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Date：2026-09-30Can you stop ride-on cover mould? Yes, but it has to be done at two points, because the seat cover and the canopy are not the same substrate. A woven seat cover is usually oxford or polyester and takes iHeir-BJ textile anti-mould agent by padding at 2%-3% o.w.f.; the canopy and any nonwoven parts take iHeir-PG nonwoven antimicrobial agent by padding at 20-40 g/L with drying at 100-170 degrees. This article covers both finishing routes, the figures and the drying window.
1. Where the mould on a cover comes from
A ride-on cover is normally two pieces: the seat, in a woven fabric such as oxford or polyester with foam or wadding behind it, and the canopy, in coated cloth or nonwoven. They are different substrates and they run on different finishing equipment, and the place the spots appear usually tells you which piece was left unprotected.
On the seat, spots start at the seams, the piping and the loaded area of the seat face. The cloth itself does not hold water, but the foam and wadding behind it take up moisture and cannot let it go, so they become the source; once the seat is packed and compressed, water moves back and forth between the cloth and the filling. On the canopy, spots start at the back of the cloth and along the creases, because a canopy sits in sun and damp and often carries a coating, and the interface between coating and substrate is where vapour collects. The equipment requirement differs as well: seat fabric suits padding or impregnation, while canopy and nonwoven parts are best padded before setting. Sort the routes by piece rather than running one finish across everything.
2. The two finishing routes at a glance
The table lists the piece, the substrate, the recommended product, the figures and the points to watch, and can serve as the first draft of a process card.
| Piece | Substrate | Product | Figures | Points to watch |
|---|---|---|---|---|
| Seat cover | Oxford, polyester woven cloth | iHeir-BJ textile anti-mould agent | Pad at 2%-3% o.w.f. | Bath 21-50 degrees, pH 4.5-8.5; soft water, pre-mix with 9-13 times water; cationic, never in the same bath as an anionic agent |
| Canopy and nonwoven parts | Coated cloth, nonwoven | iHeir-PG nonwoven antimicrobial agent | Pad at 20-40 g/L | Working liquor pH 6-8, wet pick-up 70%, dry at 100-170 degrees; no extra heat setting needed |
| Foam and wadding | Foam, wadding | Process control | Set by the temperature curve and moisture content | Filling is the slowest part to dry; confirm moisture content before packing |
| Finished-goods store | Cover sets | Humidity control, first in first out | Store below 60% relative humidity | Off the floor, away from the wall, first in first out, no pending batch against an outside wall |
| Packing | Full cartons | Packing control | Set by batch and voyage | Confirm the covers are cool and back to spec before the carton is sealed |
| Retained sample check | Finished goods and batch sample | Test to the contract scope | Keep one sample a batch | Hold at 28 degrees and 85% humidity for 7 days and read the seams and the back of the canopy cloth |
Six rows, one conclusion: the seat stage covers the cloth, the canopy stage covers the back of the cloth, and the filling and the store hold the moisture. Miss one and the mould starts there.
3. The seat: setting iHeir-BJ at 2%-3% o.w.f.
The seat fabric is the one place where the protection can be built into the fibre. iHeir-BJ textile anti-mould agent is applied by padding at 2%-3% o.w.f., with the bath held at 21-50 degrees and the working liquor at pH 4.5-8.5. Mix with soft water, pre-mix with 9-13 times its volume of water before it goes into the bath, hold the wet pick-up at 70%, then dry on the normal route.
Three things belong in the process card. First, BJ is cationic and must not share a bath with an anionic softener, fixing agent or any other anionic auxiliary, which cancel each other out; where a soft finish is also needed, run it separately with a rinse in between. Second, the figure is on dry fabric weight, and estimating from bath volume multiplies the error on a woven cover. Third, whether to take the top or the bottom of the range depends on the end use and the storage period, and long-stock and export orders take the top. Outdoor fabrics often need waterproofing and mould protection together, so confirm the order of the two finishes and their compatibility on a small sample first; the reasoning is set out in water-repellent finishing for tents and outerwear.
4. The canopy and nonwoven parts: iHeir-PG at 20-40 g/L
The canopy and nonwoven parts take the other route. iHeir-PG nonwoven antimicrobial agent is used by padding at 20-40 g/L, with the working liquor at pH 6-8 and the wet pick-up at 70%, dried at 100-170 degrees, and it needs no extra heat setting. Canopy cloth and nonwoven parts usually go on to the existing setting or laminating step, so the agent goes into the pad bath and is carried through with the substrate.
Whether to take the top or the bottom of the range depends on the substrate weight and the storage period. Light nonwoven takes the lower figure; heavy canopy cloth, laminated substrates and long-stock export orders take the higher one. One point deserves attention: the back of canopy cloth and its creases are where vapour collects, so the pickup has to be even. An uneven pickup leaves a weak band along the crease, and that is where the mould starts.
5. Filling and storage: holding what the first two stages built
The foam and wadding take no agent, but they are the slowest part of a seat to dry. Goods should only be packed once they are cool and back to spec; packing hot or damp is the most common cause of rework on covers. Keep the store below 60% relative humidity, run the dehumidifier through the wet season and log the curve, load cover sets off the floor and clear of the wall, run first in first out, and never stage a pending batch against an outside wall.
The acceptance rule matters as much. A fresh sample passing does not mean the stacked goods will. Keep one sample a batch and hold it at 28 degrees and 85% humidity for 7 days, reading the seams and the back of the canopy cloth, the two places that fail first. The seat fabric and the canopy cloth are different substrates, so the test sample has to cover both or the conclusion will be biased.
6. Questions that come up
Can the seat and the canopy share one finish? Better not to. The seat is a woven fabric dosed on dry fabric weight, while the canopy and nonwoven parts are dosed on pad concentration in grams per litre; the substrates and the machines differ. Run each piece on its own route and keep the two figures apart.
Can iHeir-BJ share a bath with a waterproofing agent? That depends on the ionic character of the waterproofing agent. BJ is cationic and cancels out an anionic auxiliary in the same bath. Where both finishes are needed, confirm compatibility and the order of application on a small sample, then validate across the line.
Does the canopy need drying after padding? Yes. Dry at 100-170 degrees with the wet pick-up held around 70% and an even pickup, because uneven pickup along a crease is the usual cause of the spots that appear later.
Ride-on cover mould has two clear points: the seat takes iHeir-BJ by padding at 2%-3% o.w.f., holding pH 4.5-8.5 and staying out of any anionic bath, while the canopy and nonwoven parts take iHeir-PG by padding at 20-40 g/L with drying at 100-170 degrees. The filling and the store hold the moisture between them. Samples, TDS sheets and minimum order details are available for both, and we are glad to run a trial on your line.
