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Step 2: Add oil, and stew.

It doesn't really matter what polyethylene you use, you can melt HDPE plastic bottles in too, if you want.

That is, Resin Identification Code #2 and #4 are both good.

Polyethylene Terephthalate, that is PETE/PET or #1, may also work.

EDIT: Thanks to reader concern, I will state what may not be obvious from the pictures: there are no fumes. There's no smoke, no fans, no inhalation hazard. If there's smoke or fumes, you're doing something wrong and you're burning the plastic. That's why you use oil for temperature regulation.

The plastic bags do this alive-shrinky thing that looks really neat, so I took a video!


<p>I have no Plastic Smithing experience but need some help/guidance. I'm an ice hockey player that has a permanent wrist injury/condition that makes it extremely difficult for me to hold my hockey stick correctly without pain. I'd like to construct a special custom made ergonomic insert/stick end that will allow me to play without pain. I'm not sure how to go about this (don't know if HDPE would be strong enough?). I found a photo (picture attached) of a hockey end-plug/stick-end that is no longer made or in circulation(off the market for like 10 years)....was thinking I could make something out of plastic that's strong like this (and has a few minor design alterations to suit my needs) - I might be able to start playing some serious hockey once again. Any advice/instructions/suggestions would be highly appreciated. Thank you :)</p>
<p>If I wanted to make something like that I'd just 3d print it. More expensive, but a lot less hassle.</p><p>HDPE is pretty strong. That said, if you wanted to reinforce it you could try melting loose glass fibers into it.</p>
<p>do you know where to get use of a 3D printer?</p>
<p>Go to Shapeways.com they will make anything. You can design it or buy something that someone else had already made. </p>
<p>Try InstaMorph thermoplastic pellets. It acts like clay when heated in hot water, but when it cools, it's a strong plastic. It can be shaped by hand when warm or filed, sawed and drilled when cool. More <a href="https://www.instamorph.com/" rel="nofollow">HERE</a> Perhaps plastic bags can be used this way as well but maybe too hot to handle when heated enough to be soft?</p>
You might want to mold a folding stock that attached to the stick for a brace for your wrist a twisted cane shape would suffice. I don't recommend burning all this polyethylene real harmful to you and the ozone. Just save poly bags and take back to store
<p>As the guy says in the article, you shouldn't be burning it. There should be no fumes. Your goal is to use low heat to melt it without creating any fumes.</p>
<p>Genius! I am very impressed!</p>
I find it easier to add 40 to the temperature either Fahrenheit or Celsius and then either multiply by 5/9 if going from larger number (Fahrenheit) to smaller number (Celcius). Then subtract the 40.<br><br>If going from Celsius to Fahrenheit do the same thing except multiply by 9/5. <br><br>Celsius to Fahrenheit is particularly easy since I just round off the Celsius temperature to a multiple of 5. <br><br>Add 40, multiply, subtract 40<br><br>
<p>Just a note, 248&deg;F (fahrenheit) equals to 120&deg;C (celsius).</p><p>Google told me that (https://www.google.com.br/search?q=248+F+in+celsius&amp;gws_rd=ssl)</p>
<p>My old conversion math say Fahrenheit to Celsius is 5/9 minus 32. So 105 deg. Celsius?</p>
<p>When going from F to C you have to subtract the 32 first then multiply by 5/9.</p><p>120 is correct</p><p> &deg;C <br> x 9/5 + 32 = &deg;F</p><p><br> (&deg;F - 32) <br>x 5/9 = &deg;C</p>
<p>I LOVE that you know that. The other night at Willy Wonka rehearsal, one line Wonka says is that Augustus &quot;...will be heated to 88 degrees Fahrenheit...or it is Celsius? I always get the two confused, often with disastrous results.&quot; The director asked if anybody knew how hot 88 degrees Celsius was in Fahrenheit. I wanted to raise my hand (at age 47) and say, I cannot do it in my head, but it is equal to 88 times 9, divided by 5, plus 32. :-) Of all the things I learned from Mr. Stone in 4th grade science class, the F to C and C to F conversion formulae have served me the best all these years! CHEERS!</p>
<p>Thanks for the correction.</p>
<p>i was thinking i could make a mold of an intake pipe for my car out of chicken wire (about 2 feet long, 3 inches wide), then wrap many plastic bags around it, then put it in the oven and melt them together. Would they adhere? would they kind of become liquidy and collect on the bottom?</p>
<p>A student at my institution is doing a project on recycling plastic, and he was heating it in a pot until it caught alight, producing fumes and essentially burning the plastic. I was sure that this is not the way to go about recycling the stuff. This was just a few days ago, and then I received your instructable today :-) I promptly made it in my kitchen, and showed it to the guy. He was utterly impressed :-P Im did not take any pics, unfortunately</p>
<p>I bought a used pyrex casserole dish at goodwill for $2 and melted some milk jugs with a heat gun. when it cools down the block falls out. I read in another instructable that a toaster oven set at 375 works perfect no messy oils. I am waiting for colder weather to give the toaster oven a try. If you press down hard on the melted plastic, it will sick to the glass unitil it cools down</p>
<p>So I had a thought here. What would the results be if you used a toaster oven to heat a pan partially filled with plastic to 250 degrees. Would the results be liquid enough to cast?</p>
<p>Plastic does not melt like metal, it can't cast, instead you force it (inject) into a mold. Or you can spread over a one side mold too.</p>
I don't know about that temperature, but I have seen on YouTube a toaster oven used for this.
<p>I tried melting a block of polyethylene in an oven today. There was a lot of smoke and the outside was starting to brown The polyethylene had softened (and gone transparent) but was not at all melted. There's a chance that the smoke was at least in part from paraffin left over on the tray from the last thing I melted, but that wouldn't explain the browning. Is it normal for the polyethylene to do this? I'm surprised I didn't get any melt at all.... maybe it needed more time, but with the smoke and browning, I didn't want to risk a fire.</p><p>Is the oil how you prevented smoking/browning, aka keeping it away from oxygen? Does it just melt at the bottom of the oil? How do you separate the polyethylene from the oil? Can you just pour it off? My purpose of melting it is to coat some aluminum tube segments. </p><p>I could always try melting it in a microwave (in a glass jar), but I only have one microwave and don't want to ruin it... I tried setting things up to melt it with an acetylene torch outside but couldn't find a lighter that worked, and didn't have the nenn to go to a store and pick up a new one :&THORN;</p>
<p>Just an update... I tried it in a pan on the stove, with a layer of oil over it. First I tried motor oil, thinking that it'd be a lower risk of burning, but it very quickly started giving off a bad smell, so I wiped up what I could and replaced it with cooking oil. I've hit a point where it's not melted, but I'm not comfortable turning up the temperature any more because of the amount of plastic (or residual motor oil?) smelling smoke coming off of it. So again no luck :(</p>
<p>Okay, it gets weirder. Now that it's cooled I could check each individual component. The smell seems to be coming from the plastic, not the oil. The oil just smells like used cooking oil. However, the oil does not *look* like normal used cooking oil, it looks... don't know how to describe it, &quot;partly polymerized&quot;? Like, still fluid, but slightly gelled, or containing some slightly gelled material? Yet it's far too cold for polyethylene.</p><p>Not sure what's going on here....</p>
<p>(might just be that the oil was thick to begin with, I don't know)</p>
Could I get opinions on whether or not my idea will work? <br>-Use an induction cooker to heat a pan filled with HDPE material and a little oil to about 250 degrees. Heat and stir until evenly melted. (I think the induction cooker has the means to maintain a steady temperature.)<br>-Make a wooden mold that uses a 2x4 for a bottom and has wooden sides and ends. Line the mold with parchment paper. <br>-Pour (or drop) the melted HDPE into the mold. Lay a piece of parchment paper on top. <br>-Place another 2x4 on top that's the exact same size as opening on the top of the mold. Clamp the top down and allow to cool. <br><br>This should create a solid block of 2x4 HDPE. The length will be limited by how much HDPE I can melt at one time. I'm hoping I can create 2x4 lumber and build a small bench. <br>
<p>There are mold release waxes that you can apply to your forms.</p>
<p>Strictly speaking, wouldn't the oil be unnecessary (except as a thermometer)? I don't expect it'd ruin anything, though. Wood and parchment paper catch fire at 300F and 400F respectively, so should be no surprises there. </p><p>As for the mold, your plan has you creating essentially a square tube. It could be challenging to make the fit perfectly tight with zero bowing along a void for a full 8' 2x4, but I also don't think a perfect fit would be necessary. I think the bigger potential source of problems would be in lining this tube with parchment paper. Just getting it in would be one challenge; you could possibly wrap the parchment paper around a clean 2x4, insert the lumber and then remove it, leaving only the paper lining. But even then, you would need to arrange the parchment paper in such a way that it can't pop out and stick out into the void; you don't want the paper to get caught on the plastic, folding up <br>and crumpling and pressing marks into your final product.</p><p>I think a safer way to ensure a smooth final product would be to make a mold that opens up along the length of the 2x4, instead of just at the ends. This would make it easier to work with the parchment paper liner: you'd just clamp a flat lid over it all once the mold is full. I admit, though, that such a system wouldn't have as much flexibility to account for varying amounts of plastic. It might be possible to make the mold extendible by building it a bit like a pinewood derby car track: long and shallow, with one of its ends (the &quot;car&quot;) movable so that the void can be lengthened or shortened as needed.</p>
<p>Is there any <strong>risk</strong> in making this? </p>
<p>Ok so how will I know exactly what type of plastic the bags are made of? Is there a symbol to look for or what?</p><p>Thanks :)</p>
<p>Most plastic bags are polyethylene, high-density in the case of lightweight grocery bags, and low-density in the case of heavier department store bags (yes, you read that right...).</p><p><a href="http://recyclingnearyou.com.au/documents/doc-716-plastic-bags-factsheet.pdf" rel="nofollow">http://recyclingnearyou.com.au/documents/doc-716-p...</a></p><p>For other plastics, you probably already recognize the resin identification code, the little number inside the recycling symbol. Wikipedia gives the list:</p><p><a href="https://en.wikipedia.org/wiki/Plastic_recycling#Plastic_identification_code" rel="nofollow">https://en.wikipedia.org/wiki/Plastic_recycling#Pl...</a></p>
<p>Thank you :)</p>
<p>How would you die this material for making lumber. I guess you could make a lumber form and pour/place/pack the material in the form. People have said the material should be pressurized while drying. Guess you could use bricks or something else for this purpose? At any rate, here is a link to making plastic lumber.</p><p>http://www.prosalesmagazine.com/products/decking/how-to-make-plastic-wood_o</p>
<p>to color this material any powder based pigment will work one excellent source i have used was powdered charcoal what i did was i used milk jug plastic than melted the plastic down kneaded in the charcoal into the melted plastic using silicon gloves than clamped it down into a mold the result was a completely uniform black colored piece of plastic that was also uv resistant due to the charcoal</p>
<p>use an oven set to 350, on a cookie sheet with wax paper to melt the plastic.</p>
<p>So, it's been a while since I had a Plastics and Ceramics course. If you process it like this, does the plastic remain High Density Polyethylene, or could some of it be degraded into a lower-grade form?</p>
Video not connected. I'm interested.
<p>SWEET!</p>
<p>I like this. Sweet and Simple, or is it Simple and Sweet ? Not sure. But it looks nifty and I have visions of a homemade kayak in my head. (Might start a little smaller :-) Thanks for sharing!</p>
<p>Here's a video of a different method that uses bottles, seems less messy, and won't require ruining pans.. maybe. https://www.youtube.com/watch?v=kUR6_bQLU-E&amp;ab_channel=PeterBrown</p>
Peter Brown's shop time for the win!!
<p>Would the end product be toxic to animals? I was thinking about making a wading pool for my turtle.</p>
No it should be fine because HDPE is non-toxic in small quantities. That's why the FDA allows milk cartons, water jugs, container lids, and coffee cans to be made with it.
<p>Most supermarket bags are HDPE. Some stores like electronics, clothing etc use LDPE because they are softer and feel more &quot;luxurious&quot; but still all are made out of PE. PE along with PP are considered the safest plastics for food containers (milk bottles, tupperware etc), so it's safe for water also.</p><p>The general idea is identical (except of the absence of pressure) to the one in a plastic recycling factory. Just take care they are clean and better without prints. Colored are just fine as natural.</p><p>If you are still concerned take some glass and silicone and you have the safest result :P</p>
<p>Without industrial controls, there's no certainty of what hydrocarbons or other stuff may be present in the material or produced in the process. You can't know what machine oils, cleaners, inks, etc. were used in making the original product, much less what it's been exposed to since. Imho, I would avoid any use that involves food or water for plants or animals, humans included. Especially if there's heat involved. Though Bpa is falling from use in many plastics, it's still common, and now we're learning that the replacement bisphenols may be just as bad :/</p>
<p>I would not advise it. You cannot use a vinyl pool liner for a fish pond as it contain chemicals to retard algae. Those bags may be coming from many different manufacturers with many different compositions.</p>
<p>thank you</p>
<p>Hmmm, I wonder how this could be implemented into construction</p>
<p>Our municipality (Moreland, Victoria, Australia) has used it for making park benches, car-parking wheelstops and bollards. They worked with a local plastics recycler and are able to accept a much wider range of plastics for recycling - including plastic bags - than most municipalities in the State.</p>
<p>Looks good!<br>Here's a similar Instructable giving a method of making machinists wax by melting plastic bags. Hope this helps somebody!</p><p>http://www.instructables.com/id/Machinable-Wax/</p>
<p>define &quot;lumber&quot; for me?</p>

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