Multilayer Bottle Reducing Dead Space via Inner Diameter Segmentation
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Solution Overview
Problem
In multilayer containers, when the volume reduction deformation of the inner container body reaches a limit, creating a 'dead space' larger than the space occupied by gas after content charging, it becomes difficult to thoroughly expel the content, as the outer opening section specifications limit further reduction in dead space.
Innovation Solution
A synthetic resin-made multilayer bottle design featuring a cylindrical outer shell bottle with a small-diameter section on the inner opening section's inner surface, reducing the inner opening section's volume without altering the outer diameter, and incorporating an air passage and contact sections to minimize dead space while maintaining specification compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the inner opening section volume is reduced to minimize dead space, then content expulsion completeness is improved, but the outer opening section specifications cannot be altered due to cap compatibility requirements
Solution Approach 1:
The inner opening section is divided into two distinct parts: an upper portion with a larger diameter that maintains compatibility with the outer opening section specifications, and a lower portion with a smaller diameter that reduces dead space volume. This segmentation allows each part to fulfill its specific function independently.
Solution Approach 2:
Different diameter sections are created within the inner opening section to provide different local properties. The upper large-diameter portion maintains specification compatibility while the lower small-diameter portion minimizes dead space, allowing each local region to optimize for its specific requirement.
2Productivity
If the inner container body is deformed by external pressure to expel content, then content discharge is improved, but a hollow space (dead space) remains that cannot be completely eliminated
Solution Approach 1:
The air passage is pre-configured to introduce outside air into the space between the inner container body and outer shell bottle before content expulsion begins. This preliminary air introduction prepares the system to push remaining content toward the opening section as the inner container body deforms under pressure.
Solution Approach 2:
Outside air introduced through the air passage acts as an intermediary substance that pushes the viscous content toward the opening section during deformation. The air pressure facilitates the expulsion of remaining content from the dead space area that cannot be directly compressed.
3Duration of action of stationary object
If the outer shell bottle restores its original shape after pressure release, then container reusability is improved, but the inner container body remains deformed maintaining the dead space
Solution Approach 1:
The system utilizes dynamic deformation of the inner container body while the outer shell bottle maintains its static, reusable structure. The inner container body can be repeatedly deformed and restored, while the differential restoration behavior between the two containers creates the necessary conditions for complete content expulsion over multiple cycles.
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 design effectively reduces dead space within the multilayer bottle, allowing for complete expulsion of content while maintaining the outer opening section's dimensions and reducing resin usage, thus enhancing cost efficiency and handling stability.
Implementation Method 1
an outer shell bottle which has a cylindrical outer opening section, a shoulder section continuing from the outer opening section, a body section continuing from the shoulder section, and a bottom section continuing from the body section, and which can restore an original shape thereof with respect to an external pressure
Implementation Method 2
an inner container body which has a cylindrical inner opening section provided inside the outer opening section of the outer shell bottle, and an inner container main body which continues from the inner opening section, which is shaped along an inner surface shape of the outer shell bottle, and which deforms in response to an external pressure
Implementation Method 3
an air passage which is formed between the outer opening section and the inner opening section and which introduces outside air between the outer shell bottle and the inner container body
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
Provided is a synthetic resin-made multilayer bottle in which a dead space can be reduced without being affected by the specifications of an outer opening section. A synthetic resin-made multilayer bottle (1) includes: an outer shell bottle (2) having a shoulder section (5) continuing from an outer opening section (4), and a body section (6) continuing from the shoulder section (5); a synthetic resin-made inner container body (3) having a cylindrical inner opening section (17) provided inside the outer opening section (4) of the outer shell bottle (2), and an inner container main body (18) continuing from the inner opening section (17), shaped along an inner surface shape of the outer shell bottle (2), which deforms by an external pressure; and an air passage (23) formed between the outer opening section (4) and the inner opening section (17) and which introduces outside air between the outer shell bottle (2) and the inner container body (3). The inner circumferential surface of the inner opening section (17) is provided with a small-diameter section (24) having a diameter smaller than the inner diameter of the open end of the inner opening section (17).