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Date：2026-10-13How is small home appliance mould kept out before dispatch, when assembly, the finished-goods store and the carton are all in the chain? A line with no dehumidification and a store with no humidity control will still see mould start in the liners, however tight the packing is. Assembly holds relative humidity below 60% and keeps incoming parts dry, the finished-goods store controls humidity through off-wall, off-floor stacking and first-in first-out, and the packing stage seals the carton with iHeir-D gas-phase antimicrobial and mould inhibitor made into anti-mould paper or sachets at 0.1-0.2 g of active ingredient per sheet, or with Power Pak powerful anti-mildew and deodorizing tablets.
1. Three gates before dispatch: assembly, store and packing
Trouble in small appliances usually does not show on the line but once a batch has sat in the store, or when a customer opens the carton. The cause is rarely the shell; it is the air between the parts. Humidity in the assembly shop, in the store and inside the carton form one series, so a stage left open takes the value out of the stage after it.
The three stages are different kinds of control. Assembly covers ambient humidity and the moisture on incoming parts, which is process control. The store covers humidity and stacking during storage, which is turnover control. Packing covers the small volume of air in the carton, which is finished-product control. They are judged differently too: the first two by humidity logs and moisture content, the third by seal integrity and the items placed in the carton.
Keeping them separate means each stage can be accepted and traced on its own. Packing alone, with no control over the environment, simply seals the moisture inside and makes things worse. Export batches add a layer, since the container swings more than any store; see mould prevention for courier bags and damp-season storage.
2. Humidity control and dosing at a glance
The table lines up the stage, what it controls, the main measures, the figure and the points to watch, as a first draft of a damp-control work instruction.
| Stage | What it controls | Main measures | Figure or criterion | Points to watch |
|---|---|---|---|---|
| Assembly | Shop air and incoming parts | Dehumidification, immediate use after opening, resealing of leftovers | Relative humidity below 60% | Keep windows shut on wet days; clean benches and bins on shift, not monthly |
| Finished-goods store | Cartons and liners in storage | Dehumidifiers, off-wall and off-floor stacking, first-in first-out | Relative humidity below 60% | Cartons never against the wall or on the floor; step up checks in the wet season |
| Packing, paper and sachets | Carton air and liners | iHeir-D coated or printed onto paper as anti-mould paper or sachets | 0.1-0.2 g of active ingredient per sheet | Sealed with the product; adjusted to carton size and free space |
| Packing, gas-phase tablets | The finished carton | Power Pak anti-mould and deodorising tablets | Takes effect within 72 hours of sealing | Seal soon after packing; replace after 15 days open; torn or damp cartons lose the effect |
Four rows make the division of work clear: the first two dose no product and rely on equipment and discipline, while the last two dose product and look after the air inside the carton.
3. Assembly: dehumidification and keeping incoming parts dry
Assembly has two sources of moisture to hold apart. The first is the air, held below 60% relative humidity across the area with dehumidifiers and monitored more closely in the wet season and on rainy days; readings belong in a log, not in someone’s judgement. The second is the parts. Bought-in plastic parts, wiring and fasteners pick up moisture in transit and in store, so they go to the line soon after opening and any remainder is sealed straight back, not left open overnight beside the bench.
Two details get missed. Benches and bins collect dust and grease, exactly where mould settles, so cleaning by shift beats a monthly sweep. And the corrugated trays and EPE liners used to move parts are absorbent: once damp they carry moisture to the line, so they are stored separately with humidity held down.
4. Finished-goods store: humidity, stacking and rotation
The store handles three things: humidity, stacking and rotation. Humidity is held below 60% with dehumidifiers and logged continuously, with running hours adjusted in the wet season from those readings. Cartons are stacked off the wall and off the floor with ventilation aisles open, never flat against an external wall nor straight on the ground, so damp in the structure does not pass into the cartons.
Rotation belongs to damp control as much as equipment does. Finished goods ship first-in first-out, and the shorter a batch stays in the store the less chance there is of trouble. A batch whose cartons are damp, torn or crushed is isolated first, then sampled, and only then is the liner moisture content checked before a decision. The acceptance evidence at this stage is the humidity log and the sampling record, so a complaint can be traced.
5. Packing: how the paper and the tablets are dosed
Packing looks after the air inside the carton, and both routes are well established. The first is to coat or print iHeir-D gas-phase antimicrobial and mould inhibitor onto paper as an ink, dry it into anti-mould wrapping paper or sachets, and seal it with the product, at 0.1-0.2 g of active ingredient per sheet, adjusted to the humidity, temperature and free space in the carton. This route suits liners, manuals and accessory bags, where the paper itself is the carrier.
The second is to place a gas-phase tablet such as Power Pak powerful anti-mildew and deodorizing tablets in the carton. Three things matter. Seal soon after packing, because the tablet takes effect within 72 hours of the carton being closed. Where inspection requires opening, replace the tablet once it has been open past 15 days, since the gas phase has dispersed. And a torn or damp carton loses the effect, so batches at risk of rain get a plastic bag. Choose by service life: the green version runs 6 months for short and medium transport, while blue and black run 12 months for long sea freight. Wear rubber gloves when handling, store cool and dry; shelf life is one year.
6. Questions that come up: packing alone, and how many tablets
Is a tablet in the carton enough without controlling the shop and the store? No. The free space in a carton is small and the tablet only covers that volume. If the carton and liner have already taken on moisture, sealing them in makes matters worse. Environmental control comes first and in-carton protection is added on top.
How many tablets does a carton take? There is no single fixed number. It follows carton size, free space, packing material and storage length: large cartons with heavy liners and long storage take more, small short-cycle cartons fewer. Once set, a sealed-carton trial is opened at the 15-day mark and the next batch is adjusted from it.
What happens after an inspection opens the carton? Reseal straight afterwards and replace the tablet at that point. Where a batch is opened repeatedly, match the tablet count to the inspection frequency rather than leaving the carton half open overnight. Records can follow GB/T 4768 for anti-mould packaging, with carton and liner moisture checked by the GB/T 462 family.
Three points carry the work. Assembly holds relative humidity below 60%, uses incoming parts straight after opening and reseals the remainder. The finished-goods store holds humidity down with off-wall and off-floor stacking, dehumidification and first-in first-out. Packing seals the carton with iHeir-D gas-phase antimicrobial and mould inhibitor made into anti-mould paper or sachets at 0.1-0.2 g per sheet, sized to the carton, or places Power Pak tablets that take effect within 72 hours of sealing and are replaced after 15 days open. Samples and TDS sheets are available to check the configuration against your carton sizes and export cycles.
