Label Adhesive Channel Layout for Lower Hot Melt Coat Weight
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Solution Overview
Problem
Flood coating hot melt adhesive on the backsides of labels is costly and prone to adhesive leakage in warm environments due to its high viscosity, requiring excessive adhesive and leading to manufacturing inefficiencies.
Innovation Solution
A system that varies hot melt adhesive coat weights on the backside of labels by using channels with different adhesive coat weights, reducing adhesive usage and preventing edge melting through strategically placed adhesive-free and reduced-coat-weight channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot melt adhesive is flood coated on the backsides of labels, then high tack is achieved, but adhesive consumption increases and manufacturing costs increase
Solution Approach 1:
The adhesive application area is segmented into multiple channels with different adhesive coat weights. Instead of uniform flood coating, the label backside is divided into first channels (no adhesive), second channels (first coat weight), and third channels (second coat weight), allowing selective adhesive placement where needed for bonding while reducing overall consumption.
Solution Approach 2:
Different regions of the label backside are assigned different adhesive qualities. High-tack areas receive higher coat weights in third channels, while areas requiring less adhesive or no adhesive receive reduced or zero coating in first and second channels. This local differentiation maintains necessary bonding strength while reducing total adhesive usage.
2Strength
If hot melt adhesive is flood coated on the backsides of labels, then high tack is achieved, but adhesive leakage occurs in warm environments
Solution Approach 1:
By segmenting the adhesive application into controlled channels rather than continuous flood coating, the adhesive is contained within defined boundaries. This segmentation prevents uncontrolled flow and leakage in warm environments while maintaining adequate adhesive presence for bonding.
Solution Approach 2:
Adhesive is applied with appropriate local quality - higher coat weights in areas requiring strong bonding and lower or zero coat weights in areas prone to leakage. This selective application prevents adhesive from migrating to edges where it would cause leakage problems.
3Quantity of substance
If varying adhesive coat weights are applied to channels on the backside of labels, then adhesive consumption is reduced, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process controls adhesive application by varying the coat weight parameter across different channels. By adjusting this single parameter (adhesive thickness/weight) across different label regions rather than changing the entire application mechanism, the system reduces adhesive usage while maintaining manageable manufacturing complexity.
Data Source
AI summary
A label with varying degrees of adhesive coat weights is provided. A backside of the label includes first channel areas in which there is no adhesive. The backside of the label also includes second channel areas in which the adhesive is flood coated. Furthermore, the backside of the label includes third channels in which the adhesive is disposed in a coat weight that is less than what is achieved via flood coating.