Foods and beverages: apparatus – Cooking – Boiler or deep fat fryer type
Patent
1997-11-14
1999-02-02
Simone, Timothy F.
Foods and beverages: apparatus
Cooking
Boiler or deep fat fryer type
99330, 99403, 210167, 210DIG8, A23L 101, A23L 1217, A47J 3712
Patent
active
058651020
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
TECHNICAL FIELD OF THE INVENTION
This invention concerns a deep-frying apparatus for such products as may easily adhere to one another when fried, primarily potato products, such as crisps.
PRIOR ART
A known deep-frying apparatus intended for this purpose comprises an elongate deep-frying pan having a plurality of bottom inlets and bottom outlets for the frying oil. Each of the bottom inlets and outlets extends essentially over the entire width of the deep-frying pan. The inlets and outlets are distributed along the length of the deep-frying pan in order to cause the frying oil to flow in the longitudinal direction of the deep-frying pan, from an inlet end towards an outlet end for the products to be fried.
The deep-frying apparatus further comprises a filter, a circulation pump and a heat exchanger, which are connected in series from a first collection pipe, which is connected to the bottom outlets, to a second collection pipe, which is connected to the bottom inlets.
If this deep-frying apparatus is used for frying e.g. thin potato slices immediately after these have been produced by the slicing of potato, especially unpeeled and unwashed potato, the potato slices will to a large extent stick together. In small-scale production, this may largely be prevented by manual agitation of the frying oil in which the potato slices are immersed. In large-scale production, however, it has previously been necessary to pretreat the newly-cut potato slices by e.g. rinsing them in water and then optionally drying them, before the thus-treated potato slices may be deep-fried with any success, i.e. without sticking together.
OBJECT AND SUMMARY OF THE INVENTION
The object of this invention is to provide a deep-frying apparatus enabling in particular potato slices to be deep-fried immediately after production.
According to the invention, at least one pair of opposing lateral inlets should be arranged in opposing side walls of the deep-frying pan and be provided opposite to one another in an area closest to the inlet end, at least two of the bottom inlets being arranged in this area. Via a third collection pipe, the lateral inlets should be connected to the circulation pump, such that oil jets having a velocity of flow much exceeding that of the frying oil flowing in the longitudinal direction of the deep-frying pan are directed against one another essentially transversely of said longitudinal direction. This enables a turbulent frying-oil flow, which is essentially symmetrical with respect to a centre line in the longitudinal direction of the deep-frying pan and has proved to be effective in preventing from sticking together such products as would otherwise easily come to do so when fried.
In order to impart a sufficient velocity of flow to the oil jets directed against one another essentially transversely of the longitudinal direction of the deep-frying pan, the third collection pipe may be connected to the circulation pump via a pressure-increasing pump.
A preferred velocity of flow for the oil jets directed transversely of the longitudinal direction of the deep-frying pan is in the range of 5-20 m/s, preferably in the range of 8-15 m/s, and most preferred in the range of 10-14 m/s, while at the same time the velocity of flow of the frying oil flowing in the longitudinal direction of the deep-frying pan suitably is in the range of 0.05-0.5 m/s, preferably in the range of 0.1-0.3 m/s, and most preferred in the range of 0.15-0.25 m/s.
In order to prevent even more effectively the products to be fried from sticking together, the oil jets having the higher velocity of flow may be given another temperature than the frying oil flowing in the longitudinal direction in the deep-frying pan, suitably a lower temperature. According to the invention, this is achieved by the pressure-increasing pump being connected to the circulation pump either directly only or both directly and via the heat exchanger. However, the pressure-increasing pump may also be connected to the circulation pump via the he
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Bengtsson Jan
Haraldsson Roland
Potato Processing Machinery AB
Simone Timothy F.
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