Method of washing vehicles

Details Method of washing vehicles Method of washing vehicles

2000-09-13

2002-10-01

El-Arini, Zeinab (Department: 1746)

Cleaning and liquid contact with solids

Processes

Using sequentially applied treating agents

C134S032000, C134S036000, C134S037000, C134S042000

Reexamination Certificate

active

06458215

ABSTRACT:

This is a national stage application of PCT/F199/00076 filed Feb. 3, 1999.
1. Field of the Invention
The method relates to a method of washing vehicles by an automatic vehicle washing apparatus comprising at least means for prewashing and means for actual washing, said means and the vehicle to be washed being arranged to move in relation to each other in the longitudinal direction of the vehicle to be washed, whereby the vehicle is prewashed by spraying prewash agent onto the surface of the vehicle during prewash, and washed.
2. Background of the Invention
An automatic vehicle washing apparatus typically comprises means for prewashing, means for actual washing, and means for drying. In addition to these means, the washing apparatus may also comprise other means according to the need, such as means for rinsing off detergents. The means and the vehicle to be washed are arranged to move in relation to each other in the longitudinal direction of the vehicle to be washed. Finnish application 924,420, for example, discloses an automatic vehicle washing equipment. When a vehicle is being washed by an automatic vehicle washing apparatus, the problem compared e.g. with handwash is that it is very difficult to ensure a sufficiently good washing result. To ensure a sufficiently good result, frequently excessive amounts of water, chemicals and washing time have to be employed, resulting in a waste of energy, water and chemicals.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a method of washing vehicles in an automatic vehicle washing apparatus, the method avoiding the above drawbacks.
The method of the invention is characterized by spraying the prewash agent onto the surface of the vehicle to be washed with the pseudo-pressure of the prewash agent exceeding 8 bar.
In association with automatic vehicle washing apparatuses, the prewash agent is typically sprayed onto the surface of the vehicle to be washed at a very low pressure. The typical pressure employed by e.g. a pump is about 5 bar, prewash agent being spread onto the surface of the vehicle practically without pressure, allowing for the effects of pressure losses. When tests were performed it was unexpectedly observed that by feeding the prewash agent onto the surface of the vehicle at a higher pressure, the washing result improved. The most unexpected observation was that with a further increase in pressure, the washing result was impaired after a given limit. Accordingly, it is essential to the invention that prewash agent is sprayed onto the surface of the vehicle to be washed at a sufficiently high pressure, but preferably not at an excessively high pressure.
It is an advantage of the invention that the washing result improves and/or the washing time can be reduced.


REFERENCES:
patent: 3409030 (1968-11-01), Schmidt
patent: 4135533 (1979-01-01), Gall et al.
patent: 4865058 (1989-09-01), Crotts et al.
patent: 5016662 (1991-05-01), Crotts et al.
patent: 3632554 (1988-04-01), None
patent: 3085/67 (1967-11-01), None
patent: 2627306 (1989-08-01), None

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