US20070050933A1 - Variable diameter filaments - Google Patents

Variable diameter filaments Download PDF

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Publication number
US20070050933A1
US20070050933A1 US11/219,414 US21941405A US2007050933A1 US 20070050933 A1 US20070050933 A1 US 20070050933A1 US 21941405 A US21941405 A US 21941405A US 2007050933 A1 US2007050933 A1 US 2007050933A1
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US
United States
Prior art keywords
filaments
monofilaments
toothbrush
tuft
inches
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11/219,414
Inventor
Russel Brezler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EI du Pont de Nemours and Co
Original Assignee
EI du Pont de Nemours and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EI du Pont de Nemours and Co filed Critical EI du Pont de Nemours and Co
Priority to US11/219,414 priority Critical patent/US20070050933A1/en
Assigned to E. I. DU PONT DE NEMOURS AND COMPANY reassignment E. I. DU PONT DE NEMOURS AND COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BREZLER, RUSSEL A.
Publication of US20070050933A1 publication Critical patent/US20070050933A1/en
Application status is Abandoned legal-status Critical

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    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46DMANUFACTURE OF BRUSHES
    • A46D1/00Bristles; Selection of materials for bristles
    • AHUMAN NECESSITIES
    • A46BRUSHWARE
    • A46DMANUFACTURE OF BRUSHES
    • A46D1/00Bristles; Selection of materials for bristles
    • A46D1/02Bristles details
    • A46D1/0253Bristles having a shape which is not a straight line, e.g. curved, "S", hook, loop

Abstract

The present invention discloses filaments with varying diameter along its length. This variation in diameter along the length of the filaments, when assembled into a toothbrush tuft improves both the interproximal cleaning and the scrubbing effectiveness of the toothbrush.

Description

    FIELD OF THE INVENTION
  • The present invention relates to a filament that can be used in a toothbrush. More particularly, the present invention relates to a toothbrush having a filament with a varying diameter along its length.
  • BACKGROUND OF THE INVENTION
  • Filaments or bristles for toothbrushes have conventionally been manufactured from constant diameter filaments that are prepared from a thermoplastic polymer. The constant diameter filament has a consistent diameter and cross sectional area along the length of the filament varying not more than 5-10%. There is a continuing need to improve the cleaning performance of such a toothbrush made with these filaments. Cleaning performance is a combination of interproximal cleaning between adjoining teeth and between teeth and gums and the scrubbing action to clean the surface of the teeth and gums. It is known that small diameter filaments tend to improve interproximal cleaning while larger diameter and stiffer filaments provide better scrubbing action and plaque removal.
  • The following disclosures may be relevant to various aspects of the present invention and may be briefly summarized as follows:
  • There are numerous patents covering the use of tipped, constant diameter, filaments in toothbrushes. The following patents were identified that may be relevant: U.S. Pat. No. 6,090,488, U.S. Pat. No. 5,500,975, U.S. Pat. No. 5,533,227, and JP2000279230. However, all of these patents pertain to constant diameter filaments that are chemically tipped or mechanically tipped. This type of tipping is achieved by a secondary operation after the constant diameter filaments are produced. Because these filaments are tipped before being inserted into the toothbrush tuft holes, special care must be taken to insert the tufts at the proper height. This is important because any trimming done to the toothbrushes after tufting will result in the tips being modified which will lead to a decrease in cleaning effectiveness. In some cases special tufting machines and or processes are required to produce the desired brushes. In addition, although these tipped filaments provide excellent interproximal cleaning, they lack scrubbing effectiveness because the tips are very small in diameter. If the tip diameters are increased to improve scrubbing, the interproximal efficiency will be decreased.
  • Therefore, it is desirable to have a filament that can provide interproximal cleaning of smaller diameter filaments and the scrubbing action and plaque removal of the larger diameter and stiffer filaments.
  • SUMMARY OF THE INVENTION
  • Briefly stated, and in accordance with one aspect of the present invention, there is provided a toothbrush comprising: a handle; a toothbrush head distal to the handle; and a plurality of synthetic monofilaments with varying diameter along their length are bundled together forming tufts that are adhered to the toothbrush head, each of said synthetic monofilaments differ in varying diameter along its length from one or more synthetic monofilaments in a tuft.
  • Pursuant to another aspect of the present invention, there is provided a tuft for use in a toothbrush comprising a plurality of synthetic monofilaments with varying diameter along their length are bundled together forming said tuft, each of said synthetic monofilaments may differ in varying diameter along its length from one or more synthetic monofilaments in said tuft.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will be more fully understood from the following detailed description, taken in connection with the accompanying drawings, in which:
  • FIG. 1 shows a cross-sectional photographic view, at a magnification of 20×, of the variable diameters of the present invention in a cut surface piece.
  • FIG. 2 shows a cross-sectional photographic view, at a magnification of 50×, of the filament variable diameters of the present invention in a cut surface piece.
  • FIG. 3 shows a cross-sectional photographic view, at a magnification of 50×, of the filaments of the present invention used to form tufts in a toothbrush having variable diameters ranging from 0.005-0.009 inches.
  • FIG. 4 shows a cross-sectional photographic view, at a magnification of 50×, of filaments of the present invention used in a toothbrush with tip diameters varying from 0.004-0.007 inches.
  • These figures show the varying tip diameter achieved with using the filaments of this invention.
  • While the present invention will be described in connection with a preferred embodiment thereof, it will be understood that it is not intended to limit the invention to that embodiment. On the contrary, it is intended to cover all alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims.
  • DETAILED DESCRIPTION OF THE INVENTION
  • The filaments of the present invention are unique because they provide a variety of different diameters in the same tufts. The filaments are not constant diameter filaments that have been tipped on the ends, but filaments whose diameter varies along their length. The filaments of the current invention provide several benefits over existing constant diameter filaments because they produce a toothbrush that has improved cleaning. The filaments of the current invention provide benefits over existing tipped filaments because they are easier to process and do not require a secondary operation, after manufacturing but prior to tufting, to produce varying diameter tips. The filaments are packaged in a similar manner to current constant diameter filaments and the variable diameter filaments can also be tufted with standard manufacturing processes. Furthermore, the filaments of the present invention provide a combination of diameters in the tuft to provide both excellent interproximal cleaning and surface cleaning of the teeth and gums. The filaments in the assembled toothbrush can also be tipped or end-rounded as part of the normal toothbrush (TB) manufacturing process. An example of end rounding the variable diameter filaments of the present invention is shown in FIGS. 3-4.
  • These filaments were developed for toothbrush applications and improve the cleaning performance of the brush when substituted for constant diameter filaments. The filaments of present invention, when assembled into a toothbrush tuft provide filaments of varying diameters to improve both the interproximal cleaning and the scrubbing effectiveness of the toothbrush.
  • An embodiment of the present invention is a varying diameter synthetic monofilament produced with thermoplastic polymer. Preferred polymers have molecular weights (MW) exceeding 10,000 and most likely consist of polyamides (nylon 612, 610, 6, 1010, 66, blends and copolymers thereof), polyesters (polybutylene terephthalate, polyethylene terephthalate, and blends of the two) and polyolefins (polypropylene).
  • The varying diameter filaments have minimum diameters of 0.003″ to 0.015″ and maximum diameters from 0.005″ to 0.020″ and are produced using a typical monofilament production process for filaments. This process includes melting a polymer or combination of polymers from the list above using a single or twin screw extruder, extruding the molten polymer blend through a spinnerette plate to produce filaments, quenching the filaments, drawing the filaments, annealing the filaments, and assembling the filaments into a hank (e.g. bundle of filaments approximately two (2) inches in diameter). The filaments are drawn at a draw ratio of 3.75-4.25, which produces a filament with a flex modulus of 400,000 to 700,000 psi depending on the polymer used. Filaments can be produced in any color by blending in different colorants or color concentrates. Also, different cross-sectional shapes such as hollow, trilocular, tetralocular and quadrilobal can be produced by extruding through different capillary shapes. In addition, filaments of the present invention can be produced containing a variety of additives such as, but not limited to, clays, Teflon® is micropowders, metal powders, abrasive grits, metal particles, and antimicrobial ingredients.
  • Reference is now made to the drawings for a detailed description of the present invention. After the filaments are packaged into hanks, the hanks are cut into cut pieces of certain lengths. The cut pieces are then assembled into toothbrushes using the standard tufting process. Because the filaments within the hanks vary in diameters along their length, the cut piece cutting process will produce variable filament tip diameters at the surface of the cut pieces. Reference is now made to FIG. 1, which shows this varied filament tip diameter.
  • Reference is now made to FIG. 2, which shows another embodiment of the variability in the diameter of the filaments. The tip diameters can range in size from 0.003 inches to 0.020 inches. When the filaments are tufted into a toothbrush using the standard tufting machines the tips of the filaments in the tufts will also vary in size from 0.003 to 0.020 inches before final processing.
  • EXAMPLE 1
  • A blend of nylon 612 (manufactured as Zytel® by DuPont) was loaded into the hopper of a single screw extruder. A spinneret plate with round capillaries was installed into the die head and the polymer was extruded at 240° C. and quenched in 25° C. water located approximately 1″ below the spinnerette plate. The diameters of the resulting filaments were varied using rubber pinch rolls that were operated at a cyclically varying surface speed as described in U.S. Pat. No. 2,418,492 which resulted in a correspondingly varying strand caliper from 10 to 18 mils. The minimum-to-minimum diameter repeated in increments of 4″. The filaments were oriented by a draw ratio of 3.75:1 to result in varying strand diameters of about 5 to 9 mils. The filaments were heat set by passing through a 170° C.-180° C. oven. After spinning, drawing, and heat setting, the filaments were wound onto a large spool and produced into approximately 98″ long hanks with an average diameter of 2″. The hanks were then wrapped with paper and cut to a final length of about 96 inches. The 96-inch hanks were then cut into 34 mm long cut pieces. The surface of the cut pieces contained filaments of varying diameters from 0.005 inches to 0.009inches and resembled FIGS. 1 and 2. The cut pieces were assembled into toothbrushes using a typical toothbrush tufting machine. The tufts of the toothbrushes were then examined and showed the same variable diameter at the tips. Reference is now made to FIG. 3, which shows a typical tuft produced with this product. FIG. 3 shows a tuft having a variable diameter ranging between 0.005 inches to 0.009 inches.
  • EXAMPLE 2
  • Using the same process as described in Example 1, filament cut pieces with tip diameters varying from 0.004″ to 0.007″ were produced. The 0.004″ to 0.007″ variable diameter material was produced by the extrusion process described in Example 1. The resulting extruded filaments had a varying diameter of 0.008 to 0.014 inches. These were drawn at 3.75:1 and heat set to produce a filament with varying diameters of 0.004 to 0.007 inches. The repeat cycle for the minimum-to-minimum diameter was 4 inches. The filaments were assembled into hanks, wrapped in paper, and cut to 34 mm cut pieces. The cut pieces were assembled into toothbrushes which results in the tufts having filaments with tip diameters varying from 0.004 inches-0.007 inches. The photograph of FIG. 4 shows the actual tufts.
  • The toothbrushes with the 0.004-0.007 inch variable diameter filaments were sent to the University of Pennsylvania for testing in their dental laboratories. The brushes were tested for subgingival access, gingival margin, interproximal access efficacy (IAE), and depth of deposit removal (DDR) and compared with toothbrushes made with 0.005″, 0.006″, and 0.007″ constant diameter filaments. The results of the testing are shown in Table 1. As can be seen, the about 0.004-0.007 inches of variable diameter filaments had good interproximal access, like a 0.005 inch constant diameter filament, but have a higher DDR, like a 0.006 inch filament.
  • With continuing reference to FIG. 4, the toothbrush stiffness was also measured on brushes produced with about 0.004-0.007 inches of variable diameter filaments and about 0.006 inch and about 0.007 inch constant diameter filament. The results are shown in Table 2. As can be seen, the stiffness of the variable diameter brushes is lower than 0.006 inch filament, which translates to gentler treatment on the gums and a softer feel for the user while still providing the DDR that a stiffer 0.006 mil brush would produce. TABLE 1 Cleaning Properties Of Toothbrushes Subgingival Gingival Filament Access Margin IAE DDR .004-.007 0.2 0.94 1.03 2.43 Variable Daimeter .005 Constant 0.2 0.9 1.08 2.35 Diameter .006 Constant 0.17 0.77 1.04 2.46 Diameter .007 Constant 0.03 0.06 0.87 2.62 Diameter
  • TABLE 2 Brush Stiffness Dry Wet Filament Stiffness Stiffness .004-.007 3.57 3.03 Variable Diameter .006 Constant 3.89 3.41 Diameter .007 Constant 5.02 4.49 Diameter
  • It is therefore, apparent that there has been provided in accordance with the present invention, a variable diameter that fully satisfies the aims and advantages hereinbefore set forth. While this invention has been described in conjunction with a specific embodiment thereof, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.

Claims (9)

1. A toothbrush comprising:
a. a handle;
b. a toothbrush head distal to the handle; and
c. a plurality of synthetic monofilaments with varying diameter along their length are bundled together forming tufts that are adhered to the toothbrush head, each of said synthetic monofilaments differ in varying diameter along its length from one or more synthetic monofilaments in a tuft.
2. A toothbrush according to claim 1, wherein each monofilament in the tuft has two ends, a first end and a second end opposite from the other, and said first end varies in diameter from the second end.
3. A toothbrush according to claim 1 or 2, wherein the varying diameter along the length of the monofilaments in the tuft ranges from about 0.003 inches to about 0.020 inches.
4. A toothbrush according to claim 3, wherein the monofilaments in the tuft have a minimum diameter along the monofilament length, said minimum diameter ranging from about 0.003 inches to about 0.015 inches.
5. A toothbrush according to claim 3, wherein the monofilaments in the tuft have a maximum diameter along the monofilament length, said maximum diameter ranging from about 0.005 inches to about 0.020 inches.
6. A toothbrush according to claim 1, wherein the monofilaments material is selected from the group consisting of polyamides, polyesters, polyolefins, blends, copolymers, or combinations thereof.
7. A toothbrush according to claim 1 or 6, wherein the monofilaments have a flex modulus of greater than about 10,000 psi.
8. A toothbrush according to claim 1 or 7, wherein the monofilaments have a flex modulus of about 400,000 psi to about 700,000 psi.
9. A tuft for use in a toothbrush comprising a plurality of synthetic monofilaments with varying diameter along their length are bundled together forming said tuft, each of said synthetic monofilaments may differ in varying diameter along its length from one or more synthetic monofilaments in said tuft.
US11/219,414 2005-09-02 2005-09-02 Variable diameter filaments Abandoned US20070050933A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/219,414 US20070050933A1 (en) 2005-09-02 2005-09-02 Variable diameter filaments

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
US11/219,414 US20070050933A1 (en) 2005-09-02 2005-09-02 Variable diameter filaments
CA 2619961 CA2619961A1 (en) 2005-09-02 2006-09-01 Variable diameter filaments
KR1020087007885A KR20080041738A (en) 2005-09-02 2006-09-01 Variable diameter filaments
PCT/US2006/034226 WO2007028017A1 (en) 2005-09-02 2006-09-01 Variable diameter filaments
CN 200680031720 CN101291604A (en) 2005-09-02 2006-09-01 Variable diameter filaments
EP20060802801 EP1921946A1 (en) 2005-09-02 2006-09-01 Variable diameter filaments
JP2008529309A JP2009506837A (en) 2005-09-02 2006-09-01 Variable diameter filament

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US20070050933A1 true US20070050933A1 (en) 2007-03-08

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US (1) US20070050933A1 (en)
EP (1) EP1921946A1 (en)
JP (1) JP2009506837A (en)
KR (1) KR20080041738A (en)
CN (1) CN101291604A (en)
CA (1) CA2619961A1 (en)
WO (1) WO2007028017A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9613610B2 (en) 2012-07-24 2017-04-04 Koninklijke Philips N.V. Directional sound masking
CN105725480A (en) * 2016-02-23 2016-07-06 无锡市兴达尼龙有限公司 Special-shaped brush wire and making method thereof

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161554A (en) * 1990-07-18 1992-11-10 Georg Karl Geka-Brush Gmbh Brush, in particular mascara brush
US5500975A (en) * 1994-04-15 1996-03-26 Taihei Kogyo Co., Ltd. Toothbrush
US5533227A (en) * 1992-06-22 1996-07-09 Lion Corporation Toothbrush
US6090488A (en) * 1998-03-19 2000-07-18 Cheil Jedant Corporation Tapered toothbrush bristle and toothbrush with said bristles, and methods for producing the same
US6163918A (en) * 1995-09-15 2000-12-26 Pedex & Co. Gmbh Bristles with surface structure, method for their manufacture and interdental cleaner or brush manufactured therefrom
US6199242B1 (en) * 1995-02-01 2001-03-13 Gillette Canada Company Tooth polishing brush
US20030115704A1 (en) * 2001-12-20 2003-06-26 Koninklijke Philips Electronics N.V. Stepped diameter bristles for a toothbrush
US6623200B1 (en) * 1999-11-10 2003-09-23 L'oreal Applicator device and system having particle-laden bristles, method for applying product, and method of making particle-laden bristles
US20040117930A1 (en) * 2002-12-19 2004-06-24 3M Innovative Properties Company Toothbrush
US6764142B2 (en) * 2001-02-23 2004-07-20 Young-Jun Kwon Method of manufacturing a toothbrush with highly tapered bristles having superior flexibility

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04226646A (en) * 1990-09-10 1992-08-17 Itzhak Shoher Periodontal device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5161554A (en) * 1990-07-18 1992-11-10 Georg Karl Geka-Brush Gmbh Brush, in particular mascara brush
US5533227A (en) * 1992-06-22 1996-07-09 Lion Corporation Toothbrush
US5500975A (en) * 1994-04-15 1996-03-26 Taihei Kogyo Co., Ltd. Toothbrush
US6199242B1 (en) * 1995-02-01 2001-03-13 Gillette Canada Company Tooth polishing brush
US6163918A (en) * 1995-09-15 2000-12-26 Pedex & Co. Gmbh Bristles with surface structure, method for their manufacture and interdental cleaner or brush manufactured therefrom
US6090488A (en) * 1998-03-19 2000-07-18 Cheil Jedant Corporation Tapered toothbrush bristle and toothbrush with said bristles, and methods for producing the same
US6623200B1 (en) * 1999-11-10 2003-09-23 L'oreal Applicator device and system having particle-laden bristles, method for applying product, and method of making particle-laden bristles
US6764142B2 (en) * 2001-02-23 2004-07-20 Young-Jun Kwon Method of manufacturing a toothbrush with highly tapered bristles having superior flexibility
US20030115704A1 (en) * 2001-12-20 2003-06-26 Koninklijke Philips Electronics N.V. Stepped diameter bristles for a toothbrush
US20040117930A1 (en) * 2002-12-19 2004-06-24 3M Innovative Properties Company Toothbrush

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Publication number Publication date
EP1921946A1 (en) 2008-05-21
WO2007028017A1 (en) 2007-03-08
CA2619961A1 (en) 2007-03-08
KR20080041738A (en) 2008-05-13
CN101291604A (en) 2008-10-22
JP2009506837A (en) 2009-02-19

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Legal Events

Date Code Title Description
AS Assignment

Owner name: E. I. DU PONT DE NEMOURS AND COMPANY, DELAWARE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BREZLER, RUSSEL A.;REEL/FRAME:016699/0026

Effective date: 20051003

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION