Unwinding Machine Bonding Joint Preparation for Seamless Strip Connection
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Solution Overview
Problem
Existing unwinding machines fail to meet the requirement of higher speeds while ensuring a perfect connection between reels, leading to inefficiencies in the cutting and gluing process.
Innovation Solution
The method involves preparing the end of a new reel with a bonding joint in masked time, applying a second bonding joint to the ending strip, and then cutting and gluing the strips while bringing the connection assemblies together, allowing for a seamless transition and reduced connection time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection of strips is carried out during a temporary stop in known unwinding machines, then the connection can be made with a reserve of strip, but the productivity is reduced due to the interruption of the unwinding process
Solution Approach 1:
The bonding joints are prepared in advance on the connection assemblies while the reels are still rotating and strips are being fed. The first bonding joint is applied to the new strip and the second bonding joint is applied to the ending strip during the masked time before the actual connection operation, enabling the connection to be made quickly when the reels are stopped.
2Productivity
If the connection time is reduced to increase productivity, then the unwinding speed can be increased, but the connection quality may be compromised
Solution Approach 1:
Both bonding joints are prepared in advance during masked time on the respective connection assemblies. This preliminary preparation allows the actual connection operation to be performed quickly by simply bringing the connection assemblies together, reducing connection time while ensuring quality through pre-applied bonding joints.
Solution Approach 2:
The connection assemblies act as intermediaries that hold and position the bonding joints. Each connection assembly carries a bonding joint on its plate, and the assemblies are brought together to transfer the bonding joints between strips, ensuring precise alignment and quality connection while enabling rapid operation.
3Loss of time
If bonding joints are prepared in masked time on connection assemblies, then the connection process is simplified and connection time is reduced, but the device complexity increases due to additional connection assemblies
Solution Approach 1:
The connection assemblies serve multiple functions: they hold the reels, apply bonding joints to strips, position the strips for connection, and transfer bonding joints between strips. This multi-functionality consolidates several operations into single components, reducing overall process time despite the added structural elements.
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 enables a perfect connection between strips with a significant reduction in connection time, enhancing the overall efficiency of the unwinding process.
Implementation Method 1
The cylinder is advantageously a hollow vacuum cylinder, provided on part of its surface with perforations extending along a band parallel to a generatrix.
Implementation Method 2
a table slidably mounted parallel to the band connection assembly, on a guide support of the latter, and comprising a suction box
Data Source
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AI summary
The present invention relates to a method and device for butt cutting and gluing for a winding machine, comprising two reel-carrying elements (1) capped at their upper part by a bridge structure (2) capable of receiving a tape accumulator (3) and by two sets (4) of tape connection at rest, each assigned to a reel-carrying element (1).The method is characterized in that it essentially consists of preparing, during the masking process, the end of the new strip from a new reel (6) and fitting it with a gluing joint on a corresponding connecting assembly (4). Optionally, during the masking process, a second gluing joint is then mounted on the connecting assembly (4) corresponding to the reel (8) unwinding the finished strip. The reel (8) unwinding the finished strip is then stopped, and the new strip is joined by gluing, followed by cutting the finished strip, by bringing the connecting assemblies (4) together. The unwinding of the new reel (6) is then started. The invention is particularly applicable in the field of machines for unwinding materials into strips from reels to supply, in particular continuously, printing machines, die-cutting machines, folder-gluers, or other finishing machines.