The body of big bags is made from woven polypropylene fabric. It can be distinguished by:
– Fabric weight: From 160g/m2 – 200 m2 or as the requirement from customers.
– Coating: Non coating or with coating 25-30g/m2.
– Colour: White, Beige, or any colors.
– UV protection.
Fabric weight depends mostly on the SWL and SF of the big bag. Customers can always order an upgrade on fabric weight to get an even stronger big bag. Higher fabric weight (GSM) will lead to a smaller belly of the full bulk bag and makes the big bag more resistant against physical damages. Standard cloth weights are 165, 180 and 200g/m2.
FABRIC WEIGHT OF INLET SPOUTS, SKIRTS AND OUTLET SPOUTS
Inlet and discharge spouts and skirts are usually made from lighter cloth of 70g/m2 or alternatively 100g/m2. They are by default coated. The main advantages of using a light cloth is that the cloth is smooth so it is easier to fold, unfold and tie.
Big Bag fabric can be coated or uncoated. The coating is an additional polypropylene layer of 25-30g/m2. This makes the fabric waterproof so no moisture can get through the fabric and leakage of fine materials from the FIBC is prevented. Coated big bags usually also have dustproof sewing to seal the seams of the big bag. An additional advantage of coating is that it “glues” the fabric together so no loose threads can fall of and contaminate the FIBC. The disadvantage of coating is of course slightly higher costs. Sometimes it is required that the bulk bag can breathe a little bit which is also prevented by coating.