Continuous Multiple Part
There are several options that can be used for
imaging on the continuous mailers. A combination of options can be used on one
mailer to accomplish the necessary imaging quality on each part. Shown below
are the majority of imaging options available and advantages and disadvantages
Carbon paper is a carbon coated tissue that is collated
onto the face of a part that requires an image transfer. It is available
in blue and black, but black is generally used on any type of continuous
form that is going to be imprinted on an impact printer. It is available
in an all over carbon coating or as a pattern carbon coating where
only certain areas are carbon coated and the other areas are blank
tissue. Carbon is generally less expensive to run but many users do
not like it because it is dirtier to work with. Carbon may be an option
selected when hot spot carbonizing cannot be applied to the back of
the preceding part because it requires backprinting in the area where
the carbonizing ink would be applied.
Pattern carbon is generally used between the fly
sheet and the face of the outgoing envelope so that only selected
areas are printed on the envelope.
All over coated carbon may be used to image the
inserts within the outgoing envelope. The mailer can be manufactured
so that the carbons come out with the inserts or so that they stay
in the mailer when the inserts are extracted.
Carbonizing bond is the most widely used form of
selective image transfer for multiple part mailers. The carbonizing
ink is applied on the press. It is applied to the part that precedes
the part that needs to be imaged. The coating can cover almost the
entire back side or it can be applied in just selective areas. It
is also one of the least expensive methods used for selective image
transfer. There are different grades and varieties of carbonizing
ink available. The type you choose will depend on the type of image
you are trying to achieve, from a lighter sharp impression to a heavy
dark impression. The type you select will also depend on how many
parts you are going to be imaging through. Carbonizing bond is a very
good method of image transfer and the carbonized area will hold its
transfer quality for an indefinite period of time.
Although carbonizing bond is a good selection for
image transfer, there are some disadvantages to it. One is that it
has a tendency to smudge from excessive handling. Another is that
it is always active, meaning it does not need any other special coating
that it needs to come in contact with to make an impression. This
may be a problem if the carbonized sheet is used in an environment
outside of the mailer itself. Also, the carbonizing bond is not recyclable.
The hot spot carbonizing would be used on parts
where only selective copy is to be imaged, such as on the back of
the file copy so that only the delivery address was transferred to
the face of the outgoing mailer.
The all over carbonized coating would be used on
the back of the part preceding the insert where all imprinted information
needs to be transferred.
Carbonless paper is paper that is coated with chemicals
that produce an image when they are combined. There is CB - coated
back, CFB - coated front and back, and CF - coated front. See Continuous
Forms - Carbonless Paper for more details on how carbonless
paper works. Carbonless paper is popular because it is clean to use,
you do not have to worry about the smudging carbon coating. When using
carbonless paper, you have to have the proper mate for each part to
transfer an image. CB needs CFB or CF, and CFB needs CF. The CF is
an image receiver only, it cannot transfer an image. Carbonless paper
is more expensive to use but because of its user friendliness, people
are willing to pay extra to use it. The disadvantage of using carbonless
paper for a mailer is that to have selective image transfer, you have
to use desensitizing
to prevent transfer in the areas that you do not want an image to
appear. An alternative is to use carbonless stock on the parts that
have full imaging required and use one of the other imaging methods
on the parts that require selective imaging.
CB carbonless stock could be used as the top part
of the mailer and CF carbonless could be used for the back of the
mailer. When the two are in contact with each other and pressure is
applied by an impact printer, an image occurs on the CF stock.
Another area that carbonless stock could be used
is on a multiple part insert. CB stock would be used on part 1 of
the insert to combine with CF stock used for part 2 of the insert.
Self contained paper is another type of carbonless paper that can
be imaged just by impact. It does not need any other special paper
to make an impression. This paper could be used to get image transfer
when other methods are not available for use. For example, if a special
paper had to be used on the preceding part that was not available
as a carbonless paper and it had a full printed backer that would
eliminate the use of hot spot carbonizing, self contained could be
used because it would be imaged just by the impact of the printer.
One of the biggest disadvantages of self contained paper is that it
does image by impact, so any additional contact has the potential
of marking the paper.
Most manufacturers have the capability of applying
some type of spot carbonless coatings. There are CB, CF and self contained
coatings available to spot coat areas for selective imaging.
CB Spot Coat - A CB spot coat would be applied
to the back of any type of paper. The following part would have to
be a CF paper to receive the image transfer from the CB coating.
CF Spot Coat - A CF spot coat would be applied
to the face of the part that needs to be imaged and the preceding
part would have to be a CB paper for the CF spot coat to be imaged.
Note: The CB spot
coating can be used with the CF spot coating to image a specific
Self Contained Coating - The self contained
coating does not require any other chemical transfer to create an
image. Like the self contained paper, it images upon impact alone.
The use of a self contained patch in the delivery address area allows
the use of a carbonless ribbon to imprint the mailer. This would also
eliminate the need for a blockout on the face of the outgoing mailer.
The disadvantage of the self contained coating is the same as the
self contained paper, it has the potential to be marked up and smudged
by any type of impact.
The carbonless coatings can be used on most any
type of paper which gives you a larger selection of paper to use on
your mailer. It eliminates the need for desensitizing and pattern
carbons. The mailer is less bulky and cleaner to handle because the
use of carbon paper and carbonizing bond is eliminated. The use of
carbonless coatings may not be feasible on shorter runs because of
the additional set up time required but on longer runs it is generally
less expensive than the use of carbonless paper.
Not all manufacturers have the capability
of applying all carbonless coatings so consult with your supplier
before designing these features into your mailer.
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