Pouch Top Surface Sheet Bending Suppression
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Solution Overview
Problem
Pouches with top surface sheets tend to bend when discharging contents, making it difficult to empty the contents efficiently due to the rigidity of the top surface sheet.
Innovation Solution
A pouch design featuring a packaging bag with a top surface sheet, side seal portions, and top enclosing portions, where the side seal portions include a column and projection to stabilize discharge and prevent bending, and the top enclosing portions are elongated to secure volume without excessive rigidity, allowing easy gripping and discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a top surface sheet is provided to secure greater volume for housing portion, then volume is improved, but the top surface sheet bends when contents are discharged making discharge difficult
Solution Approach 1:
The patent applies local quality by creating a top enclosing portion with different rigidity characteristics from the rest of the top surface sheet. The top enclosing portion is formed by sealing the top surface sheet to the front and back surface sheets at both ends, creating a localized rigid structure. This localized rigidity suppression allows the spout to be easily gripped and operated, while the rest of the top surface sheet maintains sufficient volume for the housing portion.
2Stability of the object's composition
If top enclosing portion is formed to suppress bending, then rigidity is improved, but excessive rigidity near spout makes gripping difficult
Solution Approach 1:
The top enclosing portion is designed with specific dimensional constraints to achieve local quality. The distance between the top enclosing portion and the spout in the width direction is controlled to be 10 mm or more, ensuring that the rigid top enclosing portion does not interfere with spout gripping operations while still providing sufficient stability to suppress bending of the top surface sheet during discharge and transportation.
3Strength
If side seal portions are formed by sealing front and back surface sheets, then structural integrity is improved, but volume for housing portion may be reduced
Solution Approach 1:
The patent employs flexible sheets (front surface sheet, back surface sheet, and top surface sheet) to form the packaging bag structure. These flexible thin films are sealed at their end portions to create side seal portions, forming a structural framework that provides structural integrity while maintaining flexibility. This approach allows the packaging bag to maintain its shape and strength while preserving sufficient volume for the housing portion, as the flexible sheets can conform to the required geometry without excessive material consumption.
Data Source
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AI summary
A pouch (1) includes a packaging bag (100) including a front surface sheet (101), a back surface sheet (102), a bottom surface sheet (103), and a top surface sheet (104) and a spout (200). The packaging bag (100) includes a pair of side seal portions (110, 120), a front bottom seal portion (130), a back bottom seal portion (140), a front top seal portion (150), and a back top seal portion (160). At least one of the pair of side seal portions (110, 120) includes a side enclosing portion (112) in which a gas is enclosed, the side enclosing portion (112) having an elongated shape in a height direction. At least one of the front top seal portion (150) or the back top seal portion (160) includes a top enclosing portion (152, 162) in which a gas is enclosed, the top enclosing portion (152, 162) having an elongated shape in a width direction.