• 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:
    Stamp for melting and locally pressing fiber bundles, whereby the stamp can be heated, characterized in that the stamp (1) on its contact surface (2) where the stamp presses fiber bundles (4) on a holder (3), at least partially made of carbon exists.
    公开号:BE1018061A6
    申请号:E200800178
    申请日:2008-03-25
    公开日:2010-04-06
    发明作者:
    申请人:Gb Boucherie Nv；
    IPC主号:
    专利说明:

    Stamp for pressing fiber bundles.
    This invention relates to a stamp for pressing on coastal fiber bundles onto a holder, in particular for fiber bundles of brushes.
    It is known that a brush consists of a body to which a quantity of fiber bundles is attached. Typically, the fiber bundles are attached to a holder that is partially or entirely part of the brush body or, in some cases, may be the brush body itself.
    !
    To this end, the holder contains holes in a certain pattern, the diameter of the holes depending on the thickness of the fiber bundles, whereby holes of different diameters can be provided.
    Where brushes used to use fiber bundles made of natural materials, it is now common for the fibers in the fiber bundles of industrially manufactured brushes to be made of plastic. A typical example is polyethylene terephthalate, polyvinyl chloride, polypropylene or nylon.
    It is known that in order to fix the fiber bundles on the holder, use can be made of fixation techniques that make use of metal staples or plates. In more modern techniques, use is made of so-called anchorless techniques, as disclosed, for example, in EP 0,972,465.
    Fiber bundles are herein placed in a holder by a device and the holder is brought via a turntable to a so-called melting module for fixing the fiber bundles by fusing the ends of the fiber bundles protruding from the holder.
    This melting module can use various techniques, for example ultrasonic welding of the fiber bundles. Another simpler technique is the mechanical pressing or pressing of the fiber bundles on the holder with the aid of a heated stamp.
    The ends of the fiber bundles are hereby fused locally. If the ends are long enough, even a molten film can arise between the heated punch and the container because the ends of different fiber bundles fuse together. The stamp is then withdrawn and curing of the molten ends occurs.
    Typically these stamps are quite thin. The stamps are heated to a temperature which is dependent on the melting temperature of the material of the fiber bundles, for example to a temperature of 300 ° C, by passing a large electric current there for a short duration, after which the stamps cool again quickly. This technique is described by EP 1,136,017.
    A disadvantage of this technique, however, is that precisely due to the local fusing, molten material can stick to the stamp, and not to the holder as intended, when it is withdrawn after being pressed. This results in a less good attachment of the fiber bundles to the holder. This disadvantage becomes greater as the containers become larger and currently prevents this technique from being used for, for example, household brushes.
    An additional disadvantage is that the stamp will then have to be cleaned regularly, as a result of which time is lost and the production proceeds less quickly. Cleaning of the stamp is often the quickest by briefly heating the stamp to, for example, 600 ° C in order to scorch the adhering material. However, this requires a large electric current with a large energy consumption associated with it. In any case, it is clear that cleaning is time-consuming.
    In addition, this technique is not conducive to the service life of the stamp and must be replaced regularly, which ultimately makes this fixation technique very expensive compared to contactless fixation techniques such as heating with convection air, ultrasonic welding and so on.
    Another disadvantage is that the surface of the fused fibers is not completely flat, so that covering with a cover plate or further after-treatment, for example filling with injection molding material, may be desirable or necessary.
    A further drawback is that microscopically small holes and pores may still be present in the mass of the fused fibers which can cause leakage of injection-molded material when carrying out a further after-treatment.
    The present invention has for its object to remedy one or more of the aforementioned or other disadvantages.
    To this end the invention relates to a stamp for melting and locally pressing fiber bundles, wherein the stamp can be heated, characterized in that the stamp on its contact surface where the stamp presses fiber bundles on a holder, consists at least partially of at least one layer of carbon.
    An advantage of a stamp according to the invention is that the stamp with the aforementioned layer of carbon can press the fiber bundles onto a holder, after which the stamp can be withdrawn without any material from the fiber bundle sticking to the stamp.
    As a result, the stamp allows brushes to be manufactured in a more efficient and cheaper manner, whereby less energy is used and the stamps last longer.
    The layer of carbon with which the stamp is equipped is generally known as a layer of graphite.
    Graphite is, as is known, a form of the element carbon and one of the softest materials. The crystal structure is hexagonal. From an atomic perspective, it consists of layers that can easily slide apart. That is why it is also used as a dry lubricant.
    Until now, graphite has not been considered a valid material in the industry to serve as a suitable material for a press-on stamp because it was generally thought that graphite is far too brittle and brittle.
    With the insight to better demonstrate the features of the invention, a few preferred embodiments are described below as examples without any limiting character, with reference to the accompanying drawings, in which: figures 1 to 3 schematically show the stamp according to the invention and a situation in which it is used; Figure 4 shows schematically and cross-section of a brush manufactured according to the invention, wherein the solidly melted fibers are covered by a cover plate; Figures 5-9 schematically show the successive steps of a method in which the stamp according to the invention is used, followed by emphasizing with a second stamp at a lower temperature; Figures 10, 11, 12 show examples of brushes whose manufacture can be done with a stamp according to the invention.
    Figure 1 shows schematically the stamp 1 according to the invention, which in this case consists of solid graphite. In practice, a layer of graphite of a certain thickness will be provided on the contact surface 2 with a stamp 1 that forms part of a mechanical pressing device. Research has shown that instead of pure graphite, graphite containing copper also gives very good results. This composition, which contains, for example, 20% copper, is less brittle than pure graphite.
    The contact surface 2 is provided with a relief pattern in figure 1, but this is not necessary and in most cases a flat contact surface 2 is preferred.
    Figures 1 to 3 show that the stamp 1 is in the vicinity of a holder 3 in which a quantity of fiber bundles 4 is arranged through the holder 3 and wherein the ends 5 of the fiber bundles 4 protrude on the side of the stamp 1. The fiber bundles 4 are hereby held in place by a positioning device 6 and a device with pins 7.
    The operation of a stamp 1 according to the invention is simple and as follows.
    Figure 1 shows that the punch 1 is brought in a direction A towards the holder 3 to press the fiber bundles 4 onto the holder 3 with its contact surface 2 as shown in Figure 2.
    The stamp 3 is preferably heated so that local compression of the ends of the fiber bundles occurs at the pressing. A better pressing of the fiber bundles 4 to the holder 3 is hereby obtained.
    The heating of the stamp 3 can be effected, for example, by electric heating elements which are not shown in the figures and which are arranged in or under the stamp.
    In a concrete example, the fiber bundles 4 consist of, for example, polyethylene terephthalate, polyvinyl chloride, polypropylene or nylon and the fiber bundles are fused locally or otherwise when at least their respective melting temperatures are reached.
    When the fiber bundles 4 have been pressed in long enough, as shown in Fig. 2, the punch 1 is withdrawn in a direction B and removed from the holder 3.
    Figure 3 also shows that due to the embossed pattern on the contact surface 2, a cleaner pressure can be achieved because the local fusion of the fiber bundles 4 takes place in the cavities of the embossed pattern.
    Hereby the ends 5 of the fibers of individual fiber bundles 4 are fused. It is also clear that the relief pattern can take various forms depending on the desired pattern for the pressed material.
    Also, there cannot be a relief pattern 2 so that the ends 5 of the fiber bundles 4 can fuse together to create a film layer over the holder 3 when the ends 5 are sufficiently long. This can be advantageous for certain applications in which, for example, a second component of plastic is injected over the fused ends 5 of the fiber bundles 4 in a subsequent step of the manufacturing process, as this results in less resistance to injection than in the case that the fused ends are not pressed flat.
    Figure 4 shows that the holder 3 with pressed fiber bundles 4 can then be covered by a cover plate 8, wherein the holder 3 can form part of a brush body or can be the brush body itself.
    The cover plate 8 can in this case be a separately manufactured component which is connected to the holder 3 by means of mounting, welding, sticking or other techniques, as described for instance in EP 0.972.464.
    In an alternative embodiment, the cover plate 8 is sprayed directly against the holder 3 by means of injection molding, as described in EP 0,972,465.
    Figures 5 to 9 schematically show the successive steps of a method in which the stamp according to the invention is used, and which is followed by emphasizing with a second stamp at a lower temperature.
    Figure 5 shows that the punch 1 is brought in a direction A towards the holder 3 in order to press the fiber bundles 4 onto the holder 3 with its contact surface 2 as shown in figure 6.
    The stamp 1 is preferably heated, so that local compression of the ends 5 of the fiber bundles occurs at the pressing. A better pressing of the fiber bundles 4 to the holder 3 is hereby obtained.
    When the fiber bundles 4 are pressed in long enough, as shown in Figure 6, as shown in Figure 7, the stamp 1 is withdrawn in a direction B and removed from the holder 3.
    Subsequently, a colder stamp 16 is used for printing as shown in Figures 7 to 9.
    The method according to this alternative embodiment is as follows.
    After fusing by means of the heated stamp 1, a cold stamp 16 is used for further pressing. This means that the heated stamp 1 is withdrawn from the still wholly or partly plastic hot fiber mass in the direction B, as described above, but that instead of allowing this fiber mass to cure afterwards in air, it is immediately afterwards brought into contact with a cold stamp, for example made of a metal such as steel or copper, whether or not externally cooled and against which the fiber mass subsequently cools.
    An extremely smooth surface is hereby obtained at the level of the molten and / or fused and solidified fiber ends, as shown in Figure 9.
    This provides various benefits.
    In the first place, by pressing with the cold stamp, to which nothing sticks, the previously plasticized fiber mass is better connected to the holder 3. This also happens when it consists of a material other than the fibers, which normally only occurs when fibers and containers are made of the same or similar abrasive material that is compatible. It is assumed that the reason for this is that due to the pressure of the cold stamp 16 on the fiber mass and the underlying container, this fiber mass partially penetrates into the bundle openings of the container, or that these openings and / or the container itself can be deformed, which results in a mechanical anchoring between the fiber melt 5 and the holder 3.
    A further advantage is that by pressing with the stamp 16 a flatter and smoother surface is created of the solidified melt than if this were not done.
    As a result, in the event that a plastic is injected over the molten and solidified fibers, less high injection pressures can be used to complete the brush body. This means that there is less leakage of the injection molding material.
    i
    Yet another advantage is that by pressing with the stamp 16 the fiber melt is compressed and made more compact during solidification. As a result, microscopically small holes and pores that would still be in the melt are pressed shut. This in turn results in a more homogeneous fiber layer, which will cause fewer problems of leakage during spraying.
    Figures 10 to 11 give a somewhat more concrete example.
    Figure 5 shows a top view of pressed material on a holder 3 and Figure 6 also shows a perspective view of the fiber bundles 4. Hereby a specific pattern is used whereby the fiber bundles 4 are concentrated on the outer sides of the holder 3.
    Figure 12 shows that the holder 3 of Figure 11 is covered with a cover plate 8 which contains a connection opening 9 for a brush handle.
    The present invention is by no means limited to the embodiments described by way of example and shown in the figures, but a stamp according to the invention can be made in a variety of ways without departing from the scope of the invention.
    权利要求:
    Claims (16)
    [1]
    Stamp for melting and locally pressing fiber bundles, wherein the stamp can be heated, characterized in that the stamp (1) on its contact surface (2) where the stamp presses fiber bundles (4) on a holder (3), at least partially consists of carbon.
    [2]
    Stamp according to claim 1, characterized in that said stamp (1) consists at least partially of carbon in the form of graphite.
    [3]
    Stamp according to claim 1 or 2, characterized in that said stamp (1) is composed at least partly of copper and graphite.
    [4]
    Stamp according to one of claims 1 to 3, characterized in that the contact surface (2) is provided with a relief pattern.
    [5]
    Stamp according to claim 1 or 2, characterized in that said stamp (1) is flat on the contact surface (2).
    [6]
    Stamp according to one of the preceding claims, characterized in that the stamp (1) is heated to a temperature that is at least the melting temperature of the material from which the fiber bundles (4) are made.
    [7]
    Stamp according to one of the preceding claims, characterized in that the stamp (1) is heated by one or more electric heating elements.
    [8]
    Stamp according to one of the preceding claims, characterized in that the stamp (1) is designed as a solid block of carbon.
    [9]
    Stamp according to one of the preceding claims, characterized in that the carbon is applied as a coating on said contact surface (2) of the stamp (1).
    [10]
    Stamp according to claim 8, characterized in that said coating is applied by a spray technique.
    [11]
    Device for manufacturing brushes consisting of a positioning device (6) on which a holder (3) is placed, wherein a quantity of fiber bundles (4) are loosely arranged in the holder (3), characterized in that it provides a stamp (1) according to one of the preceding claims with which the ends (5) of the fiber bundles can be pressed.
    [12]
    Device for manufacturing brushes according to claim 11, characterized in that it provides a second stamp (16) which is suitable for post-printing and the temperature of which is lower than that of the first stamp (1).
    [13]
    Method for producing brushes according to claim 12, characterized in that the second stamp (16) is cooled.
    [14]
    Method for manufacturing brushes according to claim one of claims 12 to 13, characterized in that the contact surface of the second stamp (16) is flat.
    [15]
    Method for manufacturing brushes in which a holder (3) is placed on a positioning device (6), and in which a quantity of fiber bundles (4) are loosely arranged in the holder (3), the fiber bundles (4) having a protruding the end (5) from the holder (3), and wherein the ends (5) of the fiber bundles are pressed with a stamp (1) whose temperature of the contact surface (2) is at least as high as the melting temperature of the material from which the fiber bundles (4) are made, characterized in that, immediately after using the hot stamp (1), a second colder stamp (16) is imitated.
    [16]
    The method for manufacturing brushes according to claim 15, characterized in that the hot stamp (1) is a stamp with the features of one of claims 1-10, more particularly a stamp whose contact surface (2) is at least partially consists of carbon.
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    同族专利:
    公开号 | 公开日
    ES2341599T3|2010-06-22|
    BE1017930A6|2009-11-03|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2012-09-30| RE| Patent lapsed|Effective date: 20120331 |
    优先权:
    申请号 | 申请日 | 专利标题
    BE200800020A|BE1017930A6|2008-01-10|2008-01-10|Stamp for fusing and locally pressing on bundles of fibers used in manufacturing brushes, is at least partially made of carbon on contact surface where stamp presses fiber bundles on holder|
    BE200800020|2008-01-10|DE200960000006| DE602009000006D1|2008-01-10|2009-01-05|Stamp for pressing fiber bundles|
    ES09075002T| ES2341599T3|2008-01-10|2009-01-05|PRESSES TO PRESS MAKES OF FIBERS.|
    EP20090075002| EP2078472B1|2008-01-10|2009-01-05|Stamps for pressing bundles of fibres|
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