Sandwich Wrapping Bag With Pull-Open Header Design
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Solution Overview
Problem
Existing wrapping bags for sandwiches require manual separation of a sealing tape and raising of a bottom portion for opening, which can cause pressure on the sandwich, potentially pushing out ingredients or damaging the contents.
Innovation Solution
A wrapping bag design featuring two films sealed along opposite lateral edges, a header part with a cutting line, an unsealing device, and a housing part that allows easy opening by pulling a tab, enabling the sandwich to be grasped without applying pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing and opening tape is used to seal the opening of the bag body, then the sandwich can be securely wrapped, but the opening process becomes complex requiring separation of the tape and raising of the bottom portion
Solution Approach 1:
The bag is divided into a sealed portion (with the sealing tape) and an unsealed portion (bottom portion), allowing the unsealed portion to be pulled apart first for easy opening while the sealed portion maintains wrapping security. The bottom portion is separated from the main body and can be easily torn open without affecting the sealed contents.
Solution Approach 2:
The bottom portion is extracted as a separate element that can be independently manipulated for opening purposes. This extracted portion serves as an access point that doesn't compromise the main sealed structure, enabling easy opening while maintaining wrapping integrity.
2Ease of operation
If the bag is grasped through the lateral side portions for display or purchase, then the bag can be handled, but pressure is applied to the sandwich causing ingredient displacement or damage
Solution Approach 1:
The header portion acts as an intermediary structure between the user's hand and the sandwich. Users grasp the header (which extends beyond the sandwich) rather than the sandwich directly, preventing pressure transmission to the food contents while still enabling easy handling for display and purchase.
3Ease of operation
If the bottom portion is raised to expand the opening for taking out the sandwich, then the sandwich can be accessed, but the process requires multiple steps reducing convenience
Solution Approach 1:
The opening mechanism is segmented into a simple tear-apart action of the bottom portion rather than requiring raising and repositioning. The bottom portion is designed to be easily torn open in one motion, reducing the number of steps needed to access the sandwich while maintaining accessibility.
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 openability and hand-graspability, preventing pressure-induced ingredient displacement and damage, while maintaining the integrity of the sandwich during display and consumption.
Implementation Method 1
two films that are overlapped to each other and sealed together along their opposite lateral edges
Implementation Method 2
an unsealing device that is provided in the one film to extend from a vicinity of the cutting line to a vicinity of the opening while crossing the seal part
Data Source
AI summary
A wrapping bag for food such as a sandwich includes a seal part formed by sealing two films between the opposite lateral edges in a vicinity of one longitudinal edges of the two films; a header part formed between the one longitudinal edges of the two films and the seal part; a cutting line, from which opening of the wrapping bag is started, being formed in the header part of one of the two films; an opening formed in the opposite longitudinal edges of the two films that are not sealed together; and an unsealing device that is provided in the one film to extend from a vicinity of the cutting line to a vicinity of the opening while crossing the seal part.