Nozzle Adhesive Dispersion Viscosity Control
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Solution Overview
Problem
Nozzle application systems for dispersion adhesives in high-speed applications experience contamination due to cone-shaped deposits forming at the nozzle exit, leading to precision variations and machine downtimes, as the adhesive is exposed to high shear forces and short formation times, resulting in satellite drops and significant build-up.
Innovation Solution
Using an aqueous vinyl ester polymer dispersion stabilized with emulsifiers, with a solids content of at least 40% by weight and viscosity less than 8000 mPas, applied through nozzles as a thin jet or sections of jets, which reduces contamination build-up and maintains bonding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nozzle application system is used for high-speed adhesive application, then productivity and adaptability are improved, but contamination build-up on nozzle occurs leading to precision degradation
Solution Approach 1:
The patent changes the physical-chemical parameters of the adhesive, specifically its viscosity and surface tension, to optimize performance for nozzle application. The adhesive is formulated with a viscosity of 100-8000 mPas and specific surface tension characteristics that prevent satellite drop formation and contamination build-up during high-speed application, thereby maintaining precision while enabling high productivity
Solution Approach 2:
The patent uses composite adhesive formulations combining polyvinyl ester polymers with specific emulsifiers and additives. This composite structure provides both the required bonding performance and the rheological properties necessary for clean nozzle application at high speeds, preventing contamination while maintaining application precision
2Productivity
If high cycle frequency nozzle operation is used, then productivity is improved, but satellite drops and contamination build-up increase
Solution Approach 1:
The adhesive formulation is optimized with specific viscosity (100-8000 mPas) and surface tension parameters that remain stable under high shear conditions. This prevents the formation of satellite drops during rapid valve cycling and minimizes contamination build-up on the nozzle, enabling sustained high-frequency operation without degradation
Solution Approach 2:
The patent develops an adhesive formulation that is economically optimized for high-volume, short-duration application cycles. The adhesive is designed to be used in small quantities per application event but at very high frequencies, with the formulation specifically engineered to prevent cumulative contamination that would otherwise require frequent nozzle cleaning or replacement
3Object-generated harmful factors
If adhesive viscosity is increased to reduce satellite drops, then contamination is reduced, but application precision and nozzle running properties deteriorate
Solution Approach 1:
The patent identifies and optimizes specific parameter ranges for the adhesive, including viscosity (100-8000 mPas), surface tension, and solids content (at least 40% by weight). These parameters are carefully balanced to prevent satellite drop formation while maintaining precise jet formation and good nozzle running properties, avoiding the trade-off between contamination reduction and application precision
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
Significantly reduces contamination build-up on the nozzle, minimizing system downtimes, with build-up reduced to less than 1 mm after two hours, while maintaining excellent nozzle running properties and bonding performance.
Implementation Method 1
an aqueous vinyl ester polymer dispersion stabilized by emulsifiers with a solids content of at least 40% by weight and a viscosity of less than 8000 mPas
Implementation Method 2
stabilized by emulsifiers
Implementation Method 3
from the nozzle in the form of a thin jet or sections of thin jets is applied to the substrate
Data Source
AI summary
Application of dispersion adhesive on a substrate by nozzles, comprises providing an aqueous polymer dispersion stabilized by emulsifying agents, with a solid content of at least 40 wt.%, a viscosity of less than 8000 mPas to the nozzle; and applying a fine ray or a predetermined fine ray in a discontinuous manner, from the nozzle on the substrate, where the polymer exhibits a glass transition temperature of - 30[deg] C to + 40[deg] C. An independent claim is included for an aqueous, emulsifying agent containing polymer dispersion with a solid content of at least 40 wt.% and a viscosity of less than 8000 mPas, where the polymer exhibits a glass transition temperature of - 30[deg] C to +40[deg] C, for nozzle application on substrates.