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Substrate Design Technology
In adhesive tapes, the film onto which the adhesive
is applied is referred to as the "substrate" or
the "backing".
The substrate plays an important role
in realizing the functions required in an adhesive
tape, as well as enhancing its strength. Therefore,
there are many different kinds and substrate design
technology plays an important role in the overall
development of adhesive tape.
In packaging applications, adhesive
is used, for example, with paper as a substrate
when the ability to rip the tape by hand is a priority,
while in electrical applications where the emphasis
is on insulation and transparency, polyester film
is used. Polyimide is used when heat resistance
is required, such as in solder masking, and polytetrafluoroethylene
(PTFE) film is used when abrasion-resistance and
smoothness are required for heat-sealing applications.
In surface protection films where flexibility is
a major requirement, polyolefin film is used. As
metal foil is conductive it is suitable for use
in connecting various items and foam is used for
sealing mobile phones.
Polyolefin film where undulations have
been formed on the surface is an example of a substrate
that is not only strong, but that can also be ripped
by hand, making it suitable for construction applications.
Surface protection film used to protect
metal sheets during the deep-draw molding of items
such as sink benches and to make them slippery
is an example of substrate design that utilizes
the properties of this film.
Dicing tape for silicon wafers is an
example of substrate design that in this case utilizes
the stretching property of plastic film. After
dicing, although the dicing tape used to secure
the chip during pickup is stretched it is designed
to be able to withstand this pressure.
A special polyolefin film is used in
protective films for automobile coatings, which
must follow the contours of the vehicle and be
able to withstand exposure to sunlight.
In recent years, the use of transparent
plastic film as a protective film for the displays
of mobile phones and LCD TVs has become widespread.
At Nitto Denko, we use substrate design
technology to realize a wide range of functions
that can then be utilized in our adhesive tapes.
Main Substrate Currently in Use
| Paper | Craft paper, Japanese paper, crepe paper |
|---|---|
| Cloth | Rayon (staple fiber) cloth, cotton cloth, acetate cloth, PE/PP blend |
| Film | Cellophane, PVC, PE, OPP, PET, PTFE, PI, PC, PS |
| Foam | Polyurethane, PE, butyl rubber |
| Metal foil | Aluminum, copper |
| Rubber sheet | Natural rubber, SBR, butyl rubber |
Examples of Adhesive Tapes that Utilize the Shape and Properties of the Substrate
Surface protection film that can used in deep-draw molding
Stretchable plastic film
Polyolefin is used in automotive applications where high levels of weather-resistance are required
Transparent plastic films
Protecting LCD panels with adhesive transparent plastic films
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