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Date：2026-10-07For garment trim mould, are the zips and buttons dosed with a masterbatch, or is the webbing padded? Trim is built from two materials: zip teeth, sliders and buttons are moulded plastic parts, where the mould grows on the surface, while webbing, woven labels and cords are textiles, where it grows inside the fibre. The zips and buttons take iHeir-IPL inorganic plastic antimicrobial agent at 0.8%-1.0% on resin weight, and the webbing and labels take iHeir-BJ textile mildew inhibitor at 2%-3% o.w.f. at the padding stage. This article covers the two lines.
1. Where the mould comes from: mouldings and textiles are two materials
The trim on a garment looks like odds and ends, but it is two material systems. Zip teeth, sliders, buttons and eyelets are PP, POM or resin mouldings that do not absorb water themselves, yet collect hand sweat, sewing oil and release aids on the surface, so once the packed garment takes up damp the mould spots start on the surface. Webbing, woven labels and cords are polyester or cotton textiles, whose fibres take up moisture and whose dyeing and finishing aids are themselves nutrients, so once moisture content runs high the mould grows inside the fibre.
The two are treated differently. The mouldings take the antimicrobial in the hopper with the masterbatch, distributed through the whole part; the textiles take a bath at the padding stage, where the agent bonds to the fibre surface. The denominators differ too, one on resin weight and one on dry cloth weight, so one figure for both means the plastic parts are overloaded and the webbing falls short.
Order matters: both stages happen before the garment is sewn. Spray the finished garment and only the exposed trim surface is reached, leaving the inner webbing and the back of the buttons untouched.
2. The two materials at a glance: mouldings and textile trim
The table lines up the part, the stage, what is treated, the product, the figures and the points to watch, so it can serve as the first draft of a trim process card.
| Part | Stage | Treated item | Product | Figures | Points to watch |
|---|---|---|---|---|---|
| Zip teeth, sliders, buttons | Injection | Resin | iHeir-IPL inorganic plastic antimicrobial agent | 0.8%-1.0% on resin weight | Inorganic silver type, whiteness above 90; coloured and pale parts resist a shift |
| Webbing, woven labels, cords | Padding / setting | Textile fibre | iHeir-BJ textile mildew inhibitor | 2%-3% o.w.f. | Bath 21-50 degrees, pH 4.5-8.5; premix with 9-13 times its weight in water and add in portions |
| Elastic webbing (with spandex) | Padding | Elastic fibre | Grade selection (by fibre tolerance) | Read the fibre’s heat limit | Elastic fibre dislikes heat; set the bath and drying temperatures before the line starts |
| Metal sliders, eyelets | Before assembly | Metal parts | Control only (not one of the two lines) | Protected by the two stages and packing | Metal itself does not grow mould; the oil and card around it do |
| Trim store and garment packing | Stacking / full container | Air in the stack and the box | Humidity control only | Below 60% relative humidity | Small trim is bagged tight and the core does not air out; sheets by stack |
Five rows, one conclusion: the mouldings are figured on resin weight and the textiles on dry weight, so the denominators differ and the figures never swap; the metal parts take no agent, and the store preserves the result.
3. Zips and buttons: IPL in the masterbatch at 0.8%-1.0%
The plastic trim line is completed at injection. Add iHeir-IPL inorganic plastic antimicrobial agent at 0.8%-1.0% on resin weight, made up first as a masterbatch or premixed with the pellets before the hopper. It is an inorganic silver type with whiteness above 90 and a particle size of 1-2 microns, more heat-tolerant than a conventional organic grade, so coloured and pale trim keeps its shade, which is where the inorganic type wins, since zip teeth and buttons are made in many colours. It ships in 25 kg fibre drums with a 12-month shelf life.
Three details. First, the figure is on total resin weight, regrind included, so any change in the ratio means recalculating. Second, zip teeth are small and thin-walled with many cavities, so they can only be dispersed through a masterbatch or a premix; powder fed straight in agglomerates. Third, where several colours run in one batch, split them by colour to avoid carry-over. See how to choose an antimicrobial for engineering plastics and transparent parts for the grade.
4. Webbing and labels: BJ in the padding bath at 2%-3% o.w.f.
The textile line is completed at the setting trough or the padding stage. Make up the liquor with iHeir-BJ textile mildew inhibitor at 2%-3% o.w.f. on the dry weight of the cloth, premixing it with 9-13 times its weight in water and adding it to the bath in portions; 0.1% of a wetting agent can go in first. Run the bath at 21-50 degrees and pH 4.5-8.5, with pick-up taken at 70%. The product bonds to the fibre surface to form an antimicrobial layer; it is a non-releasing type, so the layer lasts as long as the article.
Three details. First, BJ is cationic, so it must not share a bath with an anionic auxiliary, or the emulsion breaks and the treatment fails, which means softening and anti-mould treating belong in separate baths. Second, the figure is on the dry weight of the cloth, and light webbing varies in moisture, so measure it before the bath. Third, woven labels often carry a coating or foil, so confirm how it interacts with BJ rather than treating the whole roll in one go. See how to choose an anti-mould agent for the grade.
5. Trim store and garment packing: the finishing stretch with no dose
Trim usually arrives as small items in bags or on cards, and bag against bag is tight with poor air movement, so damp cannot leave the core of a stack. Place gas-phase sheets by stack, keep them apart with liner paper, and hold the store below 60% relative humidity; dry the trim and the carton before the garments are packed, because condensation inside the container on a long voyage is the ignition point. Metal parts do not grow mould themselves, but the oil around a slider and the card that holds an eyelet can go mouldy with the packing.
6. Questions that come up: one figure for both, and finishing at the garment plant
Can the zips and the webbing share one figure? No. Plastic trim takes 0.8%-1.0% on resin weight and the webbing takes 2%-3% o.w.f. on dry cloth weight; the denominators and the order of magnitude both differ, so copying the number either wastes material or falls short.
Can all the trim be finished at the garment plant instead? Not advised. The plastic parts take the agent with the masterbatch and the webbing takes it in the padding bath, and both are simplest before the trim leaves the maker; leaving it until after sewing reaches neither the inside of the material.
Can the wetting agent be dropped from the webbing bath? On the current process, adding 0.1% of a wetting agent first lets the liquor wet the fibre more evenly, especially on water-repellent webbing; drop it and the bath may be uneven and the anti-mould layer thin in places.
Two dosing points carry the work: the moulded zips and buttons go in with the masterbatch at injection (iHeir-IPL inorganic at 0.8%-1.0%, whiteness above 90, particle size 1-2 microns, 25 kg fibre drum), and the webbing and labels take the bath at the padding stage (iHeir-BJ at 2%-3% o.w.f., bath 21-50 degrees, pH 4.5-8.5, premixed with 9-13 times its weight in water and added in portions, pick-up 70%, 0.1% wetting agent first). The trim store and garment packing preserve both by humidity control and gas-phase sheets. Test the long-term growth by a method such as ASTM G21 and hold a complete sample per batch, since testing the plastic trim alone or the webbing alone does not count. Samples and TDS sheets are available for a trial on your own line.
