Abstract:
An entangled net having a crumb dispersed therein may be used as a sound deadening material in a flooring system. The crumb may be adhered to said entangled net. The entangled net may include a first barrier layer affixed to an upper surface of said entangled net and/or a second barrier layer affixed to a lower surface of said entangled net. The crumb may be selected from the group consisting of: rubber; foam; natural elastic materials; synthetic elastic materials; fibers; and combinations thereof. The method of use and manufacture are also disclosed.

Description:
RELATED APPLICATION 
     This application claims the benefit of U.S. Provisional Application Ser. No. 62/056,657 filed Sep. 29, 2014, incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The entangled net product with crumb may be used as a sound deadening product in flooring systems. 
     BACKGROUND OF THE INVENTION 
     The transmission of sound through a flooring system is of great concern, especially in multi-family dwellings. The ability of the flooring system not to transmit sound from one living space to the next is greatly desired. 
     In many multi-family dwelling, the flooring system uses a gypsum (or cementitious) material covering over a subfloor structure. While the gypsum material has some inherent sound deadening properties, those properties are not sufficient to meet the higher standards now being sought by the building industry. 
     The industry has looked at the use of various forms of entangled net to address the sound deadening issue, see, for example, U.S. Pat. No. 7,096,630, US2006/0230699; U.S. Pat. No. 8,146,310; U.S. Pat. No. 8,544,218; and U.S. Pat. No. 8,528,286, each incorporated herein by reference. While each of these solutions have provided an advancement, the industry is still looking for greater sound deadening properties. 
     Entangled nets are known, for example see U.S. Pat. No. 7,096,630, US2006/0230699; U.S. Pat. No. 8,146,310; U.S. Pat. No. 8,544,218; and U.S. Pat. No. 8,528,286, each incorporated herein by reference. Entangled nets may be in two general forms: 1) a solid formed of a plurality of entangled fibers (filaments or continuous fibers), for example see U.S. Pat. No. 7,096,630, U.S. Pat. No. 8,146,310, and U.S. Pat. No. 8,544,218; or 2) a sheet of entangled fibers (filaments or continuous fibers) where the sheet is folded (eg, forming a sine curve in cross-section or ‘peaks and furrows’ (or ‘W’)) or dimpled (eg, cone-shaped) to create a three-dimensional solid, for example see U.S. Pat. No. 8,528,286 and U.S. Pat. No. 8,146,310. 
     Accordingly, there is a need for new sound deadening products that meet or exceed the performance of the foregoing products. 
     SUMMARY OF THE INVENTION 
     An entangled net having a crumb dispersed therein may be used as a sound deadening material in a flooring system. The crumb may be adhered to said entangled net. The entangled net may include a first barrier layer affixed to an upper surface of said entangled net and/or a second barrier layer affixed to a lower surface of said entangled net. The crumb may be selected from the group consisting of: rubber; foam; natural elastic materials; synthetic elastic materials; fibers; and combinations thereof. The method of use and manufacture are also disclosed. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
       For the purpose of illustrating the invention, there is shown in the drawings a form that is presently preferred; it being understood, however, that this invention is not limited to the precise arrangements and instrumentalities shown. 
         FIG. 1  shows an embodiment of the instant invention. 
         FIG. 2  illustrates a method of manufacturing the instant invention. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     The invention may be characterized as: an entangled net including crumb (an article of manufacture); a sound deadening product (or method for sound deadening) having an entangled net including crumb; and a method for making an entangled net including crumb. 
     Referring to the drawings, where like elements have like numerals, there is shown, in  FIG. 1 , an embodiment of the entangled net with crumb  10 . In general, the entangled net with crumb  10  includes an entangled net  12  including crumb  14 . Additionally, the invention  10  may include a first barrier layer  16  affixed on an upper surface of the entangled net  12 . Additionally, the invention  10  may include a second barrier layer  18  affixed on a lower surface of the entangled net  12 . The entangled net with crumb  10  may include both barrier layers, neither barrier layer, or just one of the barrier layers. 
     Entangled nets may be in either of two general forms: 1) a solid formed of a plurality of entangled fibers (filaments or continuous fibers), for example see U.S. Pat. No. 7,096,630, U.S. Pat. No. 8,146,310, and U.S. Pat. No. 8,544,218; or 2) a sheet of entangled fibers (filaments or continuous fibers) where the sheet is folded (eg, forming a sine curve in cross-section or ‘peaks and furrows’ (or ‘W’)) or dimpled (e.g., cone-shaped) to create a three-dimensional solid, for example see U.S. Pat. No. 8,528,286. Entangled nets are known, for example see U.S. Pat. No. 7,096,630, US2006/0230699; U.S. Pat. No. 8,146,310; U.S. Pat. No. 8,544,218; and U.S. Pat. No. 8,528,286, each incorporated herein by reference. In general, the fibers of the entangled net create an open solid (open in the sense of the interstitial spaces between the fibers). 
     The crumb  14  may be any crumb material. When the entangled net with crumb is used as a sound deadening product, the crumb should have sound deadening properties. In general, sound deadening properties refers to the ability to absorb acoustical energy. Such crumb may generally be elastic, but is not necessarily so. Examples of crumb having such sound deadening properties include: rubber (e.g., crumb and/or sponge and/or cross-linked and/or non cross-linked); foam (e.g., closed cell and/or opened cell); natural elastic materials (e.g., cork); synthetic elastic materials; fibers—any length and any diameter) (e.g., cellulosic, thermoplastic (e.g., polyolefin, amide, acrylic); and combinations thereof. The crumb may have any diameter. In one embodiment, the crumb has a diameter no greater than ⅛″ (0.125 inch). 
     The crumb may be adhered to the entangled net. Any adhesive may be used. Such adhesives include, but are not limited to: hot-melt adhesives (elastic, inelastic, tacky, nontacky), pressure-sensitive adhesives, energy activated adhesives (activated by heat, IR, etc), moisture activated adhesives, two component adhesives, and combinations thereof. In sound deadening application, any adhesive having sound deadening properties may be used; but, sound deadening properties are not necessary. Such adhesives include those mentioned above that have sound deadening properties. In some embodiments, the adhesive remains tacky, so that the tacky entangled net, when exposed, may be used to adhere the product to the subflooring to facilitate installation (ie, hold the product in place during floor installation without the need of nails or staples to hold the product in place). 
     The first barrier layer (optional) may be any sheet or film material. The first barrier may, for example, be used to: prevent the ingress of foreign materials into the product during use, and/or the loss of crumb during manufacture. When used in flooring systems, such as the cementitious flooring systems, the first barrier layer may be any material that is at least water impermeable, but may be water impermeable and moisture permeable. Such materials may include nonwovens (for example spunbonded, meltblown, and or spunmelt nonwovens). The first barrier layer is adhered to the entangled net is any conventional fashion. 
     The second barrier layer (optional) may be any sheet or film material. The second barrier layer may, for example, be used to: prevent the loss of crumb after manufacture; and/or as a release layer, so when the product is wound (product typically sold as roll goods), it does not adhere to itself; and/or as a sound deadening layer; and/or a peelable layer so that the tacky entangled net may be exposed to facilitate installation. The second barrier layer may be a foam or nonwoven or fabric (woven or knitted) or a film (perforated or nonperforated), or combinations thereof. 
     In  FIG. 2 , a method of manufacturing the invention is illustrated. The entangled net  12  may be unwound  22  (or taken directly from its manufacture) to a station  28  where crumb  14  is added. The adhesive may be added to the entangled net before  26  crumb addition, or after  32  crumb addition, or before and after crumb addition. The use of a vacuum station  30  may be used to facilitate crumb distribution within the entangled net  12 . The first barrier layer  16  may be added  24  to the entangled net  12  before crumb addition (note in this embodiment, the first battier layer is located on the bottom surface of the entangled net). The second barrier layer may be added  34  to the entangled net after crumb addition (note in this embodiment, the second battier layer is located on the upper surface of the entangled net). After formation of the invention, the product may be wound-up  36  to form a roll good. Alternatively, the entangled net  12  and the first barrier layer  16  may be made before the addition  26  of the crumb. 
     In use, the entangled net with crumb is installed on top of the subfloor of the building (e.g., a multi-family dwelling). If the barrier layers are used, the first barrier layer faces up (e.g., toward the cementitious or gypsum layer), and the second layer (or bottom surface of the entangled net with crumb) faces down (e.g., toward the subfloor). All or a portion of the second layer may be removed (or peeled back), so that the adhesive may be used to secure the entangled net with crumb to the subfloor. After installation of the entangled net with crumb over the subfloor, the cementitious or gypsum layer may be poured over the entangled net with crumb. 
     The present invention may be embodied in other forms without departing from the spirit and the essential attributes thereof, and, accordingly, reference should be made to the appended claims, rather than to the foregoing specification, as indicating the scope of the invention.