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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.

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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.

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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

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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.

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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.