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| If the ultimate in barrier
properties is required, an
aluminum foil laminate tube
may be the most desirable.
Aluminum is the traditional
barrier layer of choice for
highly aromatic materials, as
well as for those whose flavor
or other properties could be
degraded by exposure to air
or moisture vapor.
Aluminum is suitable for
most applications, except
those requiring spring-back
or transparency.
A typical construction for
such an application would be
white PE-film outer layer,
PE-tie layer, aluminum foil
barrier layer, PE-tie layer, and
PE-film inner layer. The
thickness of the aluminum
foil barrier layer can be
varied to accommodate the
special requirements of the
contents. |
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This new structure made from
a ceramic/PET base provides
oxygen and moisture vapor
barrier properties nearly equal
to those of aluminum, and
significantly better than
EVOH, as shown in the
following chart.
A typical construction for an
opaque tube would be white
PE-film outer layer, PE-tie
layer, opaque CERAMIS
barrier layer, PE-tie layer,
and PE-film inner layer. A
typical construction for a
clear tube would be clear
PE-film outer layer, clear
copolymer tie layer, clear
CERAMIS barrier layer, clear
copolymer tie layer, and clear
PE inner layer.
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| The all-plastics EVOH
laminate tube has become a
desirable option for many
personal care products.
A typical construction for
such an application would be
white PE-film outer layer, PEtie
layer, EVOH barrier layer,
PE-tie layer, and PE-film
inner layer.
Because the outer layer of the
laminate is white PE-film, it
can be surface printed with
brilliant colors and graphics
by dry offset or flexographic
methods. |
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For further information
regarding barrier properties,
this chart reflects the results
of analysis of available
materials. Tests have shown
that CERAMIS tubes not only
have good oxygen and
moisture vapor barrier
properties but also work well
as an aroma barrier. They are
very elastic and available in
both opaque and transparent
versions. This chart indicates
the water and oxygen
permeation. |
