Molding element for tire

A molding element for equipping a mold for molding a tread and intended to mold in this tread an incision of circular shape around an axis XX′, the main opposing walls of which are connected by a plurality of connecting bridges of rubber mix, said molding element comprising two molding parts, each molding part being formed by a support extended by at least one molding blade for molding part of said incision, at least one of the molding parts comprising a support extended by a blade which is at least partially helical around the axis XX′, said support being mounted freely in rotation around XX′ relative to the other molding part, the blades of said molding parts cooperating to define a plurality of orifices intended for molding the connecting bridges, the molding element being characterized in that:

• the molding blades of a first molding part are provided with passages arranged so as to permit the engagement by sliding of the molding blades of the second molding part within said passages to form the molding element in the molding configuration and thus to form a plurality of orifices intended to allow the rubber mix to pass for molding the connecting bridges, and in that
• the support of the second molding part is mounted so as to be mobile in translation relative to the first molding part, to permit the engagement of the blades of said second molding part in the passages provided on the first molding part and the disengagement thereof during demolding.