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PROBLEM: A milky or hazy line about an inch wide appears periodically across
the width of the web immediately after initial warm-up.
SOLUTION:
The rollers are not evenly heated, and the cold side of the rollers is
preventing the adhesive from melting. When warming up the machine, keep the rollers
open and keep the forward drive on at low speed.
PROBLEM: The machine produces a continuous squealing noise when
laminating.
SOLUTION:
To a certain extent, it is normal for some laminating film to squeal as it is
pulled over the heat shoes under tension. This noise is produced via the same
principles that make a violin squeal. Some of the compounds put on film to keep it from
sticking to itself seem to act like resin on the bow of the violin -- they enhance the noise.
To minimize squealing, run the laminator with the least amount of supply roll tension
that will do the job of removing wrinkles from the web of film. Make sure you are not
using a higher temperature than needed, and clean the heat shoes periodically. If the
noise gets really objectionable, use a different type or different brand of film.
PROBLEM: The laminated material seems to have a pitted or irregular surface
that does not match the texture of the paper being coated.
SOLUTION:
This is usually caused by adhesive build-up or dirt on the rubber rollers,
but it may be caused by any matter stuck to the rollers, such as a piece of paper.
Inspect the rubber rollers; if they are dirty, clean them as indicated in Section 7-3,
Cleaning the Rubber Rollers.
Cuts or other damage to the rubber rollers, especially the laminating rollers, can also
cause irregularities in the surface of the film. The pull rollers are identical to the
laminating rollers and could be substituted if still in good condition.
PROBLEM: The film shrinks as it passed over the heat shoe (known as “necking”
in the laminating trade).
SOLUTION
: Reduce the heat and/or the supply roll tension. The film is not shrinking
so much as it is being stretched by excess heat and tension, causing the web to get
narrower as it is pulled over the shoes.
PROBLEM: No power is getting to the laminator.
SOLUTION
: Make sure there is power at the electrical outlet being used, and make
sure both ends of the power cord are firmly engaged. There are fuses inside the
laminator, but dead outlets and loose power cord connections are the most common
causes of this problem.
Summary of Contents for Premier 4
Page 25: ...25 5 3 FILM THREADING DIAGRAM ...
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