A liquid dose is harder on film than a powder dose. The film is under constant load, the seal is under constant pressure, and the contents are often aggressive. The pack has to hold for months and then disappear in one wash.
A single-dose liquid pouch is a sealed water-soluble film pack holding one measured dose of liquid, gel or concentrate. The user drops the whole pack into the wash, the tank or the process water. The film dissolves and releases the dose with no measuring, no spillage and no packaging waste to dispose of.
For brands, the appeal is accuracy and convenience. For the film, it is the hardest job in the water-soluble category — a liquid load never stops pushing against the film and the seal.
| Specification | What we supply |
|---|---|
| Film grade | Warm-water PVA, 40–60 °C, matched to the process water your user works with |
| Format | Finished pouches, or film in rolls for your own form-fill-seal line |
| Dose size | Made to your fill volume and pouch dimensions |
| Seal strength | Film supplied to a seal window agreed with your machine and your fill |
| Barrier | Film selected for the aggressiveness of the fill — water-based, surfactant-heavy or solvent-containing |
| Plain film, or printed with branding and dosage marks |
Powder sits in the pouch. Liquid pushes against it — hydrostatic pressure on the seams, and continuous contact between the fill and the inside surface of the film. Water-based fills can migrate into the film over time, softening it and weakening the seal. Some surfactants and solvents attack the film directly.
The result is that a formula which works perfectly for a powder pod can fail in weeks with a liquid fill. The film, the plasticiser level and the seal window have to be selected together, and tested with the actual fill rather than water.
Send the fill formulation or a description of it, the dose size and your machine details. We reply within one business day with a film recommendation, a sample plan and timing. You test the samples with your actual fill on your own line. Bulk production starts only when the pack performs as agreed.
For how film grades are matched to process water, read PVA film grades: cold, warm or hot water?. For the grading criteria brand owners apply to pod and pouch film, see Detergent pod film: what brand owners check first.
The questions buyers ask most about this application.
Yes, provided the film and the seal are specified for a liquid fill. The film sits under constant load from the liquid, so thickness, plasticiser level and seal window are set together and tested with your actual fill rather than with water.
Warm-water PVA film, 40–60 °C, matched to the process water temperature where the pouch will be used. If the pack is designed for a cold or eco wash, the film has to be specified for that instead.
Strong solvents, highly acidic or alkaline fills, and formulations with a high free-water content are the difficult cases. Send us the formulation or a description and we will tell you honestly whether PVA film is the right route or not.
Yes. We supply film in rolls — width, core size and length to your line — for customers who fill and seal on their own machine, as well as finished pouches.
Sampling is the first step of every project. We agree a sample plan with you, you fill and seal the samples with your own product on your own line, and bulk production only starts when the pack performs as agreed.
Send your product, the pack size you need and your target quantity. We reply within one business day with a film recommendation, a sample plan and a quote.
Chat on WhatsAppor send the form — we reply within one business day
Sainsun PVA