A print shop puts more into a piece of cotton than almost any other working room. Wiping rags go from white to grey in a week, aprons carry a record of every colour that ran, and the pile in the corner grows faster than anyone plans for. Some of it will wash out completely. Some of it never will, and knowing which is which saves a lot of wasted effort.
The three things on a wiping rag
Ink is the obvious one, and it is not one substance. Water based ink behaves almost like a normal stain. Oil based ink is a different problem entirely, because it is designed to stay where it is put and it does exactly that on cotton.
Press oil and grease make up the second layer, picked up from rollers, bearings and anywhere a hand has been. Oil is what makes a rag feel heavy and slightly slick, and it is the reason a rag stops absorbing long before it looks used up.
Solvent is the third and it changes how the other two behave. A rag that has had solvent on it carries dissolved ink deep in the fibre rather than sitting on the surface, which makes it darker but sometimes easier to move.
Paper dust and lint sit on top of all of that. It is the least troublesome component and the one most likely to end up spread across every other item in the drum.
Sort before anything goes near water
Keep rags with heavy oil based ink separate from everything else, permanently. Those rags will never be white again and putting them in with lighter items just moves grey around instead of removing it.
Run a rag pile of its own. Shop rags, aprons and anything else that lives on the floor should never share a load with clothing, because whatever comes off the rags has to go somewhere.
Sort by colour family where it is practical. A load that was all reds will grey evenly and look acceptable. A load that mixed a strong blue with a strong red will look muddy in a way that never comes out.
Put anything soaked rather than marked into its own group. A rag that is wet with solvent is a different item from a rag with a dry ink mark, and it wants handling before it joins any pile at all.
Solvent, heat and the one rule that matters
Rags carrying wet solvent should never go into a dryer, and they should not sit balled up in a closed bin either. Let them air out flat and open first, somewhere with moving air, until the solvent has gone off.
This is not a technicality. Solvent and heat in an enclosed drum is the one genuinely dangerous combination in this whole routine, and every other decision here is a matter of appearance by comparison.
Once a rag has aired out, it washes like any other heavily oiled cotton and the risk goes with the solvent. The airing step costs a shelf and an hour and removes the problem entirely.
Set a rule in the room rather than relying on judgement. A bin marked for airing, in the open, and a second bin for the wash pile is the whole system and it takes no explaining.
How a print shop should run the wash
Hot water and a full detergent dose. This is one of the few loads where heat is unambiguously right, because heat is what breaks oil loose from cotton and oil is what is holding the ink in place.
Give the load a great deal of room, more than feels sensible. Oily rags packed tight hold their own soil against themselves, and the water that should be carrying the oil away never gets between the layers.
Run a second cycle with detergent but no additions before the rags go in the dryer. The first cycle lifts the bulk, the second carries away what the first one put into suspension, and the difference is obvious on a white rag.
Run an empty hot cycle in the machine afterwards if the load was heavy. Oil deposits in a drum will find their way onto whatever goes in next, and that is a bad surprise on something light coloured.
Aprons, sleeves and the things that get worn
Aprons take the same soil as rags but they are worn, so they need a genuine rinse rather than an approximate one. Detergent left in a heavy cotton apron makes it stiff and it holds every subsequent mark more readily.
Treat the front panel and the pocket area before the wash rather than trusting the cycle to reach them. Those are the two places ink concentrates and the two places a packed drum reaches last.
Wash aprons apart from wiping rags even though the soil is similar. Rags shed lint heavily and aprons collect it, and an apron covered in grey lint looks worse than one with an honest ink mark on it.
Accept that a working apron will show its history. The aim is removing the oil that holds the smell and the grime, not restoring the colour it had when it arrived.
Deciding when a rag is finished
A rag stops being useful when it stops absorbing, and that happens well before it looks worn out. Oil that has built up over many washes fills the fibre, and a saturated rag just moves ink from one place to another.
Test by dropping water onto a folded rag. If it beads or sits for a moment before soaking in, the rag has reached the end of its working life, whatever it looks like.
Keep the retired ones for the jobs where absorbency does not matter, then take them out of the building. Holding on to a full shelf of finished rags is how the good ones become hard to find.
Buying plain heavy cotton and running it in one consistent rotation makes all of this easier. Mixed stock of different weights wears at different rates and the pile never reaches a steady state.
Common questions about print shop
Will ink ever fully wash out of a rag?
Water based ink usually will. Oil based ink generally will not, because it is built to stay put. What washing achieves on an oil based mark is removing the loose pigment and the grease around it, which restores absorbency.
Can oily rags go straight in a dryer?
Not if there is any solvent left in them. Air them flat and open first, with moving air around them, until the solvent has gone off. After a proper hot wash and a second cycle, the remaining oil is no longer an issue.
Why do clean rags feel slick?
Because oil is still in the fibre from previous use, and a cool or crowded cycle will not lift it. Hot water, a full dose and a much looser drum will, and a second wash cycle usually finishes the job.
Should aprons be washed with the rags?
No. The soil is similar but rags shed a great deal of lint and aprons collect it, so an apron washed alongside rags comes out looking worse than it needs to even when it is genuinely clean.
The Temple part
Temple summers are long and hot, and heat thins ink and oil while it is still on a rag. That is useful in one way and awkward in another, because thinned oil spreads further into cotton before it sets.
It also means a rag left in a bin in a warm room goes off faster. The smell is oil turning, not anything else, and it is the reason a pile that sat over a hot weekend is harder work than the same pile washed sooner.
The water here is hard, and hard water works against a heavy oily load. Mineral in the water reduces how well detergent lifts oil, which is another argument for a full dose, a loose drum and a second cycle.
Dry air on the other hand is a real advantage for the airing step. Solvent goes off quickly in a warm dry room, so the shelf that holds rags waiting to be washed does its job faster than it would in a humid climate.
Where to wash a heavy rag load
An oily cotton load needs far more room and far more water than a household machine can give it.
The machines at our self-service laundry on South 31st Street hold the water volume and drum size that a loose oily rag load needs so the grease is carried away rather than pressed back into the cotton.
Our machines and the store are cleaned daily.
Nou wash-dry-fold service covers the everyday laundry.
For general guidance, The American Cleaning Institute publishes a fabric care guide that is a useful cross-check.
The short version
A print shop puts ink, press oil and solvent into the same piece of cotton, and only some of that comes out. Oil based ink is largely permanent, so the real aim is removing the grease that holds pigment and blocks absorbency. Air any solvent soaked rag flat and open before it goes near a machine or a dryer, keep rags away from clothing and aprons away from rags, and sort by colour family so the grey lands evenly. Wash hot with a full dose in a very loose drum, run a second cycle, then run the machine empty afterwards.
WaveMAX Tanp is at 1516 S 31st St B, easy to reach from Temple and the surrounding area. If you have a load that will not fit at home, call us at 254-228-5959.