Nozzle Bar Adhesive Application for High-Speed Web Coating
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Solution Overview
Problem
Existing devices for applying adhesive to material webs, such as paper webs for wound cardboard tubes, face issues like adhesive loss, high setup times during web width changes, and limited processing speed due to centrifugal forces on rollers, which hinder efficient coating and cleanliness.
Innovation Solution
A nozzle bar-based adhesive application device with slit-shaped nozzle openings and multiple adhesive feeds allows for precise adhesive application, avoiding centrifugal forces and enabling high web speeds, with easy adaptation to different web widths by exchanging the nozzle bar, ensuring minimal adhesive loss and improved cleanliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If adhesive is applied using rollers, then the entire surface can be coated, but high centrifugal forces act on the adhesive which increase quadratically with roller speed, limiting web speed
Solution Approach 1:
The patent replaces the mechanical roller-based adhesive application system with a pneumatic spray system. Instead of using centrifugal force from rotating rollers to distribute adhesive, the invention uses compressed air to atomize and distribute adhesive through nozzles, eliminating the quadratic relationship between speed and centrifugal force that limited web speed in roller systems.
Solution Approach 2:
The invention employs pneumatic principles by using compressed air to atomize adhesive and deliver it through nozzles. The adhesive is sprayed in a雾状 (mist) form onto the web, allowing for high-speed application without the mechanical constraints of roller systems. This pneumatic approach enables web speeds that were previously unattainable with mechanical rollers.
2Productivity
If adhesive is applied using doctor bars or rollers, then coating can be achieved, but adhesive loss occurs and setup times are high when changing web width
Solution Approach 1:
The patent implements a dynamically adjustable nozzle system where the spray pattern, coverage width, and adhesive flow rate can be quickly modified by changing nozzle positions or selecting different nozzle configurations. This dynamic adjustability allows rapid adaptation to different web widths without the lengthy cleaning and setup procedures required by doctor bars and rollers, significantly reducing changeover time.
Solution Approach 2:
The invention allows for rapid parameter changes in the adhesive application process. By adjusting nozzle positions, spray pressure, and adhesive flow rates, the system can be quickly reconfigured for different web widths and coating requirements. This parameter flexibility eliminates the need for physical reconfiguration or cleaning that plagues traditional roller and doctor bar systems.
3Quantity of substance
If adhesive is applied using rollers, then coating can be achieved, but adhesive loss occurs due to adhesion to the roller surface
Solution Approach 1:
The patent replaces the mechanical roller contact system with a non-contact pneumatic spray system. Adhesive is delivered in a controlled mist or spray pattern that deposits only where needed on the web surface. This eliminates the inherent adhesive loss that occurs with roller systems, where adhesive adheres to the roller surface and must be removed or wasted during operation and changeover.
Solution Approach 2:
The spray system is designed to deliver adhesive self-regulatingly through controlled atomization and spray patterns. The pneumatic system naturally distributes adhesive in a thin, controlled layer without the need for mechanical scraping or removal mechanisms required by roller systems, minimizing waste and improving adhesive utilization efficiency.
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 achieves significant adhesive savings, high processing speeds, and improved cleanliness by applying the exact amount of adhesive needed, with the ability to use different adhesives for edge and central areas, enhancing the coating process efficiency and quality.
Implementation Method 1
the adhesive application device according to the invention is designed as a nozzle bar. Using this strip, the exact amount of adhesive required can always be applied to the material web
Data Source
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AI summary
The invention relates to a device for applying a coating, in particular adhesive, preferably glue, to a material web (10), in particular a paper web preferably for the production of wound cardboard tubes, having an adhesive application device and an adhesive supply (19). In known devices of this type, a loss of adhesive frequently occurs and changeover times are long during a change of the web width. If the adhesive is applied by means of rollers, it is additionally the case that high centrifugal forces act on the adhesive which adheres to the roller, which centrifugal forces increase quadratically with the roller rotational speed. As a result, the web speed of the material web (10) and therefore the processing speed are limited. In order to avoid these disadvantages, the device according to the invention is characterized in that the adhesive application device is a nozzle bar (13).