Mechanical Foam Breaker for Paper Mill White Water
Pulp suspensions, white water and coating kitchens all foam — and the bubbles travel into the sheet. Foam causes pinholes, breaks and fibre loss, while chemical defoamers can upset retention and sizing chemistry.
What foam actually costs you
- ▲Air bubbles in the pulp reach the sheet — pinholes, coating defects and sheet breaks
- ▲Foam carries fibre out of the process and slows water removal
- ▲Chemical defoamer can interfere with retention aids and sizing chemistry
- ▲Foam in coating and size-press kitchens disrupts dosing accuracy
How the DP Series fixes it
The DP Series breaks pulp and white-water foam mechanically on open chests and tanks, keeping the stock foam-free without dosing. No chemistry interference, no consumables.
Open-chest and tank mounting; robust construction for pulp service.
Discuss your stock preparation and foam rateDP foam breaker model range for Paper
All DP models use the same mechanical defoaming principle — choose by your foam overflow rate. Size up one step if your rate is near the upper limit.
| DP foam breaker model | Power (kW) | Speed (rpm) | Defoaming capacity (m³/h) |
|---|---|---|---|
| DP-1 | 0.75 | 2,800 | 5 |
| DP-2 | 1.1 | 2,850 | 10 |
| DP-3 | 1.5 | 2,850 | 15 |
| DP-4 | 2.2 | 2,850 | 20 |
| DP-5 | 3 | 2,850 | 30 |
| DP-6 | 4 | 2,850 | 40 |
| DP-7 | 5.5 | 2,850 | 60 |
| DP-8 | 7.5 | 2,850 | 80 |
| DP-9 | 11 | 2,900 | 100 |
| DP-10 | 15 | 2,900 | 150 |
| DP-11 | 22 | 2,900 | 200 |
| DP-12 | 30 | 2,900 | 300 |
| DP-12S | 37 | 2,900 | 500 |
Mechanical foam breaker sizing calculator
Enter your tank dimensions and foam overflow rate. This calculator recommends the smallest DP mechanical defoaming machine that handles your process.
This application runs on the DP Series mechanical foam breaker — see the full model range, technical specifications, sizing calculator and wetted materials.
Why a mechanical foam breaker beats chemical defoamers here
Mechanical foam breaker (DP Series)
- • No chemical dosing — zero interference with your process chemistry
- • One-time purchase, 12-month warranty, 10-year service life
- • No ongoing anti-foam agent cost — payback in 6-12 months
- • No residue in product or effluent — food & pharma safe
- • Centrifugal principle: instant foam breaking at the surface
Chemical defoamer dosing
- • Recurring chemical cost every month
- • Can alter product flavour, colour or reaction chemistry
- • Residue in effluent increases wastewater load
- • Dosing pump maintenance and inventory
- • Overdosing kills the foam you actually need
Frequently asked questions
Why does pulp and white water foam?
Pulp suspensions and white water contain fines, resins and process additives that stabilise air bubbles. Recirculated water keeps the foam load in the system.
How does foam cause paper defects?
Air bubbles carried into the sheet create pinholes, coating defects and sheet breaks — directly affecting paper quality and machine uptime.
Will the foam breaker interfere with retention aids?
No. Mechanical breaking adds no chemistry, so it cannot upset retention aids or sizing. Chemical defoamers are the ones that can interfere with the wet-end chemistry.
Where is it installed in the stock preparation area?
On open chests and tanks where foam forms — stock prep, coating kitchens and white water systems. The DP-K model mounts above the liquid surface.
Foam control in related processes
Get a quote for your foam problem
Tell us your application, tank volume and foam rate — we will recommend the right DP Series model and quote within one working day.