Short answer: a knockdown stitch is a light grid of stitching sewn first, underneath your design, to press the pile of a fluffy fabric flat so your design sits on top of it instead of sinking into it. Embrilliance calls their tool Knockdown. Mine is called Pile Tamer. They do the same job.
What the stitch actually does
Terry cloth, fleece, minky and sherpa all have a pile — loops or fibers standing up off the base fabric. When you stitch onto them, the thin parts of your design sink down between those fibers and disappear. Nothing has gone wrong with your machine. The fabric is simply standing taller than your stitches.
A knockdown grid is a wide, open layer of stitching sewn before the design runs. It presses the pile down and holds it there, so the rest of the design stitches onto a level surface.
It is not a fill. It should be light and open — enough to hold the fibers down, not so much that you have stitched a solid patch onto someone’s towel.
Why it is called a knockdown
Because it knocks the pile down. The name came from Embrilliance, where the tool is called Knockdown, and enough of the industry picked it up that it became the word people type into Google.
I call mine Pile Tamer, because that is what it does — and because Knockdown is theirs, not mine.
A knockdown is not a topping, and this is the mix-up I see most
Topping is the clear water-soluble film. It goes on top of the fabric, stops stitches sinking as they form, gives you crisper edges, and then washes away.
A knockdown goes underneath your design, stitched into the fabric, and it stays there.
They solve overlapping problems and they are not interchangeable:
- Topping on its own, on a thick bath towel — the design still sinks once the film dissolves.
- Knockdown on its own, on a high pile — the design sits up, but the edges can still look fuzzy.
- Both together, on a thick towel — usually the right answer.
Which fabrics need one
- Terry cloth towels — almost always.
- Fleece and sherpa — usually.
- Minky — yes, and it shifts as well, so hoop it carefully.
- Faux fur — yes.
- Waffle weave — sometimes, and it comes down to the design more than the fabric. A skinny font will drop straight into the weave, so I would use one. Something bold with thick satin will sit on top without any help.
- Flat woven cotton, twill, pique — no. You will only add bulk.
That waffle rule is worth carrying across the whole list: the thinner your lettering, the more likely it needs a knockdown. A heavy block font on fleece can be fine where a fine script on the same piece of fleece disappears completely. Look at the thinnest part of your design, not at the fabric.
How to use one without anybody seeing it
- Match the thread to the fabric, not the design. A knockdown in towel color disappears. A knockdown in the design color becomes a rectangle.
- Keep it open. The temptation is to make it dense enough to be sure. Dense is exactly what makes it visible and stiff.
- Size it a little larger than the design, so no part of the lettering lands on unflattened pile.
- Soften the outline where you can. A shaped or rounded edge reads as part of the design. A hard rectangle reads as a mistake.
How to do it in Unzip2Stitch
Pile Tamer is built in. Open the design, choose Pile Tamer, and it builds the grid underneath, sized to what you are stitching. It is one click, and once you have done it on one towel you will do it on every towel after that.
The short version
If your monogram vanished into a towel, the fix is a light grid stitched first to flatten the pile. Embrilliance calls it Knockdown. I call it Pile Tamer. The one you do not want is neither of them.