A method and an arrangement at a paper machine
A technology of paper machine and separation device, which is applied in the direction of paper machine, paper making, paper machine wet end, etc.
Active Publication Date: 2012-03-21
相川光纤技术公司
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Problems solved by technology
In traditional fiber recycling plants using floating technology, chemical products will cause clumping, which will reduce the optical effect of the pigment
As a result, the titanium dioxide will lose its optical effect and part will be lost, e.g. in the form of deposits in the system
In addition, there are of course disadvantages related to fiber recovery, investment and operating costs due to separate units, and costs depending on the contamination and cleaning of the system, and more complex processes are required for the recovery units associated with the prior art disadvantages of chemistry
Method used
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Embodiment Construction
[0017] according to figure 1 , a paper machine typically includes an inlet for fibrous material, cellulose, which is usually supplied in the form of dry flakes, or in so-called integrated chemical plants directly from a cellulose plant in a fiber-containing process Available in liquid form. If the incoming material is in the form of flakes, the process (or processing) begins with pulp preparation involving a so-called pulper 2 where the flakes are disintegrated and mixed with process liquid, e.g. raw materials or pulp for papermaking. The pulp passes through different process (or processing) stages 4a, 4b, 4c, 4d, 4e... etc., which are basically irrelevant to the invention in this context, and at the end, through the headbox of the paper machine 5 The pulp is spread over a filament (mesh) 6 . The filament (wire) passes through a machine 7, where a large part of the process liquid is drained by suction in the form of so-called white water, while the pulp, which remains mois...
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The present invention relates to a method for reducing the spreading of additional agent(s) which is / are introduced into the process at a papermaking machine. A flowable paper pulp including fibres and a process liquid and having a consistency of not more than 10% is conducted towards the paper machine's headbox (5). Prior to the introduction (14) of said additional agent the consistency of the pulp is increased to a value higher than 10% by removing (8) process liquid and conducting (11) it in the upstream direction, while compensating process liquid is introduced (13) downstream. The present invention also relates to an arrangement at a paper machine, where separating means (8) are arranged in the process direction before means (14) for introducing additional agent (s). The arrangement further includes means (11) for conveying process liquid separated from the process in an upstream direction in the process, as well as means (13) for a downstream introduction of process liquid from a short circulation in order to compensate for the separated process liquid.
Description
technical field [0001] The invention relates to a method in a paper machine for reducing the dispersion of additives added to the process in a continuous process for preparing pulp in a paper machine, whereby a flowable pulp comprising fibers and process liquid and having a viscosity of not more than 10% is guided into the bin of the paper machine. [0002] The invention also relates to an arrangement in the pulp preparation of a paper machine in order to limit the dispersion of additives in the further process, which comprises a possible An inlet for the flowing pulp, also relates to a closed circulation system comprising a headbox for the paper machine, and means for adding said additives. [0003] In this patent application, a paper machine is defined as a machine for making a continuous paper web (or web). The expression pulp preparation as used in this patent application denotes a process which starts from a pulp (or pulp-like substance) comprising fibers, usually a cel...
Claims
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IPC IPC(8): D21H23/14D21H21/20D21F1/66
CPCD21H21/20D21H23/14D21F1/66
Inventor P·O·梅南德R·尼卡南K·梅恩
Owner 相川光纤技术公司