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| Author | Topic: water cooling of pvc extruder |
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Jeff Uguccini Member Posts: 2 |
posted June 06, 2003 09:16 AM
   
I am trying to find out the required water flows and delta T's to cool 2", 2-1/2", 3-1/2" and 4-1/2" extruders. The units are HPM. I have a 2-1/2" and a 4-1/2" working together. The Mfr rep I spoke to told me 25gpm and 35 gpm respectively of 80F water with a 10deg delta T. This equates to 25 tons. The unit is served with a 1" line. No way 60 gpm thru a 1" line. I plan to cool the units with 45deg chilled water same as being used to cool the water baths which cool the product. I also intend to close the chilled water system by installing plate coils in the water baths.The owner has no data sheets on any of his equip. Naturally. Any help would be appreciated. IP: Logged |
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Steve H Moderator Posts: 190 |
posted June 10, 2003 12:31 AM
G'day Jeff The specific amount of cooling depends on the process (pipe/sheet/blown film/profile) How the extruder is cooled (air/water) The amount of material being processed per hour For PVC, a rough rule of thumb, 80lb/hr requires 1 ton cooling capacity. Add to that barrel cooling requirement, again a rule of thumb, 1 ton per inch of screw diameter. Steve H IP: Logged |
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Jeff Uguccini Member Posts: 2 |
posted June 10, 2003 08:04 AM
Thanks much Steve. My customer is extruding side and bumper moldings for cars and trucks. All the machines are water cooled.The following are the capacities for the machines: 2"-180lbs/hr 2-1/2"-240lbs/hr 3-1/2"-380lbs/hr 4-1/2"-520lbs/hr Again, many thanks. The rules of thumb are great as I can tweek the systems after they're installed. One other thing. Have you ever seen the cooling tanks cooled using plate coils installed in the tanks? The owner is a little skeptical but I see no reason why it wouldn't work. I've used plate coils on heating applications but never cooling.It was the best idea I could come up with to close the systems to try and keep the crud out of the chillers. I figured to supply 42F water to the coils to maintain the required 45F water in the baths. P.S. Great site! I learned alot. Jeff IP: Logged |
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Steve H Moderator Posts: 190 |
posted June 10, 2003 05:57 PM
Hi Jeff Couple more thoughts on your question, you'll need to allow for cooling the gear box on each line, about 1 ton per 100HP of drive motor. With the feed throat, it pays to maintain a temp of 35C-45C on the casing. Too cold and you can get condenstation on the internal surfaces, too hot and the material sticks to the surfaces and bridges. Can't help with the cooling plate question, but your chap is probably worried about how evenly they'll cool his baths. Any variations in temp will cause problems with his extrudate (warping, stress). Steve H IP: Logged |
for 3" or less 1 ton, for 3.5" and greater 2 ton. So the figures quoted by HPM's rep sound about right.All times are ET (US) | next newest topic | next oldest topic |
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