Attachment of tape sections to a material strip used in diaper manufacture involves ultrasonic welding of cut tapes at intervals along a strip of material

摘要

Tape sections (17) cut from strip (1) are ultrasonically welded onto a continuously moving material strip (9) at points whose spacing can be selected to suit requirements. Use of a cutting roll (3) and an opposing suction roll (2) enables tape sections (17) to be cut without gap in the longitudinal direction. Different spacing of tape sections on the material strip (9) are achieved by a difference in speeds or by the speed ratio (V8/V5) between a tape section transfer roll (5) and a welding drum (8). Ultrasonic vibration is produced by a fixed ultrasonic horn (18) or the transfer roll may form a rotating sonic horn and welding occurs between the transfer roll and an opposing suction roll (2). With Y-shaped tape sections the inner sides of the shanks may or may not have an adhesive coating or only one is adhesively coated. Deflecting rolls (14) ensure the material strip (9) wraps around not less than2[deg] of the welding drum so that a tape section is drawn by vacuum onto the welding drum and synchronously transported away on the material strip. Material strip (9) is guided tangentially between the welding drum and ultrasonic horn and each tape se ction is transported by the welding drum to a welding position (11) below the horn. Alternatively a cold welding embossing roll may be employed to produce a cold weld between tape section and material strip. An independent claim is included for the process equipment which includes an opposing suction roller for moving tape sections to a transfer roll for placing them on a moving material strip and a welding unit for attachment of tape sections to the material strip.