Coreless Roll Paper Packaging with Interlocking Holding Members
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Solution Overview
Problem
Coreless roll paper lacks the structural strength at its axis portion, making it difficult to be securely held in packaging structures, as existing solutions that rely on bearing members inserted into the winding core are insufficient due to the hollow structure.
Innovation Solution
A package structure featuring an outer case with lower and upper holding members, each with concave portions matching the roll paper's diameter, securely holding the roll paper by fitting within the case and providing additional support through a buffer sheet to absorb shocks and impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearing members are inserted into the winding core to support the roll paper, then the roll paper can be securely held, but the structure becomes complex and costly
Solution Approach 1:
The invention extracts the winding core from the roll paper structure, creating a coreless roll paper design. This eliminates the need for bearing members that were previously inserted into the winding core, thereby simplifying the packaging structure while maintaining support functionality through the hollow cylindrical shape alone
Solution Approach 2:
The packaging structure is segmented into distinct functional components: the outer case provides containment, the holding members provide support, and the buffer sheet provides protection. This segmentation allows each component to be optimized independently, reducing overall complexity while improving reliability
2Ease of manufacture
If coreless roll paper is used to reduce cost, then manufacturing cost decreases, but the axis portion strength is insufficient
Solution Approach 1:
The invention introduces holding members as intermediary components between the coreless roll paper and the outer case. These holding members compensate for the insufficient axis portion strength by providing additional structural support, allowing the use of cost-effective coreless roll paper without compromising durability
Solution Approach 2:
The packaging structure combines different materials with complementary properties: the coreless roll paper provides the paper product, the holding members provide structural strength, and the buffer sheet provides impact absorption. This composite approach allows cost reduction through coreless design while maintaining overall strength through material combination
3Ease of operation
If the concave portion inside diameter is made larger to accommodate roll paper, then ease of insertion is improved, but the holding capability decreases
Solution Approach 1:
The concave portions are strategically positioned at specific locations on the holding members where they provide maximum holding capability. The local geometry of these concave portions is optimized to match the roll paper diameter, providing secure retention while maintaining ease of insertion through proper positioning and dimensional design
Data Source
AI summary
The present invention provides a structure for storing coreless roll paper R having a hollow portion in the axis portion instead of a winding core, wherein the structure includes an outer case 2 for storing roll paper R; and a lower holding member and an upper holding member 4 respectively having concave portions 31,41 each having an inside diameter that closely matches the outside diameter of the roll paper R, each of the lower holding member 3 and the upper holding member 4 having an external shape that fits the outer case 2, wherein the lower holding member 3 is disposed in the outer case 2 with the concave portion 31 facing upward, and the upper holding member 4 is disposed in the outer case 2 at the location above the lower holding member 3 with its concave portion 41 facing downward.