Pressure Seal - The pressure seal process
uses pressure applied to the mailer in an area where special cohesive
sealant has been applied. The sealant is applied in a specific
pattern and location on both sides of the mailer so that when it is
folded the areas of sealant come in contact with each other.
Pressure is then applied in these areas causing the cohesive sealant
to form a bond. The sealant is applied so that all edges are sealed.
Cohesive Sealant - A
sealant that does not adhere to other materials but when it
comes in contact with itself and pressure is applied, a bond
Cold Glue - Cold glue is applied by a glue folder. The glue folder
applies a glue line on the left and right edges and spot glues across
the top or bottom, whichever is the open edge. It then perforates
the mailer along three edges. When completed, the mailer is sealed
on all edges.
Pressure Sensitive Tape - A strip of pressure sensitive tape could
be used along the closure edge of a mailer to seal it. The PS tape
closure would leave the left and right edges unsealed.
Remoistenable Glue - A remoistenable glue
is applied to the mailer when it is manufactured. Like the cohesive
sealant, it is applied in specific locations on both side of the mailer.
when the mailer runs through the folder/sealer, water is applied to
the glue areas. The mailer is then folded and sealed. The remoistenable
glue is applied so that all edges are sealed.
Note: The preapplied
sealant and remoistenable glue generally have a shelf life.
Your manufacturer can tell you what it would be.
Remoistenable Glue Strip - When the mailer is manufactured, a
strip of glue is applied to one of the edges parallel to the fold
of the mailer. The glue is moistened to seal the mailer once it is
ready to send. This closure would leave the left and right edges unsealed.
The mailer may also have an integrated envelope. An integrated envelope
would be glued at the edges and have a remoistenable glue strip applied
to the flap area.
Note: When using remoistenable
glue, any ink coverage in the glue area should be kept to
50% or less to allow glue to seal properly.