Pleated Filter Pack Spacing Structure for Lower Pressure Loss
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Solution Overview
Problem
Conventional methods of forming a space holding member on a filter medium using a hot melt adhesive result in lateral expansion, leading to difficulties in maintaining the desired shape and increasing pressure loss.
Innovation Solution
A filter pack with a filter medium having pairs of ventilation surfaces and a space holding member composed of a base material layer and a space forming layer, which are applied orthogonally to the folds, to maintain pleat spacing while minimizing pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hot melt adhesive is softened to enhance adhesiveness to the filter medium, then adhesiveness is improved, but the lower portion of the space holding member expands laterally after transfer, causing shape distortion
Solution Approach 1:
The space holding member is divided into multiple layers (first space holding member and second space holding member) that are stacked and bonded together. This segmentation allows the adhesive to be applied in a controlled manner between layers, preventing lateral expansion and shape distortion while maintaining strong adhesion to the filter medium.
2Ease of manufacture
If space holding member is formed on filter medium by transfer, then ease of manufacture is improved, but pressure loss increases due to lateral expansion of the space holding member
Solution Approach 1:
By dividing the space holding member into multiple layers stacked on top of each other, the adhesive application is confined to specific interfaces between layers rather than spreading laterally across the filter medium surface. This maintains the pleat spacing and airflow characteristics, reducing pressure loss while keeping the transfer manufacturing method.
3Ease of manufacture
If hot melt adhesive is applied to form space holding member, then ease of manufacture is improved, but desired shape cannot be obtained due to lateral expansion
Solution Approach 1:
The space holding member is constructed by stacking multiple layers (first and second space holding members) that are bonded together through controlled adhesive application. This layered structure confines the adhesive to vertical bonding interfaces, preventing lateral expansion and enabling precise control of the space holding member's shape and dimensions while maintaining ease of manufacture through the transfer method.
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 filter pack effectively maintains pleat spacing without reducing the effective area, thereby suppressing pressure loss and enhancing the collection efficiency.
Implementation Method 1
the hot melt resin is softened for obtaining adhesiveness
Implementation Method 2
a space holding member that holds a space between each of the pairs of ventilation surfaces
Data Source
AI summary
Provided are a filter pack capable of suitably maintaining a space between pleats while suppressing an increase in pressure loss, and an air filter provided with the same.The filter pack includes a filter medium that collects fine particles in a gas and has multiple pairs of ventilation surfaces which are continuous and face each other through alternating folds due to pleating, and a space holding member that holds a space between each of the pairs of ventilation surfaces, and that is formed extending in a direction orthogonal to the fold on at least one of the pair of ventilation surfaces and has a base material layer and at least one space forming layer formed on the base material layer.