Processing Duroplastics
Phenoplasts are made up of phenol (C6.H5.OH – derived from coal tar) and formaldehyde (HCHO). These plastics smell faintly of carbolic acid. Aminoplasts are made up of urea and formaldehyde. Urea is produced from ammonia (NH3) and carbon dioxide (CO2). Because this plastic are brittle, they are mixed with filler (rock flour, asbestos fibre, sawdust, paper scraps). This make the plastic stronger, more elastic and less brittle.
Duroplastic molding material is processed by compression molding. A measured quantity of the preheated molding material is poured into the open mold. The mold is heated continuously, when the compression mold is shut, the plastic mass fills it completely. The mold is heated to between 140oC and 170oC, and the molding pressure is about 100 bar. After it has hardened, the molded part is ejected from the opened mold.
The natural color of phenoplasts is yellowish – brown; finished goods are; radio cases, light switches, socket, plates and tubes. Aminoplast are odourless, tasteless, and colorless. Finished goods are housing and parts for household appliances, telephones and electrical goods. Samples smell of burnt hair when incenerated.
Laminated plastics are stronger then compression moldings. They consist of layer upon layer of paper of textile webs (filler) impregnated with phenolic resins. Heated metal process are use to press the plates of formed layers on to each other. When it is in the form of plates, laminating material is often known as hard paper or hard tissue. Gear wheels, bearing bushes, cable pulleys, sheathing and insulation material are very strong malleable and easily machined. Trade name are; Durcoton, Linex, Novotex and Resistex for hard tissue; Pertinax and Trolitax for hard paper.
Densified Laminated Wood is produced by bonding thin layers of wood with synthetic resins. Finished goods are: furniture, gear wheels, plywood panels. Trade name: Lignotol.
Duroplastic molding material is processed by compression molding. A measured quantity of the preheated molding material is poured into the open mold. The mold is heated continuously, when the compression mold is shut, the plastic mass fills it completely. The mold is heated to between 140oC and 170oC, and the molding pressure is about 100 bar. After it has hardened, the molded part is ejected from the opened mold.
The natural color of phenoplasts is yellowish – brown; finished goods are; radio cases, light switches, socket, plates and tubes. Aminoplast are odourless, tasteless, and colorless. Finished goods are housing and parts for household appliances, telephones and electrical goods. Samples smell of burnt hair when incenerated.
Laminated plastics are stronger then compression moldings. They consist of layer upon layer of paper of textile webs (filler) impregnated with phenolic resins. Heated metal process are use to press the plates of formed layers on to each other. When it is in the form of plates, laminating material is often known as hard paper or hard tissue. Gear wheels, bearing bushes, cable pulleys, sheathing and insulation material are very strong malleable and easily machined. Tr
Densified Laminated Wood is produced by bonding thin layers of wood with synthetic resins. Finished goods are: furniture, gear wheels, plywood panels. Trade name: Lignotol.
Thursday, August 12, 2010
Paint and Plastic Stripping
Plastic that coated to metal usually difficult to clean, stripping process of plastic that coated on metal beside need of special technology also used high temperature to make the plastic can removed easily. The problem when use high temperature sometime make the plastic are burn and usually will create of pollution to the air, because of resulting smoke that pollute the air.
New technology on stripping this parts are immerse in a hot fluidized sand bed which heated with controlled temperature, the temperature is up and controlled until 420 – 450oC. By control the temperature of stripping process between those setting will keep the plastic not burnt but stripped from the metal that slicked to. This process have been use in many industry and many service company that need to strip of certain coating material from metal. The organic adhering the metal parts will be removed without creating time is less then one hour. Typically parts to be cleaned are paint hangers, grated, dies, nozzles, extrusion and screw. By using of certain stripping solution will make this stripping process perfect completed.
Stripping process also used for other material like paint, rubber other than just plastic. Every material need certain temperature in order can work better, because each material have different melting point. If you need to determine the temperature you can find of melting point from hand book of certain material that you need. Like Chemical Engineering Handbook and other chemicals handbook.
New technology on stripping this parts are immerse in a hot fluidized sand bed which heated with controlled temperature, the temperature is up and controlled until 420 – 450oC. By control the temperature of stripping process between those setting will keep the plastic not burnt but stripped from the metal that slicked to. This process have been use in many industry and many service company that need to strip of certain coating material from metal. The organic adhering the metal parts will be removed without creating time is less then one hour. Typically parts to be cleaned are paint hangers, grated, dies, nozzles, extrusion and screw. By using of certain stripping solution will make this stripping process perfect completed.
Stripping process also used for other material like paint, rubber other than just plastic. Every material need certain temperature in order can work better, because each material have different melting point. If you need to determine the temperature you can find of melting point from hand book of certain material that you need. Like Chemical Engineering Handbook and other chemicals handbook.
