Trimmings to Slip?? How to recycle bone dry trimmings to create casting slip
Vložit
- čas přidán 1. 07. 2022
- Here I take bone dry trimmings from previous slip castings and recycle them back into slip to create more pots. These trimmings all came from slip I use to slip cast pots. So while they are bone dry now they once had water and defloculant in them (Darvan 7). To turn these trimmings back into slip I just add water! These trimmings have large chunks so some mechanical persuasion to break them up, therefore give the slay more surface area to absorb water, helps speed along the process. I use piece of dowel to start, and then my drill mixing attachment. On and off over the course of a day I came out and mixed things up. The slip ended up with a great consistency so all of the existing defloculant from the bone dry clay was doing its job again. If the slip was would have been too thick, I would have added more Darvan 7 to loosen it up. By the end of the day I'd converted the trimming back into useable slip and I could slip cast more pots!
TOOLS (affiliate)
- Sieve amzn.to/48pVt0a - Jak na to + styl
Kent! Hope your day is going well! Thanks for posting!
Thanks for watching! Feel free to share it with anyone else that might enjoy it.
Your videos have been really helpful at my first go at slipcasting. My first few attempts are being fired right now!
That's great to hear. Good luck with the firing!
Thanks! I had a whole heap of leftovers and disasters and your video was excellent..followed what you did and made myself new slip, cast and perfect :) Thanks Amanda
That's great to hear!
Thanks so much for making this process simple👍🏽
Glad it was helpful!
Well said and easy to understand , thanks
Glad it was helpful!
Thanks Kent , only just got your message today via a new email address. all good
Great video, Kent! Thank you for explaining the ratios and quantities of your clay and water. I'm new to ceramics, and it was a big help. Would you change your ratios or quantities if you were starting out with clay that had no flocculant? How much flocculant?
The water to clay ratio would be the same. However if there is no deflocculant already, then it will be too thick until it goes in. Just like mixing it up from powdered clay. Also, the clay body is usually different between throwing clay and slip casting clay, just FYI (I didn't realize that at the start). I use Darvan 7 because it is very tolerant to the amount you put in. Now I just pour some in and don't bother measuring. I think I have another video talking about it in more detail, but finding it might take some digging.
I love the video! Could you please tell me what kind of sieve is that one that you use? How many treads it has? When i reclaim my slip always get like a grumpy texture :(
Thanks! It's just a cheap baking sieve - I think it's 60 mesh. I use it mostly to catch large chunks of clay. Is you original clay gorged by any chance? If so, that could be your issue. If not, I'm not sure what might be going on.
What consistency do you look for when making your slip? Should it hold a bit of trace or none at all?
My slip is very runny. It pours like water except for being so much more dense.
What cone porcelain do you use? Have you tried using a.sodium silicate solution?
I'm using stoneware and fire to cone 5/6. Early on I tried sodium silicate but it is much more touchy than darvan, so I switched over to that very rapidly.
Do you use only clay to make your casting slip? Or do you have a particular recipe? Do you mind sharing ?
I use powdered clay designed for slip casting, darvan 7 as my deflocculant, and water. That's all! I have other videos showing my mixing up my slip from fresh clay if you're interested in more detail.
Did you consider checking the SG on your reclaimed slip?
No, I usually just do the water calculation. However if you really want to dial it in you can.
Thanks. Really interesting point that in recycling your clay, it already has some deflocculent in it, so less need to add it to get correct viscosity without excess water.
Exactly. I'm not sure if the darvan 7 breaks down over time or not, but it seems to be ok going through the dehydration and rehydration cycle at least at my scale.
what do you use as the defluculant? Thanks for that video 👏👏😇
I've been using Darvan 7 and it's been working well for me.
@@PotterybyKent Hi Kent, how much Darvan 7 do you add to your slip?😇
I often don't measure - just mix it and add some until it feels right. However I've dug into the darvan 7 data sheets and from that target about 1% relative to the dry weight of the clay. Also, with trimmings that were once slip (like here), they often need way less if any added.
@@PotterybyKent Thank you. 😇🙏
Hi What mesh sieve do you use?
Something pretty corse works - I'm using 20 mesh now.
What micron sieve is that?
Check the comment below which has the answer
What kind of seive is that?
It's this one: amzn.to/48pVt0a
when does this harden?
The plaster sucks the water out of the slip to form the pot. Once the pot is removed from the plaster mold, it is soft like a wheel thrown pot and goes through the same drying cycle.