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| Sizing
Cage Installation Guidelines |
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Overview: Installing the
sizing cage properly is essential to overall flexibility of
the blown film line. More specifically, layflat control and
production rate are directly affected when the cage is not
installed properly.
To get the most performance from
the sizing cage, you want to make the best use of the available
vertical travel of the cage. Most cages come with about one
meter (~40 inches) of vertical travel. Optionally, up to two
meters (~80 inches) of vertical travel can be provided.
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Vertical
Position: To help decide the proper mounting position
for the vertical support of the cage, consideration of the
lowest typical frost line position is required. For optimum
IBC performance, cage should be able to be lowered so the
IBC sensors are about 75mm (3 inches) below the lowest typical
frost line. At the same time, the cage position should raise
to the highest typical frost line position. Click here
or on the picture to see an enlarged view. Make sure the
X-Y alignment bolts are in the center of the adjustment position
before welding or bolting the cage to the tower.
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Cage Alignment: Before
aligning the cage, the die and primary nips need to be leveled
and centered. Then align the cage to a plumb bob that hangs
from the primary nips. Start by aligning the main frame using
the X-Y adjustment bolts. Afterward, open the cage diameter
to the maximum size and make sure all cage arms are equidistant
from the outer frame. Most cages have individual arm adjustments.
The final step is to run the line and verify the cage is centered
around the bubble. Verify the film thickness profile is within
specifications and there is no bulge in the bubble before
moving the cage.
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