Process

Apparatus for making a toothbrush head, comprising:

• an injection mould which comprises first and second mould blocks which include a respective first and second part mould cavity and which mate at a primary split line, so that the part mould cavities combine to form a mould cavity suitable to enclose a plastic material head part having a first surface in which bristles are mounted or are to be mounted, and having an opposite surface on which an elastomer material part is to be formed, the first and second surfaces being distanced by a side surface, the mould cavity defining at least part of the elastomer part to be formed, the injection mould being adapted for introduction of a thermoplastic elastomer material into the second mould cavity to thereby form the elastomer material part, characterised in that:
• the mould block is provided with means to allow air to vent from the mould cavity during introduction of the thermoplastic elastomer material into the mould cavity other than via the primary split line.

Process for making a toothbrush head, comprising;

• providing a plastic material head part having a first surface in which bristles are mounted or are to be mounted, and having an opposite surface on which an elastomer material part is to be formed, the first and second surfaces being distanced by a side surface, enclosing the head part in an injection mould cavity deeming at least part of an elastomer part, particularly an elastomer material part which comprises one or more rib having an elongate direction across the longitudinal direction, and extending from the second surface in a height direction perpendicular to a plane between the first and second surfaces to be formed therein, introducing a thermoplastic elastomer material into the injection mould cavity to thereby form the elastomer material part, characterised in that the fluid thermoplastic elastomer material is injected into the injection mould cavity at a temperature of 240-260° C.

Process for making a toothbrush head, comprising;

• providing a plastic material head part having a first surface in which bristles are mounted or are to be mounted, and having an opposite surface on which an elastomer material part is to be formed, the first and second surfaces being distanced by a side surface, enclosing the head part in an injection mould cavity defining at least part of an elastomer part, particularly an elastomer material part which comprises one or more rib having an elongate direction across the longitudinal direction, and extending from the second surface in a height direction perpendicular to a plane between the first and second surfaces to be formed therein, introducing a thermoplastic elastomer material into the second mould cavity to thereby form the elastomer material part, characterised in that subsequent to the injection of the thermoplastic elastomer material into the injection mould cavity the head part with the so-formed elastomer material part is ejected from the mould cavity at a temperature above 20° C.