Production device of heat conduction phase change material product

Abstract

The utility model provides a production device of a heat-conducting phase change material product. The production device comprises a hot calender and heating equipment connected with the hot calender, the hot calender is provided with a first feeding and grinding roller and a second feeding and grinding roller, a protective film interlayer conveyed by the first feeding and grinding roller and the second feeding and grinding roller is a feeding port, a baking table is arranged on the lower surface of the feeding port, two calendering rollers are further arranged between the first feeding and grinding roller and the second feeding and grinding roller, and a cavity with a preset gap is formed between the two calendering rollers. A cavity inlet of the calendering roller corresponds to the feeding port, and an air cooling device is arranged at a cavity outlet of the calendering roller. A thermoplastic deformation process is performed between the two layers of protective films, so that the phase change material has plasticity at a proper temperature; the pressure of a calendering roller acts on the material, so that a mold cavity is filled with the material in the rolling process, the expected thickness is achieved, the rolling speed is controlled, the product thickness is accurately controlled, and the uniformity of the product is guaranteed; and the formed product is rapidly cooled and shaped through the air cooling equipment, so that the shape and the performance are kept stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of production devices for phase change material products, in particular to a production device for heat-conducting phase change material products. BACKGROUND

[0002] With the continuous advancement of electronic devices towards miniaturization and high performance, heat rapidly accumulates during the operation of electronic components, and the demand for heat dissipation is increasingly urgent. Phase change materials (PCM) are of great concern in the field of electronic heat dissipation due to their strong heat throughput capacity during phase change.

[0003] Phase change materials refer to substances that change their state with temperature changes and can provide latent heat. Such materials can absorb or release a large amount of heat during phase change (such as solid-liquid phase change, solid-solid phase change, etc.). During the preparation of phase change materials, precise control of product thickness is crucial to ensure the thermal conductivity, stability and compatibility of the materials with electronic components.

[0004] However, the preparation of existing phase change materials cannot guarantee the uniformity of product thickness, limiting the further application of phase change materials in the field of electronic heat dissipation. CONTENT OF THE INVENTION

[0005] In view of the above problems, the present application is proposed to provide a production device for heat-conducting phase change material products, which overcomes the above problems or at least partially solves the above problems, comprising a hot calender and a heating device connected to the hot calender.

[0006] The hot calender is provided with a first feed roller and a second feed roller, the protective film interlayer conveyed by the first feed roller and the second feed roller is a feed inlet, an oven table is arranged on the lower surface of the feed inlet, and two calender rollers are further arranged between the first feed roller and the second feed roller, a cavity with a predetermined gap is formed between the two calender rollers, the cavity inlet of the calender roller corresponds to the feed inlet, and a air cooling device is arranged at the cavity outlet of the calender roller.

[0007] When the phase change material is placed in the feed inlet, the phase change material reaches a plastic state after passing through the oven table and reaches the desired thickness after passing through the cavity, and is shaped instantaneously by the air cooling device.

[0008] Preferably, the hot calender comprises an H-shaped calender table, the first feed roller is arranged at the front end face of the H-shaped calender table, the second feed roller is fixedly arranged on the upper end face of the H-shaped calender table close to one side of the first feed roller through a support frame, the oven table is arranged at the middle part of the H-shaped calender table close to one side of the first feed roller, the two calender rollers are symmetrically arranged with the oven table, and the air cooling device is arranged at the middle part of the H-shaped calender table away from the oven table.

[0009] Preferably, the two calender rollers have the same specifications.

[0010] Preferably, the support frame is provided with a first auxiliary roller, and the middle part of the H-shaped calender table is further provided with a second auxiliary roller, the first auxiliary roller is arranged below the second feed roller, and the second auxiliary roller is arranged above the calender roller.

[0011] Preferably, the rear end surface of the H-shaped calender table is provided with a winding roller.

[0012] Preferably, two traction rollers are further arranged between the air cooling device and the winding roller, the two traction rollers are symmetrically arranged with the extension surface of the cavity of the calender roller, and a cavity with a preset gap is formed between the two traction rollers.

[0013] Preferably, the size of the winding roller is greater than 6 inches.

[0014] Preferably, the air cooling device is provided with a wind shield and a plurality of equidistantly arranged fans arranged inside the wind shield.

[0015] Preferably, the baking table is provided with a temperature sensor and a heating wire connected with the heating device.

[0016] Preferably, the cutting device and the arrangement device are further included, the cutting device is arranged on one side of the winding roller, and the arrangement device is connected with the cutting device.

[0017] The application has the following advantages:

[0018] In the embodiment of the application, compared with the problem that it is difficult to ensure the uniformity of product thickness in the prior art, the application provides a solution for forming and thickness control of a phase change material product, specifically: a hot calender and a heating device connected with the hot calender; the hot calender is provided with a first feed roller and a second feed roller, the protective film interlayer conveyed by the first feed roller and the second feed roller is a feeding port, a baking table is arranged on the lower surface of the feeding port, two calender rollers are further arranged between the first feed roller and the second feed roller, a cavity with a preset gap is formed between the two calender rollers, the cavity inlet of the calender roller corresponds to the feeding port, and an air cooling device is arranged at the cavity outlet of the calender roller; when the phase change material is placed in the feeding port, the phase change material reaches a plastic state through the baking table and reaches an expected thickness through the cavity, and is shaped and fixed by the air cooling device at the moment of shaping. Through the hot plastic deformation process between the two protective films with a specific thickness, the appropriate temperature makes the phase change material have good plasticity; the pressure of the calender roller acts on the material to fill the mold cavity and reach the expected thickness during the roller pressing process, and the roller pressing speed is controlled to accurately control the product thickness and ensure its uniformity; the air cooling device rapidly cools and fixes the shaped product, and keeps the shape and performance stable. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present application, the drawings needed to be used in the description of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor based on the embodiments in the present application shall fall within the scope of protection of the present application.

[0020] Figure 1 is a front side structural schematic diagram of a production device of a heat-conducting phase change material product provided by an embodiment of the present application;

[0021] Figure 2 is a rear side structural schematic diagram of a production device of a heat-conducting phase change material product provided by an embodiment of the present application;

[0022] Figure 3 is a front side structural schematic diagram of a heat calender provided by an embodiment of the present application;

[0023] Figure 4 is a rear side structural schematic diagram of a heat calender provided by an embodiment of the present application;

[0024] Figure 5 is a structural schematic diagram of an air cooling device provided by an embodiment of the present application;

[0025] Figure 6 is a structural schematic diagram of a calender roll provided by an embodiment of the present application;

[0026] Figure 7 is a process flow schematic diagram of a production device of a heat-conducting phase change material product provided by an embodiment of the present application.

[0027] The reference signs in the drawings of the specification are as follows:

[0028] 100, heat calender; 101, first feed roll; 102, second feed roll; 103, baking table; 104, calender roll; 105, air cooling device; 106, first auxiliary roll; 107, second auxiliary roll; 108, winding roll; 109, traction roll; 200, heating device; 300, cutting device; 400, finishing device. DETAILED DESCRIPTION

[0029] In order to make the purposes, features and advantages of the present application more obvious and easy to understand, the present application will be further described in detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0030] The inventor found that the existing heat-conducting phase change material product preparation device has significant shortcomings in the accurate control of product thickness and the optimization of processing flow. The lack of product thickness uniformity leads to uneven heat conduction and increased risk of local overheating. The complex and lengthy processing technology, high equipment investment and operation cost, and low production efficiency greatly hinder the development of phase change materials in the field of electronic heat dissipation, and process innovation is imminent.

[0031] The inventor designs a heat calender to shape and control the thickness of the phase change material product, which can effectively control the product thickness, optimize the processing technology, and ensure the performance and appearance yield of the heat-conducting phase change material.

[0032] Referring to Figure 1 and Figure 2 , a production device for a heat-conducting phase change material product is shown, which includes a heat calender 100 and a heating device 200 connected to the heat calender 100.

[0033] The heat calender 100 is provided with a first feed roller 101 and a second feed roller 102. The protective film sandwich conveyed by the first feed roller 101 and the second feed roller 102 is the feed inlet. The lower surface of the feed inlet is provided with a baking table 103. Two calender rollers 104 are further provided between the first feed roller 101 and the second feed roller 102. The two calender rollers 104 form a cavity with a preset gap therebetween. The cavity inlet of the calender roller 104 corresponds to the feed inlet. The cavity outlet of the calender roller 104 is provided with an air cooling device 105.

[0034] When the phase change material is placed in the feed inlet, the phase change material reaches a plastic state after passing through the baking table 103 and reaches the desired thickness after passing through the cavity. The product is shaped and fixed by the air cooling device 105 at the moment of shaping.

[0035] In the embodiments of the present application, in order to solve the problem of difficulty in ensuring the uniformity of product thickness in the prior art, the present application provides a solution for forming and thickness control of phase change material products, specifically: comprising a hot calender 100 and a heating device 200 connected with the hot calender 100; the hot calender 100 is provided with a first feed mill roller 101 and a second feed mill roller 102, the protective film interlayer conveyed by the first feed mill roller 101 and the second feed mill roller 102 is a feed inlet, an oven table 103 is arranged on the lower surface of the feed inlet, two calender rollers 104 are further arranged between the first feed mill roller 101 and the second feed mill roller 102, a cavity with a preset gap is formed between the two calender rollers 104, the cavity inlet of the calender roller 104 corresponds to the feed inlet, and the cavity outlet of the calender roller 104 is provided with an air cooling device 105; when the phase change material is placed in the feed inlet, the phase change material reaches a plastic state after passing through the oven table 103 and reaches the desired thickness after passing through the cavity, and is shaped by the air cooling device 105 at the moment of shaping. By undergoing a thermoplastic deformation process between two layers of protective film with a specific thickness, the appropriate temperature makes the phase change material have good plasticity; the pressure of the calender roller 104 acts on the material to make it fill the mold cavity during roller pressing and reach the desired thickness, and the roller pressing speed is controlled to accurately control the product thickness and ensure its uniformity; the air cooling device 105 rapidly cools and shapes the formed product to keep the shape and performance stable.

[0036] In the following, a production device for a heat-conducting phase change material product in one of the exemplary embodiments of the present application will be further described.

[0037] With reference to Figure 3 , Figure 4 and Figure 7 , in an embodiment of the present application, the hot calender 100 comprises an H-shaped calender table, the first feed mill roller 101 is arranged on the front end surface of the H-shaped calender table, the second feed mill roller 102 is fixedly arranged on the upper end surface of the H-shaped calender table close to one side of the first feed mill roller 101 through a support frame, the oven table 103 is arranged on the middle part of the H-shaped calender table close to one side of the first feed mill roller 101, the two calender rollers 104 are symmetrically arranged with the oven table 103, and the air cooling device 105 is arranged on the middle part of the H-shaped calender table away from the oven table 103.

[0038] It should be noted that the first grinding roller 101 and the second grinding roller 102 are respectively used for conveying the protective film, and the dispersed material is placed between the two layers of protective films of the first grinding roller 101 and the second grinding roller 102. Considering the demolding force problem, the first grinding roller and the second grinding roller adopt the same specification of protective film, and the same specification of the upper and lower parts ensures the symmetrical stress. The protective film has a significant effect in multiple dimensions in the forming: as a physical barrier to avoid material sticking to the roller, contamination of the equipment, and ensure the surface quality; heat transfer regulation to assist in heat distribution, stabilize the forming temperature field, and help control the thickness uniformity; demolding to assist in reducing the demolding force, ensure the complete demolding of the product, maintain the edge and overall thickness precision, prolong the service life of the mold, reduce the cost, improve the production efficiency, and protect the film and the hot calendering parameters to adapt to each other, which guarantees the product forming quality.

[0039] As an example, the specification of the protective film can be selected as 50 microns or 75 microns. The protective film clamps the product and then enters the hot calendering machine together for forming.

[0040] In a specific implementation, to overcome the separation problem of the product and the film, the inventor has selected the same specification of silicon release film through repeated tests and screening optimization. The silicon release film has consistent demolding force characteristics from top to bottom, effectively resists the separation of the film and the product when the super-long product is bent, greatly improves the appearance integrity and quality stability of the product, and ensures the smooth production process. The mechanism is that the same specification ensures the uniform and symmetrical distribution of the demolding force. When the product is bent, the two sides of the demolding force cooperatively maintain the film and product adhesion state, avoid local stress concentration causing separation, significantly reduce the waste rate caused by film separation, and improve production efficiency and product quality.

[0041] In a specific implementation, the first grinding roller and the second grinding roller are both provided with a motor, the two grinding rollers are driven by the motor to convey the film, and the material is placed between the two layers of protective films as the feeding port. The baking table 103 is arranged on the lower surface of the feeding port to provide a suitable heat environment for the material plasticization, so that the material is uniformly heated and plasticized. The two calendering rollers 104 are used to apply pressure to the material to ensure uniform filling of the mold cavity to the expected thickness, and the roller pressure speed ensures that the material is uniformly stressed and smoothly travels. The material enters the air cooling program immediately after being formed by the calendering rollers 104, and the air cooling equipment 105 is arranged in parallel with the extension surface of the mold cavity of the calendering roller 104 to efficiently and uniformly cool and shape the product at a certain air cooling speed. After the product is air cooled to the discharge port, the thickness reflects the changes in flow and speed, and the dynamic streamline of the roller shaft presents the stress deformation and flow state of the material, which helps to analyze the forming mechanical properties.

[0042] Referring to Figure 6 In an embodiment of the present application, the two calendering rollers 104 have the same specification. The two calendering rollers 104 are symmetrically arranged above and below, and the same specification of the upper and lower parts ensures the symmetrical stress, which ensures that the overall stress of the product is uniform and stable.

[0043] In an embodiment of the present application, the support frame is provided with a first auxiliary roller 106, and the middle part of the H-shaped calender table is further provided with a second auxiliary roller 107. The first auxiliary roller 106 is arranged below the second feeding roller 102, and the second auxiliary roller 107 is arranged above the calender roller 104.

[0044] It should be noted that the first auxiliary roller 106 and the second auxiliary roller 107 are used to assist in film feeding. The protective film of the second feeding roller passes through the first auxiliary roller 106 and the second auxiliary roller 107 in turn, and finally passes through the calender roller 104 above to pass through the cavity between the two calender rollers 104.

[0045] In an embodiment of the present application, the rear end face of the H-shaped calender table 100 is provided with a winding roller 108.

[0046] It should be noted that the winding speed parameter can be accurately determined according to the product thickness, length and material characteristics. At the moment of winding start, the speed of the winding roller 108 is accurately set to be slightly faster than the calendering speed, so as to smoothly pull the product into the winding with moderate tension, preventing the film and product from separating due to insufficient or fluctuating tension. After the winding roller 108 contacts the product, the winding speed is adjusted in real time by a high-precision sensor and an intelligent control system, and quickly and accurately synchronized to the calendering speed, so as to ensure that the overall stress of the product is uniform and stable, and the film and product are closely adhered. Especially for ultra-thin products, the winding process strictly avoids empty load, sudden stop or sudden change of speed, and uses tension closed-loop control technology to ensure constant tension before and after, and comprehensively protects the appearance of the product, smooth and smooth texture, and the close adhesion of the film, so as to improve the overall quality stability and production process reliability of the product, and lay a process foundation for large-scale commercial production of the product.

[0047] In an embodiment of the present application, two traction rollers 109 are further arranged between the air cooling device 105 and the winding roller 108. The two traction rollers 109 are symmetrically arranged with the extension of the cavity of the calender roller 104, and a cavity with a predetermined gap is formed between the two traction rollers 109. It should be noted that the traction roller 109 is used to assist in pulling the product to the winding roller 108.

[0048] In an embodiment of the present application, the size of the winding roller 108 is greater than 6 inches.

[0049] It should be noted that a large-size (such as a size of 6 inches or more) winding roller 108 is preferably selected, which reduces the bending degree of the product during winding by virtue of its large radius of curvature, disperses the bending stress distribution, and effectively prevents the film and product from separating.

[0050] Referring to Figure 5 In an embodiment of the present application, the air cooling device 105 is provided with a fan cover and a plurality of equidistantly arranged fans arranged inside the fan cover.

[0051] It should be noted that the air cooling link is a key stabilizing process after molding. The molded product carries a large amount of heat, and the pre-set air cooling air quickly removes heat according to the heat exchange principle, so that the product is quickly cooled and shaped. This process solidifies the microstructure of the product, locks the molecular arrangement and phase distribution, stabilizes the macro size precision and performance parameters, enhances the environmental adaptability and long-term reliability of the product, prevents damage due to thermal stress deformation in use, ensures smooth transition from thermoplastic state to steady state, and stabilizes the performance of the product in heat dissipation applications. Because the product thickness is thin, air cooling can meet the cooling requirements, and can be integrated with the heat calender 100 to achieve integration, which not only improves the process complexity of the traditional heat conduction pad calendering process using circulating water cooling, but also saves equipment space.

[0052] The fan matrix of the air cooling equipment 105 is optimized according to the principle of aerodynamics, and the specially designed air cover quickly dissipates heat, quickly removes heat by forced convection heat exchange mechanism, stabilizes the microstructure and macro performance of the product, ensures constant and stable size accuracy, greatly shortens the production cycle, improves production efficiency, and strengthens the closed loop of product quality control.

[0053] In an embodiment of the present application, the baking table 103 is provided with a temperature sensor and a heating wire, and the heating wire is connected with the heating device 200.

[0054] It should be noted that in order to overcome the problem of pinholes after product thinning, the temperature of the heat calender 100 and the temperature of the baking table 103 are precisely adjusted, the temperature difference is strictly controlled in a very small range, the temperature of the material contact interface is kept constant and uniform, and the pinholes caused by temperature gradient are prevented. At the same time, according to the precise regulation of the temperature influence on the material flowability, a multi-parameter coupling model of material flowability, temperature, pressure and roller speed is constructed to ensure uniform and continuous calendering of the material, to inhibit the generation of pinholes, film wrinkles and pressure marks from the source, and to improve the consistency of product appearance flatness and heat dissipation performance.

[0055] In a specific implementation, the heat calender 100 is also provided with a temperature control module, a pressure control module and a roller speed adjustment module. The temperature control module cooperates with the heating wire and the sensor to precisely maintain the preset temperature, and provides a suitable heat environment for material plasticization. The pressure control module applies pressure at a preset pressure according to the material characteristics to ensure uniform filling. The roller speed adjustment module controls the speed of the calendering roller 104 to ensure uniform material speed.

[0056] Referring to Figure 7 In an embodiment of the present application, it also includes a cutting device 300 and a finishing device 400, the cutting device 300 is arranged on one side of the winding roller 108, and the finishing device 400 is connected with the cutting device 300.

[0057] As an example, when the product batch is small, a cutting machine is used for cutting or an engraving machine is used for engraving to obtain the required size and shape. The cutting accuracy of the cutting machine can reach ±0.1mm, and the engraving machine can realize the processing of complex shapes with a processing accuracy of ±0.05mm.

[0058] As another example, when the product batch is large, a cutting die stamping method is used. The manufacturing accuracy of the stamping die is ±0.03mm, which can efficiently stamp out products of a specific shape and ensure the consistency and stability of the product size.

[0059] It should be noted that the arrangement device 400 is used to stack the finished products neatly. The devices of the device work cooperatively to realize efficient and accurate preparation of the thermally conductive phase change material. Through automation of the devices, several processes are unified into one process to reduce labor and improve production efficiency.

[0060] The heat calender 100 of the utility model precisely controls temperature, pressure and rolling speed, so that the mixture experiences a thermoplastic deformation process between two layers of protective film with specific thickness. Appropriate temperature makes the material have good plasticity, so that the material reaches ideal plastic state, the balance between molecular chain flexibility and rigidity, and the material is filled in the mold and reaches the expected thickness. Compacting the material enhances the stability of the internal structure, and the rolling speed affects the residence time and stress uniformity of the material in the heat calender 100. By controlling these parameters and the thickness of the protective film, the product thickness can be precisely controlled and its uniformity can be ensured. The air cooling process uses the rapid flow of air to take away heat, so that the formed product is rapidly cooled and shaped, and the shape and performance are stable.

[0061] Although the preferred embodiments of the application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the embodiments of the application.

[0062] Finally, it is to be understood that the phraseology or terminology such as "first" and "second" etc. used herein is merely intended to differentiate one entity or operation from another entity or operation, without necessarily requiring or implying any actual such relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0063] The above has carried on the detailed introduction to the production device of the heat-conducting phase change material product provided by the application, the principle and implementation mode of the application are described by applying specific examples in the present article, the above example explanation is only for helping to understand the method and core idea of the application; meanwhile, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have the change, according to the above, the content of the specification should not be understood as the limitation of the application.

Claims

1. A production apparatus for thermally conductive phase change material products, characterized in that, The hot calender machine and a heating device connected with the hot calender machine are included. The hot calender machine is provided with a first feed roller and a second feed roller, the protective film interlayer conveyed by the first feed roller and the second feed roller is a feeding port, an oven table is arranged on the lower surface of the feeding port, two calender rollers are further arranged between the first feed roller and the second feed roller, a cavity with a preset gap is formed between the two calender rollers, the cavity inlet of the calender roller corresponds to the feeding port, and the cavity outlet of the calender roller is provided with air cooling equipment. When the phase change material is placed in the feeding port, the phase change material reaches a plastic state through the oven table and reaches an expected thickness through the cavity, and is shaped and fixed through the air cooling equipment at the moment of shaping.

2. The apparatus for producing a thermally conductive phase change material product according to claim 1, wherein The hot calender machine includes an H-shaped calender table, the first feed roller is arranged on the front end surface of the H-shaped calender table, the second feed roller is fixedly arranged on the upper end surface of the H-shaped calender table close to one side of the first feed roller through a support frame, the oven table is arranged on the middle part of the H-shaped calender table close to one side of the first feed roller, the two calender rollers are symmetrically arranged with the oven table, and the air cooling equipment is arranged on the middle part of the H-shaped calender table away from one side of the oven table.

3. The apparatus for producing a thermally conductive phase change material product according to claim 2, wherein The two calender rollers have the same specifications.

4. The apparatus for producing a thermally conductive phase change material product according to claim 2, wherein The support frame is provided with a first auxiliary roller, the middle part of the H-shaped calender table is further provided with a second auxiliary roller, the first auxiliary roller is arranged below the second feed roller, and the second auxiliary roller is arranged above the calender roller.

5. The apparatus for producing a thermally conductive phase change material product according to claim 2 or 4, wherein The rear end surface of the H-shaped calender table is provided with a winding roller.

6. The apparatus for producing a thermally conductive phase change material product according to claim 5, wherein Two traction rollers are further arranged between the air cooling equipment and the winding roller, the two traction rollers are symmetrically arranged with the extension surface of the cavity of the calender roller, and a cavity with a preset gap is formed between the two traction rollers.

7. The apparatus for producing a thermally conductive phase change material product according to claim 5, wherein The size of the winding roller is greater than 6 inches.

8. The apparatus for producing a thermally conductive phase change material product according to claim 2, wherein The air cooling equipment is provided with a fan cover and a plurality of equidistantly arranged fans arranged in the fan cover.

9. The apparatus for producing a thermally conductive phase change material product according to claim 2, wherein The oven table is provided with a temperature sensor and a heating wire, and the heating wire is connected with the heating device.

10. The apparatus for producing a thermally conductive phase change material product according to claim 5, wherein The cutting equipment is arranged on one side of the winding roller, and the arrangement equipment is connected with the cutting equipment.

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