Solventless Adhesive for High-Speed Coating Multilayer Film
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Solution Overview
Problem
Conventional solventless adhesives used in multi-layered films for packaging containers exhibit low laminate strength and impact resistance, especially when applied at high coating speeds, and are not environmentally friendly due to the use of VOCs and solvents.
Innovation Solution
A multi-layered film is developed using a solventless adhesive composed of a polyester-based main agent and aliphatic and alicyclic isocyanate curing agents, with specific viscosity and molecular weight ranges to ensure high-speed coating and improved laminate strength and impact resistance, while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a polyether-based solventless adhesive is used, then high-speed coating property is improved, but laminate strength and impact resistance deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive by using a polyester-based main agent with specific molecular weight range (500-2000) and combining it with a polyisocyanate curing agent. This parameter optimization enables the adhesive to maintain appropriate viscosity at high coating speeds while achieving sufficient laminate strength and impact resistance after curing.
2Object-affected harmful factors
If a conventional solventless adhesive is used, then environmental friendliness is improved by removing VOCs, but laminate strength and impact resistance deteriorate
Solution Approach 1:
The patent creates a composite adhesive system by combining a polyester-based main agent with a polyisocyanate curing agent. This composite formulation eliminates VOCs by being solventless while the chemical reaction between the two components forms a strong crosslinked network that provides both laminate strength and impact resistance.
3Productivity
If coating speed is increased to 150m/min, then productivity is improved, but adhesive wetting becomes insufficient causing defective appearance and reduced laminate strength
Solution Approach 1:
The patent optimizes the viscosity parameter of the adhesive by selecting a polyester main agent with molecular weight of 500-2000. This viscosity optimization ensures that the adhesive can be applied at high speeds (150m/min) while still maintaining adequate wetting of the substrate, preventing defective appearance and ensuring proper adhesion.
4Ease of operation
If a solvent adhesive is used, then ease of application is improved, but environmental contamination increases due to solvent evaporation
Solution Approach 1:
The patent extracts and removes the solvent component from the adhesive formulation, transitioning from a solvent-based system to a solventless system. This extraction eliminates harmful solvent evaporation and VOC emissions while the adhesive remains applicable through the chemical reactivity of the polyester and polyisocyanate components.
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 film achieves excellent laminate strength and impact resistance even at high coating speeds, reducing environmental impact by eliminating VOCs and solvent use, making it suitable for packaging liquids like detergents and beverages.
Implementation Method 1
a multi-layered film which is formed by laminating at least an inner-layer film, an adhesive layer and an outer-layer film in order, wherein the adhesive layer is formed of a solventless adhesive which contains a polyester-based main agent and a curing agent made of aliphatic isocyanate and alicyclic isocyanate
Data Source
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AI summary
A multilayered film which is formed using a solventless adhesive, can obviate wetting deficiency even when the film is manufactured by applying the solventless adhesive to a film by coating at a high speed, exhibits the excellent laminate strength and the excellent impact resistance after a liquid content is filled into a packaging container and exhibits excellent environment friendliness, a method of manufacturing the multilayered film, and a packaging container which uses the multilayered film are provided. In the multilayered film which is formed by laminating at least an inner-layer film, an adhesive layer and an outer-layer film in order, the adhesive layer is formed of a solventless adhesive which contains apolyester-based main agent and a curing agent made of aliphatic isocyanate and alicyclic isocyanate.