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This Injection Moulding mini guide is specially designed as a handy guide and quick reference for use on the shop floor. It includes details on pre-drying and temperature settings of machine, mould and material for all standard GE Plastics’ resins. Amorphous injection moulding resins, Semi-crystalline injection moulding resins, When can resin pick up moisture? during transport and storage during prolonged exposure to atmosphere, even after initial drying on its way to the machine hopper, when no hot (dry) air is used in case of high relative humidity. Importance of pre-drying. Most thermoplastics absorb atmospheric moisture, which under normal processing conditions can cause degradation of the polymer. Specially Lexan, Ultem and Valox as hygroscopic resins demand proper re-drying before moulding: these polymers do react with moisture at high (processing) temperatures. Choosing a machine, Residence time · residence time - always related to melt temperature · residence time - maximum 6 to 12 min. depending on resin type · too long - material degradation. Screw geometry and design. Nozzles · open nozzles - for all resins · reversed taper nozzles - for Cycolac resin, not for Valox resin · shut-off nozzles - for Supec resin, not advised for other resins · nozzle orifices - as large as possible, 1 mm smaller than sprue top · nozzle temperature - heater band plus. Setting up production, safety guide. General recommendations for safety in injection moulding are: appropriate protective clothing should always be worn when handling hot materials and during cleaning operations. Preparation before setting, Setting mould and machine, Setting the injection unit. Setting temperatures, speeds and pressures. Setting Injection Pressure. Optimizing production. mechanical control, weight control.
Tags : injection moulding, material degradation, ge plastics, valox, production safety, time residence, relative humidity, residence time, ultem, mechanical control, time maximum, atmospheric moisture, temperature settings, handy guide, sprue
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