How Are Laundry Detergent Sheets Made? PVA Film, Step by Step

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Laundry detergent sheets are made by casting a liquid film and drying it. Manufacturers dissolve a water-soluble polymer, usually polyvinyl alcohol (PVA or PVOH), in water, mix in the detergent ingredients such as surfactants, spread the mixture into a thin layer of set thickness, and dry it into a sheet that is then cut to size and packaged. A patent for a laundry sheet held by LG Household & Health Care describes exactly that method, and sheet manufacturers describe the same basic flow: formulation, film casting, drying, cutting, quality control and moisture-proof packaging.

Last updated: November 14, 2026.

Below: what is in a detergent sheet, each step of production, why the polymer matters, and the debate over what happens to PVA after the wash. Related guides: is laundry detergent bad for the environment, powder vs. liquid laundry detergent and how many ounces of laundry detergent per load.

What is in a detergent sheet

A sheet has two core parts, according to Youming, a manufacturer that makes laundry sheets for other brands:

A water-soluble film carrier, usually polyvinyl alcohol. Kuraray, a PVOH producer, says PVOH is the preferred binder for detergent sheets because of its water solubility, binding power and compatibility with a wide range of detergents, and that it gives sheets mechanical strength while keeping a soft feel.
A concentrated detergent system: surfactants, builders, enzymes and other additives.

The LG patent describes the result as a water-soluble sheet with the detergent ingredient dispersed in a polymer matrix, which cleans as the sheet dissolves in water.

How sheets are made, step by step

Youming describes six production stages:

Stage	What happens
1. Formulation	Detergent actives are compounded into a controlled slurry or coating mixture
2. Film casting or coating	The detergent is deposited onto or blended into the water-soluble PVA layer, with coat weight kept even so each sheet gets the same dose
3. Drying and curing	Moisture is drawn down to a target level; too much makes sheets sticky, too little makes them brittle
4. Cutting and perforation	Sheets are cut to a precise dose size, as single sheets or tearable multi-sheet strips
5. Quality control	Dissolution testing at the target water temperature, ingredient assays, dose consistency and storage stability checks
6. Packaging	Sheets are sealed in moisture-barrier packaging

The LG patent gives a lab-scale example of the casting and drying steps: a PVA solution was spread on a release film, set to a predetermined thickness with a film applicator, and dried in an oven at 105 °C for 10 minutes, producing a sheet 0.01 cm thick.

Why the polymer is tuned carefully

The patent explains a balancing act. A sheet that is too hard can break apart during manufacture, and one that is too soft is hard to cut to size and transport. The patent addresses this through the polymer’s glass transition temperature, the point where it shifts from rigid to flexible, specifying PVA with a glass transition temperature of 56 to 75 °C, preferably 62 to 73 °C.

Kuraray says its range of PVOH grades lets manufacturers balance fast solubility, low residue, binding power and mechanical strength.

Why packaging still matters

Sheets still need protection from humidity. Youming says sheets are hygroscopic (they absorb moisture from the air), so moisture-barrier packaging is essential and weak packaging can undo the shelf stability built in during production. Keep sheets in their sealed container and away from damp areas.

Youming also calls dissolution the top failure mode for sheets and says cold-water and hard-water performance must be tested rather than assumed. If sheets leave residue in a cold wash, check the brand’s directions for water temperature.

The PVA debate

What happens to PVA after it dissolves is disputed. A 2021 Arizona State University study estimated that as much as 75% of the PVA from laundry and dish pods in the U.S. passes through wastewater treatment untreated, about 8,000 tons a year; the study was supported in part by Plastic Oceans International and Blueland. An expert panel convened by SciPinion reviewed that study, identified what it called substantial methodological flaws, rated it 3.9 out of 10, and concluded that PVA is readily biodegradable and removed in wastewater treatment. Kuraray describes PVOH as inherently biodegradable in water. Both studies concern pods; neither looks at sheets specifically. See is laundry detergent bad for the environment.

Frequently asked questions

Are detergent sheets plastic?

Their film is usually polyvinyl alcohol, a water-soluble synthetic polymer. Whether it fully biodegrades after the wash is disputed, as described above.

Are sheets made the same way as pods?

Both use PVA, but differently. Pods wrap detergent inside a PVA film, according to ASU; sheets disperse the detergent within the PVA film itself, as the LG patent describes.

Why do my sheets stick together?

Youming says sheets are hygroscopic and that too much residual moisture causes sheets to stick. Keep the package sealed and stored somewhere dry.

Why didn’t my sheet dissolve?

Youming calls dissolution the top failure mode and notes that cold-water and hard-water performance vary. Follow the brand’s directions for water temperature and load size.

How Are Laundry Detergent Sheets Made?