EP1833654A2 - Procédé de fabrication d' un dispositif d'hygiène dentaire - Google Patents

Procédé de fabrication d' un dispositif d'hygiène dentaire

Info

Publication number
EP1833654A2
EP1833654A2 EP06700001A EP06700001A EP1833654A2 EP 1833654 A2 EP1833654 A2 EP 1833654A2 EP 06700001 A EP06700001 A EP 06700001A EP 06700001 A EP06700001 A EP 06700001A EP 1833654 A2 EP1833654 A2 EP 1833654A2
Authority
EP
European Patent Office
Prior art keywords
core
bristles
core strand
strand
bristle
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.)
Withdrawn
Application number
EP06700001A
Other languages
German (de)
English (en)
Inventor
Ueli Breitschmid
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.)
Curaden International AG
Original Assignee
Curaden International AG
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 Curaden International AG filed Critical Curaden International AG
Priority to EP06700001A priority Critical patent/EP1833654A2/fr
Publication of EP1833654A2 publication Critical patent/EP1833654A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/14—Twisting
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/005—Bristle carriers and bristles moulded as a unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/12—Articles with an irregular circumference when viewed in cross-section, e.g. window profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/13—Articles with a cross-section varying in the longitudinal direction, e.g. corrugated pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/302—Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/345—Extrusion nozzles comprising two or more adjacently arranged ports, for simultaneously extruding multiple strands, e.g. for pelletising
    • 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
    • A46B2200/108—Inter-dental toothbrush, i.e. for cleaning interdental spaces specifically

Definitions

  • the invention relates to a method for producing a cleaning device having at least one core strand and with cleaning elements protruding therefrom, wherein the at least one core strand is extruded with at least one lamella integrally formed thereon by a strand extrusion process and the at least one lamella subsequently divided into sections or bristle elements becomes. Furthermore, the invention relates to a produced by this method cleaning device, in particular an interdental brush. State of the art
  • Interdental brushes are fine brushes for cleaning the tsarine spaces. Conventionally, they are made by placing plastic bristles between two coated metal wires, after which the two metal wires are twisted together so that the bristles are pinched. At the protruding end of the twisted wires, a plastic part may be formed, which can be used interchangeably in a holder (WO 86/02532, Curaden AG). In addition to manually guided interdental brushes, there are also motorized (US 6,253,404 B1, Braun GmbH).
  • JP 3-22723 (Jota Denkirozai) describes an interdental brush that can be made by a two-part injection mold. This technique was used in the
  • a disadvantage of the known injection molding process is the complex production. Making the molds is very costly and the delicate shapes for the bristles are delicate.
  • Sections, slots or protrusions is formed.
  • the bristles are in a first
  • Step extruded as a strand with one or more longitudinally extending lamella Step extruded as a strand with one or more longitudinally extending lamella.
  • the slats are cut by roller blades, so that a filament row is formed.
  • the object of the invention is to specify a method for producing cleaning devices, in particular interdental brushes, which belongs to the technical field mentioned at the outset and which is technically efficient and inexpensive.
  • the cleaning device or the brush (in particular the part with the cleaning elements or bristles) is produced by a Strangextrusions vide.
  • the bristles or cleaning elements are made of the same material as the core strand (which forms the stem) and practically in the same process.
  • the extrusion extrusion process makes it possible to produce the cleaning devices or brushes in a continuously running process. This is a significant advantage over an injection molding process, in which a mold (whose manufacture also means a considerable effort) repeatedly prepared, ejected and emptied.
  • the bristles can be produced by first extruding a continuous lamella and subsequently splitting this lamina into sections or bristles (eg in the cooled state).
  • the length of the lamella can z. B. be limited to the desired length of the bristle head of the brush, without terminating the extrusion process.
  • the region of the extrusion opening which generates the lamella is periodically closed. It makes sense to also divide the slats into individual bristles with means that are suitable for a continuous process.
  • bristle-like cleaning elements and lamellar cleaning elements can be formed.
  • a core strand is to be understood here as that part of the extrudate which forms the stem or at least part of the stem of the brush ("bristle carrier").
  • the core strand may consist continuously of the plastic material with which the extruder is filled. However, it can also have a soul (eg a metal wire or a plastic filament or several such wires or filaments).
  • the extrusion die has a "central" opening through which the core strand is extruded. From this opening at least one slot-shaped opening leads away, through which the plastic lamella is extruded together with (at the same time) the Kemstrang. The slot-shaped opening is thus connected to the "central" opening.
  • the core strand with the bristle elements formed thereon is twisted helically in the longitudinal direction, so that the bristle arrangements formed on the core strand run helically and not on a straight line. Viewed over a certain length of the brush, this results in a regular distribution of the bristles over the circumference. In principle, this replicates the per se proven bristle arrangement of the conventional interdental brushes (in which plastic bristles are fixed between two twisted wires).
  • the slope of the helix created during twisting or twisting makes it possible to set the number of bristles per angular segment.
  • the core strand is twisted with the bristles so far that in a purely linear movement performed the interdental brush substantially no area between two bristles exists, which is not swept by a bristle.
  • the interdental brush is not operated manually, but operated with a motor (as known, for example, from US Pat. No. 6,253,404 B1, Braun GmbH), then the bristle arrangements can also be linear. The twisting of the core strand is therefore not mandatory.
  • the helical arrangement of the bristles can also be produced by initially having two core strands with at least one respective molded bristle arrangement are prepared (as shown above) and that then the two core strands are twisted together. When twisting, care is taken that the bristle arrangements are radially outward in a diametrically opposite direction. Preferably, two linear bristle arrangements are prepared per core strand, which are approximately at 90 ° to each other. During twisting, a brush can be produced in this way, in which there are four helically circulating bristle rows, all of which are in a 90 ° position relative to the angularly adjacent bristle rows.
  • the lamellae or bristles formed on a core strand are arranged in a preferred embodiment not only along a line, but take a wider angular range with respect to the longitudinal axis of the core strand, z. B. an angular range of a maximum of 90 °. In this way, a denser bristle field can be achieved, even if the core strands are not or not so much twisted or twisted. As a rule, an angle range of less than 90 ° will suffice. But it is also conceivable that the angular range is 120 ° - 150 °. The bristles do not all have to have the same length.
  • the core strands should be twisted with a minimum pitch angle.
  • the pitch angle is related to the helix, which describes a twisted Kemstrang. If the helix is elongated, the pitch angle is by definition large. If the pitch angle chosen very small, the core strands are at two points or lines together (comparable to a coil spring).
  • One, two, three, four or more lamellae may be extruded on the core strand, from which one, two, three or four or more rows of bristles are cut.
  • the (thin) lamellar extrusion slots are preferably distributed over the circumference at equal angular intervals (for example two in 180 ° or or four in a 90 ° position relative to one another).
  • the soul in a first method step during the extrusion of the core strand, at least one core of metal or plastic is guided through the extrusion die and embedded in the plastic to be extruded becomes.
  • the soul has a stabilizing function. In particular, it can assist the process step of twisting the core strand by ensuring that the helical shape becomes regular and no material breakage occurs.
  • the soul may be circular in cross-section or strip-shaped.
  • a non-rotationally symmetrical (for example, oval or strip-shaped) cross-section is advantageous because it can better translate the twist into a helix of the bristle rows.
  • the extrusion nozzle has an opening of the shape that its core diameter is greater than the diameter of the core to be embedded, and which is so large that the soul, which is guided through this opening, is completely embedded in the extruded plastic during extrusion ,
  • the lamella molded onto the core strand by the extrusion process is divided into bristle elements.
  • the division of the lamella into individual bristles can advantageously be effected by rotating roll knives.
  • the core strand is pulled through counter-rotating cutting rollers in such a way that the lamella is caught and split by the rotating knives of the rolls.
  • the axis of rotation of the rolls is transverse to the longitudinal axis of the core strand (conveying direction of the extrusion process).
  • the blade is divided by a rotating knife whose cutting blades are arranged like a propeller.
  • the axis of rotation of such a knife is substantially parallel to the longitudinal axis of the core strand.
  • the blade can be divided by a pendulum knife into bristles, wherein the axis of rotation of the pendulum motion is aligned parallel to the longitudinal axis of the core strand.
  • the blade is cut by a wire into bristles by the wire is wound at high speed and still soft plastic helically around the core strand with the integrally formed lamella.
  • the core strand can be twisted in a subsequent third method step.
  • the three method steps are carried out immediately after one another, ie in a continuous process sequence.
  • the twisting of the extruded strand about its longitudinal axis not only produces helical boron but can also improve the stability of the brush.
  • a guide element is provided at a first point of the production process, which fixes the extruded strand orient istsfflessig, and provided at a second (downstream) location of the production process, a twisting device which rotates the extruded strand about its longitudinal axis helically. Under certain circumstances, it may be advantageous to briefly heat the twisted core strand in order to reduce the torsional material stress.
  • the strand is cut to length brush and assembled.
  • the bristles or makeselelente can also be produced in the extrusion by the individual bristles are produced by a discontinuous extrusion.
  • the temporary suspension or prevention of the extrusion in the area of the lamellar opening of the extrusion die creates areas with and without bristles, ie a row of bristles.
  • An arbitrary sequence of bristles can thus be generated by the timing of this extrusion interruption, ie the bristle gap and the "axial" width of the individual bristles (ie the extension of the bristle cross section in the direction parallel to the core strand) can be adjusted with this method.
  • bristle-free sections can be produced at intervals by intermittent extrusion. These sections form the part of the brush, which later serves for attachment to the handle. Thus, by extrusion and without another additional process step, the bristle row and the attachment serving part of the brush are produced in a single process step.
  • the bristle-free sections can also be produced by subsequently removing (cutting off) the lamellas or bristles or cleaning elements in regions.
  • bristles instead of a periodic and uniform sequence of bristles, it is also possible to extrude rows of bristles with variable bristle spacings, in order to produce, for example, bristles. B. generate areas of high or low density of bristles. This proves to be advantageous when specific cleaning requirements are placed on the brush. Under certain circumstances, the angled geometry of interdental spaces can be better taken into account.
  • the "axial" width of the bristle i.e., the extension of the bristle cross section in the direction parallel to the core strand
  • the stiffness of the bristle in the longitudinal direction of the core strand can be increased. With bristles (or lamellae) extended in the core strand longitudinal direction, a cleaning effect similar to flossing can be achieved.
  • closure devices are provided which seal the extrusion die in the region of the lamella opening.
  • the extrusion can be temporarily interrupted.
  • a slit diaphragm is pushed so far into a gap opening, which is located in the region of the slat nozzle opening, until only the actual core strand can be extruded through the extrusion die. After a certain time interval, the slit is pulled out of the gap opening again and a defined long bristle-free section has been extruded.
  • closure devices can be z. B.
  • Iris diaphragms rotationally symmetrically functioning diaphragms
  • revolver diaphragms eccentrically mounted shutter blades, which are pivoted into the extrusion opening
  • Fig. 1 is a schematic representation of a handle with an interdental brush, wherein the brush head is clamped at its end in the handle.
  • Fig. 2 is a schematic representation of the brush head with inner twisted wire core and plastic sheath.
  • Fig. 3 is a schematic representation of an embodiment of the brush with a straight bristle row and attached coupling part.
  • Fig. 4 is a schematic representation of a plastic extrusion plant for carrying out the inventive method.
  • Fig. 5 is a schematic representation of an extrusion die with four slot-shaped radial openings.
  • Fig. 6a, b A schematic perspective view of the extrudate strand before and after cutting the lamellae.
  • Fig. 7 is a schematic representation of a device for rotating the extrudate strand.
  • Fig. 8 A schematic representation of an embodiment in which two separate extrudate strands are produced, which are then twisted into a single strand.
  • Fig. 9 A schematic representation of an extrusion die with sliding closures.
  • FIG. 10 is a schematic representation of a cutting device for producing the
  • FIG. 1 1 A schematic representation of two twisted core strands. 12 is a schematic perspective view of a core strand with an azimuthally extending bristle field.
  • Figure 1 shows a per se known handle 1 with an interdental brush 2.
  • the handle 1 tapers towards a stalk-like portion 3, which is slightly angled towards the end.
  • the angled portion of section 3 is z. B. with a hole (not shown) is provided and has an external thread 4.
  • the interdental brush 2 can be inserted with its attachment portion 5 through the hole of the angled portion 3 and clamped with a union nut 6 (or other fixing) on the handle 1.
  • Figure 2 shows schematically a particularly preferred embodiment of the inventive interdental brush 2. It has a core strand 12, to which bristles 20, 21, 22, etc. integrally (integrally) are formed.
  • the core strand 12 is z.
  • the wires 10, 11 support or generate the twist of the core strand 12.
  • the twisted wires are completely surrounded by a plastic jacket, from which radial bristles 20 , 21, 22 etc. arise.
  • the bristles are over a length of z. B. 10 mm not available. This part of the brush forms a fastening portion 5 and serves for attachment to the handle. 1
  • the bristles 20, 21, 22, etc. form a row of bristles which runs helically around the core strand 12. For the sake of clarity of illustration, only a single bristle row is shown in FIG. In practice, however, at least two, preferably even four rows of bristles will be provided. This helical arrangement allows effective cleaning of the interdental spaces even when the interdental brush is not rotated.
  • 3 shows another embodiment of the interdental brush 30.
  • the fastening section is provided with a stable plastic molding 31 (with a T-shaped end, for example), as it is known as such, for example, from WO 86/02532 (Curaden AG) is.
  • the T-shaped end can be fixed with the union nut 6 on the handle 1 so that unintended withdrawal of the interdental brush 2 is prevented from the handle 1 during use.
  • the interdental brush 30, in contrast to the embodiment of Figure 1 has no soul.
  • the bristles are arranged in two linear bristle rows 32, 33 along the core strand 34.
  • the bristles are all the same length in the embodiment shown.
  • Such a bristle arrangement is suitable for. B. for motorized interdental brushes.
  • the length of the bristles is typically between 0.5 and 1 mm long, so that they can be easily inserted into narrow interdental spaces and have a good cleaning effect. If bristles are too long, the inherent stability and resilience of the bristles may be too low.
  • the bristle density in the longitudinal direction of the core strand should be as high as possible. Typically, a bristle density of at least 5 (eg 8-10) bristles per millimeter is desired. But it can also be less bristles, depending on the diameter of the respective bristle. In a preferred embodiment, the individual bristles are rod-shaped and have a diameter of a fraction of a millimeter (eg 1/10 mm). Thus, the bristle is resistant enough to achieve a cleansing effect and yet flexible enough to cause any damage in the tooth area.
  • FIG. 4 shows a strand extrusion apparatus with which the above-described interdental brushes or brush heads can be produced.
  • the required starting materials 42 are fed in a conventional manner via a hopper 41 to the extruder 40 and heated there (heating element 43).
  • the starting materials may, for.
  • PE polyethylene
  • PP polypropylene
  • PET polyethylene terephthalate
  • PA polyamine
  • rubber or rubber are also conceivable are rubber or rubber.
  • the starting material according to the functional mixed principle of a meat grinder homogenized and compressed and transported to the extrusion die 45.
  • the plastic extrusion compound thus prepared is extruded through the extrusion die 45 into a rod-shaped extrudate strand 47 with endless lamellae.
  • two wires 61, 62 which form the core of the core strand of the interdental brush, are simultaneously unwound from the wire roll 46 and passed through the extrusion die 45 during extrusion.
  • FIG. 5 shows the extrusion nozzle 45 in the axial cross section.
  • the extrusion opening 50 has a central passage 51, to which four radially outwardly extending, slot-shaped passages 52, 53, 54, 55 follow.
  • the central passage 51 is z. Circular, the slot-shaped passages 52, 53, 54, 55 have a width less than the diameter of the central passage 51.
  • the slot-shaped passages 52, 53, 54, 55 have one substantially over their entire length constant width. Their shape determines the cross section of the slats to be extruded, from which the bristles or cleaning elements are formed.
  • FIG. 6a shows a schematic perspective view of the extrudate strand 47.
  • the core strand 60 with the two wires 61, 62 and the four integrally formed endless lamellae 63, 64, 65, 66 are shown.
  • the endless fins 63, 64, 65, 66 are to be divided into individual bristles.
  • cutting rollers 48.1, 48.2 and 49.1, 49.2 can be used for this purpose.
  • the cutting rollers have circumferentially mounted blades 48.1 1, 48.21, 49.1 1, 49.21.
  • the two cutting rollers 48.1, 48.2 are used for dividing the two endless plates 63, 65. They are arranged and designed so that the core strand 60 and the two endless plates 64, 66 can pass freely between, while with the knives 48.1 1, 48.21 the endless lamellae 63 , 65 are cut.
  • the second pair of cutting rollers 49.1, 49.2 generates the cuts on the other two endless disks 64, 66.
  • the axes of rotation of the cutting rollers 49.1, 49.2 are perpendicular to the axes of rotation of the cutting rollers 48.1, 48.2.
  • the endless lamellae 63, 64, 65, 66 are thus cut at regular intervals after the extrusion nozzle, so that a row of bristles 63.1, 63.2, 63.3 or 64.1, 64.2, 64.3 and 65.1, 65.2, 65.3 and 66.1, 66.2, 66.3, respectively, as shown in FIG. 6b. (The distances between the bristles are greatly exaggerated in Figure 6b.) The aim is to keep these distances as small as possible, eg similar to the teeth of a comb).
  • the core strand 60 is finally helically twisted, so that the rows of bristles extend helically along the shell side of the core strand 60 (as indicated in FIG. 2).
  • Figure 7 shows a schematic representation of a device which can rotate the extrudate strand 47 continuously.
  • the extrudate strand 47 is passed between two retention rollers 70, 71. These ensure that the extrudate strand 47 maintains a predetermined orientation with respect to its longitudinal axis.
  • a rotating device 72 is provided, which rotates the extrudate strand 47 about its longitudinal axis.
  • the twisting device 72 may be realized by two retaining rollers 73, 74, which are rotated as a pair about the longitudinal axis of the extrudate strand.
  • the holding rollers 73, 74 hold the extrudate strand (during longitudinal feeding) orientationally and therefore force it to twist during rotation.
  • a material fixation by heating, by ultraviolet radiation or by chemical treatment of the plastic can take place in the area between the retaining rollers 70, 71 and the retaining rollers 73, 74.
  • the extrudate strand 47 is cut with a cutting device 75 to a desired piece length to form interdental brushes.
  • the endless lamellae 63, 64, 65, 66 can be removed in sections already after the extrusion. It can, for. B. in the cutting rollers 48.1, 48.2, 49.1, 49.2 be provided a cutting profile, which at regular intervals gaps in the endless plates 63, 64, 65, 66 intersects according to the required length of the attachment portion.
  • the bristles are removed in sections before the cutting device (eg with a laser).
  • the extrudate strand 47 can also be wound up on a spool for shipping, so that the assembly of the interdental brush takes place at another location.
  • Figure 8 shows an embodiment in which first two separate extrudate strands 80, 81 are made, which are then twisted into a single strand.
  • Each of the two extrudate strands 80, 81 has a core strand 88, 89 with z. B.
  • two endless lamellae 82, 83 and 84, 85 which are at an angle of about 90 ° to each other. If the two extrudate strands 80, 81 are combined, the result is an overall image in which four endless blades 82, 83, 84, 85 project from the twisted core strand in a regular, star-shaped arrangement.
  • both core strands 88, 89 have a flattened side 86, 87.
  • the core strands can in cross section z. B. strip-shaped, rectangular or semicircular. If a strong twist is chosen (i.e., a small pitch angle of the twist), it may suffice for a sufficiently dense bristle field if only one bristle strand (i.e., a sliced fin) is provided.
  • FIG. 9 shows an extrusion die 90, which is provided with sliding closures 91, 92, 93, 94.
  • the sliding closures 91, 92, 93, 94 can be electronically controlled extended and retracted.
  • the slot-shaped passages 95, 97 are concealed, so that although the core strand, but not the lamella can be extruded.
  • the extended state sliding closures 92, 94
  • the slot-shaped passages remain 96, 98 and the lamellae are extruded with.
  • the slide fasteners 91, 92, 93, 94 are operated synchronously, ie all four are retracted and extended simultaneously.
  • the bristles are formed.
  • the plastic is extruded quasi intermittently.
  • the mentioned slide closures 91, 92, 93, 94 can also be used to form bristle-free fastening sections.
  • slidable sliding closures can also be provided in the circumferential direction.
  • a rotary shutter Such one essentially consists of a disk which is arranged directly on the output side of the extrusion nozzle and in principle has the same openings (ie a central passage and, for example, four slot-shaped, radially running passageways). The disk is arranged coaxially with the extrusion nozzle and is rotatably mounted around the central opening. By turning back and forth (or by continuously rotating) the rotary shutter, the orifices of the extrusion nozzle are periodically opened and closed.
  • the Drehverschi uss may also be formed in the manner of a ring having an inner diameter corresponding to the staked by the slot-shaped nozzle areas circular area and which has four pointing to the center finger or knife. When the rotary shutter is rotated, the four blades or fingers sever the slats extruded from the slit-shaped openings.
  • FIG. 10 shows a cutting device 100, which serves to produce the bristles and is designed in a similar manner to the rotary closure just described. It is first an extrudate, as shown in Figure 6a, generated and subsequently pulled by the cutting device.
  • the cutter has a fixed guide passage 101 which is adapted to the cross-sectional shape of the extrudate. That is, the guide passage 101 has a similar shape to the extrusion nozzle 90 (central passage and four radially-passing slot openings).
  • the rotary blade 102 On the output side of the guide passage 101, the rotary blade 102 is arranged. It has an outer ring 102 and an inner free area, in which four cutting fingers 103, 104, 105, 106 protrude substantially radially.
  • the cutting fingers 103, 104, 105, 106 are oriented slightly obliquely to the radial direction so that the blades of the extrudate are cut in from the outside in when the rotary blade 102 is rotated (in the arrowed direction).
  • the core strand can be briefly heated after or during the twisting (for example by infrared radiation).
  • Figure 1 1 shows a section in the longitudinal direction of an inventive interdental brush.
  • Two core strands 1 10, 1 1 1 1 are closely twisted around each other.
  • each core strand 1 10, 1 1 1 has a metal wire 1 12, 1 13 as a soul.
  • At each core strand 1 10, 1 1 1 is an extruded row of bristles 1 14, 1 15 formed, which may be made in the manner described above.
  • the two Kemstrzane 1 10, 1 1 1 1 together form a stem of an interdental brush, of which the bristle rows 1 14, 1 15 are substantially radially (with respect to the stem axis) to the outside.
  • the bristle rows are helical and form z.
  • B. a cylindrical "bristle space" (which surrounds the stem axis and which defines the cleaning area of the brush).
  • the twist is chosen so narrow that each of the core strands 1 10, 1 1 1 contacted the other at least two places (or two lines of contact 1 16, 117).
  • Slope angle ß is therefore as small as possible, z. B. less than 20 °, in particular 10 ° - 15 °.
  • each individual core strand can preferably be impressed with an additional inner twist. In this way it can additionally be ensured that the rows of bristles project outwardly in the radial direction with respect to the shaft axis of the interdental brush.
  • a metal wire core and a plastic fiber or a plastic wire may be provided as the core of the strand. It can also be worked without a wire core. That is, the core strand can be made homogeneous from a material.
  • FIG. 12 shows that the core strand 120 can be equipped not only with a single row of bristles, but with a plurality of bristle rows 121, 122, 123, 124, etc., which has a bristle field in an angular range ⁇ of, for example,. B. define a maximum of 90 °.
  • the "cylindrical bristle space" of the interdental brush on the whole is very dense.
  • the bristles do not need to have a constant cross section. They can also rejuvenate to their outer end.
  • the shape can be set almost freely through the extrusion opening.
  • the bristle density (in the longitudinal direction) can also be varied. It is therefore also possible to produce specially adapted to specific purposes, irregular bristle fields.
  • the extension of the bristle cross sections in the core strand longitudinal direction can be greater than that in the circumferential direction of the core strand, ie the bristles can be sheet-shaped or band-shaped.
  • the plastic sheath in the region of the attachment section can also be completely omitted or removed. Such an exposed soul can then be embedded in a solid plastic molding or serve directly for attachment to the handle.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)

Abstract

L'objectif de l'invention est de produire une brosse (2), en particulier une brosse interdentaire. A cet effet, deux rames de base (80, 81) sont extrudées, au moyen d'un procédé d'extrusion, comprenant au moins une lamelle (82, 83, 84, 85) préformée. Les lamelles sont divisées ultérieurement en éléments de brosserie. La brosse interdentaire peut également être produite à l'aide d'un procédé d'extrusion de rames intermittent, selon lequel au moins une rame de base est extrudée à l'aide d'au moins une rangée de poils préformés. La brosse obtenue selon ledit procédé est tordue ou torsadée dans une autre étape du procédé, de façon à ce que les poils soient disposés dans le sens longitudinal de la brosse sous forme hélicoïdale.
EP06700001A 2005-01-05 2006-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire Withdrawn EP1833654A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06700001A EP1833654A2 (fr) 2005-01-05 2006-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP05405002A EP1679017A1 (fr) 2005-01-05 2005-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire
PCT/CH2006/000007 WO2006072190A2 (fr) 2005-01-05 2006-01-05 Procede pour produire un appareil de nettoyage
EP06700001A EP1833654A2 (fr) 2005-01-05 2006-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire

Publications (1)

Publication Number Publication Date
EP1833654A2 true EP1833654A2 (fr) 2007-09-19

Family

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EP05405002A Withdrawn EP1679017A1 (fr) 2005-01-05 2005-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire
EP06700001A Withdrawn EP1833654A2 (fr) 2005-01-05 2006-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP05405002A Withdrawn EP1679017A1 (fr) 2005-01-05 2005-01-05 Procédé de fabrication d' un dispositif d'hygiène dentaire

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Country Link
EP (2) EP1679017A1 (fr)
WO (1) WO2006072190A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE535050C2 (sv) * 2010-06-03 2012-03-27 Tigran Technologies Ab Publ Rengöringsanordning
DE102012015664A1 (de) * 2012-08-09 2014-02-13 Interbros Gmbh Interdental-Reiniger
DE102013010782A1 (de) 2013-06-28 2014-12-31 Interbros Gmbh Interdentalreiniger und Verfahren zu seiner Herstellung
JP6569273B2 (ja) * 2015-03-31 2019-09-04 サンスター株式会社 歯間清掃具
FR3089766B1 (fr) * 2018-12-18 2021-09-24 Oreal Organe d’application d’un produit et procédé de fabrication dudit organe d’application

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US4186239A (en) * 1976-12-06 1980-01-29 Berkley & Company, Inc. Monofilament weed cutters
JPS6137153A (ja) 1984-07-31 1986-02-22 株式会社興和総合研究所 口腔清掃補助用具及びその製法
CH663717A5 (de) 1984-10-25 1988-01-15 Curaden Ag Vorrichtung zum reinigen der zahnzwischenraeume.
JPH0720083B2 (ja) 1989-06-20 1995-03-06 富士通株式会社 選択呼出方式
JPH03289906A (ja) * 1990-04-05 1991-12-19 Mitsuo Ishikawa 歯ブラシ
US5435709A (en) * 1993-07-07 1995-07-25 Gemini Braids, Inc. Apparatus for preparing chemical compounds to be mixed for reaction
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AU7645598A (en) 1997-04-22 1998-11-13 Braun Aktiengesellschaft Electrically driven dental scaling apparatus
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JP3824041B2 (ja) 1998-12-04 2006-09-20 株式会社三▲しゅう▼プレシジョン 歯間清掃具及びその製造方法
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Also Published As

Publication number Publication date
WO2006072190A2 (fr) 2006-07-13
EP1679017A1 (fr) 2006-07-12
WO2006072190A3 (fr) 2006-08-31

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