Extruded Pre-Stretching Roller Structure for Easier Assembly
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Solution Overview
Problem
The production process of pre-stretching rollers for unwinding apparatuses is complex and laborious, leading to high costs and the need for multiple versions to accommodate different unwinding apparatuses, making them expensive and difficult to install and assemble.
Innovation Solution
A pre-stretching roller with a main body made through an extrusion process, featuring a first tubular element for film interaction and a second internal tubular element with seats for easy mounting on unwinding apparatuses, reducing machining requirements and allowing for lighter, more resistant, and versatile rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional manufacturing processes (rolling or calendering from steel sheet) are used to produce pre-stretching rollers, then the rollers achieve sufficient structural strength, but the production process becomes complex and laborious, increasing manufacturing costs
Solution Approach 1:
The patent changes the manufacturing method from traditional rolling/calendering processes to extrusion process, fundamentally altering the production parameters and approach. This enables simpler, more automated manufacturing while maintaining roller structural integrity and performance requirements
Solution Approach 2:
The patent replaces the complex multi-step mechanical rolling or calendering process with a single-step extrusion process, substituting a simpler manufacturing system that achieves the same functional result with fewer operations and less labor
2Adaptability or versatility
If multiple versions of pre-stretching rollers are produced to accommodate different unwinding apparatuses, then compatibility with various apparatuses is achieved, but production costs increase and assembly becomes more difficult
Solution Approach 1:
The patent designs the pre-stretching roller with universal mounting features (flanges with mounting holes, standardized dimensions) that enable a single roller design to be compatible with multiple different unwinding apparatuses, eliminating the need for apparatus-specific roller versions while maintaining broad adaptability
3Strength
If traditional manufacturing methods are used, then sufficient structural strength is achieved, but the rollers are heavier and more expensive
Solution Approach 1:
The patent employs composite construction by combining the extruded metallic or plastic core structure with an elastomeric material coating layer, creating a composite roller that achieves necessary structural strength and film interaction properties while reducing overall weight compared to traditional solid steel construction
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 extrusion process simplifies manufacturing, reduces production costs, and enables quick assembly and precise operation of pre-stretching rollers, making them more economical and adaptable to various unwinding apparatuses while maintaining structural integrity.
Implementation Method 1
a main body elongated along a longitudinal central axis and obtained by an extrusion process
Data Source
AI summary
A pre-stretching roller of an unwinding apparatus, associable to a wrapping machine, includes a main body elongated and manufactured by an extrusion process of a metal alloy. The main body includes a first tubular element having a cylindrical shape and defining an external cylindrical wall for interacting with a film, a second tubular element internal to the first tubular element and having a first end provided with a first seat suitable for coupling with a driving shaft of a driving unit and an opposite second end provided with a second seat suitable for coupling with a supporting pin for fixing the pre-stretching roller to the unwinding apparatus, and a plurality of longitudinal vanes which connect the first tubular element to the second tubular element. The second tubular element has a plurality of longitudinal ribs, each connected to a respective longitudinal vane.