Solution-Based ALD Coatings on Flexible Polyolefin Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The packaging industry seeks high oxygen and moisture barrier films that are cost-effective, recyclable, and transparent, replacing aluminum foil, but existing technologies like vapor deposition and nanoclay coatings are economically unviable or complex.
Innovation Solution
A solution-based atomic layer deposition (ALD) process using self-limiting precursors and solvents to apply thin inorganic or inorganic-hybrid coatings on polymeric films, allowing for tunable barrier properties through multiple layer deposition and ambient curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vapor deposition or nanoclay coatings are used to achieve high oxygen and moisture barrier performance, then barrier performance is improved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The invention changes the deposition parameters by using solution-based precursors instead of vapor phase, enabling deposition at lower temperatures and with simpler equipment. The use of dissolved metal salts in solvents allows for controlled deposition without complex vacuum systems, resolving the contradiction between achieving high barrier performance and maintaining process simplicity
Solution Approach 2:
The invention replaces the mechanical vapor deposition system with a chemical solution-based system. Instead of using vacuum chambers and vapor transport, the process uses liquid precursor solutions that are applied to the substrate and then cured, substituting complex mechanical deposition equipment with simpler application and curing steps
2Reliability
If vapor deposition or nanoclay coatings are used to achieve high oxygen and moisture barrier performance, then barrier performance is improved, but manufacturing cost increases
Solution Approach 1:
The invention uses inexpensive metal salt precursors dissolved in common solvents instead of expensive vapor deposition materials. The precursors are applied as simple solutions and cured to form the barrier coating, eliminating the need for costly vacuum deposition equipment and specialized materials, thereby reducing manufacturing cost while maintaining barrier performance
Solution Approach 2:
The invention changes the material state from vapor phase to solution phase, enabling the use of cheaper precursors and simpler processing equipment. This parameter change allows for cost-effective production of high-performance barrier coatings without requiring expensive vapor deposition infrastructure
3Reliability
If conventional ALD processes are used to produce thinly coated packaging film, then high barrier performance is achieved, but capital cost and process complexity increase
Solution Approach 1:
The invention replaces the conventional vapor-phase ALD mechanical system with a solution-based chemical deposition system. Instead of using vacuum pumps, heated chambers, and vapor transport mechanisms, the process uses liquid precursor application followed by curing, dramatically simplifying the equipment requirements while maintaining the self-limiting deposition mechanism that provides high barrier performance
Solution Approach 2:
The invention introduces a solvent as an intermediary carrier for the metal precursor. The solvent dissolves the metal salt and delivers it to the substrate surface in a controlled manner, enabling uniform coating deposition without requiring complex vapor phase control systems. This intermediary approach simplifies the deposition process while maintaining coating 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
The process produces flexible films with high oxygen and moisture barrier performance at a lower cost, maintaining transparency and recyclability, while being economically viable and simpler in process complexity compared to existing methods.
Implementation Method 1
at least a portion of the dissolved self-limiting precursor attaches to the facial surface of the film
Implementation Method 2
Curing the attached self-limiting precursor by contact with oxygen
Data Source
AI summary
Conventional atomic layer deposition technology is modified to increase its cost-effective viability for use in producing thinly coated flexible packaging film. In one embodiment a thinly coated flexible substrate, e.g., a polyolefin film, is made by a process comprising the steps of: (A) Dissolving a self-limiting precursor in a solvent to form a solution of dissolved self-limiting precursor in the solvent, (B) Applying the solution to a facial surface of a flexible polymer film so that at least a portion of the dissolved self-limiting precursor attaches to the facial surface of the film and the solution is at least partially depleted of self-limiting precursor, and (C) Curing the attached self-limiting precursor by contact with oxygen.