Method and device for testing the adhesion of a body on a substrate
Inventors
Assignees
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Publication Number
US-12492981-B2
Publication Date
2025-12-09
Expiration Date
Abstract
Disclosed are a method and device for testing the adhesion of an adhesive, planar body on a planar substrate, wherein the planar body is applied adhesively on the substrate, the substrate is moistened, and a mechanical force is exerted on the substrate by means of an element in the form of a dumbbell-shaped magnetic stirring rod acting on the side of the substrate facing away from the adhesively applied body, wherein the substrate is repeatedly reversibly deformed at least in parts of the adhesive region of the planar body by means of the exertion of force, and, after a period of time, exertion of the mechanical force is ended, and the remaining adhesion of the planar body is assessed in qualitative and/or quantitative terms.
Core Innovation
A method is described for testing the adhesion of an adhesive, planar body on a substrate. The method comprises applying the planar body adhesively to the substrate, moistening the substrate, and exerting mechanical force on the substrate by means of a dumbbell-shaped magnetic stirring rod acting on the side of the substrate facing away from the body.
The dumbbell-shaped magnetic stirring rod is driven by a magnetic stirrer and rotates underneath the substrate while deforming it. The substrate is repeatedly reversibly deformed at least in parts of the adhesive region of the body, and after a period of time encompassing a predetermined load population, the mechanical loading is ended.
The remaining adhesion of the body is then assessed qualitatively and/or quantitatively. The assessment includes observing and determining edge detachment and/or determining an adhesive area fraction via mesh and transparent film or using an opaque/transparent optical contrast, and may include measuring a pull-off force as part of peel testing.
Claims Coverage
The document contains one independent claim and dependent claims that refine the loading, assessment, and device features. The inventive features focus on adhesion testing by moistening followed by repeated reversible substrate deformation using a dumbbell-shaped magnetic stirring rod rotating underneath the substrate, and on subsequent qualitative and/or quantitative remaining adhesion assessment.
Adhesion testing by moistening and repeated reversible substrate deformation with a dumbbell-shaped magnetic stirring rod
Applying an adhesive, planar body to a substrate, moistening the substrate, exerting mechanical force on the substrate by a dumbbell-shaped magnetic stirring rod acting on the side facing away from the body, and repeatedly reversibly deforming the substrate at least in parts of the adhesive region during loading by rotation of the rod under the substrate, followed by assessing qualitatively and/or quantitatively the remaining adhesion of the body after a period of time encompassing a predetermined load population.
Quantitative remaining adhesion by pull-off force comparison
Assessing remaining adhesion quantitatively by determining and comparing the pull-off force from the substrate before and after mechanical loading.
Optical/appearance-based remaining adhesion for transparent adhesive bodies
Assessing remaining adhesion quantitatively or qualitatively for a transparent adhesive, planar body by determining the proportion of opaque surface portions relative to transparent surface portions of the body.
Testing device with top-open vessel and magnetic-stirring-induced deformation
Providing a testing device with a vessel open at the top, a dumbbell-shaped magnetic stirring rod acting on the substrate to deform it during rotary and/or stirring movement, and a holding device for fixing the planar substrate over the opening while the dumbbell-shaped magnetic stirring rod rotates underneath the substrate.
Across the independent method claim and its refinements, the core coverage lies in moistening the substrate and applying repeated reversible deformation driven by a dumbbell-shaped magnetic stirring rod rotating underneath, followed by qualitative and/or quantitative evaluation of remaining adhesion using visual or optical measures and optionally pull-off force comparison, with a corresponding device configuration implementing the stirring-induced deformation.
Stated Advantages
Documented Applications
Testing adhesion of an adhesive planar body including a transdermal therapeutic system on a substrate, with an example noting no noticeable edge detachment after 24 h at 110 rpm for a specified TTS/substrate type.
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