Thermosensitive Adhesive Label Anti-Blocking Design

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Solution Overview

Problem

Thermosensitive adhesive labels face issues with anti-blocking properties during storage, leading to adhesion problems and residue left on objects after peeling, due to low adhesion strength and incomplete adhesive layer formation.

Innovation Solution

A thermosensitive adhesive label comprising a laminate film with specific surface smoothness, contact angle, and composition, including a thermoplastic resin, tackifier, and solid plasticizer, where the adhesive layer is activated between 70 to 150°C, and a part of the adhesive is absorbed into the second film layer to prevent blocking and ensure strong adhesion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If anti-blocking additives are added to the thermosensitive adhesive agent, then anti-blocking property is improved, but adhesion strength decreases and paste remains on the object after peeling

Engineering Contradiction:

Improveanti-blocking propertyVSAvoidadhesion strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The invention divides the adhesive system into two distinct layers: a thermosensitive adhesive layer containing anti-blocking additives for non-adhesive storage, and a separate heat-activatable adhesive layer that provides strong adhesion when heated. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between anti-blocking property and adhesion strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a heat-activatable adhesive layer as an intermediary between the thermosensitive adhesive layer and the label substrate. This intermediary layer remains inactive during storage (allowing anti-blocking) but activates upon heating to provide strong adhesion, thus mediating between the conflicting requirements of non-adhesive storage and strong bonding.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the thermosensitive adhesive label is stored as a roll, then ease of operation is improved, but blocking occurs during storage in summer

Engineering Contradiction:

Improvestorage convenienceVSAvoidanti-blocking property

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention changes the temperature parameter of the adhesive system by introducing a heat-activatable adhesive layer that remains non-adhesive at room temperature (10-30°C) but becomes adhesive when heated (70-150°C). This parameter change allows the label to be stored as a roll without blocking during cold weather while preventing unwanted adhesion during hot summer storage, thus resolving the contradiction between ease of operation and anti-blocking property.

Inventive Principle:

Principle #35Parameter changes

3Strength

If the adhesive layer is made stronger to improve adhesion, then strength is improved, but peeling becomes difficult and paste remains on the object

Engineering Contradiction:

Improveadhesion strengthVSAvoidpeelability

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The patent makes the adhesive properties dynamic by using a heat-activatable adhesive layer that can switch between non-adhesive and adhesive states based on temperature. During storage and handling, the adhesive remains inactive allowing easy peeling. During labeling, heat activation provides strong adhesion. This dynamic behavior resolves the contradiction between strong adhesion and easy peeling.

Inventive Principle:

Principle #15Dynamics

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 provides excellent anti-blocking properties, stable adhesion, and easy peeling without residue, enhancing label applicability and reducing production costs by integrating adhesive formation with printing.

Implementation Method 1

the thermosensitive adhesive layer is activated by heating between 70 to 150°C

Methodology Applied

Scientific EffectThermosensitive adhesive activation: Phase Change

Implementation Method 2

a part of the adhesive is absorbed into the second film layer to prevent blocking and ensure strong adhesion

Methodology Applied

Scientific EffectAdhesive absorption: Absorption (physical)

Data Source

PatentUS9777193B2Thermosensitive adhesive label and labeled container with the same

Publication Date: 2017.10.03 YUPO CORP

AI summary

A thermosensitive adhesive label comprising a laminate film of a first film layer and a second film layer, and a thermosensitive adhesive layer on the surface of the second film layer side of the laminate, wherein the Bekk smoothness of the surface of the first film layer side of the laminate film is from 2000 to 20000 seconds, the Bekk smoothness of the surface of the second film layer side of the laminate film is from 800 to 20000 seconds, the contact angle with water of the surface of the second film layer side of the laminate film is from 20 to 80°, and the surface strength of the thermosensitive adhesive layer is from 0.6 to 1.8 kg-cm.