 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
PET, PA6/66, PBT Polyester Filter | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
§ Cleaning Process 1. Steam Hydrolysis Cleaning 2. Alkali cleaning、Washing 3. High Pressure Washing 4. Ultrasonic Cleaning 5. Bubble Point Testing § Introduce  1. Steam Hydrolysis Cleaning Steam Hydrolysis cleaning system mainly used for cleaning the polyester, Polymers in the filtration core has fast hydrolysis under high temperature water vapour. It is resulted in polymers of low molecular weight which causes high polymers to loose high viscosity and high adhesive force to make it apart from the filtration core and the core cleaning is done.  2. Alkali cleaning、Washing The filter after hydrolysis and cooling shall be disassembled and put into filter alkali cleaning trough. Clean the work piece with KOH(20%-30%) cleaner to wash away lumps made from combination of TiO2 and polymers.  3. High Pressure Washing High-pressure cleaning machine is used to remove Tio2 and alkali remaining in the filter core.Fully automatic process with programmable microprocessor controller for cleaning of single filter elements.Systems available for various filter candle dimensions and variable systems for different candle dimensions.  4. Ultrasonic Cleaning After high-pressure cleaning, ultrasonic cleaning follows to further remove remaining for fully clean, then bubbling inspection is used.  5. Bubble Point Testing The filter is submerged to a predetermined depth in the test liquid; air is introduced into the core of the filter with the pressure gradually increasing. The test liquid pushes through the filtering medium surface at a position on the filter body in line with the largest pore size or notable hole. The pressure at which air bubbles are emitted from the surface relates directly to the bubble-point pressure. § Equipment comparison 1. The Disadvantages of TEG Cleaning ★If there is not sufficient melting in vacuum cleaning stage, calcination is easy to cause damage of the filter element. ★TEG cleaning is not environmentally friendly, and high operating costs ★Due to TEG media flammable, explosive, the cleaning room needs to design according to explosion-proof requirements. 2. The Advantages of Steam Hydrolysis Cleaning ★ Low operation cost is due to the only water, electricity and steam as materials in a hydrolysis furnace ★ The hydrolysis furnace is Environment-friendly. ★ The duration of hydrolysis is short. § Model Selection 1. PET Project
|
