A white backing film and its backing film stretching equipment

Abstract

This invention belongs to the technical field of backsheet base film production equipment, and particularly relates to a white backsheet base film and its backsheet base film stretching equipment, comprising: a box body with a cavity inside; a stretching assembly disposed within the cavity; a material guiding assembly disposed on both side walls of the cavity and guiding the backsheet through the stretching assembly; a temperature control device disposed within the cavity; wherein, a vacuum device is disposed on the upper side of the box body.

Description

Technical Field

[0001] This invention belongs to the technical field of backsheet base film production equipment, and particularly relates to a white backsheet base film stretching equipment. Background Technology

[0002] A solar panel has five layers in its cross-section: photovoltaic glass, EVA, solar cells, EVA, and backsheet. The solar backsheet is located on the back of the solar panel and protects and supports the cells. It has reliable insulation, water resistance, and aging resistance. It generally has a three-layer structure (PVDF / PET / PVDF). The outer protective layer PVDF has good resistance to environmental corrosion, the middle layer is PET polyester film with good insulation properties, and the inner layers PVDF and EVA have good adhesion properties.

[0003] In order to improve the performance of existing backsheet base films after production, they are often stretched. However, existing factories often carry out the stretching process in an open environment, which is easily affected by the external environment. Therefore, we have specially designed a white backsheet base film and its stretching equipment. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a white backing film stretching device, which improves the stretching environment of the backing film.

[0005] In view of this, the present invention provides a white backing film and a backing film stretching device thereof, comprising:

[0006] The enclosure contains a cavity.

[0007] A tensioning assembly is disposed within the cavity;

[0008] The material guiding assembly is disposed on both sides of the cavity and guides the back plate through the stretching assembly;

[0009] Temperature control device, which is installed inside the cavity;

[0010] The upper side of the enclosure is equipped with a vacuum pump.

[0011] In the above technical solution, the stretching component further includes:

[0012] Stretch roller;

[0013] Feeding roller;

[0014] Take-up roller;

[0015] The feeding roller and the receiving roller are located at both ends of the cavity and are connected to motors. Multiple stretching rollers are arranged between the feeding roller and the receiving roller. The material guiding component guides the back plate base film to pass through the multiple stretching rollers in an alternating manner.

[0016] The stretching roller includes:

[0017] A rotating shaft with turntables connected to both ends, the turntables being fixed to the cavity wall;

[0018] Two fixed disks are symmetrically arranged on the rotating shaft, and multiple slots are arranged in a circumferential array on the fixed disks, with columns installed in the slots;

[0019] A tensioning frame is connected to the slot and to the column, and a spring is installed on the column inside the tensioning frame.

[0020] In the above technical solution, the material guiding component further includes:

[0021] Guide rails are set on the walls on both sides of the cavity;

[0022] A magnetic drive unit is mounted on a guide rail and connected to a clamping component.

[0023] In the above technical solution, the magnetic driving component further includes:

[0024] Magnetic modules are laid on the guide rails;

[0025] The suspension component is mounted on the guide rail and connected to the clamping component. The suspension component works in conjunction with the magnetic module.

[0026] The controller is connected to the magnetic module and controls the change of the positive and negative poles of the magnetic module.

[0027] In the above technical solution, the magnetic module further includes:

[0028] The main body has grooves on it;

[0029] The adhesive block is attached to the groove.

[0030] The main body is an electromagnet.

[0031] Furthermore, in the above technical solution, each individual magnetic module is individually controlled by a controller.

[0032] In the above technical solution, the levitation component further includes:

[0033] The bracket has a first branch and a second branch at one end;

[0034] Rollers are provided on both the first and second branches;

[0035] A magnetic block is positioned between the first and second branches, and magnetically engages with the magnetic module.

[0036] The roller has a rubber sleeve on its outer side, and the rubber sleeve has toothed protrusions.

[0037] In the above technical solution, the clamping component further includes:

[0038] Connecting plate, with both ends of the connecting plate connected to the second branch;

[0039] The clamping plate is set on the connecting plate and is engaged with the connecting plate by bolts.

[0040] Furthermore, the above technical solution also includes:

[0041] Limiting protrusions are set on the guide rail, and the main body is set between the limiting protrusions.

[0042] In the above technical solution, a white backing film with one side coated and the other side composite has stable light transmittance on both the composite and coated sides after stretching.

[0043] The beneficial effects of this invention are as follows: the vacuum equipment performs vacuum operation on the cavity, thereby stretching the backing film in a vacuum environment. At the same time, the vacuum environment in the cavity helps the temperature control device to regulate the temperature, thereby saving energy consumption and effectively reducing the impact of the processing environment on the stretching of the backing film. Furthermore, precise temperature control helps to improve the stretching effect of the backing film. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the present invention;

[0045] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0046] Figure 3 This is a schematic diagram of the magnetic drive component of the present invention;

[0047] Figure 4 This is a schematic diagram of the stretching roller of the present invention;

[0048] Figure 5 This is the controller control logic diagram of the present invention;

[0049] The markings in the diagram represent: 1. Box body; 11. Cavity; 2. Stretching assembly; 21. Stretching roller; 211. Rotating shaft; 212. Fixed plate; 2121. Groove; 2122. Column; 213. Stretching frame; 214. Spring; 22. Feeding roller; 23. Receiving roller; 3. Guide assembly; 31. Guide rail; 32. Magnetic drive component; 321. Magnetic module; 3211. Body; 3212. Glue block; 322. Suspension assembly; 3221. Support; 32211. First branch; 32222. Second branch; 3223. Roller; 3224. Magnetic block; 333. Controller; 34. Clamping component; 341. Connecting plate; 342. Clamping plate; 4. Temperature control device; 5. Limiting protrusion; 6. First movable door; 7. Second movable door; 8. Third movable door. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0051] Example 1:

[0052] This embodiment provides a white backing film and a backing film stretching device thereof, including:

[0053] Box 1, with a cavity 11 inside;

[0054] Tensioning component 2 is disposed within cavity 11;

[0055] The material guiding assembly 3 is disposed on both sides of the cavity 11 and guides the back plate through the stretching assembly 2;

[0056] Temperature control device 4 is installed inside cavity 11;

[0057] The upper side of the housing 1 is equipped with a vacuum pump.

[0058] As can be seen from this embodiment, a white backing base film and its backing base film stretching equipment include a box 1, a stretching component 2, a material guiding component 3, and a vacuuming device;

[0059] The chamber 1 has a cavity 11 formed inside, and a vacuum pump and a temperature control device 4 are installed on the chamber 1.

[0060] Furthermore, a sealed first movable door 6 is provided on one side of the housing 1. During use, the back panel base film roll is placed into the cavity 11 through the first movable door 6.

[0061] The stretching assembly 2 is installed in the cavity 11. The stretching assembly 2 is connected to the back plate base film roll and stretches the back plate base film roll.

[0062] The material guiding assembly 3 is installed in the cavity 11 and passes through the stretching assembly 2 in an alternating manner, thereby extending the travel distance of the back sheet base film roll on the stretching assembly 2, which helps to improve the stretching effect.

[0063] During use, the vacuum equipment performs vacuum operation on the cavity 11, so that the backing base film is stretched in a vacuum environment. At the same time, the vacuum environment in the cavity 11 helps the temperature control device 4 to regulate the temperature, thereby saving energy consumption and effectively reducing the impact of the processing environment on the stretching of the backing base film. Furthermore, precise temperature control helps to improve the stretching effect of the backing base film.

[0064] Example 2:

[0065] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0066] The stretching component 2 includes:

[0067] Stretch roller 21;

[0068] Feeding roller 22;

[0069] 23 receiving rollers;

[0070] The feeding roller 22 and the receiving roller 23 are located at both ends of the cavity 11 and are both connected to a motor. Multiple stretching rollers 21 are arranged between the feeding roller 22 and the receiving roller 23. The material guiding component 3 guides the back plate base film to pass through multiple stretching rollers 21 in an alternating manner.

[0071] The stretching roller 21 includes:

[0072] A rotating shaft 211 is provided, with turntables connected to both ends of the shaft 211. The turntables are fixed to the wall of the cavity 11.

[0073] Two fixed disks 212 are symmetrically arranged on the rotating shaft 211, and multiple slots 2121 are arranged in a circumferential array on the fixed disks 212, with columns 2122 arranged in the slots 2121;

[0074] The tension frame 213 is connected to the slot 2121 and to the column 2122, and a spring 214 is provided on the column 2122 inside the tension frame 213.

[0075] As can be seen from this embodiment,

[0076] As can be seen from this embodiment, the stretching assembly 2 includes a stretching roller 21, a feeding roller 22, and a receiving roller 23;

[0077] The feeding roller 22 is installed on one side of the housing 1 with the first movable door 6, the receiving roller 23 is installed at the other end, and the stretching roller 21 is installed between the feeding roller 22 and the stretching roller 21. Furthermore, the housing 1 is provided with a sealed second movable door 7 corresponding to the receiving roller 23, and the two ends of the housing 1 are provided with a third movable door 8 corresponding to the feeding roller 22 and the receiving roller 23. The third movable door 8 is used to cooperate with the material guiding assembly 3 to clamp the back plate base film.

[0078] In use, the backing film roll is placed into the housing 1 through the first movable door 6 and connected to the feeding roller 22. The guide assembly 3 moves to one end of the feeding roller 22. After the backing film roll is manually fixed to the guide assembly 3 through the first movable door 6, the guide assembly 3 guides the backing film to the take-up roller 23. The backing film is then manually fixed to the take-up roller 23 through the second movable door 7. At this time, the motor at the take-up roller 23 is started. The take-up roller 23 rolls the backing film through the stretching roller 21 and stretches it. After the take-up roller has completely rolled up the backing film, the motor at the take-up roller can be turned off and the motor at the feeding roller 22 can be started to retract the backing film. During the retraction process, the backing film is stretched a second time to improve the stretching effect.

[0079] When in use, the stretching roller 21 stretches the backing base film by means of the elastic cooperation between the stretching frame 213 and the spring 214 in the groove 2121. During the stretching process, the backing base film is stretched and there is flexible contact between the backing base film and the stretching frame 213, which can prevent the backing base film from cracking during the stretching process.

[0080] Example 3:

[0081] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0082] The feeding assembly 3 includes:

[0083] Guide rail 31 is provided on the walls on both sides of cavity 11;

[0084] A magnetic drive component 32 is mounted on a guide rail 31 and is connected to a clamping component 34.

[0085] As can be seen from this embodiment, the material guiding assembly 3 includes a guide rail 31, a magnetic drive component 32, and a clamping component 34;

[0086] The guide rails 31 are set on the walls on both sides of the cavity 11 and are arranged alternately along the tension rods to form a meandering structure;

[0087] The magnetic drive unit 32 is connected to the guide rail 31, and the clamping member 34 is connected to the magnetic drive unit 32. When in use, the clamping member 34 is used to connect the back sheet base film, and when the magnetic drive unit 32 moves along the guide rail 31, it drives the clamping member 34 to move, thereby controlling the movement of the back sheet base film.

[0088] Example 4:

[0089] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0090] The magnetic drive element 32 includes:

[0091] Magnetic module 321 is laid on guide rail 31;

[0092] Suspension component 322 is mounted on guide rail 31 and connected to clamping component 34. Suspension component 322 cooperates with magnetic module 321.

[0093] The controller 333 is connected to the magnetic module 321 and controls the change of the positive and negative poles of the magnetic module 321.

[0094] As can be seen from this embodiment, the magnetic drive component 32 includes a magnetic module 321, a suspension component 322, and a controller 333;

[0095] The magnetic module 321 is mounted on the guide rail 31, and the suspension component 322 is connected to the guide rail 31 and magnetically engaged with the magnetic module 321. The controller 333 is used to control the operation of the magnetic module 321, and the magnetic module 321 is connected to the controller 333 through an eddy current sensor. In use, the controller 333 adjusts the change of magnetic poles on the magnetic module 321 to control the movement of the suspension component 322 on the guide rail 31, thereby achieving the purpose of guiding materials.

[0096] Example 5:

[0097] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0098] Magnetic module 321 includes:

[0099] The main body 3211 has a groove provided on it;

[0100] Glue block 3212 is attached to the groove;

[0101] Among them, the main body 3211 is an electromagnet.

[0102] As can be seen from this embodiment, the magnetic module 321 includes a body 3211, a glue block 3212, and a coil;

[0103] The main body 3211 is an electromagnet attached to the guide rail 31. The main body 3211 has grooves formed on it, and the grooves are connected to the adhesive block 3212.

[0104] When in use, the adhesive block 3212 forms multiple protrusions on the guide rail 31, which can restrict the movement of the suspension component 322 when the main body 3211 loses its magnetic force, thereby helping to improve the performance.

[0105] Example 6:

[0106] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0107] Each individual magnetic module 321 is individually controlled by controller 333.

[0108] As can be seen from this embodiment, the magnetic modules 321 and the controller 333 are controlled independently and powered by independent circuits. Therefore, during use, it is convenient to control the motor of the individual magnetic modules 321 to adjust the displacement of the suspension component 322 by suction, thereby achieving the effect of controlling the displacement of the suspension component 322 (suction suspension technology is widely used in levitation trains, which is manifested by using the magnetic field generated by the electromagnet to attract the guide magnet on the track, so that the train is levitated. This form can also generate levitation force when stationary).

[0109] Example 7:

[0110] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0111] The levitation component 322 includes:

[0112] The bracket 3221 has a first branch and a second branch at one end;

[0113] Roller 3223 is provided on both the first and second branches;

[0114] Magnetic block 3224 is disposed between the first branch and the second branch, and magnetically engages with magnetic module 321.

[0115] Among them, the outer side of the roller 3223 is provided with a rubber sleeve, and the rubber sleeve is provided with tooth-shaped protrusions.

[0116] As can be seen from this embodiment, the suspension component 322 includes a bracket 3221, a roller 3223, and a magnetic block 3224;

[0117] The bracket 3221 has a first branch and a second branch formed at one end, and the first branch 32211 and the second branch 32222 are hinged and fixed together. The roller 3223 is connected to both the first branch and the second branch. The magnetic block 3224 is set between the first branch and the second branch, and when in use, it is driven by the attraction of the magnetic module 321 at the front or rear end to move the roller 3223 along the guide rail 31.

[0118] Example 8:

[0119] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0120] Clamping member 34 includes:

[0121] Connecting plate 341, both ends of connecting plate 341 are connected to the second branch;

[0122] Clamping plate 342 is mounted on connecting plate 341 and is bolted to connecting plate 341.

[0123] As can be seen from this embodiment, the clamping member 34 includes a main body, a connecting plate 341, and a clamping plate 342;

[0124] The connecting plate 341 is bolted together with the bracket 3221 and bolted together with the clamping plate 342;

[0125] In use, by adjusting the tightness of the bolts between the clamping plate 342 and the connecting plate 341, a clamping gap is formed between the clamping plate 342 and the connecting plate 341. The clamping gap is controlled by the bolts to tighten or loosen the clamping plate 342 and the connecting plate 341 to clamp the backing base film.

[0126] Example 9:

[0127] This embodiment provides a backsheet base film stretching device, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0128] Limiting protrusions 5 are provided on the guide rail 31, and the body 3211 is provided between the limiting protrusions 5.

[0129] As can be seen from this embodiment, by setting the limiting protrusion 5 on the guide rail 31 to limit and fix the body 3211, it is helpful to install the magnetic module 321 and at the same time, it is easy to control the magnetic range of the magnetic module 321.

[0130] Example 10:

[0131] This embodiment provides a white backsheet base film, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0132] A white backing film, after being stretched, exhibits stable light transmittance on both its composite and coated surfaces.

[0133] As can be seen from this embodiment, a white backing film with one-sided coating and one-sided composite is formed by directly coating a fluorocarbon coating with fluororesin as the main component onto the surface of a PET substrate on one side, and bonding the other side to a fluorinated backing. Since the coating process is at a high temperature, the coating process is usually used to attach the fluorinated coating to the intermediate layer, and then the outer layer is bonded to the intermediate layer with glue.

[0134] 2. Selection of white coating formulation for the coating surface: Select a suitable fluororesin and silicon dioxide or titanium dioxide powder, and grind them into a white resin using a three-roll mill. Then add anti-UV oxidant, UV absorber and anti-hydrolysis additives to obtain a white backing coating formulation.

[0135] 3. The raw materials for fluoropolymer coatings include the following components in the indicated mass ratios: 30-55% fluoropolymer coating; 20-40% solvent; 2-6% crosslinking agent and curing agent; and 15-40% filler.

[0136] 4. Then, it is laminated with a transparent backing sheet containing fluorine. The only fluorine-containing films are DuPont's PVF film and PVDF film.

[0137] 5. Reflectivity (400-1100nm) ≥ 75%;

[0138] 6. Tensile strength: TD≥120MPa; MD≥120MPa; Elongation at break: TD≥100%, MD≥120%;

[0139] 7. The water vapor transmission rate (38℃×90%RH) of this type of back panel is ≤2.0g / (m2·day);

[0140] 8.2000H Yellowing Δb≤2.0;

[0141] 9. Damp heat aging test (DH2000H): No delamination or bubbling; surface and adhesive layer are not sticky; elongation at break retention rate ≥80%; yellowing Δb ≤2.0.

[0142] After production, the base film is stretched to extend its extensibility, so that during subsequent use, it will not be stretched due to external factors and thus affect the light transmittance, thereby enhancing the effect of the base film.

[0143] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A backsheet base film stretching device, characterized in that, include: Box (1), wherein a cavity (11) is provided inside the box (1); A tensioning assembly (2) is disposed within a cavity (11); The material guiding assembly (3) is disposed on both sides of the cavity (11) and guides the back plate base film through the stretching assembly (2). Temperature control device (4), wherein the temperature control device (4) is disposed in cavity (11); The upper side of the box (1) is equipped with a vacuum pump; The stretching component (2) includes: Stretch roller (21); Feeding roller (22); Take-up roller (23); The feeding roller (22) and receiving roller (23) are located at both ends of the cavity (11) and are connected to motors. Multiple stretching rollers (21) are arranged between the feeding roller (22) and receiving roller (23). The guiding component (3) guides the back plate base film to pass through multiple stretching rollers (21) in an alternating manner. The stretching roller (21) includes: A rotating shaft (211) is provided, with turntables connected to both ends of the rotating shaft (211), and the turntables are fixed to the wall of the cavity (11); Fixed disk (212), two fixed disks (212) are symmetrically arranged on the rotating shaft (211), and the fixed disks (212) are provided with a plurality of slots (2121) arranged in a circumferential array, and the slots (2121) are provided with columns (2122). A tension frame (213) is connected to a slot (2121) and to a column (2122), and a spring (214) is provided on the column (2122) inside the tension frame (213). The feeding assembly (3) includes: The guide rail (31) is set on the walls on both sides of the cavity (11) and is staggered along the stretching roller (21) to form a meandering structure; A magnetic drive (32) is disposed on a guide rail (31) and connected to a clamping member (34).

2. The backsheet base film stretching device according to claim 1, characterized in that, The magnetic drive (32) includes: Magnetic module (321), said magnetic module (321) is laid on guide rail (31); The suspension component (322) is mounted on the guide rail (31) and connected to the clamping member (34). The suspension component (322) cooperates with the magnetic module (321). The controller (333) is connected to the magnetic module (321) and controls the change of the positive and negative poles of the magnetic module (321).

3. The backsheet base film stretching device according to claim 2, characterized in that, The magnetic module (321) includes: The body (3211) has a groove provided on it; Adhesive block (3212), said adhesive block (3212) is connected to the groove; The main body (3211) is an electromagnet.

4. The backsheet base film stretching device according to claim 3, characterized in that, Each of the individual magnetic modules (321) is individually controlled by a controller (333).

5. The backsheet base film stretching device according to claim 4, characterized in that, The levitation component (322) includes: The bracket (3221) has a first branch (32211) and a second branch (32222) at one end. Roller (3223), wherein the roller (3223) is provided on both the first branch (32211) and the second branch (32222); A magnetic block (3224) is disposed between the first branch (32211) and the second branch (32222) and magnetically engages with the magnetic module (321). The roller (3223) is provided with a rubber sleeve on its outer side, and the rubber sleeve is provided with tooth-shaped protrusions.

6. The backsheet base film stretching device according to claim 5, characterized in that, The clamping element (34) includes: A connecting plate (341) is connected at both ends to a second branch (32222); The clamping plate (342) is mounted on the connecting plate (341) and is bolted to the connecting plate (341).

7. The backsheet base film stretching device according to claim 6, characterized in that, it further... include: The limiting protrusion (5) is disposed on the guide rail (31), and the body (3211) is disposed between the limiting protrusions (5).

8. A white backsheet base film produced by a backsheet base film stretching device according to any one of claims 1-7, characterized in that, A white backing film with one side coated and the other side laminated has stable light transmittance on both the laminated and coated sides after stretching.

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