Container Bottom Web Detachment Mechanism
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Solution Overview
Problem
Existing methods for producing containers with a rigid outer and deformable inner thermoplastic layers fail to ensure even detachment and reattachment of the inner bag from the outer container, leading to potential leakage and incomplete dispensing of contents due to uneven detachment and high negative pressure.
Innovation Solution
A method involving the removal of a small section of the bottom web of the outer container using a hollow knife to expose the inner bag's bottom seam, followed by lifting and pressurizing the seam with compressed air to detach the inner bag evenly and reattach it without damage or deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner bag is detached from the outer container by applying negative pressure, then the inner bag can be separated from the outer container, but the detachment is uncontrollable and uneven, leading to high negative pressure and potential leakage
Solution Approach 1:
A detachment opening is pre-formed in the outer container wall through the bottom web area before the inner bag needs to be detached. This preliminary action allows controlled introduction of pressure medium to evenly separate the inner bag from the outer container wall, preventing uncontrollable detachment and high negative pressure that cause leakage
Solution Approach 2:
A pressure medium (compressed air or vacuum) is introduced through the detachment opening to act as an intermediary force that evenly separates the inner bag from the outer container wall. This controlled intermediary action replaces the uncontrollable negative pressure application, ensuring uniform detachment without creating harmful pressure differentials
2Reliability
If pressure equalization openings are formed in the outer container wall, then pressure equalization should occur, but uneven detachment still occurs leading to high negative pressure and impaired pump functionality
Solution Approach 1:
The detachment opening is pre-formed in the outer container wall through the bottom web area before use. This ensures that when the inner bag needs to be detached, pressure equalization can occur uniformly and controllably, preventing uneven detachment that would otherwise impair pump functionality and prevent complete contents dispensing
3Ease of operation
If the bottom web of the outer container is modified to form a detachment opening, then even detachment of the inner bag is achieved, but the structure of the bottom web is altered
Solution Approach 1:
The detachment opening is formed locally in the bottom web area of the outer container wall, affecting only a small localized region. This local modification enables even detachment of the inner bag while minimizing alterations to the overall bottom web structure, maintaining structural integrity where not modified
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
Enables complete, even separation and repositioning of the inner bag from the outer container without damage, minimizing oxygen diffusion and ensuring complete contents dispensing without leakage or permanent deformation.
Implementation Method 1
A pressure medium, generally compressed air, is then introduced into the inner bag through the container opening to reattach it to the outer container
Implementation Method 2
This can be achieved by applying negative pressure to the inner bag through the container opening, causing it to suddenly contract
Implementation Method 3
The preform is then inflated by a pressure medium, generally compressed air, until it rests against the wall of the blow mold
Data Source
Figure 1~3
AI summary
The method for manufacturing a container, comprising a substantially rigid outer container and a readily deformable inner bag made of thermoplastic materials that are not welded together, with a container opening and at least one wall opening in the outer container through which pressure equalization occurs in the space between the inner bag and the outer container, wherein a preform consisting of at least two tubes is co-extruded and arranged between the open halves of a blow mold, and the blow mold is closed when the preform has reached the length required for manufacturing the container, wherein excess material in the bottom region of the container to be manufactured is squeezed off and a crimp seam is formed, which has a bottom web made of welded material of the outer container in which the welded bottom seam of the inner bag is clamped and held in the axial direction.The process, in which the preform is inflated by a pressure medium to conform to the wall of the blow mold and removed from the blow mold, is characterized by the following steps: a) removal of a section of the bottom rib of the outer container, so that a section of the bottom seam of the inner bag is exposed to the outside; b) lifting the exposed section of the bottom seam into the outer container, so that an opening is created between the bottom seam of the inner bag and the outer container; c) introduction of a pressure medium into the opening, causing the inner bag to detach from the outer container on both sides; d) supplying a pressure medium into the container opening, so that the inner bag again conforms to the outer container.