Two-Part Induction Heat-Seal Closure Liner for Controlled Dispensing
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Solution Overview
Problem
Existing heat-sealable liners for containers are complex and costly to manufacture, often requiring multiple lamination steps and release coatings, and their pull tabs can interfere with insertion and sealing, while also being prone to rupture or delamination, and they do not provide a restricted product orifice for controlled dispensing.
Innovation Solution
A vertically stacked two-part closure liner assembly with a primary and secondary liner, where the secondary liner is smaller than the container rim, allowing for tamper-evident sealing and controlled product dispensing through a restricted orifice, either by peeling or broaching, without interfering with insertion or heat sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pull tab is added to facilitate liner removal, then ease of operation is improved, but device complexity increases and reliability deteriorates due to tab rupture or delamination
Solution Approach 1:
The patent removes the pull tab feature entirely from the liner design. Instead, the closure cap itself provides the removal function through its engagement with the liner's outer periphery, allowing the user to grip and remove the entire closure assembly without needing a separate tab structure on the liner.
Solution Approach 2:
The closure cap serves multiple functions: it provides the pull mechanism for removal, maintains the seal during storage, and structurally supports the liner. This multi-functional design eliminates the need for a dedicated pull tab while improving overall system reliability.
2Ease of operation
If a pull tab is added to facilitate liner removal, then ease of operation is improved, but reliability worsens due to tab rupture or disconnect before heat seal rupture
Solution Approach 1:
The patent eliminates the pull tab structure that caused reliability issues. The closure cap's engagement with the liner's outer periphery provides a more reliable removal mechanism that distributes stress across the entire liner perimeter rather than concentrating it at a tab attachment point.
3Adaptability or versatility
If the product orifice is made smaller for restricted dispensing, then product control is improved, but manufacturing precision requirements increase
Solution Approach 1:
The restricted product orifice is pre-formed in the liner during the lamination process, before the closure is assembled. This preliminary formation of the orifice in a controlled manufacturing environment ensures consistent dimensions without requiring high-precision operations during final assembly.
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 provides a simplified, cost-effective, and reliable closure liner assembly that ensures tamper-proofing and controlled product dispensing, reducing manufacturing complexity and preventing interference with the sealing process.
Implementation Method 1
the closure is then passed under a heat sealer that bonds (via induction heating) the liner to the rim of the container
Implementation Method 2
melts a layer (e.g., wax) between the heat seal liner and backing liner so that when the user removes the closure, the backing liner remains in the closure
Data Source
AI summary
An induction heat-sealed closure liner assembly having a restricted product orifice that is smaller than the mouth of the container to which the assembly is attached, to allow restricted dispensing of product through the orifice. The closure assembly is designed for storing and dispensing a product, such as a solid, liquid or paste product, and includes primary and secondary liner components that are positionable within a retainer portion of a cap to form the closure liner assembly.