Laser-Induced Plastic Foaming with Patterned Control
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Solution Overview
Problem
Current methods for foaming plastics lack control and precision, particularly in producing discrete, patterned surface structures, and often involve harmful chemicals or inefficient energy use.
Innovation Solution
A matrix material containing an additive that absorbs laser or IR light to locally heat and decompose a blowing agent, allowing for targeted and controlled foaming, using absorber materials and blowing agents that produce gas upon heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional foaming methods (physical, chemical, or dissolution) are used, then foaming can be achieved, but control and precision for producing discrete patterned surface structures is lacking
Solution Approach 1:
The patent replaces conventional mechanical foaming systems (gas supply equipment, extruder modifications) with a laser-based system. The laser provides non-contact, localized heating that triggers controlled foaming only in specific patterned areas, eliminating the need for complex gas supply apparatus and achieving precise spatial control of foam formation.
Solution Approach 2:
The invention applies foaming locally rather than uniformly throughout the plastic material. By using laser irradiation focused on specific patterns, the foaming occurs only in targeted discrete areas, enabling the production of patterned surface structures with precise spatial control while leaving other areas unaffected.
2Ease of manufacture
If CFC-containing blowing agents are used for easy foaming, then foaming is simplified, but environmental compatibility deteriorates
Solution Approach 1:
The patent changes the triggering parameter for foaming from thermal decomposition of chemical blowing agents to laser-induced localized heating. This allows the use of environmentally friendly blowing agents (replacing CFCs) while maintaining controlled foaming through laser activation, thus improving environmental compatibility without sacrificing foaming effectiveness.
3Productivity
If chemical blowing agents are used for foaming, then foaming can be triggered, but harmful substances and environmental damage are produced
Solution Approach 1:
The invention extracts the harmful chemical decomposition step from the foaming process by using laser heating to directly activate the blowing agent. This separation allows the use of safer, environmentally compatible blowing agents that do not decompose into harmful substances, thereby eliminating the production of harmful chemicals while maintaining foaming productivity.
4Manufacturing precision
If laser irradiation is used for localized heating, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical foaming control systems with a laser-based thermal control system. The laser provides precise spatial and temporal control of heating, enabling accurate patterned foaming without the need for complex gas supply equipment, sensors, and mechanical actuators required by conventional systems.
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
Enables precise, controlled foaming of plastics, allowing for the creation of patterned structures and improved energy efficiency, while avoiding the use of harmful chemicals and reducing environmental impact.
Implementation Method 1
a) at least one absorber material which, embedded or dissolved in the matrix material, absorbs laser light or IR light and brings about local heating in the matrix material at the site of the irradiation
Implementation Method 2
b) at least one blowing agent which, when heated due to the irradiation with laser light or IR light to temperatures above 50° C., produces, by decomposition, chemical conversion or reaction, a gas foaming the matrix material
Data Source
AI summary
A matrix material composed of polymer, preferably of thermoplastic polymer, or coating material. The matrix material includes 0.01 to 50% by weight of an additive for foaming of the matrix material which can be triggered by irradiation with laser light or IR light. The additive includes at least the following constituents: a) at least one absorber material which, embedded or dissolved in the matrix material, absorbs laser light or IR light and brings about local heating in the matrix material at the site of irradiation with laser light or IR light, and b) at least one blowing agent which, when heated due to the irradiation with laser light or IR light to temperatures above 50° C., forms a gas which foams the matrix material by decomposition, chemical conversion or reaction.