APPARATUS FOR PERFORATING PLASTER TAPES Russian patent published in 1998 - IPC

FIELD: plaster tape perforation. SUBSTANCE: apparatus for perforating plaster tapes with adhesive carrying layer and protection material layer includes hollow rotary tubular housing 1. Several drilled radial seat punches 6,6a are arranged on surface of housing 1. Punches are in the form of one part with rotary body or one part with rotary body having removable sectors and they have cutting edges 7,7a near inlet portion of opening inside which small stacks of punched out circles are placed. Stacks together with opening take part in process of removing punched out circles from protective material. Punches have supporting drive unit 2. Plaster tape 3 is pulled between unit 2 and housing 1 synchronously with rotation of housing 1 in such a way that gap is provided between cutting edges and unit 2. Apparatus allows to form openings in plaster surface by cold perforation without significant damage of protective material layer. EFFECT: possibility of reuse of plaster tape, formation of identical flaw-free openings, elimination of damage of protective layer. 10 cl, 5 dwg