Shrink Tunnel Shaft Wall Control for Variable Film Width
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Solution Overview
Problem
The existing shrink packaging process is prone to quality inconsistencies due to deviations in the dimensioning of thermoplastic packaging material, leading to wrinkles, tears, or insufficient stability in holding items together, as the process parameters like hot gas flow direction, temperature, and shaft wall openings are not adaptable to variations in material size.
Innovation Solution
A packaging device and method that utilize a control and/or regulating device to adjust the position of shaft walls in the shrink tunnel based on real-time measurements of the thermoplastic packaging material's width, ensuring a constant target distance and maintaining quality by actuating the position of shaft walls obliquely or perpendicularly to the material's direction of movement, using sensors and actuators to maintain optimal alignment and spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fixed process parameters and shaft wall positions are used in the shrink tunnel, then the device structure is simple and easy to operate, but the shrinkage quality becomes inconsistent when thermoplastic packaging material dimensions deviate from specifications
Solution Approach 1:
The patent applies the dynamics principle by making the shaft walls adjustable in position. The shaft walls can be moved perpendicular to the direction of material flow to accommodate variations in thermoplastic packaging material width. This dynamic adjustment capability allows the shrink tunnel to maintain optimal process parameters despite material dimension deviations, thereby improving shrinkage quality without requiring complete system redesign.
Solution Approach 2:
The patent implements parameter changes by allowing modification of shaft wall positions based on actual material dimensions. The system monitors thermoplastic packaging material width and adjusts corresponding shaft wall positions to maintain appropriate spacing and hot gas flow characteristics. This parameter adjustment ensures consistent shrinkage quality even when material dimensions vary within tolerance ranges.
2Adaptability or versatility
If the shaft wall positions are fixed to match specified material dimensions, then the device is easy to manufacture and operate, but it cannot adapt to material dimension deviations causing wrinkles, tears, or insufficient stability
Solution Approach 1:
The patent employs feedback control by monitoring the actual width of thermoplastic packaging material and using this information to adjust shaft wall positions. Sensors detect material dimensions and provide feedback to the control system, which then actuates the shaft walls to appropriate positions. This closed-loop feedback mechanism enables the system to adapt to material variations automatically while maintaining straightforward operation through automated control.
Solution Approach 2:
The system implements self-service by automatically adjusting shaft wall positions based on detected material dimensions without requiring manual intervention. The control device autonomously processes sensor data and actuates the shaft walls to optimal positions, enabling the system to self-correct for material dimension variations and maintain consistent shrinkage quality.
3Manufacturing precision
If process parameters are kept constant for simplicity, then energy consumption is lower and operation is easier, but shrinkage result quality deteriorates due to material dimension variations
Solution Approach 1:
The patent applies dynamics by implementing adjustable shaft wall positions that respond to material dimension variations. This dynamic adjustment allows the system to maintain optimal hot gas flow characteristics and shrinkage conditions without requiring excessive energy input. The selective adjustment of shaft wall positions based on actual material needs ensures energy is used efficiently only when and where required.
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 consistent quality of the shrunk packaging material over time, even with deviations in material size, by dynamically adjusting the shaft wall positions to match the actual width of the thermoplastic material, thereby maintaining stability and preventing wrinkles or tears.
Implementation Method 1
articles with applied thermoplastic packaging material are moved through a shrink tunnel, where the thermoplastic packaging material is shrunk onto the respective assembly of articles. The hot gas flow is directed against the thermoplastic packaging material... the thermoplastic packaging material is shrunk onto the articles
Data Source
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AI summary
A packaging device (1) for producing shrink-wrapped packages is disclosed. The packaging device (1) comprises a shrink tunnel (30) with at least one shaft wall (32, 33, 34), which is formed for introducing shrink medium into the shrink tunnel (30) and along which at least one shaft wall (32, 33, 34) articles (15) for shrinking thermoplastic packaging material (9) through the shrink tunnel (30) are movable. The packaging device (1) further comprises a control and/or regulating device (S) and at least one sensor (20) via which at least one sensor (20) of the control and/or regulating device (S) can be provided with information on a width of the thermoplastic packaging material (9) over which width the thermoplastic packaging material (9) extends perpendicular to its direction of movement (BR) when moving through the shrink tunnel (30).The control and/or regulating device (S) is connected to at least one actuator and is designed such that the control and/or regulating device (S), taking into account the information provided via the at least one sensor (20), can set a position of the at least one shaft wall (32, 33, 34) obliquely and/or perpendicular to the direction of movement (BR) along which direction of movement (BR) the thermoplastic packaging material (9) is moved through the shrink tunnel (30), via the at least one actuator.