Recently we were asked to evaluate a consumer product that was flow wrapped for overwrap. We carefully undid the wrapping, so that we could see how much material was being used to flow wrap. We laid that film out flat against what we cut to do the overwrap; then we measured the difference.  The difference in square inches was 14% less for the overwrap. That means a 14% film savings over the life of the machine.

We then went on to look at the case pack. Because the excess film took up so much space in the box, there was an extra inch along one side of the box. We cannot do the calculation of what that might mean over a pallet load but we believe that one inch might be huge when looked at over a truck load, or many truck loads. We see sustainability written all over it.

Flow wrapping is a great choice for airtight sealing. You can use clear or printed film and have a total barrier seal. Some candy companies have switched to flow wrapping their candy bars because the candy lasts longer in vending machines.

So what is flow wrapping? Think of a tight fitting bag that your product is slide into and sealed. That is not quite how it happens but that is the net effect. The product ends up with tails and flap of long seam on the back/bottom. For larger products, there is also a tucking action that makes the flow wrap conform better to the product, like a gusseted bag.

Overwrap, like a neatly wrapped gift, is not as complete a barrier wrap, since it uses a tuck and fold to more tightly hug the product with sealing centered on the bottom seam and the tuck and fold, but it commonly considered to be a more attractive wrap.

Flow wrap and overwrap both use polypropylene film (BOPP) to create the wrap. Both can use printed film. Overwrap offers the versatility of wrapping with other materials such as paper, waxed paper or cellophane.

We cannot be sure that every package would show this difference in film consumption, but we now know that there are opportunities for material savings between flow wrap and overwrap.