| Extrusion is a manufacturing technique used to | | | | coating, the thermoplastic is thrust out around a |
| form thermoplastic compounds into unremitting | | | | continuing length of wire or cable which like the |
| products such as sheeting, rods, cast film, tubes, | | | | plastic, passes through the extruder die. The |
| filaments, cable, cord, mono filaments, synthetic | | | | coated wire is wound on drums after cooling. |
| fibers, hollow sections for blow molding, | | | | Applications of extrusion are thin film and sheet |
| compounding, reclaim of plastic pellets, and to coat | | | | extrusions can be used in sealing, packaging, |
| wire. An extrusion mechanism includes twin screw | | | | electronics, and other applications, flat sheets are |
| systems, which are generally used for PVC pipe | | | | extruded to customer specified thickness and |
| or profiles and single screw systems, which are | | | | dimensions, rigid pipe extrusion applications can |
| used for these and other extruded products. | | | | include fluid media transport or custom chemical |
| In this technique, plastic chips or pellets is first | | | | and unusual strength or dimensional properties, |
| loaded and fed into a long heating chamber | | | | flexible tubing and hose can be extruded with |
| through which it is stimulated by the action of a | | | | customer specified dimensions, wall thickness, |
| continuously revolving screw. At the opposite of | | | | mechanical and chemical properties, tubing can |
| the heating chamber the molten plastic is forced | | | | often be made in multilayer and special compound |
| out through a small hole or dies with the shape | | | | configurations. |
| desired in the finished product. As the plastic | | | | Advantages of extrusion are higher potency |
| extrusion comes from the die, it is fed onto a | | | | because of severe strain hardening, dimensional |
| conveyor belt where it is cooled, most frequently | | | | accurateness, good quality finish, economy due to |
| by blowers or by immersion in water. | | | | smaller number of process and fewer machining |
| In the process of wide film or sheeting, the plastic | | | | required. |
| is molded in the form of a tube. This tube may | | | | Certification required for maintain quality systems |
| be split as it comes from the die and then | | | | are ISO 9001:2000, AS9100, ISO/TS 16949, QS |
| stretched and thinned to the size desired in the | | | | 9000, MIL-SPEC etc. |
| finished film and in the case of wire and cable | | | | |