Fiber Web Unwinding Section With Pre-Join Tensioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for joining the ends of fiber webs in unwinding sections face challenges such as the use of adhesive tapes causing fiber peeling, manual handling of broke fiber webs, and inefficient handling of fiber web ends, leading to safety risks and operational inefficiencies.
Innovation Solution
An unwinding section with a tensioning device located between the joining and broke handling devices, which tensions and straightens the fiber web ends before joining, using a movable tool element and a counter element to create a form-fitting joint, and guides the cut end to broke handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive tapes are used for joining fiber web ends, then the joining process is simple, but fiber peeling occurs on the web surface
Solution Approach 1:
The patent replaces adhesive tapes with a mechanical joining system consisting of a tool element and counter element that create a form-fitting joint through compression and interlocking. This mechanical system eliminates the need for adhesives while preventing fiber peeling through controlled compression forces and geometric interlocking of the joint structure.
Solution Approach 2:
The patent changes the joining parameters by applying controlled compression force through the tool element and counter element, transforming the fiber web ends from a loose state to a compressed, interlocked state. This parameter change creates a strong joint without adhesive while maintaining fiber integrity and preventing peeling.
2Adaptability or versatility
If manual handling of broke fiber webs is performed, then flexibility in processing is maintained, but safety risks and operational inefficiencies increase
Solution Approach 1:
The patent implements self-service through automated handling where the tool element and counter element automatically position, compress, and join the fiber web ends without manual intervention. The system guides the broke fiber web through the joining process automatically, maintaining processing flexibility while eliminating safety risks associated with manual handling.
Solution Approach 2:
The patent introduces an intermediary mechanism between the fiber web ends and the operator - the automated tool element and counter element system. This intermediary handles the broke fiber web, performs the joining operation, and guides the web through the process, eliminating direct manual contact while maintaining operational flexibility.
3Productivity
If fiber web ends are not tensioned and straightened before joining, then the joining process is faster, but joining quality and reliability deteriorate
Solution Approach 1:
The patent applies preliminary action by tensioning and straightening the fiber web ends between the tool element and counter element before the actual joining compression occurs. This preliminary preparation ensures proper alignment and contact between the web ends, creating reliable joints while maintaining efficient processing speed through the integrated sequence of operations.
Solution Approach 2:
The patent merges multiple functions into the joining operation - tensioning, straightening, positioning, and compressing all occur in a single integrated process between the tool element and counter element. This consolidation maintains productivity by eliminating separate steps while ensuring joining quality through proper preparation of the fiber web ends.
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 secure and efficient joining of fiber web ends without manual handling, reducing safety risks and operational inefficiencies, and improving ergonomics by automating the process.
Implementation Method 1
the fiber web to be joined is located between the tensioning device and the joining device and is tensioned and straightened before joining of the end of the fiber web from the running-out parent roll and the end of the fiber web from the next parent roll to be unwound
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The invention relates to an unwinding section for unwinding a fiber web (W) from a parent roll, which unwinding section (10) comprises at least one unwinder (11, 12) for unwinding a fiber web (W1; W2) from a parent roll and a joining device (20, 30) configured to join a trailing end of a running-out parent roll to a beginning end of a next, new parent roll to be unwound in a parent roll change, and which unwinding section (10) comprises or is located in vicinity of a broke handling device (42) configured to handle broke. The unwinding section (10) comprises a tensioning device (45) located between the joining and the broke handling and the tensioning device (45) is configured to tension and straighten the fiber web (W2) to be joined between the tensioning device (45) and the joining device (20, 30) before joining of the end of the fiber web from the running-out parent roll and the end of the fiber web from the next parent roll to be unwound. The invention also relates to a method for joining ends of fiber webs in a parent roll change of an unwinding section (10), in which method the ends of the fiber webs (W1, W2) are configured to be joined by a joining device (20, 30). In the method the fiber web (W2) running from a next parent roll to be unwound is tensioned and straightened by a tensioning device (45) before joining of the end of the fiber web from the running-out parent roll and the end of the fiber web from the next parent roll to be unwound.