(3-0-3) This course is designed to familiarize students with the manufacturing techniques for converting polymer feedstocks into plastic end products. Describe the problems and the countermeasures to develop radiation processing techniques to polymer materials for radiation application in industrial sector. It is said that when the processing temperatures is higher, the quantity of water that can be tolerated is lower. Plasma processing presents some major advantages: it is a dry , clean, and very fast process, having a very low specific consumption of chemicals and energy, while it affects only the surface and not the bulk material . POLYMER PROCESSING The main goal of polymer processing is to produce a usable object. Products made by sheet thermoforming include skin and blisterpacks, individual containers for jelly or cream, vials, cups, tubs, trays and lids. Processing techniques to produce polymeric nanofibers include phase separation, self-assembly, and electrospinning (Dahlin et al., 2011). Give examples of applications of radiation in industry. Heat stability of colorants is not simply a function of temperature. �����Oh�� +'��0 � � � � � � � � ( It involves a study of various plastics processing techniques. Film Blowing The film blowing process basically consists of a extruding a tube of molten thermoplastic and continuously inflating it to several times initial diameter, to form a thin tubular product that can be used directly, or slit to form a flat film. ME 318 Manufacturing Techniques PAGE 11 � � � O Y � � � � � � � 5 J � � 0 1 � � � � a b j  � � V W � � ) ; :! Phase separation does not require specialized equipment, needs several steps to produce nanofibers of a limited number of polymers, and scaling-up is difficult to achieve. Ex: Buckets, Automobile Parts, Crates, Tanks, Pipes, Bottles, Carry bags, Ropes, Profiles etc. Classification of processing methods 1. Compression molding basically involves the pressing of a deformable material charge between the two halves of a heated mold, and its transformation into a solid product under the effect of the elevated mold temperature. These methods are interesting especially for monitoring of complex polymer systems and when reactions Liquid foodstuffs are increasingly packaged in narrow neck plastic PET bottles. As many as millions of parts per day can be produced with a tool featuring several hundred cavities. Sink marks and voids are caused by localized shrinkage of the material at thick sections without sufficient compensation when the part is cooling. This is necessary to reduce non-uniform part shrinkage, which leads to part warpage. technique has been applied to deposit crystalline polymers such as polyethylene (PE),[66]poly (vinylidene fluoride) (PVDF),[30]and π-conjugated polymers. L � POLYMER PROCESSING The processing of polymeric materials -plastics, elastomers and composites- is characterized by a wide variety of distinct methods or techniques. My major research (around 57million total cash grants and contracts) is in-process measurements on polymers, real time computer control, analysis and computer modelling of polymer processing. This has included polymer injection molding ( Deshpande and Fleck, 2001a ), wire cutting of a polymer block ( Ho et al., 2010 ) and rapid prototyping techniques ( Chiras et al., 2002 ). Versatilely functional polymers have been developed to cater the urgent demands in industrial applications. Larger products are generally made from cut sheets at much shower rates; the heating stage often is the limiting factor. Jetting occurs when polymer melt is pushed at a high velocity through restrictive areas, such as the nozzle, runner, or gate, into open, thicker areas, without forming contact with the mold wall. It becomes trapped by converging polymer melt fronts or because it failed to escape from the mold vents, or mold inserts, which also act as vents. ��՜.�� +,��D ��՜.�� +,��P h p � � � � � � � � � � � Bo�azi�i University T �0 � POLYMER PROCESSING Title ( 8 @ _PID_HLINKS � A � 6 : f i g s \ p o l y 1 . Structures, we understand as a unit made up of two or more molecules, join together to a! Unit made up of two or more molecules, join together to form long! Parts per day can be defined as the learning algorithm improves inside the mold can be defined as the is... Is not simply a function of temperature localized shrinkage of the material at sections. 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