Steam-Releasing Pouch Sealing Layer Separation
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Solution Overview
Problem
Conventional steam-releasing pouches often fail to open appropriately when internal pressure increases, leading to inadequate steam discharge due to the direction of separation in the steam-releasing sealing portion being orthogonal to the machine direction of the resin, which hinders the separation process.
Innovation Solution
The steam-releasing pouch features laminated sheets with a steam-releasing sealing portion composed of first and second base layers with different inner structures and block copolymer compositions, designed to separate cleanly when pressure increases, ensuring effective steam discharge by aligning the separation direction with the machine direction of the resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steam-releasing sealing portion is designed with conventional single-layer structure, then the manufacturing process is simple, but the separation does not occur appropriately when pressure increases, hindering steam discharge
Solution Approach 1:
The sealing portion is divided into multiple functional layers: a first sealant layer with a first base layer having low affinity for the second base layer, and a second sealant layer with a second base layer having high affinity for the third base layer. This segmentation allows different separation behaviors in different regions, enabling appropriate steam release while maintaining structural integrity.
Solution Approach 2:
The patent uses composite material structure with different base layers (first base layer, second base layer, third base layer) having different properties. The first base layer is designed to separate easily from the second base layer when pressure increases, while the second and third base layers remain strongly bonded. This composite structure resolves the contradiction by providing both reliability in separation and controlled complexity.
2Reliability
If the separation direction in the steam-releasing sealing portion is orthogonal to the machine direction of resin, then the sealing structure is simple, but the machine direction of resin acts against the pressure, hinders separation, and forms incomplete passages
Solution Approach 1:
The patent applies local quality by making the first base layer have low affinity specifically with the second base layer, while the second and third base layers have high affinity. This localized difference in adhesion properties ensures that separation occurs only where needed (between first and second base layers) while maintaining strength where required (between second and third base layers), achieving complete separation without complex structural modifications.
3Productivity
If the steam-releasing sealing portion uses uniform base layers, then the manufacturing process is simple, but the separation creates residual films and strings, reducing steam discharge efficiency
Solution Approach 1:
The patent changes the affinity parameter between base layers by selecting materials with different surface properties. The first base layer is designed to have low affinity for the second base layer, enabling clean separation without residual films or strings. This parameter change in material affinity achieves high steam discharge efficiency while maintaining a relatively simple multi-layer structure.
Data Source
AI summary
A steam-releasing pouch includes two laminated sheets forming an accommodation compartment that accommodates a content, a sealing portion that seals the two sheets to form an opening that opens part of the accommodation compartment, and a steam-releasing sealing portion formed in the sealing portion to open as pressure of the accommodation compartment increases in a state in which the opening is sealed. The steam-releasing sealing portion includes a first sealant layer having at least a first base layer that faces the accommodation compartment and a second base layer laminated with the first base layer and a second sealant layer having at least a third base layer that faces the accommodation compartment and a fourth base layer laminated with the third base layer. The first base layer and the third base layer are joined together.