Laminator Adhesive Delivery System for Short Pot Life Polyurethane
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Solution Overview
Problem
Current laminating technologies face challenges with polyurethane adhesives having short pot life due to limitations in material delivery systems, which result in inconsistent laminate production, increased viscosity, and productivity losses, as they struggle with precise flow control and efficient mixing of components with significant viscosity differences and extreme mixing ratios.
Innovation Solution
A process involving separate reactant storage tanks, high-speed mixing (1000 rpm to 8000 rpm) for less than 60 seconds, followed by precise dispensing through a nozzle, and an automatic cleaning system using solvents to manage adhesive flow and cleanliness between rolls, allowing for minimal residence time and efficient cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If polyurethane adhesives with short pot life are used, then curing speed and bond development are improved, but viscosity increases rapidly causing inconsistent laminate production
Solution Approach 1:
The material delivery system is segmented into separate reactant storage tanks with individual metering pumps, allowing independent control of each component's flow rate. This enables precise dosing of isocyanate and polyol reactants separately, preventing premature reaction and viscosity buildup while maintaining fast curing performance.
Solution Approach 2:
The patent replaces traditional mechanical mixing systems with a static mixer that relies on fluid dynamics and flow patterns rather than mechanical agitation. This substitution eliminates the complexity of mechanical mixers while achieving thorough mixing of components with extreme viscosity differences through carefully designed flow channels and mixing elements.
2Manufacturing precision
If polyurethane adhesives with extended pot life are used, then laminate production consistency is improved, but curing speed and bond development are slowed
Solution Approach 1:
The patent changes the flow rate parameters of the reactants through precisely controlled metering pumps, maintaining optimal mixing ratios while minimizing residence time in the delivery system. By adjusting flow rates dynamically, the system achieves both consistent laminate production and fast curing by preventing premature reaction.
3Device complexity
If traditional material delivery systems are used, then device complexity is reduced, but flow control precision and mixing efficiency are insufficient
Solution Approach 1:
The patent extracts the mixing function from the material delivery system by using a static mixer that operates passively through flow patterns rather than requiring active mechanical components. This extraction simplifies the overall system while improving flow control precision through separate metering pumps for each reactant.
Solution Approach 2:
The static mixer acts as an intermediary element between the separate reactant delivery systems and the lamination process. It provides the necessary mixing function without requiring complex mechanical systems, using instead carefully designed flow channels that achieve thorough mixing of components with extreme viscosity differences.
4Quantity of substance
If excessive amount of adhesive is applied between rolls, then coating coverage is ensured, but residence time increases causing viscosity buildup
Solution Approach 1:
The patent implements dynamic control of adhesive application through programmable metering pumps that can adjust flow rates in real-time. This dynamic system ensures adequate coating coverage while minimizing the amount of adhesive held between rolls, thereby reducing residence time and preventing viscosity buildup.
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 process enables the use of polyurethane adhesives with shorter pot life in laminating applications by ensuring consistent and efficient adhesive delivery, reducing viscosity issues and improving productivity through precise flow control and automatic cleaning, thereby enhancing conversion efficiency and reducing defects.
Implementation Method 1
contacting the reactants with a mixer having a mixing speed in the range of from 1000 rpm to 8000 rpm and mixing the reactants in the mixer for less than 60 seconds to form mixed product
Implementation Method 2
dispensing mixed product from the dispensing nozzle between the two rolls
Implementation Method 3
releasing a first solvent from a first solvent storage container; contacting the first solvent with the mixer
Data Source
Figure 1
Figure 2
AI summary
A process for the delivery of material to rolls of a laminator is disclosed.