What Are Sheet-Molding Compounds (Smc)? Bulk-Molding Compounds (Bmc)?

(5). a) What are sheet-molding enhances (SMC)? Bulk-molding compounds (BMC)? Sheet-molding compound (SMC) is a fiber chicken feed beef up thermoset compound in sheet form, usually rolled into coils interleaved with plastic conduct to prevent auto adhesion. Made by dispensing mixed resin, fillers, aging agent, accelerator and mold release agent onto two moving sheets of polyethylene film. The tear down one also contains chopped glass roving or glass mat. SMC can be molded into complex shapes with little scrap.Sheet molding compound (SMC) is fiberglass strengthened abstr theatrical role material, produced in a sheet put Bulk-molding compound (BMC) is a combination of chopped glass strands andResinin the form of a bulkpre-preg. BMC is suitable for either compression or injection molding. Injection molding of BMC is used to produce complex components such as electrical equipment, car components, housings for electrical appliances and tools, in orotund industrial volumes. Un like SMC, it is not necessary to include a maturation stage.Consequently, BMC pre-preg formulations contain higher filler contents. The chopped glass strands vary in length depending on the level of performance required. Reinforcement content in general ranges between 15 and 20 percent however, it may reach 25 percent for the highest performance. BMC uses set about reinforcement content than SMC and permits higher filler loadings with lower costs. b) List FOUR (4) types of the forms in which reinforcement fibers appear in composite materials?Based on the form of reinforcement, common composite materials can be classified as follows 1. Fibers as the reinforcement (Fibrous Composites) a. Random fiber (short fiber) reinforced composites b. Continuous fiber (long fiber) reinforced composites 2. Particles as the reinforcement (Particulate composites) 3. Flat flakes as the reinforcement (Flake composites) 4. Fillers as the reinforcement (Filler composites) c) Describe the problems invol ved in recycle products made from reinforced plastics.The main problems are that recycling usually requires the use of a single type of material, and that some plastics (mainly hard and brittle polymers) are more difficult to chop into small pieces for further processing than others. With reinforced plastics, this requires that the reinforcement be separated from the matrix, a very difficult childbed and uneconomical task. Note that matrices are often thermosets, so it is not interoperable to melt the matrix and separate the fibers from a molten phase.