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Altuglas process guide INJECTION MOULDING RESINS Te c h n i c a l manual CCONTENTS INTRODUCTION A LT U G L A S GENERAL CHARACTERISTICS OF ALTUGLAS THE RANGE APPLICATIONS PRODUCTS FEATURES PROCESSABILITY HEAT RESISTANCE WEATHERABILITY MELT FLOW OF ALTUGLAS

INJECTION MOULDING RESINS Te c h n i c a l manual CCONTENTS INTRODUCTION A LT U G L A S GENERAL CHARACTERISTICS OF ALTUGLAS THE RANGE APPLICATIONS PRODUCTS FEATURES PROCESSABILITY HEAT RESISTANCE WEATHERABILITY MELT FLOW OF ALTUGLAS GRADES EQUIPMENT MOULD DESIGN EQUIPMENT CONSIDERATIONS Injection moulding machine clamping force Screw design MOULD DESIGN Feeding system sprues runners gates layout Hot runners system Cavity geometry and shrinkage INJECTION MOULDING PROCESS MATERIAL HANDLING CONSIDERATION PROCESSING TEMPERATURES PRESSURE AND INJECTION SPEED MOULDING DEFECTS INJECTION MOULDING TROUBLESHOOTING GUIDE TYPICAL EXAMPLE AND SOLUTION OF MOULDING DEFECT ORIENTATION AND RESIDUAL STRESS ANNEALING POST MOULDING OPERATIONS ASSEMBLING DECORATION MACHINING CIntroduction ALTUGLAS Altuglas is the registered trade name for Altuglas International products made of polymethylmethacrylate PMMA in the form of granules for injection moulding and extrusion is virtually una ?ected by a wide range of commercial products including many detergent solutions and cleaners beverages and foodstu ?s It is not recommended for use with chlorinated and aromatic hydrocarbons esters or ketones The chemical resistance of Altuglas is summarized in table GENERAL CHARACTERISTICS OF ALTUGLAS Altuglas resins o ?er high thermal stability excellent transparency and a hard surface which protects their brilliance and impacts high resistance to abrasion Most Altuglas products are rated HB according the UL standard Among the many desirable properties of Altuglas acrylic resins two are pre-eminent Altuglas acrylic resin is a rigid plastic with good strength properties Although the resistance of Altuglas resin to sudden impact is lower than that of some plastics it is several times greater than that of glass If your design requires even greater impact strength ask us about the family of Altuglas impact - modi ?ed acrylic resins Properties like excellent clarity good chemical resistance and high rigidity as well as the availability of UV transmitting resins enable Altuglas acrylic moulding resins to be used through out the medical industry Unsurpassed durability indoors and outdoors Superlative optical properties and clarity Most applications of Altuglas acrylic resin take advantage of one or both of these outstanding properties For example Altuglas resin is the material of choice for moulding signal light lenses for automotive aircraft and marine applications because of its superb optical quality as a light transmitting medium and its proven ability to endure many years of continuous outdoor exposure with little or no change colour or appearance Other applications which demand the ultimate in weather resistance provided by Altuglas resin are outdoor lighting lenses and shields and moulded letters or extruded sheets for internally illuminated signs In addition to unsurpassed resistance to sunlight Altuglas acrylic resin is una ?ected by long-term exposure to uorescent light and it is the material most commonly speci ?ed by lighting engineers and architects for lighting applications Colourless Altuglas acrylic lighting ?xture lenses are widely available either as injection moulded parts or extrusion with prismatic patterns also di ?users are extruded from white translucent Altuglas resin Fluorescent ?xtures with Altuglas acrylic lenses can be operated continuously for many years without signi ?cant yellowing or measurable