FAQ
Oval screen printing machine selection, operation, maintenance and troubleshooting — answered.
Parameters depend on the specific product. Speed: small runs or fine artwork prefer medium-low speed (300–500 pcs/h); simple large orders can run above 800 pcs/h. Squeegee pressure needs balance — too heavy causes ink bleeding, too light reduces adhesion. Ink volume depends on mesh count and ink type: water-based needs slightly more, plastisol slightly less. Start from the manual's baseline and fine-tune via test prints.
First zero all print heads (most control panels have a reset option). Then print the first color on a test substrate with alignment marks (e.g. crosshairs) and adjust the X/Y knobs of the other heads until marks line up perfectly. Print a sample after each tweak. Newer machines may offer laser-assisted positioning; older ones rely on patience and a good eye. Precision is everything.
First zero all print heads (most control panels have a reset option). Then print the first color on a test substrate with alignment marks (e.g. crosshairs) and adjust the X/Y knobs of the other heads until marks line up perfectly. Print a sample after each tweak. Newer machines may offer laser-assisted positioning; older ones rely on patience and a good eye. Precision is everything.
Choice depends on the order and budget. Water-based: eco-friendly, soft hand feel, ideal for cotton tees but slower to cure. Plastisol: industry standard, vivid colors, durable, fast cure, fits most fabrics. Silicone: best for sportswear — highly elastic and adhesive. Specialty inks include glow-in-the-dark, metallic and puff. Always check ink compatibility with screens and curing equipment, and review the MSDS.
Polyester mesh is the cost-effective default — strong and durable. Stainless steel offers premium precision at higher cost. Mesh count depends on artwork and ink: high mesh (200–300) for fine detail and halftones; low mesh (80–120) for solid blocks or thick inks. Water-based prefers low mesh; plastisol is more flexible. Ask your supplier for the optimal spec per job.
Each fabric behaves differently. Cotton: absorbs ink well, suits water-based or plastisol, cure around 160°C. Polyester: prone to dye migration — use low-bleed plastisol, pre-heat the pallet to prevent shrinkage, cure below 150°C. Blends (e.g. 50/50): use universal inks and run an adhesion test first. Stretch fabrics (nylon, spandex): silicone ink is recommended with gentle cure to preserve elasticity. Always test print when switching fabrics.
Keep it clean to stop small issues becoming big ones. Daily: wipe heads and belt, remove ink residue (use dedicated cleaner — alcohol can damage parts); wash screens immediately after use. Weekly: inspect pallets and squeegees for wear; clean curing-unit filters. Monthly: deep clean the whole machine, lubricate moving parts (correct oil per the manual). Increase frequency in peak season.
Screens: thoroughly washed, lay flat to dry, store in a cool, dust-free, dark place — they'll last over a year if treated well. Don't stack too high or frames warp. Inks: sealed, in a cool ventilated area (15–24°C is best). Water-based has a short shelf life — use quickly; plastisol lasts longer but stir well before use. Label every can with the open date to avoid mix-ups. Smart storage saves money.
Treat maintenance like the machine's health check. Monthly: belt tension and alignment — tighten if loose, correct if drifting; inspect pneumatic/hydraulic systems on heads for leaks or low pressure; check squeegee and frame wear; clean sensors and wiring to avoid false alarms. Quarterly: lubricate bearings and rails; test curing-unit heater stability. Keep a log of every action — it can save you in a crisis.
Blur causes: ink too thin (add thickener), mesh too low (go higher), squeegee pressure too high (reduce), or clogged screen (clean immediately). Misregistration is usually a calibration issue — check head and pallet positioning systems, ensure the belt isn't slipping. If the substrate shifts (e.g. T-shirt wrinkles), use spray adhesive or jigs. Inspect test prints carefully — catching issues early saves material.
