Thermal roller and producing process
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Solution Overview
Problem
Thermal rollers with spiral heat-exchange chambers face issues of rust formation, complex and expensive production processes, and thermal inhomogeneity due to undefined fluid paths, which affect thermal distribution and durability.
Innovation Solution
A thermal roller design featuring a cylindrical body with a concentric inner and outer tubular element, a plastic coating layer with helical ribs forming the heat-exchange chamber, and a simplified production process using plastic coating and shaping techniques to create a helical channel without complex fastening elements, ensuring even thermal distribution and preventing rust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a spiral heat-exchange chamber is used, then thermal homogeneity is improved, but the structure becomes more complex and production cost increases
Solution Approach 1:
The patent merges the heat-exchange chamber and the spiral channel into a single integrated component made of plastic material. The spiral channel is formed directly within the heat-exchange chamber body through injection molding, eliminating the need for separate spiral elements and complex fastening structures. This integration maintains the thermal homogeneity benefits of spiral flow paths while significantly simplifying the overall device structure and reducing production complexity.
Solution Approach 2:
The patent uses plastic material for the heat-exchange chamber, combining it with metal end caps and spiral elements. The plastic material provides corrosion resistance and allows for integrated manufacturing of complex spiral geometries, while metal components provide structural strength and thermal conductivity where needed. This composite approach enables the spiral channel configuration for thermal homogeneity without the rust and complexity issues of all-metal constructions.
2Temperature
If a spiral heat-exchange chamber with multiple windings is used, then thermal distribution evenness is improved, but rust formation and corrosion increase
Solution Approach 1:
The patent employs plastic material for the heat-exchange chamber body containing the spiral channel, replacing traditional metal constructions. This plastic material is inherently resistant to rust and corrosion while maintaining the spiral flow path configuration necessary for even thermal distribution. The composite structure combines plastic corrosion resistance with metal components only where structural strength is required, eliminating the rust formation problem while preserving thermal performance.
Solution Approach 2:
The patent changes the material parameter from metal to plastic for the heat-exchange chamber, fundamentally altering the chemical properties to resist corrosion and rust. This material substitution maintains the geometric parameters of the spiral channel for thermal performance while changing the material composition to eliminate rust formation, thereby improving reliability in corrosive environments.
3Manufacturing precision
If a spiral heat-exchange chamber with strict tolerances is used, then coupling precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the heat-exchange chamber and spiral channel into a single monolithic component manufactured through injection molding. This integration eliminates the need for separate parts that require precise coupling and fastening. The spiral channel is formed as an integral feature of the chamber body, removing assembly steps and reducing the need for strict tolerances between separate components, thereby simplifying manufacturing while maintaining precision where critical.
Solution Approach 2:
The patent incorporates the spiral channel geometry directly into the injection molding tooling, forming the precise spiral path and coupling features during the initial manufacturing process. This preliminary formation of precise geometries during molding eliminates the need for subsequent precision machining or assembly operations, achieving high coupling precision through the molding process itself rather than through complex post-processing or assembly of multiple precision parts.
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 solution provides a cost-effective, rust-resistant thermal roller with improved thermal homogeneity and simplified assembly, maintaining even thermal distribution and reducing production complexity while ensuring effective heat transfer.
Implementation Method 1
Heat transfer mainly happens by conduction, i.e. by contact between the film and the roller
Implementation Method 2
The thermal fluid in the heat-exchange chamber is forced to follow the helical path. The helical path of the thermal fluid allows a homogeneous flow of the fluid itself
Implementation Method 3
said at least one heat-exchange chamber being realized at least partially in said coating layer
Data Source
AI summary
A thermal roller (1) includes: a cylindrical body (2) extending along a longitudinal direction (X-X), the cylindrical body (2) including at least one inner tubular element (3) and at least one outer tubular element (4) that is concentrically arranged around the inner tubular element (3), the inner tubular element (3) includes an outer diameter d and the outer tubular element 4 includes an inner diameter D, being D>d; two hubs (6), each arranged at one end of the cylindrical body (2); at least one heat-exchange chamber (10) realized between the inner tubular element (3) and the outer tubular element (4). The roller includes: a coating layer (11) for the inner tubular element (3) made of plastics, and at least one helical channel (13) between the coating layer (11) and the outer tubular element (4). The helical channel (13) is realized at least partially in the coating layer (11).