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Manuale Lyra 600 sx elettr eng
19 Packaging problems and solutions
The film tends to move to one side of the forming box
The film roll is not centered in respect to the center of the center axis of the machine, move
the roll towards the side where there is less film, by turning the knurled ring that adjusts
the film roll centering.
The film tends to come out from both sides of the forming box
Make sure the film tension is correct and constant, the entry angle is to be smooth and
without folds.
Make sure the fin wheels pull the film smoothly, the first set fin wheels must pull efficiently
without slipping.
The heated set of fin wheels must have the correct temperature, excessive temperature will
cause the film to burn and consequently it will come out of the fin wheels.
Make sure the film roll brake has the correct tensioning, excessive or too little tension can
cause the film to come out from in between the fin seal wheels.
The film width is to be according to the product circumference and the fin seal quantity. (2 x
product width + 2 x product height, approximately 40 mm. fin seal).
The film tends to brake in the forming box area
If the film tends to brake, the tension may be too much and it will therefore be necessary to
adjust the tension by loosening the two bronze knurled rings placed on the brake assembly.
If the film tends to brake before the forming box then it means the calander rollers that
guide the film towards the adjustable forming or the last roller are not in the correct
position. To correct this move the arm forwards and backwards (loosen the blocking
handle), or move the last roller forwards/backwards/loosen the knurled blocking rings. The
film must have no folds on the last roller and the flow of the film from the last roller to the
beginning of the forming box wing must be smooth.
The film tends to pile up against the sealing jaws
If the speed of the jaws is not equal to the speed of the film: Adjust the slowdown assembly
unit by turning the clock placed on the right hand side of the machine. The jaw must be
adjusted so that it turns at approximately the same speed of the film.
The longitudinal seal is not good
Make sure the fin seal grooves are clean and match one in each other.
If the seals tend to open make sure the fin wheel temperature is correct, if the above is not
the problem it may be that more fin wheel pressure is required, this is achieved by acting
on the bolt and counter nut positioned on the external side of the guard. If the seal tends to
fold over proceed as follows:
1) Lower the pressure in the fin-seal wheels (close to the sealing jaw) as described in
Chapter 7.
2) Check that the film does not slip between the wheels of the first group (towards the
infeed conveyor) and put the two wheels closer as described in Chapter 7, if necessary.
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