Wraparound Case Slit and Tear Sections
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Solution Overview
Problem
Conventional wraparound cases with perforations across the entire ridgeline of the top face lid exhibit visible tear marks when re-sealed, affecting the appearance.
Innovation Solution
A wraparound case design featuring a slit along the ridgeline between the top face panel and side face panels, with tear sections that are strategically located and torn when opening, minimizing the visibility of perforation marks upon re-sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If perforation is provided across the entire ridgeline of the top face lid, then the top face lid can be easily re-closed after opening, but perforated tear marks become apparent and negatively affect the appearance
Solution Approach 1:
The continuous perforation across the entire ridgeline is divided into multiple separate tear sections positioned at specific locations (front face panel side, back face panel side, and side face panels). This segmentation allows the tear marks to be concentrated in less visible areas while maintaining the ease of opening and re-closing functionality.
Solution Approach 2:
Different regions of the ridgeline are treated differently by positioning tear sections strategically. The tear sections are located at the front face panel side, back face panel side, and side face panels where tear marks are less noticeable, while the central portion of the ridgeline maintains its structural integrity for better appearance.
2Shape
If tear sections are strategically positioned rather than continuous perforation, then perforation marks are less apparent when re-sealed, but the structure becomes more complex
Solution Approach 1:
The perforation structure is segmented into discrete tear sections positioned at the front face panel side, back face panel side, and side face panels. This segmentation reduces the overall amount of perforation needed while achieving the same functional effect of easy opening and acceptable appearance when re-sealed.
Solution Approach 2:
The harmful continuous perforation across the entire ridgeline is extracted and replaced with minimal tear sections only where necessary for functionality and where tear marks are least visible. This removes the appearance problem while preserving the essential opening function.
Data Source
AI summary
A wraparound case comprises: a case main body including a top face panel and a bottom face panel that face each other, a front face panel and a back face panel that face each other, a pair of side face panels that face each other, and an insertion flap that extends out from the top face panel and overlaps with the front face panel; a hinge section that is formed between the top face panel and the back face panel; a slit that is formed along a ridgeline between the top face panel and each of the pair of side face panels; and tear sections that couple a front face panel side and a back face panel side of the top face panel with the pair of side face panels, and that are torn when the top face panel is opened.