Electrostatic Powder Coating Mold for Uniform Fiber Barrier Layers
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Solution Overview
Problem
Fiber-based hollow bodies lack effective barrier properties against external media such as water and water vapor, and existing coating methods result in uneven and patchy coatings due to manufacturing tolerances.
Innovation Solution
A device with an electrically conductive and compressible compensation element, combined with conductive segments, ensures uniform coating by adapting to manufacturing tolerances and using a spray lance to apply a polymer powder, forming a homogeneous barrier layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrostatic high-voltage method is used for powder coating, then barrier layer can be applied to the shell, but the coating has different thicknesses and gaps due to manufacturing tolerances of fiber-based bodies
Solution Approach 1:
The patent uses a flexible mold that can deform to adapt to the manufacturing tolerances of fiber-based hollow bodies. The mold includes a deformable section that flexes to maintain intimate contact with the outer surface of the hollow body, ensuring uniform electrical charge distribution and consistent coating thickness across the entire surface, thereby resolving the contradiction between achieving reliable barrier protection and maintaining coating uniformity.
2Object-affected harmful factors
If fiber-based materials are used for packaging, then sustainability is improved, but the materials lack intrinsic protection against external media such as water or water vapor
Solution Approach 1:
The patent applies a powder coating barrier layer to fiber-based hollow bodies, creating a composite structure that combines the sustainability benefits of fiber materials with the protective barrier properties of the coating. The uniform coating achieved through the flexible mold ensures complete coverage, providing reliable protection against water and water vapor while maintaining the sustainable characteristics of the fiber-based substrate.
3Ease of manufacture
If electrostatic coating is applied to fiber-based bodies with large manufacturing tolerances, then coating process can be performed, but the charge region is not uniform resulting in patchy coating
Solution Approach 1:
The flexible mold with deformable sections maintains intimate contact with the hollow body surface despite manufacturing tolerances, ensuring uniform charge distribution across the entire surface. This flexibility allows the electrostatic coating process to be applied easily while achieving uniform charge regions and eliminating patchy coating defects.
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
The device provides a uniform and gap-free barrier layer on fiber-based hollow bodies, enhancing their protection against external media and improving the rigidity of closures.
Implementation Method 1
an electrically conductive and compressible compensation element is arranged on the inner side of the mold
Implementation Method 2
The electrically conductive and compressible compensation element ensures, thanks to its flexibility, that the outer surfaces of the body, whose corresponding inner surfaces are to be coated, are in full surface contact with the compensation element
Implementation Method 3
a spray lance (15) which can be supplied with an electrical voltage and with the aid of which a polymer powder can be sprayed on the hollow body (17)
Data Source
AI summary
A device for coating fiber-based hollow bodies with a barrier layer, including an electrically conductive mold with a first port for receiving the body and including a spray lance with a second port, which spray lance can be introduced into the body and through which a polymer powder can be introduced into the body. A power source can be connected to the first and the second port, as a result of which an electric voltage can be realized between the mold and the spray lance. An electrically conductive and compressible compensation element is arranged on the inner side of the mold.