Utilizador:Antonio Cruz/Rascunhos: diferenças entre revisões
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Linha 34:
and body diameters and shoulder radius. The heel design
of containers can also improve strength.
== algumas propriedades ==
Composition
. Composition
. Density
. Softening point
Strength
. Compressive
. Stacking strength
. Hydraulic pressure strength
. Impact strength
Thermal shock
Visual/optical
. General visual quality
. Clarity
. Color
Dimensions
. Container weight
. Wall thickness
. Finish dimensions
. General dimensions
Permeability
Thermal shock is a measure of glass’ tendency to crack
under heat. This is important for hot fill, retorting, and
applications in which the product is heated in glass by the
consumer to be served. Finite-element analysis is used to
model this.
Glass is often used for its superior optical properties.
Thus, measurement of these properties is important. On
glass production lines, automated inspection stations are
used to verify that the containers are free of sand, dirt,
stones, and other visual defects. Clarity and color, and the
consistency of both, are important in glass manufacture
and use. When printed or when graphics are formed into
the glass surface, the appearance of these aesthetics also
needs to be measured.
The containment capability of a glass container is
dependent not only on the properties of the particular
glass formula but also on the thickness of the container
walls. Additionally, the total weight of each container
must be measured and controlled to assure consistency
of cost, performance, and fill weights. The finish dimensions
must be consistent to assure that the cap/closure
system fits properly, offers correct opening strength, and
provides an appropriate seal of the package.
Glass offers excellent water vapor and gas-barrier properties.
When pigmented, it provides light control as well.
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