Modified Polyurethane Belt for Paper Machine Dewatering
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Solution Overview
Problem
Paper, board, pulp, and tissue machines face inefficiencies in dewatering processes, particularly in the forming and press sections, where existing felts and wires do not adequately enhance moisture removal, leading to reduced production efficiency.
Innovation Solution
A belt with a polyurethane matrix covalently bonded with polydialkylsiloxane is developed, which can be used in sleeve rolls and shoe presses to improve moisture removal by reducing friction and extending the belt's wear life through a modified manufacturing process that includes adding polydialkylsiloxane with functional groups to the polyurethane matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing felts and wires are used for moisture removal, then the dewatering process can be maintained, but the production efficiency is reduced due to inadequate moisture removal
Solution Approach 1:
The patent modifies the chemical composition and physical properties of the belt material by incorporating polydialkylsiloxane with functional groups into the polyurethane matrix. This changes the surface characteristics and friction properties of the belt, enabling more effective moisture removal and improving both dewatering effectiveness and production efficiency simultaneously
Solution Approach 2:
The patent creates a composite material system by combining polyurethane matrix with polydialkylsiloxane having functional groups. This composite structure integrates the mechanical strength of polyurethane with the moisture-responsive properties of polydialkylsiloxane, achieving enhanced dewatering performance that improves both productivity and reliability
2Duration of action of moving object
If polydialkylsiloxane is added to the polyurethane matrix, then friction is reduced and wear life is extended, but the manufacturing process becomes more complex
Solution Approach 1:
The patent incorporates polydialkylsiloxane with functional groups into the polyurethane matrix during the manufacturing process itself, rather than applying it as a separate post-processing step. This preliminary incorporation ensures uniform distribution and covalent bonding, extending belt life while integrating the modification into the existing manufacturing workflow
Solution Approach 2:
The functional groups on the polydialkylsiloxane act as intermediaries that form covalent bonds with the polyurethane matrix. This chemical mediation ensures strong integration of the siloxane into the polymer structure, creating a durable composite material that reduces friction and extends wear life without requiring complex additional manufacturing steps
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
The belt effectively reduces friction and wear, enhancing dewatering efficiency and extending the belt's operational life by maintaining consistent polydialkylsiloxane distribution throughout the polyurethane matrix, thereby improving the belt's performance in paper, board, pulp, and tissue machines.
Implementation Method 1
a polyurethane matrix having a covalent bond with the polydialkylsiloxane
Data Source
AI summary
A process produces a body of a belt (10) for a paper, board, pulp or tissue machine, the body having an inner surface and an outer surface. The process includes producing a modified polyurethane by adding a polydialkylsiloxane having at least one functional group to a manufacturing process of a polyurethane in order to obtain the modified polyurethane, which modified polyurethane is a polyurethane matrix having a covalent bond with the polydialkylsiloxane, and forming the body of the belt, wherein the body is the modified polyurethane. The belt (10) is for a paper, board, pulp, or tissue machine, or for a shoe press and a sleeve roll.