Finishing FAQ

"COMMON TERMS ABOUT PERFORATING, SCORING AND SLITTING"

About Perforating....

Perforating utilizes a blade consisting of a series of teeth that can be customized for the type of perforation desired. The desired ease with which the detachable portion separates from the main piece will determine the correct type of perforating blade for each job. The tooth formation and number of teeth per inch will also have an effect on the look of the product once the detachable portion is removed.

Examples:

If the material is going to be folded on the perforation and sent through the US mail
, tooth strength of 6 teeth per inch or more is recommended so the tear-off does not come loose during mailing. (#17113)

Multi-part business forms will be designed to pull apart more easily for end user convenience. In this case, snap-out blades of 3 to 4 teeth per inch are ideal for easy separation. (#1716)

If a smooth, cut edge is the desired finished appearance, micro-perforation blades that run up to 45 teeth per inch will provide a clean look once the tear-off is removed. The micro-perforation blade is ideal for laser printed products or laser blanks. (#1700) 

Why Score?

Scoring is necessary on any critical or heavyweight stock when folding is required.
 The scoring process shapes or stretches the paper fibers in preparation for the fold. The process becomes essential on color work and with virtually all heavyweight paper and card stocks.

What is Cut-Scoring?
This process utilizes a score head (#5) to partially cut the sheet allowing for perfect fold with no fiber cracking. This type of score is ideal for high quality greeting card applications. The cut cards lie and pack flat with a cut-score.

Double Head Scoring is a dual shaft process which allows a 'soft' score to be applied on the first pass, followed by a final 'hard' score in the second shaft. This is the desired method for stocks with heavy coatings, UV coatings, digital stocks and brittle fibers to produce a perfect score and fold without cracking. 

Rollem offers the widest selection of precision steel scoring heads for all types of offset and digital products.
For all of your standard or specialty scoring needs, Rollem has a fast, accurate solution. 

Slitting
It is advantageous to trim and slit printed products on rotary systems configured with heavy duty slitting blades housed within top and bottom slitting heads.  Productivity is enhanced with the ability to score, perforating and slit the sheet simultaneously as well as bi-directionally as shown.

In-Line Slitting with digital presses delivers high volumes of Press Sheet to Finished Product in One Pass. Near-Line slitting is common for lower volume press runs of varying products.  Slitting may include press sheet edge slits as well as cuts within the sheet deliver multiple products from a single sheet.

Semi-Slitting
This is also referred to as kiss-cutting or back-slitting and is most often used to slit the backing side of pressure sensitive paper which is used for labels, stickers and automobile decals.  The partial slit leaves the adhesive side sheet in tact.

Bleed-Slitting
The ability to remove small bleeds separating multiple images on a sheet.  Rollem's patented 'in-out' feature ties the sheet together at each end, removes the bleed, and completes the 2nd direction slit to deliver multiple images from a single sheet with bleeds of 1/16" or 1/8".

Common Terms

T-Per Inch
Refers to the amount of teeth per inch on the perforating blade.

Micro-Perforations A perforation designed w ith 28 to 45 t-per inch for ultra smooth perfs with no excess.  Micro perforations are ideal for use in laser printers to maintain the integrity of the sheet. 

T or L Perforations
  Any two directional perforation typically used for creating a single business reply card (L-perf) or two reply cards (T-perf) meant to be removed from the main mailing piece.

Pattern Perforating  The ability to create perpendicular or intersecting perf lines on a sheet to create tear-off coupons, reply cards or tickets.  This is accomplished with Rollem's patented strike-perforation feature.  To create the tear-off item, the perforation is programmed to stop at the desired length.  Multiple perforations are completed with the XY bi-directional capacity of the Rollem Rollaway model.

For more information, or to request perforation and scoring sample sheets or other print finishing concerns, contact Rollem International at (800) 272-4381 or info@rollemusa.com