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Compression guidlines for compressing LDPE
- This topic has 2 replies, 3 voices, and was last updated 3 years ago by
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So using a 100% MacGyver’d wood block compression mold (8″x4″x3″) and c-clamps, I got a block of compressed thermoset after melting some LDPE (melted at 250-270F, no fumes for those concerned) and cranking around on the mold.
A friend is making some steel brick molds and I’m looking into a legit press- possibly hydraulic (any suggestions for NOT the most expensive, will-fit-in-my-workspace, type presses are appreciated). No idea what the molds look like yet and unsure if they will have a overflow well or whatnot.
Question is- what level of compression (PSI?) should I be aiming for to get this LDPE as dense and hard as possible… without breaking anything? I have no idea what sort of pressure I was getting with the C-clamps… as I was unable to measure hahaha.
Also- anyone in Dallas have connects with UTA? I keep hearing about some professor that has been playing with recyclables and I’d like to network with people in the area. Thanks guys! Happy Mad Scientist Monday!!
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this thread has some of the better compression specs that I’ve come across on here. He was working in bars – converted to psi there was still a huge range of what’s considered ‘enough pressure’. We landed somewhere around 5 psi spec, but then when we got to building our little press, I just grabbed a few automotive bottle jacks. You can get a 20 ton bottle jack (massive pressure) for less than $50.
I’m looking to move towards pressing blocks from dirty agricultural LDPE “mulch” films… will be following your progress for sure, and will post when we’ve got something to share! good luck!
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