초록 ▼

An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressur

An apparatus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable molding element means for receiving the film and which means has a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas are imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction.

대표청구항 ▼

1. An appratus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired

1. An appratus for the manufacture of selectively apertured thermoplastic sheet or film, comprising a rotatable a predetermined pattern therein wherein as the film is contacted with the rotatable molding element means and a fluid pressure differential is applied to the surface of the film, a desired pattern of perforated areas and non-perforated areas is imparted to the film with each of said areas being continuous across the web of the film and alternating in the machine direction, said rotatable molding element means comprising a cylindrically shaped base pattern screen having a plurality of openings therein arranged in a predetermined pattern, an airflow restrictor means mounted over the outer surface of a portion of said base pattern screen for providing localized restriction of airflow through the screen whereby the pressure differential applied to the surface of the film is changed resulting in a continuously patterned, selectively apertured film of a desired repetitive pattern, said airflow restrictor means being a spunbonded-nonwoven breathable thermally resistant sheet material and an overlay screen mounted over said airflow restrictor means and secured on said base pattern screen. 2. The apparatus of claim 1, wherein said airflow restrictor means is spunbonded-nonwoven remay polyester cloth. 3. The apparatus of claim 2, wherein said spunbonded-nonwoven remay polyester cloth is two layers of said cloth. 4. The apparatus of claim 2, wherein said spunbonded-nonwoven remay polyester cloth is two layers of said cloth each of about 5 mils in thickness.