Two-Layer Paper Web With Absorbency Agent For Laminated Board Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing paper webs used for forming the core layer of laminated boards often lack sufficient wet tensile strength and grammage, making them prone to tearing during resin impregnation, and they are also costly due to high fresh fibre content requirements.
Innovation Solution
A paper web comprising a first paper layer with high fresh fibre content and a second paper layer with higher recovered paper content, where the second paper layer is treated with an agent to increase resin absorbency, thereby enhancing wet tensile strength and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If recovered paper is used as base material, then cost is reduced and environmental friendliness is improved, but wet tensile strength becomes insufficient
Solution Approach 1:
The patent applies composite materials by creating a two-layer paper web structure where the first layer uses recovered paper (cost-effective, environmentally friendly) and the second layer uses fresh fibres (high strength). This composite structure allows the recovered paper layer to provide cost benefits while the fresh fibre layer provides the necessary wet tensile strength, resolving the contradiction between cost reduction and strength maintenance.
Solution Approach 2:
The patent applies local quality by assigning different material compositions to different layers of the paper web. The first layer (in contact with resin) uses recovered paper with modified absorbency, while the second layer uses fresh fibres for strength. Each layer has locally optimized properties: the first layer optimizes for resin absorption and cost, the second layer optimizes for wet tensile strength, thereby resolving the overall contradiction.
2Strength
If fresh fibre content is increased, then wet tensile strength is improved, but cost increases
Solution Approach 1:
The patent uses composite materials to combine fresh fibres and recovered paper in a two-layer structure. The second layer contains fresh fibres (up to 100% content) to provide high wet tensile strength, while the first layer uses recovered paper to reduce cost. This composite approach achieves the required strength without requiring the entire paper web to be made of expensive fresh fibres.
Solution Approach 2:
The patent applies local quality by concentrating fresh fibres specifically in the second layer where they are most needed for structural integrity and wet strength, while the first layer uses recovered paper for cost efficiency. This localized allocation of fresh fibres minimizes cost while maintaining the necessary strength properties.
3Productivity
If resin absorbency is increased in second paper layer, then resin penetration is improved, but uniformity of impregnation deteriorates due to different absorbencies of layers
Solution Approach 1:
The patent applies local quality by modifying the absorbency of the first layer (recovered paper layer) specifically to match the absorbency of the second layer (fresh fibre layer). This is achieved by adding absorbency-modifying agents to the recovered paper. The local modification ensures that both layers absorb resin at similar rates, maintaining uniform impregnation throughout the paper web while allowing the second layer to have sufficient resin penetration.
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 proposed paper web structure achieves improved wet tensile strength and reduced grammage, enabling efficient and cost-effective industrial production of laminated board core layers while maintaining environmental sustainability.
Implementation Method 1
The absorbency of the second paper layer is preferably increased in all embodiments by the agent reducing the surface tension of the resin that penetrates or comes into contact with the second paper layer
Implementation Method 2
by improving capillarity
Data Source
AI summary
The invention relates to a method for producing a paper web which is suitable for and/or designed to form a layer, in particular the core layer of a laminated board, by impregnating the paper web with a resin and subsequently curing the resin, comprising:—a first paper layer (1) made of a first material (3), and—a second paper layer (2) which is connected to the first paper layer (1) over the surface thereof and which is made of a second material (4), wherein—the first material (3) of the first paper layer (1) has a higher degree of absorbency for the resin than the second material (4) of the second paper layer (2). The invention is characterized in that—the second paper layer (2) is provided with an agent (5) for increasing the absorbency for the resin.