Wet/Dry Vacuum Bag Assembly With Wicking Barrier and Impact Shield
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Solution Overview
Problem
Existing vacuum cleaner bags are either inexpensive but weak when wet, or strong but expensive, and often fail to maintain effective filtering characteristics in both wet and dry conditions, leading to premature float valve activation and potential damage from debris impact.
Innovation Solution
A vacuum cleaner bag assembly comprising a non-woven panel assembly made from a wood pulp and polyester blend, combined with a flexible plastic shield member and a wicking barrier, which provides structural support, prevents debris impact, and inhibits fluid displacement to prevent float valve activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If paper bags are used, then cost is reduced and filtering is effective, but strength when wet deteriorates and rupture resistance is poor
Solution Approach 1:
The patent applies composite materials by combining paper (providing filtering capability) with plastic coating or lamination (providing wet strength and rupture resistance). This creates a hybrid bag structure that simultaneously achieves low cost, effective filtration, and durability when wet, resolving the contradiction between paper bag affordability and wet strength deficiency.
2Strength
If cloth bags are used, then strength when wet is improved, but cost increases and filtering characteristics deteriorate
Solution Approach 1:
The patent uses composite materials to achieve the strength characteristics of cloth bags while maintaining the low cost and superior filtering of paper. The paper-plastic composite structure provides cloth-like durability when wet without the high cost and poor filtration performance of traditional cloth bags.
Solution Approach 2:
The patent applies local quality by selectively reinforcing specific areas of the bag with plastic coating or lamination, particularly in regions subject to wet conditions and debris impact. This localized reinforcement provides enhanced strength where needed while maintaining the overall low cost and good filtration characteristics of the paper structure.
3Strength
If cloth bags are used, then strength is improved, but filtering characteristics worsen and inflation tendency increases
Solution Approach 1:
The patent employs composite materials where the paper component provides excellent filtering characteristics while the plastic component provides strength. This combination maintains reliable filtration performance even when wet, unlike cloth bags that allow debris passage, while simultaneously providing the strength needed to prevent rupture.
Solution Approach 2:
The patent applies local quality by using plastic coating or lamination selectively on the paper bag structure, preserving the paper's superior filtering characteristics in areas where filtration is critical while providing enhanced strength and wet resistance in areas subject to mechanical stress and liquid contact.
4Strength
If wet bags are used, then volume increases due to inflation, but float valve activation is premature
Solution Approach 1:
The patent uses composite materials to create a bag that does not inflate when wet, unlike cloth or untreated paper bags. The plastic-coated or laminated paper structure maintains its shape and volume stability even when saturated, preventing false float valve activation while providing the necessary wet strength.
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 offers a cost-effective, strong, and effective filtering bag that maintains performance in both wet and dry conditions, preventing premature float valve activation and reducing debris-related damage, while allowing for efficient air flow and easy disposal.
Implementation Method 1
a non-woven panel assembly made from a wood pulp and polyester blend... provides structural support, prevents debris impact, and inhibits fluid displacement
Implementation Method 2
a wicking barrier, which provides structural support, prevents debris impact, and inhibits fluid displacement to prevent float valve activation
Implementation Method 3
a flexible plastic shield member and a wicking barrier, which provides structural support, prevents debris impact
Data Source
Figure 1A~1B
Figure 2~6
Figure 3
AI summary
A vacuum cleaner bag assembly is adapted to be removably disposed within a tank of a vacuum cleaner, and the bag assembly includes a panel assembly made from a first material and forming an enclosure having an interior volume, and an aperture extends through the panel assembly. A shield member may be disposed within the interior volume and secured to one or more portions of the panel assembly, and the shield member may comprise a second material that is different than the first material. The first material may have a wicking barrier that inhibits wicking when the bag assembly becomes wet. The shield member is adapted to protect a portion of the panel assembly when the vacuum cleaner bag assembly is disposed within the tank and, together with the wicking barrier and a properly chosen first material, enhances performance of the vacuum bag assembly when wet.