Hot-Melt Nozzle Channel Parallel to Roller Surface
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Solution Overview
Problem
Existing devices for applying hot-melt to a web of material face issues such as dirt particles getting stuck between the nozzle and the web, causing unevenness in the film, and fluid accumulation at the nip between the roller and counter object, leading to substantial unevenness when the web is rolled up.
Innovation Solution
A device with a driven roller and a nozzle channel that is parallel to the roller's surface in the flow direction, where the nozzle channel is partly bounded by the roller's surface, ensuring the hot melt exits at the same speed and direction as the roller, and includes partition walls for controlled application, preventing accumulation and ensuring evenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the space between the nozzle and the web of material is made small to achieve a thin and even film, then the film thickness is improved, but dirt particles get stuck between the nozzle and the web causing tracks in the film
Solution Approach 1:
The roller acts as an intermediary between the nozzle and the web of material. The nozzle applies hot-melt to the roller surface, which then transfers the material to the web. This intermediate transfer surface prevents direct contact between the nozzle and web, eliminating the risk of dirt particles causing tracks while maintaining thin film application.
2Device complexity
If a nip between the roller and counter object is used to transfer fluid, then the transfer mechanism is simplified, but fluid accumulation occurs at the nip causing unevenness in the film thickness
Solution Approach 1:
The invention extracts the fluid transfer point from the traditional nip location and relocates it to the roller surface where the nozzle applies material. By taking out the transfer function from the counter-object interface and placing it at the roller surface, the harmful fluid accumulation at the nip is eliminated while maintaining the simplicity of the roller-based transfer mechanism.
3Device complexity
If the nozzle channel is perpendicular to the roller surface for direct application, then the application structure is simplified, but the hot-melt exits at different speed and direction causing uneven layer formation
Solution Approach 1:
The nozzle channel is oriented parallel to the roller surface rather than perpendicular, changing the dimension of material application from radial to tangential. This dimensional change allows the hot-melt to exit in the same direction as the roller surface movement, ensuring even layer formation while maintaining relatively simple nozzle structure.
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 results in a smooth, even layer of hot-melt on the roller and web, eliminating the need for thickness control at the nip and preventing dirt-induced disturbances, ensuring accurate and undisturbed application of hot-melt tracks.
Implementation Method 1
the direction of movement of the roller and the direction of the flow hot melt exiting the nozzle will be the same, contributing to a more even layer of hot melt on the roller
Data Source
AI summary
The invention relates to a device for applying a hot-melt to a web of material. The device includes a driven roller and a nozzle with a nozzle channel arranged adjacent the driven roller for supplying a hot melt through the nozzle channel to the surface of the roller. The invention also relates to a combination of a device according to the invention and a web of material, which web of material is guided along the driven roller and wherein the nozzle channel exits in front of the nip of the web of material and the driven roller.