PULP & PAPER INDUSTRY – CHAIN CONVEYING SYSTEMS & COMPONENTS
Woodyard & Chip Handling
Apron Feeders for Wood Chips / Logs
Purpose: Controlled feed of logs or wood chips from truck dumpers or silos to screening or chipping units.
Chain Type: Drop-forged link chain with wide apron pans.
Design Features:
Pan width: 800–2000 mm (Higher customizable sizes available).
Chain pitch: 160 mm / 200 mm / 250 mm (Higher customizable sizes available).
Pans with anti-jam cutouts and curved edges.
Capacity: 200–800 TPH (Higher customizable parameters available).
Chip Reclaimers
Purpose: Automated chip recovery from radial piles or silos.
Chain Type: Twin-strand forged chain with scraper flights.
Specs:
Flights made of AR steel or UHMWPE-laminated bars.
Slow-speed operation with self-cleaning design.
Drag Chain Conveyors (Green Chips / Oversize Transfer)
Function: Horizontal or inclined transfer from screening to silo or metering bin.
Chain Type: Drop-forged steel chain with fixed or articulated flights.
Extras:
Overflow chutes and inspection hatches.
Optional bin activators at discharge end.
Pulping Area (Digester Feed & Washing)
Bucket Elevators (Dry / Moist Chip Elevation)
Purpose: Elevating washed or dry chips to digester or soaking tanks.
Chain Type: Central forged chain or round link bucket elevator chain.
Design Highlights:
Height: 15–40 m (Higher customizable sizes available).
Buckets with curved profile for chip containment.
Self-cleaning bottom pulleys.
Chemical Feeding Conveyors (Lime, Caustic Soda)
Purpose: Dosing powdered additives to digesters or mixers.
Chain Type: Forged scraper chain in enclosed trough.
Features:
Designed to eliminate buildup.
Anti-static and corrosion-resistant liners available.
Stock Preparation & Trim Handling
Trim Conveyors (Broke & Edge Waste)
Function: Conveying paper edge trims, reject sheets, broke to repulper.
Chain Type: Flat-top drag chain or steel hinged chain.
System Details:
Built-in tensioners.
Floor-level or mezzanine-mounted systems.
Optional diverter gates for dual discharge points.
Drag Chain Conveyors (Rejects & Screen Residue)
Function: Disposal of heavy rejects like plastic, metal wires, sand.
Chain Type: Forged steel drag chains with open flight paddles.
Design:
Trough liners for abrasive residue.
Screw–chain hybrid versions also available.
Recovery Boiler, ESP, and Ash Handling
Flow Conveyors for ESP Dust
Purpose: Transfer dry fly ash from recovery boiler baghouse to silo.
Chain Type: Drop-forged scraper chain with minimal spillage clearance.
Specs:
Chain pitch: 142–200 mm (Higher customizable sizes available).
Air-tight casings.
Optional nitrogen blanketing for explosive dust control.
Submerged Scraper Conveyor (for Ash Hopper Discharge)
Chain Type: Forged twin-strand scraper chain.
Usage: Bottom ash discharge from smelter units or biomass boilers.
Materials: Heat-resistant alloy steel for wet, hot ash environment.
Final Storage & Dispatch
Silo Discharge Chain Conveyors
Purpose: Controlled discharge of chips, ash, lime, or pulp powder to truck loaders or screw feeders.
Chain Type: Central drag chain or dual-strand paddled chain.
Options:
Variable pitch for metered flow.
Integration with telescopic spouts.
TYPICAL CHAIN TYPES USED IN PULP & PAPER MILLS
| Chain Type | Applications | Key Characteristics |
| Drop-Forged Link Chain | Apron feeders, drag conveyors | Durable, shock and chip-resistant, up to 600 TPH |
| Central Chain | Bucket elevators, silo discharges | Accurate pitch, high-lift strength |
| Round Link Chain | Dusty chip elevators, boiler dust handling | DIN 764/22252 compliant, low maintenance |
| Flat Top Chain | Trim conveyors, edge handling | Smooth top surface, low-noise operation |
| Scraper Chain (Twin Strand) | ESP/ash discharge, submerged scraper conveyors | High torque, continuous operation in wet/abrasive conditions |
CONSTROMECH ADVANTAGES IN PULP & PAPER INDUSTRY
- Chains forged and machined from Cr-Mn or 35CrMo4 alloy steels, case hardened for longevity.
- Buckets, pans, and scrapers available in MS, Hard plates up to 550BHN, or UHMWPE-clad versions.
- Chain & sprocket assemblies designed for non-stop, high-moisture, fibrous environments.
- Retrofits and reverse engineering for OEM equipment compatible sizes.
- Silent blocks, adjustable tensioners, take-up guides, and pre-assembled elevator kits available.