At the end of 2018, LiSEC presented its VSL-A horizontal cutting system — a basis for successful processing of laminated glass. Since market introduction, numerous customers have been inspired by its considerable increase in output, patented SIR film heater, significantly reduced glass waste, and less operator intervention due to increased automation.

To provide solutions that best meet customers’ individual needs, LiSEC has developed a modular laminated glass cutting system solution that can be adapted and expanded step by step as required. At the final expansion stage, two VSL-A stations can be combined consecutively to cut glass to size on the second VSL-A Tandem. Together with intelligent Dynamic Load Balancing, output of up to approx. 140 units of fully cut sheets can be achieved per hour. In keeping with the motto, “If you stop getting better, you stop being good” (P. Rosenthal), over the past two years, extensive development has been done to the VSL-A’s production control logic and engineering. Daniel Schörghuber, product manager for the glass cutting department at LiSEC, introduces future solutions for almost completely automatic cutting of laminated glass with high output and perfect cut quality.

MR SCHÖRGHUBER, WHAT IS LISEC DEVELOPMENT FOCUSING ON? 

Daniel Schörghuber: In developing VSL-A cutting technology, we’ve taken into account the growing portion of laminated glass, especially at companies processing insulating glass. This allows higher output in less time with reduced waste. Moreover, in the past two years, in a great deal of project planning, we and our customers have assessed their production data, analysed the situations in the production facilities, and have come to the following result: A glass storehouse usually supplies at most two to three cutting lines. Generally, there is no space for expansion width-wise without structural adaptations to the production hall. With the necessary increase in automation together with continuously high quality regardless of the raw glass quality, LiSEC’s new system solution meets market demand at a time when labour is tight. The VSL-A system solutions are the next step toward fully automatic systems. The laminated glass cutting capacity is increased by a modular concept based on VSL-A technology. 

HOW IS THE MODULAR DESIGN STRUCTURED? 

Daniel Schörghuber: It all starts with automatic glass storage in combination with a system for edge deletion or removal of the LSG film overhang, and with the first VSL-A cut with conveyor belts. Then, depending on the production quantity and variety, users can choose between two different variants. Customer Type A, who has a lot of variation in the product mix (X-Y-Z cuts) can already reach output of approx. 75 sheets an hour with an additional VSL-A station without Tandem, downstream from the first VSL-A station in line — and it’s all completely automatic. Here optimal dynamic use of the two VSL-A system solutions plays a major roller. Moreover, new operating modes have been developed and can be switched between at any time: Sport and comfort mode. When comfort mode is selected, the system continuously produces fully cut glass sheets on the conveyor belt, with almost no human intervention. Sport mode can provide additional production capacity. Here the operator assists the station, especially in separating scraps, which again makes for higher output, a special advantage during production peaks. Customer Type B, who often produces identical products (X-Y cuts), can expect a count of approx. 140 sheets per hour with a VSL-A station in Tandem design. In Tandem mode, two simultaneous sheets can be cut on the second VSL-A, automatically. This solution far exceeds all previous output numbers and represents the fastest LSG cutting system on the market, especially for series formats. 

HOW DOES THE DYNAMIC LOAD PLANNING WORK? 

Daniel Schörghuber: When developing two consecutive VSL-A laminated glass cutting bridges, it was especially important to us to load them intelligently and as well as possible to maximize output and reduce waste. We achieved that through mutual dynamic production control, which — depending on the specific optimization — dynamically distributes the processes on thee individual laminated glass cutting bridges. This Dynamic Load Balancing (DLB) loads the bridges in the best way possible. It reduces throughput time for each optimization and increases the hourly output of completed units.

What advantages do two consecutively arranged VSL-A laminated glass cutting bridges offer? Daniel Schörghuber: The VSL-A cutting bridges have very high mechanical stability and therefore form the basis for consistent, precise cutting results. The first VSL-A station optionally makes the front edge cut to at least 20 mm and automatically disposes of it into a container. Then follows the X sub-plate cut, which is precisely rotated 90° by the VSL-A with its integrated rotation function and without operator intervention. The Y scrap at the trailing edge of the sub-plate is automatically removed and disposed of. The sub-plates prepared on the first VSL-A station are then further processed at the VSL-A bridge. Depending on the dynamic load plan, the first station can also make Y cuts. In the next step, the Y and Z cuts are done, and the scraps are removed without operator intervention. Then follows automatic outfeed and either removal of the finished products by an operator or automatic transfer to a downstream sorting system.

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