GRA 534 –week 14
December 2, 2013
What will be on the final exam:
exam is at 11:30am
everything will be included, as well as lab material
former fold is the first one folding it in half vertically
then you have your job fold
which gets wrapped around the cylinder half way
the grippers that will take the middle and fold it
then the chopper fold folds it
it’s always getting folded with the grain
and that’s how you get your 16 pager
Can slit the width in the beginning of the former board
Can do gluing or strugine gluing ▯ for finishing
Condensation fold is the most common
Four flexo press configurations
•Common, inline, stack, and sheetfed corrugated
in regards to tensile strength an ideal paper can take a _high__ load and shows__little_
why do plastic substrates need to be either topcoated or surface treated (corona)?
•To improve ink wettability will increase surface tension
what folds are done on a combination folder?
• former fold jaw fold and chopper fold
what print defect will occur if the surface speed of the print cylinder and impression are not the
printing pressure on the flexo press is referred to as
what should be the correlation between ink viscosity and dot gain for flexo inks
•viscosity goes up dot gain goes down
what does the repeat length depend upon?
•Circumference of plate cylinder
What does a converter in the packaging industry do?
•form the printed product into it’s final form
Four main ingredients of a flexo ink
• pigments, resins, additives, solvents
why is it necessary to destroy a fl