Heat-Activatable Linerless Label Detack Layer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing heat-activatable, linerless pressure-sensitive label constructions face challenges due to high production costs, dust-related hazards in roll-to-roll environments, and poor tack results with high binder proportions, which affect activation speed and adhesion.

Innovation Solution

The use of a detack layer with a dispersed plasticizer and a non-ionic polymeric binder, where the weight ratio of plasticizer to binder is greater than 15:1, allows for quick activation and improved adhesion without the need for a release liner.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a detack layer with high binder proportion is used, then the detack layer provides good coverage and adhesion, but the activation speed decreases and tack results become poor

Engineering Contradiction:

Improveadhesion qualityVSAvoidactivation speed

Core Design Contradiction:

ReliabilityVSSpeed

Solution Approach 1:

The invention changes the plasticizer to binder ratio parameter from traditional low ratios (maximum 12:1) to high ratios (at least 20:1, preferably 30:1 or 40:1). This parameter change reduces binder content from 7.7 wt% or higher to 6.25 wt% or lower, enabling faster activation while maintaining adequate adhesion through the dispersed plasticizer mechanism

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention utilizes the phase transition of solid plasticizer particles upon heating. The solid plasticizer melts and combines with the pressure-sensitive adhesive layer, creating the sticky activated state. This phase transition mechanism enables quick activation without relying on high binder content, resolving the contradiction between adhesion quality and activation speed

Inventive Principle:

Principle #36Phase transitions

2Reliability

If solid plasticizer particles are used in the detack layer, then the detack layer remains non-blocking at room temperature, but dust-related hazards occur in roll-to-roll environments

Engineering Contradiction:

Improvenon-blocking propertyVSAvoiddust hazards

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention converts the potential harm of solid plasticizer particles (dust generation) into a benefit by carefully controlling their dispersion and size. The solid particles remain intact and dispersed rather than being ground into fine dust, eliminating the dust hazard while preserving the non-blocking property and quick activation capability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The invention uses solid plasticizer particles that are consumed during the activation process. The particles melt and integrate with the adhesive layer, providing a single-use, effective solution that eliminates the need for release liners while managing dust concerns through controlled particle characteristics

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Quantity of substance

If traditional detack layers with maximum 12:1 plasticizer to binder ratio are used, then the binder content is at least 7.7 weight percent, but the activation window becomes slow and adhesion performance deteriorates

Engineering Contradiction:

Improvebinder contentVSAvoidactivation time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The invention fundamentally changes the plasticizer to binder ratio parameter from 12:1 maximum to 20:1 minimum (preferably 30:1 or 40:1), which inversely changes the binder content from 7.7 wt% minimum to 6.25 wt% maximum. This parameter reversal enables faster activation by reducing the binder that would otherwise slow down the plasticizer migration and activation process

Inventive Principle:

Principle #35Parameter changes

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 enables the production of heat-activatable labelstocks with a non-blocking detack layer, providing a quick activation window and enhanced adhesive properties, while reducing production costs and minimizing dust-related hazards.

Implementation Method 1

Upon heating, the plasticizer in the dispersion melts and combines with the adhesive layer

Methodology Applied

Scientific EffectMelting: Melting

Implementation Method 2

a heat-activatable layer or overlaminate film which includes polymers that normally do not possess open tack, but are mixed with one or more solid plasticizer are known. When melted, the solid plasticizer causes the nontacky polymer to become tacky

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS20250034432A1Heat-activatable linerless label constructions

Publication Date: 2025.01.30 AVERY DENNISON CORP

AI summary

Heat-activatable, linerless labelstock constructions with a detack layer are disclosed. Methods of preparing the same are disclosed.