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FIBC Bottom Construction

Types of Bottom Discharges

  • Full Bottom Discharge
  • Flat Bottom
  • B - Lock Bottom
  • Conical Bottom
The discharge outlets that extend from the bottom seam of the bag and follow the bag’s base dimensions. A full open discharge is when the entire bottom of the bag opens up and releases all of the contents at once. These bags are commonly used when accuracy of discharge does not matter
Flat bottom bulk bags offer a simple piece of fabric as the bottom of the bag made of the same woven polypropylene material. This is the only bottom construction type that offers no discharge
A b-lock bottom, also known as a cord lock, is normally used for safe closing of the FIBC skirt, top spout, and/or bottom spout. It is often used as a closure device to hold the rope or cord in place on the spout. They come in a variety of sizes and eliminate the need for hand tied knots.
The FIBC bottom is shaped like a cone. Bags with conical bottoms are especially suitable to pack tacky that do not flow freely like clay, slurries, etc. The Conical design provides a gradient for the tacky materials to ‘flow’ towards the outlet spout.

Types of Discharge Spouts

Discharge Spout

It is a spout at the bottom of the bulk bag that remains closed until the material is ready to. The discharge is controlled, direct, and does not destroy the bag while the product is being discharged. Discharge spouts come in multiple sizes and can be customized.

Discharge Spout with Flap

A discharge spout with flap, also known as a sanitary flap, is a diaper that protects the entire bottom surface of the bag. It is designed for cleanliness and to prevent wear and tear. It is also referred to as a protective bottom.

Discharge Spout With Safety Valve (Iris Closure)

The discharge spout equipped with a safety valve is ideally suited for throttling the spout to control the flow of material being discharged from the bag. They are commonly used to control the flow of material and/or there are hazardous materials being discharged from the bag.

Discharge Spout With Cover (Star Closure & Petal Cover)

A piece of fabric sewn between the spout and the petal closure is used to hold in/protect the spout. It is designed to prevent bulging and minimize contamination risk. This square piece of fabric is branded with an ”X” and has webbing sewn in each flap for closing the opening in the bag. It is sewn over the discharge spout for protection.

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