Dual Pump Adhesive Applicator for Viscosity Stability
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Solution Overview
Problem
Conventional pump-driven applicator systems struggle to reliably apply high-viscosity two-part polyurethane adhesives on roofing substrates due to temperature sensitivity and viscosity changes, leading to inconsistent adhesive performance.
Innovation Solution
A pump-driven applicator system with a prime mover, gearbox, and dual pumps connected to accumulators and manifolds, which ensures consistent delivery of isocyanate and polyol blends, forming a polyurethane adhesive with a configuration that prevents moisture exposure and maintains viscosity stability, allowing for high-viscosity adhesive application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-viscosity adhesive is used to account for temperature effects, then adhesive performance is improved, but pump-driven applicator systems are unable to reliably pump the adhesive
Solution Approach 1:
The adhesive system is divided into two separate components (isocyanate blend and polyol blend) that are stored separately and mixed only at the point of application. This segmentation allows each component to maintain its own viscosity characteristics suitable for pumping, while the final mixed adhesive achieves the desired high-viscosity performance characteristics.
Solution Approach 2:
The two adhesive components are prepared and stored separately in advance with viscosity formulations optimized for pumping operations. By performing the mixing action at the point of application rather than in advance, the system maintains pumpability of individual components while achieving high-viscosity adhesive performance when needed.
2Adaptability or versatility
If conventional two-part polyurethane adhesives are used, then adhesive composition is flexible, but viscosity changes with temperature leading to inconsistent application
Solution Approach 1:
The system changes the formulation parameters of the two separate adhesive components to have complementary viscosity characteristics. The isocyanate blend and polyol blend are formulated with viscosities that remain relatively stable across temperature ranges, and their mixing ratio is controlled to produce a final adhesive with consistent rheological properties regardless of ambient temperature.
Solution Approach 2:
The pump-driven applicator system incorporates flow meters and pressure sensors that monitor the viscosity and flow characteristics of the adhesive components in real-time. This feedback allows the system to automatically adjust pumping rates and mixing ratios to compensate for temperature-induced viscosity changes, maintaining consistent application 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 system effectively applies two-part polyurethane adhesives across a wide temperature range with minimal viscosity change, ensuring reliable adhesion on roofing substrates and accommodating varying environmental conditions.
Implementation Method 1
Upon mixing, the isocyanate blend reacts or crosslinks with the simple polyol blend to form the polyurethane adhesive
Data Source
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AI summary
A system and method for applying a two-part adhesive to a substrate includes a prime mover (30) for providing an output torque, a first pump (36A) connected to the prime mover (30) for receiving the output torque, the first pump (36A) having an inlet (38A) and an outlet (38B), a second pump (36B) connected to the prime mover for receiving the output torque, the second pump (36B) having an inlet (40A) and an outlet (40B), a first compound in communication with the inlet of the first pump, a second compound in communication with the inlet of the second pump, a first accumulator (50A) in communication with the outlet of the first pump, a second accumulator (50B) in communication with the outlet of the second pump, a first manifold (52A) in communication with the outlet of the first pump, and a second manifold (52B) in communication with the outlet of the second pump.