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Punching |
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| (1) |
PMC or Busch type punching machines are optimal
for YUPO®, but other types can also be used (for
example, direct pressure, drum pressure and rotary
types). |
| (2) |
One-sided or two-sided blades can be used, but
blades must be sharp and free of nicks. If the
blades are not sharp, the edge will be prone to
napping, and removing the nap may cause delamination. |
| (3) |
Right angles and sharp corners may cause tearing,
so be sure to design the material with rounded
corners before punching it.
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| (4) |
When using machines other than PMC- or Busch-type machines, set the blade that comes into contact with the back plate so that it touches it lightly to prevent damage to the blade. Also, adequately remove any unevenness. If the blades get crushed or nicked, this may cause a nap to appear on YUPO® or delamination. |
| (5) |
Set the interface of the punching die to a position
that follows the grain of YUPO®, and narrow it
as much as possible to improve the workability
of removing napping. |
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Drilling |
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| (1) |
Use a drill with a diameter of 6 mm or more, and ensure that it is sharp and free of nicks. If the drill diameter is too small, the sheets can bend. If the drill is not sharp, after marks may fuse to damage the drill blade. |
| (2) |
Expel the air from between the sheets prior
to drilling. |
| (3) |
The height of the paper to be drilled at one
time should not exceed 20 mm. |
| (4) |
If the openings become fused, allow the drill
to cool or replace it with a new one. |
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Perforating |
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| (1) |
Use machine blades that are sharp and free of
nicks. |
| (2) |
Create perforations that are accurately in a straight line.
| Good examples |
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| Bad examples |
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| (3) |
Set the perforation blades up as follows.
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Uncut |
Cut |
| Along the grain of YUPO |
0.8-1.0mm |
2-3mm |
| Across the grain |
Maximum of 0.5 mm |
2-3mm |
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| (4) |
If the perforations touch the edge, the paper
will be prone to tearing. |
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