Leak Proof Square Bottom Paper Bag Production Line

Bag size

Machine Floor Plan

Bag Bottom Forming Module

Blowing Bottom Opening Mechanism: Solenoid valves control the front and rear air blowing mechanisms. High-pressure air precisely opens the bag bottom, preforming a hexagonal shape for the bottom folding process.
Hot Sealing Unit: Instantaneous high-temperature lamination creates a sealed edge, ensuring water and leak resistance.
Intelligent Control System
Human-Machine Interface: A touchscreen provides centralized control, displaying real-time fault alerts and allowing fine-tuning of parameters (such as temperature and speed).
PLC + Photoelectric Detection: A photoelectric sensor coupled to a servo motor enables functions such as no-material shutdown and bag clamping detection.
Multifunctional Actuator
Clamping System: The folding and bag opening clamping plates work together to secure the bag. A vibration mechanism compacts the contents and reduces air in the bag.
Valve Tape Mechanism: Automatically applies reinforced liner paper to improve load-bearing capacity. 

Brief Description

Material

1.PE/PLA/CPP/PBCA Coated Paper
2. Water Based Coating Paper
3.Material Thickness
Paper Thickness：50~100gsm
Coating Thickness：10~30um
4.Reel Feeding Width：560~1200mm
5.bag Sizes
Width：150~420mm
Height：200~500mm
Gusset：70-170mm
Side Welding Margin：15~30mm
Bottom Welding Margin：20~35mm
Non-glue, Water Glue, Hotmelt Glue, Pur Glue

Machine Dscription

Cutting tolerance: + 1mm.
Color code: 20mm*5mm or bigger, vertical distance from similar pattern printing to color-code must be longer than 20mm.
Coating thickness uniform: tolerance must be less than +3um
Welding temperature: 90~260℃

1)Paper Reel
2)Gusset Tubing
3)Tube margin Welding
4)Rotary Cutting
5)Creasing
6)Bottom Opening
7)90°Rotating
8)Bottom Flap Pre-folding
9)Bottom Erecting
10)Bottom Forming 
11)Bottom Welding
12)90°Rotating
13)Bottom Triangle Gluing
14)Bottom Triangle Folding In
15)Bottom Triangle Pressing
16)Bag Bottom Gluing
17)Reinforcement Pasting
18)Bag Output
19)Stacking Dressing & Collecting
20)Reinforcement Reel Feeding