Creping Roller Drive Mechanism for Structured Belt Tension Control
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Solution Overview
Problem
Existing machines for producing fibrous webs face challenges with speed differences between creping and backing rolls, leading to high load on the structured belt, reduced runnability, and adverse effects on paper quality.
Innovation Solution
The creping roller and backing roll have their own drives, with the creping roller pressed against the counter-roller via a pivoting lever, and the structured belt is guided by driven rollers to maintain tension and reduce frictional influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the creping roller is pressed against the counter-roller using a swivel lever, then the creping function is achieved, but the frictional force adversely affects the line force in the crepe gap
Solution Approach 1:
The patent replaces the traditional swivel lever mechanical system with a directly driven creping roller system. The creping roller is equipped with its own drive mechanism, eliminating the need for friction-based force transmission through a swivel lever. This substitution removes the adverse frictional effects on the line force while maintaining the creping function through direct mechanical driving.
2Manufacturing precision
If a speed difference is maintained between the creping roll and backing roll, then the desired crepe factor is achieved, but high load is placed on the structured belt
Solution Approach 1:
The patent replaces the indirect friction-based speed differential mechanism with direct independent drives on both the creping roller and backing roll. This allows precise control of the speed difference needed for achieving the desired crepe factor while eliminating the excessive load on the structured belt that occurs in traditional friction-based systems.
Solution Approach 2:
The patent changes the operational parameters by equipping the creping roller with its own drive, allowing independent speed control. This enables optimization of the speed difference parameter to achieve the required crepe factor while minimizing the load on the structured belt through controlled, rather than friction-dependent, speed differential.
3Ease of operation
If the structured belt is used as the crepe belt, then the creping process is enabled, but the stability of the belt run is reduced due to high load
Solution Approach 1:
The patent replaces the friction-based belt loading system with a directly driven creping roller system. This substitution maintains the creping process functionality while dramatically improving belt run stability by eliminating the high loads and frictional stresses that cause belt instability in traditional configurations.
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 minimizes stress on the structured belt, optimizes belt stability, reduces vibration, and enhances paper quality by maintaining uniform tension and reducing the impact of speed differences on contact pressure.
Implementation Method 1
the fibrous web is guided through a press nip formed between a press unit and a backing roll and then through a creping nip that is between the backing roll and one of a structured belt
Implementation Method 2
the speed of the creping belt is lower than that of the transfer roller
Data Source
Figure 1
AI summary
Disclosed is a machine for producing a fiber web, particularly a tissue web or toilet tissue web. In said machine, the fiber web is guided through a press nip that is formed between a pressing unit and an opposite roll and is then guided through a creping nip which is formed between the opposite roll and a creping roll that is surrounded by a structured belt. The creping roll is provided with an independent drive unit and can be pressed against the opposite roll via a swiveling lever whose swivel shaft that runs parallel to the shafts of the creping roll and the opposite roll is disposed on a plane extending perpendicular to said shafts in such a way that the joining line between the swivel shaft and the shaft of the creping roll forms an angle of approximately 90° along with the joining line between the shaft of the creping roll and the shaft of the opposite roll.