Bulk Bag Lifting Loop Spanning Sidewalls for Forklift Visibility
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Solution Overview
Problem
Current bulk bag designs have unreliable and small lifting loops that hinder efficient lifting and stacking, requiring additional support and increasing costs, as they are often shipped on wood pallets and pose vision impairment issues for forklift operators, leading to reduced lifting safety and inefficient stacking processes.
Innovation Solution
The design features lifting loops that span across large portions of the bag, with reinforcement rings and a bottleneck feature, allowing for easier engagement by forklift tines and enhanced visibility, and includes a back tack stitching feature to prevent fabric spread and maintain vertical alignment during stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lifting loops are positioned at bag corners as in prior art, then the bag structure is simple, but the loops are small and difficult for forklift operators to engage quickly
Solution Approach 1:
The lifting loop is divided into multiple segments or sections along its length, with reinforcement strategically placed at critical attachment points. This segmentation allows the loop to maintain a large overall size for easy forklift engagement while distributing structural complexity into manageable reinforced sections rather than requiring uniform complexity throughout the entire loop structure.
Solution Approach 2:
Reinforcement is applied locally at specific critical points where the lifting loop attaches to the bag panels, rather than uniformly throughout the entire loop. This local reinforcement strategy provides the necessary strength at stress concentration points while keeping the rest of the loop structure simpler and easier to engage with forklift tines.
2Illumination intensity
If lifting loops are small and positioned at corners, then the attachment structure is simple, but visibility for forklift operators is impaired especially in high stacks
Solution Approach 1:
The lifting loop design extends horizontally across the bag width rather than being confined to vertical corner positions. This dimensional change from a purely vertical corner attachment to a horizontal spanning structure creates a larger visual target that is more easily seen by forklift operators, especially when bags are stacked in high configurations.
Solution Approach 2:
Multiple lifting loops are merged or connected to form a continuous attachment structure that spans across the bag. This merging creates a larger, more visible target area that combines the visual presence of multiple loop sections into a single recognizable feature for forklift engagement.
3Reliability
If lifting loops are attached to only 1/4 of the lifting power at each corner, then the attachment is simple, but lifting safety is reduced
Solution Approach 1:
Reinforcement structures are pre-installed at the lifting loop attachment points during bag construction, before the bag is filled and put into service. This preliminary reinforcement ensures that the attachment points are prepared to handle maximum lifting loads from the outset, distributing the lifting forces more effectively across reinforced anchor points rather than relying on simple corner attachments.
Solution Approach 2:
The lifting loop attachment structure combines multiple materials or structural elements, such as reinforced fabric layers, metal grommets, or composite stitching patterns, to create an attachment system that can handle higher lifting loads. This composite approach distributes the stress across multiple materials with complementary properties, enhancing overall lifting safety.
4Productivity
If bulk bags are shipped on wood pallets to speed up lifting, then lifting speed improves, but costs increase significantly
Solution Approach 1:
The bulk bag design incorporates self-contained lifting features that enable the bag to be lifted directly without requiring external pallets or additional support structures. The reinforced lifting loops are designed to work autonomously with forklift tines, allowing the bag to serve its own lifting needs and eliminating the requirement for costly wood pallets.
Solution Approach 2:
The wood pallet component is extracted or removed from the lifting system entirely. Instead of relying on pallets as an intermediate lifting aid, the design takes out this unnecessary element and relies solely on the enhanced lifting loop attachment system to provide direct forklift engagement, thereby eliminating the associated costs.
Data Source
AI summary
An improved bulkbag and method of making same, of the type having four sidewalls, a floor and top portion, all portions stitched together to define the enclosure for the bulk bag housing material. The bag comprises a plurality of four wall panels, which each panel having a first and second vertical edge for sewing into the next adjacent panel along each edge. Prior to sewing the panels together, to each upper edge of each panel there is provided a first and second leg of a lifting loop, so that each loop spans from the first edge to the second edge of each panel. The panels are then sewn together along their edges, and there is defined the bulk bag, with the ends of each of the four lifting loops terminating at the stitch line between panels, which define the middle of each sidewall of the bag. There would then be provided a reinforcement ring at each point where a pair of legs of lifting loops are stitched to strengthen the attachment point. Further there would be provided at each lifting loop attachment points a dart, or stacker seam to define the bottleneck feature of the bag. The lifting loop attachment points would define a vertical seam along the surface of the dart defined by the stacker seam. Further there is provided a back tack stitching feature to prevent spread forces in the filled bag, and reinforcing strapping in the loops to provide a stiffening feature to the loops.