Solid Polymer Injection for Paper Drainage and Strength
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The paper industry faces challenges in optimizing paper or cardboard production, particularly in terms of yield, productivity, and quality, due to the logistical and energy-intensive requirements of using polyacrylamide solutions for improving drainage and dry strength properties, which necessitate equipment for dissolving polymers and heating the reaction medium.
Innovation Solution
A method involving the reaction of a water-soluble polymer in solid particle form with alkali metal hydroxide and hypohalide, allowing direct injection into the fibrous suspension, which simplifies the process by eliminating the need for polymer solution transport and heating, and expanding the range of molecular weights for improved drainage and dry strength agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyacrylamide solutions are used to improve drainage and dry strength properties, then the quality of paper or cardboard is improved, but the device complexity and energy consumption increase due to the need for dissolution equipment and heating
Solution Approach 1:
The invention changes the physical state parameter of the polymer from dissolved solution form to solid particle form. This parameter change eliminates the need for dissolution equipment and heating apparatus, as solid particles can be directly injected into the fibrous suspension without requiring complex preprocessing infrastructure.
Solution Approach 2:
The invention extracts and removes the problematic components (dissolution equipment and heating apparatus) from the paper-making process by using solid polymer particles instead of solutions. This extraction eliminates the need for complex infrastructure while maintaining the functional benefits of polymer addition.
2Reliability
If polyacrylamide solutions are used to improve drainage and dry strength properties, then the quality of paper or cardboard is improved, but the energy consumption increases due to heating requirements
Solution Approach 1:
The invention changes the physical state parameter of the polymer from dissolved solution form to solid particle form. This parameter change eliminates the need for heating the reaction medium, as solid particles can be directly injected into the fibrous suspension without requiring thermal energy input for dissolution.
3Reliability
If polyacrylamide solutions are used to improve drainage and dry strength properties, then the quality of paper or cardboard is improved, but the logistical costs increase due to the need for transport and storage of polymer solutions
Solution Approach 1:
The invention changes the physical state parameter of the polymer from dissolved solution form to solid particle form. This parameter change simplifies logistics by eliminating the need for specialized storage tanks and transport infrastructure required for polymer solutions, allowing direct injection of solid particles into the production line.
Solution Approach 2:
The invention extracts and removes the problematic logistical infrastructure (storage tanks and transport systems for polymer solutions) by using solid polymer particles. This extraction simplifies the manufacturing process and reduces logistical costs while maintaining product quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enhances drainage and dry strength properties while reducing logistical and energy costs, offering improved productivity and quality in paper or cardboard production without the need for complex dissolution or heating processes.
Implementation Method 1
the reaction of a water-soluble polymer in the form of solid particles in a mixture of hydroxide (alkali metal hydroxide and/or alkaline earth metal hydroxide) and of hypohalide (alkali metal hypohalide and/or alkaline earth metal hypohalide)
Data Source
AI summary
A method for producing a sheet of paper or cardboard from a fibrous suspension, includes injection of a polymer P2 into a fibrous suspension, forming of a sheet of paper or cardboard, and drying the sheet of paper or cardboard. The polymer P2 is prepared, before injection of the polymer P2, from a water-soluble polymer P1 in the form of solid particles. Polymer P1 consists of at least one nonionic monomer selected from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile. Polymer P1 is subjected to a reaction Re to yield polymer P2. The reaction Re includes the addition and the dissolution of solid particles of polymer P1 in an aqueous solution M1 of an alkali hydroxide and/or an alkaline earth hydroxide, and an alkali hypohalide and/or an alkaline earth hypohalide, prior to a reaction time of 10 seconds to 5 hours.