Is lamination necessary for polywoven dunnage air bags?

Historical Background
The lamination process is a carry-over from the FIBCs and big bags which came into being in the 1960s.These bags were used to hold flowable materials like food grains, plastic resins, animal food pellets and powder like cement .The lamination helps to prevent the contents from leaking out and dirt & mosture from seeping in. In the process, a plastic film (PP or PE)of thickness from 0.02 – 0.06mm is laminated onto the surface ( inner, outer or both) of the bag using heat.

What does the lamination do to the dunnage bag?
It does not contribute anything to enhance the performance of the dunnage bag. On the contrary , it adds about 3-5% to the cost of the bag.
Some quarters claim that with lamination the polywoven dunnage bag is stiffer and therefore easier to hold in place during inflation .We have always recommended that the uninflated bag (both polywoven and paper types) be ‘sandwiched” between two pieces of cardboard ( used or new) before inflation . This will make it easier to hold the bag in place during inflation and also prevent the inflated bag from being punctured by any sharp edge or point from the pallet or cargo load.

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