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Alcan aluminum foil flyers specials
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If you find a product unsuitable and wish to return the item for exchange or credit, please note the following: - Goods returned must be in the original unopened packacking, with all original labels still attached. The tube 20 is then passed through a heater 48 to heat the tube 20 to a predetermined temperature greater than a temperature at which the powdered coating material 46 melts. The powdered coating material 46 is then sprayed over the tube 20 by a spraying mechanism 49 so that portions of the powdered coating material 46 melt and adhere onto the exposed portions 20a of the tube The heating of the tube 20 can be controlled to cause a precise amount of powder to stick to the tube since the heat transfer characteristics of the tube as well as similar heat exchanger components are uniform and predictable.
The spraying mechanism 49 may include a spraying assembly 50, a reservoir 51 of powdered coating material 46, and a compressed air source 52 for propelling the powdered coating material 46 through sprayer 50 and over the tube A collection bin 53 may also be provided under the spraying mechanism 49 for collecting the powder overspray.
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After the spraying step, the coating material is allowed to cool and harden into a solid coating 54 on exposed areas 20a of the tube The masking material 47 may then be removed from the tube 20 as shown by arrow In the alternate embodiment shown in FIG. In particular, instead of spraying a powdered composition onto the tube, a pair of presses 56 are used to bring solid filaments 44 into contact with the exposed areas 20a of the heated tube Similar to the powder spray method, the heating of the tube can be carefully controlled to melt a precise amount of the filament 44 onto the tube.
The filaments 44 may also be easily directed to apply the coating material to only selected areas of the tube, as well as using masking material After the coating composition is melted onto the tube 20, the coating material is allowed to cool and harden into a solid coating material and the masking material 47, if used, is removed as previously described.
The methods of the present invention for applying the coating composition to the tube 20 or any other article to be brazed are diagrammatically illustrated in a flow chart shown in FIG. The illustrated method steps may be accomplished by following the specific steps described in connection with FIGS. By following the methods shown in FIGS. For example, the inventive methods may be advantageously used for applying the differential coating compositions 33, 34 and 35 to the tube 20 as shown in FIGS.
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After the coating process, the articles or tubes can be packaged for storage or shipment, at room temperature, for later use in the brazing process. In addition, the coating methods of this invention may be used to apply other types of coatings to articles for a variety of purposes other than brazing.
At the left side of FIG. The tubes 20 include the first, second and third differential coatings 33, 34 and 35 as previously described. After the components are assembled to form assembly 57, a conventional bake frame not shown may be used to hold the assembly in a rigid and desired shape. The assembly 57 is then placed on a conventional conveyer belt 58 to carry it through the brazing process. The first step in the brazing process is to preheat the assembly 57 with a heater 59 to a predetermined temperature sufficient to substantially gasify and remove the hot melt adhesive medium 40 from the differential coatings 33, 34 and 35 on the tubes.
The adhesive medium 40 is removed in the form of a gaseous medium 60, which may be reclaimed for recycling with a reclaiming unit In particular, the reclaiming unit 61 includes a fan 62 which draws the gasified medium off of the assembly 57 and circulates the gas over a plurality of cooled plates The gasified medium 60 then hardens and adheres to the cooled plates 63 as shown at Subsequently, the plates 63 may be heated to liquify and drain the solid material 64 into suitable containers for later re-use or recycling.
This permits the manufacturer to recycle the same hot melt adhesive medium a number of times for repeating the coating process for a plurality of articles. After such preheating, the assembly 57 will include only the selected brazing materials 39 of the coatings and there is no adhesive or vehicle material left on the assembly 57 to interfere with the brazing process or to leave an undesirable residue on the assembly that my cause corrosion.
Importantly, such hot melt adhesive mediums do not combine chemically with any of the standard brazing materials, such as flux, brazing alloy, silicon, zinc, etc.
tincsergolasro.gq After the preheating step, the brazing materials 39 will continue to adhere to the tubes 20 even after the medium is removed, although not as strongly as when the medium is present. However, strong adhesion is not required at this point because the assembly is completed and there is no substantial handling of the assembly except for passing the assembly 57 through a brazing oven Since only the brazing materials 39 are left on the assembly 57, the assembly 57 is cleanly and efficiently brazed in the conventional brazing oven 65 to produce a high-quality assembly In the foregoing methods, it is important that the hot melt adhesive medium 40 take the form of a material that will not leave a carbon residue on the assembly For example, many adhesives are hydrocarbons and heating such adhesives will cause the bonds between the carbon and hydrogen atoms to break so that carbon residue is left on the finished product.
Such carbon residue can cause corrosion initiation sites to undesirably form on the finished product.
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The inventor has discovered that simple compounds of the hot melt glue family are particularly suitable for use in the present invention. Specifically, such materials will retain their carbon atoms during the preheating step so that the adhesive medium 40 is substantially gasified and removed from the assembly 57 during the preheating process so that no carbon residue is left on the assembly In addition, such adhesive mediums do not chemically combine with standard brazing materials.
One particularly suitable adhesive medium from the ethylenevinyl acetate base chemical family and is generally referred to as "all purpose hot melt glue sticks" available from Black and Decker Canada, Inc. The tests were performed using a plurality of aluminum coupons which were accurately weighed using a scale to find their "original weight". The hot melt glue was then applied to each of the coupons and the coupons were then weighed again.
The coupons were then weighed again. The results of these tests demonstrated that the aluminum coupons after heating weighed the same as before application of the hot melt glue. Stated differently, the hot melt glue retained its carbon atoms through the heating process such that no undesirable carbon residue was left on the coupons. While such materials from the hot melt glue or ethylene-vinyl acetate base family are believed to be particularly suitable for use in the present invention, it will be understood that other materials having similar properties and characteristics may also be used.
The brazing method of the present invention is also diagrammatically shown in the flow chart in FIG. As shown, the method includes the steps of first extruding the tubes and then sizing and cutting the tubes for the desired assembly. The tubes are then coated with the coating compositions of the present invention as previously described in connection with FIGS. The tubes are then assembled to the headers and fins to form the assembly The assembly is then preheated to substantially gasify and remove the hot melt adhesive medium from the coatings on the tubes.
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During the preheating step, the hot melt adhesive medium may be reclaimed for later use. The assembly is then brazed to form a finished product. The brazing method of the present invention may be accomplished by employing the steps generally described in connection with the schematic process shown in FIG. However, it will be understood that a variety of conventional apparatuses may be used in practicing the brazing method of the present invention. While in the foregoing specification embodiments of the invention have been disclosed in considerable detail for purposes of illustration, it will be understood by those skilled in the art that the details given herein may vary considerably within the spirit and scope of this invention.
Effective date : Year of fee payment : 4. Year of fee payment : 8. Year of fee payment : 7. Methods of brazing and coating and preparing articles for brazing and coating are disclosed. Prior to assembly and brazing, the articles are coated with a coating composition including a hot melt adhesive medium and brazing materials. To coat the articles, the hot melt adhesive medium and brazing materials are first mixed at elevated temperatures to form a liquid coating material, the material is allowed to harden, and the hardened material is then melted onto the articles to form a hard coating.
The coated articles are then assembled for brazing. During the brazing process, the articles are first preheated to a sufficient temperature to substantially gasify and remove the hot melt adhesive medium from the articles.
This leaves only the brazing materials on the articles for clean and efficient brazing of the articles in a conventional brazing oven. In one embodiment, the hot melt adhesive medium takes the form of a hot melt glue from the chemical family of ethylene-vinyl acetate bases. I claim: 1. A method of preparing an article for brazing, said method comprising the steps of: providing an article for brazing;. The method of claim 1 in which said at least one brazing material includes a flux material and a brazing alloy.
The method of claim 1 in which said at least one brazing material includes powdered zinc.
The method of claim 1 in which said at least one brazing material includes silicon. The method of claim 1 in which said hot melt adhesive medium comprises an ethylene-vinyl acetate base. The method of claim 1 in which said step of providing an article for brazing includes providing an elongated extruded microtube. The method of claim 1 including the further step of allowing said coating composition to cool and harden into a solid material after said mixing step and in which said step of applying said coating composition includes melting said solid material onto a surface of said article.
The method of claim 9 including the further step of forming said solid material into a solid filament and said step of applying said solid material to said article includes heating said article to a predetermined temperature and bringing said solid filament into contact with a heated portion of said article such that portions of said solid filament melt onto said article. The method of claim 10 in which said step of heating said article to said predetermined temperature includes heating said article to a temperature greater than a temperature at which said solid filament melts.
The method of claim 9 including the further step of shredding said solid material into a powdered coating material and said step of applying said solid material to said article includes heating said article to a predetermined temperature and spraying said powdered coating material over said article such that portions of said powdered coating material melt onto said article. The method of claim 12 in which said step of heating said article to said predetermined temperature includes heating said article to a temperature greater than a temperature at which said powdered coating material melts.