Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1995-12-01
1998-07-21
Warden, Jill
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 221, 134 253, B08B 704, B08B 900
Patent
active
057829853
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/CH95/00084, filed Apr. 20, 1995.
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a process for cleaning pasta presses, particularly for the cleaning in place of the screws of screw-type machines, kneader mixers and the like in the pasta industry by a treatment with water, lyes and acids.
The present invention relates to an apparatus for carrying out the process.
In the modern pasta industry, moistened doughs are treated with pressing and kneading screws in screw-type machines, in order to build up, with the formation of the dough, a glutinous structure and simultaneously to build up a high pressure for the moulding. Thus EP-B-351423, for example, describes a process and an installation for producing dough for pasta, wherein the installation comprises a double-shaft kneader having two shafts turning in the same direction which are, to a high extent, self-cleaning. A single-shaft press screw is employed for building up the pressing pressure. The double-shaft kneader and the single-shaft machine can be directly connected to each other, in order to prevent both an unwanted pressure build-up in the kneader and contamination due to external influences. However, despite the extensive self-cleaning of the double-shaft kneader, a high expenditure of manual labor is necessary in order to achieve satisfactory cleaning of the single- and double-shaft machines when the product is changed or for preventive cleaning. Dismantling is necessary, with subsequent cleaning (water and cleansing agent) and re-assembly.
Swiss Patent Application No. 1024/93, which has not previously been published, offers a partial approach to the solution of this problem. According to the invention, screws can be automatically ejected from screw-type machines in one stroke, and in a further development the single-shaft screw press is connected to a swivelling double-shaft kneader. Due to the swivelling capability of the double-shaft kneader, cleaning of the latter and of the connection zones to the screw press is possible in principle. However, with the exception of the screw ejection, the manner in which this is to be effected is neither disclosed nor evident.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the above indicated disadvantages of the known prior art and to achieve in situ cleaning of pasta presses or screw-type machines ("clean in place") without dismantling them. According to the process of the invention the cleaning liquid is conducted into screw presses (2) and/or kneader mixers (1) which are closed in liquid-tight manner and is discharged with adhering contaminants. Also according to the invention an apparatus for carrying out this process comprises a tank (7) provided with a filter which is connected to a high-pressure pump (8), wherein the connection between the tank (7) and a screw-type machine to be cleaned is effected by means of lines (6, 10) with the inclusion of the high-pressure pump (8), and the tank (7) is connected to a spray lance (13) by means of a line and the tank (7) is connected to an effluent treatment.
The application of the invention results in an antiseptic cleaning at low cost.
BRIEF DESCRIPTION OF THE DRAWINGS
With the above and other advantages in view, the present invention will become more clearly understood in connection with the detailed description of a preferred embodiment, when considered with the accompanying drawings, of which:
FIG. 1; a flow diagram according to the invention;
FIG. 2; a portion of FIG. 1; and
FIG. 3; an arrangement comprising a screw-type machine and a swivelling kneader mixer (double-shaft kneader).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The cleaning of a kneader mixer 1 in the form of a double-shaft kneader and of a screw press 2 in the form of a single-shaft screw-press, without dismantling, commences, after interruption of their operation, with the swinging out of the kneader mixer 1 (FIG. 3) and sealing the outlet opening 3 by a closure 4. Thereafter, firstly cold water unde
REFERENCES:
patent: 2818076 (1957-12-01), Erling
patent: 5156861 (1992-10-01), Tsuchiya et al.
patent: 5181374 (1993-01-01), Matsuda et al.
patent: 5392797 (1995-02-01), Welch
Patent Abstracts of Japan vol. 18, No. 86 (C-1165) Feb. 14, 1994 & JP,A,05 292 933 (Japan Steel) Nov. 9, 93 (see abstract).
Patent Abstracts of Japan vol. 10, No. 269 (C-372) (2325) Sep. 12, 1986 & JP,A,61 093 820 (Sumitomo) May 12, 1986 see Abstact.
Ebneter Jurg
Manser Josef
Resch Heinz
Seiler Werner
Buhler AG
Chaudhry Saeed
Farber Martin A.
Warden Jill
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