Pocket Sheet Protector Corner Notch Design
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Solution Overview
Problem
Existing pocket sheet protectors tend to generate load and cause wrinkles or bending when accommodating thick documents, as they lack effective corner reinforcement and expansion mechanisms.
Innovation Solution
A pocket sheet protector design featuring overlapping rectangular sheets with strategically placed welding lines, notched portions at corners, and hinge lines to facilitate expansion and prevent deformation, allowing for the accommodation of thick documents without wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If non-welded portions are disposed on both sides of a bottom welding line to accommodate thick documents, then the accommodating capacity is improved, but load concentration and wrinkle formation occur at corner regions
Solution Approach 1:
The bottom welding line is segmented by introducing notched portions that divide it into multiple sections. This segmentation allows the welding line to flex and expand when accommodating thick documents while maintaining structural integrity at critical corner regions, resolving the contradiction between accommodating capacity and corner strength.
Solution Approach 2:
The notched portions are strategically positioned at corner regions where strength is most needed, creating local variations in the welding line structure. These notched portions provide localized flexibility for expansion while preserving overall structural strength, addressing both accommodating capacity and corner strength requirements.
2Ease of manufacture
If the pocket sheet protector structure is simplified, then manufacturing ease is improved, but the ability to prevent wrinkles and bending is reduced
Solution Approach 1:
The notched portions are pre-formed in the welding line structure before the document is inserted. This preliminary structural preparation enables the pocket sheet protector to naturally expand and accommodate thick documents without creating wrinkles or bending, achieving reliable protection through a simple manufacturing process.
Data Source
AI summary
A pocket sheet protector and a booklet thereof include a main body portion that is formed in a pocket shape. The main body portion includes a first welding line that divides the main body portion into an accommodating section and a binding margin in the vicinity of one side thereof, and a second welding line that seals the bottom side of the main body portion. Further, the main body portion includes, at a bottom side corner, a notched portion which extends closer to the accommodating section than the first welding line, and cuts out a lower end of the first welding line and an end of the second welding line.