Trim and producing method thereof

A method for producing a channel-shaped trim including a core member embedded within a covering material and having a longitudinally extending opening for embracing and clamping an edge flange of a support member comprising the steps of:

• preparing a band-shaped metal network comprised of a deformable material by forming a plurality of connecting portions and a plurality of lozenge shaped spaces which are linearly disposed in rows in both the longitudinal and transverse directions of the trim, respectively, each space being disposed between adjacent connecting portions in both the longitudinal and transverse directions of the trim;
• forming predetermined ones of the connecting portions as weakened portions which are easily broken by bending stresses applied in a direction perpendicular to the longitudinal direction of the network;
• said weakened portions being comprised of all connecting portions which are disposed in every other transversely extending row;
• covering the network with a covering material to form a covered network;
• applying bending stress to the covered network in a direction perpendicular to the longitudinal direction thereof to break the weakened connection portions thereby separating the network at predetermined locations along the length thereof;
• and
• bending the covered network in the transverse direction to form a longitudinally extending channel-shaped opening in the trim and in the core member composed of the separated network embedded within the covering material.