Adhesive Curing Assessment Using Weighted Test Pins
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Solution Overview
Problem
Existing methods for determining the curing behavior of adhesives or sealants are subjective and lack objectivity due to variable force application during spatula tests, and previous devices fail to assess further curing properties once skin forms on the material.
Innovation Solution
A method and device where identical test bodies, such as metal pins, apply a consistent force to the adhesive or sealant bead at predetermined times, measuring the sinking depth to objectively assess curing, with a holding device guiding the pins to ensure consistent placement and simplify results interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a spatula test is performed by pressing the bead with a thin spatula at predetermined times, then the curing behavior can be assessed, but the results are subjective and vary depending on the operator's force application
Solution Approach 1:
The test body utilizes its own weight as the forcing element, eliminating the need for external force application by an operator. The test body is placed on the bead and automatically applies a consistent force equal to its weight, making the test self-executing and independent of operator skill or variability.
Solution Approach 2:
The manual mechanical action of pressing with a spatula is replaced by a passive mechanical system where the test body's weight provides the forcing element. This substitution eliminates the variability introduced by human operators while maintaining the mechanical testing principle.
2Loss of time
If levers are dipped into the material to test solidification rate, then skin formation time can be determined, but no further curing properties can be assessed once skin forms
Solution Approach 1:
Instead of directly testing the material surface which becomes inaccessible after skin formation, the invention uses a test body that copies the essential testing function by measuring deformation through the bead structure. The test body penetrates and deforms the bead material, providing continuous assessment data throughout the curing process without being blocked by surface skin formation.
3Adaptability or versatility
If multiple test bodies of different designs are used, then various curing properties can be tested, but the results become difficult to compare and interpret
Solution Approach 1:
The invention employs test bodies that are homogeneous in design and dimensions, ensuring that each test body applies the same weight and contact characteristics to the bead. This uniformity allows direct comparison of results across different time points and different adhesive formulations, as the only variable is the bead's curing state, not the test body characteristics.
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 approach provides clear, objective, and reproducible results on the curing state of adhesives or sealants, allowing for informed adjustments in composition before use, reducing variability and ensuring accurate assessments independent of operator skill.
Implementation Method 1
a test body which always applies at least approximately the same force to the bead when it is placed on it and acts on it with its weight
Implementation Method 2
the deformations of the bead caused by the test bodies are measured at a predetermined end time
Data Source
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AI summary
The invention relates to a method for determining the curing behaviour of an adhesive- or sealant bead (10), said adhesive- or sealant bead (10) being applied to a workpiece (12). Multiple test bodies (26) are placed on the adhesive- or sealant bead (10) at different, pre-defined placement times and deformations of the adhesive- or sealant bead (10), caused by the test bodies (26), are measured at a pre-defined end time.