Thermoplastics are widely used as a raw material in the injection molding process. Let's have a look at the types of thermoplastics used in the injection molding process along with their applications:
ABS: ABS is an opaque thermoplastic amorphous polymer comprising of three monomers. This makes it an excellent engineering material for injection molding. ABS has excellent chemical and thermal stability, along with strength. ABS is a fantastic all-around engineering plastic and can be found in molds of wall sockets, automotive trim, printers, vacuum cleaners, hard hats, kitchen utensils, plastic toys, and musical instruments.
POM: POM is a high strength, low friction engineering thermoplastic with excellent wear properties in wet and dry environments. Also, acetal makes an outstanding choice for applications that require complex and tight tolerances. POM can be found in small gear wheels, eyeglass frames, ball bearings, ski buildings, fasteners, guns, knife handles, and lock systems. The material is widely used in the automotive and consumer electronics industry.
PA6 and PA66: Nylon (PA) 6 and 66 are both synthetic polymers called polyamides. Most nylons, including 6 and 66, are semi-crystalline and possess good strength and durability for different manufacturing applications. Nylon can be found in sleeves and bearings, wear pads, hammerheads, gear wheels, seal rings, cutting boards, marine cleats.
PC: Polycarbonate (PC) plastics are naturally transparent amorphous thermoplastic. PC is excellent when impact resistance and transparency are a product requirement, e.g., bulletproof glass. PC is commonly used for plastic lenses in eyewear, in medical devices, automotive components, protective gear, greenhouses, digital disks (CDs, DVDs, and Blu-ray), and exterior lighting fixtures.
PP: Polypropylene (PP) is a thermoplastic "addition polymer" made from a combination of propylene monomers. Some of PP's most significant properties are good chemical resistance, elasticity and toughness, fatigue resistance, sound insulation, and good impact resistance. PP is one of the most used plastics in the injection molding industry. One of PP's main characteristics is that it can be molded into a living hinge due to its good fatigue resistance. Other applications include food packaging, consumer products, car bumper toys, container tops.
PBT: Polybutylene Terephthalate (PBT) is a semi-crystalline off-white or white polyester similar to PET's composition and properties. PBT resists abrasion, temperature, moisture. It acts as a significant electrical barrier with superb impact strength. It is subjected to failure if it is subjected to stress. It is difficult to mold to too high tolerances. PBT is often used for food processing machinery applications when low moisture absorption, resistance to staining, or resistance to cleaning chemicals is required. It can also be found in electronic, auto parts, and TV set accessories.
The following parameters are required to calculate the clamping force:
The process begins by slicing 3D CAD data into layers.
The data is then transferred to a machine which constructs the part layer-by-layer upon a build platform.
The thermoplastics, made up of reels of thread are used to create each cross-section of the part.
Uncoiled material is slowly extruded through heated nozzles.
The extrusion nozzles precisely lay down material upon the preceding layers.
The finished part is removed from the build platform and cleaned of its support material.
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