{"id":13191,"date":"2018-06-08T09:52:24","date_gmt":"2018-06-08T13:52:24","guid":{"rendered":"https:\/\/cnr.ncsu.edu\/fb\/?page_id=13191"},"modified":"2025-06-02T20:59:49","modified_gmt":"2025-06-03T00:59:49","slug":"pulping-technical-services","status":"publish","type":"page","link":"https:\/\/cnr.ncsu.edu\/fb\/facilities-and-services\/pulping-technical-services\/","title":{"rendered":"Pulping Technical Services"},"content":{"rendered":"\n\n\n\n\n
The mission of the Pulp and Paper Technical Services program is to support our allied industries with high quality, cost-effective services. From small-scale laboratory testing to pilot-scale production of large quantities of pulp or paper from a variety of sources, we are well-equipped for almost any technical challenge related to pulping and pride ourselves on a total customer focus.<\/p>\n\n\n\n
With a large number of digesters, ranging from 0.03-845 gallons (100 ml to 3200 liters), we are well equipped to conduct studies on a variety of materials. Typical activities include furnish studies, pulping optimization, comparison of different processes, and digester additives evaluation.<\/p>\n\n\n\n
Pulping studies are conducted on both traditional and alternative wood furnishes. A variety of non-wood raw materials are also studied, including agricultural residues (corn stalk, rice, and wheat straw) and fiber crops (kenaf, hemp, and sisal.)<\/p>\n\n\n\n
M&K 2.5-gallon (10-liter) Batch Digesters<\/strong><\/p>\n\n\n\n Number available: 4<\/p>\n\n\n\n Capacity: up to 1200 grams of dry wood chips per batch<\/p>\n\n\n\n Features:<\/p>\n\n\n\n NC State 0.8-gallon (3-liter) Pressure Bombs for Cooking or Bleaching<\/strong><\/p>\n\n\n\n Number available: 6<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Capacity: 200 grams dry chips, 200 grams medium- to high-consistency pulp<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Process options:<\/p>\n\n\n\n Paprican-Designed 3-gallon (11.4 liter) Batch Digester with Internal Moving Fingers<\/strong><\/p>\n\n\n\n Capacity: 1.1 OD lb (500 OD grams) of medium- or high-consistency pulp; 250-400 AD grams of bulky non-wood material<\/p>\n\n\n\n Construction: 316 SS lined with Teflon<\/p>\n\n\n\n Features:<\/p>\n\n\n\n This reactor is well-suited for medium- or high-consistency bleaching of pulp with a variety of agents, including oxygen. The reactor is also an excellent bench-scale digester for nonwood materials. The fingers provide a lifting and turning action similar to a screw-type digester.<\/p>\n\n\n\n 7.5-gallon (28-liter) Hot-Blow Digester<\/strong><\/p>\n\n\n\n Capacity: 20 lb (9 kg) dry chips<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n 13-gallon (50-liter) Cold-Blow Batch Digester System<\/strong><\/p>\n\n\n\n Number available: 4<\/p>\n\n\n\n Construction: electropolished 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n 7.5-gallon (28-liter) Direct-Steamed Rotary Batch Digester\/Reactor<\/strong><\/p>\n\n\n\n Capacity: 15 dry pounds chips or 5-6 dry pounds bulky nonwood materials<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n This vessel can be used for cooking or for bleaching at medium or high consistency.<\/p>\n\n\n\n 40-gallon (150-liter) Vertical, Screw-fed, Continuous Digester with Refiner Discharge<\/strong><\/p>\n\n\n\n Capacity: up to 3 tons\/day on wood; less on bulky non-woods<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n This unit can be used for continuous production of chemical or semi-chemical pulp, as long as the process permits short retention times and some degree of refining at the discharge. On non-woods, the unit can be made to run like a screw-type digester. The unit has been run successfully on corn stalk, wheat straw, hemp, and kenaf.<\/p>\n\n\n\n Mechanical pulping trials may include RMP (refiner mechanical pulping), CMP (chemimechanical pulping), TMP (thermomechanical pulping), or CTMP (chemithermomechanical pulping). Semi-chemical pulping may also be carried out.<\/p>\n\n\n\n For small-scale or screening trials, the KRK Pressurized Laboratory Refiner may be used, with batch sizes 1-5 lb (0.5-2 kg.) Large-scale proofing or production trials may be accomplished in the 3-ton\/day Sunds CD-300 2-stage pilot plant.<\/p>\n\n\n\n Pulp produced in the pilot plant can be screened, cleaned, washed, and bleached on a continuous basis.<\/p>\n\n\n\n KRK Pressurized Laboratory Refiner<\/strong><\/p>\n\n\n\n Capacity: up to 15 pounds (6.8 kg) dry wood chips per batch; less for bulky non-woods<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n permits injection of chemicals just prior to refining 12-inch refiner with 60-HP motor running at 3600 rpm adjustable plate gap on-line energy measurement<\/p>\n\n\n\n This unit permits small batches of material to be processed very accurately and quickly, making it perfect for exploratory trials.<\/p>\n\n\n\n Sunds CD-300 Mechanical Pulping Pilot Plant<\/strong><\/p>\n\n\n\n Capacity: up to 3 tons\/day continuous feed on wood chips<\/p>\n\n\n\n Features:<\/p>\n\n\n\n primary refiner: 300-HP, 3600 rpm pressurized cyclone permits primary and secondary stages to be run at different pressures secondary refiner: 250-HP, 3600 rpm interstage reactor permits treatment of primary-stage pulp with aqueous or gaseous agents prior to secondary refining, 150 psig max. dedicated process computer with energy consumption monitoring<\/p>\n\n\n\n NC State has a flexible array of pilot equipment available for pulp processing and stock preparation. In one facility, pulp can be made down, bleached or otherwise chemically treated, washed or thickened, screened, centrifugally cleaned, and refined. Clients may ship in their own pulp in the form of market pulp, wetlap, drylap, or slurries. Pulps may also be generated on site chemically (using the rotary globe digester), mechanically (using the 3 ton\/day Sunds pilot plant), or via recycling. The final product may be formed into paper on the pilot fourdrinier, wet- or dry-lapped on the fourdrinier, or collected in drums or other containers from dewatering on the drum washer or screw press.<\/p>\n\n\n\n Black Clawson 200-gallon (760-liter) Hydrapulper<\/strong><\/p>\n\n\n\n This very flexible piece of equipment can be used both for stock-prep. pulping, mild chemical pulping, and low- or medium-consistency bleaching. The ability to inject steam and\/or chemicals is particularly attractive.<\/p>\n\n\n\n Capacity: 200 gallons (760-liters), can hold up to 45-90 OD lb (21-40 OD kg) of pulp at a consistency of 3-6 % (Vokes rotor) or up to 150 OD lb (68 OD kg) of pulp at medium consistency (helical rotor)<\/p>\n\n\n\n Construction: epoxy-lined carbon steel<\/p>\n\n\n\n Features:<\/p>\n\n\n\n 50-gallon (190-liter) Pilot Pulper<\/strong><\/p>\n\n\n\n Capacity: 50 gallons (190 liters), up to 17 OD pounds (7.7 OD kg) of pulp at 5 % consistency or 42 OD pounds 19 OD kg) at 12% consistency<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Bauer Hydrasieve Slanting Screen<\/strong><\/p>\n\n\n\n Designed to take low-consistency stock and thicken it passively to 3-6 percent.<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Face: 24\u2033<\/p>\n\n\n\n Screen: 0.010 slotted wave plate<\/p>\n\n\n\n Renneberg Pilot Screw Press<\/strong><\/p>\n\n\n\n Useful for intense dewatering of pulp slurries. Discharge consistencies of up to 40% are possible, depending on the furnish.<\/p>\n\n\n\n Construction: 316 SS<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Filtration Engineers Pilot Rotary Drum Filter Washer<\/strong><\/p>\n\n\n\n The equipment may be used either for dewatering or intense washing.<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Ahlstrom M200 Centrisorter Centrifugal Pressure Screen<\/strong><\/p>\n\n\n\n This unit has been modified to accept a 100 gpm (380-lpm) feed rate.<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Baskets available:<\/p>\n\n\n\n Gauld Periflow 140 Centrifugal Pressure Screen<\/strong><\/p>\n\n\n\n Features:<\/p>\n\n\n\n Baskets available:<\/p>\n\n\n\n Single bodies of the following centrifugal cleaners are available for flow-through production of cleaned pulp:<\/p>\n\n\n\n Sprout-Bauer Twin-Flo Stock Prep Refiner<\/strong><\/p>\n\n\n\n Designed for refining of stock at low consistency.<\/p>\n\n\n\n Features:<\/p>\n\n\n\n Viscosity – 0.5 % CED and intrinsic Brightness – ISO and GE Fiber length distribution – Bauer- McNett, Kajaani FS-200, Optest FQA<\/p>\n\n\n\n
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Small Pilot-Scale<\/h3>\n\n\n\n
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Large Pilot-Scale<\/h3>\n\n\n\n
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Mechanical Pulping<\/h2>\n\n\n\n
Small Pilot-Scale<\/h3>\n\n\n\n
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Large Pilot-Scale<\/h3>\n\n\n\n
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Pulp Processing<\/h2>\n\n\n\n
Pulping and Stock Makedown<\/h3>\n\n\n\n
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Washing and Thickening<\/h3>\n\n\n\n
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Centrifugal Screening<\/h3>\n\n\n\n
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Centrifugal Cleaning<\/h3>\n\n\n\n
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Refining<\/h2>\n\n\n\n
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Pulp Testing<\/h3>\n\n\n\n
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CONTACT US<\/h2>\n <\/div>\n