of heat sealing
Hot bar sealers- have heated
tooling kept at a constant temperature (also known as Direct Contact Thermal
Sealing). They use one or more heated bars, irons, or dies which contact the
material to heat the interface and form a bond. The bars, irons and dies have
various configurations and can be covered with a release layer or utilize
various slick interposer materials (i.e. Teflon films) to prevent sticking to
the hot tooling.
Continuous heat sealers- (also
known as Band type heat sealers) utilize moving belts over heating
Impulse heat sealers- have
heating elements (one or two) of Nichrome placed between a
resilient synthetic rubber and a release surface of film or fabric.
The heating elements are not continuously heated; heat is generated only when
current flows. When the materials are placed in the heat sealer, they are held
in place by pressure. An electric current heats the heating element for a
specified time to create the required temperature. the Jaws hold the material
in place after the heat is stopped, sometimes with cooling water: this allows
the material to fuse before stress can be applied.
Hot melt adhesive can be
applied in strips or beads at the point of joining. It can also be applied to
one of the surfaces during an earlier manufacturing step and reactivated for
Hot wire sealing – involves a
heated wire that both cuts the surfaces and joins them with a molten edge bead.
This is not usually employed when barrier properties are critical.
Induction sealing is a
non-contact type of sealing used for inner seals in bottle caps.
Induction welding heat
sealing by non-contact induction
Ultrasonic welding uses
high-frequency ultrasonic acoustic vibrations to workpieces being held together
under pressure to create a weld.
A type of heat sealer is also used to piece
together plastic side panels for light-weight agricultural buildings
such as greenhouses and sheds. This version is guided along the
floor by four wheels.
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