APPLICATION OF FLUIDIZED MATERIAL TO A SUBSTRATE USING INTERMITTENT CHARGES OF COMPRESSED AIR.

摘要

This invention relates to the treatment of substrates 21 with fluidized material in repetitive patterns 82 during application cycles. The treatment patterns made with this invention can be altered by changing machine operating parameters. The patterns of fluidized material are applied to substrates using intermittent charges of compressed air. The intermittent charges of compressed air pass through a venturi slot in an applicator 40 which creates a region of low pressure in the charges adjacent to a region where the fluidized material accumulates between application cycles. This region of low pressure helps to entrain the fluidized material in the charge of compressed air. After the fluidized material is entrained in the charge of compressed air, the charge deposits the fluidized material on the substrate.