Reel Hub Dimensional Accuracy via Insert Molded Reinforcement
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Solution Overview
Problem
Conventional recording tape reels with metal reinforcing rings disposed by insert molding face challenges in maintaining dimensional accuracy due to differential contraction of the hub and flange portions during resin cooling, leading to deformation and uneven tape winding.
Innovation Solution
A resin layer is integrated with the reel hub, extending along the inner surface of the reinforcing tubular member to control contraction, ensuring uniform diameter and improved rigidity by embedding the reinforcing ring within the hub, thereby stabilizing the hub shape and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal reinforcing ring is disposed on the hub by insert molding, then the hub deformation is controlled, but the dimensional accuracy of the hub is deteriorated due to differential contraction between hub and flange portions
Solution Approach 1:
The hub is divided into a hub body portion and a flange portion, with the reinforcing ring selectively disposed only in the hub body portion. This segmentation allows the hub body to maintain its rigidity enhancement while the flange portion contracts freely during molding, thereby achieving both improved strength and dimensional accuracy.
Solution Approach 2:
The reinforcing ring is locally disposed only in the hub body portion where strength is needed, rather than throughout the entire hub. This local reinforcement provides the necessary rigidity to control deformation during tape winding while allowing the flange portion to contract uniformly, maintaining overall dimensional accuracy.
2Strength
If the reinforcing ring is disposed by insert molding, then the hub strength is improved, but the contraction uniformity is deteriorated leading to hub shape distortion
Solution Approach 1:
By segmenting the hub into a hub body portion and a flange portion, and placing the reinforcing ring only in the hub body, the invention allows different parts to contract independently according to their functional requirements. The hub body maintains shape stability through reinforcement while the flange contracts uniformly without distortion.
Solution Approach 2:
The reinforcing ring acts as an intermediary element that provides structural support to the hub body portion during the molding process. It mediates between the need for strength and the need for uniform contraction, allowing the hub body to maintain its shape while the flange portion contracts freely.
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 enhances the dimensional accuracy and uniformity of the reel hub, stabilizing tape winding and preventing partial stretching, thus improving the mechanical integrity and performance of the recording tape reel.
Implementation Method 1
by contraction of the resin material when molding (cooling), the contraction of the hub portion which is controlled by the reinforcing ring and that of the flange portion which is not controlled may be different
Data Source
AI summary
The invention of the present application provides a reel, which can improve the dimensional accuracy of a hub, having a configuration in which a reinforcing tubular member is disposed on the hub by insert molding. A resin layer extends from one end portion side of the hub at which a first flange is integrally formed in a height direction of the hub. The resin layer is disposed on an inner peripheral surface of the tubular member in the reel. The reel is provided with a resin hub having an outer peripheral surface on which a recording tape T is wound, the first flange is integrally formed at one end portion of the hub, a second flange is welded at the other end portion of the hub, and a reinforcing tubular member is disposed on an inner peripheral surface of the hub by insert molding.