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From the back of the canvas slide a wedge, point first (top of the triangle), into each slot, one at a time. Give them a tap with a small tack or finishing hammer. Be gentle. Bashing it could split the wood of the wedge, or you could bounce off and hit the back of the canvas, or over-stretching of an oil painting could crack the brittle painted surface. Some artists tap downward with the side of the canvas on the table or floor, some tap upwards. I find upwards to be more difficult to aim, but try both and see which works best for you. Do one corner at a time and try to tap with the same force for each corner so the tension is even. There will be two in each corner, eight per canvas. Check the front of the canvas and if you need to, go around and tap them all again. I find that sometimes one corner is sagging more than the others and it might help to give that one corner a few more taps.
Acrylic paint is made of plastic polymers, water, and sometimes a little salt. The polymer type used in acrylic paint makes it both durable and flexible. This is why it can be easily applied to canvas shoes and allowed to dry.
The plastic polymers in the paint create a thin, flexible coating on the surface of the shoes, making them long-lasting and resistant to scuffing or cracking. The plastic polymers are also durable enough to be applied to canvas shoes without damaging them.
The canvas is prepared with an ink-receptive coating that relies on being somewhat water-sensitive to allow the inks to absorb into it and then dry. If this water-sensitive coating gets printed and not properly sealed, or if moisture comes in from the backside of the canvas as with humid environments, the coating can swell up and develop crazing and cracking. I think this might be more likely than the artist doing this intentionally.
Digital artist and designer Diego Arriagada brings us 18 grungy raster and vector based textures based on photographs. The set includes dry paint, cracks, dirt, cardboard, and moss among others. Arriagada has made these textures available under a Creative Commons 1.0 Universal license.
At 300 DPI and a minimum of 2400px on their longest sides, you'll love this collection of high-quality textures from graphic designer Jesse Nuñez. Includes disstress, grit and grain, grung plastic, ink and cloth, spray paint, and wrinkled paper textures in either PNG or JPG. Available for both personal and commercial projects.
Created by visual artist and made available on Pixel Surplus, this collection of 7 high-quality plastic textures complements the mockup provided above for even more design options. Use in both your personal and commercial projects.
It never hurts to have a little bit of everything. Studio 2am provides just that with an assortment of 25 high-resolution paper, plastic, and tape textures from their full size Texture Collection. Great for mockups, designs, illustrations, and more. Available for personal-use.
Ware shrinks when it driesIn most cases, cracks happen when the shrinkage occurs unevenly enough within a piece to overcome its inherent strength to resist. So, it is not the speed of drying, but the unevenness of drying that results in ware either cracking or harbouring residual stresses. The influence of evenness of drying is well demonstrated by considering that one studio or plant may dry ware in a uniform manner without failure in half the time another is doing it unevenly with high losses.
Ware wants to dry unevenlyExposed sections (like lips of ware) will dry first, and they will pull far ahead of other sections in the race-to-dry. Do what you need to to keep keep drying as even as possible throughout the process. For complicated shapes, certain sections will dry before others no matter how you orient it.Isolate the stage in the process where variations in water content within a piece (drying gradients) are first introducedThis could happen with an early unshielded draft or ware left out too long after forming. Clay in the plastic state easily absorbs stresses created by a 3% spread in water content between the driest and wettest sections of a piece. Once introduced, however, this spread tends to remain throughout the rest of the drying process, and, in later stages weaker and thinner sections can find relief only by cracking.The "nirvana" of continous-drying is a humidity-controlled tunnelThe tunnel is accessible at both ends, the carts push in one end and come out the other. The full heat of the furnace blows near the exit of the tunnel where outside dry air is also introduced. The flow of air proceeds toward the entrance where the lowest heat and maximum humidity are present. Vents along the tunnel are used to introduce outside fresh air or expel humid air, as needed (to fine-tune the process). Ideally, water smoking can be done in the drier.The "nirvana" of batch-drying is a humidity-controlled chamberSurface water is removed from ware by a high-velocity current of damp air in an atmosphere of slowly-declining humidity. The brisk humid draft visits all surfaces removing the same amount of water. The humidity control can be as simple as controlling how much outside dry air is allowed in and damp re-circulating air is allowed out. As a compromise, a special plastic-enclosed area of the studio or plant can create a humidity chamber (the humidity is a natural consequence of enclosing the wet ware). Ware dries much slower, but also more evenly; at the point at which all shrinkage has occurred it can be extracted for final air-drying. Potters and hobbyists can extend this principle by placing ware, on batts, under cloth and plastic. This will slow, and therefore even out, the drying process.Give consideration to each type of piece being driedThink of its special drying needs. In complex or unusual shapes, slow drying sections can be accelerated by a different orientation (e.g. turning bowls over as soon as possible), placement (e.g. putting mugs in circles with handles at the center), or air-flow adjustment or shielding. You can even slow fast-drying sections by application of wax resist or latex at leather-hard stage.Ware needs adequate air-flow, temperature, and time to give up remaining pore water that is not released at room temperature.In the absence of a +100°C drying chamber, your kiln is the final stage batch drier. Electric kilns lack air flow to carry away surface water, consider a kiln-venting system as not only an investment in safety, but in proper drying. Vent or no vent, it is vital to provide a slow heat above boiling point to give opportunity for all pore water to escape before firing proceeds. If necessary, program manually to hold at 240F for many hours (or even days) before continued the firing. Although it might seem that temperatures higher than 212°F boiling-point would create steam that could fracture ware, this is not the case (that is why we hold at 240°F).Highly-grogged clays of low plasticity have superior drying propertiesThis is not only because of the obvious lower drying shrinkage, but because water-permeability is better and the grog creates extra pathways for water expulsion. In addition, the grog particles act to terminate cracks in their early microscopic stage.Drying difficulty increases exponentially with ware size and weightDo not underestimate the escalation of problems in drying ware that is larger than what has been made in the past. While 10-inch plates may have presented few problems for years, going to the production a 12-inch size could multiply drying loses tenfold. Some shapes of widely-varying thicknesses and angular contours are particularly difficult. Large plates, especially porcelain ones, can be a real challenge. Be mindful of the influence of shape and contour on the incidence of drying cracks.Don't underestimate the effects of climate and weather changes on drying patternsWatch out for long, cold, damp periods that culminate in a dry spell, especially if the conditions have encouraged you or your workers to get sloppy. Cold winter months can mean low humidity. Adjust your methods or make the drying environment as independent of these changes as possible.Clay is composed of microscopic flat crystalsWhen they are randomly oriented in the plastic state, shrinkage is the same in all directions and no stress occurs during uniform drying. However, when they align, shrinkage is less along their length than width. So cracking can occur even if drying is even. Particle orientation across the bottoms of wide thrown pieces, for example, tends to be more random than up the walls. So if you are hand throwing such ware, compress the bottom to try to line them up parallel to the surface to reduce stress during drying. Consider also how your forming equipment might be aligning particles in an uneven way.Materials in the bodyIt is possible that the cause of cracking can be traced to a body that is too sensitive to material changes, or a material change has affected a normally stable body. You may need to respond to such changes with a recipe adjustment. On the other hand, don't be too quick to blame the body either, if a sanitary ware manufacturer can dry a 50 pound porcelain toilet and you are having trouble with a 2 pound stoneware plate, there is a good chance your process could be adjusted to solve the problem! If your body contains bentonite, for example, you could safely reduce it by 1 or 2 percent without having any impact on fired properties. This will increase permeability (so water can escape faster) and it will reduce shrinkage. Another approach is to exchange some of the ball clay for a less plastic type of ball clay (or kaolin for a less plastic kaolin). The lower plasticity means it won't form quite as well, however it might be easier to adapt to a plasticity loss than deal with drying cracks. When doing the above adjustments, watch for changes in body maturity and adjust with a slight drop or increase in feldspar. One more point: don't trust other peoples' opinions about which kaolins and ball clays are more and less plastic, do drying shrinkage tests yourself to confirm.Be Realistic when using porcelainDo not expect a porcelain to dry as well as a stoneware or earthenware. Do not expect to be able to make any kind of shape and size using a porcelaneous body. If ware has differing thicknesses along its cross section and has angular contours then a porcelain may not be practical. That-being-said, while industry cannot afford to have time or labor-consuming drying scenarios, individual potters can nurse finicky clay bodies through drying. For example, porcelains can lose water very quickly (and therefore shrink a lot) during early minutes and hours of drying, it might be possible to successfully dry otherwise troublesome pieces by covering them quickly after forming, leaving them for days if needed, to slowly descend through initial drying.An effective way to test and rate drying performance is valuableSome labs have complex instruments and generate tons of numbers and reports but if you ask them to talk about a clay material's drying performance they can be at a loss for words! Knowing particle surface area, particle size, shrinkage, etc. are all fine, but drying performance is a complex dynamic that also involves particle shape, interactions, identity and the nature of particle-particle and particle-water interactions. The DFAC test (Drying Factor) is easy-to-do and produces real values that represent this property.ConclusionTake cracked ware seriously, even a few pieces can betray your flawed process, it could be just luck that has spared the rest. Pretest new or new batches of clay. The drying process is not really a black art. Just work toward the goal of being able to pick up a piece of ware at any stage of drying with confidence that water content tests taken anywhere on the piece will yield similar results. 2b1af7f3a8