TPEE) is a type of linear block copolymer containing polyester hard segments and polyether or polyester soft segments. In industrial production, TPEE is favored for its excellent mechanical strength, creep resistance, fatigue resistance, chemical resistance, and wide operating temperature range (-40℃ to above 120℃), and is widely used in automotive parts (such as dust covers, pipes, and airbag covers), electronic and electrical appliances (such as wire and cable sheaths and connectors), industrial products (such as hoses and drive belts), and high-performance films.
[0003] Currently, the mainstream production processes for TPEE films mainly include casting and multilayer co-extrusion. Casting involves extruding the melt from a die and casting it onto cooling rollers for rapid cooling and shaping, producing films with smooth surfaces and good optical properties. Multilayer co-extrusion is used to produce high-performance films that require multiple functional layers.
[0004] However, existing technologies have the following problems in their preparation process: due to the inherent crystallization characteristics of TPEE material and the internal stress generated during processing, both cast films and co-extruded films face dimensional instability after molding.
[0005] 1. Curling and shrinkage: Uneven internal stress exists inside the formed film. During subsequent storage or use, the stress is gradually released, causing the film to curl, warp, or shrink unevenly, which seriously affects the dimensional accuracy of downstream processing (such as printing, lamination, and cutting) and the final product.
[0006] 2. To eliminate internal stress and stabilize dimensions, existing processes typically require the produced film rolls to be placed in a curing chamber and stored at specific temperatures for 48 to 72 hours. This process not only prolongs the production cycle and reduces production efficiency, but also occupies a large amount of space and energy, resulting in high raw material inventory costs and time costs.
[0007] 3. Internal stress issues also lead to unstable membrane bubbles and uneven winding of membrane rolls, resulting in severe edge curling, making it difficult to improve product yield.
[0008] In summary, there is an urgent need to solve the problem of film edge curling and film roll shrinkage caused by internal stress during the processing of TPEE and TPA films in the existing technology.
[0009] Currently, most TPEE or TPA films are produced using casting machines or multi-layer co-extrusion methods. After production, they need to be placed in a curing chamber and wait for 2-3 days until the raw material stress stabilizes, at which point there will be no curling or shrinkage issues. However, the time and raw material costs are relatively high. In the double-layer co-extrusion blow molding process, edge curling may also occur when the film is rolled up due to raw material stress. Utility Model Content
[0010] The purpose of this invention is to address the shortcomings of existing technologies by proposing an improved film winding device.
[0011] To achieve the above objectives, the present invention adopts the following technical solution:
[0012] An improved film winding device, comprising:
[0013] The guiding mechanism, consisting of several guide rollers, is used for film transport.
[0014] The heating mechanism is located below the guide mechanism.
[0015] The guiding mechanism includes guide roller 1, guide roller 2, guide roller 3, and guide roller 4. Guide roller 3 and guide roller 4 are arranged in parallel, and the film contacts the lower part of guide roller 3 and guide roller 4.
[0016] As a further improvement to this scheme, the heating mechanism is located below guide rollers three and four.
[0017] As a further improvement to this solution, the heating mechanism includes a frame and supporting legs. A resistance heating tube is installed inside the frame. The resistance heating tube includes a heat-conducting body and heat dissipation fins. The heat dissipation fins are distributed at equal intervals in a concentric ring pattern on the outer wall of the heat-conducting body.
[0018] As a further improvement to this solution, several inverted conical heat dissipation grooves are provided on the heat dissipation fins, which are evenly and staggered on the circumference of the heat dissipation fins.
[0019] As a further improvement to this scheme, the adjacent heat dissipation slots are heat dissipation slot one and heat dissipation slot two, with the cone apex of heat dissipation slot one and the cone apex of heat dissipation slot two facing opposite directions.
[0020] This utility model has the following beneficial effects:
[0021] 1) This utility model provides an improved film winding device. The winding device has a heating mechanism below the heating mechanism, which can heat the film in the transmission. The film after stress annealing is wound onto the winding mandrel to become a finished product with stable dimensions, which can effectively avoid edge curling or curling.
[0022] 2) The resistance heating tube with the heat dissipation groove structure of this utility model achieves the dual effects of "maximizing surface area" and "turbulent airflow", which ultimately enables the heating mechanism of the film winding device to have the advantages of rapid heating, high thermal efficiency, uniform temperature distribution and energy saving. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural diagram of an improved film winding device according to the present invention;
[0024] Figure 2 This is a three-dimensional structural diagram of an improved film winding device according to this utility model from another angle;
[0025] Figure 3 This is a three-dimensional structural diagram of the resistance heating tube of this utility model;
[0026] Figure 4 This is a front view of the resistance heating tube of this utility model;
[0027] Figure 5 This is a partial enlarged view of the inverted conical heat dissipation groove on the resistance heating tube of this utility model. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] Example 1
[0030] An improved film winding device, comprising:
[0031] The guiding mechanism 10 consists of several guide rollers and is used for film transport.
[0032] Heating mechanism 20 is located below guide mechanism 10.
[0033] The guiding mechanism 10 includes a first guide roller 11, a second guide roller 12, a third guide roller 13, and a fourth guide roller 14. The third guide roller 13 and the fourth guide roller 14 are arranged in parallel, and the film 30 contacts the lower part of the third guide roller 13 and the fourth guide roller 14.
[0034] The heating mechanism 20 is located below the guide rollers 3 13 and 4 14.
[0035] To address the following issues faced by existing technologies: Due to the inherent crystallization characteristics of TPEE material and the internal stress generated during processing, both cast films and co-extruded films face dimensional instability after molding: curling and shrinkage: Uneven internal stress exists inside the molded film. During subsequent storage or use, the stress is gradually released, causing the film to curl, warp, or shrink unevenly, which seriously affects downstream processing (such as printing, lamination, and cutting) and the dimensional accuracy of the final product.
[0036] In this embodiment, a guiding mechanism 10 and a heating mechanism 20 are included. Guide rollers are used to guide the film 30 smoothly from upstream (e.g., the extrusion or traction section) to the winding station. The guiding mechanism 10 specifically includes guide roller 11, guide roller 22, guide roller 33, and guide roller 44. Guide roller 33 and guide roller 44 are parallel to each other, forming a nearly horizontal film transport section. The film 30 wraps around the underside of guide roller 33 and guide roller 44 at a certain angle, fully exposing the lower surface of this section of film.
[0037] In this embodiment, the heating mechanism 20 is positioned directly below the horizontal film segment formed by guide roller 3 13 and guide roller 4 14. A gap (e.g., 75-85 mm) is maintained between the upper surface of the heating mechanism 20 and the lower surface of the film 30 to ensure efficient heat conduction while avoiding contact.
[0038] Working principle:
[0039] Before being wound up, film 30 first passes through a "heat treatment zone" consisting of guide rollers 313 and 414. In this zone, the lower surface of the film is uniformly heated by thermal radiation from the heating mechanism 20 below. The film is heated rapidly and uniformly.
[0040] In this embodiment, the heating mechanism 20 provides sufficient energy for the TPEE molecular chain segments to move, effectively releasing the internal stress accumulated during the previous extrusion and stretching processes. Simultaneously, this heat treatment process provides additional energy to the TPEE, promoting further refinement and stabilization of its crystal structure. After this online heat treatment, the stress distribution within the film becomes uniform, and the crystallinity increases, fundamentally suppressing subsequent curling and shrinkage tendencies. Finally, the stress-annealed film is wound onto a take-up mandrel, becoming a dimensionally stable finished product that effectively prevents edge warping or curling.
[0041] Example 2
[0042] An improved film winding device differs from that in Example 1 in that:
[0043] The heating mechanism 20 includes a frame 21 and a support leg 22. A resistance heating tube 23 is provided inside the frame 21. The resistance heating tube 23 includes a heat-conducting body 231 and heat dissipation fins 232. The heat dissipation fins 232 are distributed at equal intervals on the outer wall of the heat-conducting body 231 in the form of concentric rings.
[0044] The heat dissipation fins 232 are provided with a number of inverted conical heat dissipation grooves 233, which are evenly and staggeredly arranged on the circumference of the heat dissipation fins 232.
[0045] Furthermore, the adjacent heat dissipation slots 233 are heat dissipation slot one 2331 and heat dissipation slot two 2332, and the cone apex of heat dissipation slot one 2331 and the cone apex of heat dissipation slot two 2332 face opposite directions.
[0046] In practice:
[0047] An embodiment of an improved film winding apparatus
[0048] like Figures 3-4 As shown, the heating mechanism 20 of this improved film winding device is fixed to the equipment frame by a support leg 22. At least one resistance heating tube 23 is installed inside the cavity of the frame 21 to generate a uniform radiant heat field to heat the passing film.
[0049] The resistance heating tube 23 consists of an inner heat-conducting body 231 and an outer heat dissipation fin 232. The heat dissipation fins 232 are distributed at equal intervals along the axial direction of the heat-conducting body 231 in the form of concentric rings and are fixed to its outer wall.
[0050] The above-described structure greatly increases the heat dissipation surface area.
[0051] The core improvement in this embodiment lies in the optimization of the shape of the heat dissipation fins 232, as detailed below:
[0052] On each annular heat dissipation fin 232, several inverted conical heat dissipation slots 233 are evenly distributed circumferentially. The heat dissipation slots adopt an alternating symmetrical layout. More specifically, two adjacent heat dissipation slots are heat dissipation slot one 2331 and heat dissipation slot two 2332. When the cone apex of heat dissipation slot one 2331 faces to the left, the cone apex of the adjacent heat dissipation slot two 2332 faces to the right.
[0053] The working principle is as follows:
[0054] Significantly increased specific surface area: The inverted conical design itself provides a larger surface area than straight or square slots within a limited space. This alternating reverse layout pattern makes the distribution of heat sinks more dense and optimized, maximizing the heat exchange area in contact with the air without increasing the overall size of the fins.
[0055] Efficiently induces air turbulence: Traditional straight fins or unidirectional fins tend to allow air to flow along smooth surfaces, forming a stable laminar boundary layer, which is not conducive to heat dissipation.
[0056] Addressing the technical limitations of existing technologies and the heating requirements of thin films: Conical apexes with opposite directions act as a series of tiny vortex generators. When air flows through these alternating slots, its flow direction is continuously disturbed and altered, effectively disrupting the laminar boundary layer of the hot air and promoting turbulence. Turbulence can more efficiently remove heat from the fin surface, thus significantly enhancing convective heat transfer efficiency.
[0057] Ensuring uniform heating: This symmetrical and staggered layout ensures that the flow resistance and heat dissipation path are balanced in all directions when heat is radiated from the heat-conducting body 231 to the surrounding areas. This avoids local overheating or undercooling, allowing a highly uniform thermal field to be formed inside the frame 21. This is crucial for the winding process of high-quality films, effectively preventing material deformation or stress defects caused by uneven heating.
[0058] Example 3
[0059] The difference between Example 3 and Examples 1 and 2 is that:
[0060] A scalding grid 24 is provided above the heating mechanism 20. The design of the scalding grid can effectively prevent workers from being scalded during operation and increase safety.
[0061] The support structure at the bottom of the heating mechanism 20 can be optimized to be a lifting support assembly connected to the equipment frame.
[0062] The lifting support assembly can be any existing technology, including but not limited to a lead screw, rack and pinion mechanism or linear module, and can be configured with a handwheel, servo motor or hydraulic drive as a power source to precisely adjust the vertical position of the heating mechanism 20, thereby adapting to film winding conditions with different roll diameters or different tensions.
[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. An improved film winding device, characterized in that, The guiding mechanism (10) consists of several guide rollers and is used for the transport of the film (30); A heating mechanism (20) is provided below the guide mechanism (10); The guiding mechanism (10) includes a first guide roller (11), a second guide roller (12), a third guide roller (13), and a fourth guide roller (14). The third guide roller (13) and the fourth guide roller (14) are arranged in parallel, and the film (30) is in contact with the lower part of the third guide roller (13) and the fourth guide roller (14).
2. The improved film winding device according to claim 1, characterized in that, The heating mechanism (20) is located below the guide roller three (13) and the guide roller four (14).
3. The improved film winding device according to claim 1, characterized in that, The heating mechanism (20) includes a frame (21) and a support leg (22). A resistance heating tube (23) is provided inside the frame (21). The resistance heating tube (23) includes a heat-conducting body (231) and heat dissipation fins (232). The heat dissipation fins (232) are distributed at equal intervals on the outer wall of the heat-conducting body (231) in the form of concentric rings.
4. The improved film winding device according to claim 3, characterized in that, The heat dissipation fins (232) are provided with a plurality of inverted conical heat dissipation grooves (233), which are evenly and staggeredly arranged on the circumference of the heat dissipation fins (232).
5. The improved film winding device according to claim 4, characterized in that, An improved film winding device, wherein the adjacent heat dissipation grooves (233) are heat dissipation groove one (2331) and heat dissipation groove two (2332), and the cone apex of heat dissipation groove one (2331) and the cone apex of heat dissipation groove two (2332) face opposite directions.