Radiation-Cured Adhesive Layer for Low-Temperature Lamination
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Solution Overview
Problem
Conventional laminating techniques require high pressure and temperature, leading to inferior adherence quality between incompatible materials and potential damage to decorative patterns, especially with UV curable ink, and are not suitable for temperature-sensitive substrates.
Innovation Solution
A method using a curable substance that forms a layer between the substrate and film, allowing lamination at low temperatures (below 30°C) and minimal pressure, with radiation-induced polymerization to create an air-tight barrier for inert conditions, eliminating the need for additional resin-impregnated paper sheets and enabling the use of less compatible materials like PVC on ink-patterned substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laminating technique is used with high pressure and temperature, then the resin flows to the substrate and adheres the paper sheets, but the adherence quality is inferior between incompatible materials and decorative patterns are damaged
Solution Approach 1:
The patent changes the temperature and pressure parameters from conventional high values to low values (below 30°C, minimal pressure). This is achieved by using a curable substance that undergoes polymerization upon radiation exposure, eliminating the need for thermal activation and thereby protecting temperature-sensitive decorative patterns while maintaining strong adhesion.
Solution Approach 2:
The patent replaces the thermal-mechanical curing system (heat and pressure) with a radiation-induced polymerization system. The curable substance is activated by radiation (UV, electron beam, or other types) instead of heat, fundamentally changing the activation mechanism from thermal to radiative, which eliminates thermal damage to decorative patterns.
2Reliability
If high temperature is applied in conventional laminating process, then the resin cures and bonds the layers, but the decorative pattern of UV curable ink deteriorates
Solution Approach 1:
The patent replaces thermal curing with radiation-induced polymerization. The curable substance contains photoinitiators or other radiation-sensitive components that trigger polymerization when exposed to radiation, completely avoiding the high temperatures that would deteriorate UV curable ink patterns while achieving equivalent or superior bonding strength.
Solution Approach 2:
The patent changes the curing parameter from temperature to radiation exposure. Instead of controlling temperature and time for thermal curing, the process controls radiation dose and type (UV, electron beam, etc.), which activates the curable substance at ambient temperatures, preserving the integrity of temperature-sensitive decorative patterns.
3Reliability
If conventional laminating technique is used, then the resin-impregnated paper sheets are pressed onto the substrate, but the process requires relatively high pressure and temperature
Solution Approach 1:
The patent replaces the thermal-mechanical activation system with a radiation-based activation system. The curable substance is activated by radiation exposure at minimal or no pressure, eliminating the requirement for high temperature and pressure equipment while maintaining strong adhesion between layers.
Solution Approach 2:
The patent fundamentally changes the activation parameter from thermal energy to radiation energy. The curable substance is formulated with photoinitiators or radiation-sensitive components that trigger polymerization upon radiation exposure, allowing the process to proceed at room temperature or below 30°C with minimal pressure, dramatically reducing energy consumption and equipment requirements.
4Adaptability or versatility
If incompatible materials are used (e.g., PVC sheet on ink-patterned substrate), then material versatility is reduced, but conventional laminating techniques provide inferior adherence quality
Solution Approach 1:
The patent introduces a curable substance as an intermediary layer between incompatible materials. This substance acts as a universal adhesive that can bond diverse materials (PVC, metal, glass, wood, etc.) regardless of their compatibility, forming strong bonds through radiation-induced polymerization that creates a cross-linked network structure adhering to various substrates.
Solution Approach 2:
The patent changes the bonding mechanism from thermal-mechanical adhesion (which requires material compatibility and high energy input) to radiation-induced polymerization adhesion. The curable substance forms strong bonds through chemical cross-linking upon radiation exposure, creating versatile bonding capability across incompatible materials without requiring high temperature or pressure, thereby achieving both material versatility and high adherence quality.
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 provides improved adherence quality and protects decorative patterns by reducing thermal stress, allowing for the use of temperature-sensitive materials and minimizing transparency loss, while maintaining the integrity of the substrate and film.
Implementation Method 1
The curable substance may comprise a synthetic resin which is polymerized during the radiation treatment, more specifically via free radical polymerization. Radiation generates radicals in the substance.
Implementation Method 2
Due to the air-tightness of the film it functions as a barrier against oxygen transfer through the transparent film. This means that local inert conditions at the curable substance are created.
Data Source
Figure 1~2
AI summary
A method of covering a substrate comprises the steps of supplying a substrate (1), a curable substance (5) and a substantially air-tight transparent film (6), applying a decorative pattern (3) on at least one of the substrate (1) and the film (6), forming a stack of the substrate (1), the substance (5) and the film (6), wherein the substance (5) is sandwiched between the substrate (1) and the film (6), bringing the film (6), the substance (5) and the substrate (1) in close contact to each other and curing the substance (5) by means of radiation through the transparent film (6) and fixing the substance (5) to the film (6) and the substrate (1).