Extrusion Services concern the production of profile shapes in metal, plastic, and rubber. Such profiles are used in a range of applications from partition frames to automotive door seals.
Plastic and rubber extrusions are manufactured using modified injection molding technology. Instead of making discrete parts in molds, the injector screws force molten material through dies to produce continuous lengths of solid or hollow profiles. Metal extrusions similarly use pressure and sometimes heat to force metal through dies, producing often complex profiles. Another metal extrusion process is used to make aluminum tubes and similar hollow products.
Because of the tooling involved, extrusion is considered economical only for moderate to high production volumes. Many extrusion services will stock a range of shapes that in many instances will be close enough to a custom shape that making a special die can be circumvented. It depends on the flexibility of the extrusion designer to decide if a stock profile will work.
Many extrusion services will provide die designing and building as a part of their services.
Metal Extrusion employs both hot and cold methods to extrude aluminum profiles, toothpaste tubes, etc.
Plastic Extrusion produces solid and hollow products such as PVC pipe from melted plastic pellets.
Rubber Extrusion produces rubber profiles such as door edgings and profiles.