Can Shoulder Rolling Decoration Without Buckling Deformation

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Solution Overview

Problem

Existing methods for decorating the shoulder of thin-walled cans often result in abnormal deformation due to the use of molds that press uneven patterns, leading to damage and buckling issues during the manufacturing process.

Innovation Solution

A method and apparatus involving inner and outer rolls with concave and convex portions that clamp and rotate the shoulder of the can, allowing for the formation of three-dimensionally shaped portions without causing abnormal deformation, by supporting the shoulder from the inside and pressing it from the outside, maintaining a suitable diameter ratio and wall thickness for stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a mold is pressed onto the shoulder of a thin-walled can to form uneven patterns, then decoration is achieved, but the shoulder buckles and deforms abnormally

Engineering Contradiction:

Improvedecoration pattern on shoulderVSAvoidshoulder deformation

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

Instead of pressing a mold from the outside only, the invention uses an inner roll with a receiver that receives the shoulder from inside the can, combined with an outer roll that presses from outside. This inverted approach of supporting from inside prevents buckling while forming the decoration pattern on the shoulder of thin-walled cans

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The receiver of the inner roll acts as an intermediary support structure between the inner and outer rolls. It receives and supports the shoulder from inside, allowing the outer roll to press the decoration pattern without causing abnormal deformation or buckling of the thin-walled shoulder

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of substance

If the wall thickness of the can is reduced for resource saving, then material efficiency is improved, but the shoulder becomes vulnerable to damage during processing

Engineering Contradiction:

Improvematerial usageVSAvoidshoulder strength

Core Design Contradiction:

Loss of substanceVSStrength

Solution Approach 1:

The receiver of the inner roll serves as a protective intermediary that supports the thin-walled shoulder from inside during the decoration process. This support mechanism enables the use of reduced wall thickness for resource saving while preventing damage and maintaining shoulder integrity during processing

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If a groove forming tool is pressed only from outward of the shoulder, then the process is simple, but the thin-walled can shoulder causes abnormal deformation

Engineering Contradiction:

Improveprocessing simplicityVSAvoidshoulder deformation

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention inverts the conventional approach by introducing an inner roll with a receiver that supports the shoulder from inside the can. This modification to the groove forming process maintains relative simplicity while preventing abnormal deformation of thin-walled shoulders that occurs with outside-only pressing

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The receiver acts as an intermediary support structure that enables the groove forming tool to press from outside without causing deformation. It provides internal support that allows the external pressing force to be applied safely to thin-walled cans

Inventive Principle:

Principle #24Intermediary (Mediator)

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 effectively prevents abnormal deformation and damage to the can's shoulder during processing, ensuring a stable and aesthetically appealing product with sufficient strength and processability, even with thin wall thicknesses.

Implementation Method 1

an inner roll having a receiver, which has at least one of a concave portion and a convex portion, for receiving the shoulder from inside

Methodology Applied

Scientific EffectMechanical support from internal receiver:

Implementation Method 2

an outer roll, which has at least one of a concave portion and a convex portion corresponding to the receiver of the inner roll, for pressing the shoulder from outside, wherein the inner roll and the outer roll are rotated relative to the can

Methodology Applied

Scientific EffectMechanical deformation through rolling contact:

Data Source

PatentUS11103914B2Can manufacturing method, can manufacturing device, can, and can manufacturing tool set

Publication Date: 2021.08.31 TOYO SEIKAN KAISHA LTD

AI summary

A can 1 is provided with a mouth part (4), a shoulder part (3), and a body part (2). The shoulder part (3) of the can (1) is decorated, without damaging the shoulder part (3), by forming at least one of a recess and a protrusion by a rotating process in which the shoulder part (3) is held between a receiver (11a), having a concave-convex shape, of an inner roll (11) and an outer roll (12) having a convex-concave shape corresponding to the concave-convex shape of the receiver (11a) of the inner roll (11).