Rolled Paper Bag Strand With Weakening Lines for Clean Separation
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Solution Overview
Problem
Existing rolled-up plastic bag strands require significant force or tools for separation, often leading to damage, and struggle to provide individual bags reliably to the end of the strand, especially when nearing completion.
Innovation Solution
A strand of bags connected in pairs with weakening areas or lines, using cold glue, heat seal glue, or hot melt adhesives, allowing safe and reliable separation without damage, even when nearing the end of the strand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If rolled-up plastic bag strands are connected using conventional methods, then bags can be stored in a compact form, but significant force or tools are required for separation and damage often occurs
Solution Approach 1:
The continuous bag strand is segmented into individual separable units by introducing weakening lines at predetermined intervals. These weakening lines create natural separation points that allow bags to be easily pulled apart without requiring tools or excessive force, while maintaining compact rolled-up storage capability.
Solution Approach 2:
The bag strand structure incorporates localized variations in material properties through weakening lines and adhesive application patterns. The weakening lines create zones of reduced strength at specific locations, allowing easy separation at these points while the rest of the bag structure maintains full strength for carrying loads.
2Strength
If bags are connected with strong adhesive throughout, then separation is difficult, but if connected weakly, then bags may separate unintentionally during use
Solution Approach 1:
The adhesive is applied in a controlled pattern that creates strong bonding in certain zones (between bags) and weak bonding in other zones (at weakening lines). This localized variation in adhesive strength allows the connection to be strong where needed for structural integrity and weak where separation is desired, preventing both unintentional separation and requiring excessive force for intentional separation.
Solution Approach 2:
The weakening lines and adhesive pattern are pre-configured during manufacturing to create predetermined separation points. This preliminary arrangement of strong and weak zones ensures that separation occurs cleanly at the intended locations without requiring the user to determine where to separate the bags.
3Ease of operation
If the entire strand is separated at once, then all bags become accessible, but the strand structure collapses and bags may get tangled
Solution Approach 1:
The weakening lines divide the continuous strand into discrete, independently separable bag units. Users can access and remove individual bags or small groups of bags without causing the entire strand to collapse or become tangled, as each segment maintains its structural integrity until deliberately separated at the weakening lines.
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
Ensures safe and reliable separation of bags to the last bag, preventing damage and ensuring strength for heavy items, even when unwinding, with potential for paper-based, recyclable, and lightweight designs.
Implementation Method 1
The connection of the bag bottom areas is based on cold glue, cold seal glue, heat seal glue or hot melt adhesives
Data Source
Figure 1a~1b
Figure 2
Figure 3a
AI summary
The present invention relates, in particular, to strands of bags (1) in a coiled state, comprising a strand beginning (2) and a strand end (4), containing a plurality of bags (10) connected in pairs, formed from or comprising paper webs, wherein the bags can be separated from one another by means of weakening areas or a weakening line (36). The connection of the bag bottom areas (28) can be effected by means of cold glue, cold seal glue, heat seal glue or hot melt adhesives.