Plugged Dots

Plugged dots start as a math problem. A 75% shadow dot leaves only a quarter of its cell open, and shirt printing routinely adds 15-25 points of gain between film, stencil, squeegee, and the fibers of the garment. Push 75% through that chain and it lands at 90-100%: the gaps bridge, the dots fuse, the shadow becomes a slab. Fine line counts accelerate it, because at 65 LPI each dot is physically smaller, so the same 30-micron spread eats a far larger share of the open space. Emulsion under 15 microns over mesh, a 60-durometer squeegee, and a 110 mesh all pile on ink and finish the job.

Buyers meet plugged dots as the print that looked stunning on the digital mockup and came back as a silhouette. Dark hair merges with a dark jacket, the folds in a black hoodie vanish, and a photograph turns into a logo. We've eaten 400 tees on a band portrait where the singer's hair, guitar, and background fused into one continuous mass. The face read fine. Everything below the chin was a hole.

Pros cap the shadow end before it reaches the press: nothing above 80-85% in the separation, so the gain has somewhere to go. Then they control deposit with 230 to 305 mesh on the dark channels, a 70-durometer blade, a sharp edge, low off-contact, and one pass instead of two. The trade is that a capped shadow never prints as dense pure black, so a spot black often gets added back on its own screen.

The misconception worth killing is that plugged dots are fixed by adding contrast to the artwork. Darkening the image pushes more tone into the zone that plugs. The correction runs the other way: open the shadows in the file, cap the dots, and let ink gain fill them back in on press.