... /double walls paper cups/bowls such as direct-sleeve cups, hollow-sleeve cups, rippled/cor WT-30 Automatic Double Wall ... after running a whole procedure of automatic paper (fan-sleeve) feeding, sleeve-cone-body sealing (by ultrasonic wave), water-glue spraying ... cups/bowls such as direct-sleeve cups, hollow-sleeve cups, rippled/corrugated-sleeve paper cups etc. The sleeve-wrapped paper cups are popular ...