The document discusses predicting wall thickness distribution in thermoformed molds. It describes the materials used, which are typically low-specific heat thermoplastics like polystyrene, polyvinyl chloride, acrylonitrile butadiene styrene, and polymethyl methacrylate. The stages of molding the preform, heating the parison, and cooling the product once it contacts the mold are outlined. Equations created by PGE to predict wall thickness distribution and Osswald's studies of thickness profiles in open hemispherical and cylindrical molds are also summarized to help produce more uniform distributions.

1. República Bolivariana de Venezuela
Ministerio del Poder Popular para la Educación Superior
Instituto Universitario Politécnico Santiago Mariño
Prediction of Wall Thickness Distribution in
Thermoformed molds Simple
Bachiller:
Carlos Velásquez Marín
C.I.: 24105850
Materia: Ingles Técnico

2. Materials
Molding the
preform, (pressure,
vacuum, pressure and
vacuum or a counter).
Heating the
parison, either by
radiation, convection or
contact.
Stages
Prediction of Wall Thickness
Distribution in
Thermoformed molds Simple
Product cooling,
starts when the
thermoplastic contact
with the mold
The materials used are
always thermoplastic
with low specific heat.
The most widely used
thermoplastics are PS,
PVC, ABS, PMMA, TPRF
among others.
Exceptions such as
acetals, polyamides and
fluorocarbons, which
are not used normally.
Thermoforming is suitable
for mass production with
high efficiency.
Analysis of geometric elements
(GEA)
PGE created several equations
to predict the distribution of
wall thickness
Osswald prediction distribution
profiles Studied open hemispherical
cylindrical thermoforming mold
thickness. That studies to help
produce more uniform thickness
distribution.