PET (Polyethylene Terephthalate) thermal shrinkage film forming equipment

Abstract

The utility model relates to the technical field of PET thermal shrinkage film production equipment, in particular to PET thermal shrinkage film forming equipment. In the production process of the thermal shrinkage film, the molten PET material is extruded from the mold to form the thermal shrinkage film. After the thermal shrinkage film is discharged from the material in the mold, the heat of the thermal shrinkage film is taken away by the first cooling device through airflow, so that the thermal shrinkage film is preliminarily shaped, and the thermal shrinkage film has certain structural strength. The thermal shrinkage film is cooled by the first cooling device and then cooled by the second cooling device through the cooling liquid, so that the cooling efficiency of the thermal shrinkage film is improved. Due to the fact that the thermal shrinkage film has certain structural strength after being cooled by the first cooling device, flow marks cannot be left even if the second cooling device makes contact with cooling liquid, and the product quality of the thermal shrinkage film is guaranteed. In this way, the quality of the thermal shrinkage film is guaranteed in the thermal shrinkage film forming process.

Description

Technical Field

[0001] The present application relates to the technical field of PET heat shrink film production equipment, and in particular to a PET heat shrink film molding equipment. Background Art

[0002] PET (polyethylene terephthalate) heat shrinkable film is a new type of heat shrinkable packaging material. It is increasingly used as a packaging material due to its characteristics of easy recycling, non-toxicity, odorlessness, good mechanical properties, and especially compliance with environmental protection.

[0003] In the production process of PET heat shrink film, PET particles are usually melted and then formed into a heat shrink film structure with a specific shape through a mold. In the process of the heat shrink film changing from a molten state to a solid state, the heat shrink film needs to be cooled and condensed. At present, the heat shrink film is usually cooled by directly spraying water on the formed heat shrink film to condense and form the heat shrink film.

[0004] However, when water is sprayed onto the heat shrink film that has not yet been formed, the water will impact the heat shrink film, causing water marks on the heat shrink film after it is formed, reducing the quality of the heat shrink film. In addition, the uneven distribution of water on the heat shrink film will cause the unformed heat shrink film to be subjected to uneven stress and temperature drop, further aggravating the imprint of the water marks, resulting in reduced quality of the heat shrink film or even scrapping it.

[0005] It can be seen that how to ensure the quality of heat shrinkable film during the process of heat shrinkable film forming is a technical problem that needs to be solved urgently. Summary of the invention

[0006] The present application provides a PET heat shrink film forming device, which aims to solve the technical problem of how to ensure the quality of the heat shrink film during the heat shrink film forming process in the prior art.

[0007] The present application provides a PET heat shrink film forming device, comprising:

[0008] a first cooling device, wherein the first cooling device cools the heat shrinkable film by airflow;

[0009] a second cooling device, wherein the second cooling device cools the heat shrinkable film by means of a liquid;

[0010] Wherein, in the process of cooling the heat shrinkable film, the film is first cooled by the first cooling device and then cooled by the second cooling device.

[0011] Optionally, the first cooling device includes an air guide component, and the air guide component is used to make the airflow for cooling the heat shrinkable film flow around the heat shrinkable film in a ring shape.

[0012] Optionally, the air guide component is provided with:

[0013] An air flow channel for air flow to flow through;

[0014] An air inlet, which is pneumatically connected to the air flow channel and is used to allow external air flow to enter the air flow channel;

[0015] An air outlet, which is annular and is pneumatically connected to the air flow channel;

[0016] Wherein, during the process of heat shrink film forming, the heat shrink film passes through the annular range of the air outlet.

[0017] Optionally, the air outlet is provided with a flow guiding part for changing the angle between the air flow direction and the heat shrink film conveying direction.

[0018] Optionally, the flow guiding part is annularly distributed, and the distribution center of the flow guiding part coincides with the annular center of the air outlet.

[0019] Optionally, the flow guiding part is provided with air leakage grooves, which are annularly distributed, and the distribution center of the air leakage grooves coincides with the annular center of the air outlet.

[0020] Optionally, the size of the air leakage grooves gradually increases along the conveying direction of the heat shrink film.

[0021] Optionally, the air flow channel is annular, and the annular center of the air flow channel coincides with the annular center of the air outlet.

[0022] Optionally, the number of the air inlets is at least three, the air inlets are annularly distributed, and the distribution center of the air inlets coincides with the annular center of the air outlet.

[0023] Optionally, the second cooling device includes:

[0024] A liquid supply component for supplying coolant to the heat shrink film;

[0025] A liquid absorption component for surrounding and contacting the heat shrink film, and the liquid absorption component can absorb the coolant;

[0026] Wherein, during the operation of the second cooling device, the liquid supply component makes the coolant reach the liquid absorption component, and after the liquid absorption component absorbs the coolant, the coolant contacts the heat shrink film annularly.

[0027] The beneficial effects achieved by this application are as follows: During the production process of the heat-shrinkable film, the molten PET material is extruded from the mold to form the heat-shrinkable film. After the heat-shrinkable film comes out of the mold material, it first passes through the first cooling device, and the heat of the heat-shrinkable film is carried away by the air flow, thereby initially shaping the heat-shrinkable film and endowing it with a certain structural strength. After the heat-shrinkable film is cooled by the first cooling device, it is then cooled by the second cooling device through the coolant, thereby improving the cooling efficiency of the heat-shrinkable film. Since the heat-shrinkable film has a certain structural strength after being cooled by the first cooling device, even if it comes into contact with the coolant at the second cooling device, no flow marks will be left, thereby ensuring the product quality of the heat-shrinkable film. In this way, the quality of the heat-shrinkable film is ensured during the forming process of the heat-shrinkable film. Brief Description of the Drawings

[0028] Figure 1 is a schematic diagram of the principle structure of the PET heat-shrinkable film forming device in an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the principle structure of the first cooling device in an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the internal structure of the first cooling device in an embodiment of the present invention.

[0031] Main Unit Symbol Explanation:

[0032] 10. PET heat-shrinkable film forming device; 20. First cooling device; 21. Air guiding component; 22. Air flow channel; 23. Air inlet; 24. Air outlet; 25. Flow guiding part; 26. Air leakage groove; 30. Second cooling device; 31. Liquid supply component; 32. Liquid storage tank; 33. Liquid outlet; 34. Liquid collection tank; 35. Liquid absorption component; 36. Ring bracket; 40. Heat-shrinkable film. Detailed Embodiment

[0033] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar units or units with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "left", "right", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "a plurality of" means two or more unless otherwise specifically defined.

[0036] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection that can communicate with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two units or the interaction relationship between two units. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0039] Please refer to Figure 1 , in some embodiments of the present application, the present application provides a PET heat-shrinkable film forming device 10, including: a first cooling device 20 and a second cooling device 30. The first cooling device 20 cools the heat-shrinkable film 40 through air flow. The second cooling device 30 cools the heat-shrinkable film 40 through liquid. Wherein, during the process of cooling the heat-shrinkable film 40, it is first cooled by the first cooling device 20 and then cooled by the second cooling device 30.

[0040] During the production process of the heat-shrinkable film 40, after the molten PET material is extruded from the mold, the heat-shrinkable film 40 is formed. After the heat-shrinkable film 40 comes out of the mold material, the first cooling device 20 first takes away the heat of the heat-shrinkable film 40 through air flow, thereby preliminarily shaping the heat-shrinkable film 40 and making the heat-shrinkable film 40 have a certain structural strength. After the heat-shrinkable film 40 is cooled by the first cooling device 20, it is then cooled by the second cooling device 30 through the coolant, thereby improving the cooling efficiency of the heat-shrinkable film 40. Since the heat-shrinkable film 40 has a certain structural strength after being cooled by the first cooling device 20, even if it comes into contact with the coolant at the second cooling device 30, no flow marks will be left, thereby ensuring the product quality of the heat-shrinkable film 40. Thus, the quality of the heat-shrinkable film 40 is ensured during the forming process of the heat-shrinkable film 40.

[0041] In some embodiments of the present application, air flow can be provided to the first cooling device 20 through a blower.

[0042] In some embodiments of the present application, the cooling liquid of the second cooling device 30 includes water.

[0043] Please refer to Figure 2 , in some embodiments of the present application, the first cooling device 20 includes a wind guiding component 21, and the wind guiding component 21 is used to make the air flow for cooling the heat-shrinkable film 40 flow around the heat-shrinkable film 40 in a circular shape.

[0044] The air flow used for cooling flows in a circular shape around the heat shrink film 40 through the air guiding assembly 21, so that the air flow contacts the heat shrink film 40 evenly, preventing the heat shrink film 40 from deforming due to uneven force of the air flow, and thus ensuring the product quality of the heat shrink film 40.

[0045] In some embodiments of the present application, the air guiding assembly 21 is provided with: an air flow channel 22, an air inlet 23, and an air outlet 24. The air flow channel 22 allows the air flow to flow. The air inlet 23 is connected to the air flow channel 22 in an air path, and the air inlet 23 is used to allow the external air flow to enter the air flow channel 22. The air outlet 24 is in a circular shape, and the air outlet 24 is connected to the air flow channel 22 in an air path. Among them, during the forming process of the heat shrink film 40, the heat shrink film 40 passes through the circular range of the air outlet 24.

[0046] After the air flow enters the air flow channel 22 from the air inlet 23, a part of the kinetic energy is consumed in the air flow channel 22, making the air flow smoother. After passing through the air flow channel 22, the air flow then flows out from the circular air outlet 24, so that the air flow flows around the heat shrink film 40 in a circular shape, and thus the air flow contacts the heat shrink film 40 evenly, preventing the heat shrink film 40 from deforming due to uneven force of the air flow, and thus ensuring the product quality of the heat shrink film 40.

[0047] Please refer to Figures 2 to 3 , in some embodiments of the present application, the air outlet 24 is provided with a flow guiding portion 25, and the flow guiding portion 25 is used to change the included angle between the air flow direction and the conveying direction of the heat shrink film 40.

[0048] By changing the air flow direction through the flow guiding portion 25, the flowing direction of the air flow forms a certain included angle with the conveying direction of the heat shrink film 40, thus avoiding the air flow directly impacting the heat shrink film 40, and thus avoiding the heat shrink film 40 from deforming due to the impact force of the air flow, and thus ensuring the product quality of the heat shrink film 40.

[0049] In some embodiments of the present application, the included angle between the air flow direction and the conveying direction of the heat shrink film 40 can be greater than 90°, and the air flow direction faces the outlet direction away from the heat shrink film 40 mold.

[0050] By making the angle between the airflow direction and the conveying direction of the heat shrinkable film 40 greater than 90°, the airflow can flow a longer distance along the heat shrinkable film 40 toward the conveying direction of the heat shrinkable film 40, thereby increasing the contact range between the airflow and the heat shrinkable film 40, and thereby making the airflow per unit volume take away more heat, thereby improving the cooling efficiency of the airflow, improving the cooling effect of the airflow on the heat shrinkable film 40, and improving the product quality of the heat shrinkable film 40. By making the airflow direction facing away from the outlet direction of the heat shrinkable film 40 mold, the airflow is prevented from blowing toward the heat shrinkable film 40 mold, preventing the airflow from causing heat loss to the mold, ensuring the molding effect of the mold on the heat shrinkable film 40, and preventing the heat shrinkable film 40 from condensing at the mold outlet, thereby making the heat shrinkable film 40 more smoothly extruded from the mold. By preventing the heat shrinkable film 40 from condensing at the mold outlet, the mold outlet can also be prevented from being blocked, thereby ensuring the reliability of the heat shrinkable film 40 production process.

[0051] In some embodiments of the present application, the guide portions 25 are distributed in an annular shape, and the distribution center of the guide portions 25 coincides with the annular center of the air outlet 24 .

[0052] By making the guide part 25 distributed in a ring shape, the airflow changes its flow direction through the guide part 25 and still surrounds the heat shrink film 40 in a ring shape evenly, so that the heat shrink film 40 is evenly stressed and the airflow evenly absorbs the heat of the heat shrink film 40, thereby preventing uneven heat dissipation of the heat shrink film 40 and reducing the product quality of the heat shrink film 40, thereby ensuring the product quality of the heat shrink film 40.

[0053] In some embodiments of the present application, the air guide portion 25 is provided with air leakage grooves 26 . The air leakage grooves 26 are distributed in an annular shape, and the distribution center of the air leakage grooves 26 coincides with the annular center of the air outlet 24 .

[0054] After the airflow flows out from the air outlet 24, it flows along the guide part 25, and then changes the flow direction of the airflow through the guide part 25. In the process of the airflow flowing along the guide part 25, when the airflow passes through the air leakage groove 26, part of the airflow leaks out from the air leakage groove 26 and then reaches the heat shrink film 40 in advance to cool the heat shrink film 40. After all the airflows pass through the guide part 25, all the airflows reach the heat shrink film 40, and then the heat shrink film 40 is cooled by a larger amount of airflow. By having part of the airflow pass through the air leakage groove 26 and reach the heat shrink film 40 first, the airflow reaches the heat shrink film 40 more slowly, further reducing the impact of the airflow on the heat shrink film 40, and then preventing the heat shrink film 40 from being deformed by the impact of the airflow, thereby ensuring the product quality of the heat shrink film 40. Part of the air flows through the air leakage groove 26 to reach the heat shrinkable film 40 first, thereby preliminarily cooling the heat shrinkable film 40. Before the heat shrinkable film 40 contacts a large amount of airflow, it is preliminarily condensed, so that the structural strength of the heat shrinkable film 40 is preliminarily increased, and the heat shrinkable film 40 can withstand the impact of a larger airflow, thereby ensuring the cooling effect of the airflow on the heat shrinkable film 40 and ensuring the product quality of the heat shrinkable film 40.

[0055] In some embodiments of the present application, the size of the air leakage groove 26 gradually increases along the conveying direction of the heat shrinkable film 40.

[0056] By making the size of the air leakage groove 26 gradually increase along the conveying direction of the heat shrinkable film 40, the air leakage amount of the air leakage groove 26 gradually increases along the conveying direction of the heat shrinkable film 40, so that the contact process between the air flow and the heat shrinkable film 40 is smoother and more uniform, thereby ensuring the cooling effect of the air flow on the heat shrinkable film 40 and remarking the product quality of the heat shrinkable film 40.

[0057] In some embodiments of the present application, the air flow channel 22 is annular, and the annular center of the air flow channel 22 coincides with the annular center of the air outlet 24.

[0058] By designing the air flow channel 22 to be annular, the air flow flows in an annular shape before flowing out of the air outlet 24, so as to ensure the uniformity of the air flow flowing out of the air outlet 24, make the force on the heat shrinkable film 40 more uniform, and further improve the product quality of the heat shrinkable film 40.

[0059] In some embodiments of the present application, the number of the air inlets 23 is at least three, the air inlets 23 are annularly distributed, and the distribution center of the air inlets 23 coincides with the annular center of the air outlet 24.

[0060] By supplying air to the air flow channel 22 through multiple air inlets 23, the flow of the air flow in the air flow channel 22 becomes more uniform, further improving the uniformity of the air flow flowing out of the air outlet 24, making the force on the heat shrinkable film 40 more uniform, and further improving the product quality of the heat shrinkable film 40.

[0061] Please refer to Figure 1 , in some embodiments of the present application, the second cooling device 30 includes: a liquid supply component 31 and a liquid absorption component 35. The liquid supply component 31 is used to supply a coolant to the heat shrinkable film 40. The liquid absorption component 35 is used to surround and contact the heat shrinkable film 40, and the liquid absorption component 35 can absorb the coolant. Among them, during the operation of the second cooling device 30, the liquid supply component 31 makes the coolant reach the liquid absorption component 35. After the liquid absorption component 35 absorbs the coolant, the coolant contacts the heat shrinkable film 40 in an annular shape.

[0062] By the liquid supply component 31 supplying the coolant to the liquid absorption component 35, the liquid absorption component 35 is in a wet state after absorbing the coolant. When the liquid absorption component 35 contacts the heat shrinkable film 40, the coolant contacts the heat shrinkable film 40 through the liquid absorption component 35, so as to cool the heat shrinkable film 40 by absorbing the heat of the heat shrinkable film 40 through the coolant. By the liquid absorption component 35 absorbing the coolant, the coolant is evenly distributed in the liquid absorption component 35, so that the coolant can evenly contact the heat shrinkable film 40, making the heat dissipation of the heat shrinkable film 40 more uniform and ensuring the product quality of the heat shrinkable film 40.

[0063] When the liquid absorption amount of the liquid absorption assembly 35 reaches saturation, during the process that the liquid supply assembly 31 continues to supply the coolant to the liquid absorption assembly 35, the coolant in the liquid absorption assembly 35 will continuously drain from the liquid absorption assembly 35 along with the continuous liquid supply of the liquid supply assembly 31, and the coolant drained from the liquid absorption assembly 35 is the coolant that absorbs the heat of the heat shrink film 40. Thus, through the continuous liquid supply of the liquid supply assembly 31, the coolant that has absorbed heat in the liquid absorption assembly 35 continuously drains from the liquid absorption assembly 35, thereby ensuring the continuous low temperature of the coolant in the liquid absorption assembly 35, enabling the coolant in the liquid absorption assembly 35 to continuously and evenly cool the heat shrink film 40, further ensuring the continuity of the heat shrink film 40 cooling process, improving production efficiency, and ensuring the product quality of the heat shrink film 40.

[0064] By making the liquid absorption assembly 35 surround and contact the heat shrink film 40, the coolant can evenly contact the heat shrink film 40, so that the heat shrink film 40 can dissipate heat evenly, ensuring the product quality of the heat shrink film 40.

[0065] In some embodiments of the present application, the coolant includes water.

[0066] In some embodiments of the present application, the liquid supply assembly 31 includes a liquid storage tank 32 for loading the coolant. The liquid storage tank 32 is provided with a liquid outlet 33 facing the liquid absorption assembly 35. By controlling the valve of the liquid outlet 33, the liquid output of the liquid outlet 33 can be controlled.

[0067] In some embodiments of the present application, the liquid absorption assembly 35 may include a liquid absorption member for surrounding and contacting the heat shrink film 40, and the liquid absorption member includes at least one of sponge, ordinary cloth strip, cotton cloth, and gauze.

[0068] In some embodiments of the present application, the liquid absorption assembly 35 further includes an annular bracket 36 sleeved on the heat shrink film 40, and the liquid absorption member adheres to the annular bracket 36.

[0069] In some embodiments of the present application, the liquid supply assembly 31 further includes a liquid collection tank 34 disposed below the liquid absorption assembly 35.

[0070] In the description of this specification, the descriptions with reference to terms such as "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0071] In addition, the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A PET heat shrink film forming device, characterized in that: include: a first cooling device, wherein the first cooling device cools the heat shrinkable film by airflow; a second cooling device, wherein the second cooling device cools the heat shrinkable film by means of a liquid; Wherein, in the process of cooling the heat shrinkable film, the film is first cooled by the first cooling device and then cooled by the second cooling device.

2. The PET heat shrink film forming equipment according to claim 1, characterized in that: The first cooling device includes an air guide component, and the air guide component is used to make the airflow for cooling the heat shrinkable film flow around the heat shrinkable film in a ring shape.

3. The PET heat shrink film forming equipment according to claim 2, characterized in that: The air guide component is provided with: an air flow channel, wherein the air flow channel is provided for air flow; An air inlet, the air inlet is connected to the air path of the air flow channel, and the air inlet is used to allow external air flow to enter the air flow channel; An air outlet, the air outlet is annular and connected to the air path of the air flow channel; Wherein, during the process of forming the heat shrinkable film, the heat shrinkable film passes through the annular range of the air outlet.

4. The PET heat shrink film forming equipment according to claim 3, characterized in that: The air outlet is provided with a guide portion, and the guide portion is used to change the angle between the air flow direction and the conveying direction of the heat shrink film.

5. The PET heat shrink film forming equipment according to claim 4, characterized in that: The guide portions are distributed in an annular shape, and the distribution center of the guide portions coincides with the annular center of the air outlet.

6. The PET heat shrink film forming equipment according to claim 4, characterized in that: The guide portion is provided with air leakage grooves, which are distributed in an annular shape, and the distribution center of the air leakage grooves coincides with the annular center of the air outlet.

7. The PET heat shrink film forming equipment according to claim 6, characterized in that: The size of the air leakage groove gradually increases along the conveying direction of the heat shrinkable film.

8. The PET heat shrink film forming equipment according to claim 3, characterized in that: The airflow channel is annular, and the annular center of the airflow channel coincides with the annular center of the air outlet.

9. The PET heat shrink film forming equipment according to claim 3, characterized in that: The number of the air inlets is at least three, and the air inlets are distributed in a ring shape, and the distribution center of the air inlets coincides with the ring center of the air outlet.

10. The PET heat shrink film forming equipment according to claim 1, characterized in that: The second cooling device comprises: A liquid supply component, the liquid supply component is used to provide cooling liquid to the heat shrink film; A liquid absorbing component, the liquid absorbing component is used to surround and contact the heat shrinkable film, and the liquid absorbing component can absorb the cooling liquid; Wherein, during the operation of the second cooling device, the liquid supply component allows the cooling liquid to reach the liquid absorption component, and after the liquid absorption component absorbs the cooling liquid, the cooling liquid contacts the heat shrink film in a ring shape.

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