Method for the production of an interdental cleaner
An interdental cleaner has a rod-shaped carrier formed of plastic, which has a structuring with structural elements radially protruding from the carrier on at least one section of an axial length thereof. The carrier is twisted in at least one part of the section having the structuring together with the structuring about a carrier longitudinal axis.
1. A method for manufacturing an interdental cleaner, the method comprising the steps of:
a rod-shaped carrier formed of plastic and provided with a carrier section having a structuring with structural elements protruding radially from the carrier on at least one section of an axial length;
twisting the carrier together with the structuring about a carrier longitudinal axis (L) in at least one part of the carrier section having the structuring;
grasping the carrier, with holding devices, in two areas located at axially spaced locations from one another;
twisting the holding devices relative to one another with the carrier grasped by the holding devices; and
changing a mutual distance between the holding devices during the twisting of the carrier.
2. A method in accordance with claim 1 , wherein the mutual distance between the holding devices is changed continuously during the twisting of the carrier.
3. A method in accordance with claim 1 , further comprising heating the carrier before the twisting or during the twisting or both before the twisting and during the twisting.
4. A method in accordance with claim 1 , wherein the twisting provides a permanent torsional deformation of the carrier that leads to a twisting of the structuring over an angle of that is greater than 30°.
5. A method in accordance with claim 4 , wherein the twisting provides a permanent torsional deformation of the carrier that provides a twisting of the structuring over an angle of in a range of 60° to 360°.
6. A method in accordance with claim 4 , wherein the twisting provides a permanent torsional deformation of the carrier that provides a twisting of the structuring over an angle of in a range of 60° to 120°.
7. A method in accordance with claim 4 , wherein the twisting provides a permanent torsional deformation of the carrier that provides a twisting of the structuring over an angle of in a range of 90°±20°.
8. A method in accordance with claim 1 , wherein the carrier is provided with a sleeved coating in an area of the structuring.
9. A method in accordance with claim 8 , wherein the structuring has radially protruding fingers or radially protruding lips or both radially protruding fingers and radially protruding lips, which are made integrally in one piece with the coating.
10. A method in accordance with claim 8 , wherein the structuring has radially protruding bristles, which are embedded in the carrier or in the coating or are embedded in both the carrier and in the coating.
11. A method in accordance with claim 10 , wherein the bristles are positioned, located in one plane together with the carrier, in an injection mold, extrusion-coated in this while the coating is formed, and are subsequently cut to a desired length.
12. A method in accordance with claim 11 , wherein the bristles, located in one plane, are extrusion-coated in an injection mold while the carrier is formed, and the bristles are cut to a desired length in a subsequent method step.
13. A method in accordance with claim 8 , wherein the carrier is twisted together with the coating and with the bristles and/or with the fingers and/or the lips ( 19 ).