Contactless Coating Roll for Label Web Adhesive Precision
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing of label products faces challenges in accurately coating different types of web materials with varying processing speeds and adhesive patterning requirements, necessitating a more flexible and efficient method for producing labels suitable for diverse end uses.
Innovation Solution
A method involving a contactless coating process using a coating unit and roll, where a metered coating is applied to a coating roll and then transferred to a substrate in a nip, allowing for continuous or non-continuous coating layers, including adhesive stripes, to improve evenness and adaptability for different label materials and speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional coating methods are used to coat adhesive onto web materials, then coating can be applied to the substrate, but coating accuracy and evenness deteriorate when processing speeds vary and different web materials are used
Solution Approach 1:
A coating roll is introduced as an intermediary element between the coating applicator and the substrate. The coating is first applied to the coating roll in a controlled manner, then transferred to the substrate through a nip roller. This intermediary approach decouples the coating application process from substrate variations, enabling consistent coating accuracy across different web materials and processing speeds.
Solution Approach 2:
The coating process is segmented into two distinct stages: (1) coating application onto the coating roll, and (2) transfer from the coating roll to the substrate. This segmentation allows each stage to be optimized independently - the first stage ensures precise coating metering, while the second stage ensures reliable transfer regardless of substrate properties or line speed variations.
2Productivity
If coating is applied directly onto moving substrate at high speeds, then productivity increases, but coating evenness and precision deteriorate
Solution Approach 1:
The coating is preliminarily applied to the coating roll under controlled, low-speed conditions where precise metering can be maintained. This preliminary coating action ensures uniform adhesive distribution on the roll surface before the high-speed transfer to the substrate occurs, thereby maintaining coating evenness during high-productivity operation.
Solution Approach 2:
The coating roll serves as a mediator that buffers the high-speed substrate movement. By applying coating to the rotating roll at controlled speeds and then transferring to the fast-moving substrate, the system achieves both high productivity and coating precision.
3Reliability
If adhesive coating is applied continuously across the entire substrate width, then adhesion coverage is maximized, but adhesive buildup and waste increase
Solution Approach 1:
The coating roll enables selective application of adhesive to specific zones on the substrate. By controlling the coating application location on the roll and the nip roller positioning, adhesive can be precisely placed only where needed (e.g., label boundaries), providing sufficient adhesion reliability while minimizing waste and buildup in non-label areas.
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 approach enhances the production efficiency and flexibility of label manufacturing, ensuring reliable adhesion, easy repositionability, and removability, while reducing adhesive buildup and environmental impact, with improved controllability and sustainability.
Implementation Method 1
an applicator, which feeds a coating in a contactless manner onto a surface of the coating roll
Implementation Method 2
The coating can be metered before it is applied onto the coating roll. This kind of coating method using contactless coating method wherein a pre-metered coating is applied on to the coating roll may improve evenness of the coating layer
Implementation Method 3
transferring the coating from the coating roll onto a substrate in a nip thereby forming a coating layer onto the substrate
Implementation Method 4
The first side of the face may have a printable surface. In an embodiment, the first side of the face comprises a direct thermal printable coating. In an embodiment, the first side of the face comprises a release coating
Data Source
AI summary
The invention relates to a method for providing a coating lay for a label web (100), the method comprising arranging a substrate, applying a metered coating (121) in a contactless manner onto a surface of a coating roll (510), and transferring the coating (121) from the coating roll (510) onto the substrate (140) in a nip (515) thereby forming a coating layer onto the substrate, wherein, in the nip (515), the surface of the coating roll (510) is running in an opposite direction to a movement of the substrate (140), thereby obtaining the coating layer for a label web. The invention further relates to a system for providing a coating lay for a label web (100). The invention further relates to method for manufacturing a label web.