Partial Impregnation of Decorative Paper for Laminate Flooring
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Solution Overview
Problem
The production of laminate flooring faces challenges due to paper swelling during the impregnation process, leading to dimensional changes and issues with length and width repeat, as well as brittleness and high costs associated with completely impregnated papers.
Innovation Solution
A method involving partial impregnation of decorative paper on one side with a resin, applied to the unprinted underside, which reduces swelling and adhesion issues, allowing for better alignment and processing efficiency, using a melamine-formaldehyde or acrylate resin with a solids content of 30-70% by weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If decorative paper is completely impregnated with aqueous resin, then adhesion strength and splitting resistance are improved, but dimensional stability deteriorates due to swelling in longitudinal and transverse directions
Solution Approach 1:
The patent applies local quality by differentiating the impregnation treatment between different regions of the decorative paper. The side facing the wood-based panel receives full impregnation with aqueous resin to ensure strong adhesion, while the decorative side is kept dry or minimally impregnated to prevent swelling and maintain dimensional stability. This selective regional treatment resolves the contradiction between needing strong bonding and maintaining precise dimensions.
2Strength
If completely impregnated decorative paper is used, then splitting strength is improved, but brittleness increases and material loss through breakage occurs
Solution Approach 1:
The patent implements local quality by applying impregnation resin only to specific regions - primarily the sides and the side contacting the panel - rather than saturating the entire paper. This localized approach provides sufficient splitting strength at critical areas while leaving the decorative surface relatively dry, thereby preventing brittleness and reducing breakage during handling and processing.
3Manufacturing precision
If dry decorative paper is used to minimize swelling, then dimensional stability is improved, but adhesion problems occur due to insufficient resin content
Solution Approach 1:
The patent applies preliminary action by pre-impregnating specific areas of the decorative paper (sides and panel-contacting surface) with resin before the final assembly. This preliminary resin application ensures that when the paper is later bonded to the panel, adequate adhesion strength is achieved without requiring the entire paper to be fully impregnated, thus maintaining dimensional stability while ensuring proper bonding.
4Productivity
If continuous impregnation process is used, then productivity is improved, but swelling control becomes more difficult
Solution Approach 1:
The patent resolves this contradiction by implementing local quality within the continuous process - using resin application rollers or spray systems that selectively apply impregnation resin only to designated areas (sides and back surface) as the paper moves through the production line. This allows continuous high-speed processing while precisely controlling where swelling occurs, maintaining both productivity and dimensional accuracy.
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 approach minimizes capital investment, reduces material waste, and enhances production speed with energy savings, while ensuring better adhesion and alignment of the decorative paper to the carrier board, reducing the risk of wrinkling and improving the technological properties of the top layer.
Implementation Method 1
They change their dimensions as a result of water absorption in the longitudinal and transverse directions
Implementation Method 2
the resin used as an impregnating agent melts and connects the decorative paper to the core of the building panel
Data Source
AI summary
The invention relates to a method for producing a material plate, which comprises a carrier plate and a decorative paper arranged on the carrier plate, comprising the following steps: a) providing the carrier plate, b) applying at least one layer of at least one impregnating resin to at least one side of the carrier plate, c) providing the decorative paper, d) applying at least one resin as an impregnating agent to the side of the decorative paper lying opposite the decoration, and e) applying the decorative paper, such that the impregnated side opposite the decoration is applied to the side of the carrier plate provided with the impregnating resin.