Heating Stamp Temperature-Curve Monitoring for Fragile Container Sealing

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Solution Overview

Problem

Existing container sealing methods require pressure application, which can be detrimental to fragile containers or increase device size in miniaturized systems, and lack effective monitoring of sealing quality.

Innovation Solution

A method using a control unit to monitor the temperature over time curve of a heating stamp during the sealing process, comparing it to a reference value to determine the sealing quality, without requiring pressure, and optionally incorporating force sensors for additional verification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pressure is applied to the foil during sealing, then sealing reliability is improved, but device complexity increases and fragile containers may be damaged

Engineering Contradiction:

Improvesealing reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical pressure application system with a thermal field-based sealing mechanism. The heating stamp applies heat to the foil to activate the adhesive, eliminating the need for complex force monitoring and pressure control systems while achieving reliable sealing through thermal activation rather than mechanical compression.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the sealing mechanism from pressure-dependent to temperature-dependent. By controlling the temperature parameter of the heating stamp, the system achieves reliable sealing without requiring pressure application, thereby simplifying the device while maintaining sealing quality.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If force monitoring is included in miniaturized sealing devices, then sealing quality is improved, but device size increases

Engineering Contradiction:

Improvesealing qualityVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The patent eliminates the need for force monitoring sensors in miniaturized devices by replacing mechanical force measurement with thermal field monitoring. The heating stamp's temperature and the resulting adhesive activation provide sufficient information for quality control without requiring additional force sensing components that would increase device size.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent extracts the monitoring function from mechanical force measurement and relocates it to thermal parameter measurement. By monitoring temperature rather than force, the system achieves quality control in miniaturized devices without the space constraints imposed by force sensors.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If pressure is applied during sealing, then sealing reliability is improved, but fragile containers or foil may be damaged

Engineering Contradiction:

Improvesealing reliabilityVSAvoidpressure stress damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent substitutes mechanical pressure application with thermal activation. The heating stamp applies heat to the foil to activate the adhesive bonding, completely eliminating pressure stress on the container and foil while maintaining sealing reliability through thermal-controlled adhesive activation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent converts the potential harm of pressure stress into a beneficial thermal activation process. By using heat to activate the adhesive rather than pressure to bond the components, the system achieves reliable sealing without damaging fragile containers or foil, turning a potentially harmful mechanical process into a beneficial thermal one.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Ensures reliable sealing without pressure, reduces device size, and enhances automation by monitoring sealing quality through temperature and force control.

Implementation Method 1

the heating stamp is heated, therefore partially melting the foil or an adhesive layer of the foil

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

partially melting the foil or an adhesive layer of the foil

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 3

at least one temperature sensor for monitoring a temperature of the heating stamp

Methodology Applied

Scientific EffectTemperature monitoring:

Data Source

PatentEP4371741B1Method for monitoring the sealing of a container and device with improved sealing monitoring

Publication Date: 2026.01.21 F HOFFMANN LA ROCHE & CO AG

Figure 1
Figure 2A~2B
Figure 2C~2D

AI summary

A method for monitoring the sealing of a container in system or device comprising the following steps: controlling the heating element (5) to heat a heating stamp (3) to a predetermined sealing temperature, monitoring the temperature of the heating stamp (3), determining a temperature over time curve (TT) of the heating stamp (3) by means of at least one temperature sensor (9), determining at least one characteristic of the temperature over time curve (TT), comparing the determined at least one characteristic of the temperature over time curve (TT) with a reference value, and a sealing property of the sealing of the container based on said comparison of the determined at least one characteristic of the temperature over time curve (TT) with the reference value.