3D Printing Processes - Sheet Lamination

The apparatus for UAM variation of the sheet lamination process has a cylindrical sonotrode to which the material sheet is coiled. The sonotrode is rotated to feed the material sheet onto a building platform. If metal sheets are used as building material they are wielded together before coiling over the sonotrode. Similarly in LOM variation of the process, paper sheets are glued together using an adhesive. The feed material sheet is cut by laser or knife on a layer by layer basis and passed to CNC machining for separating each model/part. Each layer is laser cut and joined to the preceding layer by wielding (in case of UAM) or applying adhesive (in case of LOM). The Laminated Object Manufacturing involves an additional cross hatching process to remove the extra build ups.

Sheet Lamination is a low temperature process and is used for making models for display. The process is quite useful for making visual models speedily at low cost. The process is however not suitable for making structural or functional models. That is why, even for prototyping, sheet lamination process has limited use. The process is usually used for making dummy models for demonstration purpose only.

The Sheet Lamination is definitely the fastest 3D printing process as the laser cutter has just to follow a computer controlled path during the formation of each layer. The process has easy handling and low costs per model. The limitation is that the strength and durability of the model created depends largely on the quality of adhesive (in case of LOM) or finish of the wielding (in case of UAM). The process despite being speedy one often require some post processing to give the model a final look and structure. Sheet lamination is a fusion type process and is deemed to have limited scope of evolution as same is assumed for other fusion type 3D printing processes.

The choice of material to use in sheet lamination process is limited to metal sheets of Stainless steel, Aluminium, Titanium and Copper, plastic sheets and A4 size papers.

The sheet lamination process was first introduced by Helisys, Inc. but it has already ceased the operations. The Helisys products are now developed and supplied by Cubic Technologies. Other companies providing sheet lamination services are Ireland based Mcor Technologies Ltd, Japan's Kira, Inc. and Israel based Solido 3D. Currently, Cubic Technologies is providing SD300 LOM 3D printer at a price of $14,995.

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