With the decreases of forest resources and the increases of human demands, paper recycling plant machinery becomes more and more popular in the waste paper production plant. The waste paper has become secondary fiber raw material for papermaking, and its fully recycled utilization has also become one of the most important ways to solve the lacking dilemma of raw materials in the waste paper production plant. But compared to the primary pulp, waste paper pulp has some shortcomings, which greatly limits the use of waste paper pulp and the quality of paper products. However, we can use some methods to solve these problems so as to improve the quality of waste paper pulp made by paper recycling plant machinery. Next, we will briefly introduce some problems needing attention when we use it.
Reasonable Use of Recycled Fiber
Recycled fibers from different kinds of waste paper have great difference in primary quality, so we should try our best to realize that the medium quality fiber can be used as high quality fiber and low quality fiber as medium quality fiber. So we must consider the use of recycled fibers as different grades. Especially for the larger or comprehensive waste paper production plant, it is entirely possible to use recycled fibers as different fiber grades.
Reasonable Grading or Co-use of Primary Pulp
Some paper or paper board can be made by using 100% recycled fiber. For example, newsprint paper can be made from 100% recycled fibers from old newspapers and magazines; paper board, paperboard or even white paper board also can be made by using 100% different recycled fibers. But in many cases, due to some differences in quality between recycled fiber and primary fiber, people often co-use some primary pulp to improve the product quality.
Choose Reasonable Processes, Paper Recycling Plant Machinery and Technologies
According to different kinds of waste paper and different products, we can choose different production processes. In order to meet the requirements of product quality, we should try the best to simplify production procedures to save paper recycling plant machinery investment, energy and water consumption and improve the yield of recycled fiber in the waste paper production plant. For example, if new screening equipment has the functions of both grading and dispersing of the fiber, we don’t need to be equipped with grader, dispersion machine and even the light impurity separator in production, which can greatly reduce the equipment investment and energy consumption.
In order to choose the suitable paper recycling plant machinery, we must be closely combined with the production process and fully consider their advanced performances. For example, in the selection of the deflaking paper recycling equipment, for a certain scale of paper production plant, the continuous deflaking equipment is better than the batch deflaking equipment, and the long-time strong deflaking equipment shall be not chosen to avoid the deinking difficulty in the next procedure. For cleaning equipment and purification equipment, we should choose the equipment with multi-functions as possible as we can. When we use the multi-functional cleaning equipment, we may get both grading and dispersing functions, which can reduce screening amount, dust, power consumption and save the cost for buying dispersion machine. Secondly, for the selection of flotation equipment, we can consider new multi-grade flotation equipment instead of multi-grade multi-device flotation equipment, which can greatly reduce the equipment number and energy consumption and save the occupying space in the paper production plant.
Every production process in the waste paper production shall be to choose the advanced technology base on related theory. During the deflaking procedure of waste paper, what process is the most conducive to deflaking and deinking of the pulp? During the deinking procedure of waste paper recycling, using different flotation equipments, what process can be more effective in the energy saving and the flotation rate improving? During the bleaching procedure of the flotation pulp, how to deal with the decomposition of hydrogen peroxide? How to deal with the adverse effects of fluorescent whitening agents in waste paper production plant? All of the above problems must be solved combining with actual situations of the paper production plant and the application of new technology.
Reasonable Construction for the Deinking Waste Paper Pulp Production Plant
Nowadays there are more than 100,000 tons deinking waste paper pulp production lines in China, but the size of the waste paper pulp production line abroad has reached an annual 350,000 tons output. The construction of larger waste paper pulp plant can not only meet the needs of the production of a larger papermaking plant, but also meet the production needs of the other local paper plants. In some metropolitan cities and larger areas, the construction of the larger waste paper production plant will be reasonable and beneficial. We must carefully choose the deinked pulp production line production process, the equipments and technologies to meet the environment needs.
Reasonable Application Development on the Deinking Sludge
The deinking sludge is generally rich in cellulose fiber, the filler, etc. According to specific circumstances, we can develop relevant application technologies to make it be used in the fields of fuel filler, building plate material or soil conditioner.
