In order to meet the rising demand for packaged water, filling companies need appropriate machine speeds. Contrary to commonly held opinion, a single larger line offers better performance in terms of both energy and media consumption per packaged unit than multiple medium-output lines. Krones’ response to this development is the world’s first wet-end block achieving an output of 100,000 0.5-liter water bottles per hour – thus establishing a new benchmark in block technology.
With the development of the 100,000-bph ErgoBloc L, Krones has set a new standard in block technology. The US-based beverage maker Niagara Bottling, LLC is the first company in the world to put this groundbreaking filling technology into operation. We spoke with Niagara Bottling to learn why the company chose the 100,000-bph ErgoBloc L.
The basic production sequence of this 100,000-bph block is just the same as in a conventional ErgoBloc L. But a closer look at the individual machines reveals some key differences. The filler posed the biggest challenge for the development team because there are physical limits to the standard approach of “bigger carousel equals higher output”. At some point, the masses to be moved and the forces acting on them simply get too big to reliably maintain a stable process. In order to prevent this, the block features two modularized filling units and two modularized closing units.
Two filling units, two closing units – but only one machine
That may sound simple, but was in fact difficult to implement because although the filling/closing of 100,000 bottles per hour is evenly distributed among two units each, these units are still constituent parts of a single integrated block with just one valve rack and one sorting system for closures. The Modulfill Dual features around 60 filling valves fewer than a one-filler solution would need for the same output. Thanks to its compact size, the filler takes up less space, but its output is still almost 20 percent higher.
And Krones has packed even more innovations into the high-speed block: For example, some components from the fourth Contiform generation are used in this high-performance block, such as the newly developed skip-and-run technology, which monitors the mold-hanger locking device and allows a blowing station that is not locked to pass along the main cam, for instance to eject a defective preform without triggering an emergency stop of the entire machine. That considerably reduces the scrap rate and eliminates the need for operator intervention.
In addition, Krones has developed Contiloop AI, an automatic process control system, and put it to use in the new Contiform: The combination of AI-based software and newly developed hardware makes it possible to detect even the slightest variations in material distribution in the production of PET containers and to automatically adjust key stretch-blow-molding parameters in real time – and thus to ensure that bottle quality meets specifications. This factor is particularly important when working with rPET.
The link between stretch blow-molder and filler: the Ergomodul
In developing the stretch blow-molder, Krones focused on enabling operation that is eco-friendly, sustainable and at the same time cost effective. By shortening the distance between the heaters, they’ve made the heating space even more compact overall and redesigned the heaters with parabolic reflectors. As a result, they’ve cut energy consumption by 11 percent compared to the previous generation. The team has also achieved substantial savings on compressed air. Unlike the technology customary on the market to date, the new Air Wizard Triple air recycling system uses a three-stage compressed-air recycling process that can reduce compressed air consumption by as much as 20 percent.
To cope with the very high output of the stretch blow-molder, some additional, optimized components, functionalities and assemblies were incorporated in the Ergomodul. For example, the two Contiroll labeling stations and the Multireel magazines for label reels feature a new buffer system which keeps the label tension at a constant level, thus offering ideal preconditions for thin label films, a boon for sustainability.
Another of the machine’s key features is the “no bottle – no label” function. If a service rejection in the blow-molder causes a gap in the bottle flow entering the labeler, no label is transferred to the vacuum cylinder and the corresponding vacuum cylinder suction bars are retracted upon reaching the gluing unit. As a result, no label or glue is wasted and any gaps in the container flow no longer affect the efficiency of the line.
Read the interview with Niagara on the next page.