Brush having multiple differently-shaped filaments

Abstract

Brushes may be made by extruding filaments having at least two different cross-sections using a single extrusion mold. The filaments may have different cross sectional shapes and/or sizes. After extrusion, the filaments may be coupled to a brush, such as a cosmetic brush for applying a cosmetic product.

What is claimed is: 
     
         1 . A brush comprising:
 a handle; and   a plurality of multiple differently-shaped filaments coupled to the handle, the plurality of multiple differently-shaped filaments comprising filaments having filaments having a first cross-section and filaments having a second cross section, the second cross section being different from the first cross section.   
     
     
         2 . A brush according to  claim 1 , wherein the at least two shapes of the multiple differently-shaped filaments include filaments having at least two of a circular cross-section shape, a quadrilateral cross-section shape, a triangular cross-section shape, a cross-shaped cross-section, an oval-shaped cross-section, a square-shaped cross-section, a rectangular-shaped cross-section, a pentagon-shaped cross section, a hexagonal-shaped cross-section, or an octagonal-shaped cross-section. 
     
     
         3 . A brush according to  claim 1 , the plurality of filaments being spaced apart such that voids are present between the filaments of the plurality of filaments. 
     
     
         4 . A brush according to  claim 3 , wherein the voids between the multiple differently-shaped filaments facilitate product uptake between the multiple differently-shaped filaments. 
     
     
         5 . A brush according to  claim 1 , wherein the multiple differently-shaped filaments comprise a cross-sectional area of at least about 0.05 mm and at most about 0.25 mm. 
     
     
         6 . A brush according to  claim 1 , wherein filaments of the plurality of multiple differently-shaped filaments having a different cross-sectional area include filaments of the plurality of multiple differently-shaped filaments having a same cross-section shape. 
     
     
         7 . A brush according to  claim 1 , wherein at least a first of the at least two shapes of the multiple differently-shaped filaments comprises a cross-sectional area of between about 0.05 mm and about 0.10 mm and at least a second of the at least two shapes of the multiple differently-shaped filaments comprises a cross-sectional area at least about 0.15 mm and at most about 0.25 mm. 
     
     
         8 . A brush according to  claim 1 , wherein the multiple differently-shaped filaments comprise at least one of Polybutylene Terephthalate (PBT) and/or Polyethylene Terephthalate (PET). 
     
     
         9 . A brush according to  claim 1 , wherein the multiple differently-shaped filaments comprise magnetic filaments. 
     
     
         10 . A brush according to  claim 1 , wherein the multiple differently-shaped filaments comprise color-changing filaments. 
     
     
         11 . A method comprising:
 preparing a resin for extrusion; and   extruding the prepared resin through a mold body having holes of multiple different shapes to obtain multiple differently-shaped filaments.   
     
     
         12 . A method according to  claim 11 , wherein the resin for extrusion comprises Polybutylene Terephthalate (PBT). 
     
     
         13 . A method according to  claim 11 , wherein the at least two shapes of the multiple differently-shaped filaments include filaments having a circular cross-section shape, a quadrilateral cross-section shape, a triangular cross-section shape, a cross-shaped cross-section, an oval-shaped cross-section, a square-shaped cross-section, a rectangular-shaped cross-section, a pentagon-shaped cross section, a hexagonal-shaped cross-section, or an octagonal-shaped cross-section. 
     
     
         14 . A method according to  claim 11 , wherein the multiple differently-shaped filaments comprise a cross-sectional area of at least about 0.05 mm and at most about 0.25 mm. 
     
     
         15 . A method according to  claim 11 , wherein the multiple differently-shaped filaments comprise Polyethylene Terephthalate (PET). 
     
     
         16 . A method according to  claim 11 , wherein the multiple differently-shaped filaments include magnetic filaments and/or color-changing filaments. 
     
     
         17 . A method according to  claim 11 , further comprising coupling the multiple differently-shaped filaments to a handle. 
     
     
         18 . A mold body comprising:
 a substrate;   a plurality of holes in the substrate for extrusion of filaments, wherein the plurality of holes include at least two shapes to obtain multiple differently-shaped filaments.   
     
     
         19 . A mold body according to  claim 18 , wherein the at least two shapes of the plurality of holes include a circle, a quadrilateral, a triangle, a cross shape, an oval-shape, a square shape, a rectangular shape, a pentagon shape, a hexagonal shape, or an octagonal shape. 
     
     
         20 . A mold body according to  claim 18 , wherein the plurality of holes on a front side of the mold body are larger than the corresponding holes on a back side of the mold body. 
     
     
         21 . A mold body according to  claim 18 , wherein the plurality of holes are arranged in at least two arrangements having a same center point such that a first arrangement of the at least two arrangements has a first area and a second arrangement of the at least two arrangements has a second area, which differs from the area of the first arrangement. 
     
     
         22 . A mold body according to  claim 21 , wherein at least one of the two arrangements includes a circular arrangement, an oval arrangement, a rectangular arrangement, a pentagon arrangement, a hexagon arrangement, an octagon arrangement, or a perimeter arrangement. 
     
     
         23 . A mold body according to  claim 21 , wherein the first arrangement contains holes having a first shape and a second shape, and the second arrangement contains holes having a third shape. 
     
     
         24 . A mold body according to  claim 21 , wherein the first arrangement contains holes having a first shape and a second shape, and the second arrangement contains holes having the first shape. 
     
     
         25 . A mold body according to  claim 21 , wherein the first arrangement contains holes having a first shape, and the second arrangement contains holes having a second shape.