Ties Per Inch | Perforation
Perforations are classified by bursting strength and type.
The bursting strength is referred to as "ties per inch" or TPI. The
type of perforations are horizontal or vertical, which can be full or partial.
Perforations can be used within the label or on the liner between labels. A
perforation within the label would allow for part of the label to be removed
from the rest of the label. A perforation between labels would allow for one
or more labels, along with the liner, to be detached from a roll of labels or
a continuous stack of labels.
Ties Per Inch
The tie or tab is what is connected to the paper while the
perforation is the cut in the paper. TPI are generally determined by the type
of label and the function of the perforation on that label. Some of the common
ties per inch (TPI) are 6, 8 and 10. The length and number of ties will determine
how easy or difficult the perforation tears. The manufacturer will most generally
use their standard TPI for the type of label being manufactured. If something
special is required, consult your supplier about these requirements.
Limitations on perfs will
be determined by how the label is manufactured. Be sure to
discuss your perforation requirements with your supplier so
he can determine if they are within the manufacturer's capabilities.
Full body shrink labels that extend up over the cover
are generally perforated to form a removable tamper evident band.
Preforms are also perforated to
assist in removal.
Other container labels may be perforated to allow
access to information printed on the back side of the label.
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