Partial Preheating for Heat-Sealable Packaging Materials
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Solution Overview
Problem
Existing packaging technologies face challenges in achieving a tight seal with sensitive packaging materials like paper or biodegradable plastics, often resulting in leaks due to inadequate heat conduction and overheating issues, especially when using barrier layers or thicker film composites.
Innovation Solution
A method and device for packaging and sealing small items using partial preheating of heat-sealable packaging materials, where the packaging is heated locally in the sealing area compared to the functional area, reducing the heat input required for sealing and preventing overheating, allowing for the use of conventional sealing tools and sensitive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing tools with heated sealing jaws are used, then sealing can be achieved quickly, but the packaging material may be overheated or insufficiently melted resulting in leaks
Solution Approach 1:
The packaging material is preheated in a first heating zone before reaching the sealing zone. This preliminary heating action reduces the temperature difference between the sealing tool and the material, enabling more controlled and uniform melting without overheating the outer film layers.
Solution Approach 2:
The heating process is divided into distinct zones: a first heating zone for preheating the packaging material, and a separate sealing zone where the actual sealing occurs. This segmentation allows independent optimization of each zone's temperature and exposure time parameters.
2Productivity
If the sealing jaws use high temperature for quick sealing, then productivity is improved, but the packaging material quality deteriorates due to overheating
Solution Approach 1:
The packaging material receives preliminary heating in a dedicated preheating zone before reaching the sealing jaws. This advance preparation reduces the required sealing time and temperature, maintaining high productivity while preventing overheating damage to the material.
Solution Approach 2:
Different regions of the packaging material receive different heating treatments: the sealing area is preheated to an optimal temperature range, while other areas remain at ambient temperature. This localized quality control ensures proper sealing without affecting the overall material integrity.
3Reliability
If barrier layers are added to packaging material, then protection is improved, but heat conduction is reduced making sealing difficult
Solution Approach 1:
The packaging material with barrier layers is preheated in a first heating zone before reaching the sealing zone. This preliminary action compensates for the poor heat conduction properties of barrier layers by providing thermal energy in advance, allowing the sealing process to proceed effectively without excessive energy input during sealing.
4Reliability
If the packaging material is heated uniformly, then all areas reach sealing temperature, but the functional area contacts the article at wrong temperature
Solution Approach 1:
The heating system applies heat locally to specific zones: the sealing areas are heated to melting temperature, while the functional area that will contact the article is either not heated or heated to a lower temperature. This spatial differentiation of thermal properties ensures proper seal formation without exposing temperature-sensitive articles to harmful heat.
Solution Approach 2:
The heating process is segmented into a first heating zone for sealing areas and excludes the functional area. This segmentation allows the sealing zones to reach appropriate temperatures while the functional area remains at ambient or lower temperature, preventing thermal damage to temperature-sensitive products.
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
This approach ensures a tight seal with reduced heat input, preventing leaks and preserving temperature-sensitive products by exploiting the 'early sealing' property of films without overheating, and can process a variety of packaging types, including those with barrier layers or thicker composites.
Implementation Method 1
Application of heat energy to the packaging material so that the packaging material is heated (locally) in a sealing area compared to a different functional area
Implementation Method 2
The heat input required to melt the sealing area is not only achieved during the sealing process itself
Data Source
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AI summary
The invention relates to a method and a device for packaging and sealing small items in partially preheated, heat-sealable packaging. To ensure a tight seal, particularly for novel, sensitive packaging made from sustainable raw materials, e.g., packaging made of paper or biodegradable plastic or monomaterials, or packaging with a barrier layer, the method according to the invention comprises the following steps: - Step A: Providing a heat-sealable packaging (P). - Step B: Providing the small items, preferably in a row along at least one web of the item. - Step C: Applying heat energy to the packaging (P) so that the packaging (P) heats up in a sealing area (PL, PQ) compared to a different functional area (PF). - Step D: Forming a package around at least one of the items from the heat-treated packaging (P).- Step E: Sealing the packaging in the sealing area (PL, PQ) of the packaging material (P).