A smoke evacuation structure for a PVB membrane extruder die

Abstract

This specification discloses a smoke extraction structure for a PVB film extruder die head, comprising two hollow cylindrical tubes located on both sides of the die head and arranged along the length of the die head; each hollow cylindrical tube has a through-hole air intake on an opposite side, which is a slender opening along the length of the die head, and the air intake range of the air intake can completely cover the die head; each hollow cylindrical tube also has multiple sub-exhaust ports, each of which is connected to a guide pipe for connecting to an exhaust device. Using a tubular structure for smoke extraction results in a more compact and smaller smoke extraction structure, which can be positioned closer to the die head outlet, effectively reducing interference with the die head structure itself. Furthermore, the closer distance between the air intake and each sub-exhaust port on the tubular structure increases exhaust efficiency. The relatively smaller outer surface area of ​​the tubular structure also reduces the amount of condensed liquid, decreasing the risk of dripping.

Description

Technical Field

[0001] Several embodiments of this specification relate to the field of PVB manufacturing equipment technology, specifically to the optimization of the exhaust structure at the die head of a PVB film extruder. Background Technology

[0002] PVB membranes are widely used in architectural glass, automotive glass and other products. PVB membrane laminated glass refers to laminated glass made by sandwiching a PVB interlayer between two or more pieces of glass. The membrane can reduce the amount of noise penetrating the glass, reduce the noise level, and achieve a sound insulation effect.

[0003] PVB resin is melted at high temperature and then extruded through a die using an extruder to obtain PVB films. During the extrusion process, especially when the extruder uses a wide die to manufacture wide PVB films, oil fumes are generated at the film exit point of the die, requiring timely cleaning. This is typically addressed using a fume extraction hood structure. For example, Chinese utility model patent CN205631326U discloses a high-efficiency, energy-saving fume extraction hood structure for a die. This structure uses flat hoods on both the front and rear sides of the die, with multiple fume extraction tubes on the hood to achieve balanced fume extraction. A guide channel is then used to guide and collect the condensed droplets from the film, preventing droplets from falling onto the film.

[0004] Regarding the aforementioned patented solution, since its hood is a flat, elongated structure, the air inlet of the individual smoke hood unit on the hood is far from the air inlet of the hood. Therefore, under the same suction power, the smoke exhaust efficiency of this structure is poor. Moreover, the flat hood is tilted towards the side closer to the mold head. When it draws in high-temperature smoke, the droplets condensed on the outer shell of the hood will slide down the hood onto the PVB membrane after accumulating to a certain extent, causing pollution. Utility Model Content

[0005] This specification provides a smoke extraction structure for the die head of a PVB film extruder. The structure uses a tubular structure to extract the smoke, making it more compact and allowing it to be positioned closer to the die head outlet. This effectively reduces interference with the die head's own structure. Furthermore, the tubular structure has a relatively small outer surface area, resulting in less condensed liquid and reducing the risk of dripping.

[0006] The technical solution is as follows:

[0007] This specification provides a smoke exhaust structure for a PVB film extruder die head, comprising two hollow circular tubes located on both sides of the die head and both arranged along the length of the die head;

[0008] Both hollow cylindrical tubes have air inlets that penetrate through them on opposite sides. The air inlets are elongated openings that are set along the length of the mold head, and the air inlet's suction range can completely cover the mold head.

[0009] Both hollow circular tubes are also provided with multiple sub-exhaust ports, and each sub-exhaust port is connected to a duct for connecting to the exhaust device.

[0010] As a preferred embodiment, the sub-exhaust outlet includes two first sub-exhaust outlets respectively disposed at both ends of the hollow circular tube and multiple second sub-exhaust outlets disposed on the wall of the hollow circular tube and evenly distributed along the length of the hollow circular tube.

[0011] As a preferred embodiment, the opening direction of each of the second sub-exhaust ports on any of the hollow circular tubes is inclined relative to the opening direction of the corresponding intake port.

[0012] As a preferred embodiment, the opening direction of the corresponding air intake on each of the two hollow circular tubes is inclined upward relative to the horizontal plane.

[0013] As a preferred embodiment, both hollow circular tubes are inclined relative to the horizontal plane.

[0014] As a preferred embodiment, the two hollow circular tubes have the same tilt angle and opposite tilt directions.

[0015] As a preferred option, the outer surfaces of both hollow tubes are polished.

[0016] As a preferred embodiment, the outer surface of both hollow circular tubes is coated with a hydrophobic material.

[0017] The beneficial effects of the technical solutions provided in some embodiments of this specification include at least the following:

[0018] The exhaust gas is extracted using a tubular structure, making the exhaust structure more compact and smaller. It can be positioned closer to the die head outlet, effectively reducing interference with the die head's own structure.

[0019] The tubular structure has a closer distance between the air intake and each sub-exhaust outlet, resulting in higher exhaust efficiency. When paired with a lower-power exhaust device, it can achieve the same smoke extraction effect as a flat structure hood.

[0020] The tubular structure has a relatively small outer surface area, resulting in less liquid condensation and reducing the risk of droplets falling. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the exhaust structure and the die head of a PVB film extruder provided in the embodiments of this specification, showing the positional relationship between the exhaust structure and the die head.

[0023] Figure 2 This is a side view of the exhaust structure and the die head structure of a PVB film extruder provided in the embodiments of this specification.

[0024] Figure 3 This is a schematic diagram of the die head, showing its adjustment mechanism.

[0025] Figure 4 This is a cross-sectional view of a hollow circular tube in the smoke exhaust structure of a PVB film extruder die head provided in the embodiments of this specification, showing the specific arrangement of the air intake and the second sub-exhaust port.

[0026] Figure 5 This is a front view of a hollow circular tube in a smoke exhaust structure for a PVB film extruder die provided in the embodiments of this specification, showing the mating relationship when the two hollow circular tubes are inclined.

[0027] In the diagram: 1. Die head; 11. Exit port; 12. Adjustment structure; 2. Hollow round tube; 21. Air inlet; 22. Sub-exhaust outlet; 221. First sub-exhaust outlet; 222. Second sub-exhaust outlet; 23. Air guide tube. Detailed Implementation

[0028] The technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings.

[0029] The terms "first," "second," "third," etc., in the description, claims, and accompanying drawings are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0030] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the described elements without departing from the scope of this specification. Various processes or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

[0031] A smoke exhaust structure for the die head of a PVB film extruder.

[0032] Reference Figure 1 and attached Figure 2 , Figure 1 This is a schematic diagram of the smoke exhaust structure and the structure of the die head 1 for a PVB film extruder die head provided in the embodiments of this specification. Figure 2 This is a side view of the exhaust structure and the structure of the die head 1 for a PVB film extruder die head provided in the embodiments of this specification.

[0033] The smoke exhaust structure includes two hollow circular pipes 2 located on both sides of the mold head 1 and arranged along the length of the mold head 1;

[0034] Each of the two hollow round tubes 2 has a through-hole air inlet 21 on one side. The air inlet 21 is a long and narrow opening along the length of the mold head 1, and the air inlet 21 can completely cover the mold head 1.

[0035] Each of the two hollow circular tubes 2 is also provided with multiple sub-exhaust ports 22, and each sub-exhaust port 22 is connected to a guide pipe 23 for connecting to the exhaust device.

[0036] Explanatoryly, a tubular structure is used for smoke extraction, resulting in a more compact and smaller smoke extraction structure. This allows it to be positioned closer to the mold head 1 outlet 11, effectively reducing interference with the mold head 1's own structure. Furthermore, the closer distance between the suction port 21 and each sub-exhaust port 22 on the tubular structure increases exhaust efficiency. Combined with a lower-power exhaust device, it can achieve the same smoke extraction effect as a flat-structure hood. Additionally, the relatively small outer surface area of ​​the tubular structure results in less condensed liquid, reducing the risk of dripping.

[0037] Understandably, the hollow tube 2 can be made of materials such as steel pipe, which are required to be heat-resistant and not easily corroded. The exhaust power of the exhaust device should be adjusted according to the distance between the air inlet 21 and the extruder die head 1. The smaller the distance, the lower the exhaust power should be to avoid excessive adsorption on the PVB film, which would cause the PVB film to vibrate.

[0038] like Figure 3 As shown, Figure 3This is a schematic diagram of the mold head 1, showing the adjustment structure 12 of the mold head 1. The mold head 1 has an adjustment structure 12 on one side for adjusting the distance between the film outlets 11. Using a hood-type exhaust structure would obstruct the adjustment structure 12, causing inconvenience, or it might be unable to be placed near the film outlets 11 due to bolt restrictions, and could only be placed above the adjustment structure 12. However, this could cause grease to drip onto the high-temperature conducting bolts, potentially igniting a fire and posing a fire hazard. A compact and small tubular exhaust structure, on the other hand, can be easily placed below the adjustment structure 12, closer to the film outlets 11, improving exhaust efficiency and avoiding interference with the normal adjustment of the mold head 1.

[0039] In one embodiment of this specification, the sub-exhaust vent 22 includes two first sub-exhaust vents 221 respectively disposed at both ends of the hollow circular tube 2 and a plurality of second sub-exhaust vents 222 disposed on the wall of the hollow circular tube 2 and evenly distributed along the length of the hollow circular tube 2.

[0040] Explanatoryly, during the production of PVB film, the amount of smoke generated at each point of the die head 1 outlet 11 is basically uniform. The even distribution of sub-exhaust ports 22 at both ends and on the pipe wall of the hollow circular tube 2 can make the suction intensity at each point of the slender suction port 21 more uniform.

[0041] In one embodiment of this specification, the opening direction of each second sub-exhaust port 222 on any hollow circular tube 2 is inclined relative to the opening direction of the corresponding air intake port 21.

[0042] Explanatory, combined with appendix Figure 4 , Figure 4 This is a cross-sectional view of the hollow circular tube 2 in the exhaust structure of a PVB film extruder die provided in this embodiment of the specification, showing the specific arrangement of the air intake 21 and the second sub-exhaust port 222. The second sub-exhaust port 222 is not directly opposite the air intake 21. When arranged in a non-directly opposite manner, the airflow forms a vortex within the steel tube, mixing the suction power of each second sub-exhaust port 222. This further improves the uniformity of suction intensity at various points of the slender air intake 21, alleviating the problem of suction power attenuation in the area between two adjacent second sub-exhaust ports 222. Furthermore, the airflow forms a strong spiral flow field within the tube, and the secondary flow generated by the vortex continuously sweeps across the inner wall of the hollow circular tube 2 and the air intake 21 to prevent the accumulation of grease and grime.

[0043] The angle between the opening direction of the second exhaust port 222 and the opening direction of the intake port 21 is preferably 30°-45°.

[0044] It is understandable that a non-directly facing arrangement will result in a loss of suction pressure, thus requiring a more powerful exhaust device to achieve the same suction power as a direct-facing arrangement.

[0045] In one embodiment of this specification, the opening direction of the corresponding air inlets 21 on the two hollow circular tubes 2 is inclined upward relative to the horizontal plane.

[0046] Explanatory, this prevents the grease on the inner wall of the hollow tube 2 from flowing out of the air intake 21 after the exhaust device is stopped.

[0047] In one embodiment of this specification, both hollow circular tubes 2 are inclined relative to the horizontal plane.

[0048] Explanatory, combined with appendix Figure 5 , Figure 5 This is a front view of the hollow circular tube 2 in the exhaust structure of a PVB film extruder die provided in the embodiments of this specification, showing the mating relationship when the two hollow circular tubes 2 are inclined. Setting the hollow circular tubes 2 at a small angle to the horizontal plane can guide the droplets condensed on the outer wall of the hollow circular tubes 2 to flow along the inclined direction of the hollow circular tubes 2 after they accumulate to a certain extent, thereby avoiding the droplets from sliding onto the PVB film and causing contamination.

[0049] In one embodiment of this specification, the two hollow circular tubes 2 have the same tilt angle and opposite tilt directions.

[0050] Explanatoryly, when the hollow tube 2 is tilted, the suction intensity at different positions of the die head 1 outlet 11 will be different. The two hollow tubes 2 on both sides of the die head 1 have the same tilt angle but opposite tilt directions, which can complement the differences in suction intensity generated by each to maintain suction uniformity.

[0051] In one embodiment of this specification, the outer surfaces of both hollow circular tubes 2 are polished.

[0052] Explained, polishing the outer surface of the hollow cylindrical tube 2 effectively mitigates droplet condensation on the outer wall. A rough surface contains more microscopic depressions, cracks, or protrusions, which lower the critical radius required for the formation of stable liquid nuclei, providing more preferential nucleation sites. Therefore, it is easier to capture water vapor molecules, resulting in more condensed droplets, and vice versa. This reduces the risk of droplets falling onto the PVB membrane and causing contamination.

[0053] In one embodiment of this specification, the outer surfaces of both hollow circular tubes 2 are coated with a hydrophobic material.

[0054] By utilizing the self-cleaning function of hydrophobic materials, an air layer is locked between the solid and liquid interfaces to form a gas-liquid composite interface, reducing the solid-liquid contact area. Water vapor needs a higher degree of supersaturation to nucleate and condense on the outer wall of the hollow circular tube 2, reducing the risk of droplets falling onto the PVB membrane and causing pollution.

[0055] The above embodiments are merely preferred embodiments described in this specification and are not intended to limit the scope of this specification. Any modifications and improvements made by those skilled in the art to the technical solutions of this specification without departing from the spirit of this specification should fall within the protection scope defined by the claims of this specification.

Claims

1. A smoke evacuation structure for a PVB membrane extruder die, characterized by, It includes two hollow round tubes (2) located on both sides of the mold head (1) and both arranged along the length direction of the mold head (1); Both hollow tubes (2) have air inlets (21) that penetrate through them on opposite sides. The air inlets (21) are long and narrow openings that are set along the length of the mold head (1), and the air inlet (21) can completely cover the mold head (1). Both hollow circular tubes (2) are also provided with multiple sub-exhaust ports (22), and each sub-exhaust port (22) is connected to a guide pipe (23) for connecting the exhaust device.

2. A smoke evacuation structure for a PVB membrane extruder die according to claim 1, wherein, The sub-exhaust vent (22) includes two first sub-exhaust vents (221) respectively located at both ends of the hollow circular tube (2) and multiple second sub-exhaust vents (222) located on the wall of the hollow circular tube (2) and evenly distributed along the length of the hollow circular tube (2).

3. A smoke evacuation structure for a PVB membrane extruder die according to claim 2, wherein, The opening direction of each of the second sub-exhaust ports (222) on any of the hollow circular tubes (2) is inclined relative to the opening direction of the corresponding air intake port (21).

4. A smoke evacuation structure for a PVB membrane extruder die according to claim 1, wherein, The opening direction of the corresponding air inlet (21) on each of the two hollow round tubes (2) is inclined upward relative to the horizontal plane.

5. A smoke evacuation structure for a PVB membrane extruder die according to claim 1, wherein, Both hollow circular tubes (2) are inclined relative to the horizontal plane.

6. A smoke evacuation structure for a PVB membrane extruder die according to claim 5, wherein, The two hollow circular tubes (2) have the same tilt angle and opposite tilt directions.

7. A smoke evacuation structure for a PVB membrane extruder die according to claim 1, wherein, The outer surfaces of both hollow round tubes (2) are polished.

8. A smoke evacuation structure for a PVB membrane extruder die according to claim 1, wherein, Both hollow circular tubes (2) have a hydrophobic coating on their outer surfaces.

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