CN109291475B - Preparation method of insulating strip for solar module - Google Patents
Preparation method of insulating strip for solar module Download PDFInfo
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- CN109291475B CN109291475B CN201811438326.7A CN201811438326A CN109291475B CN 109291475 B CN109291475 B CN 109291475B CN 201811438326 A CN201811438326 A CN 201811438326A CN 109291475 B CN109291475 B CN 109291475B
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Abstract
The invention belongs to the technical field of packaging materials, and discloses a preparation method of an insulating strip for solar energy. The method specifically comprises the following steps: unreeling the milky PET Mylar film, carrying out corona treatment on the inner side of the milky PET Mylar film, compounding an EVA casting film, carrying out corona treatment, and reeling after static elimination to obtain a compound B; and then unreeling again, and carrying out corona treatment and EVA casting film compounding treatment on the outer side of the compound B to obtain a compound C, then carrying out corona treatment, and reeling after static elimination to obtain the insulating strip for the solar module. According to the invention, the inner side of the base material is subjected to corona treatment, so that polar carbonyl groups can be formed on the surface of the base material, and the EVA casting film can also form polar groups under the strong oxidizing property of ozone; under the condition of no AC agent, the bonding force between the two can be ensured; and has good insulating property, and can effectively isolate the multilayer circuit.
Description
Technical Field
The invention belongs to the technical field of packaging materials, and particularly relates to a preparation method of an insulating strip for a solar module.
Background
In solar module, use the backplate insulated strip to completely cut off the positive negative pole of busbar usually, but use the insulated strip completely cut off to be, the air side of backplate insulated strip can't produce fine bonding effect with EVA, so the local region of subassembly can have the risk that glass drops, and is more serious, can influence the stability of subassembly. In addition, the insulating strips can be subjected to continuous ultraviolet irradiation of sunlight, and in long-term practical use, along with the continuous slow penetration of water vapor and the residual of the primer in the processing process, the insulating strips can slowly lose effectiveness and change under the action of the ultraviolet irradiation and the water vapor, so that the ultraviolet resistance and the water resistance of the insulating strips are also important.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the preparation method of the insulating strip for the solar module, and the prepared insulating strip has a simple structure and good performance.
The present invention achieves the above-described object by the following technical means.
A preparation method of an insulating strip for a solar module comprises the following steps:
the first procedure is as follows:
(1) unreeling a base material: releasing the milky PET Mylar film through unwinding equipment;
(2) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(3) carrying out corona treatment on the inner side of the milky white PET Mylar film released in the step 1 by using corona sparks in the step 2 to enable the corona value of the treated surface to reach 52 dynes;
(4) melting and casting ethylene copolymer EVA resin particles through an extruder to form a transparent casting film;
(5) and (3) enabling the milky white PET Mylar film subjected to corona treatment in the step (3) and the EVA casting film in the step (4) to pass through a compounding device together, combining the EVA casting film with the corona-treated side of the milky white PET Mylar film at the moment, measuring the EVA casting film internally, and enabling the milky white PET Mylar film to be on the outer side to obtain a compound A. The specific way of the composite treatment is as follows: firstly, placing EVA resin particles in an extruder, heating the extruder, adjusting the rotating speed, the extrusion amount and the air gap height of the extruder, melting and pressurizing the EVA resin particles, and forming an EVA film through a die lip of the extruder to form an EVA film cast film; then the film and the milky white PET Mylar film subjected to corona treatment in the step (3) pass through a pressed roller and a cooling roller of a compounding device together, ozone is introduced between the EVA casting film and the milky white PET Mylar film in the compounding process, and the direction of the introduced ozone forms a certain angle with the EVA casting film; then cooling by a cooling roller, and finally passing through a stripping roller; the pressing point of the pressed roll and the cooling roll is a, the pressing point of the cooling roll and the stripping roll is b, and the EVA casting film and the milky PET Mylar film are compounded and then reach the pressing point b through the pressing point a;
the VA content of the EVA resin is between 15 and 20 percent, and the MI is between 7 and 8g/10 min;
the temperature of the EVA resin is controlled at 210-220 ℃;
the rotating speed of a screw of the extruder is 460-470 r/min; the extrusion amount is 280-300 kg/h;
the "air gap height", i.e. the vertical distance from the die lip of the extruder to the compounding position, is 10cm-15 cm; the die lip opening of the extruder deviates 5-10 degrees towards the side of the pressed roll by taking the tangential line position of the pressed roll and the cooling roll as a reference.
The flow rate of the ozone is controlled to be 60L/h;
the ozone introducing direction and the EVA film form an included angle of 40-50 degrees;
the ozone introduction mode is as follows: a row of round holes are uniformly formed in the stainless steel vent pipe, the diameter of the vent pipe is 1.5cm, the diameter of each round hole is 1mm, and the distance between the round holes is 3-5 mm. The vertical distance between the wall of the vent pipe and the surface of the milky PET Mylar film is 6-9 mm;
and after the EVA casting film and the milky PET Mylar film are compounded, when the EVA casting film and the milky PET Mylar film reach a pressing point b through a pressing point a, the distance between the pressing point a and the pressing point b is controlled to be 1500-1600 mm. The temperature of the cooling roller is controlled to be 18-20 ℃, and the cooling time is controlled to be 0.5-0.8 second;
(6) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(7) performing corona treatment on the inner side of the compound A obtained in the step 5, namely the side of the EVA casting film by using corona sparks in the step 6 to enable the corona value of the treated surface to reach 36 dynes;
(8) after the static electricity is eliminated, winding by using a winding device to obtain a compound B;
the second procedure:
(9) releasing the compound B in the step 8 by using an unwinding device,
(10) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(11) carrying out corona treatment on the outer side of the compound B released in the step 9 by using corona sparks in the step 10 to enable the corona value of the treated surface to reach 52 dynes;
(12) melting and casting ethylene copolymer particles through an extruder to form a transparent film;
(13) the compound B subjected to corona treatment in the step 11 and the ethylene copolymer film in the step 12 pass through a compounding device together, and the ethylene copolymer film in the step 12 is combined with the outer side of the compound B, namely the milky PET Mylar film, to obtain a compound C; the compound treatment mode is the same as the step (5);
(14) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(15) performing corona treatment on the inner side of the compound C, namely the ethylene copolymer film in the step 12 by using corona sparks in the step 14 to enable the surface of the treated surface to reach 36 dynes;
(16) and after the static electricity is eliminated, winding by using a winding device to obtain the insulating strip for the solar module.
The insulating strip for the solar module, which is prepared by the invention, sequentially comprises the EVA casting film, the milky-white PET Mylar film and the EVA casting film, has good insulating property, and can effectively isolate a multilayer circuit.
The invention has the beneficial effects that:
(1) according to the invention, the inner side of the base material is subjected to corona treatment, so that polar carbonyl groups can be formed on the surface of the base material, and the EVA casting film can also form polar groups under the strong oxidizing property of ozone; under the condition of no AC agent, the bonding force between the two can be ensured;
(2) the milky white PET Mylar film is subjected to high-grade corona treatment, so that the adhesive force between the EVA and the milky white PET Mylar film is ensured; the surface of the EVA casting film is subjected to low-grade corona treatment, so that adhesion can be prevented;
(3) the milky PET Mylar film has stable and straight size, excellent tear strength, heat and cold resistance, moisture and water resistance, chemical corrosion resistance, super-strong insulating property and excellent electrical, mechanical, heat and chemical resistance;
(4) the milky white PET Mylar film has insulating property, and the EVA casting film and the like coated on the surface of the milky white PET Mylar film can further isolate air and water vapor in the air; meanwhile, the circuit can be fixed, and the circuit is prevented from loosening;
(5) the VA content of the EVA resin is controlled to be 15-20%, so that the high crystallinity can be effectively reduced, and the flexibility, the impact resistance, the filler intermiscibility and the heat sealing performance are improved.
Drawings
Fig. 1 is a flow chart of the present invention, wherein a is a first process flow chart, and b is a second process flow chart.
FIG. 2 is a detailed schematic of the composite process.
Fig. 3 is a partially enlarged view of a portion a in fig. 2.
Fig. 4 is a partially enlarged view of fig. 2 at B.
Fig. 5 is a schematic structural view of an insulating strip for a solar module according to the present invention.
The reference numerals are explained below:
1-extruder, 2-cooling roller, 3-pressed roller, 4-stripping roller and 5-vent pipe.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Example 1
The first procedure is as follows:
(1) unreeling a base material: releasing the milky PET Mylar film through unwinding equipment;
(2) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(3) carrying out corona treatment on the inner side of the milky white PET Mylar film released in the step 1 by using corona sparks in the step 2 to enable the corona value of the treated surface to reach 52 dynes;
(4) melting and casting ethylene copolymer EVA resin particles through an extruder to form a transparent casting film;
(5) and (3) enabling the milky white PET Mylar film subjected to corona treatment in the step (3) and the EVA casting film in the step (4) to pass through a compounding device together, combining the EVA casting film with the corona-treated side of the milky white PET Mylar film at the moment, measuring the EVA casting film internally, and enabling the milky white PET Mylar film to be on the outer side to obtain a compound A. The specific way of the composite treatment is as follows: firstly, placing EVA resin particles in an extruder, heating the extruder, adjusting the rotating speed, the extrusion amount and the air gap height of the extruder, melting and pressurizing the EVA resin particles, and forming an EVA film through a die lip of the extruder to form an EVA film cast film; then the film and the milky white PET Mylar film subjected to corona treatment in the step (3) pass through a pressed roller and a cooling roller of a compounding device together, ozone is introduced between the EVA casting film and the milky white PET Mylar film in the compounding process, and the direction of the introduced ozone forms a certain angle with the EVA casting film; then cooling by a cooling roller, and finally passing through a stripping roller; the pressing point of the pressed roll and the cooling roll is a, the pressing point of the cooling roll and the stripping roll is b, and the EVA casting film and the milky PET Mylar film are compounded and then reach the pressing point b through the pressing point a;
the VA content of the EVA resin is between 15 percent, and the MI is between 7g/10 min;
the temperature of the EVA resin is controlled at 210 ℃;
the screw rotating speed of the extruder is 460 r/min; the extrusion capacity was 280 kg/h;
the "air gap height", i.e. the vertical distance from the die lip of the extruder to the compounding position, was 10 cmcm; the die lip opening of the extruder was deviated by 5 degrees toward the roll-receiving side with reference to the tangential position of the roll-receiving and cooling rolls.
The flow rate of the ozone is controlled to be 60L/h;
the ozone introducing direction and the EVA film form an included angle of 40 degrees;
the ozone introduction mode is as follows: a row of round holes are uniformly formed in the stainless steel vent pipe, the diameter of the vent pipe is 1.5cm, the diameter of each round hole is 1mm, and the distance between the round holes is 3 mm. The vertical distance between the wall of the vent pipe and the surface of the milky PET Mylar film is 6 mm;
and when the EVA casting film and the milky PET Mylar film reach a pressing point b through a pressing point a after being compounded, the distance between the pressing point a and the pressing point b is controlled at 1500 mm. The temperature of the cooling roller is controlled at 18 ℃, and the cooling time is controlled at 0.5 second;
(6) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(7) performing corona treatment on the inner side of the compound A obtained in the step 5, namely the side of the EVA casting film by using corona sparks in the step 6 to enable the corona value of the treated surface to reach 36 dynes;
(8) after the static electricity is eliminated, winding by using a winding device to obtain a compound B;
the second procedure:
(9) releasing the compound B in the step 8 by using an unwinding device,
(10) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(11) carrying out corona treatment on the outer side of the compound B released in the step 9 by using corona sparks in the step 10 to enable the corona value of the treated surface to reach 52 dynes;
(12) melting and casting ethylene copolymer particles through an extruder to form a transparent film;
(13) the compound B subjected to corona treatment in the step 11 and the ethylene copolymer film in the step 12 pass through a compounding device together, and the ethylene copolymer film in the step 12 is combined with the outer side of the compound B, namely the milky PET Mylar film, to obtain a compound C; the compound treatment mode is the same as the step (5);
(14) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(15) performing corona treatment on the inner side of the compound C, namely the ethylene copolymer film in the step 12 by using corona sparks in the step 14 to enable the surface of the treated surface to reach 36 dynes;
(16) and after the static electricity is eliminated, winding by using a winding device to obtain the insulating strip for the solar module.
The insulating strip for the solar module, which is prepared by the invention, sequentially comprises an EVA casting film, a milky-white PET Mylar film and an EVA casting film. Good insulating property, and can effectively isolate multilayer circuit.
Example 2
The first procedure is as follows:
(1) unreeling a base material: releasing the milky PET Mylar film through unwinding equipment;
(2) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(3) carrying out corona treatment on the inner side of the milky white PET Mylar film released in the step 1 by using corona sparks in the step 2 to enable the corona value of the treated surface to reach 52 dynes;
(4) melting and casting ethylene copolymer EVA resin particles through an extruder to form a transparent casting film;
(5) and (3) enabling the milky white PET Mylar film subjected to corona treatment in the step (3) and the EVA casting film in the step (4) to pass through a compounding device together, combining the EVA casting film with the corona-treated side of the milky white PET Mylar film at the moment, measuring the EVA casting film internally, and enabling the milky white PET Mylar film to be on the outer side to obtain a compound A. The specific way of the composite treatment is as follows: firstly, placing EVA resin particles in an extruder, heating the extruder, adjusting the rotating speed, the extrusion amount and the air gap height of the extruder, melting and pressurizing the EVA resin particles, and forming an EVA film through a die lip of the extruder to form an EVA film cast film; then the film and the milky white PET Mylar film subjected to corona treatment in the step (3) pass through a pressed roller and a cooling roller of a compounding device together, ozone is introduced between the EVA casting film and the milky white PET Mylar film in the compounding process, and the direction of the introduced ozone forms a certain angle with the EVA casting film; then cooling by a cooling roller, and finally passing through a stripping roller; the pressing point of the pressed roll and the cooling roll is a, the pressing point of the cooling roll and the stripping roll is b, and the EVA casting film and the milky PET Mylar film are compounded and then reach the pressing point b through the pressing point a;
the VA content of the EVA resin is between 18 percent, and the MI is between 7.5g/10 min;
the temperature of the EVA resin is controlled at 215 ℃;
the screw rotating speed of the extruder is 465 revolutions per minute; the extrusion capacity is 290 kg/h;
the "air gap height", i.e. the vertical distance from the die lip of the extruder to the compounding position, was 12.5 cm; the die lip opening of the extruder was deviated by 8 degrees toward the roll-receiving side with reference to the tangential position of the roll-receiving and cooling rolls.
The flow rate of the ozone is controlled to be 60L/h;
the ozone introducing direction and the EVA film form an included angle of 45 degrees;
the ozone introduction mode is as follows: a row of round holes are uniformly formed in the stainless steel vent pipe, the diameter of the vent pipe is 1.5cm, the diameter of each round hole is 1mm, and the distance between the round holes is 4 mm. The vertical distance between the wall of the vent pipe and the surface of the milky PET Mylar film is 7.5 mm;
and after the EVA casting film and the milky PET Mylar film are compounded, the distance between the pressing point a and the pressing point b is controlled at 1550mm when the EVA casting film and the milky PET Mylar film reach the pressing point b through the pressing point a. The temperature of the cooling roller is controlled at 19 ℃, and the cooling time is controlled at 0.6 second;
(6) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(7) performing corona treatment on the inner side of the compound A obtained in the step 5, namely the side of the EVA casting film by using corona sparks in the step 6 to enable the corona value of the treated surface to reach 36 dynes;
(8) after the static electricity is eliminated, winding by using a winding device to obtain a compound B;
the second procedure:
(9) releasing the compound B in the step 8 by using an unwinding device,
(10) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(11) carrying out corona treatment on the outer side of the compound B released in the step 9 by using corona sparks in the step 10 to enable the corona value of the treated surface to reach 52 dynes;
(12) melting and casting ethylene copolymer particles through an extruder to form a transparent film;
(13) the compound B subjected to corona treatment in the step 11 and the ethylene copolymer film in the step 12 pass through a compounding device together, and the ethylene copolymer film in the step 12 is combined with the outer side of the compound B, namely the milky PET Mylar film, to obtain a compound C; the compound treatment mode is the same as the step (5);
(14) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(15) performing corona treatment on the inner side of the compound C, namely the ethylene copolymer film in the step 12 by using corona sparks in the step 14 to enable the surface of the treated surface to reach 36 dynes;
(16) and after the static electricity is eliminated, winding by using a winding device to obtain the insulating strip for the solar module.
The insulating strip for the solar module, which is prepared by the invention, sequentially comprises an EVA casting film, a milky-white PET Mylar film and an EVA casting film. Good insulating property, and can effectively isolate multilayer circuit.
Example 3
The first procedure is as follows:
(1) unreeling a base material: releasing the milky PET Mylar film through unwinding equipment;
(2) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(3) carrying out corona treatment on the inner side of the milky white PET Mylar film released in the step 1 by using corona sparks in the step 2 to enable the corona value of the treated surface to reach 52 dynes;
(4) melting and casting ethylene copolymer EVA resin particles through an extruder to form a transparent casting film;
(5) and (3) enabling the milky white PET Mylar film subjected to corona treatment in the step (3) and the EVA casting film in the step (4) to pass through a compounding device together, combining the EVA casting film with the corona-treated side of the milky white PET Mylar film at the moment, measuring the EVA casting film internally, and enabling the milky white PET Mylar film to be on the outer side to obtain a compound A. The specific way of the composite treatment is as follows: firstly, placing EVA resin particles in an extruder, heating the extruder, adjusting the rotating speed, the extrusion amount and the air gap height of the extruder, melting and pressurizing the EVA resin particles, and forming an EVA film through a die lip of the extruder to form an EVA film cast film; then the film and the milky white PET Mylar film subjected to corona treatment in the step (3) pass through a pressed roller and a cooling roller of a compounding device together, ozone is introduced between the EVA casting film and the milky white PET Mylar film in the compounding process, and the direction of the introduced ozone forms a certain angle with the EVA casting film; then cooling by a cooling roller, and finally passing through a stripping roller; the pressing point of the pressed roll and the cooling roll is a, the pressing point of the cooling roll and the stripping roll is b, and the EVA casting film and the milky PET Mylar film are compounded and then reach the pressing point b through the pressing point a;
the VA content of the EVA resin is between 20 percent, and the MI is between 8g/10 min;
the temperature of the EVA resin is controlled at 220 ℃;
the screw rotating speed of the extruder is 470 r/min; the extrusion amount is 300 kg/h;
the "air gap height", i.e. the vertical distance from the die lip of the extruder to the compounding position, was 15 cm; the die lip opening of the extruder was deviated 10 degrees to the roll-receiving side with reference to the tangential position of the roll-receiving and cooling rolls.
The flow rate of the ozone is controlled to be 60L/h;
the ozone introducing direction and the EVA film form an included angle of 50 degrees;
the ozone introduction mode is as follows: a row of round holes are uniformly formed in the stainless steel vent pipe, the diameter of the vent pipe is 1.5cm, the diameter of each round hole is 1mm, and the distance between the round holes is 5 mm. The vertical distance between the wall of the vent pipe and the surface of the milky white PET Mylar film is 9 mm;
and after the EVA casting film and the milky PET Mylar film are compounded, the distance between the pressing point a and the pressing point b is controlled to be 1600mm when the EVA casting film and the milky PET Mylar film reach the pressing point b through the pressing point a. The temperature of the cooling roller is controlled to be 20 ℃, and the cooling time is controlled to be 0.8 second;
(6) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(7) performing corona treatment on the inner side of the compound A obtained in the step 5, namely the side of the EVA casting film by using corona sparks in the step 6 to enable the corona value of the treated surface to reach 36 dynes;
(8) after the static electricity is eliminated, winding by using a winding device to obtain a compound B;
the second procedure:
(9) releasing the compound B in the step 8 by using an unwinding device,
(10) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(11) carrying out corona treatment on the outer side of the compound B released in the step 9 by using corona sparks in the step 10 to enable the corona value of the treated surface to reach 52 dynes;
(12) melting and casting ethylene copolymer particles through an extruder to form a transparent film;
(13) the compound B subjected to corona treatment in the step 11 and the ethylene copolymer film in the step 12 pass through a compounding device together, and the ethylene copolymer film in the step 12 is combined with the outer side of the compound B, namely the milky PET Mylar film, to obtain a compound C; the compound treatment mode is the same as the step (5);
(14) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(15) performing corona treatment on the inner side of the compound C, namely the ethylene copolymer film in the step 12 by using corona sparks in the step 14 to enable the surface of the treated surface to reach 36 dynes;
(16) and after the static electricity is eliminated, winding by using a winding device to obtain the insulating strip for the solar module.
The insulating strip for the solar module, which is prepared by the invention, sequentially comprises an EVA casting film, a milky-white PET Mylar film and an EVA casting film. Good insulating property, and can effectively isolate multilayer circuit.
Performance data
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.
Claims (2)
1. A preparation method of an insulating strip for a solar module is characterized by comprising the following steps:
the first procedure is as follows:
(1) unreeling a base material: releasing the milky PET Mylar film through unwinding equipment;
(2) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(3) carrying out corona treatment on the inner side of the milky PET Mylar film released in the step 1 by using corona sparks in the step 2;
(4) melting and casting ethylene copolymer EVA resin particles through an extruder to form a transparent casting film;
(5) enabling the milky white PET Mylar film subjected to corona treatment in the step 3 and the EVA casting film in the step 4 to pass through a compounding device together, combining the EVA casting film with the corona-treated side of the milky white PET Mylar film at the moment, measuring the EVA casting film at the inner side, and enabling the milky white PET Mylar film to be at the outer side to obtain a compound A;
the specific way of the composite treatment is as follows: firstly, placing EVA resin particles in an extruder, heating the extruder, adjusting the rotating speed, the extrusion amount and the air gap height of the extruder, melting and pressurizing the EVA resin particles, and forming an EVA film through a die lip of the extruder to form an EVA film cast film; then the film and the milky white PET Mylar film subjected to corona treatment in the step (3) pass through a pressed roller and a cooling roller of a compounding device together, ozone is introduced between the EVA casting film and the milky white PET Mylar film in the compounding process, and the direction of the introduced ozone forms a certain angle with the EVA casting film; then cooling by a cooling roller, and finally passing through a stripping roller; the pressing point of the pressed roll and the cooling roll is a, the pressing point of the cooling roll and the stripping roll is b, and the EVA casting film and the milky PET Mylar film are compounded and then reach the pressing point b through the pressing point a;
the VA content of the EVA resin is between 15 and 20 percent, and the MI is between 7 and 8g/10 min; the temperature of the EVA resin is controlled at 210-220 ℃;
the rotating speed of a screw of the extruder is 460-470 r/min; the extrusion amount is 280-300 kg/h;
the "air gap height", i.e. the vertical distance from the die lip of the extruder to the compounding position, is 10cm-15 cm; taking the tangential line positions of the pressed roller and the cooling roller as a reference, and deviating 5-10 degrees from the die lip opening of the extruder to one side of the pressed roller;
the flow rate of the ozone is controlled to be 60L/h; the ozone introducing direction and the EVA film form an included angle of 40-50 degrees;
the ozone introduction mode is as follows: a row of round holes are uniformly formed on the stainless steel vent pipe, the diameter of the vent pipe is 1.5cm, the diameter of the round holes is 1mm, and the distance between the round holes is 3-5 mm; the vertical distance between the wall of the vent pipe and the surface of the milky white PET Mylar film is 6-9 mm.
When the EVA casting film and the milky PET Mylar film are compounded and then reach a pressing point b through a pressing point a, the distance between the pressing point a and the pressing point b is controlled to be 1500-1600 mm; the temperature of the cooling roller is controlled to be 18-20 ℃, and the cooling time is controlled to be 0.5-0.8 second;
(6) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(7) performing corona treatment on the inner side of the compound A obtained in the step 5, namely the side of the EVA casting film by using corona sparks in the step 6;
(8) after the static electricity is eliminated, winding by using a winding device to obtain a compound B;
the second procedure:
(9) releasing the compound B in the step 8 by using an unwinding device,
(10) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(11) corona treating the outside of the composite B released in step 9 with the corona spark of step 10;
(12) melting and casting ethylene copolymer particles through an extruder to form a transparent film;
(13) the compound B subjected to corona treatment in the step 11 and the ethylene copolymer film in the step 12 pass through a compounding device together, and the ethylene copolymer film in the step 12 is combined with the outer side of the compound B, namely the milky PET Mylar film, to obtain a compound C; the compound treatment mode is the same as the step (5);
(14) applying high-frequency and high-voltage electricity to corona treatment equipment to discharge to generate corona sparks;
(15) the inside of compound C, i.e., the ethylene copolymer film in step 12, was corona treated using a corona spark in step 14;
(16) and after the static electricity is eliminated, winding by using a winding device to obtain the insulating strip for the solar module.
2. The method of claim 1, wherein the step of forming the insulating strip for solar modules,
performing corona treatment in the step (3) to enable the surface corona value of the treated surface to reach 52 dynes;
performing corona treatment in the step (7) to enable the surface corona value of the treated surface to reach 36 dynes;
performing corona treatment in the step (11) to enable the surface corona value of the treated surface to reach 52 dynes;
and (5) performing corona treatment in the step (15) to enable the surface corona value of the treated surface to reach 36 dynes.
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