» Moisture formation on the mold surfaces
Moisture formation on the mold surfaces
Hi, I would like you to inform me about prevention methods against moisture formation on the mold surfaces in the hot summer whether conditions.As you know, the water vapor in the hot air condensates on the water cooled mold surfaces and causes product defects because of the wet cavities and corrosion of the mold.
Dear Sir, i have a idea, if the materials need dry, but you don't dry or the drying time is not enough, it is easy to form water mark in the surface, so i suggest to dry the materials.Hope the information will help you.
Dear professionals, that you for your kindly answers and interests.
However, the moisture formation problem which I have mentioned above is about the moisture droplets generation on the outer surfaces of the mold pair, not on the surrounding of the cavity region.These droplets are generated in the contact case between cold mold surface and hot air.Consequently, I cant decrease the cooling water temperature below 20 C' , if I decrease it below 20 C', this causes more water droplets and those flows in to the cavities.This state limits me about the cooling control of the process.Also wet and water droplet formatted mold loses its corrosion resistance and I can see uniform corrosion or oxidation on the mold.
I guess, the mold users who live in the Mediterranean or in any other tropical regions may experience the same problem.
Thank you for your detail explanation.
yes, it may happen in the wet regions. But as long as we keep in good maintenance, clean the wet surface of the mould and spay the rust preventing oil after unloading the mould when finishing production.
What you are describing is "mould sweat." There are a few systems available to handle mould sweat because it is a little tricky. The area around the mold must have a dewpoint of air which is less than the cooling temp of the tool. In other words, it cannot be air conditioned, it has to be dehumidified and cooled. Try a robot enclosure around the mould area and connect a mould sweat protector that will dry the air in the enclosure. Dewpoint of 4C is fairly standard but a non-refrigerated dehumidifier will supply an enclosure temp of 70C due to blower temp and latent heat. So, it is a bit specialized for this application by providing refrigerated, dry air. There are lots of new and used sources for this equipment.
Either dehumidify the molding environment (air conditioning included ) or run the mold temp above the dew point, which varies. When there is less relative humidity you can run a cooler mold and faster cycles hopefully.
Keep On Molding
Hi, Good day! Regarding to your question, I go specially to consult my engineer on corrosion of the mould in the hot summer. And here's my suggestions:
1. Keep the room for mould placing dry. and spray antirusting additive after production on time.
2. Do electroplating to the surface of the mould. (cheap way)
3. Use stainless steel material to make the mould next time. (more expensive)
You can place the moulding machines in air conditioned atmosphere and keep the temperature and humidity under close control. This will reduce mould sweating. Or you can chose to install a mould are dehumidifictaion system. This will enclose the mould area and pump in dry and cold air. This is more effective.
we have had this problem, we tried a lot of remedy's ( insulate mold and pipes, build enclosure around machine with dehumidifier, ect.) the only thing that helped was to insulate pipes and hoses off the mold, and turn the mold so pipes were on the side, not top so water would drip elsewhere. not very hi tech, but it did work.
I am facing the same problem and analysed the different solutions... Still I am not finalized any of them.. as I am not sure which one will work the best.. You have to analysed these according to your conditions..
1. Tried to cover the mould area in a cabin and air conditioning it.. But you can't put the injection area in the cabin as it will reduce the temperature and will require more power..
2. Using a heavy exhaust fan to suck the air (where moisture is being formed) and throw out.. BUT it won't work.. Strictly No... Because you have to reverse the process if you want to remove moisture..