| 1. Pulp Handling & Steeping | Cellulose pulp preparation | Pulp conveyor and feed system, steeping tanks, caustic-liquor circulation equipment | Feeds dissolving-grade pulp and immerses it in sodium hydroxide solution to form alkali cellulose. | Confirm pulp format and capacity compatibility, corrosion-resistant materials, tank access for cleaning, and process-instrumentation scope. |
| 2. Pressing, Shredding & Aging | Alkali-cellulose preparation | Presses, shredders, enclosed aging vessels, temperature-control systems | Removes excess liquor, reduces the cellulose mass to crumbs, and controls aging before the next reaction step. | Review throughput, liquor drainage and handling, temperature control, dust containment, and integration with the plant’s batch or continuous process. |
| 3. Xanthation Systems | Cellulose chemical modification | Enclosed xanthation reactors, carbon disulfide dosing and containment systems, ventilation and safety interlocks | Reacts alkali cellulose with carbon disulfide to produce cellulose xanthate. | Assess sealed handling, hazardous-area design, leak detection, ventilation, operator protection, and provisions for carbon disulfide recovery. |
| 4. Dissolving & Mixing Equipment | Viscose preparation | Dissolvers, agitated mixing tanks, liquor dosing systems, transfer pumps | Dissolves cellulose xanthate in dilute sodium hydroxide to prepare viscose dope. | Check mixing uniformity, temperature control, sealing, pump suitability for viscous fluids, and compatibility with the required production rate. |
| 5. Ripening, Filtration & Deaeration | Dope conditioning before spinning | Ripening tanks, viscose filters, filter-change systems, vacuum deaerators | Conditions the dope and removes undissolved particles and entrained air that could disrupt spinning. | Verify filtration rating and area, continuous-operation options, cleaning procedures, vacuum performance, and monitoring of dope temperature and consistency. |
| 6. Spinning & Coagulation Lines | Filament formation | Metering pumps, spinnerets, spinning cabinets, coagulation baths, bath-circulation and control systems | Extrudes viscose through spinneret openings into an acidic coagulation bath, forming regenerated cellulose filaments. | Match line design to filament type and output; check spinneret handling, bath-control capability, maintenance access, and product-changeover requirements. |
| 7. Fiber Finishing & Plant Support | Post-spinning treatment and plant services | Washing and desulfurization equipment, bleaching or finishing units where specified, dryers, cutters, balers, liquor-recovery and wastewater-treatment systems | Processes spun fiber for its intended form and specification; supporting systems can help manage process liquors, emissions, and wastewater. | Clarify which finishing steps are required for the product, water and energy consumption, emissions-control scope, wastewater interfaces, and the boundary of supplier responsibility. |