Paper Bag Bottom Sealing via Continuous Glue Bead
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Solution Overview
Problem
Conventional paper bags for fine-grained bulk materials suffer from dust leakage due to non-glued regions along fold lines and edges, leading to channeling and increased material exit, as the use of glue in these areas causes machine soiling and incomplete sealing.
Innovation Solution
A continuous bead of activatable gluing or bonding agent is applied from one side fold line to the opposite, ensuring a complete adhesive bond upon folding, preventing channeling and allowing for dust-tight closure without soiling production machines, using a combination of starch glue and an additional bonding agent like wet gum or cold sealing composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glue is applied in the region of fold lines and edge regions, then sealing completeness is improved, but machine soiling occurs and continuous production is disrupted
Solution Approach 1:
A crease is produced in the region of the fold lines before glue application. This preliminary mechanical action creates a groove or channel that guides the glue into the fold line region, ensuring complete sealing without requiring manual intervention or causing machine soiling. The crease preparation enables subsequent automated glue application to reach areas that would otherwise be inaccessible.
Solution Approach 2:
The patent introduces a crease as an intermediary structural feature that mediates between the glue application system and the fold line region. The crease acts as a guide channel that directs the glue flow into the fold line area, allowing complete sealing while maintaining machine cleanliness and continuous production capability.
2Reliability
If a continuous bead of glue is applied from side fold line to opposite side fold line, then dust-tightness is improved, but machine soiling and production disruption occur
Solution Approach 1:
The crease is formed in advance before glue application, creating a pre-defined path that guides the continuous glue bead into the fold line region. This preliminary structural preparation allows the glue application to proceed continuously without interruption, as the crease automatically channels the glue where needed without requiring manual adjustment or machine stopping.
Solution Approach 2:
The crease serves as an intermediary guide structure that enables continuous glue application. By providing a physical channel or groove, the crease allows the glue to flow continuously along the fold line region without causing machine soiling, thus maintaining productivity while achieving dust-tight sealing.
3Reliability
If starch glue is applied near edge regions, then sealing is improved, but soiling and gluing together of machine parts occurs
Solution Approach 1:
The crease acts as an intermediary guide that directs the starch glue into the fold line region away from the edge regions. The crease creates a controlled path that confines the glue to specific areas, preventing it from reaching machine parts that would cause soiling, while still achieving effective sealing in the fold line regions.
Solution Approach 2:
The patent creates different local conditions: the crease region is prepared to receive and channel the glue, while the edge regions are left without creases or with different crease configurations. This local differentiation allows glue to be applied effectively in fold line areas while preventing glue migration to edge regions where it would cause machine soiling.
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 dust leakage by creating a continuous adhesive bond across fold lines and edges, enhancing the dust-tightness of the paper bags and maintaining machine cleanliness during production.
Implementation Method 1
at least one gluing or bonding agent activatable after the application is provided for gluing the side parts
Data Source
AI summary
This invention relates to a paper bag for bulk material such as cement, gypsum, granular material, animal feed or the like, with a bottom and with an upper part opposite the bottom, wherein bottom and/or upper part are folded and glued by closing up the side parts around side fold lines, in particular in the form of a cross or block bottom, wherein for gluing the side parts at least one gluing or bonding agent activatable after the application is provided, which is applied continuously at least from a side fold line up to at least the opposite side fold line of the side parts.