An air-water mixture is found from the heat and mass balance to be at 60°C (333 K) and 0.025 kg/kg (25 g/kg) absolute humidity. Calculate the other main parameters for the mixture. Take atmospheric pressure as 101,325 Pa.
Method: Consult item (vi) in Table 12-5 for the calculation methodology.
From the initial terminology section, specific humidity YW = 0.02439 kg/kg, mole ratio z = 0.0402 kmol/kmol, mole fraction y = 0.
Melt Processing Melt processing is the most important, most economical way of shaping plastics. It can be used for those thermoplastics with melting points and viscosity low enough not to subject die materials to excessive temperatures and stresses.
(a) Melt Processing of Thermoplastics: The raw material to be processed is usually supplied in the form of regular shape and even-size granules, because this makes quantity metering easier and quicker and leads to more uniform and predictable heating.
Understand the process flow on how to manufacture the product. Identify the hazards from its process step (task). Decide who might be harmed and how. Evaluate the risks and decide on precautions. Record your findings and implement them 6. Review your assessment and update if necessary. Plastic Toys Production Process Flow: Fig: process flow of toys production
Types of Materials used for Injection Molding SL. Material name Description Applications 1 Acetal Strong, rigid, excellent fatigue resistance, excellent creep resistance, chemical resistance, moisture resistance, naturally opaque white, low/medium cost Bearings, cams, gears, handles, plumbing components, rollers, rotors, slide guides, valves 2 Acrylic Rigid, brittle, scratch resistant, transparent, optical clarity, low/medium cost Display stands, knobs, lenses, light housings, panels, reflectors, signs, shelves, trays 3 Acrylonitrile Butadiene Styrene Strong, flexible, low mold shrinkage (tight tolerances), chemical resistance, electroplating capability, naturally opaque, low/medium cost Automotive (consoles, panels, trim, vents), boxes, gauges, housings, inhalers, toys 4 Cellulose Acetate Tough, transparent, high cost Handles, eyeglass frames 5 Polyamide 6 (Nylon) High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque/white, medium/high cost Bearings, bushings, gears, rollers, wheels 6 Polyamide 6/6 (Nylon) High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque/white, medium/high cost Handles, levers, small housings, zip ties 7 Polyamide 11+12 (Nylon) High strength, fatigue resistance, chemical resistance, low creep, low friction, almost opaque to clear, very high cost Air filters, eyeglass frames, safety masks 8 Polycarbonate Very tough, temperature resistance, dimensional stability, transparent, high cost Automotive (panels, lenses, consoles), bottles, containers, housings, light covers, reflectors, safety helmets, and shields 9 Polyester - Thermoplastic Rigid, heat resistance, chemical resistance, medium/high cost Automotive (filters, handles, pumps), bearings, cams, electrical components (connectors, sensors), gears, housings, rollers, switches, valves 10 Polyether Tough, very high chemical resistance, clear, very high-cost Sulphone Valves 11 Polyetheretherketone Strong, thermal stability, chemical resistance, abrasion resistance, low moisture absorption Aircraft components, electrical connectors, pump impellers, seals 12 Polyetherimide Heat resistance, flame resistance, transparent (amber color) Electrical components (connectors, boards, switches), covers, shields, surgical tools 13 Polyethylene - Low Density Lightweight, tough and flexible, excellent chemical resistance, natural waxy appearance, low cost Kitchenware, housings, covers, and containers 14 Polyethylene - High Density Tough and stiff, excellent chemical resistance, natural waxy appearance, low cost Chair seats, housings, covers, and containers 15 Polyphenylene Oxide Tough, heat resistance, flame resistance, dimensional stability, low water absorption, electroplating capability, high cost Automotive (housings, panels), electrical components, housings, plumbing components 16 Polyphenylene Sulphide Very high strength, heat resistance, brown, very high cost Bearings, covers, fuel system components, guides, switches, and shields 17 Polypropylene Lightweight, heat resistance, high chemical resistance, scratch resistance, natural waxy appearance, tough and stiff, low cost.