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Page 1 of 5
9-layers Co-Ex film blowing line installed in
our application laboratory
This large co-ex film blowing line was recently installed in our new 5,000 sq. meter
factory building next door. Here we have set up a large air conditioned room with
high ceiling to be our application laboratory with the purpose to perform complete
tests for our customer. In the same room we are also building a brand new high
speed 7 layers co-ex chill roll line which will use the extruders from this 9-layers film
blowing line.
Page 2 of 5
The 9-layers co ex film blowing line is
built up with the following machines:
2 units 30 mm extruders and 7 units 25
mm extruders, all with 30 L/D
The extruders are all adjustable in height
so they can be connected to any level of
the high pancake die. They are also
mounted on sturdy platform with casters
so they can be rolled away and be used
for other downstream applications.
All extruders are equipped with
gravimetric hopper feeders which will
allow for a very precise control of each
layer thickness.
The feeders are all
controlled from a
central touch screen
where the feed rate
for each extruder can
be keyed in in gram
per minute or in
percent of the total 9
layers
All 9 extruders are connected to the die with
short straight line die adaptors and the each
extruder is equipped with a screen changer as
well as pressure and melt temperature
transducers which will measure pressure and
temperature both before the screen and at the
die layer inlet.
The extruders can be placed close to the die
thanks to their narrow design and this also allow
for minimum feed pipe lengths from extruder to
die which in turn is very beneficial for certain
resin types that are sensitive to gel formation as
well as degradations.
Page 3 of 5
The die as well as connecting
adaptors shown here are surrounded
by heat protecting steel grids.
The die comprises of 9 individual
layers which are partially insulated
against each other with a small air
gap. Each die layer comprises of two
halves where the flow channels have
been machined equally on both upper
and lower half, enabling that the
channels have a perfect round cross
section which is very important for a
good resin flow without dead corners.
The die has been designed by our
Canadian consultant, John
Peridikoulias of Compuplast. Each
layer was design to be as universal as
possible but still some layers had to
be made for specific resin types such
as EVOH, Nylon, Tie layer etc.
The die is equipped with a high efficiency dual
channel air ring with variable speed blower.
Also the air is cooled with a large chiller. The
air pressure and temperature is shown with
large dial gauges on the air ring.
The film tower is equipped with an oscillating
Nip-Roll which slowly rotates 360 degree back
and forth allowing for very even film rolls. The
film bubble is collapsed in an A-frame with
carbon fiber rollers inside the oscillating nip-
roll. The film bubble is also stabilized with to
sets of bubble cages, each with 6 rows of
Teflon rollers
Page 4 of 5
Downstream the tower is
equipped with a film width
sensor which will automatic
inflate or deflate the film bubble
to a preset film width. The width
is set on a touch screen
controller mounted on the
control panel
Also downstream there is a two sided Corona
treater shown above which will treat the upper
and lower part of the film
The film is split at the edges and then lead through
a pair of Nip-Rolls and further to the 2-station wind
up/
The whole line is controlled on a
central large touch screen panel
where all parameters for all
extruders, die layers tower, wind
up etc are set and read out on
graphic illustrations. All data can
be down and uploaded as well as
manipulated with a tailor made
software.
Page 5 of 5
Technical Data for 9-Layer Blown Film line
Tower Type LF-700 COEX
Total height of film tower (motorized adjustment) mm 5,000-6,000
Haul-off nip-roll width mm 700
Max film lay flat width mm 650
Nip-roll speed (windup speed) m/min 0-35
Pancake die lip diameter (range) mm 120
Die lip opening (others on request) mm 1.5
Height from die to nip-roll for 9 layer die mm 3,200-4,200
Oscillating 360 degree nip roll haul-off, rotating speed rpm 0.134
Two-station surface windup, max winding diameter mm 500
Edge splitting for max film width mm 650
Automatic Film width control system, max film width mm 650
Two sides Corona treatment for max film width mm 650
Extruders
30 mm, 30 L/D Height adjustable version with 11 kW Vector servo drive
2 units for outer and inner
layers
25 mm, 30 L/D Height adjustable version with 5 kW Vector servo drive
7 units for layers 2 to 8
Hopper Weighing system with central touch screen control Mounted on all extruders
Screen changers On all extruders
The 9-layers pancake die is designed for the following resins, but can be used
in many instances also for other resins
Layer No. Primary resin type
1 and 9 (Inner and Outer) LDPE
2 LDPE
3 (Tie Layer) ADMER
4 PA, UBE NYLON 6
5 EVOH type EVAL
6 PA, UBE NYLON 6
7 (Tie Layer) ADMER
8 LDPE
Please check further with us for details of which resins can be used for
respectively layer.