Segmented Rotational Mould Heating for Uniform Surface Temperature
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Solution Overview
Problem
Existing rotational moulding technologies face challenges in efficiently heating the mould surface with elongated electrical resistances, which are costly, complex to manufacture and maintain, and result in non-uniform temperature distribution.
Innovation Solution
A mould with removably fixed, spatially separated heating elements comprising a thermally conductive base body, electrically insulating layer, and resistive track, allowing for efficient and uniform heating without mechanical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If elongated electrical resistances are used for heating the mould surface, then heating function is achieved, but manufacturing complexity and maintenance cost increase
Solution Approach 1:
The continuous elongated electrical resistance is divided into multiple discrete heating elements that are distributed onto the mould surface. Each heating element operates independently and can be replaced individually, simplifying maintenance and reducing overall system complexity while maintaining effective heating coverage.
2Temperature
If elongated electrical resistances are housed interlocked in grooves, then direct thermal contact is achieved, but maintenance requires replacement of the whole resistance
Solution Approach 1:
The heating system is segmented into multiple independent heating elements distributed on the mould surface. Each element can be individually accessed, removed, and replaced without affecting the others, enabling localized maintenance while preserving temperature uniformity through coordinated operation of all elements.
Solution Approach 2:
The heating elements are designed to be removably fixed rather than permanently embedded, allowing dynamic adjustment and replacement. This enables maintenance personnel to access and replace individual elements as needed, improving ease of repair while maintaining thermal contact through the removable fixing mechanism.
3Temperature
If fluid ducts are made for thermal regulation, then temperature control is improved, but manufacturing complexity increases
Solution Approach 1:
The thermal regulation function is extracted from the mould structure itself and implemented through separate, removable heating elements. This eliminates the need for complex internal fluid ducts embedded in the mould, simplifying mould manufacturing while maintaining effective temperature control through the modular heating element system.
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 simplifies the fixing and maintenance of heating elements, reduces manufacturing and maintenance costs, and achieves uniform temperature distribution across the mould surface.
Implementation Method 1
an electrically resistive track made on said electrically insulating layer
Implementation Method 2
a thermally conductive base body in thermal contact with said outer surface of the main body
Data Source
AI summary
Mould (99) for rotational moulding comprising a main body (90) having an inner cavity (91) and an outer surface (92), a plurality of heating elements (1) distinct from each other and removably fixed to the main body (90) in distributed way onto the outer surface (92), each heating element (1) comprising a thermally conductive base body (2) in thermal contact with the outer surface (92), an electrically insulating layer (6) adhered to the base body (2) at opposite side to the outer surface (92), an electrically resistive track (7) made on the electrically insulating layer (6), wherein the base bodies (2) are spatially separated from each other.