Heated Embossing Roll Groove Recesses Temperature Control
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Solution Overview
Problem
Existing heatable rollers for processing web-like materials face challenges in temperature controllability, with significant temperature fluctuations and inefficiencies in heat transfer, leading to inconsistent embossing results and reduced service life.
Innovation Solution
A heatable roller design featuring a hollow-cylindrical roller body with groove-shaped recesses for electrical heating elements, where each heating element is in thermally conductive contact with the roller body, and heating zones are arranged axially with offset connections, allowing for precise temperature control and uniform heating without the need for convection fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic heating elements are applied to the roller shell by tensioning straps, then the roller can be heated, but temperature constancy is poor with fluctuations of 15 K at start and stop
Solution Approach 1:
The roller shell is divided into multiple heating zones along the axial direction, with each zone having its own heating element. This segmentation allows independent temperature control of different zones, improving overall temperature constancy and enabling compensation for temperature gradients that occur during start and stop operations.
Solution Approach 2:
Different heating zones can have different heating powers and temperature settings according to local requirements. The groove-shaped recesses are distributed at different positions with different depths, allowing localized optimization of heat transfer and temperature control for each zone.
2Use of energy by stationary object
If heating elements are arranged in the interior of the hollow roller parallel to the axis, then the roller can be heated, but heat transfer efficiency is low requiring convection fluids
Solution Approach 1:
The heating elements are extracted from the interior of the hollow roller and placed in groove-shaped recesses on the outer surface of the roller shell. This eliminates the need for convection fluids inside the roller while improving heat transfer efficiency, as the heating elements are directly exposed to the material being processed.
Solution Approach 2:
The groove-shaped recesses act as intermediaries between the heating elements and the roller shell. They provide direct thermal contact between the heating elements and the roller surface, enabling efficient heat transfer without requiring convection fluids as a mediator.
3Use of energy by stationary object
If heating elements are placed in groove-shaped recesses in the inner wall, then heat transfer to the roller body is improved, but mechanical and electrical installation costs increase
Solution Approach 1:
Instead of placing heating elements in the inner wall of the hollow roller, the invention inverts the arrangement by placing them in groove-shaped recesses on the outer surface of the roller shell. This inversion simplifies installation and maintenance while achieving the same heat transfer effect.
Solution Approach 2:
The groove-shaped recesses are designed to automatically guide and secure the heating elements during assembly. The complementary shapes of the grooves and heating element mounting portions enable self-alignment and secure fixation without requiring additional mounting aids or complex installation procedures.
4Reliability
If heating elements are securely fixed in the roller body, then reliability is improved, but ease of mounting and replacement is reduced
Solution Approach 1:
The heating elements are mounted on the outer surface of the roller shell rather than being embedded in the inner wall. This inversion allows secure fixation through the groove-shaped recesses while enabling easy access for mounting and replacement without disassembling the roller structure.
Solution Approach 2:
The groove-shaped recesses are designed to automatically guide and secure the heating elements during assembly. The complementary shapes enable self-alignment and secure fixation without requiring additional mounting aids, making the process both reliable and easy to perform.
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 design achieves improved temperature constancy, reduced overheating, and increased service life, with enhanced embossing results and energy efficiency, as well as the ability to create specific temperature profiles for various materials.
Implementation Method 1
the heating element being in thermally conductive contact with the roller body
Implementation Method 2
the heating elements being electrical heating elements
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A heatable roll is described, in particular for processing web-like materials, having a hollow-cylindrical roll body. In the inner wall, the roll body (10) has a groove-shaped recess (13n) for receiving at least one heating element (13), wherein the heating element (13) is in thermally conducting contact with the roll body (10).