Patent ID: 6099916
Filing Date: 2000-08-08
Classification: B05C,B05D

Abstract:
A method of gumming at least a portion of a sheet material, the method comprising the steps of feeding said sheet material (2) along a path (P) directly facing a surface (25) of a bath of gum (8), generating an electric field over at least one portion (9) of said sheet material (2) to draw the gum (8) from said bath onto said portion (9), generating in said bath of gum (8) at least one static wave (27) facing said portion (9) of said sheet material (2), said electric field being generated in correspondence with said static wave (27), wherein said electric field is generated, at successive instants in the travel of said sheet material (2), at various portions (9) of said sheet material (2) arranged in a predetermined gumming pattern.