Yankee Hoods
Paper and tissue production lines can benefit from MDS expertise in the engineering, design, development and manufacture of performant Yankee Hoods that can be classified in 2 families of products better known under the generic names of MG Hoods and Tissue Yankee Hoods. Here below are some of the main features that demonstrate MDS’ strategy towards innovation and reliability.
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| Coated board MG Hood | Reconstituted tobacco Yankee Hood |
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| Survey & revamping for Tissue Machines | |
HOOD DESIGN
- Heavy-duty stable frame ensuring extended and stable performance and taking care of Yankee dryer surface
- Design distance 30 mm from Yankee, the best efficiency vs. safety
- Design distance 30 mm from Yankee, the best efficiency vs. safety
- High-insulation and waterproof panels for extreme operating dew point and minimal energy consumption
- Fine and regular tuning of air flows spread in both CD and MD, including manually balanced air dampers and primary ducts (CD pitch ≤ 1000)
- Gentle exhaust repartition avoiding web sucking and take-off everywhere around the active area
- SMARTAIRTM nozzles concept (Air knives), the only one offering the highest drying rates compared to similar equipments available, and giving versatility to follow up machines' evolution to meet markets' demand
- High efficiency fans driven by frequency variators for minimal electricity consumption
- Wide doors easily accessible from walkways for inspection, cleaning and eventual inside maintenance
- Perfect air balance whatever machine speed; no migration of air in both MD & CD; no hot air loss at dry end, nor hazardous and penalizing fresh air introduction on both edges and wet-end side
- Fire detection and steam extinguishing system taking care of your machine
ENERGY SOURCES
- MG hoods: steam heated or gas heated
- Tissue hoods: gas heated in regards to operating temperature
Special features
- MG hoods: steam heated or gas heated
- Moisture Control System controlling and adjusting exhaust flow (by oxygen rate measurement)
- Basic, extended or full Heat Recovery System providing up to 80% re-utilization of Hood consumption
- HR exchanger for make-up air warm-up allowing the re-use of Yankee dryer condensates
- Special heating sources on request (electricity – thermal oil – fuels – gas turbine fumes)
- MG or Aircap hoods, naked or combined with a fabric wire
- Cascade Air System for medium or extreme capacity machines
- Single or Twin Direct Air System according to air flux requirements
- Engineering for energy optimization
- Survey, assistance and revamping of existing installations
Technical solutions
Capitalizing on more than 50 years of know-how and experience in hood technology, MDS is a full-scope supplier of reliable equipments dedicated to paper and tissue mills, and a well-known provider of state-of-the-art solutions.
MDS Hoods are suitable for any production and machine speed; they offer better energy consumption rates than any other equipment available on the market.
The design of SMARTAIR™ nozzles gives a higher heat transfer up to 20% compared to all other hoods, and allows to decrease the operating temperature by up to 50 to 80°C for the same production. As a result, heat consumption reduction can reach up to 6% of total heat demand (steam + gas) or up to 10% of gas consumption.
The above figures are only some of the benefits that MDS can guarantee and which depend on each case study.
Temperature levels drive the choice of the materials used in hood construction:
- Aluminum nozzles for MG hoods up to 200°C (maximal permanent service temperature 300°C)
- Stainless steel for class “B” and class “S” tissue hoods (up to 450°C)
- Corten for class “H” extreme performance tissue hoods (up to 650°C
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