Following successful heat treatment, the packaging systems passes through a cooling
phase , in which the product is brought to a temperature which has no further effect on the
destruction of microorganisms. In selecting the average cooling temperature of the product
it must be ensured, that this is adequately low to prevent any resumption of growth of
thermophilic germs , yet high enough to ensure an adequate post-drying of the package.
Generally , it is recommended not to drop below an average product temperature of 30°C -
35°C .
Since the lug closure consists of tinplate and due to its manufacturing process has an open
cut edge in the area of the closure curl , in the event of residual moisture in this area as
well as in the highly stressed spots on the lugs , there is an implied risk of corrosion . The
latter can bring about rust particles possibly present being sucked into the package when it is
being opened and thus contaminate the product , or cause the formation of rust stains on
the glass thread.
It is therefore essential to adopt suitable drying steps , in order to remove residual process
moisture from the area between the glass container finish and the closure curl. Finished
packages must not be allowed to remain in the autoclave cage for drying. Placing the cages
a slant after the process makes it possible for the water to run off the closures and also reduces
the risk of formation of lime deposits.
The most effective method of removing the residual moisture is with compressed air directed
upwards by an air knife system , blowing simultaneously from both sides into the annular
space between the closure curl and the container finish, vaporising remaining major
collections of water droplets (see Fig 03-8 / Post process moisture removal for finished
packages).
The efficiency of the moisture removal system should be tested on a routine basis,
as follows:
1. Remove consecutive packages exiting the moisture removal system.
2. Dry the package body and exterior of the closure.
3. Grip the container and shake firmly over a dry surface or your free hand, or use compressed
air to blow into the gap between closure and glass.
4. If water droplets are detected, the moisture removal system should be adjusted until
the trapped water in the curl/finish area of the package is eliminated.
In order to support the process of drying by means of the residual heat in the product, it is
advisable to observe a short length of time on the conveyor belts of about 2 minutes before
further processing .
Following successful heat treatment, the packaging systems passes through a cooling
phase , in which the product is brought to a temperature which has no further effect on the
destruction of microorganisms. In selecting the average cooling temperature of the product
it must be ensured, that this is adequately low to prevent any resumption of growth of
thermophilic germs , yet high enough to ensure an adequate post-drying of the package.
Generally , it is recommended not to drop below an average product temperature of 30°C -
35°C .
Since the lug closure consists of tinplate and due to its manufacturing process has an open
cut edge in the area of the closure curl , in the event of residual moisture in this area as
well as in the highly stressed spots on the lugs , there is an implied risk of corrosion . The
latter can bring about rust particles possibly present being sucked into the package when it is
being opened and thus contaminate the product , or cause the formation of rust stains on
the glass thread.
It is therefore essential to adopt suitable drying steps , in order to remove residual process
moisture from the area between the glass container finish and the closure curl. Finished
packages must not be allowed to remain in the autoclave cage for drying. Placing the cages
a slant after the process makes it possible for the water to run off the closures and also reduces
the risk of formation of lime deposits.
The most effective method of removing the residual moisture is with compressed air directed
upwards by an air knife system , blowing simultaneously from both sides into the annular
space between the closure curl and the container finish, vaporising remaining major
collections of water droplets (see Fig 03-8 / Post process moisture removal for finished
packages).
The efficiency of the moisture removal system should be tested on a routine basis,
as follows:
1. Remove consecutive packages exiting the moisture removal system.
2. Dry the package body and exterior of the closure.
3. Grip the container and shake firmly over a dry surface or your free hand, or use compressed
air to blow into the gap between closure and glass.
4. If water droplets are detected, the moisture removal system should be adjusted until
the trapped water in the curl/finish area of the package is eliminated.
In order to support the process of drying by means of the residual heat in the product, it is
advisable to observe a short length of time on the conveyor belts of about 2 minutes before
further processing .
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