The M2H semi-automatic screen printer has been designed for printing of ceramic hybrids in applications with small to medium size production volumes, R&D and laboratory as well as prototyping purposes.

But also a large variety of other flexible and rigid substrates up to a size of 180 x 160 mm can be processed on the M2H. The substrates can be placed on to different types of print nests mounted on the horizontally moving table. For a convenient substrate alignment, the printer can optionally be equipped with the manual optical positioning system MOPS. The substrate is then manually aligned using high resolution cameras for reliable recognition of fiducials or other layout features.

The easy to use Microsoft Windows based software allows for storage of all process relevant data. This process relevant data can easily be recalled again for quickest product changeovers.

Different squeegee types and materials can be selected according to the printing requirements. For printing of Green Tapes or other kind of flexible foils the so called “porous stone” can be used as print nest.

The 3D screen printing system “XH3D“, a machine type out of EKRA´s unique 3D Printer platform. By using stencil- or screen technology, it generates complex 3D structures on an base plate.

According to the actual printed layer height, the machine adjusts automatically the snap off distance.

Optionally the machine communicates with the patented screen exchange unit. The capacity of the unit allows to store up to 10 screens.

The base plate for the 3D compenent print, can be fixed by vacuum, direct at the movable print table. An optional drying system can be placed beside the machine to cure the actual layer.

Fastest cycle times and High Precision are the key features of the fully automated XH1 screen printer. The XH1 is the high-end solution for printing of ceramic substrates. 

Its design is unique on the market and is based on excellent experience over many decades in the hybrid market.

The overall throughput of the system is in the range of 3,2 s including printing and is not only the result of a short handling time but includes as well the fully automated screen alignment. The extremely easy product changeover can be reduced to about 1 min and can be performed as well by low level instructed operators.

The alignment of the substrate is performed via the EKRA patented edge recognition. Therefore 3 cameras (alternatively 5) are mounted underneath the print nest and lookup to the substrate edges through sapphire glass modules. The light sources are as well incorporated in the sapphire glass modules. The coordinates of the recognized substrate edges are stored and according to this coordinates the screen is adjusted with a alignment repeatability of ± 12,5µm @ 6 Sigma.

The XH2 screen and stencil print system has been specially developed for printing hybrids, with a particular emphasis on combining highest precision with maximum flexibility. This inline print system utilizes the patented EVA™ –EKRA Vision Alignment System. The EVA™system is an optical positioning system with a free-moving camera. Both the camera axis and the screen adjustment assembly have integrated high precision measuring systems which together ensure a repeatability of ± 12,5µm@ 6 Sigma.

To ensure the highest possible flexibility, different methods of substrate position detection can be selected for the camera system. For substrates with polished surfaces, an edge detection system is selected and if structures such as fiducials, holes, or print images are to be used for positioning, then fiducial recognition can be selected. This versatile camera system even has the capability to position the substrate using synthetic fiducials, a method which minimizes tolerances created by previous process steps.

A particular advantage of this print system is that no mechanical centering is required, allowing stress-free processing of the fragile substrates.

Thanks to the closed-loop adjustment of both print heads, the programmed squeegee pressure remains constant throughout the entire printing path, independent of the substrate properties and the print parameters. Depending on the required print-process, a number different squeegee profiles can be selected.

The flexible machining cell is designed for front or back side printing (bumping or wafer backside coating) on round wafers. The system consists of two main modules, a loading unit and a printing system. The loading unit in turn consists of three components: a magazine unloading system, a robot unit and a pre-align station. The magazine unloading system is equipped with two magazine positions from where the wafers are fed to the machine. The 3-axis robot unit with vacuum end effector ensures a stress-free wafer transport. Using a flexible pick-up, different end effectors can be used even for very thin or curved wafers.

After taking a wafer from the magazine, it is placed re-positioned in the built-in pre-align station via flat or notch recognition for subsequent printing. The wafer is then place by the wafer robot into a vacuum printing nest and then lowered and fixed. After transporting the printing table into the printer, the fiducials are detected by the moving camera and the screen or stencil is fine-adjusted.

Printed wafers can now be transported back to a magazine or removed individually with a drawer system. Optionally, processed wafers can also be fed automatically to other machines by a transport system.

Subsequent process steps, such as heat treatment, can optionally be integrated in or on the loading cell. OCR or camera reading systems are available for identification of any text on the wafers or 1D/2D codes. Communication of the cell through the SECS-GEM protocol or connection to custom MES systems is possible as options.

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