![]() Their flexibility inspired the redesign of common objects, for example the invention of the snap joint, an assembly method for interlocking components. Plastics perform in ways not found in traditional materials enabling new design, fabrication and function solutions. Plastics can be any shade or tone with the result that the same product can be manufactured in different colours and a single product can have a range of hues, can also be transparent and translucent. Like traditional materials they can be painted but colouring can also be, and often is, integral to the manufacturing process. This machine also allowed material to be mixed before injection, so that coloured or recycled plastic could be added to virgin material and mixed thoroughly before being injected. In 1946, American inventor James Watson Hendry built the first screw injection machine, which allowed more control over the speed and quality of the injection. ![]() The first synthetic polymer was invented in the 1860s and over the last 100 years plastics have saturated our world, changed the way that we live and plastic design has evolved with technology.
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