Multi-material Vertical Form Fill Seal Bag Web
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Solution Overview
Problem
Traditional plastic film bags lack ventilation for perishable items, while mesh bags are not easily viewable or cost-effective for labeling, and existing form, fill, and seal machines increase production costs due to separate manufacturing steps.
Innovation Solution
A multi-substrate web combining polymeric mesh and film strips that can be heat-sealed to form a continuous sheet for use in a form, fill, and seal machine, allowing for adequate ventilation, labeling, and secure seams, with adjustable strip configurations for different bag designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional plastic film is used for bag construction, then the bag provides good visibility and easy labeling, but it lacks sufficient ventilation for perishable items
Solution Approach 1:
The patent uses a composite material structure combining polymeric film and polymeric mesh in a single web. The film portions provide visibility and labeling surfaces, while the mesh portions provide ventilation. These different materials are bonded together to create a unified bag structure that simultaneously delivers optical properties, ventilation, and structural integrity.
2Strength
If separate polymeric film strips are applied to mesh bags for reinforcement and labeling, then the bag gains improved seam strength and labeling capability, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the reinforcement function and labeling function into the primary bag structure itself. The polymeric film portions are integrated into the web and serve dual purposes: reinforcing the seams through heat bonding and providing labeling surfaces. This eliminates the need for separate film strip application steps and reduces manufacturing complexity.
Solution Approach 2:
The reinforcement and labeling capabilities are built into the web structure before bag formation. The polymeric film strips are pre-positioned and bonded to the mesh in the web, so when the bag is formed, the seams are already reinforced and the labeling surfaces are already in place, eliminating subsequent manufacturing steps.
3Object-affected harmful factors
If all-mesh bags are used for ventilation, then the bag provides sufficient airflow for produce, but the items cannot be easily seen and separate film strips are needed for labeling
Solution Approach 1:
The patent creates a composite web where polymeric mesh portions provide ventilation and polymeric film portions provide visibility and labeling surfaces. This composite structure allows the bag to simultaneously achieve airflow permeability and optical transparency where needed.
4Object-affected harmful factors
If half-and-half bags with separate mesh and film sheets are used, then the bag achieves both ventilation and visibility, but the manufacturing process becomes more complex with multiple sheets to align and bond
Solution Approach 1:
The patent uses a composite web structure where mesh and film portions are integrated in a single material layer. This eliminates the need to align and bond separate sheets during manufacturing, as the different material properties are already configured in the final bag structure through the web design.
Solution Approach 2:
The patent merges the ventilation function and visibility function into a single integrated web structure. The mesh and film portions are combined in one continuous material that is formed into the bag in a single process, eliminating the need for separate sheet alignment and bonding operations.
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 enables the production of bags that are cost-effective, securely retain items, and allow for easy viewing and labeling, while reducing manufacturing costs by integrating ventilation and labeling capabilities into a single continuous sheet process.
Implementation Method 1
The sheets include strips of a polymeric film and a ventilating polymeric mesh connected to one another along a longitudinal seam
Data Source
AI summary
A multi-substrate sheet for forming an at least partially open mesh fabric bag using a form, fill and seal machine and a bag formed of this sheet are provided. The sheet includes at least one strip formed of an open mesh polymeric fabric and at least one strip formed of a polymeric film. The fabric and film strips are secured to one another to form a web that can be formed into a roll and utilized with a form, fill and seal machine. The bag resulting from the processing of the web by the machine includes a substantial open mesh fabric portion to provide adequate ventilation to the product positioned within the bag and a printable film portion.