Decorative Can Body Adhesive for Specular Gloss

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Solution Overview

Problem

Seamless metal can bodies, particularly steel cans, fail to achieve brilliant specular gloss due to surface roughness and the occurrence of blisters caused by gas generation during the curing reaction of thermosetting resin adhesives, leading to appearance defects and reduced gloss.

Innovation Solution

Employing a thermosetting resin adhesive that generates no by-product gas during curing, such as polyurethane or polyester resin-based adhesives with an internally blocked isocyanate curing agent, to prevent blisters and ensure strong adhesion between the metal or vapor-deposited metal layer and the can body, while adding an inorganic pigment like titanium dioxide for enhanced specular gloss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If thermosetting resin adhesive is used to bond metal layer to can body, then adhesion strength is improved, but blisters occur due to gas generation during curing

Engineering Contradiction:

Improveadhesion strengthVSAvoidblisters on surface

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the adhesive system by selecting specific thermosetting resins (polyester resin, polyurethane resin, or phenolic resin) that have different curing characteristics and gas generation profiles, thereby reducing blister formation while maintaining adhesion strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite material systems combining specific resin types with matching curing agents (e.g., polyester resin with carboxylic acid curing agent, polyurethane resin with isocyanate curing agent) to achieve optimal balance between adhesion and minimal gas generation during curing

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If metal foil or vapor-deposited metal layer is laminated to provide specular gloss, then aesthetic appearance is improved, but blisters occur causing gloss loss

Engineering Contradiction:

Improvespecular glossVSAvoidblisters on decorative surface

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the curing parameters and adhesive composition to minimize gas generation, thereby preventing blister formation on the metal layer surface and preserving the specular gloss and aesthetic appearance of the decorative can body

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional adhesive curing is performed, then bonding is achieved, but by-product gas generates blisters reducing quality

Engineering Contradiction:

Improvebonding reliabilityVSAvoidby-product gas

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical composition and curing parameters of the adhesive to minimize or eliminate by-product gas generation during curing, thereby maintaining bonding reliability while preventing blister formation that would reduce product quality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent selects adhesive systems where the curing reaction produces minimal gas or where the gas generation is controlled to occur without causing blister formation, effectively converting a potentially harmful by-product into a manageable aspect of the curing process

Inventive Principle:

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

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 achieves a seamless can with excellent specular gloss and strong adhesion, maintaining the gloss even after retort treatment without peeling, and provides a high-grade decorative finish.

Implementation Method 1

a thermosetting resin adhesive that generates no gas in heat curing is used for the adhesive layer

Methodology Applied

Scientific EffectChemical reaction (curing reaction): Chemical Bonding

Implementation Method 2

adding an inorganic pigment like titanium dioxide for enhanced specular gloss

Methodology Applied

Scientific EffectLight reflection and scattering: Reflection

Implementation Method 3

a metal foil or a vapor-deposited metal layer

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Data Source

PatentUS8900682B2Decorative can body and process for producing the same

Publication Date: 2014.12.02 TOYO SEIKAN KAISHA LTD

AI summary

The present invention is an invention made to provide decoration with excellent brilliant specular gloss on the outer surface of the barrel portion of the can body in a seamless can or the like heavily used as a storage container for food, drink or the like, to increase the commercial product value of the seamless can or the like. The present invention is a decorative can body having excellent specular gloss, having a metal foil or a vapor-deposited metal layer provided on the outer surface of a can barrel via an adhesive layer and having a printed film further laminated, wherein a thermosetting resin adhesive with an internally blocked curing agent that generates no by-product gas in heat curing is used for the adhesive layer.