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Question by Fungyi: Can i get solvent-melted polystyrene from model kits to cure as hard as before I melted it?
I’ve been making some plastic coatings for wood by dissolving polystyrene (from plastic model kits) into paint thinner in room temperature. So far, i’ve brushed a number of layers throughout one week to accumulate a solidified film, thickness of about .25 millimeters. However, i noticed that my melted polystyrene is no where as hard (resistence to deformation/tensile strength) as before i melted it…

Do solvents degrade a plastic by ~entering~ it? In my case, do the solvents EVER fully evaporate? Even if i bake it, will my solvent-melted plastic ever be as strong as the injection-molded version?

…i scrapped some old projects with acrylic lacquer paints on it painted YEARS ago, & i could still dent the film with just my FINGER NAILS. On the other hand, the same kind of paint required a KNIFE to scrap off its bottle after only months of opening it. What’s the deal?

ps please don’t suggest to use something other than polystyrene; i’m interested in polystyrene only
the outcome i’m looking for is simply the hardest coating i can get to cover wood

Best answer:

Answer by David W
the polystyrene has oil in it ant the solvent dilluted it, at where I work we vacuum form the piece on the wood, taking a sheet of styrene, heating to wave point, and lowering onto the mold all in one action, what outcome are you looking for??

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In this tutorial i will show you how to create the cavities and extract a core from a part in SolidWorks. Download the part file from here: uploading.com
Video Rating: 4 / 5

Question by jack h: I need a dissolvable plastic that loses anywhere from 1 gram to 30 grams if submerged in water for a week?
I need a dissolvable plastic, something that dissolves relatively fast 1-30 grams in a week of being fully submerged in water. I know about PLA and PLGA and all that nonsense, but I dont know the ratio… will I have to do that myself? It can be any form of solid as I am injection molding it.

I know the ratio will determine the rate, I am just trying to determine if these can plastics be designed to dissolve relatively quickly?

Best answer:

Answer by nimatehrani
No plastic but maybe pseudo-plastic. Look for some alcoholic mixtures of carbohydrogens.

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Plastic flow analysis totally integrated into the CAD environment. The user can evaluate all typical moulding issues such as gate size & location, thickness distribution, feeding & cooling layout, welding lines, moulding machine opening force, cycle times, part warpage and many others. For more information, please visit www.vero-software.com

Testimonials of how Doug Hall’s Eureka Winning Ways program helped small to mid-sized companies grow by 20% or more.
Video Rating: 0 / 5

Question by Matty: What type of plastic is an alarm clock made from?
It’s just a simple bed side alarm clock. It doesn’t have to be the exact plastic. Just a plastic it could possibly be made from. I know the alarm clock has been made using injection moulding so the plastic must be able to be used for this type of form.
Need to know for technology. We had to disassemble something and then explain what each part was made from and why it was made from it.

Best answer:

Answer by Alissa P
look it up on the brands site. why must you kno this?

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Question by hacker: 92 festiva oil coming up on motor and oil in the plastic going from the breather to the fuel injection port?
I had a new timing belt put on prior to this but has never had any power since. I had the engine totally overhauled about a year ago and it ran fine but since I replaced the timingbelt it hasn’t ran right sence. there is no power at all. I replaced the PCV valve but still get oil back in the breather area from breather to fuel injector.The engine shuts off real fast like its to tight and there is oil that drips on the floor, uses about a half quart every 30 or 40 miles.There is blue smoke that comes out periodically but not all the time.There is a small water leak on the floor, could this be from the water pump leaking on the timing belt ,and cause the timing belt to jump time.Sometime it is hard to start when you turn it off so I let run to get back home. Have put new plugs and coil wire in it. What could be my problem. THANKS

Best answer:

Answer by Jcontrols
Do a compression check.Sounds like excessive blow-by in one of the cylinders,,;-(=

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Question by Brijesh: Plastic Injection Molding Operation, Need 2 purge the barrel from Blue 2 White. (polyolefin base)?
Traces of blue color is not cleaned completely.

Best answer:

Answer by markmold
There are several commercially available purging compounds that work quite well. I’m assuming you want the quick fix though. When I don’t have any of the commercial stuff available I usually reach for some acrylic regrind that I have lots of on hand and was given by another molder. If you have any blowing agent this also works well.
Here’s an old molders trick try sprinkling a little Baking Soda into the mix and crank up the temps a bit, a few drops of water won’t hurt either. It might foam up a bit but it’ll scrub the residuals out.

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Question by pamela_hoang: anyone know who is supplier of plastic injection molding machine from Thailand?
pls. i want to buy an injection machine, if know please introduce me or webpage of that section

Best answer:

Answer by itvcharter
Try Pico International Inc.

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Question by charLee: do you need a cooling tower to cool the molten plastic from the plastic injection molding machine?
how does the molten plastic inside the mold cool? does is cool all by itself? please help…i am really confused…do you know how many kw cooling towers consume per hour?

Best answer:

Answer by Aydin
The most economic answer is not. I mean you don’t need any cooling tower but it depends on the situation and amount of plastic which you are injected in mold.
As I saw different cases for commen mold they don’t use any cooling equipment and plastic cools down itself.

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