Better Packages offers a
rugged poly bag making machine for creating on-demand poly bags,
the Better Bagger 900e.
Depending upon the needs of the user, the cost of making the
exact number of on-demand, custom poly
static bags with the Better
Bagger 900e can average 50 percent less than the cost of
purchasing minimum quantities of pre-made polyethylene bags.
Static mats
are also another alternative.
Better Packages carries a full line of rolled poly tubing,
including clear, black and pink anti-static styles and new
metallic static shield poly tubing and
esd bags, available exclusively from
Better Packages. When used with the Better Bagger 900e, Better
Packages Poly Tubing can be cut and sealed to create poly bags
from 2 inches up to 8 inches wide and up to 99 inches long for a
multitude of applications and needs. The Better Bagger 900e can
also be customized to enable users to produce custom
polyethylene bags in lengths up to 240 inches. The combination
of the Better Bagger 900e and Better Packages Poly Tubing
results in a system that can produce bags to satisfy over 80
percent of marketplace poly bag requirements.
For more information on the Better Bagger 900e
anti
static bags and the full line
of Better Packages poly tubing products, and to learn about
special pricing on the Better Bagger 900e during the month of
August, visit www.BetterPackages.com.
About Better Packages
Better Packages, founded in 1917 and headquartered in Shelton,
Connecticut, since 1924, is the world’s leading manufacturer of
water-activated tape dispensers used for carton sealing. The
company also offers poly bag making machines, case sealers,
pressure-sensitive tape dispensers, and a full line of dispenser
accessories. Its products are sold and serviced in the United
States and in 20 countries worldwide. Its systems are used
whenever security, strength, efficiency, productivity and a
professional image are needed. For more information, please
visit www.BetterPackages.com.
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COEH Home Page
More About Static Electricity
In electrostatics conditions of charge need not be 'static' and
unchanging. Instead 'static' implies that the dynamic portion is
being ignored, and we analyze frozen snapshots of the situation.
In electrostatics we study e-fields, voltage, and charge but
ignore any currents and magnetism which may also be present.
Because of its relationship and interaction with magnetism, the
two fields are often combined as electromagnetism.
The electrostatic approximation
The validity of the electrostatic approximation rests on the
assumption that the electric field is irrotational: From
Faraday's law, this assumption implies the absence or
near-absence of time-varying magnetic fields:
In other words, electrostatics does not require the absence of
magnetic fields or electric currents. Rather, if magnetic fields
or electric currents do exist, they must not change with time,
or in the worst-case, they must change with time only very
slowly.
Electrostatic potential
Because the electric field is irrotational, it is possible to
express the electric field as the gradient of a scalar function,
called the electrostatic potential (also known as the voltage).
Thus, the electrostatic potential Φ is related to the electric
field E by the equation:
Charge separation by contact
The presence of surface charge imbalance means that the objects
will exhibit attractive or repulsive forces. This surface charge
imbalance, which leads to static electricity, can be generated
by touching two differing surfaces together and then separating
them due to the phenomena of contact electrification and the
triboelectric effect. Rubbing two non-conductive objects
generates a great amount of static electricity. This is not just
the result of friction; two non-conductive surfaces can become
charged by just being placed one on top of the other. Since most
surfaces have a rough texture, it takes longer to achieve
charging through contact than through rubbing. Rubbing objects
together increases amount of adhesive contact between the two
surfaces. Usually insulators, i.e., substances that do not
conduct electricity, are good at both generating, and holding, a
surface charge. Some examples of these substances are rubber,
plastic, glass, and pith. Conductive objects only rarely
generate charge imbalance except, for example, when a metal
surface is impacted by solid or liquid nonconductors. The charge
that is transferred during contact electrification is stored on
the surface of each object. Static electric generators, devices
which produce very high voltage at very low current (such as the
Van de Graaf generator or Wimshurst machine) and used for
classroom physics demonstrations, rely on this effect. Note that
the presence of electric current does not detract from the
electrostatic forces nor from the sparking, from the corona
discharge, or other phenomena. Both phenomena can exist
simultaneously in the same system.
Triboelectric series
The triboelectric effect is a type of contact electrification in
which certain materials become electrically charged when coming
into contact with another, different, material, and are then
separated. The polarity and strength of the charges produced
differ according to the materials, surface roughness,
temperature, strain, and other properties. It is therefore not
very predictable, and only broad generalizations can be made.
Amber, for example, can acquire an electric charge by friction
with a material like wool. This property, first recorded by
Thales of Miletus, suggested the word "electricity", from the
Greek word for amber, ēlektron. Other examples of materials that
can acquire a significant charge when rubbed together include
glass rubbed with silk, and hard rubber rubbed with fur.
Electrostatic generators
The presence of surface charge imbalance means that the objects
will exhibit attractive or repulsive forces. This surface charge
imbalance, which leads to static electricity, can be generated
by touching two differing surfaces together and then separating
them due to the phenomena of contact electrification and the
triboelectric effect. Rubbing two non-conductive objects
generates a great amount of static electricity. This is not just
the result of friction; two non-conductive surfaces can become
charged by just being placed one on top of the other. Since most
surfaces have a rough texture, it takes longer to achieve
charging through contact than through rubbing. Rubbing objects
together increases amount of adhesive contact between the two
surfaces. Usually insulators, e.g., substances that do not
conduct electricity, are good at both generating, and holding, a
surface charge. Some examples of these substances are rubber,
plastic, glass, and pith. Conductive objects only rarely
generate charge imbalance except, for example, when a metal
surface is impacted by solid or liquid nonconductors. The charge
that is transferred during contact electrification is stored on
the surface of each object. Static electric generators, devices
which produce very high voltage at very low current and used for
classroom physics demonstrations, rely on this effect.
Note that the presence of electric current does not detract from
the electrostatic forces nor from the sparking, from the corona
discharge, or other phenomena. Both phenomena can exist
simultaneously in the same system.
Charge neutralisation
Natural electrostatic phenomena are most familiar as an
occasional annoyance in seasons of low humidity, but can be
destructive and harmful in some situations (e.g. electronics
manufacturing.) When working in direct contact with integrated
circuit electronics (especially delicate MOSFETs), or in the
presence of flammable gas, care must be taken to avoid
accumulating and discharging a static charge.
'Static' electricity
Static can be a serious nuisance in the processing of analog
recording media, because it can attract dust to sensitive
materials. In the case of photography, dust accumulating on
lenses and photographic plates degrades the resulting picture.
Dust also permanently damages vinyl records because it can be
embedded into the grooves as the stylus passes over. In both
cases, several approaches exist to combat such dust deposition.
Some brushes, particularly those with carbon fiber bristles, are
advertised as possessing anti-static properties. Also available
are handheld static guns which shoot streams of ions to
discharge static on records and lenses. Static electricity is a
class of phenomena involving objects with a net charge;
typically referring to charged objects with voltages of
sufficient magnitude to produce visible attraction, repulsion,
and sparks.
Natural electrostatic phenomena are most familiar as an
occasional annoyance in seasons of low humidity, but can be
destructive and harmful in some situations (e.g. electronics
manufacturing.) When working in direct contact with integrated
circuit electronics (especially delicate MOSFETs), or in the
presence of flammable gas, care must be taken to avoid
accumulating and discharging a static charge (see electrostatic
discharge).
Note that the presence of electric current does not detract from
the electrostatic forces nor from the sparking, from the corona
discharge, or other phenomena. Both phenomena can exist
simultaneously in the same system.
Static electricity is an important element in the biological
process of pollination by bees, since the charge on a bee's body
helps to hold pollens to it.
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