Single Facer Corrugating Roller Suction and Adhesion Control
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Solution Overview
Problem
Current single facers for producing corrugated paperboard face issues such as high air consumption, thermal losses, and difficulties in maintaining the corrugated paper sheet's adhesion to the corrugating roller, leading to detachment and breakages during the corrugating and gluing process.
Innovation Solution
A single facer design featuring a corrugating roller with annular grooves and laminar members that reduce air suction, combined with a guiding element to extend the contact arch of the corrugated paperboard with the roller, optimizing gluing conditions and facilitating detachment by minimizing airflow and thermal losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If suction systems are used to keep the corrugated paper sheet adhering to the corrugating roller, then the paper sheet adhesion is improved, but air consumption increases and thermal losses occur
Solution Approach 1:
The invention applies suction only in specific localized areas where paper adhesion is critical (at the corrugating nip and pressure nip), rather than using continuous circumferential suction. This localized approach maintains reliable paper sheet adhesion at key points while minimizing overall air consumption and thermal losses from heating the corrugating roller.
Solution Approach 2:
The suction system is segmented into multiple independent suction boxes positioned at different locations around the corrugating roller circumference. Each suction box operates independently with its own suction duct, allowing selective activation of suction only where needed, thereby reducing total air consumption compared to a continuous suction system.
2Reliability
If high air suction is applied to maintain paper adhesion, then detachment prevention is improved, but thermal energy from the corrugating roller is lost
Solution Approach 1:
Suction is applied locally only at critical adhesion zones (corrugating nip and pressure nip areas) rather than continuously around the entire roller circumference. This localized suction prevents paper detachment at key points while minimizing the volume of air that absorbs thermal energy from the heated corrugating roller, thus preserving thermal energy.
Solution Approach 2:
The invention uses partial suction action - activating suction only in specific segments where paper adhesion is critical, rather than applying full circumferential suction. This partial action is sufficient to prevent detachment at key points while significantly reducing the total air flow that would otherwise absorb thermal energy from the roller.
3Reliability
If conventional suction systems are used, then paper adhesion is maintained, but the system complexity increases
Solution Approach 1:
The suction system is divided into multiple independent suction boxes, each with its own suction duct and control. This segmentation allows each unit to be simple in design while the overall system achieves reliable paper adhesion through coordinated operation of multiple simple components, rather than requiring one complex continuous suction system.
Solution Approach 2:
The invention extracts and removes the unnecessary complexity from conventional continuous suction systems by eliminating the need for complex sealing systems and continuous air flow control. Instead, multiple simple suction boxes are positioned at critical points, each independently providing suction only where needed, simplifying the overall system architecture.
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
The solution reduces energy consumption, improves gluing efficiency, and eases the detachment of the corrugated paperboard from the roller, minimizing breakages and jamming, while maintaining effective adhesion during the process.
Implementation Method 1
a suction box (41) is also arranged downstream of the pressing member and upstream of the first corrugating roller, with respect to the direction of rotation of the second corrugating roller. The suction box (41) defines a suction area around the second corrugating roller (9). The suction box (41) generates a suction in the annular grooves (31)
Implementation Method 2
This latter is heated to facilitate corrugating and gluing. The presence of suction ducts results in a loss of thermal energy from the corrugating rollers
Data Source
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AI summary
The single facer (2) comprises a first corrugating roller (7) with a first rotation axis (A) and a second corrugating roller (9) with a second rotation axis (B). The two corrugating rollers form a corrugating nip (11), through which a paper sheet (F1) passes. The single facer also comprises a pressing member (13), co-acting with the second corrugating roller (9) and forming a pressure nip (21) therewith, as well as a glue applicator (23) co-acting with the con il second corrugating roller (9). With the second corrugating roller (9) a suction box (41) is associated, extending approximately parallel to the axis (B) of the second corrugating roller (9) and defining a suction area around the second corrugating roller (9). A series of laminar members (33), each of which is inserted in one respective of said annular grooves (31) of the second corrugating roller (9), are arranged between the pressing member (13) and the first corrugating roller (7) and extend in the respective annular grooves (31) towards the suction box (41).