Sooner or later, every math instructor is left with stacks and stacks of transparency sheets covered head-to-toe in Vis-a-vis scribbles of sigmas and circumferences, of radicals and radii. While the process for cleaning them is simple, involving just time with a spray bottle and paper towel, the task is time consuming, especially with accelerated math teachers, who have classes full of nerds and no detention hall students to shift the burden to.
So, would it not be too difficult to build a small device, which would feed a used sheet through, and return a clean, dry sheet ready for re-use? Diffrent methods of cleaning could be used:
1) Pool of water and brush As the transparency sheet moves through a pool of recirculated water, filtered and replaced often, a brush wipes off any stubborn marks. Requires frequent brush changing.
2) Pool of rapidly moving water As the transparecy moves through rapidly moving water, the markings are removed.
3) Ultrasonic cleaner The transparency moves through a pool of water agitated by a ceramic ultrasonic chip, like the ones used in optics cleaning.
All of these methods could work, but would require a means of filtering and recirculating the water, etc. However, most work with it would be done as a batch job.
Could also take long, continuous 'scroll' sheets for overheads with rollers.-- Baker^-1, Feb 03 2004 As long as it's multiple choice I'll choose 4) All of the above.-- 2 fries shy of a happy meal, Feb 03 2004 I imagine something like the old electric washtubs with a roller above a ramp that lets the squeezed water flow back into the tub. something the teacher could take into the bathroom (or find the hapless detentioner to do this), and do it in a sink. there would be the portable versiion, like I mentioned above, and the delux "department level" model.
No, this is serious. I'm a first year teacher with two inches of transparencies that I would like to recycle.-- rsw4010, Feb 12 2006 Allow it to print vis-a-vis via ipod? [+]-- daseva, Feb 12 2006 As a math teacher myself, you have just ruined my attempt to an early retirement. I have had this on my mind for two years now and just don't know where to begin. You have no idea how annoying it is to clean these puppies (even though students (young ones) drop everything to help you). It would sell HUGE in schools, so i know that marketing would not be a problem. I don't know the science behind it, but it seems like it wouldn't be too difficult to construct. However, Mechwacko..you talk about a cleaner for the transparencies on a roll, what about the single sheets...those are more commonly used. Thanks,-- school23, Aug 30 2006 I think transparancies of either sort could be cleaned by prolonged immersion in hot soapy water, perhaps with gentle agitation. [school23], just fill your cooler with water, add some dishwashing detergent, dump in your transparencies and leave them.-- bungston, Aug 30 2006 I think the cleaning of the transparencies is not really the main problem. I find that they all come clean by just running a little water over them. The problem is that it takes forever to hand dry 30 transparencies, and then there is the problem of space to lay them out if they are not completely dry.-- lundsr1, Sep 10 2008 Jesus. So your education department is too cheap to buy you a pc and a litepro as well? I mean that's why MS Powerpoint was made.
Gawd.-- Custardguts, Sep 11 2008 //I mean that's why MS Powerpoint was made// Yes, the $200 piece of software to complement the $1000 laptop and the $4000 projector, to make the $.50 piece of plastic paper obsolete.-- FlyingToaster, Sep 11 2008 where this is really needed is on the reel to reel OHP's. who is going to clean a semester's worth of lecture off of a 100ft roll? if you could crank it through a set of rollers and reuse it..... nostalgia I'm afraid.-- WcW, Sep 11 2008 The water used for cleaning these will eventually contain all the ink from the transparency sheets, and should therefore be boiled down and used to refill the pens.-- hippo, Sep 11 2008 But how would you separate the colors? Maybe chromatography?
Anyway, I have an idea coming up whose mechanism might be quite adaptable to transparency cleaning, in case anybody still has that need.-- notexactly, Dec 09 2018 Anything is possible; do you have any similar ideas, like a quicker way to de-fluff a Spinning Jenny, or a better design for a chariot harness ?-- 8th of 7, Dec 09 2018 random, halfbakery