Adhesive film forming device

Abstract

The utility model discloses an adhesive film forming device which comprises a bracket, a first roller wheel, a second roller wheel, a conveying belt, a mold, a heating device and a control unit, wherein the first roller wheel and the second roller wheel are oppositely arranged. The first roller and the second roller are rotationally mounted on the bracket; the first roller and the second roller are sleeved with the conveying belt. The mold is located above the conveying belt and used for extruding adhesive film fluid to the conveying belt; the heating device is positioned between the first roller and the second roller; the control unit is connected with the heating unit and used for controlling the heating device to be turned on or turned off according to the temperature of the adhesive film fluid. According to the utility model, the internal temperature distribution of the adhesive film fluid can be more uniform, so that the stress concentration in the adhesive film fluid can be conveniently removed, the shrinkage rate of the adhesive film fluid is effectively reduced, and the irregular bulging condition of the adhesive film fluid is reduced; meanwhile, the conveying belt is designed to be long enough, and it is effectively guaranteed that the thickness and mass distribution of adhesive film fluid are more uniform.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic packaging adhesive films, and in particular relates to an adhesive film forming device. Background Art

[0002] The existing photovoltaic film is mainly formed by rapidly cooling the film fluid extruded from the die through the low temperature of the cooling roller, but this method has certain defects. Since the film fluid is a polymer fluid, the temperature of the film fluid after extrusion through the die is high, and there is stress concentration in the polymer chain. If it is directly cooled by the cooling roller, the internal stress of the film fluid cannot be completely released, resulting in large fluctuations in the shrinkage rate and flatness of the film fluid.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0004] The utility model aims to provide a film forming device, which can make the temperature of the film fluid more uniform and eliminate the internal stress of the film fluid.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] A film forming device, the film forming device comprising:

[0007] Bracket;

[0008] A first roller and a second roller are arranged opposite to each other and are rotatably mounted on the bracket;

[0009] A conveyor belt, sleeved on the first roller and the second roller;

[0010] A mold, located above the conveyor belt, used for extruding a film fluid onto the conveyor belt;

[0011] A heating device is located between the first roller and the second roller;

[0012] The control unit is connected to the heating unit and is used to control the opening or closing of the heating device according to the temperature of the film fluid.

[0013] In one or more embodiments of the present invention, the heating device includes a plurality of lamp tubes, and the plurality of lamp tubes are distributed inside the conveyor belt in an array.

[0014] In one or more embodiments of the present invention, the distance between the lamp tube and the conveyor belt is 10 cm to 15 cm; and / or,

[0015] The distance between two adjacent lamp tubes along the film fluid transmission direction is 20 cm to 60 cm.

[0016] In one or more embodiments of the present utility model, the adhesive film forming device further comprises a first temperature detection unit for detecting the temperature of the adhesive film fluid on the conveyor belt;

[0017] The control unit is also used to: when the film fluid temperature detected by the first temperature detection unit is greater than or equal to the first temperature threshold, control the heating device to be turned off; when the film fluid temperature detected by the first temperature detection unit is less than the first temperature threshold, control the heating device to be turned on.

[0018] In one or more embodiments of the present invention, the first temperature threshold is any temperature value within the range of 60° C. to 70° C.

[0019] In one or more embodiments of the present invention, the adhesive film forming device further includes a first temperature control structure and a second temperature control structure, the first temperature control structure is thermally connected to the first roller, and the second temperature control structure is thermally connected to the second roller.

[0020] In one or more embodiments of the utility model, a first flow channel is provided in the first roller, and the first temperature control structure includes a first constant temperature box connected to the first flow channel, and a first heat transfer medium stored in the first constant temperature box;

[0021] The second roller is provided with a second flow channel, and the second temperature control structure includes a second constant temperature box connected with the second flow channel, and a second heat transfer medium stored in the second constant temperature box.

[0022] In one or more embodiments of the present utility model, the adhesive film forming device further includes a second temperature detection unit for detecting the temperature of the first roller and the second roller;

[0023] The control unit is also used to: when the first roller temperature detected by the second temperature detection unit is greater than or equal to the second temperature threshold, control the first temperature control structure to open; when the first roller temperature detected by the second temperature detection unit is less than the second temperature threshold, control the first temperature control structure to close; and when the second roller temperature detected by the second temperature detection unit is greater than or equal to the third temperature threshold, control the second temperature control structure to open; when the second roller temperature detected by the second temperature detection unit is less than the third temperature threshold, control the second temperature control structure to close.

[0024] In one or more embodiments of the present invention, the second temperature threshold is any temperature value within the range of 60°C to 85°C, and the third temperature threshold is any temperature value within the range of 60°C to 85°C.

[0025] In one or more embodiments of the present invention, the film forming device also includes a height adjustment mechanism, the bracket is fixedly installed on the height adjustment mechanism, the height adjustment mechanism includes a base, a screw rod rotatably installed in the base, and a sliding member provided on the screw rod, and the bracket is fixedly installed on the sliding member.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] The utility model provides a film forming device, which makes the internal temperature distribution of the film fluid more uniform by means of slow cooling, heat preservation and slow cooling again, so as to remove the stress concentration inside the film fluid, effectively reduce the shrinkage rate of the film fluid, and reduce the occurrence of irregular bulging of the film fluid; at the same time, the conveyor belt is designed to be long enough, which effectively ensures that the thickness and mass distribution of the film fluid are more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the front view of the film forming device in one embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the top view of the structure of the film forming device in one embodiment of the utility model. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0034] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.

[0035] Reference Figure 1 As shown, the film forming device in one embodiment of the utility model comprises: a bracket 1, a first roller 2 and a second roller 3 arranged opposite to each other, a conveyor belt 4, a mold 5, a heating device, and a control unit.

[0036] Among them, the first roller 2 and the second roller 3 are both rotatably installed on the bracket 1; the conveyor belt 4 is sleeved on the first roller 2 and the second roller 3; the mold 5 is located above the conveyor belt 4, and is used to extrude the film fluid 9 onto the conveyor belt 4; the heating device is located between the first roller 2 and the second roller 3; the control unit is connected to the heating unit, and is used to control the opening or closing of the heating device according to the temperature of the film fluid 9.

[0037] Since the mold 5 is located above the conveyor belt 4, the film fluid 9 squeezed out by the mold 5 will first fall a certain distance in the air, during which the film fluid 9 will exchange heat with the air to slowly cool down, and then the film fluid 9 will be transported by the conveyor belt 4, during which the film fluid 9 can be kept warm by the heating unit; after the film fluid 9 is transported away from the conveyor belt 4, it falls under the action of its own weight, during which it will again exchange heat with the air to slowly cool down.

[0038] According to this design, the internal temperature distribution of the film fluid 9 is made more uniform by slowly cooling down, then keeping warm, and then slowly cooling down again, so as to remove the stress concentration inside the film fluid 9, effectively reduce the shrinkage rate of the film fluid 9, and reduce the occurrence of irregular bulging of the film fluid 9; at the same time, the conveyor belt 4 is designed to be long enough, which effectively ensures that the thickness and mass distribution of the film fluid 9 are more uniform.

[0039] Among them, refer to Figure 2 As shown, the width of the film fluid 9 is smaller than the width of the conveyor belt 4 , preventing the film fluid 9 from flowing out of the conveyor belt 4 .

[0040] In order to ensure that the film fluid 9 and the conveyor belt 4 do not move or deflect laterally, a driving unit (not shown) is provided in this embodiment and is linked to the first roller 2 and the second roller 3. The driving unit can simultaneously control the first roller 2 and the second roller 3 to operate synchronously.

[0041] The thermal conductivity of the conveyor belt 4 in this embodiment is greater than 0 W / mK and less than or equal to 0.5 W / mK, and the conveyor belt 4 can be a glass fiber conveyor belt 4 or an aramid fiber composite material conveyor belt 4 or a polyvinylidene fluoride composite material conveyor belt 4. Therefore, the conveyor belt 4 has sufficient thermal fatigue resistance.

[0042] Preferably, the outer wall of the conveyor belt 4 in this embodiment is also covered with a non-stick layer (not shown). The non-stick layer may be a polytetrafluoroethylene non-stick layer or a polyetheretherketone non-stick layer. This can prevent the adhesive film fluid 9 from adhering to the conveyor belt 4, ensuring that the adhesive film fluid 9 and the conveyor belt 4 are easily separated.

[0043] In order to make the temperature distribution of the film fluid 9 on the conveyor belt 4 more uniform, refer to Figure 1 , Figure 2 As shown, the heating device includes a plurality of lamp tubes 40, and the plurality of lamp tubes 40 are distributed in an array inside the conveyor belt 4. Exemplarily, the lamp tubes 40 in this embodiment are distributed in a 2*3 array. Of course, the present application is not limited thereto. In other embodiments, when the length of the conveyor belt 4 and the diameters of the first roller 2 and the second roller 3 meet the requirements, the lamp tubes 40 may be distributed in an array of M*N (M≠2), or the lamp tubes 40 may be distributed in an array of M*N (N≠3), or the lamp tubes 40 may be distributed in an array of M*N (M≠2, and N≠3). Preferably, the power of a single lamp tube 40 is not higher than 5kW, which can both keep the film fluid 9 warm and reduce the manufacturing cost.

[0044] Specifically, the distance between the lamp tube 40 and the conveyor belt 4 is 10 cm to 15 cm. Exemplarily, the distance between the lamp tube 40 and the conveyor belt 4 in this embodiment is 15 cm. Of course, the present application is not limited thereto, and the distance between the lamp tube 40 and the conveyor belt 4 in other embodiments may be 10 cm, or 12.5 cm, or any value between 10 cm and 15 cm.

[0045] At the same time, the spacing between two adjacent lamp tubes 40 along the direction of transmission of the film fluid 9 is 20 cm to 60 cm. In this embodiment, the spacing between two adjacent lamp tubes 40 along the direction of transmission of the film fluid 9 is 40 cm. Of course, the present application is not limited thereto, and in other embodiments, the spacing between two adjacent lamp tubes 40 along the direction of transmission of the film fluid 9 can be 20 cm, or 60 cm, or any value between 20 cm and 60 cm.

[0046] According to this design, the temperature of the lamp tube 40 can be effectively transferred to the conveyor belt 4, so as to facilitate heat exchange with the film fluid 9 through the conveyor belt 4. While ensuring that the film fluid 9 is kept warm by the lamp tube 40, the number of lamp tubes 40 is reduced, thereby reducing the cost of the film forming device.

[0047] The film forming device also includes a first temperature detection unit (not shown) for detecting the temperature of the film fluid 9 on the conveyor belt 4; the control unit is also used to: when the temperature of the film fluid 9 detected by the first temperature detection unit is greater than or equal to the first temperature threshold, control the heating device to be turned off; when the temperature of the film fluid 9 detected by the first temperature detection unit is less than the first temperature threshold, control the heating device to be turned on. The first temperature detection unit can be a temperature gun or a thermometer, etc., to measure the temperature of the film fluid 9 transmitted to the conveyor belt 4. The first temperature threshold is any temperature value within the range of 60°C to 70°C.

[0048] Exemplarily, when the temperature gun detects that the temperature of the film fluid 9 transmitted to the conveyor belt 4 is less than 60°C, the lamp 40 is turned on to heat the film fluid 9 until the temperature of the film fluid 9 reaches 60°C. When the temperature gun detects that the temperature of the film fluid 9 transmitted to the conveyor belt 4 is greater than or equal to 70°C, the lamp 40 is turned off to avoid overheating and reduce energy consumption. Of course, the present application is not limited to this. In other embodiments, the first temperature threshold can also be 65°C, or any value within 60°C to 70°C.

[0049] Combination Figure 2 As shown, the film forming device in this embodiment further includes a first temperature control structure 6 and a second temperature control structure 7, wherein the first temperature control structure 6 is thermally connected to the first roller 2, and the second temperature control structure 7 is thermally connected to the second roller 3. According to this design, the surfaces of the first roller 2 and the second roller 3 can have a suitable temperature so as to facilitate heat exchange with the film fluid 9 transported thereon.

[0050] Specifically, refer to Figure 2 As shown, in this embodiment, the first roller 2 is provided with a first flow channel 21, and the first temperature control structure 6 includes a first constant temperature box 61 connected to the first flow channel 21, and a first heat transfer medium 62 stored in the first constant temperature box 61; the second roller 3 is provided with a second flow channel 31, and the second temperature control structure 7 includes a second constant temperature box 71 connected to the second flow channel 31, and a second heat transfer medium 72 stored in the second constant temperature box 71. Among them, the first heat transfer medium 62 and the second heat transfer medium 72 can be constant temperature water or constant temperature oil. Among them, the temperature of the first heat transfer medium 62 and the second heat transfer medium 72 can be 65℃~90℃. Since there is a certain distance between the first flow channel 21 and the surface of the first roller 2, when the first heat transfer medium 62 flows in the first flow channel 21 to exchange heat with the first roller 2, there will be heat loss, and finally the surface temperature of the first roller 2 can be guaranteed to be 60℃~85℃, so as to facilitate heat exchange with the film fluid 9.

[0051] Furthermore, the film forming device in this embodiment further includes a second temperature detection unit (not shown) for detecting the temperature of the first roller 2 and the second roller 3;

[0052] The control unit is also used to:

[0053] When the temperature of the first roller 2 detected by the second temperature detection unit is greater than or equal to the second temperature threshold, the first temperature control structure 6 is controlled to be opened; when the temperature of the first roller 2 detected by the second temperature detection unit is less than the second temperature threshold, the first temperature control structure 6 is controlled to be closed; and,

[0054] When the temperature of the second roller 3 detected by the second temperature detection unit is greater than or equal to the third temperature threshold, the second temperature control structure 7 is controlled to be opened; when the temperature of the second roller 3 detected by the second temperature detection unit is less than the third temperature threshold, the second temperature control structure 7 is controlled to be closed.

[0055] The second temperature detection unit may be a temperature gun or a thermometer, etc., to measure the temperature of the first roller 2 and the second roller 3. The second temperature threshold and the third temperature threshold may be configured according to the specific adhesive film. For example, the second temperature threshold is any temperature value within the range of 60°C to 85°C, and the third temperature threshold is any temperature value within the range of 60°C to 85°C. According to this design, it can be ensured that the temperature of the adhesive film fluid 9 when leaving the second roller 3 meets the production requirements.

[0056] Exemplarily, when the temperature gun detects that the temperature of the first roller 2 is less than 60°C, the first heat-conducting medium 62 flows into the first flow channel 21 to heat the first roller 2, thereby heating the film fluid 9 until the temperature of the film fluid 9 reaches 60°C. When the temperature gun detects that the temperature of the first roller 2 is greater than or equal to 70°C, the first heat-conducting medium 62 does not flow into the first flow channel 21 to avoid the first roller 2 from being too high and energy loss. Of course, the present application is not limited to this. In other embodiments, the second temperature threshold can also be 65°C, or any value within the range of 60°C to 70°C.

[0057] Exemplarily, when the temperature gun detects that the temperature of the second roller 3 is less than 65°C, the second heat-conducting medium 72 flows into the second flow channel 31 to heat the second roller 3, thereby heating the film fluid 9 until the temperature of the film fluid 9 reaches 65°C. When the temperature gun detects that the temperature of the second roller 3 is greater than or equal to 65°C, the second heat-conducting medium 72 does not flow into the second flow channel 31 to avoid the second roller 3 from being too high and energy loss. Of course, the present application is not limited to this. In other embodiments, the third temperature threshold can also be 70°C, or any value within 60°C to 70°C.

[0058] To adjust the height difference between the mold 5 and the conveyor belt 4, refer to Figure 1As shown, the film forming device in this embodiment also includes a height adjustment mechanism 8, the bracket 1 is fixedly installed on the height adjustment mechanism 8, the height adjustment mechanism 8 includes a base 81, a screw rod 82 rotatably installed in the base 81, and a sliding member 83 provided on the screw rod 82, and the bracket 1 is fixedly installed on the sliding member 83.

[0059] It can be seen from the above technical solutions that the utility model has the following beneficial effects:

[0060] The utility model provides a film forming device, which makes the internal temperature distribution of the film fluid more uniform by means of slow cooling, heat preservation and slow cooling again, so as to remove the stress concentration inside the film fluid, effectively reduce the shrinkage rate of the film fluid, and reduce the occurrence of irregular bulging of the film fluid; at the same time, the conveyor belt is designed to be long enough, which effectively ensures that the thickness and mass distribution of the film fluid are more uniform.

[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0062] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A film forming device, characterized in that: The film forming device comprises: Bracket; A first roller and a second roller are arranged opposite to each other and are rotatably mounted on the bracket; A conveyor belt, sleeved on the first roller and the second roller; A mold, located above the conveyor belt, used for extruding a film fluid onto the conveyor belt; A heating device is located between the first roller and the second roller; The control unit is connected to the heating unit and is used to control the opening or closing of the heating device according to the temperature of the film fluid.

2. The film forming device according to claim 1, characterized in that: The heating device comprises a plurality of lamp tubes, and the plurality of lamp tubes are distributed inside the conveyor belt in an array.

3. The film forming device according to claim 2, characterized in that: The distance between the lamp tube and the conveyor belt is 10 cm to 15 cm; and / or, The distance between two adjacent lamp tubes along the film fluid transmission direction is 20 cm to 60 cm.

4. The film forming device according to claim 1, characterized in that: The adhesive film forming device further comprises a first temperature detection unit for detecting the temperature of the adhesive film fluid on the conveyor belt; The control unit is also used to: when the film fluid temperature detected by the first temperature detection unit is greater than or equal to the first temperature threshold, control the heating device to be turned off; when the film fluid temperature detected by the first temperature detection unit is less than the first temperature threshold, control the heating device to be turned on.

5. The film forming device according to claim 4, characterized in that: The first temperature threshold is any temperature value within the range of 60° C. to 70° C.

6. The film forming device according to claim 1, characterized in that: The adhesive film forming device further comprises a first temperature control structure and a second temperature control structure, wherein the first temperature control structure is thermally connected to the first roller, and the second temperature control structure is thermally connected to the second roller.

7. The film forming device according to claim 6, characterized in that: The first roller is provided with a first flow channel, and the first temperature control structure includes a first constant temperature box connected to the first flow channel, and a first heat transfer medium stored in the first constant temperature box; The second roller is provided with a second flow channel, and the second temperature control structure includes a second constant temperature box connected with the second flow channel, and a second heat transfer medium stored in the second constant temperature box.

8. The film forming device according to claim 7, characterized in that: The film forming device further comprises a second temperature detection unit for detecting the temperature of the first roller and the second roller; The control unit is also used to: when the first roller temperature detected by the second temperature detection unit is greater than or equal to the second temperature threshold, control the first temperature control structure to open; when the first roller temperature detected by the second temperature detection unit is less than the second temperature threshold, control the first temperature control structure to close; and when the second roller temperature detected by the second temperature detection unit is greater than or equal to the third temperature threshold, control the second temperature control structure to open; when the second roller temperature detected by the second temperature detection unit is less than the third temperature threshold, control the second temperature control structure to close.

9. The film forming device according to claim 8, characterized in that: The second temperature threshold is any temperature value within the range of 60°C to 85°C, and the third temperature threshold is any temperature value within the range of 60°C to 85°C.

10. The film forming device according to claim 1, characterized in that: The film forming device also includes a height adjustment mechanism, the bracket is fixedly installed on the height adjustment mechanism, the height adjustment mechanism includes a base, a screw rod rotatably installed in the base, and a sliding member provided on the screw rod, and the bracket is fixedly installed on the sliding member.

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