CN114950871A - Non-contact hot melt adhesive film laminating system and film laminating method thereof - Google Patents

Abstract

The invention discloses a non-contact hot melt adhesive film covering system and a film covering method thereof. The non-contact hot melt adhesive film covering system and the film covering method thereof provided by the invention form a film by pulling the hot melt adhesive under negative pressure, realize the film covering of the hot melt adhesive on the substrate by adopting the non-contact mode, and are convenient to form a film covering layer with uniform thickness because the thickness of the film covering can be adjusted by the operating speed of the coating roller and the vacuum degree of negative pressure air. In addition, exhaust tail gas is cooled by the tail gas cooling device, so that the generation of high-temperature tail gas is reduced, the pollution to the environment is reduced, and the environment protection is facilitated. The non-contact hot melt adhesive film laminating system can be widely applied to the fields of photovoltaic back plate coating, new materials, lithium batteries, label electronic tapes and the like.

Description

A non-contact hot melt adhesive lamination system and lamination method thereof

technical field

The invention relates to the technical field of hot-melt adhesive film coating, in particular to a non-contact hot-melt adhesive film coating system and a film coating method thereof.

Background technique

At present, the protective film of the solar back sheet can usually be treated by glue coating. For example, the Chinese patent application with the application number of 2009101812509 discloses a coating method for the adhesive of the solar cell panel. The adhesive is delivered to the coating cavity, and the adhesive is directly coated on the surface of the substrate through the outlet of the coating cavity, and then passes through the drying box to dry the adhesive, so that the adhesive and the substrate are firmly bonded . However, this coating method only relies on the coating cavity to output the adhesive to the substrate. Even if a programmable controller is used to control the flow rate and the running speed of the substrate, it is not easy to make the adhesive on the substrate evenly coated. , and this coating structure is not suitable for the production process of hot melt adhesive coating process.

In addition, in the Chinese patent application with the application number of 2012102761991, there is disclosed a solar back sheet protective film coating equipment, including an introduction pressure roll, an introduction roll, a guide roll, a coating roll and a coating lining roll, and the lower end of the coating roll is A glue transfer roller is provided, and the lower end of the glue transfer roller is arranged in the glue tank. The glue in the glue tank is brought up by the glue transfer roller and applied to the surface of the coating roller. In this coating method, although it is quantitatively coated by setting a metering roller, and the uniformity of glue coating is improved by setting a vibration generator, in this structure, it is also necessary to set The scraper scrapes off the glue remaining on the coating roller. Therefore, the scraper needs to be cleaned regularly, and the coating roller is easy to wear and its service life is affected. In addition, this structure is not suitable for the coating of hot melt adhesive. .

In addition, in the prior art, some non-contact coating methods are also disclosed. For example, the Chinese patent application with the application number of 2013102490195 discloses a non-contact high-precision coating machine, which includes a feeding device, a turning roller The turning roller device includes a first turning roller and a second turning roller, at least part of the bottom of the feeding device is in the shape of an inner cylindrical surface, the feeding device is installed above the first turning roller, and the The inner cylindrical surface and the cylindrical roller surface of the first turning roller form a cylindrical film pulling cavity, a charging chute is arranged on the upper part of the feeding device, and the bottom of the charging chute is spaced along the width direction of the strip with flow-through holes and The cylindrical pull-membrane cavity is communicated. By setting the cylindrical surface drawing cavity to contact the strip steel with different speeds, on the one hand, the high-precision coating of different thicknesses is formed by controlling the speed of the die; on the other hand, it avoids the contact between the equipment during the coating process. The additional force and deformation have adverse effects on the equipment. However, this coating structure is also not suitable for the coating production process of hot melt adhesive, because the coating outlet is located inside the feeding device, which makes the cleaning of the outlet inconvenient. There is no glue residue, otherwise it will cause the glue to solidify and block the outlet due to downtime.

Therefore, in view of the problems in the prior art, it is necessary to propose a non-contact system suitable for hot-melt adhesive lamination and a method for laminating a solar backplane.

SUMMARY OF THE INVENTION

In order to overcome at least one of the above-mentioned defects in the prior art, the first object of the present invention is to provide a non-contact hot-melt adhesive film coating system to solve the problem of film uniformity in the prior art.

The second object of the present invention is to provide a non-contact hot-melt adhesive film coating method to solve the problem of film uniformity in the prior art.

The technical scheme that the present invention adopts to solve its problem is:

According to one aspect of the embodiments of the present invention, the present invention provides a non-contact hot-melt adhesive laminating system, comprising: a hot-melt adhesive feeding device for heating and supplying the hot-melt adhesive to the outside; a metering pump, connected with the hot-melt adhesive The outlet end of the glue feeding device is connected to pump out the hot melt glue in molten state; the frame; the coating head arranged on the frame is connected with the metering pump through the feeding pipe; it is rotatably arranged on the frame The coating roller, the coating outlet of the coating head is set towards the coating roller, and the coating head and the substrate on the coating roller keep a coating gap; the coating driving motor, which is drivingly connected with the coating roller, is used for Drive the coating roller to rotate; the negative pressure generating cover installed on the frame is attached to the surface of the coating head and the coating roller to form a semi-closed negative pressure cavity, and the negative pressure cavity is communicated with the coating gap; the vacuum pump, through the negative pressure The pressure pipeline is connected with the negative pressure generating hood, and is used to suck the air in the negative pressure generating hood to provide negative pressure for the negative pressure chamber; the exhaust gas cooling device is connected with the negative pressure pipeline and/or the vacuum pump, and is used for cooling the negative pressure The air discharged from the pipeline and the vacuum pump; and the controller, which are electrically connected with the hot melt adhesive feeding device, the metering pump, the coating drive motor, the vacuum pump and the exhaust gas cooling device, and are used to control the hot melt adhesive feeding device, the metering pump, The coating drive motor, vacuum pump and exhaust gas cooling device operate.

According to an aspect of the embodiments of the present invention, the present invention provides a non-contact hot-melt adhesive coating method, using the above-mentioned non-contact hot-melt adhesive coating system, comprising: Step S1: the hot-melt adhesive feeding device The melted material is heated to a molten state;

Step S2: the metering pump pumps out the hot melt adhesive in the molten state with a hot melt adhesive feeding device and transports it to the coating head;

Step S3: the vacuum pump works to provide negative pressure air to the negative pressure chamber of the negative pressure generating cover. Provide a negative pressure pulling force towards the negative pressure cavity, and then form a film;

Step S4: the coating roller rotates to drive the substrate to pass through the coating gap, the film formed in step S3 adheres to the substrate, and continuously coats the substrate with the rotation of the coating roller; and

Step S5: The exhaust gas cooling device cools the negative pressure pipeline and/or the vacuum pump to reduce the air discharged by the vacuum pump.

As can be seen from the above technical solutions, the embodiments of the present invention at least have the following advantages and positive effects:

1) Provide negative pressure to the negative pressure chamber of the negative pressure generating cover through the vacuum pump. Since the negative pressure chamber is connected to the coating gap, when the hot melt adhesive in the molten state is pumped out from the coating head, the air sucked away can be absorbed. The negative pressure pulling force towards the negative pressure cavity is applied to the hot-melt glue, so that the hot-melt glue is elongated to form a film. When the coating roller rotates to drive the substrate to pass through the coating gap, the elongated hot-melt glue can interact with the substrate. The surface is bonded, and the coating is continuously formed on the substrate as the coating roller rotates. Using this non-contact method, the coating of the hot melt adhesive on the substrate is realized, and the thickness of the coating can be changed from The running speed of the coating roller and the vacuum degree of the negative pressure air are adjusted, so as to facilitate the formation of a coating layer with a uniform thickness, which is beneficial to improve the coating quality of the solar backplane in the actual production process. The exhaust gas is cooled to reduce the generation of high-temperature exhaust gas and reduce the pollution to the environment;

2) The provided non-contact hot-melt adhesive lamination method applies the non-contact hot-melt adhesive lamination system to the lamination process of the solar backplane, and can also be automatically adjusted to form a uniform coating on the solar backplane substrate. It can improve the quality of products, and is also conducive to the realization of environmental protection.

3) In addition to photovoltaic backplane coating, the above non-contact hot melt adhesive film coating system can also be widely used in new materials, lithium batteries, electronic label tapes and other fields.

Description of drawings

1 is a schematic diagram of the overall structure of a non-contact hot-melt adhesive lamination system in one or more embodiments of the present invention;

Fig. 2 is the enlarged view of A part in Fig. 1;

3 is a schematic diagram of the principle of adhesion of a film of a non-contact hot melt adhesive lamination system to a substrate in one or more embodiments of the present invention;

4 is a schematic diagram of the overall structure of a non-contact hot melt adhesive lamination system in one or more embodiments of the present invention;

5 is a schematic structural diagram of a rubber material recovery device in one or more embodiments of the present invention;

FIG. 6 is a flow chart of a method for coating a solar back sheet in one or more embodiments of the present invention.

Among them, the meanings of the reference signs are as follows:

1. Hot melt adhesive feeding device; 2. Metering pump; 3. Frame; 4. Coating head; 5. Feeding pipeline; 6. Coating roller; 7. Substrate; 701, film; 8. Coating Clearance; 9. Negative pressure generating cover; 901, Negative pressure chamber; 902, Holding tank; 10, Vacuum pump; 11, Negative pressure pipeline; 12, Exhaust gas cooling device; 1201, Air cooler; 12011, Cooling fan; 12012, Air Cooling fins; 12013, air cooling pipes; 1202, liquid coolers; 12021, cooling liquid supply pumps; 12022, cooling tanks; 12023, liquid cooling pipes; 13, first conveying rollers; 14, second conveying rollers; 15, Slide plate; 16, sliding seat; 17, first sealing block; 18, second sealing block; 19, adjusting screw; 20, compression spring; 21, linear push mechanism; 2101, regulating motor; 2102, screw rod; 22, thermometer ; 23, heat conduction pipe; 24, rubber material recovery device; 2401, fixed shell; 2402, filter screen; 2403, receiving box; 2404, fastening screw.

Detailed ways

For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Example 1

Referring to FIGS. 1 to 5, the present invention discloses a non-contact hot-melt adhesive laminating system, including a hot-melt adhesive feeding device 1, a metering pump 2, a frame 3, a coating head 4, a coating roller 6, Coating drive motor (not shown in the figure), negative pressure generating cover 9, vacuum pump 10, exhaust gas cooling device 12 and controller (not shown in the figure), wherein:

A hot melt adhesive feeding device 1 is used for heating and supplying hot melt adhesive to the outside.

The hot-melt adhesive feeding device 1 is in the prior art, and mainly includes a heating device for heating the hot-melt adhesive material, the structure of which is not repeated here.

The hot melt adhesive material used for lamination can be a common epoxy resin material.

The metering pump 2 is connected to the outlet end of the hot melt adhesive feeding device 1 for pumping out the hot melt adhesive in a molten state.

The metering pump 2 is usually a common metering pump 2, which can detect and adjust the amount of the hot melt adhesive pumped out and the speed of the hot melt adhesive pumped out.

The coating head 4 is arranged on the frame 3 and is connected to the metering pump 2 through the feeding pipeline 5, so that the metering pump 2 can pump the hot melt adhesive in the molten state generated by the hot melt adhesive feeding device 1 to the coating head 4. out;

The coating head 4 has an elongated coating outlet for pumping out the hot melt adhesive, and the coating outlet extends along the axial direction of the coating roller 6 .

The coating roller 6 is rotatably arranged on the frame 3 and is drivingly connected with the coating driving motor, which can be rotated under the driving of the coating driving motor, and drives the substrate 7 to be transported forward. The coating outlet of the coating head 4 It is disposed toward the coating roll 6, and the coating head 4 and the substrate 7 on the coating roll 6 maintain a coating gap 8, which depends on the situation, and is generally 0.5 mm to 15 mm.

The negative pressure generating cover 9 is arranged on the frame 3, and the negative pressure generating cover 9 is in contact with the surface of the coating head 4 and the coating roller 6, so that a semi-closed connection with the coating gap 8 is formed in the negative pressure generating cover 9. The negative pressure chamber 901;

The vacuum pump 10 is connected with the negative pressure generating cover 9 through the negative pressure pipeline 11, and is used for sucking the air in the negative pressure generating cover 9 to provide negative pressure for the negative pressure chamber 901. The negative pressure is mainly concentrated at the coating gap 8 .

The exhaust gas cooling device 12 is connected with the negative pressure pipeline 11 and/or the vacuum pump 10 , and is used for cooling the air discharged through the negative pressure pipeline 11 and the vacuum pump 10 .

The controller is electrically connected with the hot melt adhesive feeding device 1, the metering pump 2, the coating drive motor, the vacuum pump 10 and the exhaust gas cooling device 12, and is used to control the hot melt adhesive feeding device 1, the metering pump 2, the coating drive The motor, the vacuum pump 10 and the exhaust gas cooling device 12 operate.

The controller can be a PLC, a single-chip computer or an industrial computer, or other computer units in the prior art that can receive and send data and instructions.

Therefore, based on the non-contact hot melt adhesive laminating system of the present invention, during the lamination process, the coating roller 6 is driven to rotate by the coating driving motor, and the substrate 7 is transported by other rollers in the prior art structure (for example, in the figure). The first conveying roller 13 and the second conveying roller 14) are conveyed through the coating roller 6, and are rotated through the coating gap 8 under the driving of the coating roller 6. At the coating gap 8, the vacuum pump 10 generates a negative pressure cover. The air in 9 is sucked away, so that a negative pressure can be generated, such as P shown in the figure, the negative pressure P can pull the hot melt glue pumped from the coating head 4 to the direction of the negative pressure cavity 901, Thus, a film 701 is formed, and the film 701 can adhere to the coating roller 6 and continuously form a coating on the substrate 7 with the rotation of the coating roller 6; in addition, due to the existence of negative pressure, it also makes When the film 701 is covered on the substrate 7, bubbles are not easily generated, thereby making the film more uniform and of better quality.

Since the sucked gas contacts the molten hot melt adhesive, the temperature is relatively high. If the gas is directly discharged into the atmosphere, it will cause environmental pollution. The exhaust gas cooling device 12 can cool the negative pressure exhaust gas extracted by the vacuum pump 10, and then It is discharged for environmentally friendly production.

Due to different requirements for the thickness of the coating film and different materials of the hot melt adhesive material used, there is a need to adjust the coating gap 8 between the coating head 4 and the coating roller 6 .

In one embodiment, the coating head 4 is slidably arranged with the frame 3, and is provided with a locking mechanism (not shown in the figure) for locking the coating head 4, so that the coating gap 8 can be adjusted.

In one embodiment, as shown in FIG. 1 , the coating head 4 is arranged along the radial direction of the coating roll 6, that is, the coating head 4 points to the rotation center of the coating roll 6, and the coating head 4 slides with the frame 3 The connection can be moved in a direction close to or away from the center of the coating roller 6 to achieve the purpose of adjusting the coating gap 8 .

More specifically, a sliding seat 16 is fixedly arranged on the frame 3 , the coating head 4 is arranged on a sliding plate 15 , and the sliding plate 15 is slidably matched with the upper surface of the sliding seat 16 .

Of course, in order to improve the sliding stability of the coating head 4 , a guide rail (not shown in the figure) may also be provided between the sliding plate 15 and the sliding seat 16 on the frame 3 .

The locking mechanism may be a snap structure, a screw or a bolt and nut mechanism, or other common locking structures in the prior art that can fix the coating head 4 on the frame 3, which is not limited in the present invention.

In other embodiments, the coating head 4 may also be arranged not to point to the center of rotation of the coating roll 6 .

In one embodiment, as shown in FIG. 1 and FIG. 2 , the negative pressure generating cover 9 is provided with a first sealing block 17 and a second sealing block 18 , the first sealing block 17 is attached to the coating head 4 , and the second sealing block 17 is The sealing block 18 is in contact with the surface of the coating roller 6 .

By arranging the first sealing block 17 and the second sealing block 18, the connection gap between the negative pressure generating cover 9 and the coating head 4 and the coating roller 6 can be sealed, so that the negative pressure generated by the vacuum pump 10 is mainly concentrated in coating At the gap 8, the phenomenon of negative pressure leakage is reduced to maintain the stability of the film 701.

Further, in one embodiment, as shown in the figure, the negative pressure generating cover 9 is provided with an accommodating groove 902, the second sealing block 18 is movably arranged in the accommodating groove 902, and the negative pressure generating cover 9 is provided with an adjustment The screw 19 and the adjusting screw 19 are in contact with the side of the second sealing block 18 facing away from the coating roller 6 .

Due to the relative rotation of the coating roller 6 and the second sealing block 18, the second sealing block 18 will be lost due to friction, and the second sealing block 18 and the surface of the coating roller 6 will not be closely attached. The screw 19 can adjust the second sealing block 18, which is convenient to adjust the position of the sealing block, so as to keep it closely attached to the surface of the coating roller 6, so as to achieve a better sealing effect, reduce the leakage of negative pressure, and generate the film 701. stability.

In one embodiment, as shown in FIG. 2 , the adjusting screw 19 is also sleeved with a compression spring 20 .

By arranging the compression spring 20, the compression spring 20 can provide elastic force for the second sealing block 18, so that the second sealing block 18 has a certain self-adjustment ability, and realizes the automatic filling of the second sealing block 18 with the coating roller 6 due to friction loss. gaps between the surfaces.

In one embodiment, the frame 3 is provided with a linear push mechanism 21, the linear push mechanism 21 is connected to the coating head 4, and the linear push mechanism 21 is controlled by a controller for driving the coating head 4 relative to the machine The frame 3 slides to adjust the coating gap 8 .

In this way, the action of the linear pushing mechanism 21 can be controlled by the controller, and then the coating head 4 can be driven to move to achieve the purpose of adjusting the coating gap 8, which is beneficial to the automation of the control.

In some embodiments, the linear pushing mechanism 21 can be a telescopic cylinder, and the telescopic cylinder can be a hydraulic telescopic cylinder, a pneumatic telescopic cylinder or an electric telescopic cylinder.

The linear push mechanism 21 may also adopt other linear drive devices. For example, in one embodiment, the linear push mechanism 21 includes an adjustment motor 2101, a screw rod 2102 and a nut (not shown in the figure), and the adjustment motor 2101 is fixedly arranged on the machine. Frame 3, the nut is fixed with the sliding seat 16, the adjusting motor 2101 is electrically connected with the controller, and the adjusting motor 2101 is drivingly connected with the lead screw 2102, the lead screw 2102 is threadedly connected with the nut, and the lead screw 2102 is away from the end of the adjusting motor 2101 It is rotatably connected with the sliding plate 15 .

The controller controls the adjustment motor 2101 to rotate, and then drives the sliding plate 15 to slide relative to the sliding seat 16 through the screw rod 2102 , that is, drives the coating head 4 to slide relative to the frame 3 to achieve the purpose of adjusting the coating gap 8 .

In one embodiment, the exhaust gas cooling device 12 may be disposed at the outlet end of the vacuum pump 10 to cool the gas discharged from the vacuum pump 10 before discharging. In this embodiment, the exhaust gas cooling device 12 may be conventional air cooling Or liquid cooling equipment, such as refrigeration fans or evaporators.

In one embodiment, the exhaust gas cooling device 12 includes an air cooler 1201 and a liquid cooler 1202 , and both the air cooler 1201 and the liquid cooler 1202 are connected to the negative pressure pipeline 11 .

The exhaust gas passing through the negative pressure pipe 11 is cooled by the air cooler 1201 and the liquid cooler 1202 by air cooling and liquid cooling respectively.

More specifically, the air cooler 1201 includes a cooling fan 12011, an air-cooling fin 12012, and an air-cooling duct 12013. The air-cooling fin 12012 is fixed outside the negative pressure duct 11, and the air-cooling fin 12012 is arranged inside the air-cooling duct 12013. The cooling fan 12011 communicates with the air cooling duct 12013 , and the cooling fan 12011 is controlled by the controller, and can provide flowing air for the air cooling duct 12013 .

The cooling fan 12011 provides flowing air for the air-cooling duct 12013, and the heat conducted on the air-cooling fins 12012 is taken away by the airflow to realize air-cooling heat dissipation, and the cooling fan 12011 is controlled and controlled by the controller, that is, the cooling fan 12011 and the control The device is electrically connected, so that the speed of the cooling fan 12011 can be adjusted by the controller, thereby adjusting the efficiency of air cooling, and helping to control the temperature of the gas passing through the negative pressure pipe 11 .

The liquid cooler 1202 includes a cooling liquid supply pump 12021, a cooling tank 12022 and a liquid cooling pipe 12023. The bottom side and the top side of the cooling tank 12022 are respectively provided with an air inlet (not marked in the figure) and an air outlet (not marked in the figure) , the air inlet is connected to the negative pressure pipe, the air outlet is connected to the vacuum pump 10, the liquid cooling pipe 12023 is arranged through the cooling tank 12022, and at least the part of the liquid cooling pipe 12023 located inside the cooling tank 12022 is a spiral pipe, and the cooling liquid supply pump 12021 It is communicated with the liquid cooling pipe 12023, and the cooling liquid supply pump 12021 is controlled by the controller, and can supply the cooling liquid to the liquid cooling pipe 12023 from bottom to top.

When the vacuum pump 10 sucks the air in the negative pressure generating cover 9 into the cooling tank 12022, the flowing cooling liquid takes away the heat in the air through the cooling pipe to realize liquid cooling. Since the cooling liquid supply pump 12021 is controlled by the control The controller, that is, the cooling liquid supply pump 12021 is electrically connected to the controller, so that the controller can adjust the operating speed of the cooling liquid supply pump 12021 to adjust the flow and speed of the cooling liquid entering the cooling tank 12022, so as to adjust the air flow rate. temperature purpose.

In one embodiment, a thermometer 22 is provided on the cooling tank 12022, and the detection head of the thermometer 22 is placed in the cooling tank 12022 to detect the temperature of the gas in the cooling tank.

The temperature of the gas in the cold extraction tank is detected by the thermometer 22 , thereby providing conditions for regulating the operation of the exhaust gas cooling device 12 .

Further, the thermometer 22 adopts an electronic type, and the controller of the thermometer 22 is electrically connected, so that the temperature value of the gas in the cold extraction tank detected by the thermometer 22 can be fed back to the controller, and the controller can be based on the feedback temperature value and preset temperature. The values are compared, and then the operation of the exhaust gas cooling device 12 is regulated according to the comparison result, which is beneficial to realize the process of automatic regulation.

In one embodiment, the coating roller 6 is provided with a heat-conducting pipe 23 inside, and the heat-conducting pipe 23 communicates with the air-cooling pipe 12013 and/or the liquid-cooling pipe 12023 for connecting the air-cooling pipe 12013 and/or the liquid-cooling pipe 12023 The heat of the fluid is transferred to the surface of the coating roll 6 .

More specifically, in order to simplify the structure, the heat-conducting pipe 23 is set to be coaxial with the coating roller 6, and its outer shell is provided with a bearing, so that the heat-conducting pipe 23 can rotate relative to the coating roller 6, so as to prevent the rotation of the coating roller 6 from affecting the heat conduction. Pipe 23 causes structural damage and simplifies structural design.

Through the above arrangement, the heat recovered by the exhaust gas cooling device 12 can be conducted to the coating roller 6 for heating the coating roller 6 , and then the substrate 7 can be preheated through the coating roller 6 , and the substrate 7 can be reduced in size. The temperature difference with the thin film 701 makes the tightness of the thin film 701 and the substrate 7 combined better, especially in the production environment where the ambient temperature is low, the effect it plays is more obvious, so that the waste heat can be fully utilized, and the resources are fully utilized. The purpose of utilization is to achieve environmentally friendly production.

In one embodiment, a plurality of heat-conducting pipes 23 can be provided, and each heat-conducting pipe 23 is arranged in a nested manner, so that different heat-conducting pipes 23 can be communicated with the air-cooling pipe 12013 and the liquid-cooling pipe 12023 to realize the separation of gas and liquid. .

Of course, a heat conduction pipe 23 can also be directly connected to the air cooling pipe 12013 and the liquid cooling pipe 12023, that is, heat conduction to the coating roller 6 in the manner of mixing gas and liquid.

Further, an electric control valve (not shown in the figure) can be set at the entrance of the heat conduction pipe 23, and the electric control valve is electrically connected with the controller, so that the gas or liquid flow rate entering the heat conduction pipe 23 can be controlled by the controller. The adjustment has the effect of adjusting the preheating temperature of the coating roller 6 .

For example, when the temperature difference between the base material 7 and the hot melt adhesive needs to be increased, the gas or liquid flow rate entering the heat conduction pipe 23 can be increased;

When the temperature difference between the base material 7 and the hot melt adhesive needs to be reduced, the flow rate of gas or liquid entering the heat conduction pipe 23 can be reduced.

In one embodiment, as shown in FIG. 4 , at least two negative pressure pipes 11 are provided, and one of the negative pressure pipes 11 is arranged just below the vertical projection of the coating gap 8 , and the negative pressure pipes 11 are also provided with The rubber material recovery device 24 is used to filter the rubber material impurities in the negative pressure air of the negative pressure pipeline 11 .

The negative pressure pipeline 11 located just below the vertical projection of the coating gap 8 not only plays the role of providing negative pressure, but also serves the purpose of sucking the remaining rubber material, and then passes through the rubber material recovery device 24 to pass the negative pressure. The sizing impurities in the gas in the pipeline 11 are filtered, and then the vacuum pump 10 and the negative pressure pipeline 11 are protected to avoid damage to the vacuum pump 10 or blockage of the negative pressure pipeline 11 .

In one embodiment, as shown in FIG. 5 , the rubber material recovery device 24 includes a fixed casing 2401, a filter screen 2402, and a receiving box 2403 detachably connected to the fixed casing 2401. The fixed casing 2401 is provided with a negative pressure supply The inlet end (not marked in the figure) and the outlet end (not marked in the figure) connected by the pipeline 11; the filter screen 2402 is arranged on the receiving box 2403, and is used to filter the air flowing through the receiving box 2403 so that the filtered impurities are retained in the receiving box 2403. In the receiving box 2403, the arrow Q in the figure indicates the direction of the airflow.

More specifically, the receiving box 2403 is connected to the fixed housing 2401 by tightening the screws 2404. When the receiving box 2403 needs to be cleaned, it is only necessary to disassemble the tightening screws 2404 to separate the receiving box 2403 from the fixed housing 2401, and then the receiving box 2403 needs to be removed. The impurities collected in the box 2403 can be cleaned up, and the materials can be recycled, and then the filter screen 2402 can be cleaned or replaced.

In summary, the non-contact hot-melt adhesive film coating system provided by the present invention applies a negative pressure pulling force toward the negative pressure cavity 901 to the hot-melt adhesive through negative pressure, so that the hot-melt adhesive is elongated to form the film 701, When the coating roller 6 rotates to drive the substrate to pass through the coating gap 8, the elongated hot-melt glue can bond with the surface of the substrate, and as the coating roller 6 rotates, a coating film is continuously formed on the substrate. This non-contact method realizes the coating of the hot melt adhesive on the substrate, and since the thickness of the coating can be adjusted by the running speed of the coating roller 6 and the vacuum degree of the negative pressure air, it is convenient to form a coating layer with a uniform thickness , which is beneficial to improve the coating quality of the solar back sheet in the actual production process. In addition, the exhaust gas is cooled by the exhaust gas cooling device 12 to reduce the generation of high-temperature exhaust gas and reduce environmental pollution.

Example 2

Referring to FIG. 6 , the present embodiment discloses a non-contact hot-melt adhesive coating method, which is used in the coating production process of solar back sheets, and adopts a non-contact hot-melt adhesive coating system, including:

Step S1: the hot-melt adhesive feeding device 1 heats the hot-melt adhesive material to a molten state;

Step S2: the metering pump 2 pumps out the hot melt adhesive in the molten state by the hot melt adhesive feeding device 1 and delivers it to the coating head 4;

Step S3: The vacuum pump 10 works to provide negative pressure air to the negative pressure chamber 901 of the negative pressure generating cover 9, and at the coating gap 8 between the coating roller 6 and the coating head 4, the negative pressure air is used for coating. The hot melt adhesive output from the head 4 provides a negative pressure pulling force in the direction of the negative pressure cavity 901, and then the film 701 is formed;

Step S4: The coating roller 6 rotates, and the solar back sheet substrate 7 is driven through the coating gap 8. The film 701 formed in step S3 adheres to the solar back sheet substrate 7 and continues with the rotation of the coating roller 6. ground film on the solar back sheet substrate 7; and

Step S5 : the exhaust gas cooling device 12 cools the negative pressure pipeline 11 and/or the vacuum pump 10 to reduce the air exhausted by the vacuum pump 10 .

In one embodiment, the solar back sheet coating method of the present invention further includes step S6: detecting the coating thickness on the solar back sheet substrate 7, and when the coating thickness is lower than the first preset thickness value, the The controller reduces the running speed of the coating driving motor and/or reduces the working power of the vacuum pump 10, that is, the running speed of the coating driving motor can be reduced only by the controller, thereby reducing the rotating speed of the coating roller 6, Thereby, the forward speed of the solar back sheet substrate 7 is reduced, so that the thin film 701 has sufficient time for adhesion and deposition, so as to increase the thickness of the film;

It is also possible to reduce the working power of the vacuum pump 10 only through the controller, that is, to reduce the suction negative pressure of the vacuum pump 10, thereby reducing the pulling force of the negative pressure on the hot melt adhesive to pull and unfold the film, so that the thickness of the film 701 can be reduced. increase, can also achieve the purpose of increasing the thickness of the coating.

Of course, the operation speed of the coating driving motor and the working power of the vacuum pump 10 can be reduced at the same time through the controller.

When the thickness of the coating film is higher than the second preset thickness value, the operating speed of the coating driving motor and/or the working power of the vacuum pump 10 are increased through the controller.

The adjustment distance is opposite to the above-mentioned first case (ie, when the thickness of the coating film is lower than the first preset thickness value), and will not be repeated here.

The detection of the film thickness can be performed manually through a ruler, or the film thickness on the solar backplane substrate 7 can be measured by an ultrasonic thickness measurement sensor, a capacitive thickness measurement sensor or a laser thickness measurement sensor.

In one embodiment, step S5 further includes, when the thickness of the coating film is lower than the first preset thickness value, controlling the action of the linear pushing mechanism 21 through the controller to drive the coating head 4 to the direction close to the coating roller 6 Move to reduce the coating gap 8, in this way, the coating gap 8 is reduced, the time for pulling the film 701 under negative pressure is shortened, and the thickness of the film 701 is increased;

On the contrary, when the film thickness is higher than the second preset thickness value, the linear push mechanism 21 is controlled by the controller to act to drive the coating head 4 to move away from the coating roller 6 to increase the coating gap 8 In this way, the coating gap 8 is increased, the time for the negative pressure to pull the film 701 is prolonged, and the formed thickness of the film 701 is reduced.

In one embodiment, the method for coating the solar back sheet of the present invention further includes step S7: detecting the temperature of the gas in the cooling tank 12022, and when the gas temperature is higher than a preset temperature value, the controller increases the operation of the cooling fan 12011 speed and/or increase the operating speed of the coolant supply pump 12021.

When the temperature is below the preset temperature, the exhaust gas satisfies the emission requirement, and when the gas temperature is higher than the preset value, the controller increases the working efficiency of the exhaust cooling device 12 and reduces the temperature of the exhaust gas.

To sum up, the solar back sheet lamination method provided can form a uniform thin film 701 on the solar back sheet substrate 7 by applying the non-contact hot melt adhesive lamination system to the lamination process of the solar back sheet. , improve product quality, but also help to achieve environmental protection.

The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims (10)

1. A non-contact, hot melt adhesive lamination system, comprising:

the hot melt adhesive supply device (1) is used for heating and supplying hot melt adhesive to the outside;

the metering pump (2) is connected with the outlet end of the hot melt adhesive feeding device (1) and is used for pumping out the hot melt adhesive in a molten state;

a frame (3);

the coating head (4) is arranged on the frame (3) and is connected with the metering pump (2) through a feeding pipeline (5);

a coating roll (6) rotatably arranged on the frame (3), a coating outlet of the coating head (4) is arranged towards the coating roll (6), and the coating head (4) and a substrate (7) on the coating roll (6) keep a coating gap (8);

the coating driving motor is in driving connection with the coating roller (6) and is used for driving the coating roller (6) to rotate;

a negative pressure generating cover (9) arranged on the frame (3), wherein the negative pressure generating cover is attached to the surfaces of the coating head (4) and the coating roller (6) to form a semi-closed negative pressure cavity (901), and the negative pressure cavity (901) is communicated with the coating gap (8);

a vacuum pump (10) connected to the negative pressure generating cover (9) through a negative pressure pipeline (11) for sucking air in the negative pressure generating cover (9) to provide negative pressure to the negative pressure cavity (901);

the tail gas cooling device (12) is connected with the negative pressure pipeline (11) and/or the vacuum pump (10) and is used for cooling air exhausted by the negative pressure pipeline (11) and the vacuum pump (10); and

the controller, with hot melt adhesive feedway (1), measuring pump (2) coating driving motor vacuum pump (10) and the equal electric connection of tail gas cooling device (12) are used for control hot melt adhesive feedway (1), measuring pump (2) coating driving motor vacuum pump (10) and tail gas cooling device (12) operation.

2. The non-contact hot melt adhesive lamination system according to claim 1, wherein the applicator head (4) is slidably disposed with the frame (3) and a locking mechanism is provided for locking the applicator head (4) to enable adjustment of the application gap (8).

3. The non-contact hot melt adhesive lamination system according to claim 2, wherein a linear pushing mechanism (21) is provided on the frame (3), the linear pushing mechanism (21) is connected with the coating head (4), and the linear pushing mechanism (21) is controlled by the controller for driving the coating head (4) to slide relative to the frame (3) to adjust the coating gap (8).

4. The non-contact hot melt adhesive laminating system according to claim 3, characterized in that the exhaust gas cooling device (12) comprises an air cooler (1201) and a liquid cooler (1202), wherein both the air cooler (1201) and the liquid cooler (1202) are connected with a negative pressure pipeline (11).

5. The non-contact hot melt adhesive laminating system according to claim 4, wherein the air cooler (1201) comprises a cooling fan (12011), air-cooling fins (12012) and air-cooling ducts (12013), the air-cooling fins (12012) are fixed outside the negative pressure ducts (11), the air-cooling fins (12012) are arranged inside the air-cooling ducts (12013), the cooling fan (12011) is communicated with the air-cooling ducts (12013), and the cooling fan (12011) is controlled by the controller and can provide flowing air for the air-cooling ducts (12013).

6. The non-contact hot melt adhesive laminating system according to claim 5, wherein the liquid cooler (1202) comprises a cooling liquid supply pump (12021), a cooling tank (12022) and a liquid cooling pipeline (12023), wherein the bottom side and the top side of the cooling tank (12022) are respectively provided with an air inlet and an air outlet, the air inlet is communicated with the negative pressure pipeline (11), the air outlet is connected with the vacuum pump (10), the liquid cooling pipeline (12023) penetrates through the cooling tank (12022), at least a part of the liquid cooling pipeline (12023) located inside the cooling tank (12022) is a spiral pipe, the cooling liquid supply pump (12021) is communicated with the liquid cooling pipeline (12023), and the cooling liquid supply pump (12021) is controlled by the controller, so that cooling liquid can be supplied to the liquid cooling pipeline (12023) from bottom to top.

7. The non-contact hot melt adhesive laminating system according to claim 1, characterized in that the negative pressure pipelines (11) are at least two, one of the negative pressure pipelines (11) is arranged right below the vertical projection of the coating gap (8), and a sizing material recovery device (24) is further arranged on the negative pressure pipeline (11) and used for filtering sizing material impurities in the negative pressure air of the negative pressure pipeline (11).

8. A non-contact hot melt adhesive lamination method, wherein the non-contact hot melt adhesive lamination system of claim 6 is used, comprising:

step S1: the hot melt adhesive feeding device (1) heats the hot melt adhesive material to a molten state;

step S2: the metering pump (2) pumps out the hot melt adhesive in a molten state by the hot melt adhesive feeding device (1) and conveys the hot melt adhesive to the coating head (4);

step S3: the vacuum pump (10) works to provide negative pressure air to a negative pressure cavity (901) of the negative pressure generating cover (9), and negative pressure pulling force towards the direction of the negative pressure cavity (901) is provided for hot melt adhesive output by the coating head (4) by the negative pressure air at a coating gap (8) between the coating roller (6) and the coating head (4), so that a film (701) is formed;

step S4: the coating roller (6) rotates to drive the base material (7) to pass through the coating gap (8), the film (701) formed in the step S3 is adhered to the base material (7), and the film is continuously coated on the base material (7) along with the rotation of the coating roller (6); and

step S5: the exhaust gas cooling device (12) cools the negative pressure pipeline (11) and/or the vacuum pump (10) so as to reduce the air exhausted by the vacuum pump (10).

9. The film coating method according to claim 8, further comprising step S6: detecting the thickness of a coating film on the base material (7), and reducing the running speed of a coating driving motor and/or reducing the working power of a vacuum pump (10) through a controller when the thickness of the coating film is lower than a first preset thickness value;

when the coating film thickness is higher than the second preset thickness value, the running speed of the coating driving motor is increased and/or the working power of the vacuum pump (10) is increased through the controller.

10. The film coating method according to claim 8, further comprising step S7: the temperature of the gas in the cooling tank (12022) is detected, and when the gas temperature is higher than a preset temperature value, the controller increases the operating speed of the cooling fan (12011) and/or increases the operating speed of the coolant supply pump (12021).

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