Re: Bridging In Bulk Bags
One way that might work is to build another hopper over the receiving hopper to set the bags in. Slope the sides of the hopper 55 to 60 degrees to allow for free flow of the product in the bag while allowing the spout to protrude through the opening in the bottom. The hopper only need to be slightly larger than the bag.
Gary Blenkhorn ■
Gary Blenkhorn
President - Bulk Handlng Technology Inc.
Email: garyblenkhorn@gmail.com
Linkedin Profile: http://www.linkedin.com/in/gary-blenkhorn-6286954b
Offering Conveyor Design Services, Conveyor Transfer Design Services and SolidWorks Design Services for equipment layouts.
Bulk Bag Design
Another option is to change the design of the bulk bag. You should be able to get a coated bag with the coating on the inside of the bag to help the slide angle for discharge. Another alternative is to change the dimension of the discharge spout. Maybe make the spout dia. larger. Please feel free to give me a call and we can discuss in more detail. (269) 422-2101
Paul Grams
Sun Coast Packaging, Inc
www.suncoastpkg.com ■
Re: Bridging In Bulk Bags
This sounds like a typical problem. I would recommend a larger diameter discharge chute that is tapered. This lets more of the bottom of the bag to open and by tapering you can control the flow. The other alternative is what we call a funnel bag that is used where you problem exist. Feel free to call 318 387 3260
Pete Anerson
Bulk Pack Inc ■
Re: Bridging In Bulk Bags
As suggested by another response, using a sloped hopper to support the bag bottom will help to break up any hard set of ingredient at the base of the bag, this along with pulsed vibration will further assist in breaking down bridging problems while the bag is being emptied. If the ingredient sets up hard, such as Adipic Acid or Ammonium Persulfate, you may have to 'precondition' the bag by using a bag squeezer to break up the ingredient within the bag prior to trying to empty it. A bag squeezer can be a stand-alone unit or can be incorporated as part of a discharger.
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Bridging In Bulk Bags
Pete Anderson has the simplest design change but if you combine this with the coating on the inside, as pgrams suggests,you achieve the maximum "anti-bridging". This works well for iron oxide that is very difficult to discharge. Feel free to call 208-783-1166 ■
Re: Bridging In Bulk Bags
Materials will compress 28-32% upon proper filling. This bridge will have to be broken for discharge. Focus the bridgebreaking by mechanical means (many choices available, some better than others). Increase the diameter of the outlet spout from standardly 14" to 20 ", and if need be taper the outlet. The combination of both should work well. If the material needs to be fractured then this will require Manual manipulation (hydraulic Press arms) as the bag is lowered into the discharger. Working on the bag spec and equipment selection together is suggested before considering the fracturing. Good Luck. If you wish to discuss this feel free to call. 630-406-9394 (USA) Terry Allen ■
Bridging in bulk bags
We are having a significant problem with bridging in bulk bags ( super sacks ). We use sulfamic acid in 2000 lbs super sacks. The bags are suspended over a hopper and the material allowed to free-flow (can be aided by vacuum). The material bridges badly in the bags. The operator is forced to beat the bag with lengths of pipe and to jam the pipe up the bottom valve of the bag.
Do you know of a method of pre-treating the bag mechanically, in order to break up the bridging? ■