Krones
Steinecker Variomill und PowermillFlexible milling for every malt quality
Excellent milling characteristics for high extract yield
The foundation stone for best beer quality and process efficiency in the brewhouse is laid with milling. The requirement is for complete endosperm comminution with protection at the same time of the well steeped husk. To do this, the mill has to be adjusted exactly to the particular ground stock. The ideal situation is when the mill can adjust to changes in malt qualities. This is precisely the flexibility being offered by the Steinecker Variomill family whereby both the soft-water temperature and quantity, the steeping time and the milling gap can all be adjusted by variations in the recipe. Variomill furthermore unites the advantages of wet milling and dry milling.
Variomill technology will always guarantee these excellent milling features for malt and raw grain – and this means better extract yields at the highest level as well as perfect lautering results. For any size of operation: This is because with its double-roller models – V5, V10, V16, V20 – and the 4-roller model the V25, the Variomill family covers the whole range from small to medium-sized breweries and all the way through to the very large operations.
Variomill und Powermill – Your benefitsClose
High yield
Irrespective of the grinding stock an excellent yield is attained thanks to the variable milling gap (only for Variomill), the steeping times and steeping temperatures. The husks have been conditioned to an optimum and are highly elastic. Thus the best pre-requisites have been provided for the lautering results and lautering rates. Compared to dry-milling, the charge for the lauter tun can be increased by as much as one third.
Output range
Long service lives in the output range of 25 t/h are attained by an additional pair of rollers.
Efficient design
All mills are fully CIP-able, no acid is needed for CIP cleaning. The compactness of the construction designed for confined space is an eye-catcher. Furthermore, no explosion protection measures are necessary.
Gentle milling
Low-oxygen and homogenous mashes develop as early as during mashing in. The husks are always conditioned to an optimum. This means the best lautering results and lautering rates.
Variomill – Figures, data, factsClose
The V5 is one of the two-roller models in the Variomill family.
Design features
5 models for milling outputs from 5 t/h to 25 t/h
Type-specific version, with 2 or 4 rollers
All milling gaps from 0.20 to 1.2 mm individually adjustable from the servodrive electronics
Variably adjustable steeping time and steeping temperatures for the finest soft-water distribution
Malt mass flow in the milling gap kept constant by the milling speed control system
Homogeneous feed over the sieve guide plates
Compact milling system with continuous steeping device with integrated mash pump
Variomill – Innovative technology from the steep to the mashClose
Variable steeping time
The variable steeping time is controlled in the continuous steeping device by ongoing measurements of the level to regulate the speed of the upper feed rollers. With this steeping time control system, the degree of steeping can always be adjusted precisely to the ground stock. The husks thereby develop the desired high elasticity and yet the endosperm remains dry – the best pre-requisites for very good milling and optimum grist quality.
Constant mass flow in the milling gap
Together with the sieve guide plate, the milling controller ensures that the malt mass flowing to the milling gap remains homogeneous. Even the fluctuations in the feed due to the malt quality will be reliably compensated. It is thus possible in this way to realise both perfect endosperm milling and gentle handling of the husk at the same time. The results are high extract yields, premium lautering results and short lautering times.
The way from steeping to milling
Milling gap adjustable from 0.20 to 1.2 mm
Each milling gap can be adjusted electronically from 0.20 to 1.2 mm from the servodrive. Control of this is at the automation level. The ideal milling gap – regardless of whether this is for wheat, barley, rye, triticale, spelt malt, or raw grain types – is stored separately for each by recipe management in the brewhouse control system. This means that for a standard brewing operation, the milling gap can be individually adjusted for each recipe.
The homogeneous malt feed to the pinch rollers contributes to perfect milling of the endosperm.
Pinch roller with sieve guide plate. The sieve guide plate ensures that the malt mass flowing to the milling gap remains homogeneous.
Variomill – Method of operationClose
Method of operation
The Variomill is of a very compact design. The mash pump is fully integrated. The combination with the upstream worm inducer means that a very low overall height can be realised. Together with the inducer, the flow-optimised centrifugal pump assures the gentle low-output conveyance at the same time even for high-gravity mashing (mixing ratio during milling up to 1:2.2). No maintenance-intensive monopump is needed for conveying the mash. Compared to dry-milling, the mash is already homogeneously mixed and of low oxygen content at this stage of the process step.
Together with the malt feed over the sieve guide plate, this robust construction with state-of-the-art drive and control technology minimises the wear. This means the maintenance intervals can be extended significantly. The large hinged doors ensure unimpeded access to all areas at drive and pump level.
A special mounting crane is available as an accessory for quick roller exchange. It can be mounted to the mill in just a few steps. This means the rollers can be mounted easily and safely even when the space is limited.
Variomill – Technical dataClose
The four-roller steinecker Variomill V25 is the ideal answer for up to 12,500 kg of malt grist. The milling output can be as high as 25 t/h.
With the V25, both milling gaps can be adjusted electronically and independently from one other. The first pair of rollers with the wider milling gap pre-mills the compact malt flows with gentle husk treatment. Milling to completion is by the second pair of rollers with the smaller milling gap located underneath the pre-milling rollers. The results are the highest extract yields and the husk quality regardless of the ground stock – for a milling output of 25 t/h. In short: The V25 is the perfect mill for the larger breweries where raw barley is used as well as malt.
Two pairs of rollers do of course mean that the wear on the bottom rollers is significantly less. Not only does the Variomill V25 with four rollers offer flexibility and performance, it also means a lasting reduction in maintenance costs thanks to the longer intervals for roller replacement.
Technical data for the Variomill/Powermill
Performance data (at maximum milling output)
Variomill type V5 V10 V16 V20 V25 Powermill
Milling output, malt* t/h 5 10 16 20 25 40
Number of milling rollers Pcs. 2 2 2 2 4 2
Roller length Mm 600 1.000 1.200 1.200 1.200 2.000
Installed motor power kW 21 41 55 74 74 115
Total weight kg 1.600 3.000 5.650 5.650 8.650 10.190
Total height (mill + steep) Mm 3.160 3.275 3.660 3.660 4.345 4.640
The following values are standard values and can differ according to the particular equipment. A water pressure of 3 bar shall be ensured.
Softwater up to 65°C hl/h 20-40 40-80 65-130 80-160 100-200 160-300
0,4 – 0,8 hl/100 kg malt
Mash water up to 62°C
und 2,2 hl/100 kg malt
hl/h 65-125 135-255 220-410 270-500 340-550 540-1.000
* approx. ± 5 % deviation depending on the malt quality
Acceptance result
Official acceptance results for a Variomill V25
Settings
Output t/h 25
Distance between rollers for the upper pair mm 1,20
Distance between rollers for the lower pair mm 0,55
Mill-dependent quality parameters
Degradable extract of the spent grains % 0,7*
Photometric iodine value in the wort 0,3*
Lauter tun, total action time h 2
Lautering time with turbidity < 20 EBC % 75
* EBC analysis method
Powermill – Supremency in the high-performance segment
Large grist volumes and rapid brewing sequences are no problem for the Powermill from steinecker With a milling output of 40 t/h, the power-regulated mill unites all the benefits of wet and dry milling in one system. It guarantees gentle milling, minimum roller wear, best lautering results and rates even for high false bottom loads, as well as low-oxygen mashes. The Powermill thus provides the best pre-requisites for optimum beer quality.
The Powermill is not just an eyecatcher because of the technology: Because of the compact construction, there is greater flexibility to set it up than is the case with dry milling systems, and less space is needed. It is fully CIP-able.
A further advantage of the Powermill family is that no explosion protection measures are required for the mill itself. All personal protection devices have already been integrated. And: The Powermill needs less electrical power than two 20-ton mills.
Powermill – Design features
The wealth of technical innovations means the Powermill has the perfect technology for milling:
The design for the new type of continuous steeping device has been matched exactly to the flow behaviour of malt. The foundations have thus been laid here for the user-defined steep time.
Roller geometry – the rollers have been designed to be very long for a large diameter – this is unique the world over. The advantages of such a large roller surface are decisive for the user and include better intake of the ground stock, high-efficiency milling, optimum protection of the husk, as well as longer running times for the rollers and hence higher operational reliability.
The 2 mash pumps are fully integrated. The combination with the upstream worm inducer means that an extremely low overall height can be realised. The flowoptimised centrifugal wheel pumps mit inducer technology conveyor even the high-concentration mashes in a gentle and energy-saving manner.
The advantages of using large roller diameters
Better intake
Long contact time
Gentle on the rollers
Less wear
Longer running times
Increased operational reliability
The advantages of using longer rollers:
Higher throughout rates