The Extrusoregal is a shelving system made of extruded WPC hollow chamber profiles. (Picture courtesy of mehrwerk designlabor.) Injection moulding can be used, for example, to produce upholstery backings for office chairs (left picture) or for terrace flooring (right). (Picture courtesy of Werzalit.)

With the introduction of thermoplastics, the first commercial application of wood polymer composite (WPC) appeared in the mid-1950s, with the production of a wooden flooring tile made of PVC and wood flour. The most common technologies for producing WPCs today are extrusion and injection moulding, although some

The grain size of the flour varies according to the type of article in production: finer flour makes the compound more fluid and therefore particularly suitable for injection moulding even when the item in question has very thin walls (up to 3 millimetres). Generally speaking this type of WPC has a high flow

The sandwich injection molding process can improve this situation by eliminating the negative properties of WPC by enclosing it with a pure polymer. In this case, a layered structure of skin and core material is produced, wherein the core component is completely enclosed by the skin component. The suitability of WPC as

WPC, including wood filler treatment, the role of coupling agents and compounding. It describes the machinery used for producing WPC, and gives a introduction to mold manufacturing. The use of WPC as an alternative to pure thermoplastics in injection molding processes is discussed. Furthermore it is described how