Double Walled Container Bottom Segmentation
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Solution Overview
Problem
Double walled containers with a flexible inner container that reduces capacity as contents are consumed face issues where the bottom section separates from the rigid outer container, leading to oxidation of remaining contents and deformation, resulting in inefficient use and waste, especially when containing liquids or cosmetics.
Innovation Solution
A manufacturing method involving a parison with a rigid outer layer and flexible inner layer, where the parison is molded with a standing skirt member around the bottom section to prevent separation, ensuring the flexible inner layer remains fixed to the rigid outer layer, even as contents are depleted, using a split mold with specific projections to maintain contact and prevent air ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible inner container capacity is reduced as contents are consumed, then oxidation of remaining contents is prevented, but the bottom section separates from the rigid outer container
Solution Approach 1:
The bottom section of the inner container is segmented into a first bottom part and a second bottom part, with the second bottom part extending downward beyond the first bottom part. This segmented structure allows the protruding second bottom part to maintain contact with the outer container's bottom surface, preventing separation while still allowing the main body of the inner container to shrink as contents are consumed.
Solution Approach 2:
The solution extends the bottom structure in the vertical dimension by having the second bottom part extend downward beyond the first bottom part. This vertical extension creates a contact point that maintains the connection between inner and outer containers without interfering with the horizontal shrinking of the container body as contents are consumed.
2Reliability
If the flexible inner container shrinks as contents are consumed, then oxidation is prevented, but the container deforms and loses self-standing capability
Solution Approach 1:
The bottom structure is segmented into a first bottom part that forms the main container bottom and a second bottom part that extends downward. This segmentation allows the first bottom part to shrink with the consumed contents while the second bottom part maintains the vertical structure and contact with the outer container, preventing deformation and maintaining self-standing capability.
Solution Approach 2:
The inner container uses a flexible material that allows the main body to shrink as contents are consumed, while the extended second bottom part provides structural support. The flexibility of the material enables the shrinking action while the extended bottom portion maintains the container's shape and standing capability.
3Reliability
If the flexible inner container is made to reduce capacity without deformation, then oxidation is prevented, but manufacturing complexity increases
Solution Approach 1:
The bottom structure is divided into two parts formed in different mold cavities. The first bottom part is formed in a first mold cavity while the second bottom part is formed in a second mold cavity. This segmentation allows each part to be formed separately with appropriate mold features, simplifying the overall manufacturing process while achieving the desired functional outcome.
Solution Approach 2:
The extended second bottom part is formed in advance during the molding process, protruding downward from the first bottom part. This preliminary formation of the extended bottom structure ensures that the contact capability is built-in during manufacturing, eliminating the need for additional assembly steps or complex post-processing operations.
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
This method prevents the bottom section of the flexible inner container from rising and separates from the rigid outer container, maintaining the container's self-standing capability and preventing external air from entering, thus preserving the contents and maintaining the container's shape and functionality.
Implementation Method 1
blowing gas into an inside of the molded parison, thereby forming a blown parison including a cylindrical section and a bottom section, the bottom section including a bottom projection
Data Source
AI summary
A manufacturing method of double walled container comprises preparing a parison having a rigid outer layer and a flexible inner layer, enclosing the parison within a mold including split mold halves, thereby forming a molded parison including a pre-blow cylindrical section, a pre-blow conical bottom section, a pre-blow bottom projection, and a lower parison excessive burr, blowing gas into an inside of the molded parison, thereby forming a blown parison including a cylindrical section and a bottom section, the bottom section including a bottom projection, and removing the lower parison excessive burr from the blown parison, wherein the flexible inner layer is fixed to the rigid outer layer in the bottom projection.