Cooling assembly after stretching of a pe film by mdo
By optimizing the cooling components after PE film MDO stretching, and adopting a combination of a dual air outlet structure and a water-cooled plate, the problem of uneven heat dissipation of PE film after MDO stretching was solved, achieving uniform cooling and stable delivery, avoiding deformation and warping, and improving molding quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YONGXIN STOCK (HUANGSHAN) PACKAGING CO LTD
- Filing Date
- 2025-06-10
- Publication Date
- 2026-07-10
AI Technical Summary
If the heat generated by the PE film after stretching in MDO is not cooled in time, it will cause wrinkling and deformation during molding. Existing cooling methods may cause localized sudden cooling shrinkage or warping, uneven thickness and wind force will cause deformation.
The air-cooled component adopts a dual-outlet structure and combines water-cooled plates to optimize cooling, ensuring uniform distribution of cooling air and forming a laminar flow air curtain on the membrane surface. Guide rollers are used to support and counteract wind pressure to avoid vibration, while water-cooled plates are used to regulate air temperature and enhance heat dissipation.
It effectively prevents the membrane material from curling and deforming due to sudden temperature drops and uneven heat dissipation, improves heat dissipation uniformity and efficiency, and ensures the stability and forming quality of the membrane material during the cooling process.
Smart Images
Figure CN224476444U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PE film processing technology, specifically a cooling component for PE film after MDO stretching. Background Technology
[0002] MDO stretching of PE film refers to a process of longitudinally stretching PE film. It involves heating the PE film to a temperature range near its softening temperature but below its melting point, and then applying external force longitudinally to stretch it, causing the polymer chains in the film to align and orient themselves along the stretching direction.
[0003] Because PE film generates a large amount of heat after MDO stretching, failure to cool it can lead to wrinkling and deformation during subsequent molding processes. Existing PE film cooling methods, such as those described in Chinese Patent Publication No. CN211542359U (titled "A Novel MDO Stretching Structure") and CN110524855B (titled "MDO Stretching Device for Blown Film Breathing Production Line"), mostly employ water-cooled cooling rollers. However, in practice, if the cooling roller temperature is too low or contact is poor, it can cause localized rapid cooling and shrinkage of the film, resulting in internal stress or warping. Furthermore, if the stretched PE film has uneven thickness, water cooling may exacerbate deformation. Conversely, directly using a fan to cool the PE film can cause significant shaking due to wind force, also leading to deformation. Therefore, solutions are urgently needed. Utility Model Content
[0004] In order to avoid and overcome the technical problems existing in the prior art, this utility model provides a cooling component for PE film after MDO stretching, which optimizes the air cooling structure, not only to cool the PE film, but also to effectively reduce the vibration of the PE film during the air cooling process.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A cooling assembly for a PE film after MDO stretching includes a guide roller that guides the film material at the lower part of the film material. A cooling box is arranged beside the guide roller. The cooling box has a first air outlet and a second air outlet that blows air outward. Both the first air outlet and the second air outlet are elongated holes arranged along the length of the guide roller. The air outlet of the first air outlet points towards the point where the film material is attached to the guide roller. The air outlet of the second air outlet is tangent to the outer periphery of the guide roller and is in the same direction as the output direction of the film material after passing through the guide roller.
[0007] As a further embodiment of this utility model, it also includes a distribution pipe connected to the fan and supplying air into the air-cooled box. The distribution pipe is arranged parallel to the guide roller, and at least two air nozzles connected to the air-cooled box are arranged on the distribution pipe along the axial direction of the distribution pipe.
[0008] As a further improvement of this utility model: the interior of the air-cooled box is equipped with water-cooled plates arranged in the flow path of the cooling air.
[0009] As a further embodiment of this utility model: the inner cavity of the air-cooled box is divided by a water-cooled plate to form an air supply cavity and an air exhaust cavity. The water-cooled plate is provided with through holes for conveying cooling air from the air supply cavity to the air exhaust cavity, and the through holes have a honeycomb structure.
[0010] As a further improvement of this utility model, an air distribution plate is installed at the second air outlet.
[0011] As a further embodiment of this utility model: an extension plate extending along the conveying direction of the membrane material after passing through the guide roller is arranged on the side of the second air outlet away from the membrane material, and an equidistant flow channel is formed between the extension plate and the membrane material to allow cooling air to flow.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] 1. A dual air outlet structure with a first and a second air outlet is adopted. The airflow from the first air outlet is directed towards the contact point between the membrane material and the guide roller. The guide roller supports the membrane material, counteracting the air pressure from the cooling airflow at the first outlet. This achieves heat dissipation for the membrane material without causing it to vibrate. The airflow from the second air outlet is directed in the same direction as the membrane material after passing through the guide roller. The cooling airflow generated by the second air outlet forms a laminar airflow curtain, preventing direct airflow from disturbing the membrane material and accelerating heat exchange on the membrane surface. Furthermore, the dual air outlet mechanism compensates for the shortcomings of air cooling compared to liquid cooling, preventing sudden temperature drops during cooling and improving the uniformity of heat dissipation. This effectively prevents edge curling and deformation of the membrane material caused by sudden temperature drops and uneven heat dissipation.
[0014] 2. At least two air nozzles connected to the air-cooled box along the axial direction of the guide roller on the diversion pipe make the cooling air more evenly distributed inside the air-cooled box, and make the first air outlet and the second air outlet more evenly discharge air along the length of the guide roller.
[0015] 3. The interior of the cold box is equipped with water-cooled plates arranged in the flow path of the cooling air. When the temperature of the cooling air is high, the water-cooled plates can be cooled down, thereby improving the heat dissipation effect on the membrane material.
[0016] In addition, the water-cooled plate is equipped with through holes for cooling air to pass through, and the through holes have a honeycomb structure, which improves the uniformity of cooling air cooling; at the same time, it effectively increases the contact area between the cooling air and the water-cooled plate, thereby improving the heat dissipation effect of the cooling air.
[0017] 4. An extension plate is arranged on the side of the second air outlet away from the membrane material, extending along the conveying direction of the membrane material after passing through the guide roller. An equidistant flow channel is formed between the extension plate and the membrane material to allow the cooling air to flow, which extends the travel distance of the cooling air along the conveying direction of the membrane material and further improves the heat dissipation effect on the membrane material. Attached Figure Description
[0018] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0019] Figure 2 This is a schematic diagram of the internal structure of the cold box in this utility model.
[0020] Figure 3 This is a right-side structural schematic diagram of the cold box of this utility model.
[0021] In the figure: 10, air-cooled box; 11, extension plate; 12, first air outlet; 13, second air outlet; 20, splitter pipe; 21, air nozzle; 30, water-cooled plate; 31, through hole; 40, air distribution plate; 50, guide roller; a, membrane material. Detailed Implementation
[0022] 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.
[0023] For ease of understanding, the specific structure and working method of this utility model are further described below with reference to the accompanying drawings:
[0024] The specific structure of this utility model is as follows: Figure 1-3As shown, its main structure includes a guide roller 50 that guides the membrane material a at the lower part of the membrane material a and an air-cooled box 10 arranged beside the guide roller 50. The air-cooled box 10 has a first air outlet 12 and a second air outlet 13 that blows air outwards. Both the first air outlet 12 and the second air outlet 13 are elongated holes arranged along the length of the guide roller 50, allowing cooling air to cover the membrane material a along the length of the guide roller 50. The air outlet 12 points towards the contact point between the membrane material a and the guide roller 50. By using the guide roller 50 to support the membrane material a, the air pressure under the cooling air from the first air outlet 12 can be counteracted, achieving heat dissipation of the membrane material a without causing it to vibrate. Furthermore, the air outlet 13 is tangential to the outer periphery of the guide roller 50 and runs in the same direction as the output direction of the membrane material a after passing through the guide roller 50. Since the cooling air generated by the second air outlet 13 does not blow directly onto the surface of the membrane material a at an angle, the pressure on the membrane material a is negligible. Under the tension of the guide roller 50, the membrane material a can effectively remain stable and without shaking. Although the cooling air generated by the second air outlet 13 is parallel to the conveying direction of the membrane material a, and forms a laminar air curtain to avoid direct blowing and disturbing the membrane material, it also accelerates the airflow speed on the surface of the membrane material a and accelerates the heat exchange on the surface of the membrane material a. By optimizing the air outlet direction of the first air outlet 12 and the second air outlet 13, not only will the membrane material a not shake, but the dual-air outlet heat dissipation structure also makes up for the shortcomings of air cooling in terms of heat dissipation effect compared with liquid cooling. It will also prevent the temperature from dropping suddenly during cooling and improve the uniformity of heat dissipation, effectively preventing the edge curling and deformation problem of membrane material a due to sudden temperature drop and uneven heat dissipation.
[0025] Based on the above, such as Figure 2 and Figure 3 As shown, it also includes a distribution pipe 20 connected to the fan and supplying air into the air-cooled box 10. The distribution pipe 20 is arranged parallel to the guide roller 50, and at least two air nozzles 21 connected to the air-cooled box 10 are arranged on the distribution pipe 20 along the axial direction of the distribution pipe 20, so that the cooling air is more evenly distributed inside the air-cooled box 10, and the first air outlet 12 and the second air outlet 13 can discharge air more evenly along the length direction of the guide roller 50. Of course, in actual implementation, the cooling air in the air-cooled box 10 can also be produced by directly connecting to the blower or by installing a blower in the inner cavity.
[0026] Based on the above, such as Figure 2 As shown, the interior of the air-cooled box 10 is equipped with a water-cooled plate 30 located in the flow path of the cooling air. When the temperature of the cooling air is high, the water-cooled plate 30 can be cooled down, thereby improving the heat dissipation effect on the membrane material a.
[0027] Specifically, such as Figure 2As shown, the inner cavity of the air-cooled box 10 is divided into an air supply cavity and an air exhaust cavity by a water-cooled plate 30. The water-cooled plate 30 is provided with through holes 31 for conveying cooling air from the air supply cavity to the air exhaust cavity, and the through holes 31 have a honeycomb structure, which improves the uniformity of cooling air cooling. At the same time, it effectively increases the contact area between the cooling air and the water-cooled plate 30, thereby improving the heat dissipation effect of the cooling air.
[0028] Based on the above, such as Figure 2 and Figure 3 As shown, an air distribution plate 40 is installed at the second air outlet 13. This air distribution plate 40 is existing technology and can be referenced from the air outlet structure of an air conditioner. It can evenly guide the turbulent airflow along a fixed direction to ensure the consistency between the air outlet direction of the second air outlet 13 and the conveying direction of the membrane material a.
[0029] Based on the above, such as Figure 2 As shown, an extension plate 11 is arranged on the side of the second air outlet 13 away from the membrane material a, extending along the conveying direction of the membrane material a after passing through the guide roller 50. An equidistant flow channel for cooling air to flow is formed between the extension plate 11 and the membrane material a, which extends the travel distance of the cooling air along the conveying direction of the membrane material a and further improves the heat dissipation effect on the membrane material a.
[0030] Of course, those skilled in the art will recognize that this invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
[0032] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.
Claims
1. A cooling assembly for a PE film after MDO stretching, characterized in that, The device includes a guide roller (50) that guides the membrane (a) at the lower part of the membrane (a). A cooling box (10) is arranged on the side of the guide roller (50). The cooling box (10) has a first air outlet (12) and a second air outlet (13) that blows air outward. Both the first air outlet (12) and the second air outlet (13) are elongated holes arranged along the length of the guide roller (50). The air outlet of the first air outlet (12) points to the contact point between the membrane (a) and the guide roller (50). The air outlet of the second air outlet (13) is tangent to the outer periphery of the guide roller (50) and is in the same direction as the output direction of the membrane (a) after passing through the guide roller (50).
2. The cooling assembly for a PE film after MDO stretching according to claim 1, characterized in that, It also includes a split pipe (20) that is connected to the fan and supplies air into the air-cooled box (10). The split pipe (20) is arranged parallel to the guide roller (50) and along the axial direction of the split pipe (20), at least two air nozzles (21) connected to the air-cooled box (10) are arranged on the split pipe (20).
3. A cooling assembly for a PE film after MDO stretching according to claim 1 or 2, characterized in that, The interior of the air-cooled box (10) is equipped with water-cooled plates (30) arranged in the flow path of the cooling air.
4. The cooling assembly for a PE film after MDO stretching according to claim 3, characterized in that, The air-cooled box (10) is divided into an air supply chamber and an air exhaust chamber by a water-cooled plate (30). The water-cooled plate (30) is provided with through holes (31) for conveying cooling air from the air supply chamber to the air exhaust chamber, and the through holes (31) have a honeycomb structure.
5. A cooling assembly for a PE film after MDO stretching according to claim 1 or 2, characterized in that, An air distribution plate (40) is installed at the second air outlet (13).
6. A cooling assembly for a PE film after MDO stretching according to claim 1 or 2, characterized in that, An extension plate (11) is arranged on the side away from the membrane material (a) at the second air outlet (13), extending along the conveying direction of the membrane material (a) after passing through the guide roller (50), and an equidistant flow channel is formed between the extension plate (11) and the membrane material (a) to allow cooling air to flow.