Rotatable Sealing Insert for Thermoplastic Film Welding
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Solution Overview
Problem
Existing packaging machines require the replacement of entire sealing jaw assemblies when switching between different film web materials or when sealing surfaces wear out, leading to inefficiencies and additional costs due to the need for specialized coatings.
Innovation Solution
A reversible insert with multiple sealing surfaces, including coated and uncoated options, can be rotated and fixed into different sealing positions within the jaw body, allowing for the use of various sealing surfaces without replacing the entire device, and featuring a non-stick coating to prevent plastic adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire sealing jaw assembly is replaced when switching between different film web materials or when sealing surfaces wear out, then the welding quality can be maintained, but the device complexity and maintenance costs increase
Solution Approach 1:
The sealing jaw assembly is segmented into a jaw body and a separate insert with the sealing surface. The insert can be independently replaced or rotated to present different sealing surfaces, while the jaw body remains in place. This segmentation allows maintenance and material switching without replacing the entire assembly, reducing complexity while maintaining welding quality.
Solution Approach 2:
The insert is designed with multiple sealing surfaces that can be presented by rotating the insert to different angular positions. This multi-functionality allows a single insert to serve multiple material types and welding requirements, eliminating the need for multiple separate sealing jaws and reducing overall device complexity.
2Reliability
If specialized coatings are applied to sealing surfaces for different film web materials, then the welding quality for specific materials is improved, but the maintenance costs and replacement frequency increase
Solution Approach 1:
The insert incorporates multiple sealing surfaces with different coatings (e.g., Teflon-coated and uncoated surfaces) that can be rotated into position based on the film web material being welded. This allows a single insert to handle multiple material types without requiring frequent replacement or re-coating, improving productivity while maintaining specialized welding quality for each material type.
3Adaptability or versatility
If exchangeable sealing surface parts are provided on a heatable sealing jaw, then the adaptability to different materials is improved, but the device complexity increases due to additional replacement mechanisms
Solution Approach 1:
The insert is designed to be rotatable about an axis, allowing dynamic switching between different sealing surfaces by simply rotating the insert to different angular positions. This dynamic mechanism is simpler than complete disassembly and replacement systems, as it maintains the insert in place while presenting different functional surfaces, thereby improving adaptability without significantly increasing device complexity.
4Ease of operation
If a non-stick coating is applied to the sealing surface, then the ease of operation is improved by preventing plastic adhesion, but the manufacturing complexity increases due to specialized coating requirements
Solution Approach 1:
The insert includes both Teflon-coated sealing surfaces (for non-stick properties) and uncoated sealing surfaces (for materials requiring direct thermal contact). By rotating the insert, the appropriate surface type is presented for each material, achieving ease of operation for different materials without requiring complex selective coating processes on a single surface.
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
Enables seamless switching between different film types without replacing the device, extends the life of sealing surfaces, and reduces maintenance costs by allowing the use of existing surfaces until worn, ensuring reliable and efficient welding operations.
Implementation Method 1
a heating device for heating the sealing surface or surfaces in order to be able to melt and weld the plastic
Implementation Method 2
a non-stick coating is applied to at least one sealing surface. Reliable welding, for example, of a monofoil with a permanently coated sealing surface is thus made possible without the melted plastic adhering to the sealing surface.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A device designed for welding thermoplastic materials, in particular a film web (14), comprises a jaw body (1), at least one sealing surface (5) on the jaw body (1), and a heating element (6) for heating the sealing surface (5) in order to melt and weld the plastic material in thermal contact with the sealing surface (5). An insert (10) is inserted into the jaw body (1). The sealing surface (5) on the insert (10) is oriented in a sealing position. In order to be able to use a different sealing surface (8), which, for example, has a different coating, without replacing the jaw body (1), it is proposed that at least one further sealing surface (8) be provided on the insert (10), which can be brought into the sealing position by turning the insert (10).