Product Description
Special **0 German Technology shore pads are available for best
printing onto abrasive substrates and textured finishes. Though the
function of the pad seems simple - to just transfer the image from
the printing plate onto the substrate - it is subject to the same
types of print-quality fluctuations if you don't choose the correct
pad type and use it properly. Five key pad characteristics can
affect the quality of the printed image: 1.shape 2.size 3.hardness
4.surface finish ***** Vary any one of these and the print quality
will shift. You must take these factors into account when you plan
the job and order pads from your suppliers. The shape of the pad
largely determines how well the pad will achieve this rolling
action. This makes shape the most important variable in selecting a
pad. Most pad suppliers have hundreds of pad shapes in their
standard inventory. But most are based on these three basic shapes
* Round * Rectangular * Bar Hardness The hardness of the pad is
normally determined by the amount of silicon oil used when the pad
is molded. The harder the pad, the less silicone oil that was
added. Four basic pad hardnesses are standard in the industry and
cover most applications. Customs pad hardnesses are available. As a
general rule, the harder the pad, the better the performance.
However, a hard pad may be impractical in some applications, such
as when using a low-power machine or printing onto a delicate item.
Choosing the proper pad hardness for a job is a matter of
experimentation and experience. Special **0 Shore pads are
available for printing onto abrasive substrates and textured
finishes. Two such applications include the turn-signal control
arms and windshield-wiper control arms of automobiles, which are
molded in glass-filled nylon. A heavy white ink is required, and
the pad must resist the abrasive nature of the substrate. Special
pads for large images In some situations, a large image area must
be printed and the machine does not have the power to compress such
a heavy pad in a smooth motion. Two solutions to this problem are
available. The first is to use a pad with a hollow interior that
provides the same surface hardness. This technique also reduces the
cost of silicone rubber for such a large pad. The second option is
a dual-hardness pad, where the core of the pad is made of a softer
material and the outer layer is the harder rubber. Both methods can
help, but the second produces a more stable pad. (A third option,
of course, would be to use a different imaging process such as
screen printing for larger image areas.) Quality control of pads
Poor-quality consumables like pads can destroy the performance of
the printing machine. When you receive pads from your supplier, its
vitally important before accepting them to check the pads for:
blemishes on the print surface foreign particles in the print
surface, such as wood splinters "nipples" on the print surface firm
attachment of the pad to the backing plate (The pad should be
secure, with no air bubbles that will cause the rubber to come away
from the base.) hardness within **0 Shore (using your durometer
gauge) positioning on the backing plate (It should be concentric,
with its vertical center line at a *0° angle to the backing.)
height (This is particularly important in multiple-pad
applications). Report any defects to your pad supplier immediately
so that replacement pads can be furnished. Pad Handling Although no
hard and fast guidelines regarding pad life are available, you can
take a number of steps to get the most life from all your pads: Use
a strong solvent only for initial removal of the silicone oil on
the surface. Use a mild solvent such as alcohol, or preferably an
adhesive tape, if the pad must be cleaned during production. Always
use an adhesive tape to remove debris and dried ink before starting
a production run. Don't use too much pad pressure. Ensure that the
substrate is free of debris, particularly sharp particles, before
printing. With wooden-backed pads, don't allow the mounting screws
to penetrate the rubber. When possible, avoid printing near sharp
substrate edges. Use as large a pad as is reasonable for the job.
Never store a pad on top of another. If pads are supplied in a
protective shell, use it when storing the pads in your shop. Handle
and store the pads very carefully.
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Sillicon rubber pads
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