Spouted Pouch Shape-Control Seals for Bulge Stability
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Solution Overview
Problem
Conventional spouted pouches experience bulging and buckle-triggering points due to the weight of the liquid content, leading to compromised self-standing ability, especially in larger sizes.
Innovation Solution
The spouted pouch incorporates first and second shape-controlling seal portions formed by heat sealing the films together at specific locations, which adjust the inclination of the spout fixture target portion, minimizing buckle-triggering points and enhancing self-standing ability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the pouch body is made with flexible resin films to contain liquid content, then the pouch can be formed in large sizes (e.g., 6L), but bulging occurs in lower parts where films expand outward by the weight of the liquid content
Solution Approach 1:
The side seal is divided into multiple sections along the vertical direction, with each section having a different inclination angle. This segmentation allows the pouch to accommodate the bulging caused by liquid weight while maintaining overall structural stability and preventing buckle formation.
Solution Approach 2:
Different portions of the side seal are given different inclination angles to address local stress distribution. The lower portion has a smaller inclination angle to accommodate bulging, while the upper portion has a larger inclination angle to maintain stability, creating local quality variations that solve the global shape stability problem.
2Ease of manufacture
If the pouch body is made with flexible resin films, then the pouch can be easily manufactured, but buckle-triggering points form near lower parts of side seals due to film denting
Solution Approach 1:
The side seal inclination angles are designed to vary dynamically along the vertical direction, with the lower portion having a smaller angle and the upper portion having a larger angle. This dynamic design allows the seal to adapt to the bulging pressure from liquid weight while preventing buckle formation, thereby maintaining self-standing ability without compromising manufacturing ease.
3Ease of manufacture
If the spout fixture portion is positioned normally, then the spout can be easily attached to the pouch body, but the pouch body tends to easily buckle at buckle-triggering points, compromising self-standing ability
Solution Approach 1:
The side seal structure is designed with asymmetric inclination angles, where the lower portion has a smaller angle and the upper portion has a larger angle. This asymmetric design creates a stable structural configuration that prevents buckling at the spout fixture portion while maintaining easy spout attachment, thereby resolving the contradiction between manufacturing ease and structural stability.
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 adjustment of the spout fixture target portion's inclination through the shape-controlling seal portions effectively reduces the formation of buckle-triggering points, thereby improving the self-standing ability of the spouted pouch.
Implementation Method 1
a first shape-controlling seal portion formed by heat sealing the first film and the side film together
Data Source
AI summary
To provide a spouted pouch with a simple structure and improved self-standing ability of the pouch body. The spouted pouch 10 is configured to dispense a liquid content from a spout 60 attached to a side face of a pouch body 20 in a state placed with a pouch bottom 20a down. The pouch body 20 further includes a first shape-controlling seal portion 24 formed by heat sealing a first film 30 and a side film 40 together at a location on an inner side of a first side seal 23a in the left-right direction. The first shape-controlling seal portion 24 has an area located in a region between an upper half of a spout fixture portion 32 and the first side seals 23a, and does not have an area located below the center in the up-down direction of the spout fixture portion 32.