A
Anthony William Sloman
Guest
David Brown has suggested that I don\';t know as much about Norway as I ought, but I am a full bottle on one aspect Norwegian industrial history.
https://en.wikipedia.org/wiki/Johan_Richter_(inventor)
worked for the company Kamyr, which made and sold equipment for the paper industry. I met him when he and his wife visited Tasmania in the 1950s.
Around 1950 Kamyr sold a continuous digester to the Associated Pulp and Paper Mills at Burnie, Tasmania where my father was research manager .
It was the sixth one sold and the only one modified to run my father\'s patented two stage cook.
Instead of sticking fresh NaOH solution into the top of the digester with the raw wood chips, his scheme stuck it halfway down and took out the depleted solution with the digested wood chips at the bottom, but then piped it up to the top of the digester where it was still strong enough to start the process of digesting the raw wood chip. That let you get by with 16 tons of NaOH per hundred tons of wood chips, rather than 22 tons.
Obviously this was a crude approximation to counter-current cooking.
Mu father eventually worked out a scheme to run his digester fully counter current and it worked, and the company patented the idea. That got by with 12 tons of NaOH per hundred tons of wood chips, and cooked the chips even faster.
Johan Richter had spent ten years trying to get his counter-current scheme to work, and was impressed. Kamyr - as an organisation - wasn\'t and never paid any royalties, though they did sell their digesters set up to run counter-current.
Johan Richter\'s history of the company reflects the official line, but the copy he sent to my father had a rather more complimentary handwritten message on the title page.
--
Bill Sloman, Sydney
https://en.wikipedia.org/wiki/Johan_Richter_(inventor)
worked for the company Kamyr, which made and sold equipment for the paper industry. I met him when he and his wife visited Tasmania in the 1950s.
Around 1950 Kamyr sold a continuous digester to the Associated Pulp and Paper Mills at Burnie, Tasmania where my father was research manager .
It was the sixth one sold and the only one modified to run my father\'s patented two stage cook.
Instead of sticking fresh NaOH solution into the top of the digester with the raw wood chips, his scheme stuck it halfway down and took out the depleted solution with the digested wood chips at the bottom, but then piped it up to the top of the digester where it was still strong enough to start the process of digesting the raw wood chip. That let you get by with 16 tons of NaOH per hundred tons of wood chips, rather than 22 tons.
Obviously this was a crude approximation to counter-current cooking.
Mu father eventually worked out a scheme to run his digester fully counter current and it worked, and the company patented the idea. That got by with 12 tons of NaOH per hundred tons of wood chips, and cooked the chips even faster.
Johan Richter had spent ten years trying to get his counter-current scheme to work, and was impressed. Kamyr - as an organisation - wasn\'t and never paid any royalties, though they did sell their digesters set up to run counter-current.
Johan Richter\'s history of the company reflects the official line, but the copy he sent to my father had a rather more complimentary handwritten message on the title page.
--
Bill Sloman, Sydney