Material :
BOPET
Type :
Transparent
Usage :
Packaging Film
Processing Type :
Casting
Transparency :
Transparent
Feature :
-
Hardness :
-
Brand Name :
-
タイトルまたは説明
BoPET (Biaxially-oriented polyethylene terephthalate) is a
polyester film made from stretched polyethylene terephthalate (PET)
and is used for its high tensile strength, chemical and dimensional
stability, transparency, reflectivity, gas and aroma barrier
properties, and electrical insulation.
The manufacturing process begins with a film of molten polyethylene
terephthalate (PET) being extruded onto a chill roll, which
quenches it into the amorphous state.[3] It is then biaxially
oriented by drawing. The most common way of doing this is the
sequential process, in which the film is first drawn in the machine
direction using heated rollers and subsequently drawn in the
transverse direction, i.e. orthogonally to the direction of travel,
in a heated oven. It is also possible to draw the film in both
directions simultaneously, although the equipment required for this
is somewhat more elaborate. Draw ratios are typically around 3 to 4
in each direction.