Tissue Paper High Consistency Refining

Technology, application and service for high-consistency refining of hardwood pulp on Tissue paper:

For treating hardwood pulp, the high consistency refining system can increase tensile and bursting strength so to lessen use of softwood fiber. 

Tissue paper using hardwood pulp and softwood pulp as raw materials has the problem of a large proportion of long fibers (usually ranging from 20-35%), and the average price difference between long and short fibers is $300 USD, which is cost concerns on paper mills. The main reason is that low-consistency refining is applied to treat hardwood pulp, light refining is generally used. Short fibers do not provide the strength required by tissue paper, which are mainly provided by long fibers.

The reason why heavy refining cannot be used due to low-consistency severely cuts fibers. Although the tensile strength can be improved, it cannot guarantee the strength properties related to paper making and post-processing, such as breaking resistance and tearing, while also reduce bulk.

The high-consistency refining system provided by Genda can solve this problem. High-consistency refining process hardwood pulp will not cause fiber cutting no matter how high the beating degree is. At the same time, the fiber kink and curl produced by high-consistency refining process can also maintain a good bulk. Hardwood pulp can give full play to the strength properties of short fiber raw materials through HC refining process. While maintaining various strength indicators and bulk, the long fiber ratio is reduced by 10-15%, which greatly optimizes cost reduction. At the same time, high-consistency refining can greatly improve the softness and surface smoothness of the finished paper. Genda have cooperated with many customers and have completed the construction and renovation of more than 20 wood pulp tissue production lines. Our supply covers various needs of customers: innovative technology, reliability and operability, and advanced automation solutions and turnkey engineering services to ensure your paper performance improvement and cost reduction while maintaining smooth operation.

1. Process Technology

The advantages of applying High Consistency Refining to Tissue paper:

• It can effectively improve the tensile strength, tear strength and other strength properties of paper by 10-20%;

• It can obviously improve the softness and absorbency of tissue paper and increase the bulk;

• In the papermaking process, the fiber retention rate is high, and the white water concentration under the wire is low, and the reduction rate of 15-25% can effectively reduce the production cost;

• Improve the bonding performance of fine fibers and long fibers, and improve the phenomenon of fiber loss and powder loss;

• Due to the effective retention of fiber length, the reduction of fine fibers and the improvement of fiber water filtration performance, the improvement range is about 10%, and the vehicle speed is increased by 1-5%;

• Due to the ability to improve the softness of the fiber, the application range of the fiber can be greatly improved.

2. Solution

We maintaining close cooperation with customers, so that we can develop targeted high-consistency refining processes and pulping solutions according to the characteristics of different customers' Tissue paper varieties, so as to meet customers' needs in terms of product improvement or cost reduction. We provide a package of solutions including process design, equipment selection and supply, advanced process control system with one-key connection with upper and down stream equipment, guided installation services, and general contract engineering services.

3．High-valued customer project case

Picture: Vinda Paper low-consistency to high-consistency refining transformation.

Case study

Time and place: 2018-2022 Hubei Vinda (five sets), Zhejiang Vinda (one set), Sichuan Vinda (one set), Shandong Vinda (two sets)

Paper machine: Tesco 1600m 2800 paper machine

Customer Requirement: Reduce the ratio of long fiber usage

Solution: Provide nine sets of Genda HCR1100 high-consistency refining system

Implementation results: reduce the long fiber ratio by 10-20%, hand feel is significantly improved, the paper machine performance and post-processing performance are improved.