Thermally Decoupled Coating Beam for Web Uniformity
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Solution Overview
Problem
Existing surface coating technologies face challenges in achieving uniform coating thickness and accuracy due to thermal influences and mechanical loads, leading to curvature of the supporting beam and suboptimal coating quality.
Innovation Solution
The implementation of a thermally decoupled application mechanism using rib-shaped elements and an annular gap with a forced flow, where the heat transfer coefficient on the inner wall is significantly higher than on the outer wall, allowing for effective thermal deflection compensation and minimizing heat conduction from the coating device to the support beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the supporting beam is made robust to carry the application device, then the mechanical strength is improved, but the thermal expansion and curvature increase due to thermal influences
Solution Approach 1:
The supporting beam is divided into multiple segments that can move independently relative to each other. Each segment is connected through sliding connections that allow thermal expansion and curvature while maintaining the overall structural integrity and load-bearing capacity of the beam.
Solution Approach 2:
The supporting beam transitions from a static rigid structure to a dynamic system where segments can slide relative to each other. This dynamic capability allows the beam to accommodate thermal influences and maintain straightness while still providing mechanical support for the application device.
2Measurement precision
If the application device is rigidly fixed to the supporting beam, then the positioning accuracy is improved, but the thermal influences from the application device affect the supporting beam
Solution Approach 1:
A thermal insulation layer is introduced as an intermediary between the application device and the supporting beam. This insulation layer reduces thermal influence transfer while allowing the application device to be positioned accurately on the supporting beam structure.
Solution Approach 2:
The mounting structure is segmented into separate components that allow thermal decoupling. The application device is mounted on insulated supports that are separate from the main supporting beam, enabling independent thermal expansion and minimizing heat transfer to the beam.
3Object-affected harmful factors
If thermal insulation is added between the application device and supporting beam, then the thermal influence is reduced, but the device complexity increases
Solution Approach 1:
The thermal insulation function is merged with the existing mounting structure of the application device. The insulation elements are integrated into the support brackets and mounting components, eliminating the need for separate insulation layers and reducing overall structural complexity.
Solution Approach 2:
Thin film insulation materials are used instead of bulky insulation structures. These thin film insulation elements provide effective thermal isolation while minimizing the addition of volume and structural complexity to the mounting system.
4Area of stationary object
If the supporting beam is made longer to cover more width, then the coverage area is improved, but the thermal curvature increases
Solution Approach 1:
The supporting beam is segmented into multiple sections that can independently respond to thermal influences. This segmentation allows each section to expand or contract locally without causing curvature across the entire length, enabling longer coverage width while maintaining straightness.
Solution Approach 2:
The supporting beam system becomes dynamic with sliding connections between segments. This dynamic capability allows the beam to accommodate thermal expansion and maintain its straight configuration across extended lengths, preventing the development of thermal curvature.
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 solution ensures a uniform temperature along the supporting beam, reducing curvature and enhancing the accuracy and uniformity of the surface coating, while simplifying the mechanical design and reducing maintenance costs.
Implementation Method 1
A forced flow is formed in the annular gap, which is dimensioned in such a way that the heat transfer on an inner wall of the outer tube is greater than the heat transfer on the outer wall of the outer tube
Implementation Method 2
These rib-shaped elements support the coating device in such a way that the force of the coating device, in particular of the nozzle, which is made up of the weight and operating force, can be transmitted predominantly via pressure forces
Data Source
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AI summary
Coating system for the direct or indirect application of a coating medium onto a moving web of material, in particular paper or cardboard, comprising a support beam (1) for guiding and positioning an elongated coating device for dispensing coating medium across a machine width, wherein the support beam (1) comprises an outer tube having an outer wall and an inner wall with an inner tube arranged therein for the purpose of thermal deflection compensation, wherein a fluid-filled space is formed between the outer and inner tubes, wherein the coating device is thermally decoupled and supported on the support beam (1), for which purpose a plurality of individual, spaced-apart rib-shaped elements (12, 13) are attached to the support beam (1), each of which has at least two support elements (14, 15) for a load distribution of at least 70% between the weight force and the operating force of the elements (12, 13) on the rib-shaped elements (14, 15).13) have a mounted coating device.