Tampon printing

Tampon printing is indirect, using a resilient silicone tampon to transfer printing ink from a block to a substrate. In MID engineering tbe process is used to print insulating surfaces, solder stoplines, or the primer coats described above. 

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In thick-film technology (layer thickness > 1 pm), roll or tampon printing methods well known in the porcelain industry are suitable for applying layers of defined geometry on the green ceramic. The thickness is controlled by precise adjustment of the paste viscosity and solid content. To provide an adequate three-phase boundary, zirconia is added to the platinum to form a cermet (ceramic-metal compound). 

Primer and tampon printing are alternative structuring methods currently used in MID production along with the plasma technologies, which are discussed in more detail in Section 3.3 below. 

Primer technology offers a raft of options for structuring three-dimensional interconnect devices. One possibility is to shape silk-screen printed films and then stabilize them by film insert molding (Section 3.1.3.1). Another option is to use tampon printing to transfer a circuit layout directly to a three-dimensional plastic body. 

Overprinting is usually carried out with one or other of the following printing processes hot foil stamping, flexographic, letterpress, tampon, thermal printing, and stamp debossing. 

Gravure printing employs an intaglio process whereby the print area lies below the surface of the plate in small cells. The tone or colour depth may rely on the depth of etch (i.e. amount of ink which lies in the cells) and/or the number of cells per linear inch. All gravure is basically half tone (solid line gravure plates are used in some tampon or cliche processes). 

In screen printing and pad printing, untreated static electricity can result in image spider and webbing, dirt and dust on the product, tampon or screen, and shocks to your people. 

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