PT ZONE: Application Profiles
The automation of plastics processes such as plastics extrusion, compounding and resin manufacturing can be done with bulk material handling equipment and controls. This application profile section provides an in depth look at various plastics processing applications, materials fed in these applications, and components incorporated into a system.
PVC is used in the manufacture of end-use products for a wide range of applications in the consumer, construction, food and medical industries. Products made with PVC exhibit good impact strength, stiffness and strength-to-weight ratio. PVC products offer good dimensional stability at ambient temperatures, resistance to chemicals and oils, durability, and non-flammability character.
The production of Wood-Plastic Composites typically uses a fine wood waste (cellulose based fiber fillers such as hardwood, softwood, plywood, peanut hulls, bamboo, straw, etc.) mixed with various plastics (PP, PE, PVC). The powder is extruded to a doughlike consistency and then extruded to the desired shape. Additives such as colorants, coupling agents, stabilizers, blowing agents, reinforcing agents, foaming agents, and lubricants help tailor the plastic end product to the target area of application.
Long Fiber Reinforced Thermoplastics
Glass fibers of ½" (12 mm) up to 2" (50 mm) length give much higher stiffness, strength and toughness than the 1/8" (3 mm) fibers that have been used for reinforcement for decades. Long Fiber Reinforced Thermoplastics (LFT) have excellent mechanical properties and stiffness-to-weight ratio which is of great interest to the automotive industry. These in-line compounding processes for long fiber material offer users more flexibility, as they are able to both compound and process such materials in accordance with their own formulation and also use ready made compounds.
Calcium Carbonate in Plastics Compounding
Calcium carbonate may be used with a myriad of thermoplastic resins. Polypropylene compounds are often filled with calcium carbonate to increase rigidity, an important requirement for operations at high temperatures. In PVC, calcium carbonate is used with flexible compounds such as tubing, wire and cable insulation, latex gloves, trash bags and in rigid compounds such as extruded pipes, conduits and window profiles.
BOPP Film Production
There is a clear trend in specialty film production to multi-layer film types, where more and more co-rotating twin screw extruders are utilized. This enables film manufacturers to simultaneously feed a large variety of additives directly into the extruding process, increasing flexibility and reducing production costs. This is very beneficial in the production of multi-layer high barrier films, balanced shrink films, etc.
Continuous Hot Melt Production