flexible intermediate bulk container (FIBC), jumbobulk bagsuper sackbig bag, or tonne bag is an industrial container made of flexible fabric that is designed for storing and transporting dry, flowable products, such as sand, fertilizer, and granules of plastic.

FIBCs are most often made of thick woven strands of oriented polypropylene,[4] either coated or uncoated, and normally measure around 45–48 inches (114–122 cm) in diameter and varies in height from 100 to 200 cm (39 to 79 inches). Its capacity is normally around 1,000 kg or 2,200 lb, but the larger units can store even more. A FIBC designed to transport one metric ton (0.98 long tons; 1.1 short tons) of material will itself only weigh 5–7 lb (2.3–3.2 kg).

Types of Flexible Intermediate Bulk Container

Styles of Bag Construction:

Circular – This style of bag is made on the loom as a tube and is the lowest standard of FIBC. It will not maintain its shape when loaded and will sit down and bulge out in the middle.  It will resemble a tomato when loaded, as the product will stretch the fabric when it is subjected to the pressure of the product being loaded. Normally it would have cross corner lifting loops.

U-Panel – A U-panel bag is a step up from a circular bag, as it will have two pieces of fabric resembling a U shape that are sewn together to make the shape of the bag. It will maintain its square shape much better than the circular style.

Four-Panel – The four-panel bag is the best bag for staying square other than a baffle bag. It is made of up four pieces of fabric that make up the sides and one for the bottom.  These are all sewn together which resists the stretching tendencies of the bag and holds it in a cube shape much better.

Baffle – This style will be the best at keeping the cube shape of your product when the bag is loaded. It has additional baffles sewn down each corner to act as a pocket to fill each corner.  In addition, there are other pockets sewn on each side for all the product to gather around the baffles and pockets.  These are perfect if you have a small diameter product such as soybeans which can flow through the baffles without getting hung up.  These bulk bags will be easier to stack as they will make a nice square cube.

Specialty bags:

  • Pharmaceutical – similar to food grade certifications
  • UN certified – will have to undergo many tests to ensure it can withstand the stress and still eliminate spillage of hazardous material
  • Food Grade – has to be manufactured in a clean room environment which is BRC or FDA approved
  • Ventilated FIBC – used for potatoes and other fruits/vegetables for allowing the product to breathe

Different lift loop configurations:

  • One Loop
  • Two Lift Loops
  • 4 Lift Loops

Types of lift loops

  • Standard lift loops
  • Cross corner lift loops

FIBC Bags with Liners

  • Products that are dusting or hazardous will have to have a polypropylene liner inside the FIBC to eliminate sifting of the woven FIBC.
  • Liners can be made from Polypropylene, Polyethylene, Nylon, or a metal (Foil) liner

Electrostatic properties

    • Type – A – no special electrostatic safety features
    • Type – B – Type B bags are not capable of generating propagating brush discharges. The wall of this FIBC exhibits a breakdown voltage of 4 kilovolts or less.
    • Type – C – Conductive FIBC. Constructed from electrically conductive fabric, designed to control electrostatic charges by grounding. A standard fabric used contains conductive threads or tape.
    • Type – D – Anti-static FIBCs, essentially refers to those bags which have anti-static or static dissipative properties without the requirement of grounding.

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