Sensitive
adhesive tapes forms a distinct category of adhesive tapes which in dry
form are aggressive and permanently tacky at room temperature. During
production, the adhesive is coated directly onto a release liner or a
carrier. The adhesive is coated in wide width roll form and later sold
in tape roll form to be converted into various widths, shapes and items,
alone or laminated to other materials.
Features
Sensitive-adhesive consists of two major components: a backing and a
pressure-sensitive adhesive. The backing may be paper, cloth, plastic,
film, oil, laminate or other relatively flexible sheet material. The
adhesive is coated on the backing and bonds to the target object as a
result of the application of pressure.
Pressure-sensitive adhesives include a variety of natural and synthetic
materials, including natural rubber, synthetic rubber, block copolymers,
acrylics, silicones etc., modified in various ways through molecular
weight selection, oils, fillers, crosslinking agents, stabilizers,
pigments and other additives.
Sensitive adhesive tapes adhere to a variety of surfaces by the
pressure of a finger or hand. They require no activation by water,
solvent or heat and have sufficient cohesive strength so they can be
handled with the fingers.
Types
They are available in various forms:
- Adhesive transfer tape: a film of pressure
sensitive adhesive coated on silicon treated, release liner.
- Foam tapes: adhesive-coated polyolefin foam
with the adhesive protected by a liner in the form of a tape.
- Film tapes: single or double coated tapes
with acrylic, rubber or silicon adhesives.
Applications
They are used in a variety of industrial and design applications
replacing mechanical fasteners, glues, epoxies, mastics and spot welds.
Applications include mounting, bonding, joining, sealing, shielding,
masking protecting, gasketing, sound damping, cushioning insulating, and
quieting. These tapes are important components in electronics,
computers, automotive, displays, aerospace, furniture, toys, medical,
instrumentation, lighting, metal fabrication etc.
Disadvantages
The disadvantage of pressure sensitive tape is that it causes staining
and irreversible long-term damage. It loses its fluidity, harden and
lose adhesion. Adhesive may become more fluid at higher temperatures and
leach into the paper surface causing translucence.
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