Sensor technologies along the entire paper and pulp production process

From forestry to packaging, Interface offers a wide range of sensor technologies that support all stages of production. Paper and pulp production support. The pulp and paper industry – one of the most important, highest-volume sectors in the field of natural ressources – relies on physical-mechanical orchestration, which is controlled by measurement data along the entire production chain.

Whether processing raw wood fibers in integrated plants, in specialized individual plants or in secondary fiber mills based on recycled waste paper – operational efficiency depends on precise force measurement.

The industrial footprint of the paper and pulp industry

Paper and pulp are deeply integrated into the global supply chain. Consumers and businesses rely heavily on all types of paper products. Interface load cells and force measurement systems provide the precise monitoring, weight measurement, and mechanical control necessary to keep these processing environments running safely.

The scale of the paper and materials manufacturing sector is enormous and directly anchors companies in numerous industries:

• Logistics and e-commerce: Demand is focused on corrugated cardboard boxes, shipping cartons, and protective paper fillers. These materials require high burst strength and structural compression testing to protect goods during transport.
• Consumer goods: The focus is on packaging, display boxes and labels where uniform thickness and precise coating applications are required.
• Building and construction: This sector supplies important materials directly to the construction industry, including gypsum board covering paper, asphalt-impregnated roofing paper, cellulose building insulation, and structural fiberboards for insulation and sheathing.
• Printing and publishing: These industries require graphic and writing papers that demand a uniform surface smoothness and stable handling.
• Healthcare and hygiene: These sectors rely on medical packaging, disinfectant wipes and paper towels – all products that require strict control during material batch processing.

Force measurement challenges in paper and pulp production

The process from raw wood or recycled paper to the finished paper product is characterized by high speeds, mechanical pressure, and demanding environmental conditions. Interface sensors act as monitoring points within these machines, helping to maintain control at every stage.

#1 – Raw material management and processing

Before paper can be formed, cellulose fibers must be separated from the wood through chemical or mechanical pulping. Interface load cells weigh incoming wood chips on conveyor belts and monitor caustic solution and chemical tanks to control mixtures. In secondary fiber mills, these weighing systems track the bulk quantities of waste material to control production ratios.

#2 – High-speed railway voltage control

Once the pulp is processed, it is transformed into a continuous paper web that runs at high speed through dozens of rollers. Consistent tension is essential to prevent tearing, wrinkling, or uneven thickness. Interface load cells continuously measure the web tension and feed the data into automated systems that adjust the roller speeds. If the tension deviates, the paper web can fail, leading to machine downtime.

#3 – Precision rollers and surface finishing

Passing the paper through specialized machines gives it its final surface and thickness. Sensors monitor the mechanical pressure at the point where two rollers meet—the so-called calender gap—to ensure a uniform thickness. In the case of coatings, sensors measure the precise pressure of the coating knives to prevent uneven distribution on the material.

#4 – Machine diagnostics and maintenance

Heavy mechanical equipment is susceptible to wear and tear. Torque measurement on screw presses and warehouse monitoring enable factories to detect friction or misalignment before a mechanical failure occurs.

#5 – Quality Assurance and Logistics

Before shipping, the materials are tested for paper tear strength and compressive strength using load cells to confirm they meet industry-standard durability requirements. Finished rolls are then safely prepared for shipping using integrated crane scales, forklift scales, and palletizing-specific force controls.

#6 – Reliability in harsh processing environments

Paper mills operate under demanding conditions characterized by humidity, continuous vibration, and exposure to chemicals. To withstand these influences, Interface supplies load cells with a robust design and sealed stainless steel housings. This design enables mills to implement automated process control systems that increase efficiency, reduce raw material consumption, and support compliance with environmental and safety regulations.

Application solutions for the paper and pulp industry

As the pulp and paper sector adopts higher automation standards, precise force measurement remains essential to maintain production control, improve material usage, and ensure safe operation.

Pulp refining is a critical step in papermaking. An industrial processing plant aims to optimize a multi-stage mixing and filtration process. Sensors are needed to weigh the settling tank during pulp refining and to monitor the screen arm during the mixing process. Simultaneously, the rotational resistance of the motor should be measured when solids accumulate during the refining process.

Interface recommended the use of 1200 Standard LowProfile™ Load Cells for weighing the settling tank. The Weighing results are sent to the 9890 Strain gauge load cells mV/V display unit This system measures inventory purely by mass, thus completely avoiding the inaccuracies of level sensors. T2 Ultra Precision shaft-type torque transducer The Interface device was installed directly in line with the drive shaft of the computing arm to measure the exact rotational resistance of the motor. The results are monitored in real time when the device is connected to the 9894 analog input process indicator The use of interface load cells improves process consistency and ensures optimal fiber preparation, resulting in stronger and more uniform paper. Improved force control reduces unnecessary energy consumption and lowers operating costs. Overload monitoring helps extend equipment lifespan and minimize downtime.

In the press area of ​​a paper machine Large rollers compress the paper web to remove water and form a uniform web. The correct roller force is crucial. Too little force can lead to poor web formation, while excessive force can damage fibers, cause web tears, or damage rollers and bearings. Without accurate force measurement at the roller bearings, operators cannot reliably control or balance the applied load – which is essential for reducing waste and improving operational efficiency.

Interface recommended installing PBLC2 pillow block bearing load cells as a direct replacement for standard pillow block bearings that support the press rollers. This sensor measures the force applied via the roller shaft in real time and protects components from overload. The data is transmitted wirelessly to the WTS-BS-6 Wireless Telemetry Dongle Base Station and  WTS-BS-1-HA Cordless Handheld Device The signal can be transmitted to multiple transmitters. Operators can maintain stable, controlled compression during the paper pressing process. They can monitor and limit excessive loads, prevent premature wear or damage to rollers and bearings, and improve the overall stability of the process.

Further paper and pulp applications with interface solutions

• Pulp dosing and batching systems
• Roller cradles
• Paper web tension measurement
• Press load monitoring
• Paper tear resistance & pressure test
• Weighing recycled paper & waste materials
• Calender roller gap pressure monitoring
• Spreading knife force measurement
• screw press torque measurement
• Alkali and chemical container fill level detection
• Conveyor belt scales & wood chip flow
• Forklift and crane scale integration
• Warehouse and structural load monitoring
• Palletizing & Packaging Force Control

The interface sensor toolkit for paper and pulp manufacturers and suppliers

Different production stages require specific force measuring tools:

• LowProfile load cells They are used for pressure and tensile testing, press load monitoring and high-load platform weighing.
• mini load cells They meet the requirements for confined installation situations that require precise force feedback, such as coating knife assemblies.
• Torque transducer are needed on rotating machines such as screw presses to monitor the motor torque and the mixing consistency.
• Load bolts and multi-axis sensors They are integrated into structural components, bearing housings and customer-specific machine connections to capture multidirectional forces.
• Instruments and wireless telemetry systems They transmit real-time force data from rotating components directly to control rooms, thus avoiding complex cabling in wet areas.
• Custom-designed OEM sensors are developed for the proprietary dimensions and environmental requirements of special-purpose machinery.

Why Interface is the trusted force measurement technology partner for modern paper mills

As the pulp and paper industry adopts higher automation standards, precise force measurement remains essential for maintaining production control, improving material utilization, and ensuring safe operation. Interface is a leading provider of load cells and sensor solutions for the pulp and paper industry, addressing the specific mechanical vulnerabilities found in modern mills, forestry operations, and converting and packaging machinery.

Paper converting machines operate under continuous cycles where even minor calibration deviations can lead to tons of material waste or catastrophic machine downtime. By supplying sensors that combine industry-leading measurement accuracy with specialized environmental protection, automated process control loops receive reliable data hour after hour. Furthermore, our application engineers work collaboratively to select appropriate sensor sizes, customize mechanical interfaces, and implement wireless telemetry systems that eliminate vulnerabilities. This deep technical support, coupled with our robust sensor designs, makes Interface an indispensable partner for optimizing throughput, protecting machinery, and meeting stringent safety standards across the entire manufacturing chain.