Effectiveness of screw press

In the late 60s, Taunton Cider used such a press for a while under trial from SPEICHIM, a French food industry machinery company, and to provide a first stage of juice extraction before the then conventional pack presses. 

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As Claude has said, such screw presses were expensive machines.  They closely resemble the much cheaper steel and cast-iron Colin press used in France at the same period (perhaps still?) as a first stage in finally dewatering spent pomace after a 2nd or 3rd extraction of juice, often (then, perhaps) with the addition of water.  The pomace at about 60/65 %w.w. moisture content would then be dried for sale as a base for pectin extraction and some other purposes.  The high and ever-rising cost of fuel has since more or less put paid to that usage.

From memory, the Taunton experience of the SPEICHIM press was of periods of excessive slippage between the fruit mass and the internal screw and the enclosing screen.  This was attributed to the presence of moderate to high levels of pectin in the fruit when slippage occurred and the practical result was that the pomace was churned by the action of the screw and did not move through the machine.

Generally speaking, cider apples (bitter-sweets/sharps, etc) with their more ‘fibrous’ texture pressed satisfactorily since they tended not to churn and I suppose the almost exclusive use of cider fruit in the main cider regions may have led to the system’s adoption among cider makers in France.  The need in the UK to be able to press non-cider apple varieties meant that the machine was returned to SPEICHIM after about 3 seasons.  The highly effective Bucher-Guyer rotating press that was introduced at about the same time was then enthusiastically adopted across the world – in spite of its even much higher cost......

The screw system should work and ways could be found to make it work but at the cost of process complication – which could be more or less ignored with the Bucher 5000 and its descendants.

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Hope this reminiscence helps.

Nick

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