Linerless Label Intermediate Layer Dusting Control
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Solution Overview
Problem
Conventional linerless labels with direct thermal face materials cause issues in prolonged use, especially in simple and low-cost on-demand printers, due to exposed pressure sensitive adhesive leading to contamination, printer jamming, and reduced service life.
Innovation Solution
A method for manufacturing a direct thermal linerless label web with a face comprising a base layer, a direct thermal printable coating, and an intermediate layer, where the intermediate layer has a specific grammage and mineral pigment content, and a water-based acrylic adhesive coating is applied and thermally dried to form a pressure sensitive adhesive coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pressure sensitive adhesive is exposed without protective release liner in linerless labels, then the label can be applied directly to surfaces, but adhesive contamination occurs on printer mechanisms causing jamming and reduced service life
Solution Approach 1:
The adhesive coating is applied in a patterned manner with varying coverage percentages (10-90%) to create zones of different adhesive properties. This local variation in adhesive quality allows the label to maintain direct application capability while reducing overall adhesive exposure that causes contamination
Solution Approach 2:
The adhesive coating parameters are changed by controlling the coverage percentage and distribution pattern. By adjusting these parameters, the adhesive properties are optimized to balance direct application ease with reduced contamination potential, extending printer service life
2Strength
If mineral pigment content in intermediate layer is high, then the intermediate layer provides structural support, but dusting increases causing contamination in printers
Solution Approach 1:
The mineral pigment content in the intermediate layer is precisely controlled within specific ranges. This parameter optimization maintains sufficient structural support while minimizing dust generation that would contaminate printer mechanisms
Solution Approach 2:
The intermediate layer is formulated as a composite material with specific combinations of binders and mineral pigments. This composite structure provides the necessary mechanical strength while the controlled composition reduces dusting compared to traditional high-mineral formulations
3Strength
If intermediate layer grammage is increased, then the intermediate layer improves adhesive bonding, but the overall label weight and material consumption increase
Solution Approach 1:
The intermediate layer grammage is optimized within a specific range to achieve the minimum thickness required for adequate adhesive bonding. This parameter control ensures sufficient bonding strength while minimizing unnecessary weight and material consumption
Solution Approach 2:
Instead of applying a thick uniform intermediate layer, the solution uses a thinner layer with controlled mineral pigment content that provides just enough bonding support. This partial action approach avoids excessive material usage while maintaining functional performance
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 significantly reduces dusting and adhesive contamination in on-demand printers, leading to longer trouble-free printing and extended service life of the printer.
Implementation Method 1
thermally drying the adhesive coating into a pressure sensitive adhesive coating
Data Source
AI summary
This invention relates to a method for manufacturing a direct thermal linerless label web (100), the direct thermal linerless label web (100) comprising a face (110) having a multilayer structure comprising at least three layers, the face comprising a base layer (113), a direct thermal printable coating (115), and an intermediate layer (114) disposed between the base layer and the direct thermal printable coating, wherein the intermediate layer has a grammage in a range between 0.9 g/m2 and 7 g/m2, total amount of mineral pigments in the intermediate layer is equal to or less than 4 g/m2, and a mineral pigment content of the intermediate layer is less than 85 wt. %, preferably equal to or less than 75 wt. %, calculated from total dry weight of the intermediate layer, wherein the method comprises: supplying the face (110), applying a water-based acrylic adhesive coating (121), and the thermally drying the adhesive coating (121) into a pressure sensitive adhesive coating (120), wherein the water-based acrylic adhesive coating (121) is applied onto the face, or the water-based acrylic adhesive coating (121) is applied on to a carrier material, and the method further comprises: transferring the pressure sensitive adhesive coating from the carrier material on to the face. This invention further relates to a direct thermal linerless label web (100), and a use of a direct thermal linerless label (100) in on-demand printing.