nd we will come back friends we now see the subject manufacturing process in this manufacturing process subject we see the we are seeing the topic processing of polymers it is the unit of the manufacturing process in this topic covered are processing of polymers processing of polymers, metacomposites and lab method spray up processes compression molding processing of PMC and lab method in this method is shown in figure above the hand lab method is shown in figure it is shown in slide it contains resin poured in the open mold resin composite laminated lorer polymer resin reinforcement release gel it is the resin in the figure and lab process in this process gel code is applied to the open mold fiber glass reinforcement is placed in the mold base resin mixed with catalyst is applied by pouring by pouring and brushing layer is made up made by building layer upon layer to obtain the desired thickness production is very low simplest method design changes are rapidly readily made disadvantages time consuming environmental problem the composite will have smooth surface at one side and rough surface at the other side applications manufacturing of aircraft wins motor boards train knows train control console swimming pool etc spray up processes it is a open mold type of technique also with faster than hand type hand layup process it is shown in the figure that is the resin supply catalyst chip or gun reinforcement polymer resin and gel gel is shown in the figure now we will see the compression molding it uses pre-eated molds mounted on a hydraulic or mechanical press generally it having two steps creating and pressurizing compression molding it is shown in the figure upper mobile mold half charge lower fixed mold half ejection pin these are shown in the figure compression molding also shown in the figure upper movable mold half charge lower fixed mold half and ejector pin these are the figures of compression molding advantages short cycle time high degree of productivity automator process good dimensional accuracy low cost improved impact strength disadvantages large curing time parting line presents on the final product scrap cannot be processed reprocess high initial capital investment this is the topic we have seen the processing of polymer thank you