In the method according to the invention, a wire (11) provided with teeth (15) passes sequentially through a first inductor (16) and a second inductor (18). The inductors (16, 18) function at different frequencies and generate different temperatures. The first inductor (16) heats in particular the base section (17), which is not to be hardened, to a high temperature below the austenitizing temperature range. The second inductor (18) heats the teeth (15) to a still higher second temperature within the austenitizing temperature range. Defined, hardened teeth of consistently high quality result at quenching.

In the method according to the invention, a wire (11) provided with teeth (15) passes sequentially through a first inductor (16) and a second inductor (18). The inductors (16, 18) function at different frequencies and generate different temperatures. The first inductor (16) heats in particular the base section (17), which is not to be hardened, to a high temperature below the austenitizing temperature range. The second inductor (18) heats the teeth (15) to a still higher second temperature within the austenitizing temperature range. Defined, hardened teeth of consistently high quality result at quenching.

A card clothing wire (1) for use on drums in cards has a root (2) and a blade (3) having an overall height of the wire (h.sub.1) of 1.5 mm to 5 mm. The blade (3) is provided with teeth (4) having a tooth depth (h.sub.6) of 0.35 mm to 1.0 mm, and having a tooth pitch (p) of 1.5 mm to 3 mm. The teeth (4) have a tip surface (7), a back surface (8) having a back angle (), and a tooth face surface. The back angle () is 40 to 20 and each tooth (4) has a first tip (5) and a second tip (6) and the tip surface (7) has at least one elevation (9).

A card clothing wire (1) for use on drums in cards has a root (2) and a blade (3) having an overall height of the wire (h.sub.1) of 1.5 mm to 5 mm. The blade (3) is provided with teeth (4) having a tooth depth (h.sub.6) of 0.35 mm to 1.0 mm, and having a tooth pitch (p) of 1.5 mm to 3 mm. The teeth (4) have a tip surface (7), a back surface (8) having a back angle (), and a tooth face surface. The back angle () is 40 to 20 and each tooth (4) has a first tip (5) and a second tip (6) and the tip surface (7) has at least one elevation (9).

A method of hardening a clothing wire for processing textile fibres and to an apparatus system therefor. The clothing wire has a succession of teeth arranged in its longitudinal direction, and the clothing wire is guided through a heating region in a pass-through direction for contact with at least one open flame. The heating region is followed by a quenching bath having a quenching liquid and by a subsequent tempering apparatus. The clothing wire moving in the pass-through direction is flushed around with a protective medium in a transition region between the region of contact with the open flame and the entry into the quenching liquid.

A method of hardening a clothing wire for processing textile fibres and to an apparatus system therefor. The clothing wire has a succession of teeth arranged in its longitudinal direction, and the clothing wire is guided through a heating region in a pass-through direction for contact with at least one open flame. The heating region is followed by a quenching bath having a quenching liquid and by a subsequent tempering apparatus. The clothing wire moving in the pass-through direction is flushed around with a protective medium in a transition region between the region of contact with the open flame and the entry into the quenching liquid.

An all-steel clothing for a flat card or roller card for processing textile fibres includes a sawtooth wire having teeth arranged one after another in a wire running direction. The tooth contour of the teeth is defined, starting from a tooth base, as at least transitioning into a tooth back, further transitioning into a tooth tip portion, further transitioning into a tooth face and again transitioning into a subsequent tooth base. The tooth tip portion has a predetermined tooth tip length (L) in the wire running direction and a tooth prominence on top of a part of the tooth tip portion. The tooth prominence has a tooth prominence length (l) which is less than the tooth tip length (L).

An all-steel clothing for a flat card or roller card for processing textile fibres includes a sawtooth wire having teeth arranged one after another in a wire running direction. The tooth contour of the teeth is defined, starting from a tooth base, as at least transitioning into a tooth back, further transitioning into a tooth tip portion, further transitioning into a tooth face and again transitioning into a subsequent tooth base. The tooth tip portion has a predetermined tooth tip length (L) in the wire running direction and a tooth prominence on top of a part of the tooth tip portion. The tooth prominence has a tooth prominence length (l) which is less than the tooth tip length (L).

The metallic card wire (100) includes a rib portion (110) and a plurality of teeth (115). The teeth have a tip segment (117), a front portion (120), a back portion (130), two sides (141, 142) and an interconnection section connecting the back portion of a tooth to the front portion of the previous tooth. The teeth lean in the card wire longitudinal direction. The teeth's front portion leans towards the longitudinal direction. The front portion includes an undercut segment where the included angles of the tangents to the front portion with the longitudinal direction of the card wire are smaller than the included angles of the tangents to the front portion with the longitudinal direction of the card wire between the undercut segment and the tip segment. At least one side of the teeth includes at least a first structural element for increasing the frictional force of fibers relative to the side of the teeth and positioned closer to the tip segment compared to the undercut segment's position.

The metallic card wire (100) includes a rib portion (110) and a plurality of teeth (115). The teeth have a tip segment (117), a front portion (120), a back portion (130), two sides (141, 142) and an interconnection section connecting the back portion of a tooth to the front portion of the previous tooth. The teeth lean in the card wire longitudinal direction. The teeth's front portion leans towards the longitudinal direction. The front portion includes an undercut segment where the included angles of the tangents to the front portion with the longitudinal direction of the card wire are smaller than the included angles of the tangents to the front portion with the longitudinal direction of the card wire between the undercut segment and the tip segment. At least one side of the teeth includes at least a first structural element for increasing the frictional force of fibers relative to the side of the teeth and positioned closer to the tip segment compared to the undercut segment's position.