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Gerd Wolff Push-Pull Pickling Lines are engineered for the efficient and controlled removal of mill scale, oxides, and surface impurities from hot-rolled steel strip. Designed for flexible coil-by-coil processing, our systems combine advanced pickling technology, precise strip handling, acid management, rinsing, drying, trimming, recoiling, and integrated automation into a complete industrial processing solution.
Push-Pull Pickling Lines provide an effective solution for steel producers and service centers requiring flexible processing of different coil dimensions, material grades, and strip thicknesses. Each coil is individually processed through the pickling section, allowing rapid changes between different production requirements without the need for continuous strip welding.
Each line is engineered according to the material grade, strip thickness, strip width, coil weight, required production capacity, pickling chemistry, line speed, and finished coil requirements.
The primary objective of the pickling process is to remove surface oxides and mill scale generated during hot rolling, producing a clean and chemically prepared steel surface for subsequent processes such as cold rolling, coating, galvanizing, or other downstream operations.
Gerd Wolff Push-Pull Pickling Lines can utilize controlled hydrochloric acid pickling systems with optimized circulation, temperature, concentration, and strip contact conditions.
High-turbulence and shallow-tank pickling technologies can be implemented to improve acid utilization, reduce pickling time, and provide consistent surface quality.
The complete process is controlled to maintain stable pickling conditions while minimizing acid consumption and ensuring repeatable strip surface quality.
Gerd Wolff Push-Pull Pickling Lines are designed as fully integrated industrial systems combining mechanical equipment, process equipment, hydraulic systems, electrical engineering, instrumentation, and automation.
The automation system coordinates coil handling, strip feeding, pickling, rinsing, drying, trimming, tension control, recoiling, and coil unloading.
PLC-based control and HMI systems provide operators with real-time access to process parameters, production recipes, equipment status, alarms, diagnostics, and production information.
Advanced process monitoring can be implemented for acid temperature, concentration, circulation, strip speed, strip tension, rinse water flow, exhaust systems, and other critical operating parameters.
The production process begins with coil loading onto the entry coil car or receiving system.
The hydraulic or mechanically driven uncoiler provides controlled strip feeding into the process section while maintaining stable strip alignment.
Before entering the pickling section, the strip can pass through flattener, pinch-roll, guiding, and entry shear systems.
These components prepare the strip for stable movement through the process section and ensure reliable strip threading.
The strip is individually processed through the pickling tanks under controlled push and pull operation.
Unlike continuous pickling lines, push-pull systems process individual coils without requiring the strips to be welded into a continuous endless strip. This provides high flexibility for different coil sizes, grades, and production sequences.
The pickling section can incorporate multiple acid tanks with controlled acid circulation and heating systems to maintain the required process conditions.
The acid management system maintains the required concentration, temperature, and circulation conditions throughout the pickling process.
Continuous monitoring and controlled circulation help achieve consistent scale removal while optimizing chemical consumption.
Acid management can include circulation pumps, heat exchangers, filtration, concentration monitoring, storage tanks, and associated process-control equipment.
After the pickling process, the strip passes through a multi-stage rinsing system to remove residual acid and dissolved contaminants from the strip surface.
Spray or cascade rinsing systems can be configured according to the material and required surface quality. Multi-stage rinsing is commonly used to improve cleaning effectiveness and reduce chemical carryover.
Following rinsing, the strip is dried using controlled air-knife or hot-air drying systems.
The drying section removes residual water from the strip surface and prepares the material for subsequent processing, inspection, oiling, or recoiling.
When required, side trimming equipment can remove unwanted strip edges and establish the required final strip width.
High-precision side trimming systems can be integrated with automatic knife-gap adjustment and scrap handling systems to maintain consistent trimming quality.
After the pickling and finishing stages, the cleaned strip is recoiled under controlled tension.
Tension reels, bridle rolls, EPC systems, and coil handling equipment can be integrated to provide stable strip tracking and uniform finished coils.
Every Gerd Wolff Push-Pull Pickling Line is engineered around the customer’s specific production requirements.
Key design parameters include:
Material grade and mechanical properties
Strip thickness
Strip width
Maximum coil weight
Coil inner and outer diameter
Required pickling capacity
Line operating speed
Acid type and concentration
Pickling temperature
Required surface quality
Rinsing requirements
Drying requirements
Side trimming requirements
Recoiling requirements
Environmental and exhaust requirements
Automation and process-control requirements
This engineering-driven approach allows the complete process section and auxiliary systems to be optimized for the customer’s production range and operating conditions.
Flexible coil-by-coil processing
High-efficiency pickling technology
Controlled acid circulation
Acid temperature and concentration management
High-turbulence pickling systems
Multi-stage rinsing
Controlled strip feeding
Precision strip guiding
Entry and exit shear systems
Air-knife / hot-air drying
Side trimming systems
Scrap edge handling
Tension-controlled recoiling
EPC strip alignment
Fume extraction and exhaust systems
PLC-based line automation
HMI and recipe management
Real-time process monitoring
Alarm and diagnostic functions
Integrated safety and interlock systems
Customized coil handling solutions
Pickling operations require controlled management of acids, fumes, rinsing water, and process chemicals.
Gerd Wolff Push-Pull Pickling Lines can incorporate enclosed or covered process sections, fume extraction, exhaust treatment, controlled chemical circulation, and monitoring systems designed to support safe and environmentally responsible operation.
Negative-pressure exhaust systems and fume collection can be integrated to minimize the release of acid vapors into the working environment. Modern pickling technologies also focus on optimizing acid consumption and reducing process emissions.
Automation is a critical component of modern Push-Pull Pickling Lines.
The control architecture can monitor and coordinate:
Strip speed
Strip tension
Acid temperature
Acid concentration
Acid circulation
Rinse water flow
Strip position
Coil diameter
Recoiler torque
Hydraulic pressure
Exhaust system status
Drying temperature
Production quantity
Equipment status
Alarm and diagnostic information
PLC-based control systems synchronize the entry, process, and exit sections to provide stable material movement and repeatable process conditions.
HMI systems provide operators with intuitive access to recipes, process parameters, trends, alarms, diagnostics, and production information.
Gerd Wolff Push-Pull Pickling Lines can be configured according to the required production process.
A flexible coil-by-coil processing system designed for efficient removal of mill scale and surface oxides from hot-rolled steel.
An integrated configuration combining pickling with precision side trimming and scrap edge handling for controlled finished strip width.
A complete process configuration including pickling, rinsing, drying, tension control, and recoiling for finished pickled coils.
A process line incorporating leveling or scale-breaker equipment to improve strip shape and facilitate more efficient pickling.
From mechanical engineering and manufacturing to process engineering, electrical design, automation, commissioning, and after-sales service, Gerd Wolff provides complete engineering solutions for Push-Pull Pickling applications.
Our systems can be configured with customized entry, pickling, rinsing, drying, trimming, tensioning, recoiling, exhaust, and chemical management equipment according to the customer’s requirements.
The result is a robust and highly integrated Push-Pull Pickling Line designed to deliver efficient scale removal, consistent surface quality, flexible coil processing, optimized chemical consumption, and reliable long-term industrial performance.
Combining decades of engineering experience with modern manufacturing capabilities to develop reliable machinery for demanding industrial applications.
From individual machines to complete production solutions, we develop and manufacture equipment tailored to your process and production needs.
High-quality materials, precision manufacturing and rigorous quality control ensure dependable performance and long service life.
From engineering and assembly to commissioning and after-sales support, we stand beside our customers throughout the entire project lifecycle.
