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 parameters in the headbox and forming fabric terminal.
Challenge: Existing operations using competitor batches failed to maintain foam control parameters across high-speed structural machine run times.
Solution: The facility substituted the active line with INVINO-5045 non-silicone fatty alcohol emulsion. This achieved stable dynamic gas release across elevated machine velocities, delivering chemical consistency.
- Optimized web drainage and paper sheet uniformity metrics.
- Reduced manual plant maintenance intervals via stable gas suppression.
- Secured cost-efficiency parameters through lowered volumetric parts-per-million addition rates.
Case Study 2: INVINO-8062 Polyether Defoamer for High-Temperature White Water Systems
Background: A continuous linerboard processing plant faced acute foam accumulation limits within its closed-loop white water recovery system, specifically when temperatures surpassed 50°C.
Challenge: Standard competitive anti-foam additives lost structural equilibrium properties, breaking phase balance and generating surface oil defects on the paper web.
Solution: Application lines deployed INVINO-8062, a 100% active block polyether deaerator designed for elevated temperature extremes. The polymer compound maintained active emulsion integrity up to 60°C boundaries.
- Suppressed persistent micro-bubble accumulation inside high-temperature white water circuits.
- Elevated white water recovery loop system volume consistency metrics.
- Eliminated chemical phase separation risks, maintaining precise dosage boundaries.
Critical Process Warning: "Pitch Spots" Prevention
Excessive or uncalibrated application of organic silicone compounds within wet-end white water loops can induce severe **agglomeration with wood resins and wood pitches**, precipitating adhesive "pitch spots" across the forming felt. We dictate a strict **Step-Dosing Protocol**: initiate baseline input at exactly 10 PPM, tracking drainage velocity variations prior to volumetric scaling. Always deploy certified non-silicone **fatty alcohol types** for paper grades demanding rigid AKD/ASA sizing retention compatibility.
Pulp & Paper Defoaming: Technical FAQ
Q1: Does the defoamer interfere with paper sizing (AKD/ASA) efficiency?
A: It depends strictly on formulation composition. Over-dosing standard silicone fluids can degrade sizing parameters. For high-retention sizing papers, we recommend our specialized non-silicone fatty alcohol grade INVINO-5045, which guarantees zero impact on AKD/ASA anchoring metrics.
Q2: Why does my defoamer lose efficacy when the white water temperature exceeds 55°C?
A: Thermal acceleration shifts solubility parameters. When process systems cross the cloud point threshold of standard surfactant packages, active chemical structures precipitate out prematurely. For severe 55-65°C thermal boundaries, processing lines must substitute to our high-stability 8062 polyether series.
Q3: How can we prevent "pitch spots" or oil spots on the paper felt?
A: Material spotting stems from emulsion breaking under intensive centrifugal shear or wood resin incompatibility. Deploying a low-shear dosing point and verifying high salt tolerance parameters within the antifoam emulsion baseline prevents oil agglomeration. Fabric chemical flushes with specialized industrial detergents are advised.
Q4: What is the recommended dosing point for wet-end foam control?
A: To maximize active micelle distribution, inject the agent compound directly into high-turbulence flow junctions, specifically the entry inlet of the fan pump or the white water collection tray weir. Avoid feeding into stagnant holding reservoirs to prevent chemical concentration stratification.
Request Your Papermaking Defoamer Solution
Standard Protocol for Industrial Sample Verification and Dispatch
System Parameter Submission
Provide data tracking your slurry fiber type, machine wire running speeds, white water loop temperatures, and active pH metrics.
Laboratory Formula Evaluation
Our pulp application lab reviews your tech profile to compile a target grade countertype sheet and volume quotation within 24 business hours.
Physical Sample Dispatch
Validated technical sample trial lots are shipped via expedited global freight lines to support immediate mill trial execution and dosage tracking.
