When it comes to choosing the perfect heat sealer for your industry’s needs, you
can easily be overwhelmed with various model features and the different
heat-sealing technologies. Choosing a
sealer depends on how you are going to use it, what materials you need to seal,
and how often are you going to use it.
Ask yourself these
questions, do you want speed? Or do you want economical and safe features?
Two of the most common heat-sealing technologies are the
constant heat sealers and the impulse heat sealers. These are often compared to
one another and leave prospective heat-sealer buyers wanting more details about
how each technology works.
Constant heat sealers have seal blades that can be of
various shapes, which allows the seals to be of various shapes. The seal blades
are constantly kept at high temperatures to fuse the object into the perfect
seal. Constant heat sealers are known for faster seals because they do not
require a cooling period, but that means you may not receive as clean of a
sealing finish as our impulse sealers.
Impulse heat sealers fuse the film by conducting electricity
on impulse through a heater ribbon, which dictates the seal to be a straight
line. Impulse heat sealers require a cooling period, which makes the sealing
process take longer than our constant heat sealers. There are some methods
available to overcome a longer sealing time, such as air-cooling and
water-cooling, which are forced cooling methods.
In addition to the constant heat sealer and the impulse heat
sealer, there are two other heat-sealing technologies that are offered:
ultrasonic sealers and high-frequency sealers. These four different
heat-sealing technologies provide properties that may be essential to your
industry, such as seal temperature control, risk of burns, energy consumption,
seal finish precision and the amount of time the seal process needs. To break
all this information down about the different types of heat-sealers, we are
going to explain the features found in each type of sealer so you can make an
informed decision.
Impulse Sealer
Impulse sealers get their name from sending a high current
on impulse (or instantaneously) to a heater ribbon, that is located on the
heat-sealing blade, to generate heat that enables the thermal sealing. The section to be sealed is placed between
the heat-sealing blades; pressure is applied, and is thermal-fused when the
heat is delivered on impulse through the heater ribbon. Once the current stops, a cooling period with
maintained pressure is necessary.
Constant Heat Sealer
Constant heat-sealers have a built-in heating element inside
the blade to generate heat. Heat-sealing occurs by generating heat and
controlling temperature at the seal blade. These types of sealers can seal many
shapes, such as the cup seal.
One pro of the constant heat sealer is the fast sealing
speed, due to the face that it does not require a cooling period. A con of this sealer is that, unless you use
an automated machine, you need to be a skilled operator to handle the
hand-or-foot operated machine as the pressure application and foot application
time dictates the seal integrity. Even though a lot of our sealers are known
for their “no waiting” heat sealing, this sealer does require some time to warm
up before you can seal.
Ultrasonic Sealer
An ultrasonic sealer converts ultrasonic energy of 20Khz
frequency energy or higher into a mechanical frequency energy, then the
frequency waves travel from the resonator horn to the section to be fused, and
generates strong friction heat to seal the object. Unlike high-frequency sealers, this sealer
can thermal-heat almost anything such as film and nonwoven materials as long as
they are thermoplastic. If you are interested in this type of sealer, we offer
this model under the US-60B category.
High-frequency Sealer
High-frequency sealers apply high-frequency voltage to the
electrodes as the packaging material is being pressed. The high-frequency
dielectric heating generates heat from within the packaging material, causing
it to seal. The constant frequency and the potential for high-frequency power
allow the heat value to get higher as the dielectric loss factor increases.
This type of sealer can only be used with resins that have high dielectric loss
factors, such as vinyl chloride, vinylidene chloride and nylon.
In order to find a heat-sealer that will benefit your
industry, remember to always keep in mind your industry’s need while exploring
the four different heat-sealing technologies.
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