Internal Mixers Non-Intermeshing Rotors

Banbury was led by the considerations of the previous paragraph to invent a new type of batch mixer, one containing a ram [ 1 to 4,19 ]. His experiments with Werner und Pfleiderer customers indicated that the ram both improved mixing and prevented the poisonous vapors from escaping. He prepared a patent application and submitted it to Werner imd Pfleiderer management. They did not file the application. 

At this time Werner und Pfleiderer was in great difficulties brought on by World War I. Contact with Stuttgart was now difficult [18]. The British government stepped into the operation of Werner, Pfleiderer, and Perkins. The USA was about to enter the war on the British side. This would subsequently lead to their seizure of Werner imd Pfleiderer and their Saginaw 

Banbury s first patent [20] was issued in November 1916(Fig.9.5).Henowsetouttodesigna totally new internal mixer for the industry. He also set out to develop a comprehensive system of patents to protect his new mixer system and the Birmingham hon Foundry. These were filed beginning in the fall of 1916 and began to issue in mid 1917 [21 to 24]. 

After World War I, the English baking machinery manufacturer Joseph Baker and Sons took over Werner, Pfleiderer, and Perkins (which had been renamed Perkins Engineers). The new firm was called Baker Perkins [17]. Baker Perkins purchased the Werner-Pfleiderer firm in the USA including the Saginaw facility. They did not challenge Banbury s key patent or manufacture internal mixers for rubber compounding. 

Werner und Pfleiderer GmbH reacted with shock to the new situation. Having lost through the war two-thirds of their company facilities, they had to borrow money from Baker Perkins to survive. They did not introduce rams into their internal mixers until the late 1930s [1]. 

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