UF system is an indispensable component of E-coating and its problem means the problem of E-coat line. POLYSEP UF system incorporates long time experience and improvements supported by continuous research. It provides economical and trouble free operation.

CHARACTERS OF UF SYSTEM POLYSEP
■ Stable permeate supply.
■ Simple and compact design with trouble free operation.
■ Power saving by slow pump operation at week-end.
■ Possible to combine with Reverse Osmosis system.
■ With the special construction of UF module and piping design no clogging in 24 hrs under unexpected power failure.
■ Easy membrane cleaning and good recovery.

E-coat paint development is rapidly changing the demand on the UF membranes performance. Membrane once good for certain type of paint may be no longer good for new type of paint. UF membrane must keep up with the change of paint technology.

We use flat membrane and fabricate it into spiral type because flat membrane is the most versatile for incorporating new membrane materials.

This is our new membrane for the new paint. We have several membrane types from which to select

■　High permeate rate.
■　Low cost for per liter of permeate.
■　Permeate rate :2--3.5Ｌ／min per element depending on paint types.
■　Throw-away cassette type, easy membrane replacement.

About 20-25% of paint that is supplied to ED-tank is carried out as liquid paint with jobs being coated.  This paint does not form coating film so it is an enormous waste.  UF reclaims more than 95% of this drag out paint.   HOW is it done? ED bath paint is fed to UF filter under pressure.  When the paint contacts the UF membrane under pressure, small molecule components such as water, solvent and inorganic salts pass through the membrane's pores, while larger molecule components such as resin and pigments can not pass through the pore and retained on the paint side and is returned back to the ED bath.  The part that pass through the membrane is called PERMEATE.  PERMEATE is used as the rinse solution after E-coating.  As the works  come out of the tank they carry out extra paint attached on the work’s surface.  This drag out paint is rinsed by the rinsing solution (PERMEATE) and returned back to the paint bath. Net result is to recovery of the drag out paint.

After E-coating, the jobs are baked in the oven. If the job is not well rinsed, the liquid paint sitting on the job’s surface will leave undesirable random marks making a poorly finished surface.  Rinsing jobs surface thoroughly with UF permeate improves finished surface.

Inorganic salts are carried by the jobs into the ED-bath from pre-treatment tanks.  In some case excessive solvent builds up in the bath.  Both of these excessive components cause painting problems. UF solves these problems.  

How is it done?

As mentioned earlier, PERMEATE contains inorganic salts, solvent and water. So by draining PERMEATE both salts and solvent are removed from the paint bath.

As seen UF is a very important part of the E-coat system, and failure of UF means poor finishing quality and poor economy.  Therefore, we kindly request that proper maintenance attention be given every day.

UF MODULE TYPE

TYPE	ED-300	ED-400	ED-500	ED-600	ED-800
MEMBRANE AREA	3m2	4m2	6m2	13.5m2	25m2
FLUX	1--1.5L/ｍｉｎ	1.5--2L/ｍｉｎ	2--3L/ｍｉｎ	4--6L/ｍｉｎ	8--10L/ｍｉｎ

1 UF MEMBRANE  UF membrane is the most important component that comes in contact with paint. To keep the surface from getting clogged up, many chemical and mechanical measures are incorporated. Various material available for choice. Pore size 0.01micron Surface treatment special suface treatment 2 SPACER  Determines the flow channel gap and promote turbulence which breaks gel layer. 3 BACKING MATERIAL  Support membrane under high pressure, and provides permeate flow channel.

Managing of paint in your E-coat tank is a very important factor for production of stable permeate. The paint parameters range suggested by paint supplier may not be suitable for the UF operation. Most of cases the parameter range for stable UF operation is much narrower than that suggested by paint suppliers. We invented a method to find this parameter range, or the 「WINDOW」 suitable for the UF operation by running lab test, and inform the result to our customer. Tanks kept in this 「WINDOW」 experience trouble free operation.