To prepare an adhesive tape that can be easily torn by hand in either of longitudinal or lateral directions and is useful for corrugated cardboard having a large repulsion strength by the use of a substrate whose lateral and longitudinal breaking strengths have been adjusted to be within a specific range.
This adhesive tape comprises a substrate having breaking strength of 40-5000g/20mm in longitudinal and lateral directions and an adhesive layer formed at least on one face of the substrate. The substrate is a composite substrate composed of a film having through pores or unpenetrating pores whose depth is 10-90% of the film thickness and plastic films that are provided on both faces of the multi-pored film and have no through pores. Preferably this composite substrate is provided with 500 or more through pores per cm2 of the substrate.
ONISHI HIROHITO
IKEDA KOICHI
KONO NAOKI