Introduction of Promix PET mixing nozzle
During
the production of PET preforms, the molecule acetaldehyde (AA) is formed as
a by-product of PET. AA can also be found in nature, e.g. in citrus fruits.
The very intense taste can be detected even in very low concentrations,
especially in water. This is why an excessively high AA content in PET
preforms is undesirable. In addition to the recipe, the main influencing
factors for the formation of AA when processing PET are the residence time
and the processing temperature. Since the residence time in the laminar PET
melt flow is uneven, local AA concentrations occur in individual cavities
of the mold. This means that in one injection cycle, within a large number
of high quality preforms, some with too high AA concentration may occur.
This can be counteracted conservatively by using AA blockers. The problem
is that AA blockers also migrate into food and therefore, corresponding
legal limits must be observed. Moreover, AA blockers represent a
considerable additional cost factor.
By using the Promix PET mixing nozzle specially developed for this
application, local AA concentrations are evenly distributed in the melt
flow. This prevents individual outliers. Since the peaks are reduced by an
average of 20 to 30 %, all cavities are then below the permissible AA
limit. If AA blockers are used, their effect is optimised thanks to the
better distribution in the melt. This leads to significant savings in AA
blockers. Not infrequently, it is even possible to eliminate AA blockers
entirely, which permanently lowers production costs.
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Promix PET mixing nozzles also make an
important contribution to the circular economy. On average, new PET bottles
contain at least 30 - 40 % recyclate, and the trend is rising. The Promix
PET mixing nozzle supports a higher recyclate content, as it helps to
better homogenise the lower-viscosity bottle flakes in the melt stream. In
addition, it ensures excellent color distribution in colored preforms. The
Promix PET mixing nozzle was specially designed for the high pressures and
fast injection times in PET preform production. Thanks to its safe and
simple handling, the easily retrofittable mixing solution has been
successfully used by many processors and machine manufacturers.
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Benefits
of Promix PET Mixing Nozzles at a glance:
- Reduction of local AA-concentrations
- Significant savings of AA-blockers
- Excellent color distribution with colored
preforms
- Improved admixing of rPET, favours higher
rPET content
- Homogeneous temperature distribution in the
preform leads to equal wall thickness of the bottle
- Better balancing of the cavities
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Interested? Contact us
today, we are happy to help!
TOSOLtec Co., Ltd. 031-388-6371