Feed systems heat sealing

There are a number of well-established systems for the aseptic packaging of liquids. Notable among these are those packs constructed, box form, in situ on the filling line from a cardboard, aluminium, plastic laminate sheet, such as TetraPak or Combi-box. In the TetraPak system, the packing material enters the filling machine from a feed roll the sheet contact surface is sterilised with warm hydrogen peroxide solution it is formed into a tube, and its lower end is heat-sealed across the width the tube is filled, sealed at the upper end, cut and then folded into a box shape. This produces a continuous output of filled cartons with premium utilisation of bulk storage capacity. 

Strip packaging machines are far simpler and smaller than blister packaging units, usually simply consisting of a feed system, product insertion plus heat sealing, and a guillotining operation to size. 

During the winter of 1991, bulk mustard was drained from pre-heated (20 C) 1-ton containers into heavy-walled, polyethylene-lined cardboard boxes and allowed to freeze under cool conditions (< 0°C). The boxes containing frozen mustard were then placed in sealed metal cargo containers and immediately transported to the incinerator site. The boxes were then off-loaded and processed via the rotary kiln solids feed system. All bulk mustard (3 toimes) was destroyed in this manner as part of the incinerator test bum program (see below). 

In these tests, usual carbon steel was wittingly used, as the aim was to test combustion of pyrolysis oil in a common fossil oil burner system. The pipeline and the heat exchanger of pyrolysis oil feed were of St 37.4 DIN 2391 precision steel pipe (size 10 X 1), so-called Ermeto-pipe. The pipeline clearly corroded during the tests, vririch was also seen in an increase in the iron content of oil. It is self-evident that the durability of materials, both steel and seals, has to be ensured in the design of a special pyrolysis oil burner and fuel line to it. 

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