Method of homogenizing the constitution of a web of paper
AssigneeJ. M. Voith GmbH
InventorsUlrich Begemann, Helmut Heinzmann, Wolfgang Ruf
Life of this patent
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Abstract
A method of manufacturing a web of fibers, especially a web of paper. The pulp is uniformly distributed through an outlet over the width of the machine and along a wire or between two wires. Most of the moisture is subsequently extracted from the pulp accommodated on or between the wires at a draining point. Various amounts of retaining agents are added to the pulp at sections across the headbox and the web in order to control the level of retention sectionally.
Claims11
Method for operating a headbox of a paper making machine, comprising the steps of:
- feeding a plurality of mixers of the headbox with a first stream of paper stock and selectively feeding the mixers with a second stream of retaining agent;
- feeding mixed contents of each of the mixers to a respective stock holding compartment of a plurality of stock compartments arrayed across a width dimension of the headbox;
- and
- controlling the amount of retaining agent flowing into each of the mixers to achieve uniform retention characteristics across an entire paper web formed by stock sprayed from the headbox.
A headbox for a paper making machine, the headbox comprising:
- a plurality of mixers each including means to receive a first stream of paper stock and a second stream of retaining agent, each of the mixers being effective to mix stock and retaining agent;
- a stock holder comprising a plurality of compartments, each compartment being connected to receive admixed contents of a respective one of the mixers, the compartments being arrayed across a width dimension of the headbox;
- and
- means for controlling the amount, if any, of the retaining agent flowing into each of the mixers to achieve uniform retention characteristics across an entire paper web formed by stock sprayed from the headbox.
Dependencies are inferred from the claim text.