Vacuum Cleaner Filter Bag Weld Seam for Burst Resistance
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Solution Overview
Problem
Vacuum cleaner filter bags made of nonwoven materials face issues with weak weld seams, particularly when heavily clogged, leading to bursting or tearing, especially when welding multiple layers or high basis weights, resulting in uncontrolled dirt escape.
Innovation Solution
A vacuum cleaner filter bag with a weld seam featuring alternately welded and non-welded regions, where the welded regions are 1.0 mm to 10.0 mm long and the non-welded regions are greater than 1.0 mm to 5.0 mm, providing increased tensile strength without compromising separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous linear weld seams are used to join filter material layers, then sealing completeness is improved, but tensile strength and resistance to bursting deteriorates
Solution Approach 1:
The continuous weld seam is divided into discrete welded regions (1-10 mm length) separated by non-welded regions (>1-5 mm length). This segmentation prevents stress concentration along the entire weld line, allowing the filter bag to withstand higher tensile loads and bursting pressures while maintaining adequate sealing through the distributed welded segments.
2Quantity of substance
If ultrasonic welding is applied to nonwovens with basis weight >200 g/m2 or multiple layers, then filtration capacity is improved, but weld seam strength deteriorates
Solution Approach 1:
The welding process applies localized energy input only in specific welded regions rather than continuously along the entire seam. This localized approach concentrates ultrasonic energy where needed to create strong bonds in high-basis-weight or multi-layer configurations, while the non-welded regions between them allow stress distribution and prevent catastrophic failure.
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 significantly enhances the tear resistance of the weld seam, preventing bursting even under high mechanical stress while maintaining separation efficiency, with tensile strengths of at least 30 N, effectively addressing the weaknesses of traditional weld seams.
Implementation Method 1
The present invention relates to a vacuum cleaner filter bag made of a thermally weldable filter material... at least one linearly extending weld seam, by means of which the internal space... is sealed... the weld seam thereby joins at least two layers of the filter material together
Implementation Method 2
made of a thermally weldable filter material which forms the sealed internal space... at least two layers of the filter material are welded together
Data Source
AI summary
The present invention relates to a vacuum cleaner filter bag made of a thermally weldable filter material which forms the sealed internal space of the vacuum cleaner filter bag. The internal space is thereby closed at least on one side by means of a weld seam configured according to the invention, in the case of which at least two layers of the filter material are welded together. The weld seam configured according to the present invention is distinguished by a far higher tearing strength, compared with weld seams as are known from the state of the art. The invention relates in addition to a method for the production of the vacuum cleaner filter bag, to a tool for the production of the high-strength weld seam and also to an ultrasonic welding unit in which this tool is integrated.