Answer:
Knockout or void areas are places that should not be printed with ink or varnish. These are areas that will receive glue or gum adhesives during the envelope converting process. In order to fold and glue any envelope and get the seams to hold and flaps to stick, envelope glues must be free of ink and varnish in order to properly adhere to paper. The knockouts are used when heavy inside ink coverage (tints) or heavy outside ink coverage bleeds to the edge of the envelope.
BLEED INSTRUCTIONS
- Whenever bleed exists (i.e. top, bottom, sides) a minimum
bleed of 1/8" is required up to and including #10 size;
for sizes #11 and up add 1/4" bleed! These specifications
will allow for cutting and folding variations.
- VOID AREAS or "knockouts" must be made for all gum areas! Envelope gums cannot penetrate ink coverage. Therefore, void areas allow gum to grab paper fibers and seal properly.
Answer:
The side and tail register mark is the envelope die cutter’s check system that insures a cutting lift is jogged and clamped in proper registration. It’s the last check that the cutter looks for before the die is placed for cutting. If the 200-sheet stack has that straight line running down the lift, it tells the cutter all is in proper registration and to proceed.
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