Bulk bags are a popular packaging solution for large levels of product such as aggregates and waste. They will have many names which include, Tonne bags, Dumpy bags, FIBC's, Builders bags
The range of sizes and specifications of Bulk bags are vast and each type will suit another use. The specifications can be quite detailed and technical that may sometimes ensure it is difficult to determine what type will be needed for the required use.
When deciding on the right type of FIBC, the next points is highly recommended;
- Physical properties or chemical properties of the intended product to go inside the bulk bag, such as for example:
? Required volume
? Weight of product to be contained
? Bulk density
? Contents flow characteristics
? Degree of aeration
? Particle size and shape
? Fill temperature
? Whether food grade is required
- The filling, handling, transporting, storing and emptying ways of the FIBC.
See below for a complete rundown of terms because of this popular packaging solution and their meaning. This can help to make informed decisions concerning the kind of bag needed.
Terminology Information
Class of IBC = Single trip, standard duty reusable or durable reusable.
Safe working load (SWL) = this is the capacity of the bag and relates to the utmost weight or level of product that the bulk bag can hold safely. It'll usually be shown in kilograms and ranges from 250kg - 2000kg
Size = This will usually be shown in external dimensions and in centimetres.
Safety factor = Standard tonne bags will have a safety factor of 5:1, meaning a 1000kg capacity bag is guaranteed never to break, rip or tear with a weight of significantly less than 5000kg. A safety factor of 6:1, is really a bulk bag made out of thicker woven polypropylene body fabric and tested to a higher standard and is usually a durable or multi trip FIBC.
Filling and discharging features
Plain base - This is a Standard flat base on the bottom of the bulk bag that makes it cuboid in shape. All standard builders bags should come with a plain base.
Lifting loops - Strong loops sewn into each corner of the bag that allows it to be picked up and manoeuvred by way of a fork lift truck. All FIBCs should come with 4 lifting loops.
Filling inlet - There are two types of filling inlets. They're;
Filling spout - A long tube that allows the contents to flow in to the bag easily
Skirt top - Additional fabric at the top of the bag and this can be secured round the filling device to prevent any loss of contents, ensuring that all the contents flow easily into the IBC.
Baffles = Additional internal baffles are sewn onto the corners of the bulk bag. This assists to stabilise the bag and ensure it is more rigid and so are specifically useful for unstable or fluid products.
Discharge spout = A tube made out of woven polypropylene fabric is sewn onto underneath of the majority bag. This provides an easier flow of the contents out the bag when held over a hopper and the contents discharged.
Food grade = Food grade manufacturing pertains to the conditions where the FIBC has been manufactured and stored in before delivery to customer. These conditions derive from strict standards which allow the bag to be ideal for use for foodstuffs. Food grade bulk bags usually come with an internal polythene lamination.
You can find two main types of food grade conditions;
Clean room = The manufacturing/storage facilities are free from loose threads, dirt and dust. Usually more suitable for bird seed and animal feed
BRC compliant food grade bulk bags = manufactured and stored in stringent conditions that meet the BRC standards. This ensures the food grade fibc is suitable to package food ingredients minus the threat of being contaminated.
Liners - An internal polythene liner provides added protection for the contents inside. Liner can either be:
? Inserted loosely or tabbed
? Cuffed, where in fact the liner is inserted and the most notable section roll over the top of the bag to make it more secure.
? Helpful resources , liner is stitched set up at the corners to make sure stability inside the bag.