Linerless Label Web Positionally Alternating Adhesive Stripes
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Solution Overview
Problem
Conventional linerless labels with pressure-sensitive adhesive coatings face challenges such as adhesive contamination and telescoping issues during manufacturing, which complicate the production of larger machine rolls and subsequent unwinding into narrower customer rolls.
Innovation Solution
A method for manufacturing linerless label webs with positionally alternating adhesive stripes and adhesion-free areas, allowing for self-winding into larger machine rolls without telescoping, by controlling the positional frequency and amplitude of adhesive stripes to prevent adhesive buildup and internal pressure issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If continuous adhesive coating is applied on linerless labels, then adhesion performance is improved, but telescoping occurs during self-winding into machine rolls
Solution Approach 1:
The continuous adhesive coating is segmented into discrete adhesive stripes separated by adhesion-free areas. This segmentation prevents the cumulative adhesive pressure that causes telescoping during self-winding, while still providing sufficient adhesion at the stripe locations. The adhesive stripes are positioned at specific intervals along the label web, creating a pattern that maintains roll structural stability.
Solution Approach 2:
Different regions of the label web are assigned different adhesive properties: adhesive stripes provide strong local adhesion where needed, while adhesion-free areas provide local non-adhesion to prevent roll telescoping. This local differentiation allows the label to adhere to the target surface at critical points while avoiding excessive adhesive buildup during the winding process.
2Strength
If adhesive coating is applied on linerless labels, then label fixation is improved, but adhesive contamination occurs on printer mechanisms
Solution Approach 1:
The adhesive coating is segmented into discrete stripes rather than continuous coverage. This reduces the total amount of adhesive on each label, thereby minimizing adhesive transfer to printer mechanisms while maintaining sufficient fixation strength at the stripe locations. The adhesion-free areas act as barriers that prevent adhesive from spreading to adjacent surfaces.
Solution Approach 2:
Adhesive is extracted from continuous coverage and concentrated only in specific stripe regions. This removal of adhesive from other areas eliminates the source of contamination while preserving the essential adhesion function where the stripes are applied.
3Productivity
If larger machine rolls are produced, then production efficiency is improved, but telescoping complicates unwinding and slitting processes
Solution Approach 1:
The segmented adhesive stripe pattern prevents telescoping even in large machine rolls, allowing them to be produced efficiently. The adhesion-free areas create a stable roll structure that can be unwound and slit without the complications of telescoping, maintaining ease of manufacture throughout the production process.
4Stability of the object's composition
If positionally alternating adhesive stripes are used, then roll structure stability is improved, but manufacturing complexity increases
Solution Approach 1:
The adhesive application follows a periodic pattern of stripes and adhesion-free areas. This periodic structure can be implemented using simple repeating masks or modular coating devices, reducing the actual manufacturing complexity despite the apparent sophistication of the pattern. The regular intervals and consistent stripe dimensions make the system manageable.
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 prevents telescoping, reduces adhesive contamination, and enhances the production efficiency of both machine and customer rolls, ensuring smooth unwinding and slitting processes while maintaining effective adhesion and removability.
Implementation Method 1
The second side can comprise a pressure sensitive adhesive coating
Data Source
AI summary
This invention relates to a method for manufacturing a continuous linerless label web. The continuous linerless label web comprises a positionally alternating adhesive coating on a face. The method comprises: supplying the face with a release coating arranged on a first side, providing positionally alternating continuous adhesive stripes on a second side wherein predetermined properties of the positionally alternating continuous adhesive stripes are selected so that number of stripes in each single customer roll is one or more, width of each stripe is smaller than width of single customer roll, and positional frequency is selected so that one oscillation cycle covers 0.1-10 peripherical lengths in a machine roll, and 1-100 peripherical lengths in a customer roll defined as peripheries of full rolls. This invention further relates to a linerless label web and a linerless customer roll.