Source: http://www.google.com/patents/US20030163884?ie=ISO-8859-1&dq=5,890,152
Timestamp: 2016-05-25 15:01:41
Document Index: 229703141

Matched Legal Cases: ['art 35', 'art 36', 'art 36', 'arts 35', 'art 36', 'art 35', 'arts 35', 'art 36', 'art 70', 'art 78', 'art 81', 'art 82', 'arts 78', 'art 82']

Patent US20030163884 - Method and device for producing bristle products and bristle products - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsBrush ware comprising at least one carrier and bristles made from a moldable plastic material disposed thereon, is produced by providing the carrier with through holes acting like spinning nozzles, to which bristle-shaped molding channels join and a plastic melt for the bristles is injected from at least...http://www.google.com/patents/US20030163884?utm_source=gb-gplus-sharePatent US20030163884 - Method and device for producing bristle products and bristle productsAdvanced Patent SearchPublication numberUS20030163884 A1Publication typeApplicationApplication numberUS 10/311,799PCT numberPCT/EP2001/007439Publication dateSep 4, 2003Filing dateJun 28, 2001Priority dateJul 10, 2000Also published asCA2415140A1, CN1187007C, CN1441644A, DE10033256A1, DE50115197D1, EP1299017A1, EP1299017B1, US7503093, WO2002003831A1Publication number10311799, 311799, PCT/2001/7439, PCT/EP/1/007439, PCT/EP/1/07439, PCT/EP/2001/007439, PCT/EP/2001/07439, PCT/EP1/007439, PCT/EP1/07439, PCT/EP1007439, PCT/EP107439, PCT/EP2001/007439, PCT/EP2001/07439, PCT/EP2001007439, PCT/EP200107439, US 2003/0163884 A1, US 2003/163884 A1, US 20030163884 A1, US 20030163884A1, US 2003163884 A1, US 2003163884A1, US-A1-20030163884, US-A1-2003163884, US2003/0163884A1, US2003/163884A1, US20030163884 A1, US20030163884A1, US2003163884 A1, US2003163884A1InventorsGeorg WeihrauchOriginal AssigneeGeorg WeihrauchExport CitationBiBTeX, EndNote, RefManPatent Citations (18), Referenced by (82), Classifications (36), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetMethod and device for producing bristle products and bristle products
[0099] The invention is described below with respect to some embodiments shown in the drawing, wherein FIGS. 1 through 4 show prior art. [0100] [0100]FIG. 1 shows a partial cross-section of a carrier and bristles unit, injected in a conventional manner as one piece; [0101] [0101]FIG. 2 shows an enlarged view of the detail II of FIG. 1; [0102] [0102]FIG. 3 shows a partial cross-section corresponding to that of FIG. 1 of a first embodiment of brush ware produced in accordance with the invention; [0103] [0103]FIG. 4 shows an enlarged view of the detail IV of FIG. 3; [0104] [0104]FIG. 5 shows a longitudinal section of a bristle carrier before mounting of the bristles; [0105] [0105]FIG. 6 shows an enlarged view of the detail VI of FIG. 5 after injection of the bristles; [0106] [0106]FIG. 7 shows a longitudinal section of an embodiment in the form of a broom; [0107] [0107]FIG. 8 shows a longitudinal section of another embodiment corresponding to FIG. 7; [0108] [0108]FIG. 9 shows a partial cross-section of a cylindrical brush; [0109] [0109]FIG. 10 shows an enlarged view of the detail X of FIG. 9; [0110] [0110]FIG. 11 shows a partial section of a brush head; [0111] [0111]FIG. 12 shows a partially cut view of a flat brush; [0112] [0112]FIG. 13 shows a schematic top view onto a bristle stock of a square brush; [0113] [0113]FIG. 14 shows a section XIV-XIV in accordance with FIG. 13; [0114] [0114]FIG. 15 shows an enlarged view of the detail XV of FIG. 14; [0115] [0115]FIGS. 16 through 19 each show a partial section of a carrier with differing geometrical shapes of the holes; [0116] [0116]FIG. 20 shows a top view onto a bristle stock of a toothbrush head; [0117] [0117]FIG. 21 shows a longitudinal section XXI-XXI of the toothbrush head in accordance with FIG. 20; [0118] [0118]FIG. 22 shows a top view onto another embodiment of the bristle support of a toothbrush head; [0119] [0119]FIG. 23 shows a longitudinal section of the toothbrush head in accordance with FIG. 22; [0120] [0120]FIG. 24 shows an enlarged view of the detail XXIV of FIG. 23 before injecting the bristles; [0121] [0121]FIGS. 25 through 29 each show one partial cross-section of a carrier with injected bristles with differing embodiments of the holes; [0122] [0122]FIG. 30 shows a partial cross-section of a carrier with bristles of different designs; [0123] [0123]FIG. 31 shows a partial cross-section of a carrier with injected-through hollow bristle; [0124] [0124]FIG. 32 shows a partial cross-section in accordance with FIG. 31 with a bristle of another embodiment; [0125] [0125]FIG. 33 shows a schematic view of the injection side of an injection mold with molding channels of different embodiments; [0126] [0126]FIG. 34 shows a partial cross-section XXXIV-XXXIV in accordance with [0127] [0127]FIG. 33; [0128] [0128]FIG. 35 shows a schematic perspective view of a part of the injection mold in accordance with FIG. 33; [0129] [0129]FIG. 36 shows a section through a multiple-component injection-molding unit in the injecting phase; [0130] [0130]FIG. 37 shows an enlarged view of the detail XXXVII in accordance with [0131] [0131]FIG. 37; [0132] [0132]FIG. 38 shows the injection-molding unit in accordance with FIG. 36 after the injection phase and during stretching of the bristles; [0133] [0133]FIG. 39 shows an enlarged view of the detail XXXIX in accordance with FIG. 38; [0134] [0134]FIG. 40 shows a section through an injection mold with molding channels in each injection phase; [0135] [0135]FIG. 41 shows the injection mold in accordance with FIG. 40 during removal; [0136] [0136]FIG. 42 shows the injection mold in accordance with FIG. 40 during gradual removal; [0137] [0137]FIG. 43 shows another embodiment of the injection mold in accordance with FIG. 40 in the injection phase; [0138] [0138]FIG. 44 shows the injection mold in accordance with FIG. 43 in a first removal phase; [0139] [0139]FIG. 45 shows the injection mold in accordance with FIG. 43 in a further removal phase; [0140] [0140]FIG. 46 shows a further embodiment of an injection mold in the injection phase; [0141] [0141]FIG. 47 shows the injection mold in accordance with FIG. 46 during stretching of the bristles; [0142] [0142]FIG. 48 shows a further embodiment of an injection mold with molding channels in the injection phase; [0143] [0143]FIG. 49 shows the injection mold in accordance with FIG. 48 during stretching of the bristles; [0144] [0144]FIG. 50 shows a partial section through a carrier with injected-through bristles; [0145] [0145]FIG. 51 shows a partial cross-section of a carrier with injected-through bristles; [0146] [0146]FIG. 52 shows a longitudinal section of a two-component bristle; [0147] [0147]FIG. 53 shows a longitudinal section in accordance with FIG. 52 of a two-component bristle in another embodiment; [0148] [0148]FIG. 54 shows a third embodiment of a two-component bristle; [0149] [0149]FIGS. 55 through 58 show different embodiments of shaping elements of an injection mold in cross-section; [0150] [0150]FIGS. 59 through 62 show one partial longitudinal section of the mold elements in accordance with FIGS. 55 through 58; [0151] [0151]FIGS. 63 through 68 show different cross-sections of other embodiments of the multiple-component bristle; and [0152] [0152]FIG. 69 shows a cross-section of a cleavable bristle. [0153] [0153]FIGS. 1 and 2 are partial cross-sections through brush ware, e.g. a section in the region of the head of a tooth brush, which has been conventionally produced as a single piece through injection molding (e.g. U.S. Pat. No. 5,926,900). It comprises a carrier 1 and parallel bristle-like working elements in the form of “bolts” or “pins” which extend conically from the carrier towards their free end. The support and working elements are produced in an injection mold having a cavity corresponding to the finished brush ware. During feeding of the plastic melt in accordance with the arrow 3, that part of the cavity which forms the support is initially filled, and the molding channels for the working elements 2 are subsequently filled, thereby producing working elements having a large diameter and a relatively large diameter to length ratio. The polymer molecules in the melt have an irregular and knotted structure, which substantially remains, in the region of the carrier 4. As indicated in the transition region 5, the molecular chains are longitudinally oriented to a certain extent when they enter the molding channels for the working elements 2 due to the reduction in the cross-section. The wall friction produces a shear flow along the further melt path, which also produces a certain degree of molecular orientation, at least in the outer region near the surface of the bolt-like working element. The extent of the longitudinal orientation is decisive for the bending elasticity, bending fatigue strength, and bend recovery the cleaning element. As shown in FIG. 2, the weakest point of the working element 2 is the transition region 5 to the carrier 4 since the molecular orientation is completely insufficient and, moreover, is produced substantially only close to the surface along the further length. [0154] In accordance with the inventive method of FIGS. 3 and 4, a carrier 6 is initially shaped, thereby forming through holes 7 in the manner of spinning nozzles. Ideally, these through holes have a nozzle shape used in spinning technology. However, they may also have a simpler geometry to achieve, as do spinning processes, the primary goal of self-reinforcement through a longitudinal molecular orientation, which begins within the holes. [0155] The carrier 6 of the embodiment shown comprises a depression 8 on its rear side from which the through holes 7 extend. The plastic melt for the bristles 9 is injected into the depression 8 from the injection side indicated with the directional arrow 3 and simultaneously injected through the through holes 7 into the molding channels (not shown) of an injection mold which will be described below. The bristles 9 are uniformly bonded with the plastic material 10 filling the depression 8 as shown in particular in FIG. 4. Since the through holes are shaped similar to spinning nozzles, the unoriented molecules 11 are initially pre-oriented when they enter the hole 7 and nearly completely extended in the longitudinal direction of the bristle 9 throughout the further path of the melt until they exit the carrier 6. The associated self-reinforcement (through molecular orientation) gives the bristle 9 properties similar to those exhibited by only extruded or spun monofilaments. [0156] [0156]FIG. 5 shows the complete carrier 6. It can form the body of a brush or at least part thereof and therefore have a corresponding contour. It is provided with a number of through holes 7 corresponding to the finished bristle stock of the brush, which are designed to form one, bristle each. [0157] The through holes are formed like spinning nozzles (FIG. 6 shows the ideal case). Using spinning technology terminology, the plastic melt produces the so-called melting cushion 12 in the depression 8, which passes into the insertion funnel in the form of a conically changing section 13. This insertion funnel maps into the guiding path 14 (also called shearing zone) of cylindrical cross-section, which passes, via a conical transition zone 15, into the so-called smoothing path 16 with reduced cross-section. The diameter to length ratio of the smoothing path is between 1:1 and 1:6. A hole 7 of this shape produces optimum stretching and longitudinal orientation of the molecules in the bristle 9. [0158] To obtain a bristle-like structure, the smallest width of the through holes 7, e.g. along the smoothing path 16, should be ≦3 mm. The ratio between bristle length and the smallest cross-section of the hole 7 should be ≦1:5, preferably ≦1:10, wherein this ratio can be up to 1:250. [0159] Experiments have shown that a hole having substantially only the smooth path 16 with an entrance region tapering down to the diameter thereof and with a diameter to length ratio of 1:4 leads to an increase in injection velocity and wall friction of the melt flow to result in excellent self-reinforcement of the bristle. A larger diameter to length ratio e.g. 1:1 facilitates use of a thinner, in particular, more flexible carrier. [0160] In a configuration of the hole 7 in accordance with FIG. 6, an entrance diameter of the entrance funnel of 8.5 mm and a smoothing path diameter of 0.5 mm increase the flow velocity of the melt by a factor of 28.5. The higher the velocity, the steeper the velocity distribution and the more prominent the shear forces, which are amplified to a further extent by the conical transitions. [0161] The melt cushion 12 in accordance with FIG. 6 serves as a melt supply in conventional fiber spinning. In connection with the invention, it is also a melt reserve during injection of the bristles 9 and serves an additional distribution function. Moreover, additional melt is supplied into the through holes 7 and downstream molding channels as needed and in response to the conventional injection pressure, to obtain perfect shape filling. This melt cushion also forms a constructive part of the finished brush ware after injection in which the bristles 9 are integrated and which, together with the carrier, forms the layered structure shown in FIG. 3. Alternatively, the depression 8 can be subdivided along the carrier 6 for forming parallel bridges or gratings to which the bristles 9 are connected. In the case of a grating, this would be at the crossing points. [0162] [0162]FIG. 7 shows a schematic representation of an embodiment of a brush wherein the carrier 6 is, similar to FIGS. 3 and 5, substantially plate-shaped and provided with the through holes 7 through which the bristles 9 are injected. The rear side of the carrier 6 is filled with the plastic material of the bristles 9 and connected to a broom body 17 either mechanically or through injection molding. The broom body 17 surrounds the edges of the carrier 6 and has a central handle casing 18 for a broom handle. The embodiment in accordance with FIG. 8 corresponds substantially to the one of FIG. 7, however, the handle casing 19 consists of the same plastic material as the bristles 9 and is injected in one piece therewith. [0163] [0163]FIG. 9 shows part of an eyelash brush (mascara brush) wherein the carrier 20 has substantially the shape of a tube and is closed at a rounded end. The tube-shaped carrier 20 comprises narrow through holes 21 shaped as spinning nozzles (FIG. 10). The melt for the bristles is injected into the tube-shaped carrier 20 and penetrates through the through holes 21 into molding channels (not shown) of an injection mold thereby forming closely spaced thin bristles 9. The tube-shaped carrier is thereby completely filled with the plastic melt to produce a cylindrical core 21 for reinforcing the tube-shaped carrier 20. The carrier 20 and/or the core 21 can simultaneously form a handle at the right-hand side of FIG. 9. [0164] The carrier 22 of the embodiment of FIG. 11 is a short cylinder with a rounded end having the substantially radially extending through holes 7. The through holes have a diameter/length ratio on the order of 1:1. In this case as well, the plastic melt for the bristles 9 is supplied from the inside and penetrates through the through holes 7 towards the outside thereby forming the bristles 9. Individual bristles 23 can also be hollow for guiding e.g. a liquid medium. In this case, the injection mold (not shown) is provided with displaceable pins between the molding channels for the bristles 9, which form the hollow space of the bristles, 23 and which are removed after injection of the bristles 9. Additional pins can be used to provide through holes between the bristles for dispensing a medium among the bristles. The inner coating 24 formed by the plastic melt on the inside of the carrier 22 reinforces the partially cylindrical carrier 22. Its inner space can be either completely or partially filled with a further plastic material. The plastic melt used therefor can also optionally serve as a filling for the hollow bristles 23 and also optionally be injected there through to exit at the opening of the hollow bristle 23 and form a bristle extension of another material. The embodiment in accordance with FIG. 11 is suitable e.g. for toilet brushes. Spherical brushes with only one injection point on the spherical carrier can also be produced in a similar fashion. [0165] [0165]FIG. 12 schematically shows a flat brush with a brush casing 25 and a handle 26 which are produced in one piece e.g. using injection or blow molding. The end face of the casing 25 has through holes, which extend from a hollow space 27 and are shaped like spinning nozzles. The plastic melt for the brush bristles 9 is injected into the hollow space 27 via one or two injection points. The melt penetrates through the through holes 7 into molding channels (not shown) of an injection mold thereby forming the bristles 9. At the same time, this plastic melt forms a core 28 which fills the hollow space 27, reinforces the casing 25, and forms a handle region. This reinforcement is particularly important for a blown brush body. [0166] [0166]FIG. 13 shows a substantially square hand brush or a support therefor which could also be the head of a paintbrush. The carrier 6 herein is a prefabricated frame, which is open on one side and has through holes 7 on the closed side. The bristle stock consists of an outer bristle field 29 and an inner bristle field 30 which are hatched in FIG. 13 for clarity. In a one or two-step injection mold process, a first plastic melt is injected through the through holes 7 lying within the bristle field 29 and another plastic melt is injected through the through holes 7 lying in the second bristle field 30 to produce bristles 31 or 32 with different mechanical and/or physical properties. The outer bristles 31 can have a larger diameter than the inner bristles 32 (shown on an enlarged scale in FIG. 15). They can also have with different fillers or color. [0167] [0167]FIGS. 16 through 19 show different constructive embodiments of the carrier 6 with through holes 7 wherein the dimensions are given in millimeters. These dimensions generate a particularly prominent spinning nozzle effect, wherein the terminology used in connection with FIG. 6 is characteristic in spinning technology. The insertion funnels and transition zone of all embodiments in accordance with FIGS. 16 through 19 have a conical angle of 60�. The opening diameter of the insertion funnel and the inlet diameter of the transition zone and therefore the diameter of the guiding path, also referred to as shearing zone, is 0.6 mm in each case. The melt cushion has a thickness of 0.5 mm and the diameter of the smoothing path is 0.2 mm in all four cases. The through holes 7 have differing guiding and smoothing path lengths. These are, respectively, 1.8 and 0.88 mm for FIG. 16, 1,6 and 1.0 mm for FIG. 17, 1.4 and 1.2 mm for FIG. 18 and 0.6 and 2.0 mm for FIG. 19. The longitudinal molecular orientation of the melt is effected, in particular, by the guiding and smoothing path lengths where the shear flow is large due to wall friction. [0168] [0168]FIGS. 20 and 21 show a toothbrush head 33, which can be injected in one piece with the toothbrush handle 34 (not shown in detail). The tooth brush head 33 consists of a part 35 close to the handle and a front part 36 separated therefrom which both form the carrier for the bristles, wherein the front part 36 is injected from a softer, e.g. rubber-elastic plastic material. The two parts 35 and 36 have a depression on their rear side into which the plastic melt for the bristles is injected. The front head part 36 of the bristle stock consists of bundles 37 each formed of individual bristles and the part 35 close to the handle consists of closely adjacent individual bristles 38. The parts 35 and 36 of the brush head forming the carrier have through holes 7 for shaping the plastic melt injected on the optionally recessed rear side. The bristles forming the bundles 37 and the closely adjacent bristles 38 can thereby consist of plastic materials having different properties, color, etc. [0169] [0169]FIGS. 22 and 23 show the head of a toothbrush. Only differences in comparison to FIGS. 20 and 21 are described. In this case, the front part 36 also comprises bundles 39, however, the through holes 7 for producing them have a different design. One single hole is used for forming a bundle, as shown in FIG. 23. FIG. 24 shows the cross-section of these through holes in an enlarged scale. They have an insertion funnel 40, a guiding path 41 and a transition zone 42, which maps into several adjacent smoothing paths 43. The number of smoothing paths 43 corresponds to the number of bristles within the bundle 39 (FIGS. 22 and 23). The individual bristles 44 within the bundle 39 can have differing lengths such that the ends lie on a sloped or curved envelope surface (see FIG. 23). The ends are precisely rounded. [0170] In the above-described embodiments, the shape of the through holes 7 is substantially matched to the proportions of a spinning nozzle. The molecular orientation effect can already be achieved with a simpler cross-sectional design for the through holes as shown in FIG. 11, FIGS. 25 through 29 and 31. In accordance with FIG. 25, the carrier 6 has a hole 7 which joins the depression 8 with a conically narrowing section 45 corresponding to the insertion funnel, followed by a substantially cylindrical, optionally slightly conical section 46 which continues into a collar 47 on the carrier thereby producing a longer shearing zone. At the same time, the region 48 of the bristle 9 where the molecular orientation has not yet or only insufficiently taken place, is wrapped within the collar 47 of the carrier 6. The embodiment in accordance with FIG. 26 differs from FIG. 25 in that the carrier has a collar 49 extending into the depression 8 whereas FIG. 27 shows an external and internal collar 47 or 49 and the internal collar 50 of FIG. 28 has an additional insertion funnel 51. Finally, the embodiment of FIG. 29 is modified with respect to FIG. 28 in that the carrier 6 has an external collar 52, which tapers in an inward direction to produce additional confinement of the plastic melt. [0171] [0171]FIG. 30 shows different embodiments of bristles resulting from through holes 7 on the carrier 6 having the same shape, namely a smooth-walled, conically extending bristle 54, a bristle 55 with irregular longitudinal profile, a bristle 56 with uniform longitudinal profile, and a stepped, tapering bristle 57. These can be produced through injection molding with layered plates, as will be described below. [0172] [0172]FIGS. 31 and 32 show a carrier 6 with through holes 7 and depressions 8 as described before, wherein the injected bristles are formed as hollow bristles 58 with closed ends 59 or as hollow bristle 60 with open ends 61. [0173] The hollow space 62 or 63 is obtained by disposing displaceable shaping pins (not shown) at the injection side, which are introduced through the through holes and the molding channels (not shown) prior to extruding the bristles. The plastic melt for the bristles 58 or 60 injected into the depression 8 is annularly injected through the through holes 7 between the molding channel and the inserted pin, wherein a longitudinal orientation on the inner wall of the molding channel and on the wall of the shaping pin is effected due to wall friction and increased melt speed such that self-reinforcement through longitudinal molecular orientation is ensured over the entire cross-section and length of the hollow bristle. [0174] [0174]FIGS. 33 through 35 schematically show part 70 of a multiple-component injection mold, wherein this part comprises the molding channels 71 for the bristles which are each disposed in correspondence with the arrangement of the bristles in the bristle stock of the finished brush ware. The upper part of the representation shows molding channels 72 having a semi-circular cross-section, the central part shows molding channels 73 with square cross-section and the lower part shows molding channels 74 with circular cross-section. The injection mold 70 consists of plates, which are layered parallel to the molding channel of which neighboring plates 75, 76 form part of each molding channel. With smaller cross-sections and larger length of the molding channels 71, which makes removal in the direction of the molding channels difficult, the plates 75,76 can be slightly displaced in the direction of the double arrow. [0175] [0175]FIG. 36 shows an injection mold unit 77 with a multiple-component injection mold whose normally stationary part 78 has a supply channel 79 for the plastic melt of the bristles and a molding space 80 in which the pre-fabricated carrier 6 with through holes is inserted or directly produced through injection. The further displaceable part 81 has the molding channels 71 for forming the bristles. The embodiment shown finally comprises a third part 82 with a cavity 83 into which the melt injected via the feed channel 79 through the through holes (not shown) of the carrier 6 and into the molding channels 71 enters to fill this cavity and form a plate-like abutment 84. FIG. 37 shows details in the region of the mold-separating plane between the parts 78 and 81 of the injection mold unit 77. After injection molding, the part 82 with the plate-shaped abutment 84, which connects the ends of the bristles 9, is first displaced in the direction of the arrows such that the bristles 9 are stretched thereby producing bristles 85 having a further improved longitudinal orientation of the molecular chains. Stretching can be carried out directly after injection molding or after a certain time depending on the plastic material and the geometrical dimensions of the molding channels, i.e. the produced bristle geometry. [0176] [0176]FIGS. 40 through 49 show an injection mold 86 having molding channels 71 which consists of individual plates 87 layered transverse to the axis of the molding channels 71, and an end plate 88 wherein the plates 87 each constitute a longitudinal section of the molding channel 71. The end plate 88 forms the bristle ends. The plastic melt is also injected through the through holes 7 of the carrier 6 into the molding channels 71 until it reaches the end plate 88. Ventilation can occur in the separating plane between the plates 87—as is known from conventional injection molding in the mold separation plane. The plates 87 and 88 can be displaced with respect to the carrier 6 or the stationary part of the injection mold either individually or, as shown in FIGS. 41 and 42, in groups. This can be effected in one step (see FIG. 41). However, the end plate 88 is preferably removed first, optionally together with the directly following plates 87, and the bristles 9 are initially removed in a region of their ends and subsequently along their remaining lengths. [0177] As is indicated with the double arrow in FIG. 41, the plates 87, 88 can also be displaced in an oscillating manner transverse to the molding channels 71 or rotated so that the bristles are subjected to an alternating bending loading relative to the carrier 6 which leads to a self-reinforcement near the surface of the bristle at the bending location to further improve the flexibility and bend recovery of the bristle. [0178] The end plate 88 is preferably exchangeable to form either an abutment for stretching or different contours on the bristles 9. FIG. 43 shows such an end plate 88 having rounded enlargements 89 to form e.g. a round head on the bristles 9. For removing the bristles, this end plate 88 is also segmented parallel to the molding channels as described in connection with FIGS. 33 through 35. If the rounded head 90 is merely an abutment for stretching the bristles 9, which is to be subsequently removed, this can also be effected through transverse displacement of the end plate 8, which then functions as a cutting plate. [0179] [0179]FIG. 44 shows another embodiment of the end plate 88. It also has rounded enlargements 91 which have a longitudinal profile 92 on their injection side. For mold removal, the end plate 88 is first removed and the heads formed in the rounded enlargement 91 are reshaped to be parallel to the bristles while simultaneously being provided with a longitudinal profile 93. Mold removal in the manner described in connection with FIGS. 41 and 42 then follows. [0180] [0180]FIGS. 46 and 47 show still another embodiment of the end plate 88 having a section 94 with increased conical tapering and a subsequent enlargement 95 such that the injected through bristle 9 comprises a firstly narrowed and subsequently thickened end. Through removal of the end plate 88 only the front part of the bristle is stretched as shown in FIG. 47 and its diameter is reduced such that the produced bristle is thinner in the front region 96 than in the other region but has high bending fatigue strength due to the additional stretching. The end plate 88 is also segmented to remove the thickened ends 97 of the bristles. If the thickened ends 97 serve only as abutment for stretching, they are subsequently separated. In this case as well, an oscillating transverse motion of the end plate 88 can introduce an alternating bending loading in the region of reduced bristle cross section in the transition to region 96 to provide a reserve degree of flexibility. [0181] [0181]FIGS. 48 and 49 show an injection mold 86 for producing so-called finger bristles. In this case, the end plate 88 of the plates 87 of each molding channel 71 has several molding channels 98 of a smaller cross-section which conically taper from the separating plane between the end plate 88 and the next plate 87 and being optionally provided with small enlargements at the end. For removal, the end plate 88 is first displaced thereby sizing and stretching the plastic mass located in the molding channels 98. Each individual bristle 9 comprises finger-like extensions 99 at its end. [0182] The molding channels 71 in the injection mold 86 can be aligned with the through holes 7 in the carrier 6 such that the bristles 9 extend perpendicular to the carrier 6 as shown in FIG. 50. The molding channels can also be disposed on the carrier 6 at an angle with respect to the through holes 7 to produce a bristle 100 extending at a corresponding angle. FIG. 51 shows an embodiment wherein the carrier 6 comprises a bristle 101 disposed at an angle and a bent bristle 102 formed by a bend in the corresponding molding channel. [0183] Finally, FIGS. 52 through 54 show some embodiments of composite bristles, which can be produced in accordance with the inventive method. FIG. 52 shows a composite bristle 103 which is formed of a hollow bristle 104 and a core bristle 105. The hollow bristle 104, described with reference to FIGS. 31 and 32, can be injected through annular guiding of the melt through the through holes 7 of the carrier 6 and the core bristle 105 is then injected into the hollow core. In the present embodiment, the hollow bristle 105 comprises perforated holes 106 through which the plastic material of the core bristle 105 outwardly penetrate to form projections 107. The composite bristle 103 in accordance with FIG. 53 consists of a hollow bristle 104 and a core bristle 105 with perforations 108 on the hollow bristle 104 extending in the injection direction through which the melt of the core bristle 105 extrudes to form finger-like projections 109. [0184] In the embodiment in accordance with FIG. 54, the composite bristle 103 consists of a hollow bristle 104 and a core bristle 105, wherein the hollow bristle comprises perforations 110 at its end through which the melt of the core bristle 105 extrudes to form finger-like projections 111. [0185] [0185]FIGS. 55 through 62 show different embodiments of concentric mold elements 140 of an injection mold in cross-section and longitudinal section. FIG. 55 shows a profiled core mold 112 which is e.g. channeled parallel to the axis, and a hollow cylindrical annular mold 113 which define the molding channels 114 at their mutually facing peripheries. FIG. 59 shows the associated longitudinal section. The mold element 140 in accordance with FIG. 56 consists of a core mold 116 and an annular mold 115 both of whose facing surfaces are channeled in the longitudinal direction to define intermediate mold channels 117 having a circular cross-section. FIGS. 57 and 61 and FIGS. 58 and 62 show mold elements 140 having a plurality of concentric dispositions to generate a concentric configuration of molding channels 114, 117. These mold elements 140, which can constitute an independent injection mold or a portion of an injection mold in accordance with FIGS. 36 to 42, can be used to produce a bundled configuration of bristles. These bordering components 112, 113 can preferably be axially displaceable relative to each other, e.g. sequentially from the inside towards the outside, to remove the bristles from the mold following injection of the melt through the carrier through holes and into the molding channels 114, 117. [0186] FIGS. 63 to 68, illustrate additional variants of composite bristles. The composite bristle 103 in accordance with FIG. 63 consists of a massive core 119 and a thin jacket 120 which can be made from different plastic materials or from filled or not filled plastic materials, as described above for composite bristles. The thin jacket 120 can produce a display of wear in connection with the core 119 as the core 119 becomes exposed with increasing wear. [0187] The composite bristle 103 in accordance with FIG. 64 consists of a core 121 and a jacket 122, which is thicker than that of FIG. 61, whereas the three-fold composite bristle 118 consists of a core 123 and an intermediate layer 124 and a jacket 125. [0188] The cross-section of the core and covering bristle must not necessarily be circular. FIG. 66 shows a composite bristle 103 with a triangular core 126 and a jacket 127 supplementing same into a circular shape, whereas FIG. 67 shows a composite bristle 103 with a triangular cross-section with the core 128 being oriented diagonally with respect to the square cover 129. FIG. 68 shows a composite bristle 103 with a longitudinal profile wherein the cross-shaped core 130 extends to the periphery of the second component 131 which otherwise fills the cross-shaped portion. The different hardness and/or different filling of the plastic materials for the core 130 and the cover 131 produces harder working surfaces on the exposed ends of the cross-shaped core. Finally, FIG. 69 shows a composite bristle 103 whose secondary binding forces are reduced through incorporated border layers 132. These are reduced during use or arbitrarily through mechanical forces such that the bristle is split into sector-shaped fingers. 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