Label Adhesive Curing via UV Photopolymerisation

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Solution Overview

Problem

Existing methods for curing adhesives on labels, such as coating application or printing, often fail to completely cure the adhesive, leading to difficulties in separating labels from release paper, especially when using a label dispenser.

Innovation Solution

A manufacturing method that applies an acrylic-base bonding adhesive and cures it using active energy rays, such as ultraviolet light, to form a cured layer on the adhesive layer, ensuring secure separation and preventing adhesive exudation from cut surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If coating application or printing is used to cure adhesive, then the adhesive can be cured to some extent, but the curing is incomplete and labels cannot be securely separated from release paper

Engineering Contradiction:

Improveadhesive curing completenessVSAvoidlabel separation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces conventional coating application or printing methods with UV irradiation to cure the adhesive. This substitution of curing mechanism enables complete curing of the adhesive, ensuring labels can be securely separated from release paper when using a label dispenser.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the curing parameter from conventional thermal or chemical curing to UV light curing. By using UV irradiation, the adhesive achieves complete curing, which resolves the issue of incomplete curing and enables proper label separation.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If conventional adhesive curing methods are used, then the process is simple, but adhesive exudation occurs from cut surfaces

Engineering Contradiction:

Improvecuring process simplicityVSAvoidadhesive exudation

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The patent replaces conventional curing methods with UV irradiation, which cures the adhesive completely and prevents adhesive exudation from cut surfaces while maintaining process simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes the phase transition of the adhesive from uncured to cured state through UV irradiation. This complete phase transition prevents adhesive exudation from occurring at cut surfaces.

Inventive Principle:

Principle #36Phase transitions

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 method enhances the secure curing of adhesives, allowing for easy separation of labels from release paper and preventing adhesive exudation, enabling reliable automatic labeling of tires.

Implementation Method 1

a cured layer is formed by curing an acrylic-base bonding adhesive

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentEP2631894B1Manufacturing method for a label

Publication Date: 2021.11.24 SATO HLDG CORP

Figure 1(A)~1(B)
Figure 2(A)~2(B)
Figure 3(A)~3(B)

AI summary

Provided is a label and a manufacturing method of the label capable of securely curing an adhesive. The label includes a substrate sheet 11, an adhesive layer 12 formed on the substrate sheet 11, and a cured layer 13 formed on part of the adhesive layer 12, in which the cured layer 13 is formed by curing an acrylic-base bonding adhesive. The manufacturing method of the label includes an adhesive applying step of applying the adhesive on the substrate sheet 11 so as to form the adhesive layer 12, a bonding adhesive applying step of applying the bonding adhesive on the adhesive layer 12, and a cured layer forming step of irradiating the adhesive layer 12 and the bonding adhesive with an active energy ray to cure the adhesive layer 12 and the bonding adhesive.