Rheometer Sample Trimming Blade for Edge Effect Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rheological measurements of highly viscous and solid samples, such as asphalt or polymer samples, face reproducibility issues due to manual stripping methods that introduce temperature, angle, and pressure variability, leading to edge effects that falsify measurement results.
Innovation Solution
An automated method and device for stripping samples using a cutting blade with a controlled rotational movement relative to the rheometer plates, ensuring a reproducible sample geometry by clamping the sample between plates and using a stripping tool with a cutting edge at a specific angle, moving in a circular rotation to trim protruding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual stripping methods are used to trim samples, then the operation is simple and device complexity is low, but the reproducibility and manufacturing precision of sample edges deteriorate due to variability in manual operations
Solution Approach 1:
The sample itself performs the trimming action by being subjected to controlled rotational movement between the plates, with the cutter blade positioned to automatically trim protruding portions as the sample is compressed and rotated, eliminating the need for separate manual trimming operations
Solution Approach 2:
The manual mechanical trimming operation is replaced by an automated system where the rheometer's rotational mechanism and controlled compression work together with a fixed cutter blade to automatically trim samples, converting manual precision requirements into automated mechanical control
2Measurement precision
If automated stripping tools are introduced to improve reproducibility, then measurement precision and reliability improve, but device complexity increases due to additional components and control mechanisms
Solution Approach 1:
The rheometer's existing rotational and compression mechanisms are made multi-functional by using them to both prepare and trim samples during the standard measurement procedure, eliminating the need for separate trimming devices while improving measurement reproducibility
Solution Approach 2:
The sample trimming function is merged with the sample preparation and measurement process by positioning the cutter blade within the existing plate geometry, allowing trimming to occur automatically as part of the standard rheological test procedure
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
Minimizes edge effects, enhances reproducibility and comparability of measurements, and automates the trimming process, improving the reliability of rheological property determination in plate/plate rheometers.
Implementation Method 1
moving the plates of the rheometer and the cutting of the cutting blade relative to one another in rotation in a circle with respect to one another in at least one full circumferential circular rotational movement in order to strip a protruding portion of the sample material
Data Source
AI summary
A method and device allow automatic trimming of samples for the measurement of the rheological properties of material samples by way of a plate/plate rheometer. In order to strip the protruding portion of the material sample arranged between the plates that projects over the circular circumferential edges of the rheometer plates—a cutting edge, which at its setting angle with respect to the tangent is pressed against the circular circumferential edge of the plates at the line of contact and pertains to the blade of the stripping tool that is stayed, in particular articulated, by means of a holding strut at a holding point of a holding block, and the plates of the rheometer —relative to each other—are moved in rotation in a circle with respect to each other in at least a fully circumferential circular rotational movement, wherein the circular rotational movement is guided in such a way that the real or virtual relative rotational advance of the cutting edge of the stripping-tool blade is effected counter to the virtual or real circumferential circular rotational advance respectively of the rheometer plates.