Choosing a Heat Seal Layer: PE or CPP

The heat seal layer is the part of a laminate that actually closes the pack, so it drives line speed, seal strength and appearance.

PE seal layers

• Seal across a wide temperature window
• Good seal strength and toughness
• Common in general sachet and pouch structures

CPP seal layers

• Lower sealing temperature, useful at high line speed
• Good slip and gloss for printed wrappers
• Widely used in BOPP/VMCPP structures

What to verify

• Seal strength and peel behaviour on your own equipment
• Seal temperature window at production speed
• Whether the seal must peel cleanly or resist opening

Next steps

See Composite Laminated Film and Metallized Barrier Film.