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Publication numberUS20050031819 A1
Publication typeApplication
Application numberUS 10/916,326
Publication dateFeb 10, 2005
Filing dateAug 11, 2004
Priority dateJan 14, 2003
Also published asCA2513031A1, CA2513031C, CN1750922A, CN100594120C, EP1590167A2, EP1590167A4, US7223455, US20040137181, WO2004065115A2, WO2004065115A3
Publication number10916326, 916326, US 2005/0031819 A1, US 2005/031819 A1, US 20050031819 A1, US 20050031819A1, US 2005031819 A1, US 2005031819A1, US-A1-20050031819, US-A1-2005031819, US2005/0031819A1, US2005/031819A1, US20050031819 A1, US20050031819A1, US2005031819 A1, US2005031819A1
InventorsKurt Mankell, Murray Toas, Greg Mattix, John Ruid, David Tomchak
Original AssigneeMankell Kurt O., Toas Murray S., Greg Mattix, Ruid John O., David Tomchak
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Duct board with low weight water repellant mat
US 20050031819 A1
Abstract
A duct board or duct liner product is provided comprising an insulating layer formed from fibrous material bound with a resin binder; an outer facing layer adhered to an outer surface of the insulating layer; and a water repellant mat facing adhered to an interior surface of the insulating layer opposite the outer surface to form a duct board material, the mat facing having a weight of less than 1.1 lb/100 ft2 (53.6 g/m2) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method.
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Claims(25)
1. A duct board or duct liner product, comprising:
an insulating layer formed from fibrous material bound with a resin binder;
an outer facing layer adhered to an outer surface of the insulating layer; and
a water repellant mat facing adhered to an interior surface of the insulating layer opposite the outer surface to form a duct board material, the mat facing having a weight of less than 1.1 lb/100 ft2 (53.6 g/m2) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method.
2. The duct board or duct liner of claim 1, wherein the weight of said mat facing is less than about 1.0 lb/100 ft2 (48.73 g/m2).
3. The duct board or duct liner of claim 1, wherein the weight of said mat facing is between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.97 lb/100 ft2 (47.5 g/m2).
4. The duct board or duct liner of claim 1, wherein the mat facing is formed from a non-woven fiber material having a water repellent material integral therein.
5. The duct board or duct liner of claim 4, wherein the mat facing comprises non-woven glass fibers bound with a resin.
6. The duct or duct liner of claim 1, wherein the mat facing is adhered to a surface of said insulating layer by an adhesive, said adhesive and insulating layer being substantially free of water repellent additives or agents.
7. The duct board or duct liner of claim 1, wherein the mat facing comprises a non-woven fiberglass and water repellant material comprising a fluorinated polymer, said mat facing having a weight between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.97 lb/100 ft2 (47.5 g/m2).
8. The duct board or duct liner of claim 1, wherein the resin binder in at least a portion of said insulating layer is formed from a resin in an aqueous carrier mixed with a hydrophobic agent in emulsion form.
9. The duct board or duct liner of claim 8 wherein the hydrophobic agent is present in said binder in a ratio of about 1:200 to 1:5 hydrophobic agent to binder.
10. The duct board or duct liner of claim 9, wherein said hydrophobic agent is selected from the group consisting of emulsions, latexes, silicone, oil, fluorocarbon and waxes.
11. The duct board or duct liner of claim 1, wherein:
the mat is adhered to a surface of said insulating layer by an adhesive containing a first hydrophobic agent, and
the resin binder in at least a portion of said insulating layer contains a second hydrophobic agent.
12. The duct board or duct liner of claim 11, wherein the first hydrophobic agent is one of the group consisting of emulsions, latexes, silicone, oil, fluorocarbon and waxes.
13. The duct board or duct liner of claim 11, wherein the resin binder in the portion of said insulating layer is formed from a resin in an aqueous carrier mixed with a hydrophobic agent in emulsion form.
14. The duct board or duct liner product according to claim 1, wherein the duct board material is formed in a tubular shape capable of conducting air, with the mat facing on an interior thereof.
15. A method for forming a duct board or duct liner product, comprising:
(a) adhering an outer facing layer to an outer surface of an insulating layer formed from fibrous material bound with a resin binder; and
(b) adhering a water repellant mat facing to an interior surface of the insulating layer opposite the outer surface to form a duct board material, the mat facing having a weight of less than 1.1 lb/100 ft2 (53.6 g/m2) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method.
16. The method of claim 15, further comprising forming the duct board material into a tubular shape capable of conducting air, with the mat facing on an interior thereof.
17. The method of claim 15, wherein the weight of the mat facing is less than about 1.0 lb/100 ft2 (48.73 g/m2).
18. The method of claim 15, wherein the weight of the mat facing is between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.97 lb/100 ft2 (47.5 g/m2).
19. The method of claim 18, wherein the mat facing is formed from a non-woven fiber material having a water repellent material integral therein.
20. The method of claim 19, wherein the mat facing comprises glass fibers bound with a resin.
21. The method of claim 20, wherein the mat facing is adhered to a surface of said insulating layer by an adhesive, said adhesive and insulating layer being substantially free of water repellent additives or agents.
22. The method of claim 15, wherein the mat facing comprises a non-woven fiberglass and water repellant material comprising a fluorinated polymer, said mat facing having a weight between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.97 lb/100 ft2 (47.544.2 g/m2).
23. A duct board or duct liner product, comprising:
an insulating layer formed from fibrous material bound with a resin binder;
an outer facing layer adhered to an outer surface of the insulating layer; and
a non-woven glass fiber mat facing adhered to an interior surface of the insulating layer opposite the outer surface to form a duct board material, said mat facing having a water repellent material integral therein, the mat facing having a weight of between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.97 lb/100 ft2 (47.5 g/m2) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method,
wherein the mat is adhered to a surface of said insulating layer by an adhesive, said adhesive and insulating layer being substantially free of water repellent additives or agents.
24. The duct board or duct liner product according to claim 23, wherein the duct board material is formed in a tubular shape capable of conducting air, with the mat facing on an interior thereof.
25. The duct board or duct liner product according to claim 23, wherein said water repellent material comprises a fluorinated polymer.
Description
CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent application Ser. No. 10/342,849, entitled “Duct Board With Water Repellant Mat” filed Jan. 14, 2003, the entirety of which is hereby incorporated by reference herein in its entirety.

This application is related to U.S. patent application Ser. No. 10/141,595, entitled “Duct Board Having Two Facings” filed May 8, 2002, the entirety of which is hereby incorporated by reference herein in its entirety.

FIELD OF THE INVENTION

The present invention relates to building products in general and, in particular, to duct board and duct liner materials and ducts made therefrom.

BACKGROUND

Ducts and conduits are used to convey air in building heating, ventilation and air conditioning (HVAC) systems. In many applications, especially in commercial and industrial construction, the ducts are lined with flexible thermal and sound insulating material. The lining enhances the thermal efficiency of the duct work and reduces noise associated with movement of air therethrough. Duct liner may comprise any suitable organic material or inorganic material, e.g., mineral fibers such as fiber glass insulation or the like. Typical fiber glass duct liners, for example, are constructed as fiber glass mats having densities of about 1.5 to 3 pounds per cubic foot (pcf) and thicknesses of about 0.5 to 2 inches. To prevent fiber erosion due to air flow, the insulation may include a coating of on its inner or “air stream” surface. The air stream surface of the insulation is the surface that conveys air through the duct and is opposite the surface that contacts the duct sheet metal in the final duct assembly. The coating also serves to protect the insulation during brush and/or vacuum cleaning of the interior of the duct. Examples of duct liners having coatings on their inner surfaces are provided in U.S. Pat. Nos. 3,861,425 and 4,101,700. Several coated insulation duct liners or boards are marketed under the trade designations Toughgard® and Ultra*Duct™ Gold by CertainTeed Corp. of Valley Forge, Pa., Aeroflex® and Aeromat® by Owens Corning Fiberglas Corp. of Toledo, Ohio, Permacote®, Polycoustic™ by Johns Manville Corp. of Denver, Colo. and Knauf Airduct Board-M by Knauf Insulation of Shellbyville, Id.

Other insulated HVAC systems use ducts either fabricated from or lined with rigid duct boards or tubes. Duct boards are rigid members formed from resin-bonded mineral fibers and whose air stream surfaces may also be provided with protective coatings. Duct boards typically have densities of about 3 to 6 pounds per cubic foot (pcf) and thicknesses of between about 0.5 to 2 inches. Coated and uncoated duct boards are marketed under a variety of trade designations from the aforementioned manufacturers of duct liners. Whether provided on duct liners or duct boards, dedicated water-resistant coatings add to the cost and complexity of manufacturing these products.

It is well known that microorganisms will grow in an environment where moisture and nutrients are present and that many species of microorganisms have a negative impact on indoor air quality (IAQ). If liquid water leaks into air duct insulation, the water may collect and stagnate in the insulation and support the growth of microorganisms.

To address the problem of microorganism growth in HVAC systems, U.S. Pat. Nos. 5,314,719; 5,379,806; 5,487,412 and 5,783,268 disclose providing antimicrobial agents on or in the air-conveying surfaces of impermeable duct liners and/or duct boards. However, these antimicrobial agents have very limited zones of effectiveness. That is, they tend to prevent microbe formation only in their immediate vicinity. U.S. Pat. No. 5,314,719, for example, describes a zone of antifungal inhibition of about one millimeter. Typical duct liners and duct boards have insulation thicknesses ranging from about one-half to two inches. In these products, such a limited zone of inhibition would be essentially useless in preventing microorganism formation caused by duct insulation that becomes saturated by water entering through the exterior walls and seams of the duct.

Moisture impermeable coatings, if applied to the airstream surface of air duct insulation products, inhibit ingress of water into the insulation and attendant microorganism formation therein. U.S. Pat. No. 3,861,425 discusses providing HVAC ducts either composed of or lined with fibrous glass insulation media such as batts, mats, boards or the like with such coatings. While certain coatings may provide the benefits of fiber erosion protection and moisture resistance, they add to the cost and complexity of the products and their methods of manufacture. Coatings applied to the air stream surface of fibrous insulation products are applied to those products after their formation. This requires application of the coating to the previously formed insulation product by brush, roller, sprayer or by some other means or method and thereafter allowing the coating to cure or dry. This post-formation coating step may prolong the time required to manufacture the insulation product and, whether performed manually or automatically, must be carefully monitored in order to assure uniformity in application of the coating.

As an alternative to coated duct liners and duct boards, at least CertainTeed Corp. and Knauf Fiber Glass GmbH offer duct liners or duct boards having glass fiber insulation covered with a layer of non-woven facing material which defines the air stream surface of those products. The facing material produces a durable surface that protects the air duct from fiber erosion.

However, both uncoated fibrous insulation HVAC duct products and some products that are covered with facing material possess limited inherent moisture resistance. Consequently, they are susceptible to microorganism formation in the event they become wet.

Further, the coating selected for these coated duct liners and duct boards can significantly add to the products cost.

SUMMARY OF THE INVENTION

A duct board or duct liner product and method of making the same is provided. The duct board or duct liner product comprises an insulating layer formed from fibrous material bound with a resin binder; an outer facing layer adhered to an outer surface of the insulating layer; and a water repellant mat facing adhered to an interior surface of the insulating layer opposite the outer surface to form a duct board material, the mat facing having a weight of less than 1.1 lb/100 ft2 (53.6 g/m2) and having at least an INDA 2 water repellence rating using the IST 80.6-92 water repellency test method.

By limiting the weight of the nonwoven facing, significant cost savings can be realized while providing a cost effective, abuse resistant water repellant airstream surface for the mineral fiber duct product. Additional cost savings can be realized in embodiments where no additional water repellent is added to the binder of the duct board or adhesive used to adhere the nonwoven to the duct board.

In one embodiment, the mat facing has a water repellent material integral therein and the mat facing has a weight of between about 0.80 lb/100 ft2 (39.0 g/m2) and 0.91 lb/100 ft2 (44.2 g/m2). The mat is adhered to a surface of said insulating layer by an adhesive, and the adhesive and insulating layer are substantially free of water repellent additives or agents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross sectional view of a duct board material according to one embodiment.

FIG. 2 is a diagram of apparatus for forming the insulation layer of the material shown in FIG. 1.

FIG. 3 is a diagram of apparatus for applying the mat facing to the duct board material shown in FIG. 1.

FIG. 4 is an isometric view of the duct board of FIG. 1, after it is folded into an air duct.

DETAILED DESCRIPTION

Application Ser. No. 09/789,063, filed Feb. 20, 2001, and application Ser. No. 09/788,760, filed Feb. 20, 2001 are incorporated by reference herein in their entireties.

This description of the exemplary embodiments is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description. In the description, relative terms such as “lower,” “upper,” “horizontal,” “vertical,”, “above,” “below,” “up,” “down,” “top” and “bottom” as well as derivative thereof (e.g., “horizontally,” “downwardly,” “upwardly,”etc.) should be construed to refer to the orientation as then described or as shown in the drawing under discussion. These relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation. Terms concerning attachments, coupling and the like, such as “connected” and “interconnected,” refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

FIG. 1 is a cutaway view of a portion of a duct board or duct liner material 10. A duct board or duct liner 10 comprises an insulating layer 12, 13 formed from fibrous material bound with a resin binder, an outer facing layer 18 adhered to an outer surface of the outer insulating layer portion 13 and a water repellant mat facing 14 adhered to an interior surface of the inner insulating layer portion 12 opposite the outer facing layer 18 to form a duct board or duct liner material. The mat facing 14 provides sufficient water repellency to repel a mixture of about 40% isopropanol and about 60% water under IST Test No 80.6-92. The mat facing 14 may optionally provide sufficient water repellency to repel a mixture of greater than 40% isopropanol. The duct board or duct liner material 10 is formed into a tubular shape capable of conducting air, with the mat facing 14 on an interior thereof. FIG. 4 shows an exemplary air duct formed from the duct board 10. A duct liner would have a similar appearance, but would have a lower density suitable for placement inside a duct. Although a rectangular duct is shown the duct may be formed into a non-rectangular tubular shape, such as round or oval, as is known in the art.

The mat facing 14 may be formed from a woven or non-woven fiber material. The material may be inherently water repellant, or it may be treated with a water repellant material that includes a treatment such as wax-asphalt emulsion, silicone or fluorocarbon, for example, to provide the desired water repellency.

A preferred mat material 14 has a water repellency sufficient to repel a drop including at least 80% isopropyl alcohol and water for a minimum of five minutes, using an IST 80.6-92 test method. Materials that repel up to 100% isopropyl alcohol in an IST 80.6-92 test may be used. In some preferred embodiments, the mat 14 is formed from water repellant 40# Manniglass 1886 Black mat or 1786 Black mat from Lydall Inc. of Green Island, N.Y. or water repellant Elasti-Glass® 3220B mat from Johns Manville of Denver, Colo.

In other embodiments, the mat 14 is formed from filament glass fibers in an acrylic-based binder, such as Johns Manville Dura-Glass® 8440 with a water repellant (e.g., silicone or fluorocarbon) applied thereto.

Other mat materials providing similar or better degrees of water repellency may alternatively be used. For example, such materials may include non-woven mats of glass fibers randomly dispersed into a web in a wet-laid process, bound in an acrylic or other resin system, and post treated with a fluorocarbon based coating that provides the desired degree of water repellency.

Product 10 comprises an insulating layer 12, 13 of mineral fibers such as glass fibers, refractory fibers or mineral wool fibers bonded by a suitable resin and mat facing 14 of adhered thereto by adhesive 16, wherein the facing material 14 defines the air stream surface for the board or tube. Binders that may be used to bind the fibers of insulating layer 12, 13 may include, without limitation, the phenolic binders disclosed in U.S. Pat. Nos. 5,300,562 and 5,473,012, the disclosure of which are incorporated herein by reference. Product 10 may have a density of about 0.5 to 6 pounds per cubic foot (pcf) and a thickness of between about 1.27 to 5.08 centimeters (0.5 to 2 inches). The thickness and density of insulation layer 12, 13 is dictated by whether the product is a duct board or duct liner, and is also influenced by the levels of acoustic and/or thermal insulation that are desired or necessary for a particular building installation. One of ordinary skill in the art understands that other known duct board fabrication processes may be used.

Although the piece of duct board material shown in FIG. 1 has a female shiplap edge and a male shiplap edge with a strip of the outer facing layer 18 overhanging the male shiplap edge, other configurations are formed with or without shiplap edges.

In some embodiments, the water repellant mat facing 14 alone provides the desired degree of water repellency. In other embodiments, as described below, the water repellency of the product 10 is enhanced by an additive in either the binder of the insulation layer 12, 13, the adhesive joining the facing 14 to the insulation 12, or both.

As will be appreciated by reference to FIG. 1, the insulation layer 12, 13 is formed as a series of accumulated layers of resin-bonded fibers which, in the end product, may be intertwined and appear and exist as a continuous homogeneous mass rather than as a plurality of distinct or discrete strata or lamina. For simplicity of illustration and explanation, product 10 is referred to below as comprising first and second portions 12 and 13, although typical rigid duct boards and tubes include many bound layers. The location of the dashed line between portions 12 and 13 is optional. In some embodiments, portions 12 and 13 are continuous and of identical composition, and may be considered a single layer. In other embodiments, as described below, portion 12 has an additive not contained in portion 13, portion 13 has an additive not contained in portion 12, or portion 12 and 13 contain different additives. In some embodiments, portion 12 is thicker. In other embodiments, portion 13 is thicker.

In some embodiments, the water repellency of the duct board or tube is optionally enhanced by incorporating a hydrophobic agent into the binder of at least one of the portions 12, 13. In one example, the hydrophobic agent is incorporated into portion 12 which is closer to the air stream surface of product 10, and adjacent to the facing 14; portion 13 does not, therefore, have to have the hydrophobic agent in the binder thereof, but may. In this way, liquid water or other aqueous liquids from the interior of the duct which penetrates facing 14 is further repelled from entering product 10, thereby reducing the likelihood of microbial growth in the insulation. Preferably, a foil/scrim/paper laminate or other suitable vapor retarder layer 18 is adhered or otherwise affixed to the face of product opposite the air stream surface of layer 12 to prevent moisture from entering the insulation from the ambient environment.

FIG. 2 shows a forming section for forming the insulating layer 12, 13 which includes the optional hydrophobic agent in the binder of portion 12. Insulation layers 12 and 13 may be made in forming section 19 by melt spinning molten material, such as glass, into veils 20 of fine fibers using a plurality of fiberizing units 22 a-22 f. The veils of fibers enter a forming hood 24 where a binder, such as a phenolic resin, in an aqueous carrier (or water and binder in sequence) is sprayed onto the veils 20. In the forming hood 24, fibers are accumulated and collected as a web on a chain, belt or other conventionally-driven conveyor 26. In order to impart hydrophobicity to portion 12, at least fiberizing unit 22 f is configured to dispense binder having a hydrophobic agent incorporated therein. After the web exits the forming section 19, it is conveyed to an unillustrated conventional curing oven for compressing and curing the web to a desired thickness and density.

While in the oven, portions 12, 13 are simultaneously heated in order to cure the binder and adhere the portions to one another so as to form the homogeneous mass of product 10. Preferably, the multiplicity of layers of fibers are held together by unillustrated heated platens or the like under sufficient pressure to compress the mass of fibers in portions 12 and 13 against each other. After product 10 exits the curing oven, vapor retarder layer 18 is applied to the surface of layer 13 opposite the air steam surface.

In some embodiments, the binder used in at least portion 12 includes at least one hydrophobic agent such as silicone, oil, fluorocarbon, waxes, wax-asphalt emulsions, acrylics, other emulsions, latexes, polyvinyl acetates, etc. or the like in an effective amount sufficient to render the product water repellent and resistant to aqueous solutions containing moderate quantities of solvent regardless of the water repellency of the airstream facing layer 14. Depending upon the hydrophobic agent selected, effective amounts of hydrophobic agent may range in a ratio of about 1:200 to 1:5 hydrophobic agent to binder. In one embodiment, a commercially available hydrophobic agent suitable for these purposes is DC 347 silicone emulsion manufactured by Dow Coming Corporation of Midland, Mich. Good water repellency characteristics have been shown when this agent is present in a ratio of about 1:24 relative to phenolic resin binder. Alternative hydrophobic agents suitable for use with phenolic resin include Mulrex®, an oil emulsion marketed by the Mobil Oil Corporation of Fairfax, Va. and stock number SL 849 oil marketed by Borden Chemical, Inc. of Columbus, Ohio. Good water repellency characteristics have been shown when Borden® SL 849 oil is present in a ratio of about 1:16 relative to phenolic resin binder.

Although an example is described above in which one portion 12 of the insulating layer includes a hydrophobic agent in the binder thereof, and another portion 13 of the insulating layer may not include a hydrophobic agent in the binder thereof, other embodiments include the hydrophobic agent in the binder of the entire insulating layer 12, 13. As noted above, if the mat facing 14 provides the desired water repellence (alone or in combination with a water repellant adhesive 16), then neither portion 12 or 13 requires a hydrophobic agent.

An exemplary rotary process described above is advantageous for making a duct board product. In the case of duct liner product, a similar flame attenuated process is used. Alternatively, a duct liner product can be fabricated using a textile mat forming process, in which textile fibers in continuous strands are chopped into 2 to 5 inch lengths and formed into a mat or board by an air-laid process. A hydrophobic agent such as a silicone, fluorocarbon or wax may be added to the powdered binder used in this process.

In some embodiments, the water repellency of the duct board or tube 10 is enhanced by incorporating a hydrophobic agent into adhesive 16. In this way, liquid water or other aqueous liquids in the interior of the duct which penetrate facing 14 are repelled from entering the interior portion 12 of the insulation layer 12, 13 thereby further reducing the likelihood of microbial growth in the insulation.

Referring to FIG. 3, insulation layer 12, 13 may be made in a forming station 19 as described above, by melt spinning molten material, such as glass, into fine fibers, and spraying a binder, such as a phenolic resin binder in an aqueous carrier, onto the fibers, and collecting the fibers as a web on a conveyor. The web is then passed through a conventional curing oven 30 or other means for curing and compressing the web to a desired thickness after the web exits the forming station. Note that portion 13 is not shown in FIG. 3. For purpose of this example, it is optional, but not necessary, to have distinguishable portions 12, 13 in the insulating layer.

In some embodiments, a continuous web of facing layer 14 is dispensed from a roll 32 and is applied to one surface of insulation layer 12 prior to curing of the binder in the insulation. Prior to adhering the facing layer 14 to the insulation layer 12, an adhesive 16 is applied to either or both of the facing layer 14 and the insulation layer 12. Adhesive 16 may be continuously applied to the underside of facing layer 14 via an applicator roll 34 rotatably supported in a pan 36 or similar receptacle which contains adhesive appropriate for securely adhering layers 12,14 to one another following curing. It will be understood that adhesive 16 may be applied to either or both of layers 12, 14 by other means such as spraying or brushing.

In applying adhesive, care should be taken to minimize the amount of adhesive 16 that penetrates through the facing all the way through to the (inner) airstream surface of facing 14 and becomes deposited on that surface. Adhesive 16 on the inner surface of mat 14 may present a more wettable surface than the bare facing 14. Thus, if the airstream surface is partially or totally coated with adhesive 16, this may increase the surface tension of the surface and reduce water repellence below that of bare facing 14.

Although not limited thereto, a preferred adhesive is a phenolic resin having generally the same or similar composition as the binder that is used to bind the fibers in insulation layer 12. However, phenolic resin adhesives have limited hydrophobicity.

Accordingly, the adhesive used to attach facing 14 to insulation layer 12 may optionally include at least one hydrophobic agent such as silicone, oil, fluorocarbon, waxes or the like in an effective amount sufficient to render the product essentially impermeable to water and resistant to aqueous solutions containing moderate quantities of solvent, regardless of the water repellency of the facing 14. Effective amounts of hydrophobic agent may range in a ratio of about 1:20 to 1:200, and more preferably about 1:40, hydrophobic agent to binder. A commercially available hydrophobic agent suitable for these purposes is DC 347 silicone emulsion manufactured by Dow Corning Corporation of Midland, Mich.

The layers 12, 14 may travel at any desired synchronous speed and the applicator roll 24 may be rotated at any speed sufficient to thoroughly apply the adhesive 16 to the underside of the moving facing layer web 14. Acceptable results have been demonstrated at a moving layer speeds of about 80 feet per minute coupled with applicator roll 24 rotation speeds of about 3-20 rpm. A placement means 38 such as an idler roller or the like may be used to facilitate placement of the layer 14 on layer 12. Product 10 is then passed by an unillustrated conveyor to a curing oven 30. While in the oven, layers 12,14 are simultaneously heated in order to cure the binder and adhesive 16. Preferably, layers 12,14 are held together by unillustrated heated platens or the like under sufficient pressure to compress the facing layer 14 against the insulation layer 12. Heating the two layers under compression securely bonds the facing layer 14 to the thermal insulation layer 12. Vapor retarder layer 18 (shown in FIG. 1) may be applied to the surface of insulation layer 12 opposite facing layer 14 after the insulation board exits the curing oven. After the curing oven, the rough edges of the board may also be removed, such as with a circular saw. The duct board is then cut to length and packaged.

EXAMPLE

Samples were constructed with facing 14 made of Johns Manville 3220B and Lydall Manniglass 1886, on a fiber glass insulation board with a phenolic binder. The samples were constructed at different conveyor line speeds of 80 and 92 feet per minute (which affects the density of the insulating layer 12). In these samples, hydrophobic agents were not added to the binder of insulating layer 12, or to the adhesive 16. The results of evaluating the boards' water repellency by placing drops of water and water/alcohol solutions on the surface of the board were as set forth in Table 1. Test results for a commercially available Knauf Air Duct Board-M with Hydroshield Technology EI475 duct board are also provided for comparison. The term “OK” indicates that droplets did not penetrate the surface in the referenced period of time.

TABLE 1
JM 3220B JM 3220B Lydall 1886 Lydall 1886
Board @80 @92 @80 @92 Knauf
Sample feet/minute feet/minute feet/minute feet/minute Hydroshield
Water(100%) OK > 1 hour OK > 1 hour OK > 1 hour OK > 1 hour OK 15 min
10% OK > 1 hour OK > 1 hour OK > 1 hour OK > 1 hour OK 15 min
Isopropanol
20% OK > 1 hour OK > 1 hour OK > 1 hour OK > 1 hour OK 15 min
Isopropanol
30% OK > 1 hour OK > 1 hour OK > 1 hour OK > 1 hour Soaked
Isopropanol immediately
(<1 minute)
40% OK > 1 hour OK > 1 hour Some soaked OK > 15 Soaked
Isopropanol in <5 minutes minutes immediately
(<1 minute)
50% OK > 1 hour OK > 1 hour Some soaked Some Soaked Soaked
Isopropanol in <5 minutes in <15 immediately
minutes (<1 minute)

An extended test was conducted on the sample prepared using JM 3220B with a line speed of 80 feet/minute. The sample was placed under running tap water for over seven hours, at an angle of approximately 60 degrees from the horizontal, and water dripped from a height of 13.3 centimeters (5.25 inches). After seven hours, there was no penetration of water except for the bottom edge of the board, where water soaked in about 2.5 centimeters (1 inch) from the edge (In the sample, the mat did not wrap around the bottom edge, so the bare insulation material was exposed directly to the running/dripping water stream). A cross section of the board showed that the portion of the board directly under the drip of water appeared dry.

In an alternative embodiment, the duct board or duct liner product achieves at least an INDA 2 water repellence rating, meaning the product has sufficient water repellency to repel a mixture of 20% isopropanol and about 80% water for a minimum of five minutes using the IST 80.6-92 water repellency test method, while having a low weight water repellant mat facing 14 thereon. In one embodiment, the mat facing comprises a nonwoven fiber glass mat having weight of less than 1.1 lb/100 ft2 (53.7 g/m2), and more preferably less than 1.0 lb/100 ft2 (48.81 g/m2). In one exemplary embodiment, the nonwoven fiber glass mat is the 27# Manniglas® 1807 mat having a target weight of 0.87 lb/100 ft2 (42.3 g/m2 ) and maximum weight of 0.97 lb/100 ft2 (47.5 g/m2) available from Lydall Inc., the 23# Manniglas® 1803WHB mat having a target weight of 0.80 lb/100 ft2 (39.1 g/M2) and a maximum weight of 0.90 lb/100 ft2 (43.9 g/m2) also available from Lydall Inc. or a mat having a weight therebetween. These exemplary nonwovens include an integral water repellent. In an exemplary embodiment, the nonwoven is combined, such as by saturation, with a water repellent comprising a fluorinated polymer, such as an fluorinated acrylic, fluropolymer or flurocarbon, silicone, wax, oil, wax-asphalt emulsions, acrylics, other emulsions, latexes, polyvinyl acetates, etc. The weights reflect the combined weight of the coating and mat. In this embodiment, the desired water repellency can be achieved without the use of a water repellent added to the binder of the duct board or adhesive used to adhere the nonwoven to the duct board.

By limiting the weight of the nonwoven facing, significant cost savings can be realized while providing a cost effective, abuse resistant water repellant airstream surface for the mineral fiber duct product. Presently, the 23# Manniglas® 1803WHB mat, for example, provides roughly a cost savings proportional to the percentage difference in weight over the heavier Manniglas® 1886 black models. Additional cost savings can be realized in embodiments where no additional water repellent is added to the binder of the duct board or adhesive used to adhere the nonwoven to the duct board.

Samples were constructed with facing 14 made of the 23# Manniglas® 1803WHB mat having target weight of 39.1 g/m2, and the 27# Manniglas® 1807 mat having target weight of 0.87 lb/100 ft2 (42.3 g/m2 ) on a fiber glass insulation board with a phenolic binder. The 1803 WHB sample achieved an INDA 2.4 rating using the IST 80.6-92 water repellency test method, and the 1807 sample achieved an INDA 2.0 rating using the IST 80.6-92 water repellency test method.

Although the invention has been described in terms of exemplary embodiments, it is not limited thereto. Rather, the appended claims should be construed broadly, to include other variants and embodiments of the invention, which may be made by those skilled in the art without departing from the scope and range of equivalents of the invention.

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Classifications
U.S. Classification428/36.91, 138/149
International ClassificationF24F13/02, B32B5/26
Cooperative ClassificationY10T442/2164, Y10T442/2189, Y10T428/1352, Y10T428/131, Y10T428/1393, Y10T428/1317, Y10T428/1321, Y10T428/1362, Y10T428/139, Y10T428/1314, Y10S138/04, F24F13/0263, F24F13/0281, B32B5/26
European ClassificationF24F13/02K, B32B5/26, F24F13/02H
Legal Events
DateCodeEventDescription
Aug 11, 2004ASAssignment
Owner name: CERTAIN TEED CORPORATION, PENNSYLVANIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MANKELL, KURT O.;TOAS, MURRAY S.;MATTIX, GREG;AND OTHERS;REEL/FRAME:015682/0678;SIGNING DATES FROM 20040713 TO 20040810