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Perforations

Ties Per Inch | Perforation Types


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. The integrated and affixed products will have different limitations determined by the type of attached product and the type of carrier.

 
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 function of the perforation on the product. Some of the common ties per inch (TPI) are 3, 4, 6, 8, 10, 50 and 72. 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 product being manufactured. If something special is required, consult your supplier about the necessary requirements.


Perforation Types

Affixed Products

The single card itself will not generally have a perforation added to it because the end use of the card does not have a need for a perforation. An affixed label would normally be die cut to allow part of the label to detach from the rest but a perforation could be added if necessary. The carrier, however, of the card or label could have a need for an additional perforation added to it. The guidelines for perforations on the carrier would be according to the type of carrier used. 

For more details on carrier perforations, see the related area for the type of carrier your product will have:
 

For Continuous Carriers, see:
For Unit Set Carriers, see:
For Cut Sheet Carriers, see:

  Continuous - Perforations
  Unit Set - Perforations
  Single Sheets - Perforations
or
  Laser Sheet - Perforations

Integrated Products

Integrated cards are sometimes perfed into the carrier to allow removal of the card. The perf eliminates the need for a patch on the back of the carrier to hold the card onto the carrier. Determining the TPI to use for the perforation will depend on the weight of the stock, the type of stock, how the integrated product will be handled after the card is perfed into the carrier, and preference as to what type of edge the card will have when detached from the carrier.

Enlarge View of Card Edges

A 3 TPI perf would produce a card with just a few ties on the edges when perfed out of the carrier.

Using a micro perf (50 or 72 TPI) would produce a card with a very fine perforation, giving the card's edge a smooth appearance.

Integrated labels are generally die cut into the carrier to allow for easy removal from the liner patch, see Die Cutting. The carrier of the integrated card or label could have a need for an additional perforation added to it even if the card or label does not have a perforation. The guidelines for perforations on the carrier would be according to the type of carrier used. 

For more details on carrier perforations, see the related area for the type of carrier your product will have:
 

For Continuous Carriers, see:
For Unit Set Carriers, see:
For Cut Sheet Carriers, see:

  Continuous - Perforations
  Unit Set - Perforations
  Single Sheets - Perforations
or
  Laser Sheet - Perforations

 

 Be sure to discuss your perforation requirements with your supplier so he can determine if they are within the manufacturer's capabilities.

 


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