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Blow Molded Plastics Terms
– The lack of haze or cloudiness in a
plastic material.
– A material that at room temperature has the ability
to return to its original shape after being stretched up to twice its
length.
– A high-barrier plastic
resin packaging material.
– Also known as the “E” dimension, it is the
material enclosing the neck opening of containers that accommodate particular
closures.
– Extra plastic attached to a molding along the parting line.
Flash must be removed (i.e. deflashed) before the part can be considered
finished.
– A technique of making inert thermoplastic items
responsive to adhesives, inks and paints. The submersion of the item
in an open flame induces surface oxidation.
– A procedure
that diminishes permeability and increases the chemical resistance of
different plastics and elastomers. The exposure
of polymers to fluorine gas causes molecular structural surface changes.
– The thinnest part of the wall of a bottle.
– The hollow part of a group of molds that forms a
container on bottle machines.
– A vertical line formed at the point where the mold
halves meet, the prominence of which depends on the accuracy with which
the halves are matched.
– Bottles comprised of layers of special plastic
materials that are co-extruded to preserve and use the unique characteristics
of each material to improve the barrier qualities of the container and
increase the product shelf life.
– Refers to the natural translucent appearance of
the plastic material of containers and closures.
– The component of the molding apparatus that produces
the bottle finish.
– The collapse of a portion of a container structure,
due to a loss of interior pressure, which occurs during aging and storage.
– The empty cylinder of plastic melt that emerges from
the extruder die head and expands in the mold space from air pressure,
producing the molded part.
– The mark on a plastic bottle where the two halves
of the mold meet at the point of closure.
– A heat-softened polymer shaped like a thick test tube
with neck threads that is inflated while inside a blow mold.
– A procedure for mechanically altering the weight,
size or wall thickness of the parison as it forms.
– A decrease in dimension of an article after the molding
process, which is caused by the contraction of the plastic material upon
cooling.
– The seam that joins both edges of a blank forming a
body.
– Any treatment technique, including chemical,
electronic and flame treatments, that makes plastic receptive to inks,
lacquers and adhesives.
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