Through-Air Drum Cooling to Prevent Textile Web Adhesion
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Solution Overview
Problem
In thermal bonding plants, the textile web tends to adhere strongly to the through-air drum due to negative pressure, high temperature, and moisture loss, leading to reduced operating speed and potential damage, especially with bicomponent fibers.
Innovation Solution
A device and method where the textile web is guided over an idler drum, around a through-air drum, and then over a cooling drum, with cooling air directed onto the web before detachment from the through-air drum to induce bonding and shrinkage, allowing the web to release from the drum, using a separate air system that separates and localizes the cooling effect within the through-air drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the textile web is processed in a thermal bonding plant with negative pressure and hot air, then the bonding process is effective, but the web adheres strongly to the through-air drum
Solution Approach 1:
The invention applies preliminary anti-action by introducing cooling air to the web before it detaches from the through-air drum. This cooling action creates bonding and slight shrinkage in advance, which prevents the web from adhering to the drum surface. The cooling air is directed onto the web in the run-out region, creating a protective effect that counteracts the adhesive forces generated by the thermal bonding process.
Solution Approach 2:
The invention changes the temperature parameter of the web by introducing cooling air. The web is cooled locally in the run-out region before detachment, which creates bonding and shrinkage. This parameter change (temperature reduction) transforms the web's physical state to prevent adherence while maintaining the overall bonding effectiveness achieved during the thermal processing.
2Ease of operation
If cooling air is applied to prevent web adherence, then web detachment is improved, but the energy balance of the bonding plant is affected
Solution Approach 1:
The invention applies local quality by directing cooling air only to specific regions of the web in the run-out area, rather than cooling the entire web uniformly. The cooling air is applied locally before detachment points, creating bonding and shrinkage only where needed. This localized approach minimizes energy consumption while achieving the desired web detachment.
Solution Approach 2:
The invention segments the cooling action into specific zones within the run-out region. Rather than applying cooling throughout the entire bonding plant, the cooling air is directed to discrete areas where web detachment is needed. This segmentation allows the bonding process to continue effectively in other regions while preventing adherence only where necessary.
3Reliability
If the operating speed is reduced to prevent web damage from adherence, then web integrity is maintained, but productivity decreases
Solution Approach 1:
The invention performs preliminary action by creating bonding and slight shrinkage in the web before it detaches from the through-air drum. This preliminary bonding strengthens the web structure in advance, preventing damage during detachment. As a result, the web maintains its integrity even at higher operating speeds, eliminating the need to reduce speed for web protection.
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 solution effectively prevents web adherence to the through-air drum while maintaining the bonding process efficiency by localized cooling, allowing the use of a larger circumferential area for bonding without significantly affecting the energy balance of the plant, and enabling easy retrofitting of existing systems.
Implementation Method 1
cooling air is directed onto the web ahead of the detachment point of the web from the through-air drum. The invention assumes that a cooling down shortly before the detachment point produces bonding and a slight shrinkage
Implementation Method 2
heated fresh air flows through the web and the through-air drum
Implementation Method 3
By means of an air system, the cooling air of the fresh air and hot air are separated inside the through-air drum
Data Source
AI summary
The invention relates to a device and a method for the bonding of a textile web, whereby the textile web is guided over an idler drum into a bonding plant, led around a through-air drum and over a cooling drum and then led out again, whereby heated fresh air flows through the web and the through-air drum and the exhaust air is extracted from the bonding plant. According to the invention, it is intended that cooling air is directed onto the web ahead of the detachment point of the web from the through-air drum onto the web.