公开(公告)号：CA1129157A

公开(公告)日：1982-08-10

申请号：CA345493

申请日：1980-02-13

Applicant: DEGUSSA

Inventor： KRUEGER HORST ,  BERNDT WILHELM ,  WINK JAKOB

IPC: D21C9/16

Abstract: Kraft or sulphate pulp is used in the unbleached state for the production of packaging material because of its good strength properties. However, the unbleached Kraft or sulphate pulp is not suitable for packaging material for food since it has an ugly brown colour and an unpleasant odor due to the decomposition process and the washing with condensates from evaporation. According to the invention, the Kraft or sulphate pulp may be brightend by approximately five points and deodorized by means of peroxide without reducing the strength. The treatment can be carried out in conventional plants for the production of pulp after diffusion washing in a thick-pulp tower. Hydrogen peroxide is preferably used as the peroxide.

公开(公告)号：FI793720A

公开(公告)日：1980-08-17

申请号：FI793720

申请日：1979-11-27

Applicant: DEGUSSA

Inventor： KRUGER HORST ,  BERNDT WILHELM ,  WINK JAKOB

IPC: D21C9/16 ,  D21C