solitheater.blogg.se - Exposure time for 160 mesh scrfeen speedball emulsion

#EXPOSURE TIME FOR 160 MESH SCRFEEN SPEEDBALL EMULSION PRO#

Pin holes are hard to get rid of completely, no matter how careful you are.

Take your time in this part of the process if you move your scoop coater to fast the tiny air bubbles in your emulsion will not pop and leave very small pin holes in the coating. Keep your exposure area clean and dust free.

Dirt or dust on transparency or glass during exposure.

This will help any air bubbles you do have pop as the emulsion goes onto the screen. Do not be tempted to coat the screen to fast, use a smooth slow coating speed. Let the emulsion settle for a few hours after mixing. Once dry, coat before the dust can settle back on it.

Dirt and dust on the screen during coating.Pin Holes and Air Bubbles in exposed screen. Using a hairdryer on your screen is bad, bad idea. In normal room temperature emulsion will take a good 24hrs to dry fully. Resist the temptation to get your screen done asap. Emulsion not fully dry before exposure.Too much in the trough and it will spill out. This will also help with a clean tidy coating. So make sure to put just enough inthe scoop coater. It can get contaminated with dirt and dust and just helps toward deterioration of the product. We recommend you don't scrape unused emulsion back into the tub.

#EXPOSURE TIME FOR 160 MESH SCRFEEN SPEEDBALL EMULSION PRO#

Print-Lab Pro Tip: Check the manufacturers guidelines, then write a started by and use by date on your emulsion tub. If it is still a little damp the emulsion won't stick properly. This prevents dust and dirt settling back on your nice clean screen. Coat the screen as soon as it if fully dry. Dirty or contaminated screens could add to emulsion problems. Make sure to clean up your screen properly using Mesh Prep / Degreaser. If you have dents, scuffs or roughness in the edge of the coater, then its time for a new one.

For a nice smooth even coat make sure the edge of your scoop coater is in good condition.

As this is not possible you are unlikely to get a correct exposure. Too thick or too thin a coating of emulsion causing thick or thin spots that have under or over exposed leading to washout problems (which you are then tempted to blast out.) Variable thickness in your emulsion would require a variable exposure time. Give the screen a little soak for 30 secs before starting the wash out. Don't blast the emulsion out too quickly, turn down the pressure and keep the water flow or jet moving about the screen.

Water pressure is too high during wash out.

If its breaking down during printing this is also a common sign of under exposure.

If your emulsion is totally washing out or falling off, your screen is definitely under exposed. Or both! Without enough light and for too short a time the emulsion does not fully bond and go hard during exposure. It could be that the light source is not bright enough (or the wrong kind of light waves). Under exposure means not enough light is hitting the emulsion coating on the screen. Emulsion washing off or breaking down in wash out. Not just the bits you want to come out but all of it or more than the exposed part: Here are some common issues, the causes and remedies. Whilst this can all sound quite negative, you can expose your own screens easily and we're here to help you make it happen!

With the super high quality screen printing products available it is rarely the products that are faulty, its almost always in the process. We think our screen looks great only to find that we have a bunch of problems when it comes to exposing them.Ī few of the problems can have the same causes so if you can sort those you are on to a win.