Tamper-Resistant Container Crowning via Heat-Sealed Plastic Coating
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Solution Overview
Problem
Existing tamper-proof closure systems for bottles face challenges in achieving strong adhesion between metal overcaps and glass necks under industrial conditions, leading to potential damage and reduced production rates, especially when using cold-curing adhesives which can cause defects like drips on the bottle surface.
Innovation Solution
A method involving a heat-sealable plastic material coated on the inner surface of the overcap's skirt, which undergoes irreversible adhesion when heated to a specific temperature, ensuring strong and irreversible bonding with the bottle neck, utilizing induction heating and radial compressive forces to maintain intimate contact and prevent folding or separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cold-curing adhesive is used to bond the metal skirt to the glass neck, then adhesion is achieved, but defects like drips appear on the bottle surface and production rate decreases
Solution Approach 1:
The patent changes the temperature parameter from room temperature (cold-curing) to elevated temperature (heat-sealable). The heat-sealable plastic material is applied at room temperature but activated at elevated temperature to create strong adhesion, eliminating the drip defect while maintaining industrial production rates
Solution Approach 2:
The patent replaces the chemical cold-curing adhesive system with a thermal heat-sealable plastic material system. Instead of relying on chemical curing that causes drips and requires slow drying times, the plastic material is activated by heat to create strong adhesion rapidly, improving both reliability and productivity
2Reliability
If strong adhesion is achieved through heat-sealable plastic material, then tamper-proof closure is ensured, but local melting of the skirt may occur
Solution Approach 1:
The patent applies heat-sealable plastic material only to the inner surface of the skirt that will contact the glass neck, creating a localized functional zone. This localized application ensures strong adhesion only where needed while leaving the rest of the skirt unaffected, preventing local melting
Solution Approach 2:
The heat-sealable plastic material acts as an intermediary layer between the metal skirt and glass neck. This intermediary material provides the necessary adhesion through heat activation while protecting the skirt from direct thermal damage to the glass, preventing local melting of the skirt structure
3Reliability
If the skirt is compressed firmly on the neck, then adhesion is improved, but the packaging line may be damaged
Solution Approach 1:
The patent changes the compression parameter by applying compression only during the brief heat-sealing process rather than continuous compression. The compression force is applied radially during heating to ensure intimate contact for adhesion, then released, preventing damage to the packaging line while achieving strong adhesion
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 achieves a reliable, irreversible adhesion that prevents fraudulent removal of the overcap without damaging the packaging line or reducing production rates, ensuring the overcap remains securely attached without causing defects like local melting.
Implementation Method 1
said skirt comprises, on at least part of its inner surface, a so-called 'coated zone', covered with a heat-sealable plastic material
Implementation Method 2
when it is brought to a certain temperature, called the sealing temperature... presents, after returning to the room temperature, a strong and irreversible adhesion with the container material
Implementation Method 3
at least the annular area under compression is heated
Data Source
AI summary
The present invention relates to a method for crowning a container, wherein a container (10) having a neck (11) and a crown cap (30) with an apron is provided, the neck of said container with said crown cap is covered, said crown cap (30) is clamped onto said neck, and said container (10) having said crown cap is removed, characterized in that, in order to obtain a tamper-resistant closing of said container, a) said apron includes an area (31) covered with a plastic material layer that is heat-sealable at a sealing temperature greater than 45°C; b) after placing and clamping said apron onto said neck, said apron is compressed onto the neck by means of an external tool (100) that is radially engageable with said covered area (31); c) while maintaining said compression, said compressed covered area is heated such that said layer reaches said sealing temperature; and d) the heating is stopped, compression is stopped, and the neck (11) is freed from said external tool (100).