Other

Eka Nobel Ab

Gunnar P Goransson

Johan Landfors

Birgitta Sundblad

Arne Andersson

Magnus Wretborn

Hans A Baltsen

Process water from pulp manufacture is purified in a separator device by mechanical or a combination of mechanical and chemical methods and is thereafter evaporated, at least part of the concentrate resulting from the evaporation being recycled and mixed with the process water fed into the separator device. In a preferred embodiment, a precipitant is added to the mixed water comprising the process water and the concentrate. The part of the concentrate not recycled and mixed with the process water is supplied, optionally after further evaporation, with an acid to a pH of 1-5, whereupon resulting flocs and precipitates are removed in a separator device.

Method for purifying process water from pulp manufacture

Wood-resin-containing process water or wastewater from the pulp industry is purified by adding, as flocculants, a high-molecular-weight polyethylene oxide and a water-soluble, non-ionic cellulose ether, suitably having a flocculation temperature of 35.degree.-80.degree. C. The added amount per liter of water is preferably 2-20 mg of the high-molecular-weight polyethylene oxide and preferably 5-30 mg of the non-ionic cellulose ether.

Method for purifying process water or wastewater containing wood resin

Racket with the racket head built up by crossing strings fastened to a frame, especially a tennis racket. Both the main surfaces of the racket head have a concave profile over at least a portion of each surface in at least one dimension of the racket head. The concave profile is provided by distance pieces or spaceers of different thicknesses inserted between the strings at various crossing points.

Racket

Tennis racket with the racket head built up by crossing strings fastened to a frame, one set of which strings runs substantially in the longitudinal direction of the racket head and a second set of which runs substantially in the transverse direction thereof. In order to reduce the effect of unclean hits the active length of at least the longitudinal strings of a longitudinal center portion of the racket head is greater the farther away from the longitudinal center line of the racket head they are placed.

Growing community of inventors

Stockholm, Sweden

Gunnar P Goransson