iba 2018: Tweedy SuperCool by Baker Perkins Brings High-Speed Mixing to Every Climate
New technology that makes high-speed mixing possible in hot climates on Tweedy mixing systems will be introduced by Baker Perkins at IBA held from 15-20 September in Munich (Hall A6/321). The Tweedy SuperCool process combines radically enhanced bowl cooling with advanced control technology to provide precise management of dough temperature in any climate.
The Tweedy SuperCool system can be retrofitted to existing installed mixers. The technique features a re-designed cooling system that can significantly increase heat transfer from the dough to the cooling jacket during mixing.
Baker Perkins’ specialist software measures flour and ambient temperature and relates them to energy requirement for the mixing process. It then regulates incoming water temperature and applies jacket cooling to achieve the exact dough temperature required.
This creates complete control over dough temperature, which is fundamental to efficient downstream handling. The target temperature for dough is normally 26 to30°C.
The effectiveness of the system is demonstrated by a reduction in final dough temperature of ‘X’° C on a large batch industrial mixer.
Tweedy SuperCool is suitable for high-output plant bakeries making tin and pan bread, burger buns, rolls, and pizza bases, including the sour dough, liquid sponge and sponge and dough processes.
Tweedy SuperCool enables the cost-effective and proven Tweedy high-speed mixing process to be used in hot climates including the Middle East, Latin America and Asia where effective dough temperature control is a potential problem: mixer bowl cooling is very cost-effective compared to the capital and energy costs of flour cooling equipment and bakery air conditioning.
The ability to closely control final dough temperature regardless of variations in ingredient temperatures and energy levels is a major improvement on the standard Tweedy process. Although bowl cooling has always been an option, it has not been sufficient to avoid measures such as adding ice to the mixing bowl when ambient temperatures are high.
Bakers in any environment can now benefit from the high-speed Tweedy process. All the key features that contribute to precise control of the dough structure and rapid mixing times maximising consistency and quality are retained.
Short mixing times, small batches and dynamic scheduling minimise downstream waste, giveaway and downtime caused by dough gassing. Product costs are kept low by water absorption rates up to 75% and efficient development of the available protein which produces strong dough from lower protein flour.
Automated ingredient feeds and short mixing cycles minimise dead-time, while the design of the bowl and mixing tool - plus the speed of rotation - combine to produce a 3D mixing action that stretches and shears more of the dough for more of the time. The result is rapid structural development, allowing up to 12 batches every hour.
Pressure/vacuum mixing controls the dough texture: applying pressure at the start of mixing helps development by trapping more air in the dough, while applying vacuum towards the end of the cycle controls the size of the bubbles and refines the crumb structure. The proportion of pressure and vacuum applied determines whether the dough texture is fine – for bagels, for example; or open – such as baguettes.
As these proportions are simply altered, it’s easy to switch to a different product. Rapid product changeover is a benefit to every baker, particularly where a variety of products are needed each day. Fast cleaning times, simple maintenance, fully automatic operation and high efficiency through recipe management give the Tweedy a competitive edge compared to other methods of dough production.
The Tweedy high speed mixer has been delivering quality and efficiency benefits to plant bakers of a wide range of products in many parts of the world. The introduction of SuperCool will make these benefits available to many more.
Another element in the Tweedy system, the bowl hoist, has also been upgraded. This is now washdown, with excellent access to all areas for thorough cleaning by hose. Enhanced hygiene means less debris, and any remaining debris is easy to see and remove.