Creasing Device Pre-creasing Corrugated Cardboard

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Solution Overview

Problem

Small-size creasing devices struggle with working corrugated cardboard, as they cause material 'explosion' due to localized and violent pressure, especially during longitudinal creasing operations, which is not effectively managed by small creasing discs, leading to material breakage.

Innovation Solution

A creasing device with pre-creasing means that progressively deforms the material using a lead-in surface inclined towards a larger diameter creasing disc, simulating the effect of a larger creasing tool, preventing material explosion by distributing pressure more evenly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Weight of stationary object

If small creasing discs are used in small-size machines, then cost, weight and bulk are reduced, but material explosion and breakage occur due to localized violent pressure

Engineering Contradiction:

Improveweight of creasing deviceVSAvoidmaterial integrity

Core Design Contradiction:

Weight of stationary objectVSReliability

Solution Approach 1:

The patent applies preliminary action by introducing a pre-creasing member that performs preliminary deformation on the corrugated cardboard before the main creasing disc acts on it. This pre-creasing operation gradually deforms the material, reducing internal stresses and preventing sudden explosion during the main creasing operation. The pre-creasing member is positioned upstream of the first creasing member in the work direction, preparing the material in advance for the subsequent creasing action.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the creasing operation into two distinct stages: pre-creasing and main creasing. The pre-creasing member handles the initial deformation in a controlled manner, while the first creasing member completes the creasing operation. This segmentation allows the system to achieve the creasing effect of a large disc without actually using a large disc, thereby maintaining low weight and cost while preventing material explosion.

Inventive Principle:

Principle #1Segmentation

2Area of stationary object

If small creasing discs are used, then device size and cost are reduced, but pressure distribution becomes too localized causing material explosion

Engineering Contradiction:

Improvecreasing disc diameterVSAvoidpressure distribution

Core Design Contradiction:

Area of stationary objectVSStress or pressure

Solution Approach 1:

The pre-creasing member performs preliminary deformation that gradually distributes stress across the material before the main creasing action. This preliminary action ensures that when the first creasing member applies pressure, the material is already partially deformed and more resistant to localized explosion, achieving better pressure distribution despite using a small disc.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If small creasing discs are used, then productivity and flexibility are improved for different formats, but material explosion occurs during longitudinal creasing

Engineering Contradiction:

Improveflexibility in working different formatsVSAvoidmaterial explosion

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The pre-creasing member is configured to define a lead-in surface inclined toward the first creasing member, which progressively deforms the material before it reaches the main creasing disc. This preliminary action is particularly effective during longitudinal creasing operations on corrugated cardboard, preventing material explosion while maintaining the flexibility and adaptability of small-size machines for different formats.

Inventive Principle:

Principle #10Preliminary action

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 effectively prevents material explosion during creasing operations, particularly in longitudinal creasing, and maintains material integrity, achieving results comparable to larger industrial machines without their bulk and cost.

Implementation Method 1

pre-creasing means disposed upstream of the first creasing member in the work direction, and configured to perform a pre-creasing operation that progressively deforms the material of the sheet to be worked before it is subjected to creasing proper

Methodology Applied

Scientific EffectPressure distribution: Pressure Increase

Implementation Method 2

the lead-in surface is shaped with a profile with a desired geometry, which simulates and on the whole reproduces a segment of a creasing tool of bigger sizes than those of the first creasing member

Methodology Applied

Scientific EffectProgressive deformation: Deformation

Data Source

PatentUS10625483B2Creasing device and corresponding method

Publication Date: 2020.04.21 PANOTEC SRL

AI summary

A creasing device for a work unit of a machine for at least creasing and possibly cutting a sheet made of a relatively rigid material, such as corrugated cardboard for packaging, fed in a predetermined work direction, includes a first creasing member mounted rotatable with its first axis of rotation transverse to the work direction, and a pre-creasing system disposed upstream of the first creasing member in the work direction, and configured to carry out a pre-creasing which progressively deforms the material of the sheet to be worked before it is subjected to a creasing operation.