Packaging Bag Gusset Chute for Reclosure and Dosing
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Solution Overview
Problem
Existing film packaging bags for bulk goods, such as pet food and powdery materials, face challenges in easy handling and precise dosing, especially when only partial quantities are removed, and are often complex and expensive to produce, with re-closing devices affecting machinability and handling.
Innovation Solution
A film packaging bag design featuring tearable weakening lines on the front and rear walls with expansion folds that form a chute for easy removal and re-closure, allowing for a large removal opening and improved handling, and using composite films with heat-sealable layers for stability and barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reclosure device with profile strips is provided on the side gusset, then the packaging bag can be re-closed after opening, but the production becomes complex and expensive, and machinability is negatively affected
Solution Approach 1:
The patent removes the complex profile strip reclosure device from the packaging bag structure. Instead, it uses a simple transverse sealing seam that can be easily produced during manufacturing, eliminating the problematic internal reclosure mechanism while maintaining the ability to seal the bag after opening
Solution Approach 2:
Instead of providing a complex reclosure device that locks when the gusset is unfolded, the patent inverts the approach by creating a simple sealing seam that naturally seals when the gusset is folded back, using the bag's own structure rather than an added mechanism
2Reliability
If a reclosure device with profile strips is provided on the side gusset, then the packaging bag can be re-closed after opening, but the handling of narrow gussets is difficult due to the relatively small removal opening
Solution Approach 1:
The patent removes the profile strip reclosure device that was interfering with handling. The simple transverse sealing seam approach eliminates the mechanical complexity that made narrow gusset handling difficult, allowing the gusset to be manipulated freely
Solution Approach 2:
Instead of using a reclosure device that requires manipulation of profile strips, the patent uses a sealing seam that automatically seals when the gusset is folded back, inverting the mechanism from active locking to passive sealing, thereby improving handling ease
3Reliability
If the removal opening is made small to allow re-closure, then the packaging bag can be sealed after opening, but the removal of contents through the opening becomes difficult
Solution Approach 1:
The patent makes the removal opening dynamic by using a foldable side gusset that can be unfolded to create a large opening for easy content removal, then folded back to seal the opening. This dynamic structure allows the opening size to change based on the operational phase, resolving the contradiction between large opening for removal and small opening for sealing
4Reliability
If prefabricated film packaging bags are produced with internal reclosure devices, then re-closure is possible, but the filling device must be adapted due to the material thickness affecting machinability
Solution Approach 1:
The patent removes the internal profile strip reclosure devices from the prefabricated bag design. The simple transverse sealing seam approach eliminates the material thickness issues that required filling device adaptations, allowing standard filling equipment to be used without modification
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 design enables easy handling and precise dosing of bulk goods, maintains protection against environmental influences, and is cost-effective to produce, ensuring good machinability and stability of the packaging bag.
Implementation Method 1
composite films with heat-sealable layers for stability and barrier properties
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
The invention relates to a sheet-material packaging bag (1) having a front wall (2), a rear wall (3), a head portion (5), closed by a transfer seam (4), and a tear-open removal region (6), which extends along one side of the sheet-material packaging bag (1) from a first longitudinal side (7a) to the head portion (5). According to the invention, the removal region (6) of the front and rear walls (2, 3) has a respective tear-open weakening line (8) arranged in it, wherein sheet-material inserts (9, 9') are provided on the inside of the bag, these inserts being fastened on the inside of the bag on either side of one of the weakening lines (8) and having an expansion crease (10) in the region of the associated weakening line (8), wherein that portion of the removal region (6) which is bounded by the weakening line (8) can be swung out in order to form a spout (11), and wherein, in the swung-out state, the slots (12) formed along the weakening lines (8) in each case in the front wall (2) and the rear wall (3) are then covered over by the expansion crease (10). The invention also relates to a method of producing the sheet-material packaging bag (1).