Project Description
Pulp & Paper Defoamer Manufacturer: Pulp Mill & Wet End Solutions
Foam remains a persistent challenge across continuous pulp manufacturing and paper machine loops. Without structured deaeration and foam control solutions, excessive gas entrainment impairs sheet formation, increases chemical consolidation costs, and disrupts automated production lines.
Pulp Mill & Wet-End Application Requirements
- Injection Point: Feedstocks must be introduced directly into high-turbulence process zones (e.g., fan pump inlet) to secure optimal emulsion dispersion boundaries.
- Continuous Dosing: Verification via positive displacement diaphragm metering pumps with ±1% accuracy baseline is required to stabilize chemical parts-per-million (PPM) concentrations.
- Temperature Monitoring: Real-time audit of white water loop parameters (45-60°C) ensures that selected polymers operate seamlessly relative to their formulation cloud point thresholds.
- Shear Stability: Synthetic structures must withstand high-speed centrifugal cleaners and pressure screens without experiencing phase separation or oil slicking hazards.
1. Drainage Impairment
Entrained microscopic air bubbles inside the machine headbox retard the dewatering acceleration curve across the forming wire, limiting maximum machine speeds and elevating steam consumption parameters within dryer sections.
2. Surface Defects (Pinholes)
Persistent macro-foam accumulation at the air-fluid interface yields pinholes, craters, and fish-eyes on the finished paper sheet, resulting in rejected reels and compromised coating distribution uniformity.
3. Chemical Carryover
Inefficient brown stock washing operations induce black liquor organic carryover boundaries, multiplying downstream bleaching chemical consumption values and elevating chemical oxygen demand (COD) baselines in plant effluent streams.
Defoamer Selection Guide: From Pulp Mill to Paper Machine
| Process Stage | Foam Challenge | Recommended INVINO® Grade (With Technical Specs) |
|---|---|---|
| Pulp Mill (Black Liquor) Washing & Screening | High Alkali & Lignin surfactant concentrations |
INVINO-6930 (Silicone Emulsion) High solid fraction; structurally stable across chemical pulping black liquor systems. |
| Paper Machine (Wet End) White Water System | Entrained Micro-gas & Drainage delays |
INVINO-5045 (35–45°C) / INVINO-5060 (45–60°C) Non-silicone fatty alcohol emulsions. Delivers prompt degassing action with zero impact on paper sizing retention. |
| High-Speed Paper Machine Closed Loop Systems | Stubborn Micro-foam accumulation under high shear |
INVINO-8062 (100% Active Matter) Alkylene oxide copolymer / Polyether series. Engineered for elevated concentration thermal stability boundaries. |
| Paper Coating Sizing Press / Kitchen | Surface Defects (Fisheyes, micro-voids) |
INVINO-3000 (100% Active Hydrocarbon) Hydrocarbon mineral oil base. Formulated for pigment dispersion leveling without causing clearcoat oil spots. |
| Surface Sizing | Film Uniformity limitations |
INVINO-8082 (100% Active Matrix) Polyether ester compound variant. Tailored for sizing solution crosslinking compatibility. |
Foam Control: From Pulp Mill to Paper Machine
The Challenge: Black liquor macro-foam generated by isolated residual lignin fractions and high alkalinity boundaries during washing lines.
The Impact: Impairs brown stock washing acceleration metrics, yielding extensive chemical carryover loops.
The Solution: Modified organosilicone structural compounds configured stable under high thermal and alkaline thresholds.
The Challenge: Entrained gas phase anomalies and continuous surface foam inside closed loop white water systems.
The Impact: Retards wire drainage velocity, creating sheet pinholes and recurring machine breaks.
The Solution: Non-silicone fatty alcohol or block polyether blends optimizing prompt slurry degassing without creating pitch spots.
The Challenge: Micro-bubble generation during intensive pigment blending and modified starch preparation stages.
The Impact: Induces visible surface craters and fisheyes across the finished coated paper web.
The Solution: Formulated mineral oil structures calibrated for uniform coating leveling and sheet flatness.
Customer Success Stories with INVINO Pulp & Paper Defoamer
Case Study 1: INVINO-5045 Fatty Alcohol Defoamer for Papermaking (White Water)
Background: A high-capacity paper packaging mill required reliable deaeration to optimize web sheet drainage in the headbox and forming fabric.
Challenge: Existing competitor batches failed to hold foam control during high-speed machine runs.
Solution: The facility switched to INVINO-5045 non-silicone fatty alcohol emulsion, achieving stable gas release at high machine speeds with consistent dosing.
- Improved web drainage and paper sheet uniformity.
- Fewer manual maintenance stops thanks to stable foam suppression.
- Lower cost per ton through reduced dosing rates (PPM).
Case Study 2: INVINO-8062 Polyether Defoamer for High-Temperature White Water Systems
Background: A linerboard mill faced heavy foam in its closed-loop white water system when temperatures rose above 50°C.
Challenge: Standard competitor antifoams broke down at high temperature, causing phase separation and oil defects on the paper web.
Solution: The mill deployed INVINO-8062, a 100% active block polyether deaerator that stayed stable up to 60°C.
- Suppressed micro-bubbles in high-temperature white water circuits.
- Improved white water recovery loop consistency.
- Eliminated phase separation, holding precise dosage.
Critical Process Warning: Preventing "Pitch Spots"
Overdosing silicone defoamer in the wet-end white water loop can make it agglomerate with wood resins and pitch, forming adhesive "pitch spots" on the forming felt. Follow a strict step-dosing protocol: start at 10 PPM, track drainage speed, then scale up gradually. For paper grades that need strong AKD/ASA sizing retention, always choose a silicone-free fatty alcohol defoamer instead of silicone.
Pulp & Paper Defoaming: Technical FAQ
Q1: Does the defoamer interfere with paper sizing (AKD/ASA) efficiency?
A: It depends on the formulation. Overdosing standard silicone fluids can degrade sizing. For high-retention sizing papers, use our silicone-free fatty alcohol grade INVINO-5045, which has zero impact on AKD/ASA sizing retention.
Q2: Why does my defoamer lose efficacy when the white water temperature exceeds 55°C?
A: Above the cloud point of standard surfactant packages, the active components precipitate out and stop controlling foam. For 55–65°C systems, switch to our high-stability polyether grade INVINO-8062.
Q3: How can we prevent "pitch spots" or oil spots on the paper felt?
A: Pitch spots come from emulsion breaking under high shear or incompatibility with wood resins. Use a low-shear dosing point, select a high salt-tolerance antifoam, and for sizing-sensitive grades use a silicone-free fatty alcohol defoamer instead of silicone. Periodic fabric flushes also help.
Q4: What is the recommended dosing point for wet-end foam control?
A: Inject the defoamer into a high-turbulence point such as the fan pump inlet or the white water collection tray weir to maximize dispersion. Avoid dosing into stagnant holding tanks, which causes concentration stratification.
Free Sample & Free Lab Foam Test
- 100% Free Samples (100–500 g) — buyer covers courier (DHL/FedEx/TNT) or uses their own account; we refund the freight on your first bulk order.
- Send Us Your Foaming Liquid — our China lab runs a dynamic foam test on your actual white water and formulates a 100% tailored defoamer, free of charge.
- Flexible Logistics — 25 kg drum / 200 kg drum / 1000 kg IBC. No MOQ at the sample stage; 1-ton MOQ for bulk orders.
- 24-Hour Technical Response — countertype sheet and quotation returned within 24 business hours.
Certified Quality & Trusted Supply
REACH SVHC-241, PAHs, phthalates and heavy-metal compliance reports available on request. Trusted by leading chemical and paper groups:
Request Your Papermaking Defoamer Solution
Standard Protocol for Industrial Sample Verification and Dispatch
System Parameter Submission
Provide your slurry fiber type, machine wire speed, white water temperature, and pH so we can match the right grade.
Laboratory Formula Evaluation
Our pulp & paper lab reviews your profile and returns a target grade, countertype sheet, and quotation within 24 business hours.
Physical Sample Dispatch
Free trial samples ship via expedited global freight so you can run a mill trial and track dosage immediately.
