drmyrtle Posted July 22, 2014 Report Share Posted July 22, 2014 Some who has made industrial clay might be able to answer this: doesn't clay that comes out of vastly large mills actually have an extruded pattern in the clay? I'm wondering whether, by not wedging before rolling that the extruded pattern, and therefore a weakness that you can't see, is being maintained through the rolling process. To test this, you could use thesameprocess, but lay the clay perpendicular to the extruded end, so that the extruded planes are layered on top of each other, instead of end to end. Just a thought. Link to comment Share on other sites More sharing options...
Min Posted July 22, 2014 Report Share Posted July 22, 2014 Some who has made industrial clay might be able to answer this: doesn't clay that comes out of vastly large mills actually have an extruded pattern in the clay? I'm wondering whether, by not wedging before rolling that the extruded pattern, and therefore a weakness that you can't see, is being maintained through the rolling process. To test this, you could use thesameprocess, but lay the clay perpendicular to the extruded end, so that the extruded planes are layered on top of each other, instead of end to end. Just a thought. I wondered about this too. Perhaps if the clay was on the dry side when pugged then slab rolled the auger pattern wouldn't necessarily be re-compressed. Link to comment Share on other sites More sharing options...
Chris Campbell Posted July 23, 2014 Report Share Posted July 23, 2014 I was just reading Dave Finkeinburg's article on firing in the February '14 edition of Ceramics Monthly and he says that if a crack occurs during the heating part of the kiln cycle the edge will be "somewhat to very much rounded". Cooling cracks are the jagged ones. So, maybe this occurred due to uneven heating rather than cooling. They were stacked so the centers would have stayed cool longer than the outside surfaces which were heating up??? If this could be so, then I would definitely not stack them again! Personally, I have never had good luck stacking tiles ... easier to fire them on their sides. Link to comment Share on other sites More sharing options...
JoLinDesigns Posted July 25, 2014 Author Report Share Posted July 25, 2014 I just realized I did not plug any peepholes. Would this have caused this breakage? Uugh!! I feel like an idiot!!! Link to comment Share on other sites More sharing options...
JoLinDesigns Posted July 25, 2014 Author Report Share Posted July 25, 2014 Here's another that broke. It was on the middle shelf and on the bottom of 4 tiles. I did carve out lines on the backs for better adhesion of the grout also. Link to comment Share on other sites More sharing options...
JoLinDesigns Posted July 25, 2014 Author Report Share Posted July 25, 2014 Link to comment Share on other sites More sharing options...
Babs Posted July 26, 2014 Report Share Posted July 26, 2014 How big are these tiles?? Looks like they take up the whole shelf. If this is the case you should be firing them vertically or on supports with supports between each tile I think. Link to comment Share on other sites More sharing options...
Guest JBaymore Posted July 26, 2014 Report Share Posted July 26, 2014 Chris, The comments from Dave relate to pieces with glze on them, I think. If the glass is sort opf rounded/pulled away from the crack (or flowed into it), then the crack was there before the glaze started to fuse. If the crack goes hard-edged thru the melted glaze layer clean... then it happened on the cooling cycle. best, .......................john Link to comment Share on other sites More sharing options...
JoLinDesigns Posted July 27, 2014 Author Report Share Posted July 27, 2014 I want to thank everyone for their help with my tile issues. I successfully fired a small load of glazed tiles. I feel like I still need to tweak the color outcome a bit But at least they didn't come out warped or broken!!! Have a lot more to do, but I do feel like I am finally moving forward in a positive direction. Thank you all so much Linda Link to comment Share on other sites More sharing options...
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