Packaging Machine Lower Flap Folding via Negative Pressure

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Solution Overview

Problem

Existing machines for packaging groups of products in rolls face challenges in achieving high-quality packages due to issues like 'false-folds' and irregular folding angles, particularly with the lower horizontal flap, which affects the final appearance and quality of the packaging.

Innovation Solution

The machine incorporates a device for generating negative fluid pressure to assist in folding the lower horizontal flap, creating a pre-fold that helps in avoiding false-folds and ensuring a smoother interaction with the fixed folding device, thus maintaining the quality of the package.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If mechanical folding devices are used to fold the lower horizontal flap, then the folding operation can be performed, but false-folds are generated and the final appearance quality deteriorates

Engineering Contradiction:

Improvefolding operationVSAvoidfolding quality

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent replaces the purely mechanical folding system with a pneumatic system. A jet of air is directed at the lower horizontal flap to lift it before folding, substituting mechanical contact with pneumatic action. This eliminates the impact between the moving flap and the fixed folder that causes false-folds, while still achieving the folding operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent applies preliminary action by lifting the lower horizontal flap with a jet of air before the folding operation occurs. This pre-lifting action prepares the flap for folding by reducing its speed and creating a smoother interaction with the folding device, preventing false-folds from occurring during the actual folding process.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If the lower horizontal flap moves at high speed during folding, then production efficiency is maintained, but false-folds are triggered due to impact with the fixed folder

Engineering Contradiction:

Improveproduction speedVSAvoidfolding accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent substitutes mechanical deceleration with pneumatic deceleration. Instead of relying on the fixed folder to stop the moving flap (which causes impact and false-folds), a jet of air is used to gradually reduce the flap's speed before folding, maintaining smooth operation at high production speeds without compromising folding accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces air as an intermediary between the moving lower horizontal flap and the fixed folding device. This intermediary medium allows the flap to be decelerated and folded without direct high-speed impact, mediating the interaction to prevent false-folds while maintaining production efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If electrostatic charges accumulate on the packaging material, then material handling is facilitated, but false-folds are generated due to friction and static interference

Engineering Contradiction:

Improvematerial handlingVSAvoidfolding regularity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical contact-based folding with pneumatic folding. By using a jet of air to lift and fold the flap instead of mechanical contact, the system minimizes friction that generates electrostatic charges, thereby maintaining ease of material handling while eliminating false-folds caused by static interference.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 use of negative fluid pressure to pre-fold the lower horizontal flap enhances the folding process, reducing the occurrence of false-folds and improving the final shape and quality of the package without altering the machine's structure or production speeds.

Implementation Method 1

a device for generating a negative fluid pressure, positioned before the folding device relative to the feed direction, and configured to obtain, by generating a negative pressure, a lifting, at least partly, of the lower horizontal flap

Methodology Applied

Scientific EffectNegative fluid pressure: Pressure Gradient

Data Source

PatentUS12312110B2Machine for packaging groups of products in a roll

Publication Date: 2025.05.27 TMC SPA

AI summary

A machine for packaging groups of products in a roll with a sheet of film includes a first station wrapping the sheet on four consecutive sides of the group of products. For each of the two heads of the group, upper and lower horizontal flaps and first and second vertical flaps protrude. A second station for folding the four flaps has a conveyor surface for moving the group along a feed direction. A Folding devices, positioned on opposite sides of the conveyor fold the corresponding pairs of the flaps towards the head of the group. A device for generating a negative fluid pressure for each side of the conveyor surface, located before the device for folding each lower horizontal flap, relative to the feed direction, is configured to obtain, by generating a localised vacuum, a raising of the lower horizontal flap with respect to the conveyor surface.