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Morton Coutts, father of continuous fermentation

Morton Coutts

Morton Coutts (1904-2004) was the inheritor of a rich brewing tradition dating back to the 19th century. Like his father, W. Joseph Coutts and grandfather, Joseph Friedrich Kühtze, Morton Coutts was more an innovator and scientific brewer than a businessman. He was foundation head brewer of Dominion Breweries Ltd under (Sir) Henry Kelliher and became a director of the company after his father's death in 1946. He and Kelliher formed a formidable team-Coutts, the boffin-like heir to a rich brewing heritage, obsessed with quality control and production innovation, and Kelliher, a confident, entrepreneurial businessman, able to hold his own with politicians and competitors.

Morton Coutts' plan for continuous fermentation at Dominion Breweries' Waitemata Brewery. This process was patented as a world first in 1956.


Morton Coutts Journal

Morton Coutts' most important contribution was the development in the 1950s of the system of continuous fermentation, patented in 1956, to give greater beer consistency and product control. The continuous fermentation process was so named because it allows a continuous flow of ingredients in the brewing, eliminating variables to produce the ideal beer continuously. The system achieved this by scrapping open vats-the weak link in the old system-and replacing them with enclosed sealed tanks. Continuous fermentation allows the brew to flow from tank to tank, fermenting under pressure, and never coming into contact with the atmosphere, even when bottled. Coutts' research showed that his process could produce consistent, more palatable beer with a longer shelf life than under batch brewing. A London newspaper described it as a "brewer's dream and yours too". Coutts patented the process, and subsequently the patent rights were sold worldwide as other brewers recognised the inherent benefits of continuous processes. Although many attempted to implement the technology, most failed due to their inability to apply the rigorous hygiene techniques developed and applied by Coutts. Eventually, in 1983, Coutts' contribution to the industry was honoured in New Zealand.


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