Folding Unit for Pourable Food Packaging with Reversible Tab Orientation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing folding units for packaging machines limit the size of reclosable opening devices on pourable food packages due to the natural folding direction of end tabs, which reduces space on the top end walls and complicates the application of larger opening devices required for products with different physical characteristics.

Innovation Solution

A high-speed folding unit that reversibly adjusts the folding direction of end tabs onto the same side as the longitudinal sealing strip, ensuring precise and repeatable folding by using a chain conveyor and movable impact surfaces to fold the tabs in the traveling direction, allowing for larger opening devices to be applied.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If end tabs are folded in the natural direction (opposite to conveyor travel), then folding is simple and reliable, but space for opening devices on top end walls is reduced

Engineering Contradiction:

Improvefolding simplicityVSAvoidspace for opening devices

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent applies inversion by reversing the natural folding direction of end tabs. Instead of folding opposite to conveyor travel (natural direction), the end tabs are folded in the traveling direction of the conveyor by using a movable impact surface that changes orientation during pack transport, thereby inverting the conventional folding approach to gain space for opening devices

Inventive Principle:

Principle #13The other way round (Inversion)

2Area of stationary object

If end tabs are folded onto the same side as longitudinal sealing strip, then space for opening devices is increased, but folding precision and repeatability become difficult to ensure

Engineering Contradiction:

Improvespace for opening devicesVSAvoidfolding precision

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The patent applies dynamics by using a movable impact surface that changes its orientation dynamically during the pack's travel along the conveyor. The impact surface transitions from a first orientation (receiving the end tab) to a second orientation (folded position), enabling precise and repeatable folding in the traveling direction while maintaining control over the folding process

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies preliminary action by positioning the movable impact surface in a first orientation before the pack arrives, ready to receive and guide the end tab into the correct folding path. This pre-positioning ensures that the folding action begins with proper alignment, contributing to precision and repeatability

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7793484B2Folding unit for pourable food product packaging machines

Publication Date: 2010.09.14 TETRA LAVAL HOLDINGS & FINANCE SA

AI summary

A folding unit for producing packages of pourable food products from sealed packs having at least one projecting foldable end tab. At least one conveying member cyclically receives a relative pack, by the end corresponding to the tab, and feeds the pack along a forming path crosswise in the axis of the pack. A folding mechanism having an impact surface receives each pack by the end corresponding to the tab, and is carried by the conveying member to move between a first operating position, in which the impact surface forms, with the feed direction of the relative pack, an angle of over 90° and open in the direction of the forming path, to fold the relative tab, upon impact, onto the pack in the traveling direction of the pack, and a second operating position, in which the impact surface is rotated towards and cooperates with the pack.