Sack Cover Sheet With Integrated Handle And Tear Line
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Solution Overview
Problem
Existing sack designs with handles often compromise carrying capacity or suffer from handle detachment issues, and opening the sacks can be difficult due to their high strength and complex construction.
Innovation Solution
A tubular sack design with a cover sheet that integrates handle functionality through strategically placed cuts or perforations, allowing for easy grip and force distribution while maintaining structural integrity, and incorporating tear lines for non-destructive opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If handles are added to sacks for easier carrying, then ease of operation is improved, but the carrying capacity and structural integrity may be compromised
Solution Approach 1:
The handle is divided into multiple sections (first handle section, second handle section, third handle section) that are integrated into different portions of the sack body. Each section is formed from the sack material itself through folding and connecting, distributing the load across multiple structural elements rather than concentrating stress at a single attachment point.
Solution Approach 2:
The handle structure is merged with the sack body by forming the handle sections from the same material and integrating them into the sack structure. The first handle section is formed from the front wall, the second from the rear wall, and the third connects them, creating a unified structure where the handle and sack body work together as a single load-bearing system.
2Strength
If the sack is made from high-strength material to maintain structural integrity, then strength is improved, but the sack becomes difficult to open
Solution Approach 1:
A tear line is extracted or introduced into the sack body at a specific location, creating a predetermined weakness in the otherwise high-strength material. This tear line allows the sack to be easily opened by applying force at that specific point, while the rest of the sack structure maintains its full strength for carrying and protecting contents.
3Volume of moving object
If the sack body is folded into a compact bottom to save space, then volume efficiency is improved, but the structural complexity increases
Solution Approach 1:
The sack body portions are folded and nested together to form a compact bottom structure. The end flaps are folded over and connected to each other, with the first handle section nested within the front wall structure and the second handle section nested within the rear wall structure, creating a space-efficient configuration where multiple functional elements are integrated into a compact form.
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 design enhances carrying capacity and ease of use by distributing force through multiple layers, preventing handle detachment and allowing for easy opening and access to the sack's contents without damaging the material.
Implementation Method 1
The intermediate sections (10d, 10e) are folded inwardly at the inner fold edges (10b, 10c) and the outer sections (10h, 10j) are folded outwardly at the intermediate fold edges (10f, 10g). At least the outer sections (10h, 10j) and in embodiments of the invention also the central section (10a) are connected to the folded bottom (1d).
Data Source
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AI summary
A bag (1) having a tubular bag body (1a) is folded, at an end region, to form a bottom (1d), which is connected to a cover sheet (10). The cover sheet (10) comprises a central portion (10a), two intermediate portions (10d, 10e), which extend laterally from the central portion (10a), and two outer portions (10h, 10j), which extend laterally from the intermediate portions (10d, 10e). The intermediate portions (10d, 10e) are folded over inwards along inner folding edges (10b, 10c). The outer portions (10h, 10j) are folded over outwards along intermediate folding edges (10f, 10g). The outer portions (10h, 10j) and the central portion (10a) are connected to the bottom (1d). Grip holes (12, 13; 12a, 13a; 14, 15) defined by incisions, perforations or material weakening are formed in the central portion (10a) or in the outer portions (10h, 10j) and in the intermediate portions (10d, 10e). With the cover sheet (10) folded, the grip holes (12, 13; 12a, 13a) in the central portion (10a) or in the outer portions (10h, 10j) are arranged flush in relation to adjacent grip holes (14, 15) of the intermediate portions (10d, 10e).