Floor Panel Edge Coating for Watertight Seam Corners

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Solution Overview

Problem

Existing panel manufacturing methods fail to adequately seal seams, leading to moisture penetration and swelling, especially at corners, which can cause discoloration and mold formation, particularly in moisture-sensitive substrates like MDF or HDF.

Innovation Solution

A method involving angled nozzles positioned at less than 90 degrees to the panel edge, applied in a feed-through milling machine, ensures comprehensive coverage of side edges and corners with a water-repellent substance, using a combination of stationary and movable nozzles to treat adjacent edges efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vaccumate is used to apply water-repellent substance to side edges, then the edges can be treated, but the corner points are insufficiently covered due to difficulty in fine-tuning start and stop positions

Engineering Contradiction:

Improveseam sealing qualityVSAvoidcorner coverage precision

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The application device is divided into multiple independent nozzles (at least two, preferably three) positioned at different locations along the side edge. Each nozzle independently applies water-repellent substance to specific sections, ensuring complete coverage including corner points without requiring precise start-stop control of a single device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The nozzles are arranged in a spatial distribution along the side edge rather than using a single point application device. This spatial arrangement ensures that corner points and entire side edges are covered by multiple overlapping application zones, transforming a one-dimensional start-stop problem into a multi-point simultaneous coverage solution.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If profiled edge areas with milled coupling means are used for glueless joining, then panels can be joined without glue, but the milling quality is insufficient to keep seams permanently watertight

Engineering Contradiction:

Improveglueless couplingVSAvoidseam watertightness

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The side edges are pre-treated with water-repellent substance before the panels are assembled and before moisture exposure occurs. This preliminary protective coating ensures that when the panels are joined via milled coupling means, the seams are already protected against moisture penetration, compensating for the insufficient sealing capability of the milling alone.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The solution combines mechanical coupling (milled profiled edges) with chemical protection (water-repellent substance coating). The composite approach uses both the physical interlocking of milled edges and the chemical barrier of the water-repellent coating to achieve reliable watertight seams, overcoming the limitation of using either method alone.

Inventive Principle:

Principle #40Composite materials

3Device complexity

If corner points are not adequately treated with water-repellent substance, then application is simpler, but moisture penetration and swelling occur at corners

Engineering Contradiction:

Improveapplication device complexityVSAvoidmoisture penetration

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The application device uses multiple nozzles positioned at different locations to independently cover different sections of the side edges and corner points. This segmentation eliminates the need for complex start-stop control mechanisms, simplifying the device while ensuring complete coverage of vulnerable corner areas through spatial distribution of application points.

Inventive Principle:

Principle #1Segmentation

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 enhances seam sealing, minimizing moisture penetration and visible substrate swelling, while maintaining a glueless coupling mechanism, thus preventing mold and enhancing panel durability.

Implementation Method 1

the application device includes at least one, and preferably at least two, nozzles, in which at least one nozzle viewed in the plane of the panel is positioned at an angle of less than 90° with the corresponding side edge

Methodology Applied

Scientific EffectFluid spray deposition: Fluid Spray

Data Source

PatentUS12508617B2Method for manufacturing panels, and floor panel obtained hereby

Publication Date: 2025.12.30 UNILIN BV

AI summary

A method for manufacturing panels includes at least the step of covering one or more side edges of a relevant panel, and moving the panel with its respective side edge relatively beyond an application device. The application device includes at least one nozzle, positioned in the plane of the panel when viewed at an angle of less than 90° to the corresponding side edge. A floor panel includes a covered side edge.