Patent Publication Number: US-7718037-B2

Title: Creping foil for redirecting dust

Description:
FIELD OF THE INVENTION 
   The present invention relates generally to the reduction of dust in papermaking processes through the disruption of the flow of dust laden air in the boundary layer near the surface of a paper web. More specifically, the present invention relates to a creping foil having pipes for the propulsion of fluid integrally mounted thereon. 
   BACKGROUND OF THE INVENTION 
   Dust can be generated when a paper web is separated from a Yankee dryer by a creping blade. Much of the dust is carried along the web in a boundary layer of air which forms due to the rapid movement of the web away from the Yankee dryer. The dust in the boundary layer oftentimes spreads into the areas around the paper machine or other equipment and may cause unwanted contamination of those parts of the paper machine. 
   A number of problems may be related to the production, and presence, of dust in a paper machine. For example, during printing operations unwanted dust can reduce the aesthetic quality of the final product by mixing with, or getting caught in, printing ink. Relatively high amounts of dust may also be a source of physical irritation for any person who may be in close enough proximity to inhale it. Further, dust may present a fire hazard, can be the cause of increased maintenance costs, premature equipment wear and sheet breaks. 
   Without being limited by theory, it is thought that dust can be formed from paper fibers which can be liberated from the paper web as a paper web impacts the surface of a creping blade. Upon liberation from the paper web, the dust may be drawn into the fluid (air) boundary layer traveling along the surface of the moving paper web. Without wishing to be limited by theory, it is thought that that approximately 90% of dust that is formed at the creping blade is drawn into the above-mentioned boundary layer. 
   The prior art methods of removing dust that results from the creping of paper off a Yankee dryer include the use of large vacuums or high horsepower fan-driven dust extraction systems that collect and/or separate dust from the surrounding air. However, without being limited by theory, it is thought that the forces exerted onto a paper web by fans or vacuums may cause loss of sheet control or tearing of the paper web. 
   Thus, there exists the need for an efficient device and method to control the migration of dust in a papermaking process that provides a minimal level of disruption to the papermaking process and in particular, to the paper web. 
   SUMMARY OF THE INVENTION 
   In one embodiment the present invention relates to a creping foil comprising: a machine direction, cross machine direction, and Z-direction normal to a plane formed by machine direction and cross machine directions. The creping foil further comprises a front face, back face, and bottom side. The front face comprises one or more top conduits having one or more upper pipes integrally mounted therein; the one or more upper pipes are rotatable about an axis in the cross machine direction and have one or more upper diameter holes. The bottom side comprises one or more bottom conduits having one or more lower pipes integrally mounted therein. The one or more lower pipes are rotatable about an axis in the cross machine direction and have one or more lower diameter holes. 
   In another embodiment the present invention relates to a creping foil comprising: a machine direction, cross machine direction, and Z-direction normal to a plane formed by machine direction and cross machine directions. The creping foil further comprises a front face, back face, bottom side, and two or more side faces. The front face comprises one or more top conduits having one or more upper pipes integrally mounted therein; the one or more upper pipes are rotatable about an axis in the cross machine direction and have one or more upper diameter holes. The bottom side comprises one or more bottom conduits having one or more lower pipes integrally mounted therein. The one or more lower pipes are rotatable about an axis in the cross machine direction and have one or more lower diameter holes. One or more of the side faces comprises one or more creping foil pivots. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     While the specification concludes with claims that particularly point out and distinctly claim the present invention, it is believed that the present invention will be understood better from the following description of embodiments, taken in conjunction with the accompanying drawings, in which like reference numerals identify identical elements. 
     Without intending to limit the invention, embodiments are described in more detail below: 
       FIG. 1  is a schematic side view of an exemplary embodiment of a papermaking machine. 
       FIG. 2A  is a perspective view of an exemplary embodiment of the present invention creping foil. 
       FIG. 2B  is a cross-sectional view of an exemplary embodiment of the present invention creping foil of  FIG. 2A  taken along line  2 B- 2 B. 
       FIG. 2C  is a cross-sectional view of an exemplary embodiment of the present invention creping foil of  FIG. 2A  taken along line  2 C- 2 C. 
       FIG. 3  is a schematic side view of an exemplary embodiment of the present invention creping foil as it may be used in the drying section of an exemplary papermaking machine. 
       FIG. 4  is a schematic side view of an exemplary embodiment of the present invention creping foil as it may be used in the drying section of an exemplary papermaking machine. 
       FIG. 5  is a schematic side view of an exemplary embodiment of the present invention creping foil. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Definitions 
   “Doctor blade” or “blade” as used herein refers to a blade that is disposed adjacent to a piece of equipment so that the doctor blade can remove a material that may be disposed on the piece of equipment. Doctor blades are commonly used in many different industries for many different purposes. Examples of materials include, but are not limited to: tissue webs, paper webs, glue, residual buildup, pitch, and combinations thereof. Examples of equipment include, but are not limited to: drums, plates, Yankee dryers, rollers, and combinations thereof. Exemplary industries that use doctor blades include, but are not limited to: papermaking, nonwoven manufacture, tobacco, and printing, coating and adhesives processes. 
   “Creping blade” or “creper blade” as used herein, refers to a doctor blade used in the papermaking industry to remove a paper web from a drum and to provide some “crepe” or fold to the web. Creping blades can have the dual function of removing a web from a piece of equipment, such as, for example a Yankee dryer, and providing the web with crepe. 
   “Creping foil” or “Creping blade foil” or “creper blade foil” or “creper foil” or “foil” as used herein, refers to a web-support structure that may be positioned anywhere in the dry end of a papermaking machine in which mechanical action is performed on a paper web. In one embodiment, the creping foil may be positioned in relatively close proximity to a creping blade in a papermaking machine. In one embodiment, the creping foil can serve as a means to improve sheet control as a paper web leaves the Yankee dryer after it contacts with the creping blade. In another embodiment, the creping foil disrupts the dust-containing boundary layer that forms around the paper web as it leaves the creping blade. In one embodiment, the creping foil is positioned under the paper web during operation. In another embodiment, the creping foil is positioned above the paper web during operation. 
   “Fluid” as used herein, refers to any matter having particles that may continually deform or flow under an applied shear stress regardless of the magnitude of the applied stress. 
   “Yankee dryer” or “Yankee roll” or “Yankee” as used herein, refers to a drum for drying paper webs that may not be strong enough to endure numerous felt transfers. The Yankee dryer dries paper as it comes off the wet end of the papermaking machine by pressing one side of the paper web against a cylinder that is typically heated with steam. In some embodiments, the web is glued to the Yankee to keep the web under control. In some embodiments the Yankee dryer may be a cylindrical metal drum having a diameter of from about 3.5 to about 5.5 meters. While on the Yankee dryer, the paper web goes from about 30% dryness to about 95% dryness. 
   As used herein, “Machine Direction” or “MD” means the direction parallel to the flow of the fibrous structure or paper web through a papermaking machine and/or product manufacturing equipment. 
   As used herein, “Cross Machine Direction” or “CD” means the direction perpendicular to, and coplanar with, the machine direction of the paper web and/or fibrous structure product comprising the fibrous structure. 
   As used herein, “Z-direction” means the direction normal to a plane formed by machine direction and cross machine directions. 
   “Sheet control” as used herein, refers to the lack of vibrations, turbulence, edge flipping, flutter, or weaving of the web that result in a loss of control at higher speeds. 
   Paper Web 
   Paper making fibers useful in the present invention include cellulosic fibers commonly known as wood pulp fibers. Applicable wood pulps include chemical pulps, such as Kraft, sulfite and sulfate pulps; mechanical pulps including groundwood, thermo-mechanical pulp; chemical-thermo-mechanical pulp; chemically modified pulps, and the like. Chemical pulps, however, may be preferred in tissue towel embodiments since they are known to those of skill in the art to impart a superior tactile experience and softness to tissue sheets made therefrom. Pulps derived from deciduous trees (hardwood) and/or coniferous trees (softwood) can be utilized herein. 
   Such hardwood and softwood fibers can be blended or deposited in layers to provide a stratified paper web. Exemplary layering embodiments and processes of layering are disclosed in U.S. Pat. Nos. 3,994,771 and 4,300,981. Additionally, fibers derived from non-wood pulp such as cotton linters, bagesse, and the like, can be used. Additionally, fibers derived from recycled paper, which may contain any or all of the pulp categories listed above, as well as other non-fibrous materials such as fillers and adhesives used to manufacture the original paper product may be used in the present web. In addition, fibers and/or filaments made from polymers, specifically hydroxyl polymers, may be used in the present invention. Non-limiting examples of suitable hydroxyl polymers include polyvinyl alcohol, starch, starch derivatives, chitosan, chitosan derivatives, cellulose derivatives, gums, arabinans, galactans, and combinations thereof. Additionally, other synthetic fibers such as rayon, lyocel, polyester, polyethylene, and polypropylene fibers can be used within the scope of the present invention. Further, such fibers may be latex bonded. Other materials are also intended to be within the scope of the present invention as long as they do not interfere or counter act any advantage presented by the instant invention. 
   Synthetic fibers useful herein include any material, such as, but not limited to, those selected from the group consisting of polyesters, polypropylenes, polyethylenes, polyethers, polyamides, polyhydroxyalkanoates, polysaccharides, and combinations thereof. The synthetic fiber may comprise a polymer. The polymer may be any material, such as, but not limited to, those materials selected from the group consisting of polyesters, polyamides, polyhydroxyalkanoates, polysaccharides and combinations thereof. More specifically, the material of the polymer segment may be selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate), poly(1,4-cyclohexylenedimethylene terephthalate), isophthalic acid copolymers (e.g., terephthalate cyclohexylene-dimethylene isophthalate copolymer), ethylene glycol copolymers (e.g., ethylene terephthalate cyclohexylene-dimethylene copolymer), polycaprolactone, poly(hydroxyl ether ester), poly(hydroxyl ether amide), polyesteramide, poly(lactic acid), polyhydroxybutyrate, and combinations thereof. 
   Further, the synthetic fibers can be a single component (i.e., single synthetic material or mixture makes up entire fiber), bi-component (i.e., the fiber is divided into regions, the regions including two or more different synthetic materials or mixtures thereof and may include co-extruded fibers) and combinations thereof. It is also possible to use bicomponent fibers, or simply bicomponent or sheath polymers. Nonlimiting examples suitable bicomponent fibers are fibers made of copolymers of polyester (polyethylene terephthalate)/polyester (polyethylene terephthalate) (otherwise known as “CoPET/PET” fibers), which are commercially available from Fiber Innovation Technology, Inc., Johnson City, Tenn. These bicomponent fibers can be used as a component fiber of the structure, and/or they may be present to act as a binder for the other fibers present. Any or all of the synthetic fibers may be treated before, during, or after the process of the present invention to change any desired properties of the fibers. For example, in certain embodiments, it may be desirable to treat the synthetic fibers before or during the papermaking process to make them more hydrophilic, more wettable, etc. 
   The paper web may comprise a tissue-towel paper product known in the industry. Embodiment of these substrates may be made according U.S. Pat. Nos.: 4,191,609, 4,300,981, 4,191,609, 4,514,345, 4,528,239, 4,529,480, 4,637,859, 5,245,025, 5,275,700, 5,328,565, 5,334,289, 5,364,504, 5,527,428, 5,556,509, 5,628,876, 5,629,052, 5,637,194, and 5,411,636; EP 677612; and U.S. Patent App. No. 2004/0192136A1. 
   The paper web may be manufactured via a wet-laid making process where the resultant paper web may be comprised of fibrous structure selected from the group consisting of: through-air-dried fibrous structure plies, differential density fibrous structure plies, wet laid fibrous structure plies, air laid fibrous structure plies, conventional fibrous structure plies, and combinations thereof. 
   Optionally, the paper web may be foreshortened by creping or by wet microcontraction. Creping and/or wet microcontraction are disclosed in U.S. Pat. Nos.: 6,048,938, 5,942,085, 5,865,950, 4,440,597, 4,191,756, and 6,187,138. 
   The substrate which comprises the paper web may be cellulosic, non-cellulosic, or a combination of both. The substrate may be conventionally dried using one or more press felts or through-air dried. If the substrate which comprises the paper web is conventionally dried, it may be conventionally dried using a felt which applies a pattern to the paper as taught by commonly assigned U.S. Pat. No. 5,556,509 and PCT Application WO 96/00812. The substrate which comprises the paper web may also be through air dried. A suitable through air dried substrate may be made according to commonly assigned U.S. Pat. No. 4,191,609. 
   In one embodiment, the substrate which comprises the paper web may be through air dried on a belt having a patterned framework. The belt according to the present invention may be made according to any of commonly assigned U.S. Pat. Nos. 4,637,859, 4,514,345, 5,328,565, and 5,334,289. 
   Papermaking Machine 
     FIG. 1  shows a schematic view of an exemplary papermaking machine  21  in which the present invention may be used. The papermaking machine  21  comprises transfer zone  20  as described herein and, additionally: a forming section  41 , an intermediate carrier section  42 , a pre-dryer/imprinting section  43 , a drying/creping section  44 , a calendar assembly  45 , and reel  46 . 
   The forming section  41  of the papermaking machine  21  comprises a headbox  50 ; a loop of fine mesh backing wire or fabric  51  which is looped about a vacuum breast roll  52 , over vacuum box  70 , about rolls  55  through  59 , and under showers  60 . Intermediate rolls  56  and  57 , backing wire/fabric  51  is deflected from a straight run by a separation roll  62 . Biasing means not shown are provided for moving roll  58  as indicated by the adjacent arrow to maintain fabric/wire  51  in a slack obviating tensioned state. 
   The intermediate carrier section  42  comprises a loop of forming and carrier fabric  26  which is looped about rolls  62  through  69  and about a portion of roll  56 . The forming and carrier fabric  26  also passes over vacuum boxes  70  and  53 , and transfer head  25 ; and under showers  71 . Biasing means are also provided to move roll  65  to obviate slack in fabric  26 . Juxtaposed portions of fabrics  51  and  26  extend about an arcuate portion of roll  56 , across vacuum box  70 , and separate after passing over an arcuate portion of separation roll  62 . In one embodiment, forming and carrier fabric  26  is identical to backing wire/fabric  51  except for the lengths. 
   The pre-dryer/imprinting section  43  of papermaking machine  21  comprises a loop of transfer fabric or imprinting fabric  28 . Transfer/imprinting fabric  28  is looped about rolls  77  through  86 ; passes across transfer head  25  and vacuum box  29 ; through a blow-through pre-dryer  88 ; and under showers  89 . Additionally, not shown is a biasing mechanism for biasing roll  79  towards the adjacent Yankee dryer  91  with a predetermined force per lineal inch to effect imprinting the knuckle pattern of fabric  28  in paper web  30  in the manner of, and for the purpose disclosed in, U.S. Pat. No. 3,301,746. Not shown is a biasing mechanism for moving roll  85  as indicated by the adjacent arrow to obviate slack in fabric  28 . 
   The drying/creping section  44  of papermaking machine  21  comprises Yankee dryer  91 , adhesive applicator  92 , creping blade  93 , creper foil  700 , reel roll  94 , and dust collection device  99 . 
   V 1  is the velocity of the papermaking fabrics  51  and  26 . V 2  is the velocity about the transfer/printing rolls  77  through  86 . V 3  is the velocity of the calendar assembly  45 . V 4  is the reel velocity of the reel roll  94 . 
   Creping Foil in a Papermaking Machine 
   The use of a foil or other web support devices positioned adjacent to a Yankee dryer above a creping blade is known in the art. An example of a foil being used to stabilize the paper web as it leaves the creping blade is described in U.S. Pat. No. 5,891,309. It should be noted that the use of a creping foil as described herein is not limited to use with a Yankee dryer, but the creping foil can be used anywhere in the dry end of the papermaking process, particularly in any area where there is some mechanical trauma exerted onto the paper web. 
     FIG. 2A  is a nonlimiting embodiment of a creping foil  700  of the present invention. The creping foil  700  comprises a front face  730  and a back face  735 . The front face  730  and back face  735  are spaced a distance T apart (thickness) and, in one embodiment, can be separated by two or more side faces  740 . In one embodiment T is from about 1 inch (about 2.54 cm) to about 10 (about 25.4 cm) inches. In another embodiment T is from about 2 inches (about 5.08 cm) to about 3 inches (about 7.62 cm). In one embodiment, the creping foil  700  has a height H of from about 8″ (about 20.32 cm) to about 20″ (about 50.8 cm). In another embodiment H is from about 10″ (about 25.4 cm) to about 16″ (about 40.64 cm). In one embodiment, the creping foil  700  has a width W of from about 100″ (about 254 cm) to about 360″ (about 914.4 cm). In another embodiment W is from about 140″ (about 355.6 cm) to about 300″ (about 762 cm). 
   The creping foil  700  further comprises a top edge  713 , top side  770 , and bottom side  720 . In one embodiment, the creping foil  700  further comprises an apex  712 , wherein the apex  712  is defined the surface of creping foil  700  that connects the highest points (in the Z-direction) of the opposing side faces  714  of the creper foil. In some embodiments, the apex  712  is the same as the top edge  713 . In one embodiment, the creping foil  700  further comprises one or more top conduits  710  that can be located on the front face  730  of the creping foil  700 . In another embodiment, the creping foil  700  further comprises one or more bottom conduits  715  that can be located on the bottom side  720  of the creping foil  700 . In one embodiment the creping foil  700  further comprises one or more upper pipes  714  that can be integrally mounted in a top conduit  710 . In one embodiment, the upper pipe  714  comprises one or more openings, or upper diameter holes  711 , for transport of a fluid through an upper pipe  714  into through an upper diameter hole  711 . In one embodiment the creping foil  700  comprises one or more lower pipes  717  that can be integrally mounted in the interior of a lower conduit  715 . In one embodiment, the lower pipe  717  comprises one or more openings, or lower diameter holes  716 , for transport of a fluid through a lower pipe  717 . In some embodiments, the upper pipe  714  and/or lower pipe  717  can be rotated about axes in the cross-machine direction such that the upper diameter holes  711  and lower diameter holes  716  can face at any angle. In one embodiment, there is only one upper diameter hole  711  and/or lower diameter hole  716  which can be a continuous line in the cross machine direction. In this embodiment the width of the hole is from about 0.005″ (about 0.0127 cm) to about 0.5″ (about 1.27 cm). In another embodiment, the upper diameter holes  711  and/or lower diameter holes  716  are circular and have a diameter of from about 0.005″ (about 0.0127 cm) to about 0.5″ (about 1.27 cm). In one embodiment, the upper diameter holes  711  and/or lower diameter holes  716  can be spaced a distance of from about ⅛″ to about 4″ apart. The upper diameter holes  711  and/or lower diameter holes  716  can be any shape and can have any spacing. Nonlimiting examples of fluid that can be used as a momentum barrier can be selected from the group consisting of: air, water, nitrogen gas, inert gases, and combinations thereof. 
     FIG. 2B  is a cross-sectional view of the creping foil  700  of  FIG. 2A  taken along line  2 B- 2 B. In one embodiment the creping foil  700  has a radius of curvature R at the upper portion of the foil  700  near the apex  712 . In an embodiment the center of the top conduit  710  is an upper vertical distance L 1  from the apex  712  of the creping foil  700  to the center point of the top conduit  710  is from about 1″ (about 2.54 cm) to about 5″ (about 12.7 cm). In another embodiment, L 1  is from about 2″ (about 5.08 cm) to about 4″ (about 10.16 cm). In one embodiment, the side face  714  of a creping foil  700  has a radius of curvature R of from about 200 inches (about 508 cm) to about infinity (a straight line). In another embodiment R is from about 275 inches (about 698.5 cm) to about 350 inches (about 889 cm). The one or more upper pipes  714  may be integrally mounted in the upper conduit  710  such that an upper pipe  714  may protrude a distance P 1  out of the plane of the front face  730  in the machine direction. In one embodiment P 1  is from about 1/16″ (about 0.15875 cm) to about ½″ (about 1.27 cm). Similarly, the one or more lower pipes  717  may be integrally mounted in the lower conduit  715  may protrude a distance P 2  out of the plane of the front face  730  in the machine direction. In one embodiment P 1  is from about 1/32″ (about 0.079375 cm) to about ¼″ (about 0.635 cm). 
   The creping foil  700  of the present invention can be made from any material or materials suitable for the particular purpose of the creper foil, whether the material(s) is now known or later becomes known. For example, a creper foil may be made from a material selected from the group consisting of: stainless steel, carbon steel, alloy metals, aluminum, aluminum alloys, composite materials, plastic, fiberglass, epoxy based, multi-bonded materials, carbon fibers, woven and/or bonded materials, cured and/or baked materials, plastics, wood, and combinations thereof. 
   As shown in the exemplary embodiment of  FIG. 2B , one or more upper pipes  714  and one or more lower pipes  717  can be integrally mounted inside one or more upper conduits  710  or one or more lower conduits  715  (respectively). Fluid may be passed through the upper pipes  714  and/or lower pipes  717  and released through upper diameter holes  711  and/or lower diameter holes  716  (respectively). The fluid serves to disrupt the boundary layer that can be formed along the surface of the paper web  30  (shown in  FIGS. 3-4 .) In one embodiment the upper pipe  714  and/or lower pipe  717  comprises a tube mounted in the cross direction inside the upper conduit  710 . In an embodiment, an upper pipe  714  and/or lower pipe  717  has a diameter d 1  and/or d 2  (respectively) of from about ¼ inches (about 0.635 cm) to about 2 inches (about 5.08 cm). In another embodiment d 1  and/or d 2  is from about ½ inches (about 1.27 cm) to about 1 inch (about 2.54 cm). 
     FIG. 2C  is a view of the cross-sectional view of the creping foil  700  of  FIG. 2A  taken along line  2 C- 2 C. In one embodiment, the upper pipe  714  may be rotated about the cross machine direction such that the flow of fluid from the upper diameter holes  711  can be directed at an angle α. The angle α is measured from the surface of the front face  730  of the creping foil  700 . The line measuring α=0 is a line that is perpendicular to the front face  730  of the creping foil  700 . In an embodiment α is from about 80 degrees to about −80 degrees. In another embodiment α is from about from about 45 degrees to about −45 degrees. In an embodiment air is the fluid used in the upper pipe  714 . In one embodiment, the lower pipe  717  may be rotated about the cross machine direction such that the flow of fluid from the lower diameter holes  716  can be directed at an angle β. The line measuring β=0 is a line that is perpendicular to the bottom side  720  of the creping foil  700 . In an embodiment β is from about 80 degrees to about −80 degrees. In another embodiment β is from about from about 45 degrees to about −45 degrees. In some embodiments, air or water may be the fluid used in the lower pipe  717 . In another embodiment a fan driven air supply provides the fluid used in the lower pipe  717 . In one embodiment, the dust may be ultimately redirected to a any collection device or area such as, but not limited to: repulper, waste storage container, dust collection vessel, the like, and combinations thereof. In another embodiment the dust can be simply redirected to a floor or any other area/structure below the creping foil  700  where it may be collected periodically. 
   Creping Foil as Arranged in a Paper Machine 
     FIG. 3  shows an expanded view of an exemplary embodiment of the creping section  44  of the papermaking machine  21  as shown in  FIG. 1 . In one embodiment the creping foil  700  is positioned such that it creates a tight barrier to a boundary layer of dust laden air that forms at the point of mechanical trauma  600  between the Yankee dryer  91  and the creping blade  93  on the paper web  30 . S represents a straight line from the tip of the creping blade  93  to the intake point  810  of the reel roll  94 . Because the diameter of the reel roll  94  (and therefore the intake point  810 ) increases as more of the paper web  30  is wound up, the direction of S changes with time. As used herein, S represents a “perfect” sheet path and a sheet traveling along S would be traveling at a height of  0  above or below the sheet path. In one embodiment the creping foil  700  is positioned such that the apex  712  of the creping foil  700  is a height of from about 0 to about ½″ above S, thereby causing the paper web  30  to follow a path above S. In another embodiment, the creping foil  700  is positioned such that the apex  712  is a height of from about ⅛″ to about ¼″ above S. In one embodiment the creping foil  700  is positioned such that the apex  712  of the creping foil  700  is a distance of from about 2″ to about 0″ below S. In another embodiment, the creping foil  700  is positioned such that the apex  712  of the creping foil  700  is a height of from about 3/2″ to about ¼″ below S. In another embodiment, the creping foil  700  is positioned such that the apex  712  of the creping foil  700  is a height of from about 1″ to about ½″ below S. The creping foil  700  may be raised and/or lowered and/or pivoted by any means known in the art to achieve the change in distance above or below S as described above. The distance above or below S is measured normal to S. 
   In one embodiment, the creping foil  700  can be mounted from about 2 inches (about 5.08 cm) to about 10 inches (about 25.4 cm) in the machine direction away from the creping blade  93 . In another embodiment, the creping foil  700  can be mounted from about 3 inches (about 7.62 cm) to about 8 inches (about 20.32 cm) in the machine direction away from the creping blade  93  to disrupt the flow of the boundary layer of air that forms around the web  30  after reaching the point of mechanical trauma  600  on the paper web  30 . Without being limited by theory, it is thought that dust released from the point of mechanical trauma  600  on the paper web  30  is most dense when it is initially liberated at the creping blade  93  and is less dense as the distance from the creping blade  93  increases. 
     FIG. 4  shows an exemplary embodiment of the creping section  44  as shown in  FIG. 1 . In one embodiment the creping foil  700  is located after the Yankee dryer  91  and creping blade  93  and below the paper web  30 . In one embodiment, a paper web  30  is creped from the surface of the Yankee dryer  91  and passes over the creping foil  700 . In the exemplary embodiment the creping foil  700  further comprises one or more creping foil pivots  750  such that the creping foil can be rotated about the creping foil pivot  750 . In one embodiment the pivot  750  can be situated anywhere on the a side face  740  of the creping foil  700  such that the pivot can be used as an axis of rotation for the creping foil  700  so that the angle at which the creping foil  700  contacts the paper web  30  can be changed. Without wishing to be limited by theory, it is thought that the angle at which the creping foil  700  contacts the paper web  30  has an effect on the sheet control of the paper web  30  as it is thought that by rotating the creping foil  700  about the creping foil pivot  750 , it is possible to select which surface of the creping foil  700  interacts with the paper web  30 , thereby changing the level of sheet control and amount of dust that is reduced. In one embodiment, the creping foil  700  is rotated about the creping foil pivot  750  such that the apex  712  of the creping foil  700  is in front of the creping foil pivot  750  in the machine direction. In a different embodiment, the creping foil  700  is rotated about the creping foil pivot  750  such that the apex  712  is behind the creping foil pivot  750  in the machine direction. 
     FIG. 5  shows an exemplary embodiment of a creping foil  700  of the present invention wherein the creping foil  700  has a creping foil pivot  750  on each edge in the cross machine direction. In one embodiment one pivot  750  may be raised or lowered independently of the other creping foil pivot  750  such that the creping foil  700  is no longer parallel in the cross machine direction. Any means known in the art can be used to raise or lower the creping foil pivots  750 . In one embodiment the creping foil  700  further comprises one or more arms  760 , wherein each arm has a proximal end and a distal end. In one embodiment the creping foil pivots  750  are attached to the proximal end of the one or more arms  760  such that the creping foil  700 . Each arm may further comprise one or more arm pivots  765  attached to the proximal end of each arm  760 . The arm  760  is rotatable about the arm pivot  765  thus allowing the creping foil  700  to be raised or lowered. 
   Test Methods 
   Laboratory Conditions: 
   All conditioning and testing is performed under TAPPI standard conditions 50.0%±2.0% R.H. and 23.0±1.0° C. (T204 om-88). All samples are conditioned for a minimum of 2 hours before testing. 
   EXAMPLE 
   Papermaking Machine Having a Creping Foil 
   A papermaking machine of the general configuration shown in  FIG. 1  and designated therein as papermaking machine  100  is run under the following conditions in accordance with the present invention to paper products, such as the Charmin™ product made by the Procter &amp; Gamble Company (Cincinnati, Ohio). The furnish comprises sixty-five percent (65%) northern softwood kraft (NSK) (i.e., long papermaking fibers) and thirty-five percent (35%) chemithermal mechanical pulp. A strength additive, Kymene™ 557H, is added to the furnish at a rate of about 20 pounds per ton (about 10 gms/kg). Kymene is a registered trademark of Hercules Inc, of Wilmington, Del. Polyvinyl alcohol creping adhesive is used and an impact angle I of about 110 degrees is maintained. A fiber consistency of about 20% is maintained at the couch roll and a before-pre-dryer (hereinafter BPD) fiber consistency of about 25% is maintained. During the run, a constant velocity V 1  of about 680 feet per minute (about 207.264 meters per minute) is maintained for the papermaking fabrics  51  and  26 ; a constant reel velocity V 4  of about 575 feet per minute (about 175.26 meters per minute) is maintained; and V 2  is about 550 feet per minute (about 167.64 meters per minute), and V 3  is about 560 (about 170.688 meters per minute). The paper web is dried in the pre-dryer  88  to a fiber consistency of from about 70% to about 60% after the pre-dryer; and further dried on the Yankee dryer  91  to from about 96% to about 98%. The resulting paper has a basis weight of from about 14 to about 18 pounds per three-thousand square feet (from about 23 to about 29 grams per square meter), and a dry caliper of from about 20 mils to about 35 mils. 
   After being creped off the Yankee dryer  91  by the creping blade  93 , the paper web  30  passes over a creping foil  700  and continues on to the reel roll  94 . The creping foil  700  is located about 3 inches in the machine direction from the creping blade  93 . The creping foil  700  has a width of about 234 inches (about 594.36 cm), height of about 10 inches (about 25.4 cm), and a thickness of about 3 inches (about 7.62 cm). The creping foil  700  has a radius of curvature of about 300 inches (about 762 cm). Compressed air is supplied to the upper pipe  714  of the creping foil  700  at a pressure of 8 psig (about 0.544368 atm). Note that gauge pressure differs from the absolute pressure (i.e. actual pressure) as absolute pressure is equal to the gauge pressure plus atmospheric pressure. Air is provided to the lower pipe  716  of the creping foil  700  at a gauge pressure of about 40 inches of water (about 0.098333 atm) with a flow rate of 350 cubic feet per minute (about 9.91 cubic meters per minute). 
   A dust collection device  99  is located about 100 inches (about 2.54 meters) below the portion of the paper web  30  and about ½ inch (about 1.27 cm) behind the creping blade  93  in the machine direction. The dust collection device  99  draws air from under the paper web  30  using an exhaust fan that draws air at 25000 cubic feet per minute (about 707.921165 cubic meters per minute). The dust collection device  99  has an intake slot of approximately 2.5 inches (about 6.35 cm) in the machine direction and about 220 inches (about 558.8 cm) in the cross machine direction. The intake slot is connected to the fan and a duct which routes the collected air stream through a wet cyclonic separator to remove the dust collected from the air for weighing. The amount of dust collected is weighed after 2 hours of running continuously. 
   Three runs using the identical conditions were performed and the mean weight is reported. 
   Dust Collected—8.58 lb/hr 
   Papermaking Machine without a Creping Foil 
   A paper web is made in accordance with the prior example except that no creping foil is used in the creping section of the papermaking machine 
   Three runs using the identical conditions were performed and the mean weight is reported. 
   Dust Collected w/o Creper Foil—4.99 lb/hr 
   All publications, patent applications, and issued patents mentioned herein are hereby incorporated in their entirety by reference. Citation of any reference is not an admission regarding any determination as to its availability as prior art to the claimed invention. 
   Herein, “comprising” means the term “comprising” and can include “consisting of” and “consisting essentially of.” 
   The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical dimensions or values recited. Instead, unless otherwise specified, each such dimension or value is intended to mean both the recited dimension or value and a functionally equivalent range surrounding that dimension or value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”. 
   While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.