Two-Side Adherable Induction Heating Sealing Member for Cosmetic Containers
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Solution Overview
Problem
Conventional container sealing methods fail to provide effective tamper evidence and heat resistance, leading to leakage and evaporation issues due to inadequate sealing of contents, especially in compact cosmetic containers and flip-cap containers.
Innovation Solution
A two-side adherable high-frequency induction heating container sealing member is developed, integrating both the upper and lower surfaces of the container cover and container, using a layered structure with thermal-adhesion resin layers and aluminum foil for secure sealing and tamper evident functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional thermal container sealing member made of aluminum material is used to seal the upper end surface of the cover ring, then the sealing function is provided, but the sealing member cannot withstand high temperature of 50 to 80°C and is spontaneously peeled from the cover ring, resulting in loss of heat resistance and sealing reliability
Solution Approach 1:
The sealing member uses a composite structure with a base layer (polyester or polypropylene film) and a thermal adhesion layer (heat-sealing adhesive). This composite material provides both the structural integrity needed for sealing reliability and the thermal adhesion properties needed to withstand high temperatures of 50 to 80°C without peeling.
Solution Approach 2:
The invention changes the material parameters by selecting specific polymers (polyester or polypropylene) with appropriate melting points and thermal stability, and using heat-sealing adhesives with high-temperature resistance. These parameter changes enable the sealing member to maintain adhesion strength at elevated temperatures while providing reliable sealing.
2Reliability
If a conventional sealing method is used to seal the upper end surface of the cover ring, then the sealing function is provided, but pin hole phenomenon occurs causing contents to leak or evaporate, resulting in functional problems
Solution Approach 1:
The composite structure with base layer and thermal adhesion layer works together to prevent pin hole formation. The base layer provides structural continuity while the thermal adhesion layer ensures uniform heat distribution and bonding, eliminating the pin hole phenomenon that causes leakage and evaporation.
3Ease of manufacture
If the cover ring is assembled by physically applying force to fit it on the container, then the assembly is completed, but air-tight sealing is not kept perfectly due to insufficient pressure application or dimensional tolerance, resulting in leakage
Solution Approach 1:
The invention replaces the mechanical assembly method (physically applying force to fit cover ring) with a thermal bonding method. The heat-sealing adhesive layer is activated by heat during or after assembly, creating a strong bond that ensures air-tight sealing even with minor dimensional variations or insufficient mechanical pressure.
4Reliability
If a thermal-adhesion sealing strip remains on the upper end surface of the cover ring after opening, then the sealing function is fulfilled, but the appearance is poor
Solution Approach 1:
The thermal adhesion layer is positioned and sized to provide sealing function only where needed (at the interface between cover ring and container), rather than covering the entire upper end surface. This localized application ensures sealing reliability while maintaining aesthetic appearance by minimizing visible residue after opening.
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 solution ensures complete prevention of leakage and evaporation, provides a robust and safe product with a tamper evident function, allowing for easy opening while maintaining a clean and aesthetically pleasing appearance.
Implementation Method 1
two-side adherable high-frequency induction heating container sealing member
Implementation Method 2
heat-sealable by high frequency induction heating
Implementation Method 3
a first thermal-adhesion resin layer from the top to the bottom successively; and the upper layer having a preformed opening guide cut line
Data Source
Figure 1~3
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Figure 7~8
AI summary
The present disclosure relates to a two-side adherable high-frequency induction heating container sealing member, the sealing member comprising: an upper layer that comprises a first thermal-adhesion sealing layer, a first aluminum foil layer, an intermediate base layer, a synthetic resin layer having tensile strength and hardness, and a first thermal-adhesion resin layer, which are successively formed from the top to the bottom, the upper layer having a preformed opening guide cut line-provided opening tab, a preformed opening guide cut strip, and a preformed thermal-adhesion sealing strip; and a lower layer that is formed beneath the upper layer and comprises a second aluminum foil layer and a second thermal-adhesion sealing layer, which are successively formed from the top to the bottom, wherein the first thermal-adhesion resin layer of the upper layer is integrated with the second aluminum foil layer of the lower layer through thermal adhesion.