How to Properly Unclog a FIBC

How to Properly Unclog a FIBC

Spout bottom FIBCs are ideal for a wide range of applications due to their flexibility and easily controlled discharge of materials. However, due to their design, spout bottom bags can be prone to clogging.

This clogging, commonly referred to as bridging, occurs as material sticks to itself during discharge and builds up around the bag’s spout. Bridging is especially common in applications involving materials with high moisture content, such as fresh organic products and agricultural goods. To learn more about bridging, read our recent article “What is FIBC Bridging? How Can You Minimize It?” by clicking here.

Bridging can significantly impact the efficiency of your operations by delaying the discharge of materials. Bridging can also present safety hazards to workers, making it important to understand the best ways to unclog a bag. Let’s explore the safest ways to do so.


Tips for Unclogging a Filled FIBC

If you are attempting to unclog a spout bottom bulk bag, DO NOT stand beneath the bag. Doing so can be very dangerous and result in significant injury.

Fortunately, there are many possible methods for unclogging a spout bottom bag without endangering workers, including:

  • Using a broom handle or other type of extension pole to push the spout bottom and attempt to free the materials, staying as far away from the bag as possible when doing so.
  • Massaging the area around the spout with your hands or an extension pole to attempt to loosen the materials. Pay close attention to the discharge spout and avoid getting underneath the bag.
  • Pushing the material through the spout with a broom handle or extension pole while standing above the bag. When attempting this method, be sure to maintain stable footing and keep other workers away from the bottom of the bag.
  • Cutting the bag around the bottom of the spout. This method should be used only as a last resort, as it renders the bag unable to be reused. When attempting this approach, be careful with the blade, and cut as minimally as possible to avoid uncontrolled discharge of the material. If possible, leverage a blade that can used at a distance to minimize risk to the worker.


Whatever method you choose to attempt to clear a clogged discharged spout, National Bulk Bag encourages you to consider all hazards and implement all available safety protocols.


Prevention is the Safest Approach

While it may not be possible to completely prevent bridging, especially when handling materials with high moisture content, there are steps you can take to limit the possibility of a clogged spout.

To prevent bridging, consider:

  • Using an oversized spout bottom bag: A recent innovation to the market, oversized spout bottom FIBCs feature a 28-inch diameter spout. This larger spout’s faster discharge rate and larger opening prevent material from bridging, resulting in increased reliability and safety for users. To learn more, click here to read our recent blog post “What is an Oversized Spout Bottom FIBC?”
  • Using a vented FIBC: When possible, use a bulk bag with vents to dry out the product before discharge. This helps to prevent moisture-filled material from sticking and building up around the discharge spout.



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August 04, 2020

Categories: Bulk Bags

About the Author: Jenny Rosa

Jenny Rosa is an Account Manager for the industrial bag division of Rapid Packaging and National Bulk Bag. She received her Associates Degree from St. Cloud State University and was previously a researcher at JNR Adjustment.

Jenny's background at Rapid includes starting in Customer Service in 2015 and making the transition to sales in 2017. Her background in CS has helped her enjoy finding whole packaging solutions. This includes picking out stock options for short term use, to creating custom solutions unique to individual business and industries.

In her free time Jenny enjoys going to concerts - particularly country, pop and rock. She is a die-hard Minnesota Vikings fan and enjoys canning her own food in the fall (her favorite is homemade spaghetti sauce).

Jenny is National Bulk Bag's resident food-grade specialist. This includes but is not limited to pet food, nuts and legumes, and ready-to-eat foods. She understands in depth the stringent rules facing the food industry as a whole and is an expert at helping food companies find the right bag for their product and application. She also has extensive knowledge of woven polypropylene, BOPP, polyethylene, and textile bags.

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