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Wrinkles are caused by a variety
of factors
Wrinkling is one of the most common web-handling problems
in the industry today. Yet, there are numerous approaches
to eliminating or minimizing them. That's why we've standardized
a full line of idlers specifically suited to de-wrinkling.
To get the best possible results, discuss your needs and specs
with our Customer Support Specialists.
We'll share over 50+ years of web handling experience to help
you get the right roll the first time.
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Common Solutions to Web Wrinkling
Machine Alignment
One of the most
common causes of web wrinkles is poor machine alignment or bad roll
geometry. When addressing a wrinkle problem, you should first verify
that you rolls are cylindrical and aligned within tolerances appropriate
for your web material. The application of web spreading or wrinkle
removal rolls is not appropriate until roll alignment has been ruled
out.
Reverse Taper Rollers
Also referred
to as concave, reverse crown or bow tie rolls. These idlers are
machined with increasing diameters at the outer edges. This profile
creates a surface speed differential at each different roll diameter.
The resulting tension differential, or higher edge stress, ultimately
results in the material climbing outward toward the larger diameters
at the roll ends. Web Tension and Wrap Angle are critical
to creating the traction needed for reverse taper rolls to be totally
effective. The amount of taper or crown is also dependent upon the
application. Reverse taper rolls are cost effective web spreading
devices and can also be effectively applied anywhere in the line
as general idler rollers.
Web Spreaders
These anti-wrinkle
rolls can influence your web in various ways, including stretching
it, spreading it, or allowing the web to lay flat and simply not
induce wrinkles in the first place. Look over the Web Spreader Idlers.
If you have any doubt regarding your roll specifications, call us.
Also, visit our Web Spreader discussion
in our Technical Center.
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