Reactive Hot-Melt Embossing for Deep Surface Structures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for producing structured surfaces in the furniture and flooring industry fail to achieve deep embossing with high layer thicknesses, resulting in surfaces that lack the desired haptic and optical properties of natural materials, and are prone to recovery phenomena over time.
Innovation Solution
A method involving the application of a moisture-crosslinking reactive hot-melt compound based on polyurethane, followed by embossing with a textured mold, and subsequent lacquer application, allowing for high layer thicknesses and deep structure creation with improved abrasion and impact resistance, while maintaining a soft touch and preventing surface recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional painting or hot coating methods are used to create structured surfaces, then the surface can be coated with paint or resin, but deep embossing with high layer thicknesses cannot be achieved
Solution Approach 1:
The patent applies parameter changes by utilizing the temperature-dependent viscosity characteristics of the thermoplastic coating material. During hot coating, the material is applied at elevated temperatures where it maintains low viscosity, enabling deep embossing. During cooling, the viscosity increases dramatically, locking in the embossed structure and preventing recovery. This parameter change allows achieving deep embossing with high layer thicknesses that would be impossible with conventional painting methods.
Solution Approach 2:
The patent employs composite materials by combining a thermoplastic coating material with specific rheological properties (temperature-dependent viscosity) with the substrate and embossing tool. This composite system enables the coating to flow into deep embossed structures during hot application and then solidify to maintain the structure, achieving both deep embossing and high layer thickness simultaneously.
2Reliability
If the surface is structured to imitate natural materials, then the haptic and optical properties improve, but the surface becomes prone to recovery phenomena over time
Solution Approach 1:
The patent uses parameter changes to resolve the recovery problem. The thermoplastic coating material undergoes a viscosity transition from liquid-like at application temperature to solid-like during cooling. This parameter change locks the embossed structure in place, preventing the recovery phenomena that plague conventional painted or resin-coated surfaces. The structure is retained reliably over time due to this irreversible viscosity change.
3Manufacturing precision
If thin layers are applied to prevent recovery, then surface stability improves, but deep embossing and high layer thicknesses are prevented
Solution Approach 1:
The patent overcomes the thin-layer limitation through parameter changes. The thermoplastic coating is applied at elevated temperatures where it has low viscosity, allowing it to be applied in thick layers that fully penetrate the embossed structure. During cooling, the viscosity increases, locking the structure in place and preventing recovery. The result is both deep embossing and high layer thickness with improved abrasion resistance, without requiring thin layers.
4Manufacturing precision
If mechanical embossing is performed on cured paint systems, then structured surfaces can be created, but the surfaces turn out to be too hard and too brittle
Solution Approach 1:
The patent applies preliminary action by performing the embossing operation during the hot coating process, before the coating material fully cools and solidifies. The coating is still in a plastic, flowable state during embossing, allowing deep structure formation without excessive force. After cooling, the material solidifies with the embossed structure already embedded, resulting in a surface that is structured but not overly hard or brittle.
Solution Approach 2:
The patent uses parameter changes to avoid brittleness. The coating material's temperature and viscosity are controlled during the process: high temperature and low viscosity during embossing allow gentle structure formation, while cooling increases viscosity and locks the structure. This parameter control prevents the coating from becoming too hard and brittle, maintaining flexibility while achieving deep embossing.
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 enables the production of surfaces with a velvety, soft feel and enhanced optical and haptic properties, achieving deep embossing with high layer thicknesses and improved resistance, without surface recovery, thus mimicking natural materials effectively.
Implementation Method 1
a layer of a moisture-crosslinking reactive hot-melt compound based on polyurethane is applied to at least part of a surface of the support surface
Implementation Method 2
a layer of a moisture-crosslinking reactive hot-melt compound based on polyurethane is applied to at least part of a surface of the support surface
Implementation Method 3
a structured surface is produced on the applied layer structure by means of an element with a textured surface
Data Source
Figure 1
AI summary
The present invention relates to a method for producing structured surfaces by applying a reactive melt layer and then embossing the surface, and to an article produced in such a way.