Hmmm yes unusually low yield. Hard to tell without seeing the kief in question. For the most part all my lower grade no melt kief yields an average of 50%.
Have you tried bumping up the temps? 180, 200, and 220 are my go to temps for initial experiments and then I dial it in after that with each particular strain or material type. I'd try one at 200F then 220F. I never ever go over 220F
I think you mean an ounce of rosin from a pound of trim?
My trim is very high quality because I spend the time and money doing a really good job of big leafing. As a result I usually average 15%+ in kief. I've had as low as 12% and as high as 23%. There's a lot of technique in tumbling alone. I could probably write a few thousand words on that alone, but not right now lol. If I don't get atleast 15% kief in weight of the trim, I get pissed lol.
I seperate 3 grades as I tumble. The first 3-5 minutes or so which is usually melty dependant on strain that yields around 75% rosin from the weight of the kief. Then the next is like another 15 to 30 minutes wich is either barely melt or clean looking no melt which usually gives me around 60% return and is the bulk of the material. The last grade is another 30 minutes to an hour (sometimes I've done as long as 2 hours total) and it's always no melt and pretty full of hairs and a bit green and yields around 40%-50% and considerably darker rosin but still tasty.
The barrel dimensions, how much is loaded (always go for half full) the rotation speed, how dry and cold the trim is, strain, how the trimming was performed, how the trim was stored, all are factors in the quality and return of the kief from the trim.
In average, iD say if one gets a 10% return of rosin, off the original weight of the trim, that's pretty good.
Every extraction type or method will have different elements that appeal to different people. It's a fallacy that one method is superior. From a subjective perspective that may be true to ones personal ideals but not from am objective perspective. If people want to see 20% yields from trim with decent speed of processing, they are going to need to drop 20k on a cls and ovens (that's what I had done before rosin came about). Rosin isn't the most efficient from a percentage of return perspective but it is very efficient as far as investment, safety, and ease of use is concerned. Every extraction method trades certain elements to gain others.
If you are having a hard time with dry sifting or tumbling, try washing the trim and making bubble. An 8 bag set makes it easier to seperate grades and you'll most certainly get a higher return in hash from the trim. However you then have to deep with all the water and ice and technique involved with that realm. Then there's the process of drying it properly in a cold room. This is why, for production, I prefer just dry tumbling and keeping it dry through the whole process. One can always save the trim, after tumbling, for an ethanol wash, to get the remaining goods out. You can put together a poor man's rotovap and make RSO to give away or consume or distribute to patients as well. I put together this 5 liter setup for like 700 dollars. Mag stir hot plate, boiling flask, 500ml leibig, and no receiving flask. Just use the glass jugs the ever clear comes in, save more money.
Right on man, appreciate your input!
The shake I been getting is some killer cherry pie shake, but they dont clean all the water leaves out very good, so I think thats whats effecting my yeilds.
I usually freeze it and crush it up, then put around a qp in the tumble now for half an hour in a cold room right next to the window ac. I think I also need to clean up my tumble screen and maybe tighten it, I learned my lesson running it a hot ass room one time n think it still needs cleaned from that day.
Im wondering, when making the rosin, if I been pre-pressing it too hard. I been pre pressing to about 3 tons or 750 psi, I wonder if Im making it too solid for it to fully extract. My next try Ima take it down to 600 lbs from the dewalt press on the pre press mold n see if that make a difference. For now Im out of keef tho. I probably shouldnt of been learning on larger amounts like i did, one blowout set me back a good 5-6 grams.
On another note, I pressed up 26 grams of remoistened trim, some pretty crystally stuff of my own, n came out with 1.8 grams. that would equal 31 g/p.