1996-04-01

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 the plant.
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.

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