Floor Panel Press Skin Coating Without Grinding
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Solution Overview
Problem
Direct printing technology on large-format substrate boards leads to thickness inconsistencies and increased production costs due to the need for additional grinding and material usage, resulting in susceptibility to delamination and quality issues in laminate panels.
Innovation Solution
A method involving the formation of a wood material cake, pressing to create a substrate board with a press skin, applying a melamine-based resin base coat that penetrates into the press skin, followed by sequential layers of primer, decorative paint, and a wear-resistant seal, and then pressing the entire structure to form panels without grinding the press skin, allowing for thinner substrate boards and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the press skin is ground off completely to reduce roughness before coating, then the surface quality is improved, but the substrate board thickness must be increased by corresponding grinding allowance, increasing production costs
Solution Approach 1:
The press skin is retained during substrate board production and serves as a pre-prepared surface layer. Instead of removing it through grinding, the coating process is designed to work with the press skin intact, applying base coat and subsequent layers directly onto it. This preliminary preparation eliminates the need for thickness compensation.
Solution Approach 2:
The coating parameters and application method are modified to be compatible with the press skin surface. The base coat formulation and application process are adjusted to ensure proper adhesion and penetration into the press skin, transforming the surface characteristics to enable direct coating without mechanical removal.
2Length of stationary object
If direct printing technology is used on large-format substrate boards, then the thickness of finished laminate panels is reduced, but thickness inconsistencies occur and quality assurance slows down production
Solution Approach 1:
The substrate board is pre-formed with uniform thickness and a consistent press skin surface before coating. This preliminary preparation ensures that the base layer has controlled dimensions and surface properties, providing a stable foundation for subsequent coating operations and preventing thickness variations in the final panel.
Solution Approach 2:
Different layers are applied with specific properties tailored to their function. The base coat is formulated to penetrate and bond with the press skin, while subsequent decorative and protective layers have their own characteristic properties. This localized optimization of each layer's quality ensures overall thickness consistency and structural integrity.
3Productivity
If the press skin is retained without grinding, then production time and costs are reduced, but the high heat input during hot pressing causes adhesive to cure too quickly, breaking adhesive bonds and making panels susceptible to delamination
Solution Approach 1:
The adhesive formulation is modified to adjust its curing characteristics. The adhesive is designed to withstand the high heat input during hot pressing without premature curing, maintaining workability and bond strength. Temperature-time profiles and adhesive chemistry are coordinated to prevent bond breakdown while retaining the press skin.
Solution Approach 2:
The press skin serves as an intermediary layer between the adhesive and the external environment. It acts as a thermal buffer and bonding interface that protects the adhesive bonds from direct exposure to excessive heat, preventing premature curing and delamination while allowing the coating process to proceed efficiently.
4Loss of substance
If the substrate board is made thinner to reduce material usage, then resource consumption is reduced, but the panel may fall below the minimum thickness required by DIN 13329 standard
Solution Approach 1:
The panel is constructed as a composite structure with multiple functional layers: substrate board with press skin, base coat, primer, decorative layer, and protective layer. Each layer contributes to the overall thickness and structural properties, allowing the use of thinner substrate material while maintaining total panel thickness above the DIN 13329 minimum requirement through the combined thickness of all layers.
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 reduces production time and costs, enhances panel quality by preventing delamination, and maintains the desired thickness tolerance, achieving efficient and resource-preserving production of wear-resistant laminate panels.
Implementation Method 1
applying a base coat made of a liquid melamine-based resin to the upper face of the substrate board, the resin at least partially penetrating into the top surface layer of the substrate board and at least partially penetrating and improving the region of the press skin
Implementation Method 2
pressing the wood material cake at elevated temperature to form a large-format substrate board
Implementation Method 3
pressing the wood material cake at elevated temperature to form a large-format substrate board, which is provided press-finished and has a press skin that arose during the production of the substrate board
Implementation Method 4
pressing the layer structure under the action of pressure and temperature
Implementation Method 5
pressing the layer structure under the action of pressure and temperature
Data Source
AI summary
Floor panels include: an upper face, a lower face and two pairs of opposite side edges; a base coat layer, a primer layer, at least one decorative layer and a wear-resistant layer are applied at least to a press skin on the upper face; a base coat layer and a counteracting layer are applied to the lower face of the core; the upper face and the lower face of the core have the press skin that arose during pressing; the base coat layer has at least partly penetrated into the press skin on the upper face; the primer layer is arranged between the base coat layer and the decorative layer; the wear-resistant layer contains corundum particles and cellulose fibers; the decorative layer consists of a water-based paint; connecting mechanism and locking mechanism are attached to the side edges in order to connect and lock a plurality of panels without glue.