Heat-Resistant Acrylic Laminate for Laser Marking
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Solution Overview
Problem
Existing laser-markable laminates fail to maintain image integrity and workability at high temperatures, often cracking or curling when exposed to severe conditions, and have poor attachment properties due to brittleness or lack of flexibility.
Innovation Solution
A laser-markable laminate with a specific structure comprising a pigmented layer, a base layer, and a destructible layer, all made of crosslinked acrylic resin, with balanced thickness and tensile elongation at break, ensuring durability and flexibility, allowing for clear imaging and secure attachment even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-resistant resin (polyimide or polyamide) is used to make the pigmented resin layer, then heat resistance is improved, but flexibility deteriorates causing peripheral portion lifting
Solution Approach 1:
The patent changes the chemical composition parameters of the resin layer by using crosslinked acrylic resin with specific tensile elongation at break values (5-30%) instead of conventional polyimide or polyamide resins. This parameter change maintains heat resistance while improving flexibility to prevent peripheral lifting on curved surfaces.
Solution Approach 2:
The patent creates a composite structure with multiple layers (pigmented resin layer, base layer, destructible layer) where each layer has different properties. The pigmented resin layer uses crosslinked acrylic resin that combines heat resistance with flexibility, while the base layer provides structural support, achieving both heat resistance and overall flexibility.
2Ease of operation
If crosslinked acrylic resin with high tensile elongation at break is used, then flexibility is improved, but attachment workability deteriorates due to softness
Solution Approach 1:
The patent optimizes the tensile elongation at break parameter to a specific range (5-30%). This parameter setting provides the right balance: enough flexibility for curved surfaces but sufficient stiffness for attachment workability. The pigmented resin layer specifically has tensile elongation at break of 5-30%, preventing excessive softness.
Solution Approach 2:
The patent assigns different mechanical properties to different layers. The pigmented resin layer has moderate flexibility (tensile elongation at break 5-30%) for conformability, while the base layer has higher flexibility (tensile elongation at break 100-500%) to provide overall structural flexibility without compromising attachment workability of the pigmented layer.
3Quantity of substance
If ordinary label is used for laser marking, then cost is reduced, but markability and handling properties deteriorate
Solution Approach 1:
The patent creates a specialized composite laminate structure with three functional layers: pigmented resin layer (laser absorbent), base layer (structural support), and destructible layer (tamper evidence). This composite structure provides reliable laser markability and handling properties that ordinary labels cannot achieve.
Solution Approach 2:
The patent uses pigmented resin layers with specific color combinations between the pigmented resin layer and base layer. The pigmented resin layer contains laser-absorbing pigments that enable clear laser marking, while the color contrast with the base layer enhances visual distinguishability of the marked information.
4Temperature
If laser-markable laminate is used in severe temperature condition (≥150°C), then heat resistance is improved, but image integrity deteriorates due to cracking
Solution Approach 1:
The patent changes the thermal and mechanical parameters of the resin by using crosslinked acrylic resin with controlled tensile elongation at break (5-30%). This composition maintains dimensional stability and prevents cracking at high temperatures (≥150°C) while preserving image integrity during laser marking.
Solution Approach 2:
The multi-layer composite structure distributes thermal stress across different layers. The pigmented resin layer maintains image integrity with controlled cracking resistance, while the base layer provides structural support, enabling the laminate to withstand severe temperature conditions without image degradation.
5Reliability
If destructible layer with high brittleness is used, then tamper-proof property is improved, but attachment workability deteriorates
Solution Approach 1:
The patent assigns different mechanical properties to different layers: the destructible layer has high brittleness (tensile elongation at break <10%) for tamper-proof properties, while the base layer has high flexibility (tensile elongation at break 100-500%) to provide overall structural flexibility for attachment workability.
Solution Approach 2:
The composite laminate combines a brittle destructible layer with a flexible base layer. The brittle destructible layer provides tamper evidence when peeled, while the flexible base layer ensures the overall laminate can be attached to curved surfaces without breaking during the attachment process.
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 laminate maintains image clarity and attachment integrity at temperatures up to 150°C, preventing cracking and ensuring non-reusability after peeling, while providing good workability and conformability to curved surfaces.
Implementation Method 1
a hiding layer that absorbs laser light to generate heat and ablates
Implementation Method 2
the irradiated part of the hiding layer is removed to expose the color of the base layer
Implementation Method 3
the laminate maintains image clarity and attachment integrity at temperatures up to 150°C, preventing cracking
Data Source
AI summary
A laser-markable, acrylic resin-based laminate having a thickness of 100 to 200 μm and including (A3) a pigmented layer made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition having a hydroxyl value of 10 to 100 mg KOH/g, (B3) a base layer made of a crosslinked acrylic resin obtained by crosslinking an acrylic resin composition having a hydroxyl value of 18 to 40 mg KOH/g, and (C3) a destructible layer made of a crosslinked acrylic resin obtained by crosslinking a mixture of an acrylic resin composition having a hydroxyl value of 20 to 35 mg KOH/g and polymer beads.