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276
FOOD PACKAGING TECHNOLOGY
Heat fix tapes are based on kraft paper where the adhesive is applied as
a thermoplastic emulsion which is subsequently reactivated by heat and applied
to the sealing surface by pressure. Sealing tapes are used plain, preprinted or
printed at the point of application.
8.8.14
Cushioning materials
Paper based cushioning comprises:
• Shredded paper used as a loose fill packing – this is a good use for clean
recovered paper – not widely used in food packaging
• Interlocking dividers used to separate, for example, bottles in a case
• Corrugated fitments made up of one or several layers of corrugated
fibreboard cut to special profiles to support, locate and protect vulnerable
profiles of items. Not specifically used in food packaging but widely used
in products associated with the cooking and storage of food
• Moulded pulp applications (already mentioned under Section 8.8.11
above for eggs and apples).
8.8.15
Cap liners (wads) and diaphragms
There are a number of ways of ensuring a good seal when a lid is applied to
a jar, bottle or similar rigid container.
• Pulpboard disk. The simplest type of cap liner is a pulpboard disk made
from mechanical pulp fitted inside a plastic cap. This cap liner or wad
has to be compressible and inert with respect to the contents of the
container. This liner could be faced with aluminium foil or PE where the
nature of the contents require separation from direct contact with the
pulpboard.
• Induction sealed disk. The disk comprises pulpboard/wax/alumium foil/
heat seal coating or lacquer. The cap with the disk in place is applied to
the container and secured. It then passes under an induction heating coil.
This heats the aluminium foil which causes the wax to melt and become
absorbed in the pulpboard. It also activates the heat seal coating and
seals the aluminium foil to the perimeter of the container. When the
consumer removes the cap the adhesion between the pulpboard and the
aluminium foil breaks leaving the foil attached to the container. This
seal therefore provides product protection and tamper evidence. Where
subsequent contact between the contents and the pulpboard is undesirable, the pulpboard is permanently bonded to the aluminium foil. (A simpler version dispenses with the wax and replaces the pulpboard with
paper.)