Packaging Bag Steam Venting via Peelable Tape
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Solution Overview
Problem
Packaging bags designed for microwave cooking often rupture due to internal pressure buildup, leading to contamination of the oven and loss of contents, as existing steam venting solutions either compromise cooking efficiency or fail to prevent staining.
Innovation Solution
A packaging bag with a fold-in part and an easily peelable tape that delaminates to create a steam venting port, allowing pressure release without bursting, while maintaining cooking efficiency and preventing oven staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a small air hole or cut is made in the packaging bag before microwave cooking, then internal pressure buildup is prevented, but steam cooking effect is reduced and food dehydration accelerates
Solution Approach 1:
The packaging bag is pre-formed with a sealed steam venting port structure during manufacturing, but the port remains closed during storage and transport. The sealing structure is designed to automatically open only when exposed to microwave heating, allowing preliminary preparation without compromising the steam cooking function.
Solution Approach 2:
The steam venting port utilizes temperature-dependent material properties to transition from a sealed state at room temperature to an open state during microwave heating. The sealing material's adhesive strength decreases with temperature, allowing automatic opening when the bag is heated, thus maintaining pressure during storage and enabling steam venting during cooking.
2Reliability
If the packaging bag is sealed completely without steam venting, then food quality is maintained through steam cooking, but the bag may rupture and scatter contents due to internal pressure
Solution Approach 1:
The steam venting port is pre-configured with a sealing structure during bag manufacturing, creating a closed system that maintains steam pressure for effective cooking. The seal is designed to remain intact during storage and transport, preventing premature opening while preserving the capability for controlled venting during heating.
Solution Approach 2:
A sealing structure acts as an intermediary between the bag interior and exterior, controlling the transition of the steam venting port from closed to open state. This intermediary mechanism allows the bag to maintain complete sealing during non-heating phases while enabling safe pressure release during microwave cooking, preventing rupture and contamination.
3Stress or pressure
If an easily peelable region is provided in the heat-sealing part to release steam, then internal pressure is relieved, but contents scatter and stain the microwave oven
Solution Approach 1:
The steam venting function is extracted from the general heat-sealing structure by providing a dedicated, localized port with specific opening characteristics. This separate venting structure is positioned and designed to control steam release direction, separating the pressure relief function from the main sealing system and preventing content scattering.
Solution Approach 2:
The steam venting port is designed with localized opening characteristics that differ from the rest of the sealed bag structure. The port's geometry, positioning, and opening mechanism are specifically tailored to release steam in a controlled direction away from the bag contents, while the remainder of the bag maintains its sealed integrity to prevent scattering.
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 solution effectively manages internal pressure, preventing bag rupture and oven contamination, while ensuring efficient steam release and maintaining food quality.
Implementation Method 1
an easily peelable side of the easily peelable tape is heat-sealed in making positioning to the inner sheet part side of the fold-in part; and the easily peelable seal part made as a capable of a delamination by thermal welding of the easily peelable side of the easily peelable tape in the above mentioned seal part and a sealant layer of the above mentioned inner sheet part
Implementation Method 2
a steam venting port is opened by a force of an emitted steam when heated by means of a heating means such as a microwave oven
Data Source
AI summary
A packaging bag having a steam venting function capable of releasing pressure inside a package even when heating cooking is performed by a microwave oven and preventing the inside of the bag from being contaminated and the package using the packaging bag. The packaging bag includes two pieces of front and back main body films having sealant layers which are opposed to each other with the sealant layers facing inward, side seal parts, and a bottom seal part. The front body film is folded in the vicinity of the bottom seal part throughout the entire width of the bag and parallel with the bottom seal part to form a fold-in part. A steam venting port is formed in the fold-in part, and an easily peelable tape covering the steam venting port is disposed on the inside of the fold-in part throughout the width of the bag and parallel with the fold-in part, and then heat-sealed.