Development Of The Wood Pulp Industry:
1816: F.G. KELLER was born in Hainichen/ Saxony, one year later H.VOELTER was born in Heidenheim.
1843: Invention of the groundwood-pulp-method by F.G.KELLER . After several preliminary tests as
reflections upon chemical disintegration with intensified pressure KELLER invents a method, which
produces by means of mechanical grinding of wood against a stone in a watery medium a new pulp
fiber called stone groundwood ( SGW ).
1845: Urged by KELLER the worldwide first wood-containing printing paper is produced by Friedrich
Gottlob KÜHN at the paper mill of Old-Chemnitz and is printed in Frankenberg.
1846: The economical use of KELLERs invention is contractual arranged by VOELTER.
1852: Construction of the first groundwood pulp equipments with VOELTERs design by J.M.VOITH in
1856: Industrial woodpulp production in Kriebstein/ Saxony at the KÜBLER & NIETHAMMER mill.
1867: VOELTERs steam-operated SGW-station and the grinding apparatus of the GEBRÜDER DECKER
company in Bad-Cannstädt on the world exhibition in Paris.
1881: KELLER appointed for honorary member of the " Verein Deutscher Holzstofffabrikanten".
1910: First electrically operated magazine grinder with hydraulic presses constructed by VOITH.
1921: First continual grinder ( VOITH ) installed in Schongau/ Bavaria.
1926: First GREAT NORTHERN grinder in USA.
1939: First ROBERTS grinder in USA (cyclic/ ring.shaped grinding )
1957: Production of refiner mechanical pulp ( RMP ) in atmospheric pressure with ASPLUND-refiner
in Sweden. Trials for the beating of low-energy SGW.
1963: Pilot plants for the production refiner mechanical pulp in intensified pressure and high temperature
( TMP ) in USA and Sweden.
1964: First results of laboratory tests for the production of stone groundwood in intensified pressure
( PGW ) by POWELL, LUHDE and LOGAN in Canada.
1969: Post-refining of screened SGW with postrefiners.
1977: Test for a large-scale technical production of PGW by the TAMPELLA-Company in Finland at Anjala
mill and A.LINDAHL at Bure mill ( Modo Cell-AB ) / Sweden.
1978: Ontario Paper Co. ( Opco )-Method in Canada ( TMP cooked with sodium sulphite = CTMP)
1980: First large-scale technical production unit for PGW at Myllykoski mill/ Finland.
1981: First Opco pilot plant at Kaipola Paper Mill in Finland.
1984: First Opco process in commercial operation at Q.N.S.Paper , Canada
1984: Introduction of the " Thermo Groundwood" ( TGW ) method by the VOITH company in Germany.