Comparing with other pelletizer, underwater is more compacted which is obvious when the output is hug. water bath. The most promising thing I have found is a wood chipper like thishttp://www.amazon.com/Eco-Shredder-ES1600-Electric-Chipper-Shredder/dp/B002U82A3K/ref=pd_sbs_ol_2 But what is really needed is a small version of expensive industrial grinders. Apart from carrying water, these plastic bottles have way more uses, they’re a lot handier than you think. Laser Cut Metal Plastic Shredder Kit, works as good as any other industrial plastic shredder, lot of welding, wood work, lathe experience to make the shaft or other pieces, need a laser metal cuter or someone who has one to cut the blades & other metal pieces. Some good examples of this are: http://www.youtube.com/watch?v=btf5YT-VQTM http://www.youtube.com/watch?v=ow-oUyaTgoo I have just made a homemade plastic extruder ( https://www.instructables.com/id/Plastic-injection-molding-and-extruding/ ) so shredding household plastics was going to be my next project. Maybe a food processor? Identifying and monitoring the metrics by product formula reduces waste and takes the guesswork out of setting up an extrusion line. 7 years ago. •  Process-water temperature during operation. Seems the first sensible thing to do before spending more time/energy converting shredded material into something new. This system consists of strand die, water bath, strand pelletizer, centrifugal dewater and vibrating classifier. . They staggered saw blades on an arbor and enclosed it with a housing and a hopper powered with an electric motor. This cools the pellets and transports them via a flexible discharge channel to the to the pellet water removal screen (4). Try a plasma cutter instead, it should be cheaper than a water jet, but yes, the project is not really inexpensive. The melt-filtrated strands are cooled briefly in water and then cut into pellets. A mentor of mine once described the process as “a wringer washer with a lawn mower attached behind.” And while that assessment is partly true, it is not a convenient truth that can be used as an excuse for not making improvements on the production floor. After it passes through the cooling piping (4) the transport water and any fine particles which it may have are removed from the pellets in the pellet water removal screen (5). Compounders that acknowledge those factors and make the necessary investment in time and resources to control them will simply make better pellets than those who do not. Good luck. What kind of coffee grinder did you use? I was thinking about shredding the plastic and recycling this. Yet it matters little to the customer that the science is right, that the thermal and physical properties, strength and performance, and color are spot-on perfect. Easy start-up, fast cleaning when changing over material and automatic self-feeding if strand breaks occur make these systems indispensable. You should be able to find a cheap one at a garage sale. Hmm I wouldf have thought sink garbage disposal unit would do a good job! Over a year later and still searching. It is suitable for certain recipes, such as PVC, LLDPE, high filling masterbatch, degradable masterbatch, HFFR, WPC etc. These guys look like they might be working on one.http://recyclebot.tumblr.com/archive. You can see it at: http://www.jordanreductionsolutions.com/plastic-grinder.html We manufacture all the equipment in Birmingham, Alabama, and offer free testing and demos at our manufacturing plant. They are then conveyed in a stream of air through a transport duct to the silo or bagging station. In fact, the equipment selected is only the beginning and its successful deployment relies upon a consistent and studied approach. 10 months ago. http://filamaker.eu/, I think I have the machine you folks are looking for. I'd like to point out two resources that we have on our web site that deal directly with grinding plastic bottles. Choose 5 7 8 10 15 20 or 25 lbs of smooth, round, odorless, non-toxic, Extra Heavy Poly Pellets for Weighted Blankets & Cornhole Shooting Bags. Does anyone remember the old stand up pencil sharpeners from grade school? The strands are cooled by a laminar flowing film of water and manually adjustable spray nozzles. This system incorporates with single stage extruder. https://www.google.ca/search?q=pencil+sharpener&hl=en&safe=off&client=firefox-a&hs=bof&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=tbsyUd3aBMbJyAGnooHQAg&ved=0CAoQ_AUoAQ&biw=1366&bih=604#imgrc=tjQ8kX1z7dEbBM%3A%3BYrDlRSMaHaO4TM%3Bhttp%253A%252F%252Fupload.wikimedia.org%252Fwikipedia%252Fcommons%252Fe%252Fe3%252FPencil_sharpener_mechanism.jpg%3Bhttp%253A%252F%252Fen.wikipedia.org%252Fwiki%252FFile%253APencil_sharpener_mechanism.jpg%3B3812%3B1396, http://www.google.co.uk/products/catalog?q=coffee+grinder&oe=utf-8&rls=org.mozilla:en-GB:official&client=firefox-a&um=1&ie=UTF-8&cid=9113490192118023734&sa=X&ei=sAOHUKaJOtGA0AXG6YCQCA&ved=0CEwQ8wIwAA, http://www.jordanreductionsolutions.com/blog/recycling-plastic-bottles, http://www.jordanreductionsolutions.com/plastic-grinder.html, http://www.amazon.com/Eco-Shredder-ES1600-Electric-Chipper-Shredder/dp/B002U82A3K/ref=pd_sbs_ol_2.