Method and device for making multiple retention-aided high-retention paper

Abstract

Embodiments of the invention disclose a method and a device for manufacturing high-retention paper under the aid of multiple retention. The method comprises the following steps: pulping waste paper ina fan pump; adding a highly-electropositive retention aid into the fan pump, and carrying out uniform mixing under stirring so as to form a long-fiber pulp; subjecting the long-fiber pulp to cuttingoff in a headbox screen so as to obtain a short-fiber pulp; adding a lowly-electropositive retention aid into the short-fiber pulp in a headbox of a paper machine, and carrying out uniform mixing under stirring so as to form a moderate-length fiber pulp used as a raw material of the high-retention paper. According to the invention, through addition of the highly-electropositive retention aid intothe paper pulp, the utilization rate of pulp fiber is improved; the long-fiber pulp is shortened through the headbox screen, so the situations of non-uniformity and no dehydration caused by papermaking are avoided; the short-fiber pulp is mixed with the lowly-electropositive retention aid, so the retention and dehydration performances of short fiber are improved; the method provided by the invention has high retention rate; the fiber in effluent water has a concentration of less than 0.08% and a retention rate of more than 85%; and the utilization rate of the waste paper is improved.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method and device for making multivariate and high-retention paper. Background technique [0002] People will produce a lot of waste paper in their production and life. If these waste papers are discarded casually, they will cause great pollution to the environment. Therefore, the country vigorously calls for the recycling and reuse of waste paper. , The requirements of an environment-friendly society. At the same time, making good use of these resources can also reduce our production costs. However, due to repeated recycling of waste paper fibers, the fibers are getting shorter and shorter. These short fibers are very easy to lose with the dehydration in the papermaking process, which also causes waste of resources and environmental pollution. In the existing papermaking technology, the main purpose of pulping waste paper is to filter out the impurities in the pulp, and ...

AI Technical Summary

Problems solved by technology

However, due to repeated recycling of waste paper fibers, the fibers are getting shorter and shorter. These short fibers are very easy to lose with the dehydration of the papermaking process, which also causes waste of resources and environmental pollution.

In the existing papermaking technology, the main purpose of pulping waste paper is to filter out the impurities in the pulp, and no further chemical changes are made to the pulp, and the short fibers in the waste paper have not been changed. Recycled paper products are generally of low quality, and the utilization efficiency of waste paper is not high

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