Mitre Seal bags & K-Seal bags

Inside the base at the bottom of a normal gussetted box liner, you find four pockets that form naturally.  When we manufacture the liners we apply an additional 45 degree seal on each of the four gusset panels to close the pockets.  These bags are also sometimes referred to as Cross corner seal bags.

When used in combination with grains or powders, without the mitre seal, these pockets can create product entrapment and therefore loss of product.  Thats why Mitre Seal bags and K-seal bags are very popular in the food processing industry.  Mitre seal bags and liners are not only designed to eliminate food waste or loss of product in the un-packing process, but the additional seals actually strengthen the bottom of the bag too.   Some box liners are required to be lifted out of the box, with the contents still inside, sometimes 20-25kg in weight.  On a normal gussetted box liner without mitre seals, the stress points on the seal become holes and create leakage whereas the mitre seal bags prevent this, again resulting in less loss of product.


Polycover K-Seal Bag

Here is an image of a bag without Mitre Seal or K-Seal.  The stress point has burst:

Other uses for the mitre seal and k seal is in cross corner seal box covers.  This is where the same seal is applied to U-fold sheets to create cross corner seal tray liners or dolav covers. We can also produce dolav liners.  Have a look at our mitre seal covers and mitre seal dolav liners leaflets.

If you would like to know more about these types of product, please get in touch and we will happily assist or provide samples.  Alternatively, you may want to read about our Food Grade Polythene Bags