FI102507B - Method and apparatus for the manufacture of brush disc - Google Patents

Description

102507

Method and apparatus for making a brush disc

The invention relates to a method for manufacturing a brush disc, which brush disc is in particular intended for use as a brush rotating about a longitudinal axis in a brush assembly together with several corresponding brush discs. The bristle disc preferably consists of a bristle part made of plastic-based material and a circumferential base connecting the radial bristles forming the bristle part indefinitely, provided with at least retaining means for preventing the brush disc from rotating in parallel with the other brush discs in the longitudinal direction. The brush disc is made from a substantially elongate brush blank in which the bristles are joined together by melting, whereby a substantially mass of substantially solid state plastic mass retaining members of said plastic mass.

25

Brush discs of the type described above are used to form brushes in a wide variety of sweeping devices and brushing machines. The brush discs used today generally comprise a circumferential, i.e. perpendicular to the bristles, bent in the shape of a circular ring, made of a generally thin sheet, e.g. about 1 mm thick, into which the bristles are attached, e.g. with a suitable solidifying adhesive. 35 Brush discs of this type are usually planar.

Such semi-metallic brush discs tend to decompose especially in the cold, due to the stiffening of 2,102,507 bristles. In this case, they open the heel plate supporting the brush part in the brush disc at some point, whereby the brush pieces can be detached from the brush disc in larger or smaller parts. In addition, metal-based and plastic-bristled brush discs of the type 5 mentioned above have the problem that their reuse is practically impossible, since it is practically not economically justified to detach the sheet metal base from the bristles. Thus, the 10 types of brush discs presented are disposed of virtually in their entirety in landfills, which is naturally a significant waste problem. In addition, when using brush discs of the type described above, quite supportive support structures, such as metal spacers, retaining rings, etc., have to be used in the actual brushing device, which makes the brush assembled with this type of brush discs disproportionately expensive.

20 On the other hand, Finnish patent No 87977 discloses a previously known brush element made entirely of plastic-based material. Utilizing the method of that patent, a substantially mass of substantially solid state plastic mass is passed over a melt at the top of a substantially vertical brush blank to shape the brush disc into its final shape by a compression mold arrangement by forming a base and preferably retaining members from said plastic. The arrangements disclosed in that patent, in particular for feeding the plastic mass onto the melting edge of the brush blank, are deficient in practical implementation, as a result of which the plastic mass easily settles on the brush blank 35. As a result, the end result of pressing the brush blank into the final brush disc is not sufficiently uniform. In practice, this easily causes significant disadvantages in a brushing device using a brush 3 102507 disc, whereby e.g. the imbalance causes vibration and further wear and tear on the training device. The bristle elements produced by the method described in the above-mentioned patent 5 are planar, therefore the brushing of the bristle disc bristles becomes discontinuous in the longitudinal direction of the brush, especially at the junction of the brush discs. align through the brush without touching the bristles, in which case the brush must be disassembled and its brush discs replaced.

The object of the method according to the present invention for the manufacture of a brush disc is to provide a decisive improvement, in particular to eliminate the above-mentioned problems and thus to substantially increase the state of the art in the art. To achieve this purpose, the method according to the invention is mainly characterized in that the plastic mass is guided on the brush blank pre-bent, such as in a U-shaped extrusion groove or the like, preferably on the melting edge of the preheated brush blank.

The most important advantages of the method according to the invention are its simplicity and reliability. The invention makes it possible, firstly, to produce brush discs which are significantly cheaper and more uniform in terms of both technical and manufacturing costs, in particular because the preformed plastic mass significantly improves the homogeneity of the brush discs, since the plastic mass forming the base cannot be applied eccentrically. Thanks to the invention, the brush discs produced by this method are both very user-friendly and long-lasting, in particular due to their uniformity. In addition, the method according to the invention advantageously ensures, when utilizing the preheating of the brush blank, that the contact between the solid melt and the brush blank 5, which binds them together, is reliably achieved already when the plastic mass is extruded onto the brush blank. The above-mentioned preheating also causes, for example, that the irregularities in the melting edge of the brush blank are equalized by the effect of the heating, which further promotes the most uniform contact between it and the plastic mass.

Preferred embodiments of the method according to the invention are set out in the dependent claims of the method.

The invention also relates to an apparatus operating according to the principle of the method, which is defined in more detail in the preamble of the independent claim. The main characteristic features of the apparatus are set out in the characterizing part of the corresponding claim.

The main advantages of the apparatus according to the invention are the simplicity and reliability of its construction and use, whereby with quite simple arrangements, e.g. by preheating the brush blank, preferably by preheating, it is possible to provide uniform and continuous contact with the melting edge of the brush blank and the material to be extruded. between. The brush discs produced by the apparatus are particularly homogeneous, because the extrusion groove corresponding to the shape of the brush-35 blank in the extruder belonging to the apparatus places the plastic mass preformed on the brush blank, so that it cannot be applied e.g. eccentrically. In addition, the brush discs 5 102507 produced by the apparatus according to the invention remain particularly well sized due to the fact that the contact between the base mass forming the base part and the brush blank forming the brush part is sufficiently tight from extrusion due to preheating, which means that the brush discs produced by the apparatus are also of uniform quality thanks to. The apparatus according to the invention is advantageously utilized in particular in connection with a bristle disc, the location of the radial-10 outer circumferential contact of the bristle portion being arranged to vary substantially across the width of the bristle disc. The brushing result of this type of brush disc remains optimal for the brushing effect, despite the wear of the bristles, for considerably longer than with the current planar brushes, i.e. in principle until the end of the bristles.

Preferred embodiments of the apparatus according to the invention are set out in the dependent claims for the apparatus.

25

In the following description, the invention will be described in more detail with reference to the accompanying drawings, in which Figures 1a and Ib 30 show a sectional side view of a brush made of conventional brush discs: somewhat used a and highly used b, 35 Figure 2 shows a preferred brush disc in perspective view, 6 102507 Figure 3 shows the longitudinal view of the manufacture of the brush disc according to Fig. 2, and Figs. 4a and 4b 5 show a front view and a side view of the extrusion body of the apparatus applying the method according to the invention.

The invention relates to a method for manufacturing a brush disc, which brush disc is intended in particular for use with a plurality of corresponding brush discs in a brush machine as a brush w rotating about a longitudinal axis s. The brush disc preferably consists of a bristle part 15 made of plastic-based material and a radial r bristle 1a forming an endlessly connecting circumferential base 2 forming the bristle part 1, at least The brush disc is made of a substantially elongate brush blank 1 ', in which the bristles 1a are connected to each other by melting 1', whereby a substantially solid mass of plastic mass 2 'is preferably applied to the melt ls at the top of the brush blank 1' running in a substantially vertical direction. to shape the disc into its final shape by means of a compression mold arrangement X, the base part 2 and 30 preferably also forming retaining members 3 of said plastic mass 2 '. The plastic mass 2 'is applied to the brush blank 1': pre-bent into a shape, such as from a U-shaped extrusion groove U or the like, as a further preferred application on the melting edge 1 'of the preheated brush blank 1' in the same connection.

7 102507

A particularly preferred embodiment comprises an extrusion device 4 feeding solid plastic mass 2 ', such as an extruder or the like, through a heated and substantially elongate extrusion groove 4a, inside which, through the passage 4a' therein, the brush blank 1 'is guided in particular to preheat its melting edge 1'. before extruding the plastic mass 2 'onto it.

The principle described above is apparent in particular from Figures 4a and 4b, which show a preferred extrusion body of an extrusion device operating by the method according to the invention in a front view and a side view. Furthermore, the preferred brush discs 15 shown in Figures 2 and 3 utilize the principles of the applicant's previous patent application FI 963433, "Brush disc", wherein the base of the brush disc 2, which is arranged in a substantially constant cross section and to which the brush part 1 is attached centrally, is arranged at at least two points. x from its basic plane o to the lateral direction, preferably as a constant continuous waveform. As a further preferred embodiment with reference to Fig. 2, the base part 2 is arranged on one side of its basic plane o extending laterally in the direction Is 25. using a three-dimensional compression mold arrangement X. In this case, the two compression molds X1 of the compression mold arrangement X are arranged on their surfaces against the base part 2 and the brush part 1 preferably extending laterally from the base plane o in the lateral direction s130 at four points x.

Comparing the brush consisting of the above-described brush discs and its operation, in particular with the conventional brush 35 shown in Figs. 1a and Ib, it can be seen that a brush disc of the above type can be used as long as its bristles still have a sufficient brushing effect. The assembly of conventional brush discs in principle always requires the use of spacers between successive brush discs as shown in Figures 1a and Ib, which further emphasizes the defective operation of conventional planar brush discs 5 in that the contact surface provided by the outer surface of the brush . For example, a brush as shown in Figure Ib would no longer be useful in the most common applications, and a brush as shown in Figure 1a would already be satisfactorily used in certain demanding applications at frontiers.

A further preferred embodiment of the method, the brush 15 as a whole, i.e. the bristles 1a forming its brush part 1 and the plastic mass 2 'forming the base part 2, are made of recyclable and preferably substantially the same material, such as polypropylene or the like.

20

In a further preferred embodiment, the extrusion shape of the plastic mass 2 'is adjusted to correspond to the width of the brush blank 1' of the brush disc to be manufactured in each case by using e.g. extrusion bodies 4a removably attached to the extrusion device 4.

The apparatus according to the invention for producing brush discs of the type 30 described above thus comprises at least an extrusion body 4a for guiding the plastic mass 2 '; sex on the brush blank 1 'pre-bent, such as from a U-shaped extrusion groove U, preferably on the melting edge 1's of the preheated brush blank 1' 35, after which the brush disc can be shaped to its final shape between the base part 2 and preferably also 9 102507 to form retaining members 3 from said plastic mass 2 '.

As a preferred embodiment, an extrusion device 4 for feeding solid plastic mass 2 '5, such as an extruder or the like, comprises a heated and especially with reference to Fig. 4b a substantially elongate extrusion body 4a for guiding the brush blank 1' inside it, through the passage 4a 'therein. to preheat before extruding the plastic mass 2 'onto it. As a preferred embodiment, the extrusion body 4 comprises an extrusion groove U and / or a passage groove 4a 'removably arranged to be attached to the extrusion body 4a, e.g. to adjust the extrusion shape or the passage groove 15 to the width of the brush blank 1' of the brush disc to be manufactured. With particular reference to Fig. 4a, the extrusion body 4a comprises, in cross-section, a passage 4a 'at its bottom, substantially corresponding to the width of the brush blank 1'. With further reference to Fig. 4b, an extrusion groove U is arranged around the passage groove 4a 'of the extrusion head 4a of the extrusion frame 4a.

It is clear that the invention is not limited to the above-described or described applications, but can be varied considerably within the basic idea of the invention. In this case, it is firstly possible to form brush discs of the type described above from a wider base than described above, to which is attached, for example, one uniform helical or two- or more-headed thread: brushing. On the other hand, it is possible to utilize the principles presented above by using solutions of the type shown in the drawings, in which the base part comprises, as a standard, a structure with a knee length, in contrast to a continuous cross-section. It is also possible to provide the brush discs according to the invention with, for example, additional retaining arrangements on the axial side surfaces of their bases, e.g. operating on the male-female principle, in which case, of course, there is a need for their own corresponding additional abutment surface arrangements. Naturally, in this connection it is possible to utilize a wide variety of materials, in which case polypropylene has been presented as a material for making brush discs only by way of example as one, albeit very well-suited, alternative in practice.

Claims (8)

A method of manufacturing a brush disc, which brush disc is intended to be used separately as a brush which rotates (w) about its longitudinal axis (s) with one or more corresponding brush discs in a brush machine and which brush disc preferably consists of made of brush-based material of uniformly formed brush part (1) and a stem part (2) which connects the brush part (1) forming and radially positioned the brush (1a) and tili which have provided at least pouring means (3) to prevent the brush plate to twist when placed in its place in the brush body of the brush machine, wherein the brush plate is made of a substantially elongated brush body (1 '), wherein the brush (1a) contained therein are interconnected to each other with melting (1's), whereby on the melt (1's), which is in the upper edge of the brush body (11), which moves substantially in a vertical position, the plastic pulp (2 ') is preferably passed in a substantially rigid until lit, in order to process the brush plate to its final shape by means of a molding device by forming the stem part (2) and preferably also the pouring means (3) of said plastic mass (2 '), characterized in that the plastic mass (2') is guided • the melting edge (1's) of the brush body (11), which is preferably preheated in this connection, by means of a spreader device (4), such as an extruder or equivalent, which feeds the rigid plastic mass (21) in a fully bent form, such as from a U-shaped spacer (U) or in a similar way. « 2. A method according to claim 1, characterized in that the spreader device (4) comprises a 3. preheated and substantially longitudinal spigot body (4a), the brush body (1) being guided internally thereto by a passage barrier (4a1) or correspondingly specially arranged therein. preheating its melting edge (1's) before the plastic mass (21) should be sprayed on the same. Method according to Claim 1 or 2, 5, characterized in that the molding shape and / or the passageway is adjusted to correspond to the width of the brush body (I1) to the brush plate to be manufactured in each case, by using molding bodies (4a), to be attached to the splicing device (4) in a detachable manner and having a mutually deviating shape including splicing bar (U) and / or passage bar (4a ·) or by a corresponding arrangement. Apparatus for manufacturing a brush disc, which brush disc is intended to be used particularly as a brush, which rotates (w) about its longitudinal axis (s) with one or more corresponding brush discs in a brush machine and which brush disc preferably consists of of plastic-based material, uniformly made brush part (1) and a stem part (2) which connect the brush part (1) forming and radially positioned the brush (1) and tile which have at least inclined means (3) arranged to prevent the brush plate to twist when placed in its place in the brush body of the brush, the brush plate being made with the arrangement of a substantially elongated brush blank (1), wherein the brush (1a) present therein is interconnected with melting (1's). ), Wherein on the melt (1's), which is at the upper edge of the brush body (1 '), which moves substantially in. vertical position, has led plastic pulp (21) preferably in a substantially rigid state, to process the brush plate to its final shape between a press molding device by forming the stem portion (2) and preferably also the pouring means (3) of said plastic pulp (2). characterized in that the device belongs to a spreader device (4), such as an extruder or equivalent, which feeds the rigid plastic mass (2 '), wherein the plastic mass (2') is arranged to be guided on the melting edge (11 seconds). ) of the brush body (1 ') / which is preferably preheated in this context, by means of a molding body (4a) associated therewith in a fully curved shape, such as from a U-shaped molding latch (U) or a corresponding way. 5. Apparatus as claimed in claim 4, characterized in that the spreader device (4) comprises a preheated and substantially longitudinal spigot body (4a) for guiding the brush body (111) internally therein through a passage barrier (4a ') present therein or on a correspondingly in particular to preheat its melting edge (1's) before the plastic pulp (2 ') should be sprayed thereon. Apparatus according to Claim 4 or 5, characterized in that the device belongs to spreader bodies (4a) which are to be attached to the spreader device (4) in a removable manner and which have a mutually deviating shape comprising splicing grooves (U). ) and / or passage barrier (4a1) or by a corresponding arrangement for regulating the molding shape and / or passage barrier to correspond to the width of the brush body (1 ') to the brush plate to be manufactured in each case. Device according to any of the above claims 4-6, characterized in that the spreader body (4a) comprises a passage lock (4a '), the width of which corresponds essentially to the width of the brush body (1') and which is when viewed in a cross section in the bottom of the molding body (4a). 35 Apparatus according to any one of the preceding claims 4-7, characterized in that a splicing bar (U) is arranged at the splicing end (I) of the spacer body (4a), preferably around the passage spacer (4a '). ).