A Story From the Field: A Temple Banner Order Due Next Week

Thanakorn runs a print and sign shop in a shophouse on a small lane off Charoen Krung Road in Bang Kho Laem. His shop handles everything from business cards, flyers and stickers to large vinyl banners for shopfronts, ordination ceremonies, weddings and merit-making events at temples in the riverside communities nearby. The ground floor holds the counter, a room with a wide-format inkjet printer, a laminator and a cutting table. The back room is the stockroom, filled with reams of paper, glossy art paper, rolls of sticker media and dozens of rolls of banner vinyl.

In October 2026, heavy rain combined with a high Chao Phraya River pushed water into the lane. It came into the shop about a hand-span deep and sat there for several days. Thanakorn and his two staff lifted the printers onto wooden platforms in time, but they could not save everything. Boxes of paper sitting on the floor, vinyl rolls standing upright against the wall and spare ink cartridges stored under the table all spent days in the water.

When the water finally receded and he rolled up the shutter, the smell that came out was a mix of damp, wet paper and mud. The bottom reams had swollen into solid blocks. The reams higher up looked dry at first glance, but when he pulled them out they felt cool and damp, and tiny black dots were already forming along the edges. The ends of the vinyl rolls that had touched the water had grey-green stains, and the cardboard cores of the sticker rolls had gone soft and crumbly. A brown water line ran along the stockroom walls, and a thin layer of mud coated the floor under the shelves.

What worried him most were the orders waiting in the queue. A vinyl banner for a kathin robe-offering ceremony at a community temple had to be delivered the following week. A regular restaurant client needed a fresh batch of flyers. And both of his staff had started sneezing every time they stepped into the stockroom. Thanakorn had to decide quickly how to reopen in a way that kept his team safe and made sure no musty smell followed his printed work into customers' hands.

He is far from alone. Small printers, photocopy shops and sign makers across Bang Kho Laem, Wat Phraya Krai, Bang Khlo and the riverside communities outside the flood barriers are facing exactly the same situation.

Why Print Shops and Sign Shops Grow Mold So Quickly

The core materials of the printing trade, including paper, cardboard boxes and roll cores, absorb moisture readily and are made of cellulose, which is an ideal food source for mold. In a closed stockroom, moisture from the floor and walls slowly migrates into paper on the upper shelves, even if the floodwater never reached it. Vinyl may have a plastic face, but its backing and the woven scrim between layers can trap moisture and dirt, especially at the ends of a roll and in the tight layers near the core.

Print shops also tend to be packed. Every square meter is used for stock, and shelves are often pushed right up against walls to save space. That leaves almost no airflow behind the stock, which is exactly where mold thrives after a flood.

Health risks for staff and customers

• Mold spores and the respiratory system. Lifting, shuffling and cutting moldy paper releases spores into the air. Staff with allergies or asthma may sneeze, suffer congestion, cough or feel tightness in the chest.
• Germs from floodwater. Mud left under shelves and on floors may carry bacteria such as E. coli, which can cause diarrhea if they reach the mouth via contaminated hands.
• Leptospirosis. Wear boots and gloves while clearing mud, because the bacteria enter through cuts, and shops full of stacked paper are a favorite hiding place for rats.
• Skin irritation. Handling contaminated paper or vinyl with bare hands can cause itchy rashes.

Damage to the business

Printing lives and dies by deadlines. If a shop stays closed too long or misses a delivery date, regular customers may switch to a competitor immediately. Printing on damp or musty paper also causes practical problems: ink can bleed, sheets can curl and jam the printer, and the musty smell can travel with the finished job to the customer. That damages the shop's reputation directly, on top of the cost of throwing away damaged materials and buying new stock.

There is also the hidden cost of equipment. Wide-format printers, laminators and photocopiers are expensive, and their paper paths, rollers and trays are vulnerable to dust, spores and humidity. Keeping the room clean and dry protects these machines as much as it protects people.

Spots that are easy to overlook

• The back of vinyl and sticker rolls leaning against the wall, where no air moves.
• Beneath printer stands and cutting tables, where thin mud and moisture linger.
• Corrugated cardboard boxes used to store finished jobs, which wick water up from the floor.
• Paper trays and feed slots on printers and photocopiers.
• Air conditioners and exhaust fans in the printer room, which have been drawing in humid air and spores.
• The lowest drawers of filing cabinets holding customer artwork proofs and order forms.

Common Fixes That Shops Try, and Why They Fall Short

Drying paper in the sun and using it anyway. Paper that was soaked in floodwater curls, cockles and usually already has mold growing within its fibers. Sunlight helps it dry, but it does not make it safe or printable to the same standard. Paper that was submerged should be discarded. Paper that stayed dry but sat in the same room still needs to be checked, and the room's humidity and odor dealt with properly.

Wiping vinyl with bleach. Bleach can fade the colors on printed vinyl and does nothing for mold hidden in the inner layers of a roll. It also leaves a chemical smell that customers notice when they unroll a banner.

Running fans in the stockroom. Fans improve air movement, but they also blow spores from moldy paper onto fresh sheets and into the printers themselves, spreading the problem rather than solving it.

Spraying air freshener. Air freshener makes the room smell pleasant for a while, but the musty odor returns within hours. Worse, perfume can be absorbed by the paper you are about to print customer jobs on.

Painting over the walls immediately. If the walls are still damp, new paint will blister and the mold will soon reappear, wasting both money and time.

Each of these steps treats a symptom. What the shop actually needs is to remove contaminated material, disinfect the surfaces that floodwater touched, and treat the air and odor in the room as a whole.

Keep or Discard? A Practical Triage Guide for Print Materials

One of the hardest parts of reopening a print shop is deciding what to save. Throwing away stock feels painful when margins are thin, but printing customer jobs on compromised material usually costs more in reprints and lost trust. The guide below reflects common-sense handling for each material type. When in doubt, the WHD team can help you sort items during the site survey.

• Paper reams that were submerged: discard. Even if they dry flat, the fibers have absorbed contaminated water and mold is likely to grow from the inside.
• Paper reams that stayed dry but were in the same room: inspect the edges and smell each ream. If there are no spots and no odor, move them to a sealed plastic box in a dry area until the room has been treated.
• Corrugated cardboard boxes and roll cores that got wet: discard. Cardboard is very hard to dry fully and is a favorite surface for mold.
• Vinyl rolls with a wet end: unroll the first few meters and inspect. Cut away stained sections if the inner layers are clean and dry; discard the roll if moisture has reached deep into the layers.
• Sticker media and transfer films: the adhesive layer and backing paper absorb moisture easily, so rolls that touched water are usually not worth saving.
• Finished jobs waiting for delivery: check each item. Anything that touched water should be reprinted. Dry items should be moved out of the room before ozone treatment and kept in sealed bags.
• Ink cartridges and bottles: sealed containers can often be wiped clean and disinfected on the outside, but check the labels and contact your ink supplier if packaging was damaged.
• Printers, laminators and cutters: do not switch on equipment that was wet until a technician has inspected it. Electrical safety comes first.
• Customer artwork files and proofs: scan important paper proofs and order forms as soon as possible, and keep digital backups off-site in future.

Sorting materials before the disinfection appointment makes the treatment far more effective, because the remaining room contains only surfaces and items that can genuinely be recovered.

It also helps to photograph damaged stock before throwing it away and to keep a simple list of what was discarded, with approximate quantities. This record is useful when talking to suppliers about replacement orders, when reviewing insurance or relief options, and when planning how much stock to keep on hand in future rainy seasons. Many shop owners find that the flood is a good moment to rethink storage altogether: fewer boxes on the floor, more shelving with airflow, and a smaller buffer of paper kept in sealed containers.

The Solution: Controlled Ozone Treatment Combined with Disinfection Fogging from World Health Disinfection

World Health Disinfection (WHD) offers an ozone treatment service that targets airborne mold spores and breaks down the odor molecules trapped in a paper stockroom, together with a disinfection fogging service using Chemgene HLD4H. The ULV fogger produces fine droplets that reach under shelves, beneath printer stands and into the corners of the room. This combination suits shops that hold large amounts of odor-absorbing material and also have surfaces that need disinfecting after mud has been through.

Step-by-step process for print and sign shops

1. Site survey. The team inspects the printer room, paper stockroom and shopfront, identifies mold and high-humidity areas, and lists printers and electronics that need to be moved or covered.
2. Advice on sorting materials. Paper and boxes that were submerged should be separated and discarded. Keep only materials that stayed dry, and take each vinyl roll with a wet end out for individual inspection.
3. Mud removal and surface cleaning. Shovel out mud, wash the floor and wipe shelves dry before the service day.
4. Printer protection. Switch off and unplug the wide-format inkjet, laminator and photocopier. Cover them completely or move them out of the treatment room, because rubber rollers and seals inside printers can be affected by high ozone concentrations.
5. Disinfection fogging with Chemgene HLD4H. Coverage includes floors, lower walls, shelving, cutting tables and high-touch surfaces. The team does not fog directly onto blank paper intended for customer jobs.
6. Controlled-dose ozone treatment. The room is sealed and treated at a dose based on its size and the volume of material inside. No people, pets or plants may remain in the room during treatment.
7. Ventilation and re-check. Doors and exhaust fans are opened for the period the team specifies. Odor and mold are then checked again, and the team advises on storing materials away from floors and walls.

Why the order of work matters

Treating a stockroom before the damaged paper has been removed is like airing out a room while the source of the smell is still on the shelves. The most effective sequence is always: remove what cannot be saved, clean away the mud, disinfect the surfaces, then use ozone to deal with the air and the residual odor. When the steps are done in this order, the shop gets a far better result from a single visit, and the chance of the smell creeping back is much lower.

Keeping the deadline in view

For a print shop, the clock is always running. WHD can schedule the work outside business hours or over a weekend, and the team will tell you in advance which rooms will be closed and for how long. Many shops choose to treat the stockroom first while temporarily printing urgent jobs from a small, already-dry batch of paper kept in sealed plastic boxes. Planning the sequence together with the team means you can protect your most important orders while the recovery is under way.

10 Reasons Print and Sign Shops in Bang Kho Laem Choose WHD

1. An understanding of print materials. Paper, boxes and roll cores absorb moisture and odor easily, so the treatment is planned accordingly. See the ozone treatment service.
2. Controlled ozone dosing to reduce risk to rubber rollers and seals inside printers.
3. A clear routine for protecting machines: switch off, unplug, cover or remove before every job.
4. Surface disinfection after mud using Chemgene HLD4H delivered by ULV fogging.
5. Reaches dead spaces such as behind vinyl rolls, under printer stands and in stockroom corners.
6. Odor removed at the source, so it does not travel with customers' printed work. Read more about ozone odor removal.
7. After-hours scheduling so the shop can get back to printing in time for deadlines.
8. Practical advice on sorting materials, helping you decide what to discard and what can be kept.
9. Stock storage advice after service, including raised shelving, plastic boxes and humidity control.
10. Easy to reach: call 065-556-6294 or LINE @whd268. Service covers Bang Kho Laem, Yan Nawa, Sathon and all of Bangkok.

Before and After Ozone Treatment and Disinfection Fogging

Customer Voice (Example Scenario)

"My biggest fear was for the wide-format printer, which is the heart of the shop. The team had us switch it off, unplug it and cover it right in front of them, then explained which stacks of paper to throw away and which ones we could keep. When we reopened, the musty smell in the stockroom was much lighter, my staff could fetch paper without sneezing, and we delivered the temple banner on time."

- Thanakorn, print and sign shop owner, Bang Kho Laem (example scenario)

Storage Checklist for Paper and Vinyl After Service

• Place paper reams on pallets or shelves at least a hand-span above the floor and slightly away from the walls.
• Store vinyl and sticker rolls horizontally on racks or hang them on rods instead of standing them against the wall.
• Replace corrugated boxes that got wet with lidded plastic boxes.
• Run a dehumidifier in the paper stockroom and try to keep relative humidity below roughly 60 percent.
• Use older stock first so paper does not sit on the shelf for too long.
• Have a technician check the printers before use if they were exposed to high humidity.
• Check for odor and black spots on paper every week for the first one to two months.
• Keep a small emergency supply of paper in sealed plastic boxes on a high shelf for urgent jobs.

Frequently Asked Questions

Q: Will ozone damage my printers?
A: The team will have you switch them off, unplug them, cover them fully or move them out of the room, and will control the ozone dose to suit the space, reducing the risk to rubber rollers and seals.

Q: Can moldy paper be used again after ozone treatment?
A: Paper that was submerged or has mold growing into its fibers should be discarded. Ozone helps with the air and odor in the room and reduces airborne spores, but it does not restore damaged paper to new condition.

Q: Will printed vinyl fade?
A: High ozone concentrations over long periods can affect some colors and materials, so the team recommends moving finished jobs awaiting delivery out of the room before treatment.

Q: How many days will the shop need to close?
A: In most cases, disinfection fogging and ozone treatment, including ventilation time, can be completed in one day, depending on the size of the shop and the amount of material.

Q: Will the disinfectant stain the paper?
A: The team does not fog directly onto blank paper intended for printing and recommends keeping good stock in closed boxes during fogging.

Q: What should we do if the area floods again?
A: Lift materials to higher shelves before the water arrives, then contact the team after it recedes to assess whether a repeat treatment is needed.

Get Back to Printing on Time, Without a Musty Smell Reaching Your Customers

Book Ozone Treatment - Click Here

View Disinfection Service - Click Here

Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related Links

• Ozone odor and chemical residue removal
• Master Ozone Generator
• Chemgene HLD4H disinfectant spray
• All articles
• External source: World Health Organization: Floods and health