ZB4900(SS) bags feed-in device
    ZB4900 bags feed-in device is used to feed the filled bags into the sewing machine and fold over the bag top. This model is used together with the GK series automatic bag closing sewing machines.
    ZB4900 made by normal carbon steel with folding function
    ZB4900SS made by stainless steel with folding function
    ZB4900-1 made by normal carbon steel without folding function
    ZB4900SS-1 made by stainless steel without folding function
Then, what is the main difference between ZB4900 and ZB6900?
    Firstly, the 4900 feed bags with belts while the 6900 feed bags with chains.
    Secondly, the 4900 feed bags only to the presser before sewing while the 6900 feed bags until sewing completed.