Rhode Island Patent of the Month – January 2021
Extrusion die systems are used to create objects with fixed cross-sectional profiles. These systems normally work with metals, polymers, ceramics, concrete or even modelling clay. The die itself is a circular steel disk with openings that make the desired shape. The chosen material is pushed through a die in the desired shape. Biomedical and electronic fields (among others) require nano-sized components. Typical extrusion methods are unable to achieve a small enough size. Guill Tool & Engineering Co., Inc developed an extrusion die system capable of producing nano-sized features.
This die system uses a sequence of dies to form multiple flow streams which are extruded through a non-rotating die system. These flow streams are repeatedly compressed, divided and overlapped to increase the number of laminations. Their system allows for extrusion in a variety of shapes including cylindrical. The first die receives the material and extrudes it in a ribbon shape. A second set of die plates receive these streams and further divide them into smaller laminated ribbon shaped flow streams. A third die plate set further divides the streams, laminating and compressing them. These parallel flows are rejoined into a single extrudate with nano-sized features. Guill’s invention could expand the capabilities of numerous fields like biomedical sciences.
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