Ethyl Acetate Vaporization

When there is greater relative humidity, it could affect the evaporation rate, but I don't think that's where the problem is. The issue is, you need to get all of the ethyl acetate out of the adhesive before it hits the laminator. Usually I can tell just by smelling the web as it comes out of the oven.

If it is not getting all out, slow down your line speed or increase the temperature in the oven.

Thanks for evry one who post their knowledge for good reason.to help some who really needed......

In general, my working place has 60-70% of RH, In rainy days it is increase between 85-95%. It is badly affected to the lamination process. We don't have much long oven and it has max temperature around 75-80. A month ago bubbles arise during the lamination process.Slow down the speed during the rainy days is our choice.It is reduyce the production rate.anyway I need to build the some relation between Rh and vaporization. I know these variation and are so critical.

Very firstly I thinking about the patial pressure of the EA and the patial pressure of the water. but it not a closed system. My knowlegde is limited to the closed systems. Is there any relationships for colsed loop system like boil's law...

Since you process is open heat and pressure base lamination (this is what my interpretation is ) Then you will be better of drying part before lamination overnight before starting this process. This will keep part low in moisture as well as will take care of EA removal.

Hi asitha,

Thanks for replying. The only difference between an open or closed system in this case, is the time to reach steady state after changes in the variables, in this case the H₂O partial pressure (RH).

The only reason to establish a relationship between RH and drying time would be to be able to vary the line speed or the temperature in the oven in order to ensure adequate drying of the substrate. Since your oven temp is already maxed out, you have no choice but to decrease the line speed. I know intimately how this decreases productivity, but unless you can upgrade the system, you are doing everything you can (if I am understanding the problem correctly).

Is your oven able to achieve higher temperatures, or are you limited because of the maximum temperatures the film can withstand?

It would help greatly if you would describe your process in much more detail.

Mike

hey,

Those people are giving me a grate support by sharing..thanks

such country like sri lanka, RH is varying in large scale such as 45-85% during the week.so it is very difficult to dealt with it.if I can generalise, the particular temperature for specific Rh valve. Oven temperature is very important factor for the productivity. our oven has max temp of 80 c. we can also increase the our air flow rate. further increase is cause to the vibrate the subtract. and also reduce the temperature.

I got a plan to cooperate with de-humidifier if the their is grate relation ship with RH and Evaporate. if it is not it is not worth...

I am looking for reduce the wastage of our productivity.consider about the open loop and closed one... are we can use the same equations such as "pv=nRT".

In general we use subtract PET, METPET, BOPP which are tunnel through the oven. we use 75*C as oven temperature.in general 60m/min is our speed.

I think moisture amount of air is increase during the process because of the by product of the catalytic reaction...Also I assume the moisture is affect to the curing time of the adhensive..]

Asitha

Above is true. RH effect vaporization of ethyl acetate. What you will see is if you increase your temperature you will extract all ethyl acetate out and problem disappears.

Alternate is slow down ramp this will allow more time to remove ethyl acetate since this also allow more time.

Humidity slows down extraction and is normal and we do maintain humididty in the room withim +/-5 % control and have no issue

Dear

The problem is not RH but the quality of ethyl acetate. I was Production manager for ethyl acetate for ten years and my understanding is you need Ethyl Acetate (Urethene grade) water and alcohol less than 200ppm.

Besides ethyl acetate is hygroscopic so keep the drum of Ethyl acetate (urethene grade) tight after the use.

I need your help is studying ethyl acetate and butyl acetate market in sri lanka. i want to invest in acetate production plant in sri lanka.

Gohar Alam

CR4 Admin - email address removed

From the Site FAQ: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers posted in threads or comments, and we strongly urge you not to put up email addresses. You can share this information via the CR4 internal messaging system.