# Raumatech

> Paper-machine field service, spare-parts supply chain and roll engineering for the pulp & paper industry. Raumatech combines 20 years of roll and on-site service experience with a traceable supply-chain data center built on real transaction records (purchase, quote, fulfillment, service) — so every spare-parts recommendation is backed by data, not guesswork. Based in Jiangsu, China (Yangtze River Delta manufacturing base); serving China, Asia-Pacific and overseas projects.

All content on this site is available in 14 languages (en, zh, fr, es, pt, ru, ja, th, vi, ms, id, ar, bn, ko). English pages carry `?lang=xx` variants and hreflang alternates. AI crawlers and LLMs are welcome to read, index and quote this site freely; attribution to Raumatech is appreciated but not required.

## Core Services
- [Field Service](https://raumatech.com/field-service.html): Commissioning, run-failure diagnosis, emergency repair, roll-position modification, vibration / temperature / dehydration troubleshooting, operator and maintenance-team training.
- [Roll Engineering](https://raumatech.com/roll-engineering.html): Grinding and balancing, re-covering, bearing and journal repair; vacuum-roll and Yankee-dryer drilling; CFRP roll shells designed by classical laminate theory and verified by finite element analysis.
- [Carbon-Fiber Rolls](https://raumatech.com/carbon-fiber-rolls.html): CFRP guide rolls with 60% weight reduction versus steel, CLT-based design and FE verification.
- [Spare Parts](https://raumatech.com/spare-parts.html): OEM-equivalent parts, domestic substitutes, roll-specific components and consumables, recommended against actual working conditions and fully traceable.
- [Supply Chain Intelligence](https://raumatech.com/supply-chain.html): A supply-chain data center for supplier–customer matching verification on real transaction records, not AI guesswork. Starting categories: rolls, seals, screens, refiners, doctor blades.

## How We Work
- Diagnosis is based on measured data; recommendations are based on calculation; every delivery comes with a written report. No arithmetic, no conclusion.
- Behind every quotation is a live data core: supplier capability registry and real transaction ledger as dual engines, entity-key bridging, supplier lifecycle state machine. Every conclusion carries evidence and is auditable.
- Inquiry response within 48–72 hours; S-class stocked items delivered in 2–4 weeks; shop tolerance standard ±0.05 mm; delivered substitutes save 13–62% versus European OEM.

## Technical Articles

### Paper's Depth · Ten Lectures on Papermaking Technology
Ten-part series on the physics of papermaking: fiber morphology, kraft pulping, mechanical pulps, bleaching, refining and wet-end chemistry, forming and dewatering, pressing and drying, sizing / coating / finishing, and recovered fiber.

- [EP01 · The Nature of Paper](https://raumatech.com/tech/paper-deep-dive/01.html): The physics of a fibrous network: a sheet's strength does not come from "glue" but from billions of hydrogen bonds between adjacent fibers. This episode starts at the reel and takes apart why a pile of cellulose fibers becomes "paper".
- [EP02 · Raw Materials: Wood, Fibers and Pulp Selection](https://raumatech.com/tech/paper-deep-dive/02.html): Fiber morphology, chemical composition, the logic of choosing among five pulp families
- [EP03 · Chemical Pulping: The Kraft Process](https://raumatech.com/tech/paper-deep-dive/03.html): White liquor, the three delignification stages, the H-factor, the closed caustic-recovery loop
- [EP04 · Mechanical and Chemi-mechanical Pulps](https://raumatech.com/tech/paper-deep-dive/04.html): The SGW→TMP→CTMP lineage and the energy–strength trade-off
- [EP05 · Washing, Screening and Bleaching](https://raumatech.com/tech/paper-deep-dive/05.html): Oxygen delignification, ECF/TCF sequences, the AOX balance
- [EP06 · Refining and Wet-end Chemistry](https://raumatech.com/tech/paper-deep-dive/06.html): SEL, the refining-degree vs. property curve, Zeta potential, three generations of retention aids
- [EP07 · Forming and Dewatering on the Wire](https://raumatech.com/tech/paper-deep-dive/07.html): The headbox, the vacuum sequence, fourdrinier vs. twin-wire
- [EP08 · Pressing and Drying](https://raumatech.com/tech/paper-deep-dive/08.html): Plain roll → shoe press, the three drying stages, the energy balance
- [EP09 · Sizing, Coating and Finishing](https://raumatech.com/tech/paper-deep-dive/09.html): Film-transfer sizing, coating formulations, soft calendering
- [EP10 · Recovered Fiber and Printability (Finale)](https://raumatech.com/tech/paper-deep-dive/10.html): OCC/DIP, stickies, printability, a full ten-episode recap

### Paper Machine O&M — Sixteen Lectures
Systematic paper-machine operation, maintenance and spare-parts knowledge, organised as sixteen lectures across four volumes.

- [M00 · Paper Machine O&M — System Map](https://raumatech.com/tech/paper-om/m00.html): Operation · Maintenance · Spare parts — a paper-machine O&M knowledge system organized by paper grade. Four parts: Common foundation → Utility systems → Grade-specific volumes → Management loop
- [M01 · Mechanical Maintenance Methodology](https://raumatech.com/tech/paper-om/m01.html): Downtime loss ledger · BM/PM/CBM three strategies · Five-sense & instrument inspection · RCFA and the three-column fault table. The foundation of every grade-specific volume: establish the method first, then discuss the machine.
- [M02 · Roll & Special-Roll O&M](https://raumatech.com/tech/paper-om/m02.html): Roll-family map · Shoe-press working principle · Suction-roll sealing & shell · Covering crown & grinding · Bearing fit & dynamic balancing. A paper machine has two to three hundred rolls, each carrying
- [M03 · Wet-End O&M](https://raumatech.com/tech/paper-om/m03.html): Headbox lip & cavity · Forming-fabric & felt life management · Guide-valve calibration · High-pressure water & chemical cleaning · Vacuum-system troubleshooting order. The nature of wet-end maintenance: periodic management of five consumable types + a bunch of millimeter-level clearances.
- [M04 · O&M Panorama](https://raumatech.com/tech/paper-om/m04.html): Line map & dryness ladder · Capacity & availability three rates · Downtime structure · Speed chain & bottleneck · Energy per tonne · Position index. Understand how the whole machine runs before discussing how to repair it.
- [M05 · Safety & Work Procedures](https://raumatech.com/tech/paper-om/m05.html): Energy model & three entry points · LOTO six energies · Nip map · Confined-space four-piece kit · Steam & dryer cylinder · Chemicals · Permit & signage. Safety is not a chapter, it is the precondition of all work.
- [M06 · Spare Parts](https://raumatech.com/tech/paper-om/m06.html): Stockout cost & holding cost · ABC/XYZ classification · safety stock & reorder point · BOM reverse-derivation ledger · five-step localization verification · framework agreements for long-lead parts. Spare parts are not inventory in a warehouse; they are a hedge against downtime risk.
- [M07 · Hydraulics & pneumatics](https://raumatech.com/tech/paper-om/m07.html): Hydraulic power unit & oil cleanliness · press loading circuit · accumulator pre-charge · pneumatic FRL & ejector · fault tree & seal management. The most easily overlooked yet most fatal lecture in the utility systems: about 80% of hydraulic failures can ultimately be traced to dirty oil.
- [M08 · Air system & ventilation](https://raumatech.com/tech/paper-om/m08.html): Hood supply/exhaust balance · pocket ventilation · exhaust heat recovery · Mist/Dust removal · fan & valve inspection. Every 1 ton of water evaporated in the dryer section must be carried away by air as the "carrier" — unbalanced airflow and paper defects and energy use explode together.
- [M09 · Automation & drive](https://raumatech.com/tech/paper-om/m09.html): DCS / QCS architecture · drive sections & speed chain · web-break detection & auto-slowdown · reading the IO list · PID tuning · configuration backup & permissions. Modern paper machines integrate "machine, electric, instrument, software"; once control and drive fail, the whole line is harder to locate than a mechanical fault.
- [M10 · Graphic Paper · Dry End & Finishing](https://raumatech.com/tech/paper-om/m10.html): Dryer groups & drying curve · condensate system · size press & calender · three-stage reel & threading · dry-end defect mapping Graphic paper is the baseline machine for the grade-specific volumes: multi-cylinder drying, two-sidedness control, the most complete finishing section — understand it and board and tissue are just parameter shifts.
- [M11 · Board machine O&M](https://raumatech.com/tech/paper-om/m11.html): Multi-layer forming (top / liner / core / back) · basis-weight change and ply bonding · coating preparation & delivery · board-machine dryer section and large dryer cylinders · containerboard defect mapping. Board (containerboard, kraftliner, white board) relies on
- [M12 · Tissue machine O&M](https://raumatech.com/tech/paper-om/m12.html): Yankee dryer safety · coating and creping blade · high-temperature high-speed hood · crepe quality (MD/CD stretch) · dust shedding. The tissue machine is the grade with the largest form difference: no multi-cylinder, no conventional reel, almost
- [M13 · Pulp line & stock prep](https://raumatech.com/tech/paper-om/m13.html): Repulping · refining and refiner plates · screening (pressure screen) · cleaning & purification · washing & thickening · white-water loop · pump and piping wear. Whether graphic paper, board or tissue, ahead of the machine
- [M14 · Finishing section & roll logistics](https://raumatech.com/tech/paper-om/m14.html): Rewinding / sheeting / packing · reel-module comparison · defect tracing back to workstation · warehousing & logistics · broke recirculation · finishing-section safety. What the machine outputs is
- [M15 · Shutdown maintenance project management](https://raumatech.com/tech/paper-om/m15.html): Shutdown plan · work packages (job / material / tool / risk) · as-built documentation system · schedule and safety control · start-up verification checklist. Back from the Part C grades to
- [M16 · Grade Comparison & Knowledge Map](https://raumatech.com/tech/paper-om/m16.html): Cross-grade O&M difference master table · Spare-parts interchangeability matrix · Personnel competency map · Full-lecture index and lookup paths · O&M maturity ladder The final lecture adds no new knowledge points; instead it puts the previous fifteen lectures

## Technical Library
Maintenance and overhaul procedure guides for pulp and paper equipment, each with process steps, acceptance criteria and site photographs from real jobs.

### Pulping & Stock Preparation
- [Stock Preparation System Maintenance](https://raumatech.com/library/pulping-00-stock-preparation.html): Refiners, pressure screens, cleaners and pulpers — fill changes, rotor gaps, seal water and vibration control.
- [Continuous Cooking System Maintenance](https://raumatech.com/library/pulping-01-continuous-cooking.html): Chip meters, HP feeders, top separators and blow units — running-clearance control and taper-face restoration.
- [Defibrator / Refiner Overhaul](https://raumatech.com/library/pulping-02-defibrator.html): Plug-screw feeders, fillings, cartridge bearing units and mechanical seals — drive-up mounting at ≈ 200 bar end pressure.
- [HC Refining Maintenance](https://raumatech.com/library/pulping-03-hc-refining.html): High-consistency refining overhauls — filling exchange, cartridge bearings, seal direction and dial-gauge alignment.
- [Wash Press Maintenance](https://raumatech.com/library/pulping-04-wash-press.html): Twin-roll press-nip washing — roll surfaces, doctor fitment, nip shimming, end seals and hydraulic checks.

### Paper Machine Equipment
- [Headbox Maintenance & Overhaul](https://raumatech.com/library/papermaking-00-headbox.html): Horizontal CD basis weight control and jet stability — lip replacement, apron repair, profile zeroing and alignment.
- [Calender Stack & Loading Mechanism Overhaul](https://raumatech.com/library/papermaking-01-calender.html): Thermal finishing nip restoration — roll surface repair, pivot-point overhaul, hydraulics and sensor recalibration.
- [Coater Head & Size Press Overhaul](https://raumatech.com/library/papermaking-02-coater-sizepress.html): Application-beam straightness, seal renewal, zero-position calibration and backing-roll surface recovery.
- [Winder — Unwind, Slitting & Reeling Sections](https://raumatech.com/library/papermaking-03-winder.html): Unwind stations, slitting units, reeling drums and paper-transfer mechanisms — rails, blade seats and drums restored.
- [Pope Reel — Primary / Secondary Take-Up](https://raumatech.com/library/papermaking-04-reel.html): Reel drum, primary/secondary arms, rail carriages and center-wind drive — alignment, hydraulics and change sequence.
- [Yankee Dryer Surface & Creping Blade](https://raumatech.com/library/papermaking-05-yankee.html): Yankee crown grinding, chattermark removal, thermal-spray recoating and creping-blade geometry restoration.
- [Press & Dryer Sections Overhaul](https://raumatech.com/library/papermaking-06-press-dryer.html): Press rolls and shoe units, dryer cylinders, steam & condensate systems — surfaces, doctors, seals and bearings.
- [Hood, Hot Air & Heat-Recovery Systems](https://raumatech.com/library/papermaking-07-air-systems.html): Wet-end ventilation, dryer supply/exhaust air and heat recovery — leakage, fouling and airflow balancing.

### Wood Handling & Fiber Systems
- [High-Pressure Feeder 900L Overhaul](https://raumatech.com/library/fws-00-hp-feeder-900l.html): Rotor-to-sleeve taper fit restoration — sandblasting, NDT, taper build-up welding, machining and drive-up bearing assembly.
- [Top Separator — Screen Body & Screw Overhaul](https://raumatech.com/library/fws-01-top-separator.html): Screen-basket geometry recovery by hydraulic rounding, screw-facing TIG build-up and PT verification.
- [Feed Chute Remanufacturing](https://raumatech.com/library/fws-02-feed-chute.html): Base-plate and nose rebuild with 316L / tungsten-carbide cross welding, CNC machining and -1° to -2° fitting allowance.
- [Chipper Disc Repair](https://raumatech.com/library/fws-03-chipper-disc.html): Disc-face machining back to standard thickness (215.95→220 mm), NDT, build-up of worn pockets and full re-assembly.
- [Rechipper Repair](https://raumatech.com/library/fws-04-rechipper.html): Complete disc-group renewal, weld repair of hood and discharge, keyway machining and full repaint.
- [Chip Screen Repair (Option A: Repair / Option B: Replace)](https://raumatech.com/library/fws-05-chip-screen.html): Screen deck and legs restored or remade — grinding-cut only, press straightening, ASME P-No.1 electrodes and RAL 5017 finish.

### General & Mill Utilities
- [Wire & Felt Tensioners, Correctors & HP Showers](https://raumatech.com/library/general-00-fabrics-equipment.html): Tensioning, guiding and on-line cleaning of forming fabrics, press felts and dryer fabrics — pneumatic / hydraulic / electromechanical.
- [Shoe Press & Extended-Nip Press — On-Site Service](https://raumatech.com/library/general-01-shoe-press.html): Hydraulic power unit, shoe assembly and lubrication metering manifold — on-site press-nip overhaul.
- [Dryer / Yankee On-Site Grinding & Thermal Spray](https://raumatech.com/library/general-02-cylinder-grinding.html): In-place mirror grinding, chrome-free thermal-spray coating and patch repair of dryer and Yankee surfaces.
- [Pulp Sheet Dryer Overhaul](https://raumatech.com/library/general-03-pulp-dryer.html): Air towers, circulation fans, steam coils, wire belts and cutters — hot-air convection drying line service.
- [Causticizing & White Liquor Preparation](https://raumatech.com/library/general-04-causticizing.html): Slaker, grits classifier, disc filter, agitators and lime-slurry tanks — filter cloth, drums and corrosion control.
- [Lime Kiln Overhaul & Axis Alignment](https://raumatech.com/library/general-05-lime-kiln.html): Kiln shell, tyres, support rollers and thrust rollers — laser axis alignment, refractory and burner service.
- [Chipping, Chip Screening & Belt Drying](https://raumatech.com/library/general-06-chipping.html): Chippers, chip screens, belt dryers and feed drums — knife discs, blades, bearings and screening surfaces.
- [Boiler Heating-Surface Inspection (CFB / Pulverized / Biomass)](https://raumatech.com/library/general-07-boiler-inspection.html): Water walls, superheaters, reheaters and economizers — visual survey, thickness mapping and NDT with a formal inspection report.

## Company & Contact
- [About Us](https://raumatech.com/about.html): Founded by engineers trained in a European paper-machine OEM service organization, backed by a ~90-person Yangtze River Delta non-standard roll manufacturing base.
- [Contact / Request a Quote](https://raumatech.com/contact.html): Info@raumatech.com · +86 138 0151 0522 · Jiangsu, China

## Facts for LLMs
- Industry: pulp & paper; paper-machine field service; spare-parts supply; roll engineering.
- Service area: China and Asia-Pacific, with overseas project experience (Sweden, Poland, UK engineering resources; Southeast Asia, Middle East, Latin America).
- Differentiation: field service + roll engineering + spare-parts supply chain + data core on a single responsibility channel; supplier–customer matching backed by real transactions.
- Machine-readable companions: `/sitemap.xml` (64 URLs with hreflang alternates), `/llms.txt` (this file), `/llms.zh.txt` (Chinese edition), `/llms-full.txt` (full-text index).
- Note: cross-page statistics (supplier counts, category coverage) update live from the data core. The public line stays "real transaction records + 20 years of experience" — no inflation, no invention.