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Rotational Molding Terms
(http://www.blowmoldedplastic.com)
– A common process used to form hollow, thermoplastic shapes, such
as bottles and containers. Two general types of blow molding are extrusion
and injection blow molding.
– The
process in which individual polymer particles are joined together by a
molecular bond.
– The ability
of a material to withstand various chemical agents. Plastic is capable
of enduring many of these chemicals, making it very useful for holding
tanks and other containers.
– The oxidation and
deformation of a material, such as the rusting of iron, due to a chemical
reaction.
– The time it takes
from the first stage of rotational molding, in which the plastic is loaded,
until the plastic completes its final stage and is removed from the mold.
– The removal of
unwanted material from a molded product, especially from the areas where
parting lines of the mold may have caused excess material to be formed.
– A significant parameter
for polyethylene (PE) that affects the properties, such as stiffness and
impact strength, of the end product.
– The ability of
a material to return to its original form after stress has been applied
and quickly removed.
– The temperature
at which the plastic resin melts and begins to adhere to the surface of
the mold.
– The ability
of a plastic to be ground into a fine powder. Most plastics are ground
prior to being loaded into the mold.
– The measure
of the ability of a plastic to withstand fracture by shock.
– A generic name for
semi-synthetic or synthetic materials that can be extruded or molded into
films or objects. Plastic
materials are also used for coatings and adhesives.
– A chain of molecules
that is formed by the bonding of individual repeating units (monomers).
– The measure of
the speed of a plastic powder when poured through a funnel. For a plastic
powder to be acceptable for rotomolding, it must be capable of flowing
at least 185 grams/minute.
– Any of various semisolid
or solid natural organic materials that are usually translucent or transparent.
Resins are mostly utilized in plastics, adhesives and coatings.
– The “arms”
of the rotational molding machine that are responsible for moving the
molds between different stages. Spindles also spin on the horizontal and
vertical axes to create a uniform filling within the mold.
– The ability
of a resin to withstand specified temperatures. Less thermally stable
materials can be rotomolded only under controlled conditions with extreme
care.
– A material that
will soften when repeatedly heated and cooled. Examples of thermoplastics
include polyethylenes, polypropylene (PP), vinyl and nylons.
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