Patent Application
20170225190
The present technology relates to systems and methods of sealing against leaks of water and air, and the intrusion of insects, through specific types of joints that occur primarily in the out-most surface envelopes of buildings, whether on roofs or walls, and whether of residential, commercial or industrial architecture. One current method of sealing what are commonly referred to as lap joints (such as where metal flashings overlay other roofing or wall components to form a dynamic joint) consists primarily of taking bulk, pasty sealants (frequently based on asphaltic chemicals) out of 1-gallon cans or 5-gallon pails with a trowel and then smearing the sealant onto the area of the targeted lap joint in an attempt to effect a reliable, leak-proof seal. This bulk application and smearing process is inherently an imprecise method of sealant application and leads to a variety of problems, especially for inexperienced people, including: inconsistent thicknesses of sealant from location to location (with some sealant typically being smeared too thinly to avoid failure), wasted sealant (by being applied too widely and with some sealant being applied excessively thick), wasted time, wasted labor costs, messy application, high cleanup costs, ugly appearance, and frequent sealant failure. Some lap joints, illustrating another common sealing method, are currently sealed with forms of pressure-sensitive tapes, such as the high-tack tapes routinely applied to the lap joints formed where window nailing fins overlap the OSB or plywood sheathing that typically comprises the exterior wall underlayment in common residential and light commercial construction; and such tapes do experience appreciable levels of failure, particularly when used in cold weather, due to poor adhesion of such tapes in low-temperature conditions. In addition and more recently, aerosol-spray-applied rubberized sealant-coatings have been touted as being an effective and efficient means of sealing such lap joints. However, such spray-on products have been widely reported to have experienced many failures and complaints from users due to not being able to build sufficient sealant thickness in one or even two applications to reliably work; or requiring the applicator to apply many, many coats of spray-on product in order to build sufficient film thickness to be reliably effective. The present technology overcomes the aforementioned drawbacks that current sealing methods suffer from delivering the highest possible quality (including an attractive appearance), and doing so while saving a great deal of time, effort, clean-up, and material.
While many types of dispensing nozzles for caulks and sealants are well known in the architectural construction and repair trades, including fan nozzles that produce wide ribbon beads of sealant, none of them have ever delivered a satisfactory performance. Conventional fan nozzles that have been known in the trade, for example, have typically dispensed a wide flat bead of sealant, i.e. a ribbon bead, in a roughly rectangular cross-sectional profile, with the wide ribbon bead of sealant being merely deposited in a “passive” manner as it exits the nozzle from, typically, a caulking cartridge onto a surface without any appreciable tooling-force being automatically applied by the nozzle to the pasty, semi-fluid sealant during application. Such a tooling-force is needed to aggressively drive the semi-fluid sealant into the substrates being sealed in order to achieve good surface wetting and adhesion because semi-fluid sealants do not readily flow and wet surfaces on their own (like thin liquids do). When using such conventional fan nozzles, which are well represented by the fan nozzle assortments offered by such companies as Albion Engineering, for example, it is a best practice to then employ follow-up tooling, say with a trowel or putty knife, to forcefully push the semi-fluid ribbon of sealant into the substrates to be sealed for the best possible wetting and adhesion. When such secondary tooling is then done, it wastes time and increases labor cost, and there is always a tendency to inadvertently thin out the thickness of the sealant in some areas excessively, which can then lead to sealant failure, resulting in building leaks. Secondary tooling also means that the tools used to force the sealant into intimate contact with the surfaces being sealed need to be cleaned, taking more time and labor.
Other sealant application nozzles have also been known in other trades, such as the aerospace industry, but all such previous sealant nozzles have been ill-designed and unsuitable for use in sealing lap joints found on typical architectural construction. For example, nozzles sold under the Semco tradename, such as models #425 and #429, have proven unacceptable for sealing architectural lap joints. For example, such nozzles are not wide enough to cover lap joints effectively. They do not have angled orifice surface, which causes a lack of tooling force, which requires tooling labor and time. Furthermore, their rectangular orifice wastes material.
Non-limiting and non-exhaustive embodiments of the present invention, including the preferred embodiment, are described with reference to the following figures, wherein like reference numerals refer to like parts throughout the various views unless otherwise specified.
This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary, and the foregoing Background, is not intended to identify key aspects or essential aspects of the claimed subject matter. Moreover, this Summary is not intended for use as an aid in determining the scope of the claimed subject matter.
The present disclosure provides a sealant applicator nozzle and methods of using the same. In various embodiments, the sealant applicator nozzle includes an inlet end portion, having a first width, and an opposite outlet end portion, having a second width that is wider than the first width. The outlet end portion has a concave contact surface that extends across the second width and surrounds an outlet orifice. In some embodiments, the contact surface is disposed at a contact surface angle with respect to a longitudinal plane that passes through the first width and the second width. In particular embodiments, the contact surface angle is between 30 degrees to 60 degrees. In other embodiments, the contact surface angle is between 40 degrees to 50 degrees.
Embodiments of the sealant applicator nozzle provide the contact surface with a concave tooling edge positioned at a distal-most end of the sealant applicator nozzle to tool the bead of sealant as it is dispensed. The outlet end portion has a cross-sectional shape that helps to define the bead of sealant dispensed by the sealant applicator nozzle. In some embodiments, the cross-sectional shape of the outlet end portion is elliptical, biconvex, or plano-convex.
Methods of applying a sealant to a surface using the sealant applicator nozzle of the present technology are provided herein. In various embodiments, the method includes positioning a concave contact surface of a sealant applicator nozzle closely adjacent the surface, wherein the sealant applicator nozzle includes an inlet end portion and an opposite outlet end portion that are fluidly coupled with one another by a nozzle interior that extends along a length of the sealant applicator nozzle. In some embodiments the inlet end portion has a first width and the outlet end portion has a second width that is wider than the first width. The sealant is dispensed from an outlet orifice in the concave contact surface onto the surface. In various embodiments the concave contact surface is disposed at an angle with respect to a longitudinal plane that passes through the first width and the second width.
In various embodiments, the dispensing step includes shaping the sealant into a ribbon bead, having an arched geometry that tapers at opposite edges of the ribbon bead. The shaping is induced by a tooling edge of the contact surface as the sealant is dispensed from the sealant applicator nozzle. In various embodiments, the arched geometry is defined by a cross-sectional shape of the outlet end portion. In particular embodiments, the cross-sectional shape of the outlet end portion is elliptical, biconvex, or plano-convex. In certain methods, the surface receiving the sealant is a lap joint and the arched geometry is centered on the lap joint. The sealant can be dispensed by manually applying pressure to a sealant container or from a pressurized sealant container.
These and other aspects of the present system and method will be apparent after consideration of the Detailed Description and Figures herein. It is to be understood, however, that the scope of the invention shall be determined by the claims as issued and not by whether given subject matter addresses any or all issues noted in the Background or includes any features or aspects recited in this Summary.
Embodiments are described more fully below with reference to the accompanying figures, which form a part hereof and show, by way of illustration, specific exemplary embodiments. These embodiments are disclosed in sufficient detail to enable those skilled in the art to practice the invention. However, embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. The following detailed description is, therefore, not to be taken in a limiting sense.
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In at least one method of use, the sealant applicator nozzle 10 of the present technology applies a wide ribbon of sealant in a smoothly arched geometry (forming a segment of a circle) over a lap joint 26 so that the thickest part of the arch is centered directly on the edge of the overlapping material that forms the lap joint 26. In so doing, as inevitable thermal expansion/contraction occurs at the lap joint 26, it is assured that ample sealant material is present to accommodate such movement without cohesively failing, which can occur if the sealant thickness is too thin over the lap joint 26. In particular embodiments, some ribbon beads 24 have a width of 1.25 inches and a height of 0.125 inches. In other embodiments, the ribbon beads have a width of 0.875 inches and have a height of 0.0625 inches. Other dimensions are contemplated, based on the needs presented by the sealing operation. In addition, the thickness of the arched ribbon of sealant smoothly declines away from the center of the ribbon bead 24 on both sides until the thickness becomes essentially zero at the two edges of the ribbon bead 24, which greatly reduces the amount of sealant that would otherwise be applied. In particular embodiments, the sealant savings can be at least 30%, depending on the radius of curvature chosen, when compared with a conventional ribbon bead, having a rectangular bead profile.
The sealant applicator nozzle 10 of the present technology automatically tools a ribbon bead 24 of sealant as it is applied to ensure that the semi-fluid sealant is forcefully driven into the substrates that are being sealed. This automatic tooling-force reliably and consistently drives the semi-fluid sealant into contact with the substrates being sealed so that excellent surface wetting by the sealant occurs, which increases adhesion. Laboratory experiments have consistently demonstrated that the sealant applicator nozzle 10 of the present technology drives sealants into the substrates being sealed deeper than conventional nozzles. This testing was done over new and well-stretched common screen-door screens. Conventional fan nozzles merely laid a ribbon bead 24 of sealant on the surface of the screen in a passive manner, with little or no sealant being driven through the screen holes. The sealant applicator nozzle 10, however, vigorously pushed a large volume of sealant through the square holes of the screen while the sealant applicator nozzle 10 was smoothly drawn over the screen surface. The design allows the sealant applicator nozzle 10 to be drawn over a lap joint 26 at about a 45 degree angle (in one embodiment), allowing the applicator to easily glide, with minimal “catching”, over irregularities that are very frequently present on roof surfaces and wall substrates.
The geometry of the sealant applicator nozzle 10 ensures that beads 24 of sealant can be applied in a precise and consistent manner. The arch-shaped and automatically well-tooled bead 24 of sealant is applied in one pass. Accordingly, no secondary tooling is needed (like with a putty knife or trowel) and there is no need for clean-up of any kind. Compared to other methods, like spray-on, thin liquid sealants, which typically require several successive applications over lap joints, the present technology saves considerable time and labor, which saves overall costs. Moreover, the bead 24 of sealant that is placed with the sealant applicator nozzle 10, of the present technology, has an attractive aesthetic appearance, especially when clear sealants are used, which is more appealing than beads produced by previously known methods.
Various embodiments of the sealant applicator nozzle 10 can effectively be used with many caulk-gun sealants in cold weather to seal the edges of window nailing fins (where the fins overlap OSB or plywood wall sheathing), replacing pressure-sensitive tapes that are failure-prone in low temperatures. Such sealants can work reliably with the sealant applicator nozzle 10, in part, because such sealants have sufficient fluidity and a temporarily reduced glass-transition temperature (due to the presence of polymer-dissolving solvents or initially un-crosslinked reactive polymers), even when cold, to wet out and establish good adhesion with a variety of surfaces, such as plywood and PVC.
Embodiments of the sealant applicator nozzle 10 can be affixed to a pressurized canister of sealant so that a perfectly shaped and automatically tooled bead 24 of sealant can be conveniently applied to lap joints without the use of a caulking gun. Using the sealant applicator nozzle 10 with a pressure-can aerosol also eliminates the risk of wind-blown over-spray onto unintended surfaces below a roof, such as windows and automobiles. Additionally, when dispensed from a high-pressure pressurized canister, sealants, such as Sashco's Through-The-Roof, can be applied at high speeds, saving a great deal of time, labor, and money.
The sealant applicator nozzle 10, of the present technology, can be used to particularly great effect with clear sealants, such as Sashco's Through-The-Roof or Lexel sealants, because such clear sealants readily permit the applicator to see the lap joint 26 through the sealant and keep the center of the sealant nozzle 10 positioned directly over the edge of the lap joint 26 during application so that the thickest part of the bead 24 is consistently deposited directly over the center of said lap joint 26.
Although the technology been described in language that is specific to certain structures, materials, and methodological steps, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific structures, materials, and/or steps described. Rather, the specific aspects and steps are described as forms of implementing the claimed invention. Since many embodiments of the invention can be practiced without departing from the spirit and scope of the invention, the invention resides in the claims hereinafter appended. Unless otherwise indicated, all numbers or expressions, such as those expressing dimensions, physical characteristics, etc. used in the specification (other than the claims) are understood as modified in all instances by the term “approximately.” At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the claims, each numerical parameter recited in the specification or claims which is modified by the term “approximately” should at least be construed in light of the number of recited significant digits and by applying ordinary rounding techniques. Moreover, all ranges disclosed herein are to be understood to encompass and provide support for claims that recite any and all subranges or any and all individual values subsumed therein. For example, a stated range of 1 to 10 should be considered to include and provide support for claims that recite any and all subranges or individual values that are between and/or inclusive of the minimum value of 1 and the maximum value of 10; that is, all subranges beginning with a minimum value of 1 or more and ending with a maximum value of 10 or less (e.g., 5.5 to 10, 2.34 to 3.56, and so forth) or any values from 1 to 10 (e.g., 3, 5.8, 9.9994, and so forth).
The present application is a non-provisional of U.S. Provisional Patent Application Ser. No. 62/291,643, titled “SEALANT APPLICATOR AND METHODS OF USE”, filed Feb. 5, 2016, which is incorporated herein as if set out in full.
| Number | Date | Country | |
|---|---|---|---|
| 62291643 | Feb 2016 | US |
