Method and device for producing a brush

A method for producing a brush, which comprises a bristle carrier made from a thermoplastic resin having a front side and a back side and at least one opening, the at least one opening does not extend completely through the bristle carrier, the at least one opening being encompassed by a rim at the front side, in which at least one bristle made of thermoplastic resin is inserted and anchored therein without using an anchor, so that it protrudes from the front side of the bristle carrier, characterized by the following steps:

• the at least one bristle is accommodated in a receiving opening of a tool part,
• the at least one bristle is inserted into the at least one opening in the bristle carrier, which has been formed during producing the bristle carrier, with the fastening end thereof, while the least one bristle is still located in the receiving opening,
• the distance of the tool part to the bristle carrier is reduced, so that a front face of the tool part opposed to the front side of the bristle carrier contacts the front side of the bristle carrier,
• the front side of the bristle carrier is heated to a temperature below the melting temperature of the bristle material and/or below the bristle carrier material, in particular to a maximum 85% in ° C. of the respective melting temperature of the bristle and/or the bristle carrier material,
• the tool part applies a pressure force on the heated bristle carrier, and reshapes the bristle carrier at least in the area of the rim encompassing the opening by reducing the cross-section of the opening in a way, that at least one bristle is embedded and anchored in the opening,
• the back side of the bristle carrier is actively cooled, while the pressure force is applied on the bristle carrier, and
• the distance of the tool part to the bristle carrier is enlarged, thus the at least one bristle is pulled out of the receiving opening,
• the application of the pressure force is carried out in an apparatus, in which the bristle carrier is contacted on the front side thereof by a tool part and on the back side thereof by a holder having a front face, while a pressure force is applied on the bristle carrier.

A method for producing a brush, which comprises a bristle carrier made from a thermoplastic resin having a front side and a back side and at least one opening, the at least one opening does not extend completely through the bristle carrier, the at least one opening being encompassed by a rim at the front side, in which at least one bristle made of thermoplastic resin is inserted and anchored therein without using an anchor, so that it protrudes from the front side of the bristle carrier, characterized by the following steps:

• the at least one bristle is accommodated in a receiving opening of a tool part,
• the at least one bristle is inserted into the at least one opening in the bristle carrier, which has been formed during producing the bristle carrier, with the fastening end thereof, while the least one bristle is still located in the receiving opening,
• the distance of the tool part to the bristle carrier is reduced, so that a front face of the tool part opposed to the front side of the bristle carrier contacts the front side of the bristle carrier,
• the front side of the bristle carrier is heated to a temperature below the melting temperature of the bristle material and/or below the bristle carrier material, in particular to a maximum 85% in ° C. of the respective melting temperature of the bristle and/or the bristle carrier material,
• the tool part applies a pressure force on the heated bristle carrier, and reshapes the bristle carrier at least in the area of the rim encompassing the opening by reducing the cross-section of the opening in a way, that at least one bristle is embedded and anchored in the opening,
• the distance of the tool part to the bristle carrier is enlarged, thus the at least one bristle is pulled out of the receiving opening,
• the application of the pressure force is carried out in an apparatus, in which the bristle carrier is contacted on the front side thereof by a tool part and on the back side thereof by a holder having a front face, while a pressure force is applied on the bristle carrier, and
• an air gap is provided at least in sections between the wall and the at least one bristle in the region of the bottom or adjacent to the bottom of the opening in the bristle carrier.