Hancock’s ‘Pickle

Figure 3.6 Hancock s Pickle. AA,F, wooden body B, stationary pins ...

For anyone interested in the history of internal mixers, the article by J.L. White, written in 1992 (356), is still one of the best-researched reviews of the development of rubber mixing machinery from the days of Hancock s Pickle to the end of the 1980s. 

The earliest blends developed that we discussed in Section 1.1 were prepared in batch mixers, notably T. Hancock s (1820-1838) masticator (or Pickle [6,28]) or Chaffee s (1836) two roll mill [5]. The two roll mill was widely manufactured by machinery companies in the USA and Europe. It became the primary method of preparing compounds in the (natural) rubber industry well into the second decade of the twentieth century [29, 30]. 

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