High density, (0.95-0.965) polyethylene. This part has much higher stiffness, higher temperature resistance and much better water vapour barrier properties than LDPE, although it is considerably hazier.
Heat seal Layer/Sealant
A heat-sealable layer in plastic packaging films and laminates. Can be either adhesive laminated or extrusion coated onto a non-sealable film (or foil). This is also typically the product contact layer and often predominantly made from LLDE.
Heat seal Strength
Strength of heat seal measured after the seal is cooled.
Strength of heat seal measured before the seal is cooled, which is very important for high-speed packaging operations.