First, we start with nomenclature.
Types of specifications or impositions:
Perfect sheet: a sheet in which no assembly position is lost (it can be one-sided or on both sides of the sheet).
IMPORTANT NOTE: for roll to roll machines everything falls into a perfect sheet.
Imperfect sheet: sheet where some assembly position is lost, it can be on one or both sides.
T/R sheet itself: T/R sheet same clamp.
T/R sheet bell: T/R sheet counter-clamp
SLS: single layout per sheet (one assembly or a sheet for each artwork included in the order).
WTS: work and turn system (system that allows the generation of sheet media).
Having said that, we can talk about the leftover:
Surplus base: sheets or meters (flexo) will be added for each assembly of content independent of the number of colors used in the imposition.
%: when the print run is considerably high, this percentage is activated and adds a percentage decrease (the system takes the maximum between the % and the defined base).
U. complex: it is an extra surplus that the system delivers because it considers the work as "complex" (it is added to the base)***.
P. Perfect: surplus delivered by the system when there is a sheet printed on both sides and it is not a half T/R sheet, i.e. when two set-ups are to be considered on that sheet.
Half sheet: leftover to consider when there is half a sheet.
Important note: in roll to roll there is no half sheet.
Then, to finish, this same policy can be applied by color (it is added to the base policy).
In other words, if a job arrives in 4 colors and a value of 100 was entered in P.perfecto, then the system will consider 100*4 = 400 extra leftovers.
*** How does the system know that a job is complex and should add more surplus?
Works in sheets: if the work has "serigraphy", or "stamping" or has more than 3 services on the sheet it automatically falls into the category of being "complex".
Works roll to roll: if the work has a quantity greater than two sheets (hot-stamping) or has UV serigraphy and stamping or foil it is also considered complex.
Do you want to configure a surplus policy per product?
With this, you can manufacture x more units of the required product..