Wicketed Bag Quick Closure System with Integrated Protective Strip

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Solution Overview

Problem

Existing quick-closing systems for packaging bags are not effective for bags without a flap, as they fail to ensure a tight closure, and the detachment process is complex and cumbersome.

Innovation Solution

A packaging bag design featuring a bundle that extends from one sheet with pre-cuts for detachment, a first adhesive strip on the inner face of the sheet, and a protective strip that temporarily covers the adhesive strip, allowing for simple detachment and permanent bonding of the sheets for closure, regardless of whether the bag has a flap or not.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the bundle is folded back and inserted into the bag opening to position the protective band, then the protective band can be positioned against the adhesive band to prevent premature closing, but the detachment process becomes complex and cumbersome requiring multiple folding and inserting steps

Engineering Contradiction:

Improveprevention of premature closingVSAvoiddetachment process complexity

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The protective band is extracted from the complex folding/inserting sequence and integrated directly into the bundle structure. The bundle itself serves as the protective carrier, eliminating the need for separate protective band manipulation steps.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The protective function and bundle structure are merged into a single integrated component. The bundle incorporates both the detachment function and the protective function for the adhesive strip, reducing the number of separate operations required.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If the bundle is folded back and inserted into the bag, then the protective strip can be positioned correctly, but the bundle length increases and the design becomes more complex

Engineering Contradiction:

Improveprotective strip positioningVSAvoidbundle structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective strip positioning function is extracted from the bundle folding process and achieved through the natural extension of the bundle in line with the first sheet, eliminating unnecessary structural complexity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of folding the bundle back to achieve protective strip positioning, the solution inverts the approach by having the bundle extend forward in line with the sheet, with the protective strip naturally positioned along the bundle's length.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If existing quick-closing systems are used on bags without flaps, then the closure mechanism can be applied, but the system fails to ensure a tight closure seal

Engineering Contradiction:

Improveapplicability to different bag typesVSAvoidclosure seal tightness

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The closure system is designed to be universal, working effectively on both bags with flaps and bags without flaps. The adhesive strip system provides reliable sealing regardless of the bag's flap configuration, achieving tight closure in both scenarios.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The adhesive strip is positioned and configured with specific local properties to ensure effective sealing. The strip's placement, adhesive characteristics, and interaction with the bundle create a reliable seal at the critical closure location, regardless of overall bag design variations.

Inventive Principle:

Principle #3Local quality

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 ensures total closure of the bag opening between the two sheets and simplifies the detachment process by maintaining the bundle in direct extension of the first sheet, reducing the length of the bundle and simplifying the design, while allowing for easy attachment and detachment without folding the bundle.

Implementation Method 1

a first adhesive strip (11) arranged on an inner face of the first sheet (2)

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

a protective strip (16) that temporarily covers the first adhesive strip (11)

Methodology Applied

Scientific EffectPhysical barrier protection:

Implementation Method 3

with pre-cuts between these edges to allow the bundle to be detached by applying two opposing pulls on the bundle and the bag

Methodology Applied

Scientific EffectMechanical fracture: Fracture Mechanics

Data Source

PatentEP3619127B1Wicketed bag comprising a quick closure system and stack of bags

Publication Date: 2021.03.31 HANOVA

Figure 1~3
Figure 4~6

AI summary

The invention relates to a wicketed packaging bag (1) comprising a first sheet (2) and a second sheet (3) assembled to one another to form a container (7) having a top opening (8). A lip (9) extends from the first sheet (2) and the lower edge (9a) of the lip is attached to the upper edge (2a) of the first sheet, with perforations (10) being provided between said edges. A first adhesive strip (11) is provided on an inner surface (12) of the first sheet, a second adhesive strip (14) is provided on an inner surface (15) of the lip, and a protective strip (16) covers the two adhesive strips. The protective strip comprises means for removably gluing the protective strip to the first adhesive strip (11) and for permanently gluing same to the second adhesive strip (14). The invention also relates to a bundle (100) of bags (1).