Multi-Compartment Container With Dual-Temperature Welding
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Solution Overview
Problem
Existing methods for manufacturing containers with multiple compartments are prone to premature rupture during handling, making them unsuitable for temperature control indicators for refrigerated products, as they lack the necessary rigidity and are not designed to withstand thermal expansion.
Innovation Solution
A method involving thermal welding at two distinct temperatures to create a container with a fragile separation, using a mold to shape and stiffen the sheets, providing mechanical strength while allowing for compartment separation under stress, and using a gas to deform and shape the sheets for compartment formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single thermal welding temperature is used to create compartment separation, then the welding process is simple, but the separation is either too fragile (prone to premature rupture) or too strong (cannot rupture under stress)
Solution Approach 1:
The welding process is segmented into two distinct temperature stages: a first welding temperature that creates a strong, reliable separation resistant to premature rupture during handling, and a second welding temperature that creates a fragile separation capable of rupturing under predetermined stress. This segmentation allows each weld to serve a different functional purpose, resolving the contradiction between handling reliability and stress-responsive rupture capability.
Solution Approach 2:
Different regions of the separation are welded at different temperatures to create zones with different mechanical properties. The first welding temperature creates a strong base separation for handling reliability, while the second welding temperature creates a fragile zone that will rupture under stress. This local differentiation of welding quality allows the separation to simultaneously provide both handling strength and stress-responsive rupture.
2Ease of operation
If the container is made flexible to allow compartment rupture, then the rupture mechanism works, but the container becomes fragile during handling and shocks
Solution Approach 1:
The container structure is segmented into the rigid outer container body and the fragile internal separation. The container body is designed with high strength to resist handling shocks and provide structural integrity, while the internal separation is designed with controlled fragility to rupture under predetermined stress. This structural segmentation allows the container to simultaneously provide shock resistance and rupture capability without compromising either function.
3Strength
If the separation is made strong to withstand handling, then the container is durable, but the separation cannot rupture under predetermined stress
Solution Approach 1:
The separation function is segmented into two distinct welding zones: a first zone welded at a higher temperature that provides strength and durability during handling, and a second zone welded at a lower temperature that provides controlled fragility for rupture capability. This functional segmentation allows the separation to simultaneously exhibit both strength and controlled weakness in different regions.
Solution Approach 2:
Different portions of the separation are given different welding temperatures and thus different mechanical properties. The first welding temperature creates a strong, durable separation for handling, while the second welding temperature creates a locally fragile zone that will rupture under predetermined stress. This local quality differentiation resolves the contradiction between overall strength and localized rupture capability.
4Ease of manufacture
If existing manufacturing methods are used, then production is simple, but the container cannot withstand thermal expansion from freezing products
Solution Approach 1:
The welding process is segmented into two temperature stages, with the first welding temperature creating a strong, stress-resistant separation capable of withstanding thermal expansion forces from freezing products. This segmented approach maintains manufacturing simplicity while dramatically improving the container's ability to withstand thermal stress without compromising the separation integrity.
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 method results in a container with a fragile separation that can withstand handling and thermal pressures, allowing for controlled mixing of contents, suitable for temperature control and packaging applications.
Implementation Method 1
a first step of thermal welding carried out between two sheets so as to form the periphery of the container and carried out at a first temperature such that said welding is resistant to a predetermined stress
Implementation Method 2
after said first welding step, said two welded sheets are placed in a mold whose shape they match under the pressure of a gas
Implementation Method 3
a second step of thermal welding carried out to form at least one separation between compartments and carried out at a second temperature lower than said first temperature and such that said weld is fragile to said stress
Implementation Method 4
The freezing of the liquid products contained in the compartments causes the expansion of these products which has the effect of causing the opening of the throttle separating the two compartments
Implementation Method 5
The freezing of the liquid products contained in the compartments causes the expansion of these products
Data Source
Figure 1a~1b
Figure 1c~1d
Figure 2a~2b
AI summary
The invention concerns a method for making a container (1) comprising two or more compartments, said method including the following steps: a first step of heat sealing (S1) performed between two sheets (11, 112) so as to form the periphery of the container and performed at a temperature such that said seal (S1) is resistant to a predetermined stress, while providing filling orifices (12), a second step of heat sealing (S2) performed to form at least one separation between the compartments (13) and performed at a second temperature lower than said first temperature and such that said seal (S2) is breakable by said stress, a third step of filling said compartments (13). The invention is characterized in that after said first sealing step, the two sealed sheets (11, 112) are arranged in a mold (2, 2') whose shape they match under the pressure of a gas.