MOTOROLA MVME2434-3 Remote control module

As glass fibre reinforcement in most cases cut glass rovings are used. Calcium carbonate (chalk) is the most commonly used filler. Magnesium oxide in the formulation can react with the free acid groups of the resin. This results after a few days in an enormous increase of the viscosity of the SMC formulation. A leather-like sheet is formed, which is almost non-sticky and easy to handle. In this stage the resin is still not polymerized. In the production of SMC the resin is premixed with all the components of the formulation to a paste. On the SMC machine first the paste is dosed on a polyamide or polyethylene film by means of a doctor blade. In the next stage glass rovings are cut to lengths of 25 – 50 mm and sprinkled on top of the resin layer.

Then a second film

 on which also a resin paste is applied, is put on top of the glass fibre. The whole package between the two films is then pulled through a compacting section of the machine. In this phase the glass fibre is impregnated and the compound is homogenized. At the end the SMC is rolled and stored during a few days to give the thickening reaction sufficient time. The sheet is allowed to mature for 48 hours. The ready and thickened SMC is stored and sold in the form of rolls. Depending on the requirements for the finished product a wide variety of formulations is nowadays available. Products are made that possess high weather - or corrosion resistance, excellent surface finish or high mechanical properties.

                                                                        

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