Blow Molding Types and Terms
Blow Molded Plastics Types
- are formed by blow molding processes.
- are plastic parts formed by blow molding.
- create hollow plastic parts.
- is
the process in which a hot parison or preform is placed into a two-part
mold. In the mold, the parison or preform is inflated with compressed
air, which presses it against the walls, and then is cooled and removed
by separating the mold halves.
- blends
the two methods of blow molding and injection molding and is typically
used in the manufacturing of soda bottles. A preform, which is similar
to the parison, is either injection plastic
molded and then transferred to a blow molding machine, or the injection
and blow molders are combined.
- is a two-stage, stretch blow molding process in
which a preform is injection molded and then transferred to another
station where it is blown and ejected from the machine.
- is a process that uses inflated thermoplastics
in molds.
- are hollow containers made of plastic.
- is
a stretch blow molding process in which a preform is injection molded
by a vendor and then purchased and reheated by another company.
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.