Two-Part Support Rod for Coreless Roll Insertion and Locking
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Solution Overview
Problem
Existing support bars for coreless rolls, such as paper rolls, face difficulties in attachment and insertion due to extended ribs that can damage the innermost turns of the material web, especially when uniform winding is lacking, leading to potential tearing or getting caught.
Innovation Solution
A two-part support rod design where the first part with shorter ribs is easily inserted into the coreless roll, and the second part, a sleeve with ribs, is then pushed onto the first part, locking in place non-detachably, with features like an annular bead and perpendicular surface for secure locking, and optional additional parts like a third bearing pin for mechanical coding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support rod has extended ribs over the entire length, then the roll is supported and guided in the dispenser, but the ribs can tear open the innermost turns of the material web or get caught in it
Solution Approach 1:
The support rod is divided into multiple sections along its length, with ribs present only in specific zones (outer sections) rather than continuously. This segmentation allows the ribs to provide support where needed while avoiding the innermost turns of the material web during insertion and operation.
Solution Approach 2:
The ribs are positioned locally at specific sections of the support rod (outer sections) rather than uniformly across the entire length. This local placement provides structural support and guidance functionality in critical areas while leaving the central insertion area clear to prevent damage to the material web.
2Ease of operation
If the support rod is inserted into the coreless roll, then the roll can be mounted, but extended ribs make insertion difficult and can damage the innermost windings
Solution Approach 1:
The support rod structure is segmented with ribs only in outer sections, creating a clear central path for easy insertion into the coreless roll without the obstruction of continuous ribs.
Solution Approach 2:
The support rod is designed with the rib configuration predetermined during manufacturing, ensuring that the insertion-friendly structure is already in place before the rolling operation begins, eliminating the need for post-manufacturing adjustments.
3Ease of operation
If the support rod is made in several parts, then insertion is easier, but the structure becomes more complex
Solution Approach 1:
The support rod is divided into a minimal number of segments (main body with ribs in outer sections only) that are optimized for easy insertion while maintaining structural integrity, avoiding excessive complexity.
Data Source
Figure 1
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AI summary
A supporting rod for a material web that is wound to form a coreless roll (3) comprises two parts which interlock inside the roll (3) upon being axially inserted into the roll (3).