Abstract: A device (17) for the production of brushes (1, 1a) that have a twisted carrier part (3) made from wire sections (2) with a set of bristles (4) and a handle-side and/or a head-side overmolding (5, 6) has an injection molding tool for holding and for the overmolding of the head-side or handle-side end region of a brush pre-form (32). The tool has a mold part (33) with a passage (13) for the end region. In this way, a mechanism (20) for the attachment or introduction of a sealing element (7) is provided on the carrier part (3), wherein this sealing element (7) is arranged in the region of the passage (13) for the overmolding and seals this passage.

Abstract: An injection-molding machine having a stack mold for producing injection-molded parts, has first and second external mold parts and a rotatably mounted central block, the external mold parts each having a distribution plate having a hot runner for the injection material, and mold cavities being formed between molding regions on inner sides of the mold plates of the external mold parts and molding regions being formed on mold plates on opposite outer sides of the central block. At least one gripper is provided. The mold plates of the external mold parts and the central block are held detachably in place. The mold plates of the external mold parts are positionable on the distribution plates to correspond to respective feed channels, and the mold plates of the central block are positionable on the central block to correspond to respective positions of the mold plates of the external mold parts.

Abstract: A device (17) for the production of brushes (1, 1a) that have a twisted carrier part (3) made from wire sections (2) with a set of bristles (4) and a handle-side and/or a head-side overmolding (5, 6) has an injection molding tool for holding and for the overmolding of the head-side or handle-side end region of a brush pre-form (32). The tool has a mold part (33) with a passage (13) for the end region. In this way, a mechanism (20) for the attachment or introduction of a sealing element (7) is provided on the carrier part (3), wherein this sealing element (7) is arranged in the region of the passage (13) for the overmolding and seals this passage.

Abstract: An injection molding machine for the manufacture of injection molded items, especially toothbrush bodies or toothbrushes, wherein the injection molding machine includes a mold-containing injection die (1) and an injection unit (2), especially with a screw-piston extruder or a similar material transport system. Distribution or transport channels lead from the injection unit (2) forming a distribution channel arrangement (4) to the individual mold cavities (5). One or more feeds (10) are located on the distribution channels and/or the mold cavities for at least one additive, for instance, a liquid color.

Abstract: An apparatus and method for making thermoplastic brushes includes a first unit for injection molding an anchoring plate having through openings for tufts of bristles. The apparatus further includes an arrangement for inserting the tufts in the openings so that an end portion of each tuft is adjacent a first side of the anchoring plate and a major portion of each tuft projects beyond the opposite second side of the anchoring plate. A heating plate is provided to form welds between the end portions of the tufts and the anchoring plate, and between the individual bristles of the tufts. This seals the through openings at the first side of the anchoring plate. The apparatus additionally includes a second unit for injection molding a covering member over the first side of the anchoring plate. To make a brush, the anchoring plate is injection molded using the first unit and the tufts are welded to the anchoring plate.