Method for coating paper with a plastic pattern

Abstract

A method and apparatus for applying to a surface of a continuous travelling web of paper a regular mesh-like pattern of thermoplastic stripes or strands. The plastic stripes or strands are extruded from nozzles supported a short distance above the travelling web of paper, the nozzles being disposed at the bottom of extrusion heads oscillating transversely to the direction of travel of the web of paper. While the pattern of plastic stripes or strands is applied to a surface of the paper, a vacuum or suction plate disposed against the other surface of the paper draws the plastic through the pores of the paper. The web of paper is subsequently passed through a pair of compression rolls and is air-dried. Additional extrusion nozzles may be provided, which are held stationary such as to apply to the surface of the travelling web of paper longitudinal strands or stripes of plastic at an appropriate distance from each other such, for example, as to correspond to the four corners of a reinforced paper bag, subsequently manufactured from the web of paper using conventional paper bag making machinery.

Dependencies are inferred from the claim text.