DE4219620A1 - Domestic dishwasher detergent feed - has separate and time displaced feeds of different media to the washing water - Google Patents

Abstract

In the detergent feed operation in a domestic dishwasher, for a dosed and program controlled supply of two different cleaning and bleaching materials, they are passed into the washing water separately and at displaced times for mixing with the washing water. The detergent medium is pref. fed during the prerinsing cycle program and at the latest at the start of the next cleaning program cycle where heat is used. The bleaching medium is initially fed during the cleaning program cycle where the temp. of the washing water is 40 deg.C. During the cleaning program cycle, the heating speed and the heating profile of the water is retarded according to the effectiveness of the cleaning media. USE/ADVANTAGE - The operation is for the delivery of an alkali powder or liquid cleaner and an acid rinsing medium into the washing water of the domestic dishwasher. It ensures that the heat results are obtained with a chemical input containing an enzyme medium during the washing program.

Description

The invention relates to a method for adding detergent Household dishwashers according to the preamble of claim 1.

In dishwashers, the mechanical effect of cleaning is limited compared to traditional hand washing. Chemical cleaning has priority here. Basically two different products are used for the rinsing process, namely alkaline detergent (powder or liquid) and acidic rinse aid (only liquid). The cleaner mainly contains:
Polyphosphates: ensure that detached food remains do not settle on the crockery parts but float in the alkali.
Silicates: Help stubborn food residues, such as starchy residues, baked and dried dirt to swell and remove and at the same time serve as inhibitors, ie they prevent the chemical alkali attack on dishes and metal.
Surfactants: reduce the surface tension of the water and have a dirt-removing effect; and finally
chlorine-containing bleaching agents: germicidal and light dark residues (e.g. from tea or the like).

Partial amounts of the necessary detergent are mostly used in the rinsing process already in the pre-wash cycle and only increasingly in the subsequent one Cleaning cycle automatically dosed. In the cleaning cycle affects the Height of the water temperature the washing result.

The rinse aid contains:

Again surfactants: relax the water so that it can be removed from all surfaces can drain evenly and quickly.

Acids: Dissolve the stain-forming lime residues and ensure clean, shiny dishes.  

Solubilizer: Prevent the ingredients and keep them in solution.

Rinse aids are only used in the final "rinse aid" admitted.

(From HEA picture service; Series: Dishwashers, February 90 edition)

(The above comments regarding rinse aid are for the new procedures are not relevant and are only for completeness for the sake of being listed).

Due to more recent discoveries, more and more enzymes are coming Detergents for use (including under the name enzyme-containing bleach compositions known). Your full Efficacy is limited in (hot) dishwashers set because bleach from certain temperatures chlorine or Release oxygen-releasing substances. Especially oxygen causes the enzymes to be destroyed. It can therefore only be special Enzyme types are used or a reduced effectiveness of the By means is accepted. That is, in other words: such Despite their improved cleaning power, agents allow in Dishwashers do not use optimal processes.

The invention has for its object to provide a method which the chemical entry of enzyme-containing agents into the water Dishwasher the cleaning process during the program adapts optimally.

This object according to the invention is characterized by the Features of claim 1 solved. Further advantageous embodiments of the Invention can be found in the subclaims.

The advantages that can be achieved with the invention are as follows: The new Process improves the cleaning result of conventional washing programs considerably. Use of chemicals and energy are reduced.

The new procedure now provides for, not a complete one, already all detergents containing substances in the rinse water  to initiate, but there are two different, complementary Means to use, the one mainly based on enzymes Possesses cleaning properties and the other mainly from There is chlorine or oxygen-releasing and bleaching components contains. As a result of the separate addition, the enzymes can initially full cleaning staff unfold before the bleach its share done on the cleaning process. The dosage of the enzyme-containing agent takes place during the pre-rinse, but at the latest at the beginning of the actual cleaning cycle. The addition of the separate bleach takes place only in the course of the cleaning cycle, after reaching one predetermined alkali temperature, preferably at 40 ° C. The Heating rate or the heating profile (temperature increase in Depending on the time) of the lye is also slowed down in such a way that the enzymes are full and long enough Can develop cleaning properties.

Practical realizations with regard to separate and delayed Funding can be:

The device generally has two different dosing chambers (additional to the rinse aid dispenser), their emptying from each other can be controlled independently and precisely to the program; or the enzyme-containing agent is used by the user at the start of the program the bleach on the other hand, the program is controlled by the normal dosing chamber initiated.

Furthermore, both agents can be from two different storage containers be initiated automatically and at the respective time.

One remedy is stocked and the supplement from the usual Dosing chamber added.

A complete cleaner contains bleach, as is currently the case are modified by the manufacturer in such a way that they only change when they are reached dissolve a predetermined temperature and late in the cleaning process take part. (For example in the form of a wax layer coating with precisely defined melting point).  

The same effect can be achieved if an enzyme-containing one Detergent consists of components that are different Possess solution properties. The enzyme-containing part dissolves quickly on, the component with the bleaching substance is delayed in this way in solution that they only at an alkali temperature equal to or greater than 40 ° C is effective. The complete cleaner consists of multi-part layered tablets. In the case of powder detergents the grains of sparingly soluble bleaching substances, which from fast-soluble enzymes are encased.

In summary, the new process will reduce the Environmental pollution through the synergistic use of chemistry and energy reached.

Claims (4)

1. Process for the addition of detergent to household dishwashers, in particular for the metered and program-controlled addition of two different agents divided into cleaning and bleaching substances, characterized in that the two substances of the detergent are added individually and with a time delay to the washing liquor. 2. The method according to claim 1, characterized in that the agent with the cleaning substances during the program section "Prewash cycle", however at the latest at the beginning of the following and heatable program section "cleaning cycle" is added. 3. The method according to claim 1, characterized in that the agent with the bleaching substances only during the program section "Cleaning cycle" added at a rinse water temperature of 40 ° C becomes. 4. The method according to claims 2 or 3, characterized in that in the program section "cleaning cycle" the heating rate or the heating profile of the soapy water with regard to the effectiveness of Detergent substances is slowed down.