Early Europeanen automatic front loading machines

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Reply 40: The hole in the front is for adding detergent directly into the drum. So you must not open the door after the prewash is done, and leave it closed for safety. Since when this machine was inventet in 1951 there was no low sudding detergent availalbe. So when you do laundry you had to ad detergent carefulley, so the foam dosent flow over.
The hole in the back is for "Spülmittel" here an old package on ebay: https://www.ebay.de/itm/114356751390
This is a combination of, i would say, bleach and watersoftener, make stains from red wins etc, and yellowing go away and make rinse water soft like rain water.

skip to 4:25 to see how the washer is used
When boiling clothes in a tub, you may take Henko for soaking over night, Persil for boiling and washing, and Sil for the first hot rinse.

When the machine came on market the housewife would have done the laundry like she was used to. The Spülmittel was added to the tub after the prewash is done.
Here how the filling works:
The back hole is fittet to a tub. Water from watervalfe flows into this tub and fills it up until it is full and flows over in the next tub where the drum is. The flotor is conectet with the tub and when the waterlevel raises in the tub, it flots up switch of the cuerrent to the watervalfe and switch on the timer, heater, Motor etc. The tub with the Spülmittel has a heater, too. During the washing cycle the water will timed heatet up until it is hot. If you set the timer for shorter wash, lower tempearture for the clothes and the tub with the Spülmittel will be the result. (See the different starts in the cycle in the video.)
Because of the detergent you had to rinse the clothes in the first rise with hot water, in the second with warm water an final in cold water.
Since the maufactures of detergent jump on the new technology, the next generation of constructa does all rinses cold, saving lots of energy.
The double doors of the Bauknecht an AEG etc. was the result of invention of the not boltet down machines from construca. Makes it possible to install the washer easily in a flat or appartment. Constructa has inventet the door seal and put a patent on it. If the other manufacturers would build their machines with that seal, they must pay for it until the patent run out, and now the most washers ar build like today kown.
Thanks for sharing my Bauknecht WA35 washer.
Happy new year, Technowasher
 
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Henkel's "Sil" was largely sodium perborate. It was claimed using product in first rinse helped prevent greying, yellowing, removed marks not shifted during wash...

Much of the reason behind Henkel's German wash trinity (Henko, Persil, Sil) was that Persil still was soap based product by late 1950's. Meanwhile Unilever came out with Sunil which was a detergent (Henkel had Dixan).

Because Sunil was a detergent much of the need to pre-soak, add various additives and use something in first rinse was eliminated.

https://www.automaticwasher.org/cgi-bin/TD/TD-VIEWTHREAD.cgi?68413

When soap is used on wash day first (and maybe second) rinse must be hot to boiling or at least warm water. If cold water is used right after a hot or warm water wash soap will solidify back into fabrics trapping dirt and schmutz with it. This residue leads to "tattle-tale grey" wash.

Detergents OTOH don't have this issue which is one of the reasons why they largely displaced soap on wash day.
 

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