DE1792358A1 - Process for the automatic washing of dishes - Google Patents

Description

Henke. & Cie GmbH

Patent department
Dr. Bz / Et

Patent application
D.

Process for machine washing of dishes

The invention relates to a method for washing dishes in commercial dishwashers. The purpose of the procedure is that Prevention of the appearance of starch and protein deposits on the washed dishes.

When washing dishes in commercial dishwashers there are only very short contact times between cleaning dots and wash ware available. This often leads to deposits on the dishes, which are mainly made up of residues of protein and starchy leftovers form. These rubbers can can no longer be eliminated by the usual rinsing process in the machines, but accumulate from rinsing process to rinsing process more and more »

In order to remove these residues, you had to use the dishes Subject to so-called immersion cleaning at certain time intervals. This is done using alkaline products containing sodium perborate Baths that oxidatively break down the protein-starch residues. To one To achieve a sufficient cleaning effect, a temperature

209844/1121

- 2 - BATHROOM

applied at a temperature of at least 80 - 85 ° C. As the immersion cleaning outside the dishwasher in a separate process.

must be made, result from the necessary heating and handling the hot, alkaline, perborate-containing ones Baths not only have certain inconveniences, but also considerable dangers for the operating personnel.

The invention is based on the object of improving the cleaning result when washing dishes soiled with protein and starch in commercial dishwashers. It will The aim is to prevent the formation of starch and protein coatings from To be prevented from the outset while at the same time saving snargy and protecting the dishes as much as possible. In addition, coil a good sterilization of the dishes can be achieved.

The solution to the object according to the invention consists in a method for washing dishes in commercial dishwashers with the characteristic that a soaking bath consisting of an alkaline, active chlorine-containing aqueous solution precedes the machine wash cycle, which usually consists of pre-cleaning, intermediate washing and rinsing, and wherein the tableware is treated at least Jo minutes at temperatures up to at most 5o ° C.

209844/1121

Solid baths are preferably used for the preparation of the one-way baths powdery mixtures of alkalis or alkaline-acting Compounds such as caustic alkalis, alkali carbonates, alkali silicates, alkali polyphosphates and the like, as well as chlorine-releasing compounds Compounds such as trichloroisocyanuric acid or its alkali or Alkaline earth salts or alkali or alkaline earth hypochlorites are used. The mixtures can also contain complexing agents and alkali-resistant wetting agents. Suitable mixtures exist, for example the end

5 - 90 % caustic soda

ο * - 4o % sodium metasilicate

ο - 5o % soda

ο-, ^ o % N? .triumt.L-ipolyphQsph? t

2 - Io % Trichlorisocyp.nursäure or their alkali salts or sodium hypochlorite

o- 5 % of a preferably nonionogenic wetting agent based on an alkylene oxide polymer

To prepare the soaking baths, 5 - 20 g / l of one is poured into the The above-mentioned range of the mixture dissolved in water. The aqueous solutions should have a pH of 8-14, preferably 11-12. Tap water at room temperature or, if available, warm water is used to prepare the liquor

-4 -

209844/1121

BATH ORIGINAL

from the service water pipe, which is usually a temperature of about 5o "C is used.

To carry out the soaking process, the dirty dishes, which have been freed from the coarsest food residues, are placed in the soft liquor inserted. The dwell time shouldn't be under Jo Minutes. The dishes are preferably left in the soft liquor overnight and placed in the the next morning Dishwasher a. In this way, a smooth workflow can be achieved. By saving thermal energy compared to the previous way of working as well as by reducing the risk to the operating personnel further advantages of the claimed method.

As in contrast. ^ U the well-known immersion cleaning process by the previous week just described, no robbery dishes normal facial cleansing must be connected will. For this purpose, the dishes are placed after the pre-soak placed in the dishwasher as usual. The cleaning cycle in the machine corresponds to the normal work sequence, with preferably one or more alkaline cleaning cycles and - optionally after further intermediate rinsing cycles Fresh water - one or more clear soaps with wetting agent and, if necessary, liquors adjusted to acidic conditions are used. By the invention, from pre-soaking and machine Rinse existing mode of operation; enrichment of protein and completely prevent starchy food residues on the dishes. It was found that even after a significant

2Q9844 / 1121

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BATH ORIGINAL

1732358

Number of flushing processes a consistently clean and constant glossy dishes are obtained. With the current state of the art, these do not apply at more or less short intervals necessary immersion cleaning processes with hot, alkaline, solutions containing perborate.

The procedure described can also be used in other cases where protein-starch deposits, which are annoying due to accumulation, are deposited on dishes. Can this? z. B. when rinsing of dishes in domestic dishwashers or when washing by hand »

209844/1121

BATH ORIGINAL

example 1

To prepare a pre-soaking liquor, Io g / l of a mixture are required from ■ - ",

• 2o % pentasodium triphosphate
22 % sodium metasilicate 5o % caustic soda

6 % potassium dichloroisocyanurate

2 % of an adduct of 4o percent by weight of ethylene oxide with a polypropylene glycol with a molecular weight of 125o

dissolved in water at 40 ° C. The dishes to be cleaned become Avoid the formation of protein-starch coatings for about j5o minutes in this liquor air-soaked and then as usual in one Dishwashing machine subjected to a standard cleaning process.

Example 2

A powdery mixture with a good cleaning vortex Protein-starch toppings have the following composition:

28 % pentasodium triphosphate
$ 35> sodium metasilicate
27 % caustic soda

8 % potassium dichloroisocyanurate

2% of an adduct of 7 moles Ä'thylenoxid to a Fettalkohal · mixture of chain lengths C ₁₂ ~ ^C i4

The dirty dishes are placed in a cold solution of Io g / l

209844/1 * ^ 1-

BATH ORIGINAL

- τ -

soaked the above mixture overnight (for at least 12 hours) and then rinsed in a dishwasher as usual.

Example 3

The following powdery mixture is also to be prepared

Well suited for a pre-soaking liquor: ■

2o % foatrium metasilicate.
4-7 % soda

2o % caustic soda.

Io % I potassium dichloroisocyanurate

3 % of an adduct of 4o percent by weight ethylene oxide
to a Pclypropylenglj: ol of the molecular weight 125o

The dirty dishes are placed in a 5oC hot solution
Contains 10 g / l of the above mixture, soaked for one hour and then subjected to the usual mechanical cleaning cycle in a dishwasher.

In all three cases, the formation of protein-starch deposits on the dishes was certain, even after a large number of washes be prevented.

209844/11 ?!

Claims (1)

P A T.E NTAN S P R U G HE 1. A method for washing dishes in commercial dishwashers, characterized in that the usual Way, consisting of pre-cleaning, intermediate rinsing and final rinsing, a machine wash cycle precedes a soaking bath, which consists of a alkali, active chlorine-containing aqueous solution, and in which the dishes at least 1 hour at temperatures up to is treated at a maximum of 5o ° C. 2. The method according to claim 1, characterized in that the Soaking baths have a pH of 8-14, preferably 11-12 exhibit. J5. Method according to Claims 1 and 2, characterized in that the soaking baths from 5 - 20 g / l of a mixture 5 - 9d $ caustic soda ο - 4o / έ sodium metaphor ο - 5o % soda ο - Jo % sodium tripolyphosphate 2 - Io % trichloroisocyanuric acid dzw. their alkali salts, or sodium hypochlorite ο - 5 %> of a preferably non-ionic wetting agent based on an alkylene oxide polymer contain. - 9 -209844/1121 BATH ORIGINAL . '■■■■ - 9 - 4. Process according to claims 1-5 * dadureh characterized that the dishes are placed in the pre-soaking liquor overnight. HENKEL & CIE. GmbH. in general (Dr. Haas) 209844/1121