Method of producing a brush for the personal care field

Patent metadata

Field	Value
Publication number	US-9526595-B2
Application number	US-201313963392-A
Country	US
Kind code	B2
Filing date	Aug 9, 2013
Priority date	Oct 24, 2007
Publication date	Dec 27, 2016
Grant date	Dec 27, 2016

Abstract

The wire of the interdental treatment part is inserted into a shaft opening of the injection molding tool, preferably into a strip of the injecting molding tool such that said treatment part projects with a mounting section thereof into a cavity connected to the shaft opening. Preferably, a first cavity section is configured is configured on the strip, and a second cavity section is configured on a cavity body, to with the strip abuts at least during the injection molding process. After injection of plastic into the cavity, and after the at least partial curing thereof, the handle part thus formed is moved by a distance in the direction against the cavity along with the interdental treatment part, and the handle part is removed from the opened injection molding tool.

First claim

What is claimed is:

1. A method of producing a brush for the personal care field by means of multi-component injection molding with an injection mold comprising at least a clamping bar and a cavity body, the clamping bar defining a first cavity portion of a cavity of the injection mold, and the cavity body defining a second cavity portion of the cavity of the injection mold, the method comprising at least the following steps:
(a) inserting a stem being made from a wire and bearing a treatment head into a stem aperture of the clamping bar of the injection mold such that a fastening portion of the wire projects into an open cavity of the injection mold;
(b) closing the injection mold by bringing the clamping bar and the cavity body into abutment such that the first cavity portion and the second cavity portion form a closed cavity of the injection mold;
(c) injecting a first plastics material into the closed cavity such that the fastening portion of the wire is encapsulated, wherein a handle of the brush is produced and an encircling groove is formed in the handle substantially by means of an encircling bead of the clamping bar;
(d) opening the injection mold;
(e) performing, by means of the encircling bead of the clamping bar engaging in the groove of the handle, a changeover from the second cavity portion into a further second cavity portion; and
(f) injecting a second plastics material into the further second cavity portion.

2. The method as claimed in claim 1 , wherein the first plastics material which is injected in step (c) is a hard plastics material for forming the handle of the brush.

3. The method as claimed in claim 1 , wherein the second plastics material which is injected in step (f) is a soft plastics material.

4. The method as claimed in claim 1 , wherein the brush includes a tooth-cleaning device comprising an interdental treatment part or a mascara brush.

5. The method as claimed in claim 1 , wherein steps (d) to (f) are repeated analogously.

Assignees

• Trisa Holding Ag

Inventors

• Pfenniger Philipp

Classifications

• A61C15/02 Primary

  Toothpicks · CPC title

• A46B2200/108

  Inter-dental toothbrush, i.e. for cleaning interdental spaces specifically · CPC title

• B29L2031/425

  Toothbrush · CPC title

• B29C45/162

  using means, e.g. mould parts, for transferring an injected part between moulding stations · CPC title

• B29C45/14426

  Coating the end of wire-like or rod-like or cable-like or blade-like or belt-like articles · CPC title