In the industrial sector, plastic injection molding and plastic extrusion are used for making different things with different shapes and sizes.Extrusion is a method by which molten plastic or any other material is pushed through a two-dimensional die opening. It then passes through a series of shapes or sizes where the molten form gets the desired shape once it cools here.
The injection molding process is basically based on the molten stamping die method. The injection-molding unit consists of two elements: the injection unit, and the clamping unit. Unlike extrusion, injection molding forms three-dimensional shapes.
1.Extrusion is a method by which molten plastic or any other material is pushed through a two-dimensional die opening.
2.The injection molding process is basically based on the molten progressive stamping die method.
3.In the extrusion method, the finished products have a two-dimensional form which are continuous in length. The extrusion method produces linear shapes.
4.Unlike extrusion, injection molding forms three-dimensional shapes.
5.The injection molding process was first established in the 1930s.
6.It was Joseph Brahman who patented the first extrusion process in 1797. However, the process was fully developed in 1820 after Thomas Burr developed the first hydraulic powered press.
7.The extrusion method helps in creating complex cross-sections.
8.Brittle and hard materials can be formed into any shape using the extrusion method. Moreover, the finished materials have a smooth surface finish when compared to other processes including the injection method.
9.In injection molding there is only minimal waste as the scrap can be recycled again.
For the different products we need,different method should be chosen to make them perfect and save cost. precision plastic injection molding is used wider than extrusion.