Thermoplastic Panel Printing With Low-Absorption Coating for Lamination

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Solution Overview

Problem

Existing methods for manufacturing decorative panels with thermoplastic materials face challenges such as limited flexibility in decor changes, adhesion issues during lamination, and delamination due to water absorption by inkjet receiver coatings containing high water-absorbing particles, which are not compatible with thermoplastic materials like PVC.

Innovation Solution

A method involving an inkjet receiver coating with a water-absorbing substance content below 10% wt, preferably free from water-absorbing particles, using polymeric binders and additives to enhance flexibility, print quality, and adhesion, allowing for digital printing and effective lamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional offset or rotogravure printing is used to print decor on thermoplastic foil, then printing quality and adhesion are improved, but flexibility in decor changes is reduced and equipment downtime increases

Engineering Contradiction:

Improveflexibility in decor changesVSAvoidequipment downtime

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent replaces traditional mechanical printing systems (offset or rotogravure printing with physical rollers and plates) with a digital printing system that uses digital files and non-contact printing heads. This substitution eliminates the need for physical roller exchanges and extensive cleaning between decor changes, thereby significantly reducing equipment downtime and improving flexibility in decor changes while maintaining printing quality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If inkjet receiver coating with high water-absorbing particles is used to enhance print quality, then printing quality is improved, but adhesion during lamination deteriorates and delamination occurs

Engineering Contradiction:

Improveprint qualityVSAvoidadhesion during lamination

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent changes the key parameter of the inkjet receiver coating by reducing the water-absorbing particle content to below 10% wt, preferably to 1-5% wt. This parameter change ensures that the coating provides sufficient inkjet print quality while maintaining compatibility with thermoplastic materials during lamination, preventing delamination caused by excessive water absorption that would interfere with the bonding process.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite inkjet receiver coating formulation that combines minimal water-absorbing particles (such as silica or clay) with specific binders and additives. This composite approach allows the coating to provide necessary print reception properties while maintaining sufficient flexibility and adhesion characteristics for successful thermal lamination with thermoplastic wear layers.

Inventive Principle:

Principle #40Composite materials

3Manufacturing precision

If analog printing techniques are used for manufacturing decor foil, then printing quality is maintained, but production flexibility and response time to decor changes are reduced

Engineering Contradiction:

Improveprinting qualityVSAvoidproduction flexibility

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent replaces analog mechanical printing techniques with digital printing technology, where decor patterns are stored as digital files and transferred directly to the foil without physical intermediaries. This enables rapid switching between different decor designs by simply loading new digital files, significantly improving production flexibility and response time to decor changes while maintaining or enhancing printing quality through precise digital control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method improves flexibility, print quality, and adhesion, enabling efficient digital printing and lamination without delamination, reducing the need for equipment downtime and enhancing the production process.

Implementation Method 1

the step of coating at least one side of said foil, with an inkjet receiver coating

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

The mutual connection or adherence of the decor foil and the transparent wear layer is preferably obtained through a thermal lamination process, e.g. by using one or more heated press rollers

Methodology Applied

Scientific EffectThermal lamination: Lamination

Implementation Method 3

by bringing the thermoplastic top layer in contact with a structured press element, for example a structured press roller. The press element is preferably cooled, while the thermoplastic top layer is presented to the roller in a heated condition, such that the thermoplastic top layer may be cooled down and frozen while in contact with the press element

Methodology Applied

Scientific EffectThermal shaping: Heat Treatment

Data Source

PatentUS20250249699A1Method for manufacturing a panel

Publication Date: 2025.08.07 UNILIN BVBA

AI summary

A method may be provided for manufacturing a panel having a support and a top layer that includes a printed motif. The method may involve providing a printable substrate. The printable substrate may be provided with an inkjet receiver coating that has an absorbing substance content below 10% wt. The printed motif may be provided by inkjet printing with an ink.