Postpress consists of supplementary
operations to printing: binding, finishing, and distribution:
Binding: work required to convert
printed sheets into books, magazines, catalogs, and folders
Finishing: operations to make
displays, folding cartons and boxes, tags, labels, greeting cards, special
packaging and advertising materials
Distribution: processes, facilities,
and means used to handle, package, and ship printed products to the customer
Binding processes:
Pamphlet Binding: folders, booklets, magazines, catalogs
Scoring: crease in a sheet of heavyweight paper to
facilitate folding, those that produce an embossed ridge on the paper
will give good folding results. The fold should be made with the hinge
or ridge on the inside for minimum stretch
Folding: paper is folded on a buckle, rollers force
the sheet into an adjustable fold-plate, sheet hits a stop at the fold-plate,
buckles, and is carried between rollers which fold the sheet. Parallel
and right angle folds.
Gathering/Collating: single
sheets are collated, folded sheets are gathered
Stitching: after signatures are collated, they can be saddle
stitched. Book is placed on a saddle beneath stitching head and staples are
forced through the spine. Simplest and cheapest form of stitching. Booklets
will like flat. Most booklets, programs, and catalogs are saddle stitched.
Cutting: Guillotine
cutters have a single knife and are used to cut labels, paper…
Trimming: usually
done with 3 knives in a single cycle
Bookbinding: binding a book; edition binding, perfect
binding, mechanical binding
Edition
Binding: (hardcover) 2 methods to bind bookblocks together
Sewing: individual signatures are sewn through the fold into
a bookblock and then receive an adhesive coating on the backbone. Open flat
and offer best durability.
Adhesive: One
or Two Shot Burst, Notch, Threadseal binding adhesives
Perfect Binding: (softcover) sheets are held together
by flexible adhesive, one or two shot Polyurethane
Mechanical Binding: (manuals and notebooks) Books which
must open flat. Sheets are punched with a series of holes on binding
edge, then wire, plastic coils, or rings are inserted.
Finishing
Embossing: The image is molded in embossing so it is
raised in relief. Process is to press the material between a brass female
die and a male bed
Diecutting: 2 methods:
High or Hollow
Diecutting: (labels
and envelopes) Hollow like a cookie-cutter positioned on a pile of paper
and pressure forces the die through the sheets.
Steel-rule Diecutting: (larger
sized dies and close register) steel rules bent to desired shape placed
in jigsawed gaps in plywood dieboards. The multiple dies are locked into
a chase. They are positioned and made ready on a platen diecutting press.
Shrink-packaging: used to wrap printed pieces. Product
is inserted into a roll of polyethylene film which is heat-sealed around
the product. Then the shrink tunnel shrinks the film tightly around the
product.
Distribution: mailing and distribution are important functions
of postpress process. The distribution process is currently expensive and
inadequate.
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