Oscillating Dosing Device for Intermittent Web Coating
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Solution Overview
Problem
Existing coating technologies for absorbent substrates are not adapted for discontinuous or intermittent coating at high industrial manufacturing speeds, leading to web breakage and inefficiencies, particularly when coating at speeds up to 1.200 m/min.
Innovation Solution
An apparatus with a support device and dosing and transfer device, equipped with an oscillating mechanism, applies coating material uniformly to a moving web of absorbent substrate at specific locations, allowing for discontinuous or intermittent coating by oscillating between engaged and remote positions, ensuring the coating material is applied only when the web contacts the support device, thereby reducing the risk of web breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous coating apparatus is used at high industrial manufacturing speeds (up to 1.200 m/min), then productivity is improved, but the web breaks due to the mechanical stress and instability of continuous coating at such speeds
Solution Approach 1:
The patent applies periodic action by using an oscillating mechanism that moves the dosing and transfer device between engaged and remote positions. This creates intermittent coating cycles where the coating is applied only during specific engagement periods, reducing continuous mechanical stress on the web while maintaining high overall manufacturing speeds. The periodic engagement and disengagement allows the web to stabilize between coating applications.
2Manufacturing precision
If a dosing and transfer device is continuously coated with coating material, then manufacturing precision is improved, but the complexity of the apparatus increases due to the oscillating mechanism required
Solution Approach 1:
The patent applies dynamics by making the dosing and transfer device oscillate between engaged and remote positions rather than remaining stationary or moving continuously. This dynamic oscillation allows the coating to be applied uniformly only when needed (in engaged position) while reducing the overall complexity compared to a fully continuous coating system. The oscillating mechanism enables precise control of coating application timing and location.
Data Source
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AI summary
An absorbent substrate web coating apparatus (10) for applying a coating material (21) on a web of absorbent substrate (20) over a defined length (L) includes: − a support device (3, 33, 34) arranged to support the web of absorbent substrate (20) running at a speed ranging from around 200 m/min to around 1.200°m/min, − a dosing and transfer device (1, 2) arranged to cooperate with a coating material storing and transferring unit (30, 31, 32) such as to continuously coat a surface (9) of the dosing and transfer device (1) with an uniform quantity of coating material (21), and − an oscillating mechanism (5, 15, 25, 35) arranged to oscillate the dosing and transfer device (1, 2) or the support device (33, 34) from an engaged position (P1) to a remote position (P2), the dosing and transfer device (1, 2) being arranged relatively to the support device (3, 33, 34) such that the transfer device (1, 2) applies the coating material (21) to the web of absorbent substrate (20) at a contacting location where the web of absorbent material (20) contacts the support device (3, 33, 34) and the dosing and transfer device (1, 2) only in the engaged position (P1).