Four-Roller Rewinding Machine for Web Material Logs
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Solution Overview
Problem
Existing automatic continuous peripheral rewinding machines for producing logs of web material, such as toilet tissue or kitchen towels, face challenges in ensuring consistent operation and reproducibility, particularly due to variations in material properties and winding core sizes, which affect the accuracy and reliability of the winding cycle.
Innovation Solution
A rewinding machine with four rollers, including a first, second, third, and fourth winding roller, where the third roller is positioned upstream of the nip and the fourth downstream, allowing for continuous web material feeding and a severing mechanism to pinch the web material against the first roller, generating tension beyond its breaking point to efficiently sever the material, ensuring consistent winding cycles and handling of small diameter cores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional three-roller winding configuration is used, then the machine structure is simpler, but the winding accuracy and reliability deteriorate due to inability to maintain consistent operation with material property variations
Solution Approach 1:
The winding process is segmented into two distinct zones: a first winding cradle (rollers 1, 3, 7) for initial log formation and a second winding cradle (rollers 1, 3, 8) for completing the winding cycle. This segmentation allows each zone to be optimized for specific functions, improving overall reliability while managing complexity through functional division.
Solution Approach 2:
The third winding roller (7) acts as an intermediary element that facilitates the transition of the log being formed from the first winding cradle through the nip to the second winding cradle. This intermediary roller ensures consistent operation and maintains winding accuracy by providing additional support during the critical transition phase.
2Manufacturing precision
If the web material is severed by lengthening the path between winding rollers, then the severing mechanism is simpler, but the winding accuracy and reproducibility deteriorate due to dependence on material properties
Solution Approach 1:
The traditional mechanical severing method (lengthening the web path) is replaced with a controlled differential speed mechanism. The winding rollers accelerate and decelerate in synchronism to create speed differences that cause the web material to tear at the desired location, providing precise control over severing timing and position.
Solution Approach 2:
The severing process is implemented through periodic acceleration and deceleration of the winding rollers. The rollers accelerate during the winding phase and decelerate in synchronism to create the speed differential needed for severing, repeating this cyclic action for each log production cycle with consistent timing and precision.
3Reliability
If the winding rollers rotate at controlled speed with acceleration and deceleration, then the log movement control is improved, but the energy consumption increases
Solution Approach 1:
The winding rollers operate with periodic acceleration and deceleration cycles that are synchronized to the winding and severing operations. Energy is consumed primarily during acceleration phases, while deceleration phases utilize regenerative braking or coasting, reducing overall energy consumption while maintaining precise log movement control.
Solution Approach 2:
The winding rollers are equipped with speed control mechanisms that monitor and adjust rotation speeds in real-time. Feedback from sensors detects the position and state of the log, allowing the control system to optimize acceleration and deceleration profiles, minimizing energy consumption while ensuring reliable log movement and positioning.
4Adaptability or versatility
If small diameter cores are processed, then the machine versatility is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The four-roller winding configuration with adjustable nip width and synchronized speed control creates a universal system capable of handling multiple core diameters. The same basic mechanism adapts to different core sizes by adjusting roller positions and speed profiles, eliminating the need for dedicated systems for different core dimensions.
Solution Approach 2:
Traditional mechanical detection methods for small cores are replaced with non-contact sensing technologies. Optical sensors or other detection systems monitor the position and dimensions of small diameter cores without physical contact, eliminating measurement difficulties associated with mechanical probes and improving detection accuracy for minimal core sizes.
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 configuration enables continuous and efficient production of logs with improved winding accuracy and reliability, maintaining constant web material feed speed independent of the winding cycle, and effectively processing small diameter cores without interrupting the material flow.
Implementation Method 1
a severing mechanism configured and controlled to pinch the web material against the first winding roller and sever the web material by generating in the web material a tension greater than the breaking point of the web material
Data Source
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AI summary
The rewinding machine comprises a first winding cradle formed be- tween a first winding roller (1), a second winding roller (3) and a third winding roller (7). The first winding roller and the second winding roller define a nip (5) through which there pass the winding cores (A) with the web material (N) being wound around them;The rewinding machine also comprises a feed path of the winding cores that pass between the first winding roller (1) and the third winding roller (7). A second winding cradle is formed between the first winding roller (1), the second winding roller (3) and a fourth winding roller (8). The rewinding ma- chine also comprises a rolling surface (19) extending around the first winding roller (1) and defining a feed channel (21) of the winding cores.