EP3251547B1 - Filament pour un instrument de soins buccaux et ledit instrument - Google Patents

Filament pour un instrument de soins buccaux et ledit instrument Download PDF

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Publication number
EP3251547B1
EP3251547B1 EP16172797.9A EP16172797A EP3251547B1 EP 3251547 B1 EP3251547 B1 EP 3251547B1 EP 16172797 A EP16172797 A EP 16172797A EP 3251547 B1 EP3251547 B1 EP 3251547B1
Authority
EP
European Patent Office
Prior art keywords
tuft
filaments
filament
cross
range
Prior art date
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.)
Active
Application number
EP16172797.9A
Other languages
German (de)
English (en)
Other versions
EP3251547A1 (fr
Inventor
Erwin Paul Mark
Jochen Erich Kawerau
Jens Alinski
Sven Alexander Franke
Karen Lynn Claire-Zimmet
Uwe Jungnickel
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.)
Procter and Gamble Co
Original Assignee
Procter and Gamble 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 Procter and Gamble Co filed Critical Procter and Gamble Co
Priority to FIEP16172797.9T priority Critical patent/FI3251547T3/fi
Priority to EP16172797.9A priority patent/EP3251547B1/fr
Priority to EP16177183.7A priority patent/EP3251546B1/fr
Priority to EP16177188.6A priority patent/EP3251550B1/fr
Priority to EP16177192.8A priority patent/EP3251551B1/fr
Priority to PL16177188T priority patent/PL3251550T3/pl
Priority to PL16177192T priority patent/PL3251551T3/pl
Priority to ES16177336T priority patent/ES2865186T3/es
Priority to ES16177192T priority patent/ES2795427T3/es
Priority to ES16177188T priority patent/ES2778085T3/es
Priority to ES16177183T priority patent/ES2865154T3/es
Priority to EP16177336.1A priority patent/EP3251552B1/fr
Priority to AU2017275479A priority patent/AU2017275479B2/en
Priority to JP2018563005A priority patent/JP2019517317A/ja
Priority to KR1020187035296A priority patent/KR102216265B1/ko
Priority to CA3026171A priority patent/CA3026171C/fr
Priority to CN201780034409.7A priority patent/CN109310203B/zh
Priority to PCT/US2017/034484 priority patent/WO2017210082A1/fr
Priority to JP2018563130A priority patent/JP7195152B2/ja
Priority to CN201780034448.7A priority patent/CN109219373A/zh
Priority to CN202310826733.XA priority patent/CN116869274A/zh
Priority to AU2017275505A priority patent/AU2017275505B2/en
Priority to PCT/US2017/034965 priority patent/WO2017210171A1/fr
Priority to CN201780034446.8A priority patent/CN109219371A/zh
Priority to KR1020187034889A priority patent/KR102216264B1/ko
Priority to CN202310087329.5A priority patent/CN116058592A/zh
Priority to CA3025865A priority patent/CA3025865C/fr
Priority to PCT/US2017/034980 priority patent/WO2017210179A1/fr
Priority to AU2017275497A priority patent/AU2017275497B2/en
Priority to KR1020187034890A priority patent/KR102297299B1/ko
Priority to JP2018563162A priority patent/JP6833874B2/ja
Priority to CA3025772A priority patent/CA3025772C/fr
Priority to AU2017273526A priority patent/AU2017273526B2/en
Priority to CN201780034447.2A priority patent/CN109219372A/zh
Priority to CN202310704015.5A priority patent/CN116849447A/zh
Priority to JP2018562922A priority patent/JP7086865B2/ja
Priority to KR1020187034888A priority patent/KR102216259B1/ko
Priority to CA3025824A priority patent/CA3025824C/fr
Priority to PCT/US2017/035188 priority patent/WO2017210282A1/fr
Priority to AU2017273722A priority patent/AU2017273722B2/en
Priority to KR1020187034885A priority patent/KR102223596B1/ko
Priority to CN201780034407.8A priority patent/CN109310202B/zh
Priority to CA3025876A priority patent/CA3025876C/fr
Priority to PCT/US2017/035384 priority patent/WO2017210389A1/fr
Priority to JP2018563179A priority patent/JP7126952B2/ja
Priority to US15/729,359 priority patent/US11206916B2/en
Priority to US15/729,322 priority patent/US10874205B2/en
Publication of EP3251547A1 publication Critical patent/EP3251547A1/fr
Priority to JP2020174764A priority patent/JP2021035503A/ja
Priority to JP2021025302A priority patent/JP2021100576A/ja
Priority to JP2021063747A priority patent/JP2021106898A/ja
Priority to JP2021078642A priority patent/JP7191449B2/ja
Priority to JP2021188721A priority patent/JP2022043044A/ja
Application granted granted Critical
Publication of EP3251547B1 publication Critical patent/EP3251547B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0238—Bristles with non-round cross-section
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/08—Preparing uniform tufts of bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the present disclosure is concerned with a filament for an oral care implement, the filament having a longitudinal axis and a cross-shaped cross-sectional area extending in a plane perpendicular to the longitudinal axis.
  • the present disclosure is further concerned with a tuft and a head for an oral care implement and an oral care implement comprising such head.
  • Tufts composed of a plurality of filaments for oral care implements, like manual and powered toothbrushes, are well known in the art.
  • the tufts are attached to a bristle carrier of a head intended for insertion into a user's oral cavity.
  • a grip handle is usually attached to the head, which handle is held by the user during brushing.
  • the head is either permanently connected or repeatedly attachable to and detachable from the handle.
  • the contact pressure depends on the bending stiffness and the displacement of the filaments, while the bending stiffness of a single filament depends on its length and cross sectional area.
  • filaments with greater length show lower bending stiffness as compared to shorter filaments.
  • relatively thin filaments tend to flex away easily and the relatively low bending stiffness results in reduced plaque removal efficiency on teeth surfaces, as well as in less interdental penetrations properties and cleaning performance.
  • the size of the cross sectional area of a filament could be increased.
  • relatively thick filaments may create an unpleasant brushing sensation and tend to injure the gums in the oral cavity.
  • thicker filaments may show reduced bend recovery and usage of said filaments may generate a worn-out impression of the tuft pattern after a relatively short time of use.
  • filaments having a profile along their length extension resulting in a non-circular cross sectional area are also known in the art.
  • Such filaments should improve cleaning properties of oral care implements during normal use.
  • the profiled edges should provide a stronger scraping action during a brushing process to improve removal of plaque and other residuals on the teeth surfaces.
  • WO 89/04167 A1 discloses a toothbrush having a plurality of bristles of synthetic thermoplastic polymeric composition.
  • the bristles have a plurality of channels extending along the length thereof.
  • the channels have a depth sufficient to entrap a quantity of toothpaste abrasive.
  • WO 97/09907 A1 discloses a toothbrush comprising a brush head and plastic bristles.
  • the lateral faces of some of the bristles carry a spiral profile in order to obtain increased brushing and massage effect without changing the resistance of the bristles.
  • the bristles comprise a core and at least one spiral running up the lateral faces.
  • JP 2001 169829 A discloses a bristle for toothbrushes, the bristle being composed of polyester and being formed to have a modified cross-sectional shape, and a tapered part is formed on at least one end of the bristle.
  • JP 2005 185399 A discloses a toothbrush comprising bristle tufts.
  • the total cross-sectional area of a bristle tuft is equal to or less than 1.0 mm 2 , and the packing factor is equal to or more than 50%.
  • EP 2 918 191 A1 discloses a head for an oral care implement that comprises at least one tuft mounted on a mounting surface.
  • the tuft has a longitudinal axis and a cross-sectional area extending in a plane that is perpendicular to the longitudinal axis.
  • the tuft comprises a plurality of cylindrical filaments.
  • Each filament has a longitudinal axis and a cross-sectional area extending in a plane that is perpendicular to the longitudinal axis.
  • the cross-sectional area of each filament has a non-circular shape and the plurality of filaments is arranged in a manner that the cross-sectional area of the tuft has a scaled-up shape with respect to the shape of the cross-sectional area of each filament.
  • toothbrushes comprising these types of filaments clean the outer buccal face of teeth adequately, they are generally not as well suited to provide adequate removal of plaque and debris from the interproximal areas and other hard to reach areas of the mouth since penetration into interdental spaces is still relatively difficult. Furthermore, during manufacturing processes and during brushing actions cross-shaped filaments/bristles can easily catch amongst themselves which results in a worn-out appearance of the toothbrush. Additionally, these filaments do not provide sufficient capillary effects to remove plaque and debris from the teeth and gum surfaces during brushing.
  • a tuft for an oral care implement comprising a plurality of filaments is provided, according to claim 1.
  • a head for an oral care implement that comprises such tuft.
  • an oral care implement that comprises such head.
  • the filament according to the present disclosure has a longitudinal axis which is defined by the main extension of the filament.
  • the extension of the filament along its longitudinal axis may also be referred to as the "longitudinal extension of the filament”.
  • the filament has a cross-sectional area which extends in a plane that is perpendicular to the longitudinal axis.
  • the shape of said cross-sectional area is cross-shaped.
  • the cross-shaped cross-sectional area comprises four projections and four channels wherein the projections and channels are arranged in an alternating manner.
  • Two neighboring projections, i.e. two neighboring side lateral edges of said projections converge at the bottom of a channel and define a "converging region".
  • the neighboring projections converge in said converging region in a manner that a concave curvature, i.e. with an inwardly curved radius is formed at the bottom of the channel.
  • the cross-shaped cross sectional area has an outer diameter.
  • the outer diameter is defined by the length of a straight line that passes through the center of the filament's cross-sectional area and whose endpoints lie on the most outer circumference of the cross-sectional area.
  • the cross-shaped cross-sectional area has an imaginary outer circumference in the form of a circle (i.e. outer envelope circle), and the outer diameter is defined as the longest straight line segment of the circle passing through the center of the circle.
  • the radius of the concave curvature at the bottom of the channel is within a range from 0.015 mm to 0.12 mm, and the ratio of the outer diameter to the radius is within a range from 2.5 to 12.
  • the radius may be within a range from 0.03 mm to 0.10 mm, and the ratio of the outer diameter to the radius may be within a range from 2.7 to 9.
  • the outer diameter may be within a range from 0.15 mm to 0.40 mm, or from 0.19 mm to 0.38 mm, or the outer diameter may be within a range from 0.22 mm to 0.35 mm, or from 0.24 mm to 0.31 mm.
  • a radius of the curvature at the bottom of the channel within a range from 0.015 mm to 0.12 mm, or from 0.03 mm to 0.10 mm is relatively large as compared to standard cross-shaped filaments.
  • Each projection of the cross-shaped cross-sectional area comprises two outer lateral edges along the filament's longitudinal extension. These lateral edges may generate relatively high concentrated stress on the tooth surfaces to disrupt and remove plaque. The outer edges can provide a scraping effect so that plaque and other debris get loosened more effectively. Due to the relatively large radius at the bottom of the channel, the projections are provided with increased stiffness/stability to loosen/remove plaque from the teeth surfaces more easily/effectively. The channels can then capture the disrupted plaque and may move it away from the teeth.
  • the cannels may facilitate that the filaments can be packed within a tuft with less density resulting in even more dentifrice/toothpaste retaining at/adhering to the filaments for a longer period of time during a tooth brushing process and may avoid that the dentifrice spread away which may result in an improved overall brushing process.
  • toothpaste can be better received in the cannels and, upon cleaning contact with the teeth, directly delivered, whereby a greater polishing effect is achieved, which is desirable, in particular for removal of tooth discoloration.
  • the decreased filament density within a tuft may provide an improved capillary action which may enable the dentifrice to flow towards the tip/free end of the filament and, thus, may make the dentifrice better available to the teeth and gums during brushing.
  • that capillary effect may further facilitate the uptake of plaque to improve the overall cleaning performance/efficiency during tooth brushing.
  • a tuft comprising a plurality of filaments provides improved plaque removal from the buccal, lingual, occlusal and interdental surfaces as well as along the gumline as compared to a tuft of circular or conventional cross-shaped filaments.
  • the projections of the cross-shaped filament taper radially off in an outward direction, i.e. in a direction away from the center of the cross-sectional area and towards the outer circumference.
  • Such tapered projections may assure access to narrow spaces and other hard to reach areas and may be able to penetrate into/enter interdental areas even more deeply and effectively. Since the bending stiffness of a cross-shaped filament is higher as compared to a circular-shaped filament made of the same amount of material, the higher bending stiffness may force the filament's projections to slide into the interdental areas more easily.
  • the projections taper radially outwards by an angle within a range from 6° to 25° , and optionally by an angle within a range from 8° to 20°. Surprisingly, it has been found out that such tapering allows for optimal interdental penetration properties. Additionally, such filament can be more easily bundled in a tuft without catching on contours of adj acent filaments.
  • Each projection has a width extension extending between two opposite lateral edges.
  • Said width extension may be within a range from 6% to 15% or from 8% to 12% of the outer diameter of the filament.
  • Said width extension may be within a range from 0.016 mm to 0.041 mm, or from 0.021 mm to 0.033 mm.
  • Such filaments may adapt to the teeth contour in a better manner and penetrate into the interdental spaces more easily to remove plaque and debris more completely.
  • the filament may be a cylindrical filament, i.e. the filament may have a substantially cylindrical outer lateral surface.
  • the shape and size of the cross-sectional area of the filament along its longitudinal axis may not vary substantially, i.e. the shape and size of the cross-sectional area may be substantially constant over the longitudinal extension of the filament.
  • the term "outer lateral surface of a filament” means any outer face or surface of the filament on its sides. This type of filament may provide increased bending stiffness as compared to tapered filaments. A higher bending stiffness may facilitate the filament to penetrate into interdental gaps/spaces. Further, cylindrical filaments are generally slowly worn away which may provide longer lifetime of the filaments.
  • the cylindrical filament may have a end-rounded tip/free end to provide gentle cleaning properties. End-rounded tips may avoid that gums get injured during brushing. Within the context of this disclosure, end-rounded filaments would still fall under the definition of a cylindrical filament.
  • the filament may comprise along its longitudinal axis a cylindrical portion and a tapered portion, the tapered portion tapers in the longitudinal direction towards a free end of the filament, and the cylindrical portion has a cross-sectional area according to the present disclosure.
  • the filament may be a tapered filament having a pointed tip. Tapered filaments may achieve optimal penetration into areas between two teeth as well as into gingival pockets during brushing and may provide improved cleaning properties.
  • the tapered filament may have an overall length extending above the mounting surface within a range from about 8 mm to about 16 mm, optionally about 12.5 mm, and a tapered portion within a range from about 5 mm to about 10 mm measured from the tip of the filament.
  • the pointed tip may be needle shaped, may comprise a split or a feathered end.
  • the tapering portion may be produced by a chemical and/or mechanical tapering process.
  • the filament may be made of polyamide, e.g. nylon, with or without an abrasive such as kaolin clay, polybutylene terephtalate (PBT) with or without an abrasive such as kaolin clay and/or of polyamide indicator material, e.g. nylon indicator material, colored at the outer surface.
  • polyamide indicator material e.g. nylon indicator material
  • the filament may comprise at least two segments of different materials. At least one segment may comprise a thermoplastic elastomer material (TPE) and at least one segment may comprise polyamide, e.g. nylon, with or without an abrasive such as kaolin clay, polybutylene terephtalate (PBT) with or without an abrasive such as kaolin clay or a polyamide indicator material, e.g. a nylon indicator material, colored at the outer surface.
  • TPE thermoplastic elastomer material
  • polyamide indicator material e.g. a nylon indicator material
  • These at least two segments may be arranged in a side-by-side structure or in a core-sheath structure which may result in reduced stiffness of the overall filament.
  • the filament may comprise a component selected from fluoride, zinc, strontium salts, flavor, silica, pyrophosphate, hydrogen peroxide, potassium nitrate or combinations thereof.
  • fluoride may provide a mineralization effect and, thus, may prevent tooth decay.
  • Zinc may strengthen the immune system of the user.
  • Hydrogen peroxide may bleach/whiten the teeth.
  • Silica may have an abrasive effect to remove dental plaque and debris more effectively.
  • Pyrophosphate may inhibit the formation of new plaque, tartar and dental calculus along the gum line.
  • a filaments comprising pyrophosphate may offer lasting protection against inflammations of the gums and mucous membrane of the mouth.
  • filaments at the tuft's outer lateral surface may comprise pyrophosphate to inhibit the formation of plaque, tartar and dental calculus along the gum line whereas filaments arranged in the center of the tuft may comprise fluoride to mineralize the teeth during a brushing process.
  • At least one of the components listed above may be coated onto a sheath, i.e. onto an outer segment of a filament.
  • at least some of the filaments of the tuft may comprise a core-sheath structure wherein the inner/core segment may comprise TPE, polyamide or PBT, and the outer/sheath segment may comprise at least one of the components listed above.
  • Such core-sheath structure may make the component(s) directly available to the teeth in a relatively high concentration, i.e. the component(s) may be in direct contact with the teeth during brushing.
  • At least one of the components listed above may be co-extruded with TPE, polyamide, e.g. nylon, and/or PBT. Such embodiments may make the component(s) gradually available to the teeth when the filament material is slowly worn away during use.
  • a plurality of filaments according to any of the embodiments described above may be bundled together to form a tuft attached to an oral care implement.
  • the oral care implement may be a toothbrush comprising a handle and a head.
  • the head extends from the handle and may be either repeatedly attachable to and detachable from the handle or the head may be non-detachably connected to the handle.
  • the toothbrush may be an electrical or a manual toothbrush.
  • the head may comprise a bristle carrier having a substantially circular or oval shape.
  • a bristle carrier may be provided for an electrical toothbrush which may perform a rotational oscillation movement.
  • the bristle carrier of an electrical toothbrush can be driven to rotate about and to move axially along an axis of movement in an oscillating manner, wherein such axis of movement may extend substantially perpendicular to the plane defined by the upper top surface of the bristle carrier.
  • One or more tuft(s) comprising a plurality of filaments according to the present disclosure may be attached to the bristle carrier. Said tuft(s) may allow the filaments projections to penetrate into interdental areas and hard to reach regions more easily during the rotational oscillation movement of the head which may provide further improved cleaning properties of the head. Plaque and other residues may be loosened by the oscillating action of the filaments being substantially perpendicular to the tooth surfaces, whereas the rotational movement may sweep the plaque and further residues away.
  • the tuft according to the present disclosure may have a packing factor within a range from 40% to 60%, preferably from 40% to 45%, further preferably 40%, or 45%, or 46%, or 49%. Surprisingly, it has been found out that filaments according to the present disclosure may allow for such a relatively low packing factor of the filaments within the tuft as gaps between two adjacent filaments can be maximized.
  • packing factor is defined as the sum total of the transverse cross-sectional areas of the filaments in the tuft hole divided by the transverse cross-sectional area of the tuft hole.
  • the area of the anchoring means is excluded from the transverse cross-sectional area of the tuft hole.
  • a packing factor of about 45% opens up a specific void volume within the tuft while the filaments have still contact to each other along a portion of the outer lateral surface.
  • the void volume may deliver more toothpaste to the tooth brushing process and the toothpaste can interact with the teeth for a longer period of time which contributes to improved tooth brushing effects.
  • the void volume i.e. the space between filaments, enables increased uptake of loosened plaque due to improved capillary action.
  • this void volume can be achieved by using filaments according to the present disclosure. It has been found out that it is important that the filaments open up a void area while still having contact to each other.
  • a high packing factor about 70% to about 80% for round filaments; about 80% for diamond-shaped filaments; about 89% for trilobal filaments
  • a packing factor lower than about 70% results in insufficiently compressed filaments within the tuft hole and, thus, provides insufficient tuft retention.
  • a relatively low packing factor within a range within a range from 40% to 60%, preferably from 40% to 45%, further preferably 40%, or 45%, or 46%, or 49% may provide improved brushing effectiveness, i.e. better removal of plaque and debris from the teeth's surface and gums due to improved capillary effects. These capillary effects may enable the dentifrice to flow towards the tip/free end of the filaments and, thus, may make the dentifrice more available to the teeth and gums during brushing. At the same time uptake of plaque and debris away from the teeth and gum surfaces is improved.
  • each single filament is stiffer than a circular shaped filament, when made of the same amount of material.
  • the stiffness of the overall tuft made of filaments according to the present disclosure is reduced as compared to a tuft of circular shaped filaments. This results in improved sensory experience during brushing while providing increased cleaning efficiency.
  • the at least one tuft attached to the head for an oral care implement may have a longitudinal axis and a cross-sectional area which extends in a plane that is perpendicular to said longitudinal axis.
  • the plurality of filaments may be arranged in a manner that the cross-sectional area of the tuft has a scaled up shape of the respective shape of each individual filament which makes up the tuft.
  • the tuft is a scaled up version of its filaments, i.e. the shape of the cross-sectional area of the tuft may have substantially the same cross-shaped cross-sectional area as each individual filament but in a larger size.
  • the shape of the cross-sectional area of the tuft may correspond to the shape of the cross-sectional area of its filaments.
  • cross-sectional area having a scaled up shape means a cross-sectional area comprising the same shape but in increased size.
  • the type of shape may be the same but the size of the cross-sectional area is different, i.e. increased.
  • Any gaps, irregularities, reliefs or slots which may be present between two adjacent individual filaments at the outer circumference of the cross-sectional area of the tuft do not contribute to the substantial shape of said cross-sectional area and are, thus, to be neglected.
  • Such tuft may provide increased cleaning properties.
  • the specific shape/geometry of the individual filaments has specific cleaning properties which differ from the properties of regular filaments with a circular or conventional cross-shaped cross-sectional area. These specific cleaning properties may be enhanced by arranging the filaments in a manner so that they form a cross-sectional shape of the overall tuft which is a scaled up version of the cross-sectional shape of each individual filament.
  • the tuft in accordance with the present disclosure may communicate the respective geometry to the user and, thus, the corresponding cleaning properties of the filaments which make up said tuft.
  • the filaments and the tuft may provide anisotropic bending stiffness properties during a brushing process.
  • the amount of deflection/displacement of the filaments/tuft depends on the diameter/radius of the filaments/tuft. The smaller the diameter/radius, the higher is the deflection/displacement of the free end of the filaments/tuft, and vice versa, the larger the diameter/radius, the smaller is the deflection/displacement of the free end of the filaments/tuft.
  • the tuft may be arranged on the mounting surface of the head in a manner that higher bending stiffness is provided in a direction where higher cleaning forces may be needed. Lower bending stiffness may be provided in a direction where gentle cleaning forces or a massaging effect may be required.
  • a head for an oral care implement in accordance with the present disclosure may comprise a bristle carrier being provided with at least one tuft hole, e.g. a blind-end bore.
  • a tuft comprising a plurality of filaments according to the present disclosure may be fixed/anchored in said tuft hole by a stapling process/anchor tufting method. This means, that the filaments of the tuft are bent/folded around an anchor, e.g. an anchor wire or anchor plate, for example made of metal, in a substantially U-shaped manner. The filaments together with the anchor are pushed into the tuft hole so that the anchor penetrates into opposing side walls of the tuft hole thereby anchoring/fixing/fastening the filaments to the bristle carrier.
  • an anchor e.g. an anchor wire or anchor plate, for example made of metal
  • the anchor may be fixed in opposing side walls by positive and frictional engagement.
  • the anchor holds the filaments against a bottom of the bore.
  • the anchor may lie over the U-shaped bend in a substantially perpendicular manner. Since the filaments of the tuft are bent around the anchor in a substantially U-shaped configuration, a first limb and a second limb of each filament extend from the bristle carrier in a filament direction.
  • Filament types which can be used/are suitable for usage in a stapling process are also called "two-sided filaments". Heads for oral care implements which are manufactured by a stapling process can be provided in a relatively low-cost and time-efficient manner.
  • the filament according to the present disclosure Due to the improved geometry of the filament according to the present disclosure, fewer filaments get damaged, e.g. by slicing, when the filaments get picked and fixed on the mounting surface of the brush head during the stapling process. Further, fewer filaments get caught on the outer surface of a neighboring filament when a plurality of filaments are picked to form one tuft.
  • the at least one tuft may be attached/secured to the head by means of a hot tufting process.
  • One method of manufacturing the head of an oral care implement may comprise the following steps: Firstly, the at least one tuft may be formed by providing a desired amount of filaments according to the present disclosure. Secondly, the tuft may be placed into a mold cavity so that ends of the filaments which are supposed to be attached to the head extend into said cavity. Thirdly, the head or an oral care implement body comprising the head and the handle may be formed around the ends of the filaments extending into the mold cavity by an injection molding process, thereby anchoring the at least one tuft in the head.
  • the tuft may be anchored by forming a first part of the head - a so called "sealplate" - around the ends of the filaments extending into the mold cavity by an injection molding process before the remaining part of the oral care implement may be formed.
  • the ends of the at least one tuft extending into the mold cavity may be optionally melted or fusion-bonded to join the filaments together in a fused mass or ball so that the fused masses or balls are located within the cavity.
  • the at least one tuft may be held in the mold cavity by a mold bar having blind holes that correspond to the desired position of the tuft on the finished head of the oral care implement.
  • the filaments of the at least one tuft attached to the head by means of a hot tufting process may be not doubled over a middle portion along their length and may be not mounted in the head by using an anchor/staple.
  • the at least one tuft may be mounted on the head by means of an anchor-free tufting process.
  • a hot tufting manufacturing process allows for complex tuft geometries.
  • the tuft may have a specific topography/geometry at its free end, i.e. at its upper top surface, which may be shaped to optimally adapt to the teeth's contour and to further enhance interdental penetration.
  • the topography may be chamfered or rounded in one or two directions, pointed or may be formed linear, concave or convex.
  • the filament according to the present disclosure Due to the improved geometry of the filament according to the present disclosure, fewer filaments get damaged, e.g. by slicing, when the filaments get picked and fixed on the mounting surface of the brush head during the hot-tufting process. Further, fewer filaments get caught on the outer surface of a neighboring filament when a plurality of filaments are picked to form one tuft.
  • Fig. 1 shows a perspective top-down view of an oral care implement 10 which could be a manual or an electrical toothbrush 10 comprising a handle 12 and a head 14 extending from the handle 12 in a longitudinal direction.
  • the head 14 has a proximal end 41 close to the handle 12 and a distal end 40 furthest away from the handle 12, i.e. opposite the proximal end 41.
  • the head 14 may have substantially the shape of an oval with a length extension 52 and a width extension 51 substantially perpendicular to the length extension 52.
  • a plurality of tufts 16 having a plurality of filaments 20 in accordance with the present disclosure may be secured to the head 14 by means of a hot tufting or stapling process.
  • the tufts 16 may extend from a mounting surface 18 of the head 14 in a substantially orthogonal manner.
  • the tufts 16 as illustrated in Fig. 1 comprise a plurality of end-rounded filaments 20, one of them being shown in Fig. 2 .
  • the filaments 20 may be tapered filaments comprising along the longitudinal axis a cylindrical portion and a tapered portion. The tapered portion tapers towards the free end of the filament 20, and the cylindrical portion has a cross-sectional area 22 according to the present disclosure.
  • the plurality of filaments 20 is arranged in a manner that the tufts 16 have a cross-sectional area 32 with a scaled up shape of the shape of each individual filament 20.
  • the shape of the cross-sectional area 32 of the tufts 16 corresponds to the shape of the cross-sectional area 22 of each individual filament 20.
  • the tufts 16 may have a packing factor within a range from about 40% to about 60%, or from about 45% to about 55%.
  • the "packing factor" is defined as the total sum of the cross-sectional areas 22 of the filaments 20 divided by the cross-sectional area of the tuft hole.
  • Fig. 2 shows a schematic cross-sectional view of a filament 20 according to the present disclosure.
  • the filament 20 has a longitudinal axis and a cross-shaped cross-sectional area 22 extending in a plane perpendicular to the longitudinal axis.
  • the cross-shaped cross-sectional area 22 has four projections 24 and four channels 26.
  • the projections 24 and channels 26 are arranged in an alternating manner.
  • Each projection 24 tapers in an outward direction by an angle ⁇ within a range from 6° to 25°, optionally from 8° to 20°.
  • the cross-sectional area 22 has an outer diameter 28 passing through the center 36 of the filament's cross-sectional area 22.
  • the endpoints of the outer diameter 28 lie on the most outer circumference 38 of the cross-sectional area 22.
  • the outer diameter 28 has a length extension within a range from 0.15 mm to 0.40 mm, from 0.19 mm to 0.38 mm, from 0.22 mm to 0.35 mm, or from 0.24 mm to 0.31 mm.
  • each channel 26 has a concave curvature 34, i.e. a curvature being curved inwardly towards the center 36 of the cross-sectional area 22.
  • the concave curvature 34 is formed at the bottom of each channel 26 by two neighboring and converging projections 24.
  • the concave curvature 34 has a radius 30 which is in a range from 0.015 mm to 0.12 mm, and the ratio of the outer diameter 28 to the radius 30 is within a range from 2.5 to 12. Alternatively, the radius 30 is within a range from 0.03 mm to 0.10 mm, and the ratio of the outer diameter 28 to the radius 30 is within a range from 2.7 to 9.
  • Each projection has a width extension 42 extending between two opposite lateral edges 44, and the width extension 42 is defined in a range from about 6% to about 15%, or from about 8% to about 12% of the outer diameter 28 of the filament 20.
  • the width extension 42 may be within a range from 0.016 mm to 0.041 mm, or from 0.021 mm to 0.033 mm.
  • Each projection 24 may be end-rounded having a curvature with a radius 46 of 0.02 mm.
  • FIG. 3 shows a schematic cross-sectional view of a cross-shaped filament 54 according to the state of the art.
  • Filament 54 comprises the following dimensions:
  • Fig. 4 shows a schematic cross-sectional view of example embodiment 1 of a tuft 66 according to the present disclosure.
  • Tuft 66 has a packing factor of about 49%.
  • the filaments 68 of tuft 66 have the following dimensions:
  • Fig. 5 shows a schematic cross-sectional view of a tuft 72 comprising a plurality of circular filaments 74 according to the state of the art.
  • the diameter of filaments 74 is about 0.178 mm (7 mil).
  • Such tuft 72 has a packing factor of about 77% (comparative example 2).
  • Fig. 6 shows a schematic cross-sectional view of a tuft 76 comprising a plurality of filaments 54 according to Fig. 3 .
  • Such tuft 76 has a packing factor of about 58% (comparative example 3).
  • the tuft 66 (diameter of the tuft: 1.7 mm) in accordance with Fig. 4 comprising a plurality of filaments 68 (example embodiment 1), the tuft 72 (diameter of the tuft: 1.7 mm) according to Fig. 5 comprising a plurality of filaments 74 (comparative example 2), and the tuft 76 (diameter of the tuft: 1.7 mm) according to Fig. 6 comprising a plurality of filaments 54 (comparative example 3) were compared with respect to their efficiency of plaque substitute removal on artificial teeth (typodonts).
  • Fig. 7 shows the amount of plaque substitute removal in % of example embodiment 1, comparative example 2 and comparative example 3, each with respect to all tooth surfaces 78, buccal surfaces 80, lingual surfaces 82, lingual and buccal surfaces 84, occlusal surfaces 86, the gum line 88 and interdental surfaces 90.
  • Fig. 7 clearly shows that example embodiment 1 provides significant improved plaque removal properties with respect all tooth surfaces 78, buccal surfaces 80, lingual surfaces 82, lingual and buccal surfaces 84, occlusal surfaces 86, the gum line 88 and interdental surfaces 90 as compared to comparative examples 2 and 3.
  • the most significant improvement of the cleaning performance occurred on the occlusal surfaces 86 with an improvement of 22 % and 9%, respectively.
  • Fig. 8 shows a diagram in which "slurry uptake mass" of a tuft (diameter of the tuft: 1.7 mm) comprising filaments in accordance with the present disclosure and having a packing factor of about 46% (example embodiment 4) is compared with "slurry uptake mass" of a tuft (diameter of the tuft: 1.7 mm) comprising diamond shaped filaments (cf. Fig. 10 ) and having a packing factor of about 80% (comparative example 5), and with "slurry uptake mass" of the tuft 72 according to comparative example 2.
  • the filaments of example embodiment 4 have the following dimensions:
  • the filaments of comparative example 5 have the following dimensions ( Fig. 10 ):
  • Fig. 9 shows a diagram in which "slurry uptake speed" of example embodiment 4 is compared with “slurry uptake speed” of comparative examples 2 and 5.
  • Brush heads comprising tufts according to example embodiment 4 and comparative examples 2 and 5 were fixed in a horizontal position with filaments pointing down.
  • the brushes moved down with 100mm/s and dipped 2mm deep into the slurry. Then the brushes were hold for 5s in the toothpaste slurry and pulled out again with 100mm/min. The force in vertical direction was measured over time.
  • example embodiment 4 provides significant improved "slurry uptake” in terms of mass and speed as compared to comparative examples 2 and 5.
  • the increased void volume within the tuft of example embodiment 4 enables improved capillary action. This leads to increased uptake of toothpaste (slurry) so that the toothpaste interacts/contributes longer to the tooth brushing process.
  • the tuft of example embodiment 4 can take-up about 50% more toothpaste slurry with about 50% higher uptake speed which results in improved tooth cleaning effects.
  • the specific void volume within the tuft of example embodiment 4 enables also increased uptake of loosened plaque. This results in an overall improved clinical performance of a toothbrush comprising cross-shaped filaments according to the present disclosure which enable a lower packing factor.

Claims (11)

  1. Touffe (16, 66) destinée à un instrument de soins bucco-dentaires (10) comprenant une pluralité de filaments (20), chaque filament (20) ayant un axe longitudinal et une aire en coupe transversale (22) en forme de croix s'étendant dans un plan perpendiculaire à l'axe longitudinal, l'aire en coupe transversale (22) en forme de croix ayant quatre saillies (24) et quatre canaux (26), les saillies (24) et les canaux (26) étant agencés d'une manière alternée, l'aire en coupe transversale (22) ayant un diamètre externe (28), et chaque canal (26) ayant une courbure concave (34) formée par des saillies (24) voisines et convergentes, la courbure concave (34) ayant un rayon (30), le rayon (30) étant dans une plage allant de 0,015 mm à 0,12 mm, et le rapport du diamètre externe (28) au rayon (30) étant dans une plage allant de 2,5 à 12, caractérisée en ce que la touffe (16, 66) a un facteur d'empilement dans une plage allant de 40 % à 60 %, de préférence de 40 % à 45 %, de préférence encore de 40 %, ou de 45 %, ou de 46 %, ou de 49 %, dans laquelle chaque saillie (24) s'effile dans la direction vers l'extérieur selon un angle défini dans une plage allant de 6° à 25°.
  2. Touffe (16, 66) selon la revendication 1, dans laquelle le rayon (30) est dans une plage allant de 0,03 mm à 0,10 mm, et le rapport du diamètre externe (28) au rayon (30) est dans une plage allant de 2,7 à 9.
  3. Touffe (16, 66) selon la revendication 1 ou 2, dans laquelle le diamètre externe (28) est dans une plage allant de 0,15 mm à 0,40 mm, de préférence de 0,19 mm à 0,38 mm.
  4. Touffe (16, 66) selon l'une quelconque des revendications précédentes, dans laquelle le diamètre externe (28) est dans une plage allant de 0,22 mm à 0,35 mm, de préférence encore de 0,24 mm à 0,31 mm.
  5. Touffe (16, 66) selon l'une quelconque des revendications précédentes, dans laquelle chaque saillie (24) s'effile dans la direction vers l'extérieur selon un angle défini dans une plage allant de 8° à 20°.
  6. Touffe (16, 66) selon l'une quelconque des revendications précédentes, dans laquelle chaque saillie (24) a une extension de largeur (42) s'étendant entre deux bords latéraux opposés (44), et l'extension de largeur (42) est définie dans une plage allant de 6 % à 15 % du diamètre externe (28) du filament (20).
  7. Touffe (16, 66) selon la revendication 6, dans laquelle l'extension de largeur (42) est dans une plage allant de 8 % à 12 % du diamètre externe (28) du filament (20).
  8. Touffe (16, 66) selon la revendication 6 ou 7, dans laquelle l'extension de largeur (42) est dans une plage allant de 0,016 mm à 0,041 mm, de préférence de 0,021 mm à 0,033 mm.
  9. Touffe (16, 66) selon l'une quelconque des revendications précédentes, dans laquelle le filament (20) comprend le long de son axe longitudinal une partie cylindrique et une partie effilée, la partie effilée s'effile en direction d'une extrémité libre du filament, et la partie cylindrique a une aire en coupe transversale (22) selon l'une quelconque des revendications précédentes.
  10. Tête (14) destinée à un instrument de soins bucco-dentaires (10) comprenant une touffe (16, 66) de filaments (20) selon l'une quelconque des revendications précédentes.
  11. Instrument de soins bucco-dentaires (10) comprenant une tête (14) selon la revendication 10.
EP16172797.9A 2016-06-03 2016-06-03 Filament pour un instrument de soins buccaux et ledit instrument Active EP3251547B1 (fr)

Priority Applications (52)

Application Number Priority Date Filing Date Title
FIEP16172797.9T FI3251547T3 (fi) 2016-06-03 2016-06-03 Filamentti suunhoitovälineelle ja suunhoitoväline
EP16172797.9A EP3251547B1 (fr) 2016-06-03 2016-06-03 Filament pour un instrument de soins buccaux et ledit instrument
EP16177183.7A EP3251546B1 (fr) 2016-06-03 2016-06-30 Tête pour un instrument de soins buccaux et instrument pour soins buccaux
EP16177188.6A EP3251550B1 (fr) 2016-06-03 2016-06-30 Tête pour un instrument de soins buccaux et instrument pour soins buccaux
EP16177192.8A EP3251551B1 (fr) 2016-06-03 2016-06-30 Tête pour un instrument de soins buccaux et instrument pour soins buccaux
PL16177188T PL3251550T3 (pl) 2016-06-03 2016-06-30 Głowica narzędzia do higieny jamy ustnej i narzędzie do higieny jamy ustnej
PL16177192T PL3251551T3 (pl) 2016-06-03 2016-06-30 Głowica narzędzia do higieny jamy ustnej i narzędzie do higieny jamy ustnej
ES16177336T ES2865186T3 (es) 2016-06-03 2016-06-30 Cabezal para un utensilio de cuidado bucal y utensilio de cuidado bucal
ES16177192T ES2795427T3 (es) 2016-06-03 2016-06-30 Cabezal para un utensilio de cuidado bucal y utensilio de cuidado bucal
ES16177188T ES2778085T3 (es) 2016-06-03 2016-06-30 Cabezal para un utensilio de cuidado bucal y utensilio de cuidado bucal
ES16177183T ES2865154T3 (es) 2016-06-03 2016-06-30 Cabezal para un utensilio de cuidado bucal y utensilio de cuidado bucal
EP16177336.1A EP3251552B1 (fr) 2016-06-03 2016-06-30 Tête pour un instrument de soins buccaux et instrument pour soins buccaux
AU2017275479A AU2017275479B2 (en) 2016-06-03 2017-05-25 Head for an oral care implement and oral care implement
JP2018563005A JP2019517317A (ja) 2016-06-03 2017-05-25 口腔ケア器具用のヘッド及び口腔ケア器具
KR1020187035296A KR102216265B1 (ko) 2016-06-03 2017-05-25 구강 케어 기구용 헤드 및 구강 케어 기구
CA3026171A CA3026171C (fr) 2016-06-03 2017-05-25 Tete pour instrument d'hygiene buccale, et instrument d'hygiene buccale
CN201780034409.7A CN109310203B (zh) 2016-06-03 2017-05-25 用于口腔护理工具的头部和口腔护理工具
PCT/US2017/034484 WO2017210082A1 (fr) 2016-06-03 2017-05-25 Tête pour instrument d'hygiène buccale, et instrument d'hygiène buccale
JP2018563130A JP7195152B2 (ja) 2016-06-03 2017-05-30 口腔ケア器具用のヘッド及び口腔ケア器具
CN201780034448.7A CN109219373A (zh) 2016-06-03 2017-05-30 用于口腔护理工具的头部和口腔护理工具
CN202310826733.XA CN116869274A (zh) 2016-06-03 2017-05-30 用于口腔护理工具的头部和口腔护理工具
AU2017275505A AU2017275505B2 (en) 2016-06-03 2017-05-30 Head for an oral care implement and oral care implement
PCT/US2017/034965 WO2017210171A1 (fr) 2016-06-03 2017-05-30 Tête pour instrument d'hygiène buccale, et instrument d'hygiène buccale
CN201780034446.8A CN109219371A (zh) 2016-06-03 2017-05-30 用于口腔护理工具的头部和口腔护理工具
KR1020187034889A KR102216264B1 (ko) 2016-06-03 2017-05-30 구강 케어 기구를 위한 헤드 및 구강 케어 기구
CN202310087329.5A CN116058592A (zh) 2016-06-03 2017-05-30 用于口腔护理工具的头部和口腔护理工具
CA3025865A CA3025865C (fr) 2016-06-03 2017-05-30 Tete pour instrument d'hygiene buccale, et instrument d'hygiene buccale
PCT/US2017/034980 WO2017210179A1 (fr) 2016-06-03 2017-05-30 Tête pour instrument d'hygiène buccale, et instrument d'hygiène buccale
AU2017275497A AU2017275497B2 (en) 2016-06-03 2017-05-30 Head for an oral care implement and oral care implement
KR1020187034890A KR102297299B1 (ko) 2016-06-03 2017-05-30 구강 케어 기구용 헤드 및 구강 케어 기구
JP2018563162A JP6833874B2 (ja) 2016-06-03 2017-05-30 口腔ケア器具用のヘッド及び口腔ケア器具
CA3025772A CA3025772C (fr) 2016-06-03 2017-05-30 Tete pour instrument d'hygiene buccale, et instrument d'hygiene buccale
AU2017273526A AU2017273526B2 (en) 2016-06-03 2017-05-31 Head for an oral care implement and oral care implement
CN201780034447.2A CN109219372A (zh) 2016-06-03 2017-05-31 用于口腔护理工具的头部和口腔护理工具
CN202310704015.5A CN116849447A (zh) 2016-06-03 2017-05-31 用于口腔护理工具的头部和口腔护理工具
JP2018562922A JP7086865B2 (ja) 2016-06-03 2017-05-31 口腔ケア器具用のヘッド及び口腔ケア器具
KR1020187034888A KR102216259B1 (ko) 2016-06-03 2017-05-31 구강 케어 기구를 위한 헤드 및 구강 케어 기구
CA3025824A CA3025824C (fr) 2016-06-03 2017-05-31 Tete pour instrument d'hygiene buccale, et instrument d'hygiene buccale
PCT/US2017/035188 WO2017210282A1 (fr) 2016-06-03 2017-05-31 Tête pour instrument d'hygiène buccale, et instrument d'hygiène buccale
AU2017273722A AU2017273722B2 (en) 2016-06-03 2017-06-01 Filament for an oral care implement and oral care implement
KR1020187034885A KR102223596B1 (ko) 2016-06-03 2017-06-01 구강 케어 기구를 위한 필라멘트 및 구강 케어 기구
CN201780034407.8A CN109310202B (zh) 2016-06-03 2017-06-01 用于口腔护理工具的长丝和口腔护理工具
CA3025876A CA3025876C (fr) 2016-06-03 2017-06-01 Filament pour instrument d'hygiene buccale, et instrument d'hygiene buccale
PCT/US2017/035384 WO2017210389A1 (fr) 2016-06-03 2017-06-01 Filament pour instrument d'hygiène buccale, et instrument d'hygiène buccale
JP2018563179A JP7126952B2 (ja) 2016-06-03 2017-06-01 口腔ケア器具用の毛束、口腔ケア器具用のヘッド及び口腔ケア器具
US15/729,359 US11206916B2 (en) 2016-06-03 2017-10-10 Head for an oral care implement and oral care implement
US15/729,322 US10874205B2 (en) 2016-06-03 2017-10-10 Head for an oral care implement and oral care implement
JP2020174764A JP2021035503A (ja) 2016-06-03 2020-10-16 口腔ケア器具用のヘッド及び口腔ケア器具
JP2021025302A JP2021100576A (ja) 2016-06-03 2021-02-19 口腔ケア器具用のヘッド及び口腔ケア器具
JP2021063747A JP2021106898A (ja) 2016-06-03 2021-04-02 口腔ケア器具用の毛束、口腔ケア器具用のヘッド及び口腔ケア器具
JP2021078642A JP7191449B2 (ja) 2016-06-03 2021-05-06 口腔ケア器具用のヘッド及び口腔ケア器具
JP2021188721A JP2022043044A (ja) 2016-06-03 2021-11-19 口腔ケア器具用のヘッド及び口腔ケア器具

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CN (1) CN109310202B (fr)
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BR9710527A (pt) * 1996-07-25 2000-01-18 Whitehill Oral Tech Inc Escova de dentes com eficiência de abrasão e limpeza aperfeiçoada.
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JP2019517327A (ja) 2019-06-24
JP7126952B2 (ja) 2022-08-29
AU2017273722A1 (en) 2018-12-13
FI3251547T3 (fi) 2024-05-08
CN109310202B (zh) 2024-04-16
KR102223596B1 (ko) 2021-03-05
CA3025876A1 (fr) 2017-12-07
KR20190003714A (ko) 2019-01-09
AU2017273722B2 (en) 2020-01-30
EP3251547A1 (fr) 2017-12-06
CN109310202A (zh) 2019-02-05
WO2017210389A1 (fr) 2017-12-07
CA3025876C (fr) 2021-05-25

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