Vacuum Technology for Handling Special Glass and Display Glass

The market for displays is undergoing rapid growth. Not only are the displays getting larger and larger with an increasing number of integrated functions, but also the requirements for vacuum technology are increasing steadily. The glass is getting thinner and the coatings more complex and sensitive. From processing after raw material production, to cutting, grinding, coating and the various assembly processes, the output quantities are constantly increased. This leads to high requirements not only for a gentle, mark free handling, but also high acceleration rates and high positioning accuracy.

In addition, the requirements regarding ESD-compliant handling in the field of display assembly and display module production are becoming increasingly important. An uncontrolled and fast discharge can lead to irreversible damage to the displays or the electronic components installed.

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Schmalz GmbH
Commerz Park West 1
4061 Pasching

T: +43 7229 24 24 4
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Requirements for Vacuum Technology

Highforces and maximum acceleration rates
These handling processes require minimal cycle times. The glass also has to be gripped quickly and then handled safely and precisely with high acceleration rates. Schmalz’ specially designed thin glass gripper STGG has a large suction area to absorb high shear forces for fast, highly precise handling of glass.

Gentle, contamination-free handling
Any contamination of the glass – before or after the coating – significantly affects the functionality of the displays. For this reason, the grippers STGG are equipped with a contact surface made of contamination-free PEEK. The large suction area of the grippers enables a high suction force to be generated with low vacuum levels. This allows handling with low surface pressure. In addition, Schmalz offers a broad range of suction cups made oft he markless material HT1, that leaves no visiblemarks. The inner support structure oft he suction area of the suction cups SGPN makes it ideal for thin glass.

System availability and low energy costs
These handling processes require short cycle times. The compact ejectors SCPSi and SCPM offer an integrated suction and blow-off function. This minimizes suction and release times, as well as energy consumption. The integrated automatic air-saving function means that the ejector is only activated when vacuum is needed. In addition, the intelligent compact ejector features an IO-Link interface for reading out process data and configuring the ejector. The small size of the ejector allows it to be positioned close to the suction cup for minimal evacuation times.

Flexible handling in assembly processes
The large-area gripping systems FXP/FMP grip a large area of the glass. This generates only a low local surface pressure so that even sensitive coatings or imprints can be handled without damage. An optionally available protective coating minimizes contamination. The integrated valve technology means that the grippers can handle even workpieces that are smaller than they are, allowing different glass workpieces to be gripped flexibly. The gripper FXP also offers an integrated vacuum generator based on the Venturi priciple.

Low-contact handling
By taking advantage of the Bernoulli principle, SBS floating suction cups allow you to handle workpieces with very little contact. The suction cup floats on an air cushion, and horizontal forces can be transmitted by means of an elastomer buffer made of HT1. High flow rates combined with low vacuum permit gentle handling and long-range effectiveness for safe separation of glass sheets.

ESD compliant handling
Suction pads made of the ESD-compliant material NBR-ESD have a resistance range of 106 to 109 Ω and are also free of conductive soot. This means that the suction pads made of the yellow material NBR-ESD not only provide a defined leakage resistance, but also prevent damage to components due to soot. In combination with the spring plungers FSTIm and FSTImc, the suction pads offer reliable point-to-point and point-to-ground resistance in the ESD range.

Vacuum Technology for the Special Glass and Display Glass Sector