Patent Application
20090260757
This present invention discloses a machine and method for adhering flexible photovoltaic film panels onto metal supplied from a roll for forming a combination solar and roof panel. The photovoltaic film panels and the metal to which it is adhered are supplied on rolls which are fed from reels into a rollformer with a special attachment to produce the roofing panel with the photovoltaic film panels.
Photovoltaic devices provide reliable sources of electrical energy. Thin film photovoltaic devices are particularly advantageous since they are relatively low in cost, flexible, and capable of being manufactured in relatively large sizes by continuous deposition processes. Such thin film devices can be encapsulated in transparent, durable, flexible polymeric bodies, and are ideally suited for building mounted installations.
These thin photovoltaic film panels can be applied to roofs by adhering the film panels directly to the roof. An adhesive can be placed on the bottom of the film panel to which a backing material is attached. The backing material can be removed and the film panel placed on the roof so that the adhesive will adhere the film to the roof. This photovoltaic film panels can be applied to the roof in areas where the roof receives sufficient sunlight.
The electricity of the photovoltaic film panels is transmitted to contact terminals which typically extend from one end of the photovoltaic area of the panel, and may be connected to a junction box or other connector device for transmitting to supply power to the building or into the electricity grid that supplies a city or an area.
The thin photovoltaic film can be placed on a roll or reel and supplied to a roof by unrolling the film and removing the backing and pressing the adhering film to the roof. This manual process is a very labor intensive procedure and sometimes resulted in the photovoltaic film not being properly adhered to the roof. Roofs are subjected to high winds and other weather conditions that may damage or remove the photovoltaic material.
A machine and method are needed for applying the photovoltaic film panels to roofs to save labor costs and to improve reliability of the adhesion of the film panels to the roof.
The present invention relates to a process by which a solar film panel with an adhesive on the bottom and a backing protecting the adhesive is combined with metal to produce a combination sheet of a solar panel and a metal roofing material. This combination solar film panel and metal can used for roof panels, wall panels and ground mount solar panels.
As shown in
A means is needed for removing the backing 46 from the solar panels. A recoiler with a motor 40 may be used to remove the backing 46 from the solar panels so that the adhesive can adhere the solar panel to the metal.
The solar panels with adhesive applied can be disconnected from the solar coil 22 by using a brake, such as a mechanical brake 42, attached to the solar decoiler 20 holding the solar coil 22. This brake 42 will apply tension at the proper time to allow the previously perforated adhesive backing 46 to part or break free from the adhesive. The length of the solar panel may be less than that of the metal sheet to which it is applied.
The metal and solar films are pressed together by pressure rolls 32, 34 so the adhesive binds them together. Then the metal and solar film are run through a rollformer 12 to form the edge profiles for the metal sheet 26 and any holes or other features that are needed. This rollformer is made by Schlebach-Maschinen GmbH, Friedewald, Germany. Other rollformers may be used. This type of machine is often taken to the customer's house or building and the coil of steel is then unrolled and cut and bent into architectural sheets of different lengths and configuration. The machine can also be used in a factory environment. The roof, soffit, nail strip and other configurations and metal can be formed by the machine shown in
The following is a list of parts for the machine of this invention:
The rollformer 12 in
Nearly any metal that has sufficient flexibility and thinness can be formed on the rollformer 10. Among these metals are copper, zinc, stainless steel, galvanized steel, pre-painted steel, gavalume, and aluminum. These metals are placed on the decoiler reel 16 so that they can be unrolled freely.
The solar panels in a coil 22 can be placed on a similar decoiler 20 which can be unrolled freely. Any type of photovoltaic film panels of sufficient flexibility can be used with this invention. This solar film panels 80 may have an adhesive on the bottom to which a backing 46 is applied. This backing 46 is removed from the solar film panels by recoiler with a motor 40. The solar coil 22 can be adjusted laterally or perpendicular to decoiling (processing) direction with the cross adjust hand-wheel 44 to provide accurate alignment of the solar panels 28 to the metal 26, and to accommodate the various panel widths and seam configurations.
One type of film that can be combined with metal on the rollformer 10 is a thin film that has an amorphous silicon solar cell design. The amorphous silicon is desirable because it can be made into a very thin material. Many other types of thin film can be utilized. Other technologies such as CIGS, CdTE or other aSi technologies could be used provided they are packaged in such a manner to perform in the roofing environment. An adhesive can be placed on the back of the panel with a backing 46. It can be adhered to metal with the same type of machine 10 described herein.
A specific thin photovoltaic film panel is solar laminate PVL-Series manufactured by Unisolar Ovinic LLC. Model PVL-136 has the amorphous silicon solar cells encased in a laminate of ethylene tetrafluoroethylene polymer (ETFE). An adhesive such as HelioBond PVA 600BT, which is a thermal butyl adhesive tape, can be used for adhering the photovoltaic film panels to a surface such as a roof. This photovoltaic film can be as thin as 4 mm. The solar panels as shown in
Any type of photovoltaic film panel which can be rolled into a coil and can be used to form the combination of a photovoltaic film panel and a metal panel.
Prior to entering the rollformer 12, the metal 26 is pulled off of metal coil 18 and the solar film panels 27 are pulled off of solar film coil 22 by drive 53 rollers. The metal and the photovoltaic film panel travel from right to left as shown in
In respect to
The operator then loads an empty core onto the cantilevered release liner take-up shaft or recoiler with a motor 40 and attaches the leader film to the core of the recoiler. The operator then threads the solar panel through the machine, under the machine encoder (not shown), and winds the leader film up to position the edge of the solar panel at the peel plate adjacent pressure rollers.
The pressure rollers 32, 34 are in the open position. The metal is threaded through the rollers and into the rollformer 12. When a solar panel is needed, the operator activates the pressure rollers and a pre-set amount of solar panel indexes into rollers 32, 34. The bottom roller 34 then moves up, bringing the metal sheet 26 to the laminating position.
The drive rollers 53 of the rollformer 12 then pulls the metal and solar panel through the pressure rollers 32, 34 for the length of the solar panel, e.g. 18 feet. When the length of solar panel has been fully applied, the brake 42 on the decoiler 20 actuates stopping the coil 22 and allowing the solar panel 80 to separate from the coil 22 at the glue gap between solar panels 80. While the solar panel 80 is being applied, the recoiler 40 shaft is winding up the solar panel backing 46. For positioning a solar panel 80 on the leading edge of the metal, a motor (not shown) is mounted adjacent the pressure rollers 32, 34 to reverse the metal 26 from the rollformer 12 after it has been sheared.
The rollformer 12 has a pair of guides 48 to make sure that the laminated metal and solar panels 47 are properly aligned in entering into the rollformer 12.
The rollformer 12 has a metal cutter 50 to cut the metal prior to the lamination of the metal and the photovoltaic film panels being processed. This metal cutter 50 may be independent of cutting or separating the solar panel backing 46. It may be necessary to cut the backing for the solar panels 46 independently of the metal 26. The solar panels may be of a length shorter than the length of the metal. Having a perforated backing 46, and brake 42 on the solar coil decoiler 20 and a metal cutter 50 will allow the independent cutting of the two components. There typically would be a gap on the metal where there is no solar film panel so that the metal can be cut easily. It will be necessary for the metal cutter 50 to be programmed so that it does not cut the solar panel.
The metal cutter 50 can be a rotary shear which is two independent sets of rolling knives. It may have a lower wheel and an upper wheel that act as a pair of rotary scissors or rotary shears and cut the metal traversing from one side of the sheet to the other. The metal cutter 50 could also be a guillotine shear which would move straight down. The metal cutter could also be a flat bottom blade with just one wheel cutting across it. A pair of rotary wheels may be preferred.
The combination of the metal and the solar film panel enter the rollformer 12 which consists of a series of rolling dies 52 that will form the metal flanges into the various configurations; it could be a snap lock, mechanical lock, or nail strip panel of varying heights. There are multiple pairs of rolling dies 52 on each side of the rollformer 12 arranged in cassettes for rapid profile changeover. These cassettes mount on each side of the frame of the rollformer 12. These rollformer 10 have drive rollers 53 to help form the profile on each side of the sheet and to move the sheet through the rollformer 10. One of the cassettes forms a male side of the sheet with forming rollers 52 and the other forms the female side so the metal panels can be fitted together.
After rollforming the combination of the metal and the photovoltaic film panels, the combination will exit the rollformer 12 at exit 54. This will be a strip of metal with a solar panel firmly attached which can be used to form a roof for a building.
The rollformer with decoiler and laminator 10 preferably have a single control 56. controlling both operations.
It is possible to use the process and machine of this invention with in-plant rollformers as it is preferred to use on-site rollformers.
Other systems, methods, features, and advantages of the present invention will be or become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the present invention, and be protected by the accompanying claims.
This application claims priority to U.S. Provisional Application having Ser. No. 61/045,454 filed Apr. 16, 2008, which is entirely incorporated hereby by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61045454 | Apr 2008 | US |
