Vacuum Cleaner Dust Bag Web Treatment to Prevent Edge Bonding
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Solution Overview
Problem
Existing methods for producing vacuum cleaner filter bags on block-bottom bag machines are limited by the inability to use nonwoven inner layers with high synthetic fiber content, as they tend to bond at the cut edges, preventing further processing.
Innovation Solution
A method involving a filter material web with a nonwoven fabric layer on the outside, treated with a surface-active substance to prevent bonding at the cut edges, allowing the formation of tubular sections that can be easily processed into vacuum cleaner filter bags.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nonwoven inner layers with high synthetic fiber content are used, then filter performance and durability are improved, but the material bonds at cut edges preventing further processing
Solution Approach 1:
A surfactant is applied to the nonwoven fabric layer before the cutting step to prevent bonding at the cut edges. This preliminary application of the surfactant ensures that when the tubular web is cut, the synthetic fiber layers do not bond together, allowing subsequent processing steps to proceed without obstruction while still using the high-performance nonwoven material
Solution Approach 2:
The surfactant acts as an intermediary substance between the synthetic fiber layers of the nonwoven fabric. It prevents direct contact and bonding between the fiber layers at the cut edges by creating a barrier that reduces surface tension and friction, thereby enabling the cut edges to remain separate during further processing
2Ease of manufacture
If tissue material is used as innermost layer, then processing is easier, but filter performance and durability are reduced
Solution Approach 1:
The invention changes the surface properties of the nonwoven fabric layer by applying a surfactant, which modifies the friction and bonding characteristics of the material. This parameter change allows the high-synthetic-content nonwoven fabric to behave more like tissue material during cutting and processing, preventing edge bonding while maintaining the superior filter performance of the nonwoven structure
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 use of surface-active substances allows nonwoven inner layers with high synthetic fiber content to be used, enabling efficient production of vacuum cleaner filter bags by preventing bonding at the cut edges, thus facilitating further processing without significant effort.
Implementation Method 1
A surface-active substance is a substance that accumulates greatly from its solution at interfaces and thereby reduces the interfacial tension.
Data Source
Figure 1~3
AI summary
The method involves providing a filter material course (201), where the filter material has a nonwoven layer arranged in an outside. A boundary surface-active substance (202) is applied on the nonwoven layer on a predetermined area. A hose course is formed from the filter material course, so that the non woven layer is arranged inside of the hose course. The hose course is cut, so that a hose section is received and runs within the predetermined range. The hose section is converted to a vacuum cleaner filter bag. The nonwoven layer has specific amount of chemical fibers.