Devleopment and Industrial Realization of Glass Mat Preforming Equipment for Rtm and Shim 91A101
As a result of the rapid expansion of liquid molding in closed
mold, fiberglass mat performers have rapidly changed in order to
meet the high production requirements. The reasons for this
interest in RTM and SRIM can be found in the considerable benefits
offered by this technology which include: 1) ability to produce
very large parts (weights up to 70 kg are currently being
prototyped); 2) continuous and homogeneous reinforcement or even
predetermined distribution of the reinforcement in the mold; 3) the
ability to produce structures using cores of various types; and 4)
the ability to use large inserts, even if they are metallic. The
creation and development of this technology has been possible
thanks to the introduction of very low viscosity reactive polymers.
These materials permits very fast impregnation of the reinforcement
in the closed model, thereby decreasing the cure time and the
overall cycle time.
Increased productivity, however, can be achieved only if the
injection and press systems suited to this technology are actually
available, and if it is possible to automate all process phases of
Cannon has developed many solutions for each phase of liquid
molding technology, such as dual injection points metering units
(SRIM), shuttle bed clamps and above all industrial plants designed
for fiberglass mat preforming.
Different preforming techniques are available today, each one
having its supporters, abut everyone is in agreement that the
reduction of cut-offs and lowering of preform prices, thanks to a
high level of automation, must occur to grand the competitiveness
of the SRIM and industrial RTM processes in the future.
Materials Innovation and Their Applications in the Transportation Industry