Anvil Surface Profiles for Sealing Tube Variations
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Solution Overview
Problem
Current sealing jaws for transversally sealing tubes of packaging material, particularly those used in producing aseptic packages for liquid food products, face challenges in achieving optimal sealing conditions due to variations in packaging material layers and sealing band positions, leading to potential issues like pinholes and channels.
Innovation Solution
The anvil design features distinct surface profiles on its ridges and grooves, allowing for differential pressure application on sealing bands, compensating for material layer variations and optimizing sealing conditions by interacting with the ultrasonic horn to ensure secure and consistent sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a standard anvil with uniform ridges and grooves is used for transversal sealing, then the sealing process is simple and fast, but the sealing quality deteriorates due to pinholes and channels caused by material layer variations
Solution Approach 1:
The anvil features ridges with different surface profiles (first ridge with first surface profile, second ridge with second surface profile) and grooves with different cross-sectional shapes (first groove as channel, second groove as U-shape) to apply differential pressure distribution. This local differentiation allows optimal sealing pressure on each sealing band despite material variations, resolving the contradiction between simple structure and high sealing quality.
2Reliability
If differential pressure control is implemented through complex anvil geometry, then sealing temperature and pressure control improves, but the device complexity increases
Solution Approach 1:
The patent implements differential pressure control through geometric differentiation of the anvil's ridges and grooves rather than complex mechanical or electronic systems. The first ridge and second ridge have different surface profiles, and the first groove and second groove have different cross-sectional shapes, creating inherent pressure distribution differences that improve sealing reliability while maintaining relatively simple device geometry.
Solution Approach 2:
The anvil utilizes curved surface profiles on the ridges and varied cross-sectional shapes in the grooves to naturally distribute pressure during the sealing process. The rounded and varied geometries help accommodate material layer variations and ensure consistent pressure application, improving reliability through geometric design rather than complex control mechanisms.
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 design enhances the control of sealing temperatures and pressures, reducing the formation of pinholes in one band and channels in another, thereby improving the overall sealing quality and reliability.
Implementation Method 1
Sealing jaws which heat by means of ultrasound comprise an ultrasonic horn and an anvil, which, in use, compress the tube in cooperation with one another and by activation of the ultrasonic horn the heat-seal plastic material is heated and consequently melted
Implementation Method 2
anvil, which, in use, compress the tube in cooperation with one another
Data Source
AI summary
An anvil for transversally sealing a tube having a longitudinal seam portion can include a first elongate contact surface and a second elongate contact surface. In some embodiments, the first elongate contact surface includes a first groove and the second elongate contact surface includes a second groove, each one of the first groove and the second groove being adapted to receive, in use, a respective section of the longitudinal seam portion of the tube. The first elongate contact surface can include a first seam interaction portion positioned within the first groove and having a first surface profile. The second elongate contact surface can include a second seam interaction portion positioned within the second groove and having a second surface profile. In some embodiments, the first surface profile differs from the second surface profile.