Core-Sheath Filament for Precise Adhesive Deposition
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Solution Overview
Problem
Conventional adhesive transfer tapes require die-cutting, leading to waste and limitations in precise application, especially in complex geometries, and traditional hot-melt adhesives have challenges with viscosity and stability during 3D printing processes.
Innovation Solution
The development of core-sheath filaments with a non-tacky sheath and a hot-melt processable adhesive core, containing a blend of transition metal compounds, accelerators, and curable components, which can be post-cured on a substrate using a liquid activator, allowing for precise deposition and reduced waste in adhesive application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional adhesive transfer tapes are used, then adhesive application is simple, but die-cutting waste is generated and precise application in complex geometries is limited
Solution Approach 1:
The adhesive is segmented into filament form that can be deposited layer by layer in complex geometries, eliminating the need for die-cutting entire adhesive sheets and reducing waste
Solution Approach 2:
The adhesive application transitions from 2D sheet-based die-cutting to 3D filament-based extrusion, enabling precise deposition in complex geometries and reducing material waste
2Ease of manufacture
If traditional hot-melt adhesives are used, then processing is straightforward, but viscosity and stability issues occur during 3D printing
Solution Approach 1:
The adhesive composition parameters are modified by adding transition metal compounds and curable components, enabling stable viscosity during printing and controlled curing after deposition
Solution Approach 2:
The adhesive uses a composite formulation combining polymer matrix, transition metal compounds, accelerators, and curable components to achieve both printability and stability
3Productivity
If adhesive is applied without post-curing, then process is simple, but geometric stability and substrate compatibility are reduced
Solution Approach 1:
The adhesive is pre-formulated with curable components and transition metal compounds that remain dormant during printing, then activated after deposition to achieve final geometric stability and substrate compatibility
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
Enables precise and controlled adhesive application without die-cutting waste, with improved geometric stability and flexibility in substrate compatibility, facilitating intricate bonding patterns and reduced volatile organic compounds (VOCs) in 3D printing processes.
Implementation Method 1
a hot-melt processable adhesive core, wherein the hot-melt processable adhesive core comprises a blend of: a hot-melt processable adhesive; a transition metal compound; an accelerator; and a curable component
Implementation Method 2
a curable component; and II) a primer for adhesion of the core-sheath filament to a substrate comprising: an oxidizing agent
Implementation Method 3
a primer for adhesion of the core-sheath filament to a substrate comprising: an oxidizing agent
Implementation Method 4
b) melting and mixing the core-sheath filament to form a molten composition
Data Source
AI summary
A core-sheath filament having a non-tacky sheath and a hot-melt processable adhesive core, the sheath exhibiting a melt flow index of less than 15 grams per 10 minutes, is provided. Methods of making the core-sheath filament and methods of using the core-sheath filament to print a hot-melt processable adhesive onto a primer-treated substrate surface to provide a structural bond are described.