Cold seal adhesives are water based natural rubber latex compounds primarily used to seal heat sensitive items such as chocolate bars.
The adhesive is normally applied wet to the substrate by a revolving gravure cylinder, immediately dried in an extended oven before it is reeled up at the end of the press.
The adhesive is usually applied to polypropylene film in a ‘window’ pattern that will allow the wrapper to be sealed adhesive to adhesive on the packaging line, without any heat being applied by the sealing jaws.
COLD SEAL SELECTION CHART
GRADE
APPLICATION
CHARACTERISTICS
SOLIDS
END USE
FP 2035
Corona treated LDPE film
Low tack cold seal with clean non- stringy bonds
53%
Protection of steel components during transit
FP 2154
Wide range of papers and blister pack board without the need of release lacquer
Strong bonds with little stringing when sealed with finger pressure
57%
Heavy duty paper envelopes which can be sealed under low pressure
FP 2162
Laminates where cold seal is applied to corona treated OPP where the release mechanism is homopolymer untreated OPP film
Medium tack cold seal with low stringing of seals
54%
Two ply high gloss laminates for chocolate snacks
FP 2200
Single ply untreated OPP films where cold seal release lacquer present
Provides strong bonds at low coating weights (3gsm)