• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A device (1) is used for making brushes with injection coated bristle tufts (4), the device having at least one injection molding unit with an injection mold (1,1a) for injection coating partial bodies brush (5) lined with tufts of bristles (4). The injection mold (1, 1a) has a first mold half (2) for receiving one or more brush partial bodies (5) furnished with tufts of bristles (4) as well as a second mold half (3.3a ) which rests directly or indirectly on the region of the rear fastening ends (7) of the pile tufts (4) and forms at least in the peripheral region individual fastening ends (7) of the tufts bristles one or more cavities for the injection potting material. (fig 3)
    公开号:BE1018532A3
    申请号:E2007/0580
    申请日:2007-12-05
    公开日:2011-03-01
    发明作者:Bernhard Rees；Matthias Schubnell
    申请人:Zahoransky Ag；
    IPC主号:
    专利说明:

    The invention relates to a device for manufacturing brushes with tufts of bristles coated by injection, the device having at least one injection molding unit with an injection mold for injection molding. injection-coating partial brush bodies filled with tufts of bristles.
    The invention further relates to a brush with tufts of bristles coated by injection and with a brush body consisting of several partial bodies, which is manufactured by means of the device according to the invention.
    In the case of the various devices and methods known for making brushes with tufts of spray-coated bristles, penetration of injection material between the tufted pile filaments and through the tufts is always problematic. When the injection material is under very high pressure, it can even penetrate so far that it is visible later on the finished brush and is thus the source of rejects. This can cause injury, especially in the case of toothbrushes, which is why these surpluses are unacceptable.
    The object of the present invention is to provide a device for making brushes and a brush made thereafter, the penetration of injection material between the pile tuft filaments being surely avoided during the injection process.
    To solve this problem, it is proposed that the injection mold has a first mold half to receive one or more partial bristle-filled brush bodies and a second mold half which rests in the area of the attachment ends. rear tufts of bristles by leaning directly or indirectly thereon and forms at least in the peripheral region of the different ends of the tufts of bristles one or more cavities for the coating material by injection.
    An intermediate layer which serves in practice exclusively to create a seal between the tufts fixing ends and the partial brush body and to fix the tufts of bristles is injected with this injection mold. In this case, the attachment end, usually provided with a melt-molded head, of the relevant tuft of bristles is surrounded by the injection material and is thus sealed and securely retained after cooling the material of the invention. injection. The second partial body may be limited to the region of the bristle area on the back side and terminate with the tufts of bristles. It is therefore preferably provided only a comparatively thin injection layer which also avoids, inter alia, unnecessary thickening of the brush body. This is important especially in the case of toothbrushes.
    Due to the impact of the second half of the mold on the back side of the tufts of bristles, the tufts of bristles are pressed with their attachment ends against the partial brush body during the injection process and therefore are not raised with their fixation head during the injection process so that there is an establishment ensuring the sealing of the attachment ends at the partial brush body, which prevents penetration of the injection material between the tuft filaments of fur.
    For a better seal, the through-holes in the first sub-body can be bevelled on their side facing the fastening head concerned at the fastening end so that a larger bearing surface is formed for the head of the fastener. fixing and therefore a wider sealing area.
    Since this intermediate layer must not be visible on the finished brush, a high quality injection with a high injection pressure is therefore not absolutely necessary for this purpose. This also promotes high quality production of the brushes without penetration of the injection material between the filaments.
    For the second partial body, it is possible to use another injection material than for the other partial bodies of the brush. In particular, the injection material for the second partial body may be specially adapted to the sealing and incorporation requirements of the tufts ends of bristles.
    It is also possible to vary the injection pressure during the injection process and, in this case, to start first with low pressure and to switch to a higher subsequent pressure as little as possible before solidification. injection material so that the material firstly injected and partly cooled compact more. In some cases, an improved seal between the tufts fixing ends and the partial brush body could thus be created without impact on the back side of the tufts fixing ends.
    After the injection of the second partial brush body as an intermediate layer for sealing the tufts of bristles with the first sub-body in the passage holes of which the tufts of bristles are located, a third sub-body may be injected to complete or terminate. the brush body.
    According to a particularly advantageous improvement of the invention, the first brush partial body has, at least on the rear side following its passage holes for the tufts of bristles, a sealing element wrapping each time a section of the ends. fixing tufts of hair.
    These sealing elements can be suitably deformed under the influence of the injection pressure to seal the tufts of bristles and are configured in particular as annular projections or sheaths.
    In connection with the sealing support, on the rear side, the fixing head of the tufts of hair or the similar thickening at the level of the projection concerned, it is obtained under the influence of the injection pressure that the sheaths are compressed radially and constricted so that the sealing effect is also enhanced as the injection pressure increases.
    Thus, it is particularly safe to prevent the injection material from entering the through holes and between the filaments of the tuft of bristles upon injection of the second partial brush body. The injection pressure is therefore consistent with the construction measurements, the deformability of the sealing elements is in particular determined so that the ends of fixing the tufts of bristles are wrapped in a sealing manner.
    The tufts of hair rest with their thick mushroom-shaped heads against the annular projections or may also somewhat engage in these projections, the annular projections may also be beveled so that here too a good seal is obtained.
    In order to obtain a good seal with comparatively low injection pressures, the annular projections may have tapering walls towards their free ends so that there is better flexibility of the projections. The sealing elements may also have a wall which is each time configured in practice to deform in whole or in part under the influence of the injection pressure, so that in whole or in part a wall thickness for example reduced depending on the expected injection pressure. In the case of deformability of the sealing elements, a long sealing zone is formed in practice, whereas in the case of several partial weakening zones of the wall, several tightening zones and zones are formed. are formed over the extent of the sheath-shaped sealing element. In the case of several sealing zones, these can also be configured differently flexible.
    For optimal use of the features described above, it is also conceivable to use tufts of bristles that do not have a formed head, since the deformable sealing zones and a controlled increase in the injection pressure can already lead to to a sufficient seal. What is also essential in this case is the effect of self-consolidation during the deformation of the sealing zones as a function of the pressure.
    The initial injection pressure may, in this case, be sized to separate the filaments from the tufts fixing ends that protrude from the sealing elements in the mold cavity, while the initial injection pressure, a transition injection pressure or the starting injection pressure and / or the subsequent pressure is dimensioned for sealing in the region of the sealing elements and, in doing so, for their deformation and tightening.
    When injecting the injection material to impregnate the partial brush body having the tufts of bristles, the tufted bristle filaments that follow the sealing elements and protrude into the mold cavity are discarded and the sealing zones are preferably deformed at the same time so that the injection material actually penetrates in a desired manner between the inner filaments of the tuft of bristles for the purpose of spacing but is prevented from penetrating further by the tightening of the sealing zones.
    The filaments spaced apart at the inner fixing end of the bristle tufts provide reliable fixation of the tufts of bristles in the finished brush, as is also the case for tufts of bristles provided with mushroom-shaped attachment heads. It is thus possible to economize on a separate operation consisting of giving the tufts of hair a mushroom shape to the ends of attachment.
    The projections or annular sheaths also serve to enlarge the guide length for the tufts of bristles. They can also be provided for this purpose, in addition to the rear following the passage holes of the first brush partial body, at the front following the passage holes.
    The support at the rear of the tufts fixing ends can be exerted directly by the second mold half, its inner wall having a direct impact on the ends of fixing the tufts of bristles when the mold is closed.
    But it is also possible to provide on the inner wall of the second mold half hollow and / or raised formations which are arranged according to the position of the different ends of attachment.
    The hollow formations in the mold wall of the second mold half may be formed by depressions and the raised formations by rod-like or rib-shaped protuberances on the mold wall.
    In this case, the recessed and / or raised formations may be adapted, if necessary, to the upper end portion of the tufts fixing ends, in particular to their attachment heads.
    According to an improvement of the invention, there may be provided protuberances movably connected to the second mold half and intended to have a direct impact on the tufts fixing ends, which protuberances are configured in a resilient manner in the direction opposite to the direction of impact on the tufts fixing ends.
    The impact points can, in this configuration, bear against the fixing ends during the closing of the mold and then have an impact on them thanks to the spring force. Even in the case of different positions of the fixing ends, one thus obtains a uniform compression, and it is not necessary on the other hand to adapt to different brush patterns with respect to the position of the fixing ends. The flexible protuberances which are preferably configured as rods may be provided with springs individually or in groups to be able to regulate the compression for each individual head at the tufts fixing end.
    The invention will be explained in more detail below with its essential details based on the drawings.
    It is shown schematically on:
    Fig. 1 an injection mold with a first half of the mold and a partial brush body filled with tufts of bristles, inserted therein, and a second mold half placed over it,
    Fig. 2 the injection mold shown in FIG. 1 in the closed state,
    Fig. 3 the injection mold shown in FIG. 2 with a second injected brush partial body,
    Fig. An injection mold with a first half and a second mold half, the second mold half being provided with flexibly resilient impact protuberances,
    Fig. The injection mold shown in FIG. 4 in the closed state, and
    Fig. 6 the injection mold shown in FIG. 5 with a second injected brush partial body.
    An injection mold 1 shown in FIG. 1 is part of an injection molding device and has a first mold half 2 and a second mold half 3. The mold is shown in the open position in FIG. 1. The first mold part 2 serves to receive a first bristle partial body 5 filled with tufts of bristles 4. It has holes 6 for tufts of bristles in which the tufts of bristles 4 are inserted. The tufts of bristles 4 have at their attachment ends 7 heads 8 shaped mushroom obtained by fusion.
    The second mold half 3 is formed so as to rest in the closed state of the injection mold (Fig. 2) in the region of the rear attachment ends 7 of the tufts of bristles 4 relying on them, tufts of bristles being displaced from the position shown in FIG. 1 and pushed into the through holes 6 until the heads 8 are closely adjacent to the first brush partial body 5.
    In the exemplary embodiments shown, there are provided as guiding and sealing elements ring-shaped or sheath-shaped protrusions following the through holes 6 on the rear side. These projections 9 are connected to the partial brush body 5 to be one with it. The heads 8 of the fastening ends 7 of tufts of bristles are narrow adjacent to the free ends of the projections 9. They are subject to this effect to the impact of the second half of the mold.
    In the exemplary embodiment shown in FIGS. 1 to 3, the inner mold wall 10 of the mold half 3 has protuberances 11 which rest, when the mold is closed, on the heads 8 of the fastening ends 7 of tufts of bristles and have an impact on these . The protuberances 11 are adapted to the respective position of the heads in the sealing position, in particular also in the case of different positions in height of the heads 8 of tuft of bristles.
    The projections 9 provide on the one hand a longer guide for the tufts of bristles 4 so that they are maintained exactly in their predefined position. At the same time, these protrusions 9 are also configured as sealing elements, a better sealing against the penetration of injection material being already provided by the greatest guide length, and the protrusions 9 are in particular configured so deformable to be more strongly pressed against the tufts of bristles 4 in the passage holes 6 under the influence of the injection pressure and thus form a seal depending on the injection pressure. Therefore, the higher the injection pressure, the more the projections 9 are strongly compressed and tighten more and more against the tufts of bristles 4. Their individual filaments are, in doing so, tightly pressed against each other, which prevents penetration of the injection material.
    In FIG. 3, the deformation in the form of retightening 15 of the projections 9 under the influence of the injection pressure during the injection of a second partial brush body 12 for tightly surrounding the tuft-fixing ends is clearly seen. of hair.
    The second brush sub-body essentially terminates with the tuffer attachment ends 7 and thereby forms a comparatively thin injection layer which is then further injection-coated with a third partial brush body to complete or terminate. the brush body.
    Figs. 4 to 6 show an alternative embodiment of an injection mold 1a, the first mold half 2 of which is configured as shown in FIGS. 1 to 3 and serves to receive the first brush partial body 5 with tufts of bristles inserted therein.
    The second mold half 3a has, in order to exert an impact on the fastening ends 7 of the tufts of bristles, in the second mold half 3a, shown schematically, displaceable rods 13 which are supported by springs 14. The elastic spring stroke available has an impact on the fastening ends 7 at different heights, as can be seen in FIGS. 4 and 5. On the one hand, this makes it possible to compensate for tolerances but, on the other hand, it is possible to use also the second mold half 3a with the rods placed therein in a displaceable manner for patterns of different brushes in which the fixing ends advance to different degrees.
    Fig. 4 shows the injection mold 1a in the open state, while the injection mold in FIG. 5 is closed and thus ready for the introduction of injection material for the second brush partial body 12. It can also clearly be seen here that the rod 13 which has an impact on the attachment end 7 higher with the more big head 8 is a more compressed.
    In FIG. 6, the injection process for the second partial brush body 12 is finished and it can clearly be seen here, under the influence of the injection pressure, the ring-shaped or sheath-shaped projections 9 have have been compressed during the injection of the second partial brush body and press tightly by tightening the bristle section surrounded by them at the fixing end 7.
    权利要求:
    Claims (20)
    [1]
    Apparatus for producing brushes with tufts of bristles (4) coated by injection, the device having at least one injection molding unit with an injection mold (1, 1a) for injection coating partial brush bodies ( 5) filled with tufts of bristles (4), characterized in that the injection mold (1, 1a) has a first half mold (2) for receiving one or more partial brush bodies (5) filled with tufts of hair (4) and a second mold half (3, 3a) which rests in the region of the rear attachment ends (7) of the tuft of bristles (4) bearing directly or indirectly on them and forms the less in the peripheral region of the individual tufted attachment ends (7) of one or more cavities for the injection-coating material.
    [2]
    2. Device according to claim 1, characterized in that the rear support exerted directly or indirectly by the second mold half (3) on the fastening ends (7) of tufts of bristles having heads (8) preferably molded by melting has recessed formations and / or relief (11) at the position of the fastening ends (7).
    [3]
    3. Device according to claim 1 or 2, characterized in that the recessed formations are formed by depressions in the mold wall (10) of the second mold half (3) which are adapted to the shape of the upper part. on the head side of the fastening ends (7) tufts of bristles.
    [4]
    4. Device according to claim 2 or 3, characterized in that the relief formations are formed by protuberances, preferably rod-shaped or rib-shaped, on the mold wall (10) of the second mold half (3). ) which have appropriate impact faces, if any, at the upper end side of the fastening ends (7).
    [5]
    5. Device according to one of claims 1 to 4, characterized in that there are provided protuberances (13) movably connected to the second mold half (3) and intended to have a direct impact on the ends of fixing (7) tufts of bristles, which protuberances are configured so as elastically spring in the direction opposite to the direction of impact on the fastening ends (7) of tufts of bristles.
    [6]
    6. Device according to claim 5, characterized in that the projections movably connected to the second mold half (3) are formed by rods (13) supported by means of springs (14).
    [7]
    7. Device according to one of claims 1 to 6, characterized in that the injection pressure is dimensioned to deform sealing elements (9) respectively following, on the rear side, the through holes (6). tufts of bristles of the partial brush body (5) and wrapping a section of the tufts fixing ends (7) and tightly wrapping the tufts of bristles (4).
    [8]
    8. Device according to one of claims 1 to 7, characterized in that the initial injection pressure is lower than a subsequent pressure until just before the solidification of the injection material.
    [9]
    9. Device according to claim 8, characterized in that the initial injection pressure is dimensioned to remove filaments of the fastening ends (7) of tufts of bristles which protrude beyond the sealing elements (9) in the mold cavity and in that the initial injection pressure and / or the subsequent pressure is dimensioned for sealing purposes in the region of the sealing elements (9) and, in doing so, for deformation thereof and their tightening.
    [10]
    10. Brush with tufts of bristles (4) coated by injection, in particular manufactured by means of a device according to one of claims 1 to 9, with a brush body which consists of several partial bodies, characterized in that that the brush has a brush body consisting of at least three partial bodies, in that the first sub-body (5) has through holes (6), a second sub-body (12) for sealingly sealing the ends for fastening (7) tufts of bristles as well as a third partial body for completing or terminating the brush body are provided.
    [11]
    11. Brush according to claim 10, characterized in that the fixing ends (7) of the tufts of bristles (4) are formed by heads (8) molded by fusion.
    [12]
    12. Brush according to claim 10 or 11, characterized in that the through holes (6) in the first partial body are beveled on their side facing the attachment ends (7) tufts of bristles.
    [13]
    13. Brush according to one of claims 10 to 12, characterized in that the first brush sub-body (5) has, each time, for the tufts of bristles (4), a sealing element (9) enveloping a section fastening ends (7) of tufts of bristles on the rear side following its through holes (6).
    [14]
    14. Brush according to claim 13, characterized in that the sealing elements (9) are deformably configured under the influence of the injection pressure to tightly wrap the tufts of bristles (4).
    [15]
    15. Brush according to claim 13 or 14, characterized in that the sealing elements are configured as projections (9) or annular sheaths.
    [16]
    16. Brush according to one of claims 13 to 15, characterized in that the sealing elements (9) have a wall which is each time configured in whole or in part to deform under the influence of the pressure of 'injection.
    [17]
    17. Brush according to claim 15 or 16, characterized in that the annular projections (9) have walls tapering toward their free ends.
    [18]
    18. Brush according to claim 10 or 12 to 17, characterized in that the ends of attachment (7) of tufts of bristles have adjacent to the sealing elements (9) filament ends spaced apart and filled at least in part with injection material of the second partial body (12) in the gaps.
    [19]
    19. Brush according to one of claims 10 to 18, characterized in that there is provided for the second partial body (12) another injection material for the other partial bodies (5) of the brush.
    [20]
    20. Brush according to one of claims 10 to 19, characterized in that the second partial body (12) terminates approximately with the attachment ends (7) of tufts of bristles.
    类似技术:
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    FR2667500A1|1992-04-10|Method for moulding ear devices, such as noise protection devices or ear plugs, and devices thus obtained
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    同族专利:
    公开号 | 公开日
    DE102006059250A1|2008-06-19|
    DE102006059250A9|2011-03-24|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE191657C|
    US2317110A|1938-08-04|1943-04-20|Du Pont|Method of making brushes|
    DE921985C|1951-11-20|1955-01-07|Walter Wessel Jun|Elastic brush|
    DE4420757A1|1994-06-15|1995-12-21|Zahoransky Anton Gmbh & Co|Brush mfg. machine with bristle tuft feeder|
    WO2006095937A1|2005-03-11|2006-09-14|Young-Jun Kwon|Toothbrush having pressure relief unit and method of producing the same|
    DE102010044921B4|2010-09-09|2020-09-17|Zahoransky Formenbau Gmbh|Device for making brushes and brushes|
    WO2012174066A2|2011-06-15|2012-12-20|The Gillette Company|Oral care instrument|
    EP2886289B1|2013-12-19|2016-08-03|The Gillette Company|Method to manufacture an injection molded component and injection molded component|
    法律状态:
    2014-06-30| RE| Patent lapsed|Effective date: 20131231 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE200610059250|DE102006059250A1|2006-12-15|2006-12-15|Arrangement for manufacturing brushes has injection tool with first half for holding brush parts with bristle bundles, second half in contact with bundle fixing ends forming cavities for injection material near individual fixing ends|
    DE102006059250|2006-12-15|
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