Apparatus for forming slant, linear easy-to-tear portions on long plastic film

摘要

An apparatus for forming slant, linear easy-to-tear portions on a long plastic film, comprising a roll on which the long plastic film passes, pluralities of pattern rolls each partially having a slant, linear stamp on a rolling surface, a shaft to which pluralities of the pattern rolls are fixed, and a first mechanism for moving the shaft in a direction to the roll. Pressure rolls pushing the pattern rolls via rolls fixed to the shaft. A second moving mechanism for moving the pressure rolls in a direction to the pattern rolls, whereby with the pressure rolls pushing the pattern rolls by the second moving mechanism, the stamp of the pattern rolls are pressed onto the elastic film by the first moving mechanism, so that the slant, linear easy-to-tear portions with recesses formed by the pattern projections of the stamp are provided partially and periodically on the plastic film.

主权项

1. An apparatus for forming slant, linear easy-to-tear portions on a long plastic film, comprising:
(a) a roll on which the long plastic film passes; (b) pluralities of pattern rolls each partially having a slant, linear stamp means having pattern projections on a rolling surface; (c) a shaft to which the pluralities of the pattern rolls are fixed; (d) a first moving mechanism for moving said shaft in a direction to said roll, on which the long plastic film passes; (e) pressure rolls pushing said pattern rolls directly or indirectly via rolls fixed to said shaft, which have a smaller diameter than that of the pattern rolls; and (f) a second moving mechanism for moving said pressure rolls in a direction to said pattern rolls, whereby with said pressure rolls pushing said pattern rolls directly or indirectly by said second moving mechanism, the stamp means of said pattern rolls are pressed onto said plastic film by said first moving mechanism, so that the slant, linear easy-to-tear portions with recesses formed by the pattern projections of said stamp means are provided partially and periodically on said plastic film.