Various types of melt mixing equipment are used, from roll mills and batch mixers to single-screw and twin-screw extruders. Continuous compounding (extruder) is the most commonly used equipment because it provides products of consistent quality and reduces operating costs. There are two types of mixing: distributed mixed materials can be evenly distributed in the compound without the use of high shear stresses. This type of mixed liquid is called extensional mixing or laminar mixing.
Extrusion blow molds are a method of making hollow thermoplastic parts. Well-known blow molding objects are bottles, barrels, cans, boxes and all containers for packaging food, beverages, cosmetics, medicines and daily necessities. Large blow-molded containers are commonly used for packaging of chemical products, lubricants and bulk materials. Other blow molded products include balls, bellows and toys. For the automotive industry, fuel tanks, car shock absorbers, seat backs, center brackets, and armrest and headrest overlays are blow molded. For machinery and furniture manufacturing, blow molded parts are housings, door frames, racks, earthenware pots or boxes with an open face.
