Process for the manufacture of brushes by injection moulding

Details Process for the manufacture of brushes by injection moulding Process for the manufacture of brushes by injection moulding

A - Human Necessities

46

B

A46B 3/04 (2006.01) A46D 3/00 (2006.01) B29C 45/14 (2006.01)

Patent

CA 2183580

A process for the production of brushware having a plastic bristle carrier and a bristle bundle fixed to the carrier and constituted of stretched, stabilized plastic monofilaments. An open injection mould is provided defining a cavity in which the bristle carrier is moulded with one part of the mould having a channel in which the bristle bundle is guided with an end of each bristle bundle projecting beyond a mouth of the channel and being melted to a thickening having a cross section greater than a cross section of the channel and the bundle which anchors the bundle to the carrier with the thickening being spaced a distance from the mouth of the channel. The injection mould is closed to define the cavity and a plastic melt is injected into the cavity with the distance of the thickening of the bristle bundle from the mouth of the channel permitting air and any degassing products from the plastic melt to be removed through the channel and being of sufficient length so that a length of thermally weakened monofilaments produced by a molecular reorientation during melting of the end of the bristle bundle to form the thickening area surrounded by the plastic melt without the plastic melt penetrating the channel. The bundle is positioned and fixed in the channel so that the distance, depending upon a diameter of the monofilaments, is between 0.1 mm and 2.0 mm.

Les brosses composées d'un support en matière plastique et d'au moins un assemblage de soies fixé à celui-ci, constitué de monofilaments de plastique (5) étirés et stabilisés, sont fabriquées comme suit: l'assemblage de soies introduit dans un canal d'un demi-moule (2) d'injection destiné au support présente, à son extrémité pénétrant dans la cavité du moule d'injection, une partie renflée (7) de section supérieure à celle de l'assemblage de soies ou d'un groupe d'assemblages de soies et est incorporé dans le moule fermé par injection de la matière plastique en fusion destinée à former le support. Afin de produire des brosses de qualité irréprochable, on calcule la distance (C) entre la partie renflée et les parois du moule de façon à ce que, d'une part, l'air repoussé dans la cavité du moule lors de l'injection de la matière plastique en fusion et les produits de dégazage éventuels provenant de la matière plastique en fusion soient évacués par le canal (2), et d'autre part, de façon à ce qu'au moins la partie allongée des monofilaments (5) ramollie thermiquement par réorientation moléculaire lors de la fusion des monofilaments (5) soit entourée de matière plastique en fusion sans que celle-ci ne pénètre dans le canal (2).

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