Bulk Bag Constructions

Bulk Bags are constructed from a flat woven polypropylene (WPP) fabric in several ways, can be either coated or uncoated, and vary in capacity depending on the Safe Working Load (SWL) or Safety Factor (SF) requirements. 

• Circular Woven – A Circular or Tubular Bulk Bag made from fabric that has been woven into a cylinder or tube of fabric, cut to the correct size. This tubular body design is ideal as a liner-less option for fine materials. 
• Baffle Bags – Form-stable or Baffle Bags have corner baffles sewn in to maintain their shape when they are filled, allowing the product material to flow into all corners of the Bulk Bag and optimising packing. 
• Hyperbolic™ Bags – Exclusive to Polesy in Australia, Hyperbolic™ Bulk Bags provide the benefits of a traditional Baffle Bag without the need for sewn in baffles, reducing cost, weight, and complexity of manufacture, and allowing for quicker and easier filling and discharge. 
• U-Panel Bags – Made from 2 pieces of fabric with 2 seams along 2 opposite sides 
  to create 2 panels into a “U” panel shape. 
• Four+One Panel Bags – the original WPP Bulk Bag design – requires seams along five separate pieces of fabric sewn to create a four+one panel bag. 
• Ventilated Bags – A section of each side of the Bulk Bag is vented to allow airflow throughout the contents of the bag, most suitable for use in the agriculture industry for produce such as onions, potatoes, and garlic. 

Bulk Bags are also designed as either Single Trip bags (to be used for one filling and discharge only) or Multiple Trip bags (which are reuseable, for multiple fillings and discharges).