You may see a lot of V bottom paper bag with window attached, but actually square bottom paper bag with various shape window attached is also frequently used in bread store, but the technology is much higher than V bottom type.
Standard design of square bottom paper bag with window attached
From Longitudinal type gluing to Servo type gluing, we continually update our gluing attached technology and mould. And the glue both are eco-friendly water-based glue, east to dry. We use this technology in two-layer kraft paper pasting and opp film with kraft paper pasting, and the kraft paper is vergin paper without PE laminated. And there is a secret, when we gluing on the opp film, the bag will be flat and beautiful. Then the paper will not absorb the water from the glue.
Let us see how the longitudinal type and servo type gluing:
1.Longitudinal type gluing by several glue gun.
2.Servo type gluing control by rotary cylinder and servo motor.
There we would like to talk about the window attached paper bag machine
Please take a view of the window bag forming as below: