- Information about technological processes
and working systems . Everybody can contribute with documentation,
that must be sended to firstname.lastname@example.org
accompanied with the name of the source, and if possible the link
of the site one where there is the possibility of a deepening.
- The rotational molding process starts with
a good quality mold that is placed in a molding machine that has
a loading, heating, and cooling area.
Several molds may be placed on the machine at the same time.
Pre-measured plastic resin is loaded into each mold, and then
the molds are moved into the oven where they are slowly rotated
on both the vertical and horizontal axis. The melting resin
sticks to the hot mold and coats every surface evenly. The mold
continues to rotate during the cooling cycle so the parts retain
an even wall thickness.
Once the parts are cooled, they are released from the mold.
The rotational speed, heating and cooling times are all controlled
throughout the process
- Rotational molding offers design advantages
over other molding processes. With proper design, parts that are
assembled from several pieces can be molded as one part, eliminating
expensive fabrication costs.
The process also has a number of inherent
design strengths, such as consistent wall thickness and strong
outside corners that are virtually stress free. If additional
strength is required, reinforcing ribs can be designed into
Rotational molding delivers the product
the designer envisions. Designers can select the best material
for their application, including materials that meet FDA requirements.
Additives to help make the part weather resistant, flame retardant,
or static free can be specified.
Inserts, threads, handles, minor
undercuts, flat surfaces that eliminate draft angles or fine
surface detail can all be part of the design. Designers also
have the option of multi-wall molding that can be either hollow
or foam filled.
More information: http://www.rotomolding.org/i4a/pages/index.cfm?pageid=3283