Microwavable Pouch Steam Venting and Rupture Prevention
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Solution Overview
Problem
Microwavable pouches with automatic steam venting mechanisms can unintentionally rupture at slitting portions during heating due to increased internal pressure, causing food to scatter and compromising openability.
Innovation Solution
A microwavable pouch formed by thermally bonding laminated films with an automatic steam venting mechanism, featuring a steam venting seal portion and a steam release portion, where at least part of the intermediate layer includes a slitting portion, and the polybutylene terephthalate layer is configured to remain intact and elongatable, preventing unintentional rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slitting portion is provided in the laminated film to enable easy opening, then openability is improved, but the pouch may rupture unintentionally during heating
Solution Approach 1:
The slitting portion is segmented into two distinct functional zones: a first slitting portion that enables easy opening by separating the front and back laminated films, and a second slitting portion that acts as a stress relief feature without compromising structural integrity. This segmentation allows the pouch to be opened easily while preventing unintentional rupture during heating.
Solution Approach 2:
Different regions of the slitting portion are given different characteristics: the first slitting portion has full separation for easy opening, while the second slitting portion maintains partial film continuity to provide stress distribution. This local differentiation enables both easy opening and rupture resistance simultaneously.
2Object-generated harmful factors
If an automatic steam venting mechanism is provided to release steam during heating, then steam venting is improved, but the pouch may still rupture due to internal pressure increase
Solution Approach 1:
The steam venting function is extracted and concentrated into a dedicated steam venting hole formed through the seal portion, separating this function from the slitting portion. This allows efficient steam release while the slitting portion maintains its opening function without interfering with pouch integrity during heating.
Solution Approach 2:
The steam venting hole is pre-formed in the seal portion before heating, providing a predetermined path for steam escape. This preliminary action ensures that when internal pressure builds up during heating, steam can escape through the pre-positioned venting hole rather than causing uncontrolled rupture.
3Reliability
If the polybutylene terephthalate layer is made intact and elongatable, then rupture resistance is improved, but the slitting portion may still fail under high internal pressure
Solution Approach 1:
The second slitting portion is designed to dynamically respond to internal pressure changes during heating. When pressure increases, the elongatable polybutylene terephthalate layer in the second slitting portion can deform and redistribute stress, preventing failure while maintaining the integrity of the pouch structure.
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 ensures reliable steam venting and maintains the pouch's integrity during heating, preventing rupture at the slitting portion while maintaining excellent openability.
Implementation Method 1
the polybutylene terephthalate exhibits the characteristics of being elongatable and difficult to break at high temperatures
Implementation Method 2
the polybutylene terephthalate exhibits the characteristics of being elongatable
Implementation Method 3
the steam venting seal portion configured to initiate separation when an internal pressure of the containing portion increases during heating
Implementation Method 4
formed into a bag shape by thermally bonding laminated films that overlap each other
Data Source
AI summary
The present invention addresses an object for providing a microwavable pouch in which a slitting portion does not unintentionally rupture during heating while obtaining excellent openability. A microwavable pouch according to the present invention is formed into a bag shape by thermally bonding laminated films and includes an automatic steam venting mechanism. The laminated film has a configuration of polybutylene terephthalate layer/vapor-deposited polyethylene terephthalate layer/cast polypropylene layer, or a configuration of vapor-deposited polyethylene terephthalate layer/polybutylene terephthalate layer/cast polypropylene layer, and at least part of the intermediate layer of the laminated film has a slitting portion.