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Design and Development of a New Press for Grape Marc

1
Department of Agricultural Science, University of Naples “Federico II”, Via Università 100, Portici, 80045 Naples, Italy
2
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II, 132, 84084 Fisciano SA, Italy
*
Author to whom correspondence should be addressed.
Machines 2019, 7(3), 51; https://doi.org/10.3390/machines7030051
Received: 29 April 2019 / Revised: 10 June 2019 / Accepted: 24 June 2019 / Published: 9 July 2019
The purpose of this research was to determine the optimal geometry of a variable pitch conical helicoid to be used in a pressing machine for grape pomace, also known as grape marc. This study attempted to understand if the optimized geometry of the considered helicoid after every pitch resulted in volume decrease DVc, equal to that obtained during the pressing phase of grape pomace DVp, using an optimized membrane press. The conical helicoid with variable pitch was replaced in a machine that offered continuous pressing of grape pomace using a cylindrical helicoid with constant pitch (constant pressure distribution, not optimized, along the cochlea axis). As this was a machine already available in the market, the overall dimensions were already established—5.95 m in length and 1.5 m in width. The pressure distribution p1 and volume change DVp, obtained during the grape pomace pressing phase in the optimized membrane press (producing high-quality wine) was taken into consideration in this research. Furthermore, the optimized pressure distribution p1 was applied in seven phases during the pressing process, and a consequent volume change value DVp was obtained for each phase. Therefore, this study determined the geometry of the variable pitch conical helicoid, which, after every pitch, resulted in volume changing DVc that was similar to the volume changing DVp obtained by the optimized membrane press. For this scope, calculations were realized using the Mathematica 10 program code, which, on being assigned the overall dimensions, slope angle of the helicoid, and volume for the first pitch value, determined the radius and pitch values of the helicoid, total volume, and volume change DVc. It was also noted that by appropriately varying the geometric parameters (taper and pitch of the helicoid), different options of pressure distribution on grape pomace can be obtained, thus enabling improvement and optimization of product quality. View Full-Text
Keywords: grape pomace pressing; continuous press; winemaking process grape pomace pressing; continuous press; winemaking process
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MDPI and ACS Style

Formato, A.; Ianniello, D.; Romano, R.; Pellegrino, A.; Villecco, F. Design and Development of a New Press for Grape Marc. Machines 2019, 7, 51.

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