The audio is terrible but this short video gives a good summary of an older commercial processThank you for that information - do you know a resource where I can learn more? It's interesting how physically manipulating the soap makes a difference. The palm/pko soap I made sure could have benefitted from some milling as the texture was...chalky in appearance, filled with minute holes. Wonder if I saved one...
the milling part is still similar
Youtube also has a lot of modern Indian people using smaller machinery that works to this process
A very rudimentary test of this process can be achieved with a hammer or mallet - you can see the soap texture change
And since they can always pour in additives in the final process (to improve soap performance) - they base oils are NOT chosen for their soap calc performance properties -- but maybe only for final feel (after being milled) as @Marsi explains.
I think you have misunderstood
The industrial soapmakers DO choose oils for their performance properties.
To a level of detail that is incredible
(as ... triglycerides vary in their soaping properties, dependant on the lcoation of the fatty acid on the glycerine backbone. In industrial soap calculators each variant is a named ingredient)
Palm trees produce oils that are good for soaping
It was one logical choice as a vegetable oil replacement for Tallow in commercial manufacturing
The plant grows quickly and produces a large quantity of well profiled oils
Palm oil is cheap (meaning low cost) to produce
the industrial growing of Palm oil is like feedlots for cows
economy of scale reduces the price for raw ingredients
Trivia - did you know that one industrial soapmaker has their own Palm plantations?
(the plantation names in Google maps are there to see, if you are interested in looking for them)