Polyurethane Bottom End Cap for Pleated Filter Cartridge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pleated filter cartridges with molded bottom end caps having horizontally extending ledges face challenges in manufacturing, leading to reduced filtering efficacy and increased contamination risk due to particulate accumulation, especially during pulse jet cleaning.
Innovation Solution
A method using a mold with an elastomeric surface and a polymerizable potting compound to form a polyurethane bottom end cap, which cures rapidly, minimizing ledge formation and enabling commercial-scale production by preventing permeation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If two-part epoxy resins are used to form the bottom end cap, then the molding process can be completed, but the curing time is long and ledge formation occurs
Solution Approach 1:
The patent changes the chemical composition parameter by substituting two-part epoxy resin with polyurethane resin, which has different curing characteristics. This parameter change enables rapid curing while maintaining the required manufacturing precision of the bottom end cap formation, thereby resolving the contradiction between curing time and manufacturing precision.
2Ease of manufacture
If two-part epoxy resins are used, then the bottom end cap can be molded, but horizontally extending ledges are formed causing particulate accumulation
Solution Approach 1:
The patent changes the material parameter from two-part epoxy resin to polyurethane resin, which has different flow and curing characteristics. This parameter change eliminates the formation of horizontally extending ledges during curing, thereby preventing particulate accumulation while maintaining ease of manufacture of the bottom end cap.
Solution Approach 2:
The patent converts the harmful effect of resin permeation and leakage into a beneficial outcome by using polyurethane resin's rapid curing property. The rapid curing minimizes the time the resin is in a permeable state, thereby reducing ledge formation and particulate accumulation, while still allowing complete curing for manufacturing purposes.
3Manufacturing precision
If the molding process is slowed down to prevent ledge formation, then ledge formation is reduced, but production speed decreases
Solution Approach 1:
The patent changes the chemical composition parameter by using polyurethane resin with rapid curing characteristics. This allows the molding process to maintain high production speed while achieving the manufacturing precision required to prevent ledge formation, as the rapid curing occurs within a short window that can be controlled during the molding process.
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 rapid curing of polyurethane reduces ledge formation, enhances filtering efficiency, and facilitates high-speed commercial production by minimizing diffusion and leakage, thus maintaining filtering effectiveness and reducing contamination risks.
Implementation Method 1
The potting compound is selected to form a polyurethane bottom end cap after polymerization is complete
Data Source
AI summary
Disclosed in this specification is a method for making a pleated filter cartridge by placing a pleated filter on a mold and adding a polymerizable potting compound to the inner cavity of the pleated filter. The potting compound is permitted to cover the portion of the upper surface of the mold that is encompassed by the pleats. The potting compound is selected to form a polyurethane after polymerization is complete.