Deformable-Bag Container With Non-Linear Pressure-Balancing Seam
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing containers with a stiff outer container and deformable inner bag require complex manufacturing steps to form wall openings for pressure balancing, increasing time and cost.
Innovation Solution
A non-linear pinch seam, such as a toothed, wave-shaped, or step-shaped seam, is used on the container base, allowing ambient air to flow through capillary openings for pressure balancing without the need for additional wall openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wall openings are formed in the outer container to enable pressure balancing, then the inner bag can contract and expand properly, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The invention extracts the pressure balancing function from the wall openings and relocates it to the base region of the container. The pinch seam in the base is designed to allow air passage while maintaining container integrity, eliminating the need for complex wall opening formation processes.
Solution Approach 2:
The invention moves the pressure balancing mechanism from the vertical wall dimension to the horizontal base dimension. By designing the pinch seam in the base region with specific geometries (toothed, wavy, or stepped patterns), air can flow horizontally through the base instead of requiring vertical wall openings.
2Reliability
If wall openings are formed in the outer container, then pressure balancing is achieved, but manufacturing time and costs increase
Solution Approach 1:
The pressure balancing capability is built into the container structure during the initial forming process. The pinch seam is created as an integral part of the base region during container manufacturing, so no additional steps are needed later to create wall openings for pressure balancing.
3Adaptability or versatility
If the inner bag is released from the outer container wall, then the inner bag can be refilled, but ambient air must flow into the gap requiring pressure balancing
Solution Approach 1:
The pinch seam structure automatically provides pressure balancing functionality without requiring external control mechanisms. As the inner bag contracts or expands, air naturally flows through the pinch seam openings in the base region, maintaining pressure equilibrium automatically.
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 non-linear pinch seam effectively balances pressure during use by forming minute air slit openings, eliminating the need for complex manufacturing steps and reducing costs.
Implementation Method 1
Due to the non-linear shape of the pinch seam, it has a considerably greater length... minute air slit openings form in the seam of the outer container. Ambient air flows through these capillary openings into the gap between the contracting inner bag and the outer container
Data Source
AI summary
A container including a stiff outer container and a deformable inner bag where the inner bag has a preform consisting of at least two tubes coextruded and arranged between the open halves of a blow mold, where the blow mold is closed when the preform has the length necessary for the production of the container, and excess material from the base region of the container to be produced is squeezed out and a pinch seam is formed from fused material of the outer container. The pinch seam at the base of the container has a non-linear shape and is longer than with a linear shape and that due to the opening of the blow mold, minute air slit openings are formed in the seam of the outer container, through which ambient air enters into the gap between the inner bag and the outer container for pressure balancing purposes.