Web notes
Soft Start
A practical note on soft start, with reduced-speed commissioning steps that help crews settle ink, tension and register properly.
A press start-up should not begin with guesswork. Soft Start is our note on bringing CI, narrow-web, and stack flexo presses into production with checks that reduce waste at the beginning of a run.
Soft Start is written for the first metres of a restart, when ink, tension and register are still moving. The note deals with reduced-speed checks on packaging presses used in Gauteng, KZN and the Western Cape, where heat, dust, humidity and power interruptions can change start-up behaviour. If this topic applies to your line, use the contact form and name the press type, substrate and current fault clearly.
Checks before first web movement
- Air, power and guards checked
- Photo of unwind, print deck, rewind
- Current recipe or job reference listed
- Operator, fitter or shift lead named
Read this note alongside the press pages for CI, narrow-web and stack layouts. Soft Start covers the order of checks at low speed, while the machine pages show how each press path is arranged. That keeps the discussion on actual controls, dryers and web handling points.
How Soft Start works on stack flexo press start-up
Soft Start focuses on bringing a press up carefully after installation, maintenance, or a long stop. Reduced-speed checks help crews settle ink flow, web tension, dryer balance, and register before production pace increases.
Begin with substrate, ink system and target speed, not with production pressure. Film, paper and board react differently during acceleration, and solvent or water-based work changes dryer balance and viscosity control. In Johannesburg, Durban and Cape Town plants, local power quality and ambient conditions often decide how slowly the first ramp-up should happen.
Keep the first start-up record at the press, not in memory. Note web tension, dryer set points, impression settings and register corrections from the first approved job after installation, service work or a long stop. That sheet helps the next crew avoid wasting material while they chase the same settings again.
What Soft Start leaves with crew
The note gives a running order for reduced-speed commissioning, plus check points for ink flow, dryer response, tension stability and register hold. It also identifies what to watch as pace increases on CI, narrow-web or stack equipment. One written start-up routine is more useful on shift than scattered verbal instructions.
Use Soft Start with the matching machine information before changing several settings at once. If a Bellville reference is relevant to your press file, compare it with the actual deck layout, unwind direction and dryer arrangement on site.
- Low-speed sequence matched to press type
- First register corrections written down
- Crew notes kept with job pack
Start-up conditions on local plants
A restart in an inland plant does not behave like one near the coast. Dust around sensors, older factory power, compressed-air quality and shift handover gaps all affect how a flexo press settles during the first run. Soft Start separates urgent running faults from normal commissioning adjustments so crews do not change everything at once.
Near the coast, moisture and salt in the air can shorten cleaning intervals and affect drying balance on film work. Inland plants often deal with dust around guides, sensors, and unwind sections, so soft start checks should include web path cleanliness before speed increases. During load-shedding or unstable power periods, crews need to re-check heater status, tension settings, and register after any interruption.
Operated by Astros Marketing (Pty) Ltd from 2 Makro Place, Sunnyrock 1401.
Soft Start briefing points
A practical note on soft start, with reduced-speed commissioning steps that help crews settle ink, tension and register properly.
Record the counter reading, approved sample and active settings on the day the press settles. Store the note with the job record, service paperwork and layout reference so the next restart begins from known values. For buyers and production managers, that creates one clear file tied to the actual machine condition.