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The details concerning the installation of a new chemi-thermomechanical pulp (CTMP), at Rottneros Group's facility in Utansjo, Sweden, for increasing production, are presented.

On February 18, 2003 (68 FR 7706-7718), EPA issued a direct final rule revising the maximum achievable control technology (MACT) standards for chemical recovery combustion sources at pulp mills. The [...]

Wood quality assessment is an important issue in the pulp and paper industry. In this paper an automatic visual inspection system for wood structural quality measurement is described. To improve statistical image segmentation a new logarithm based global contrast enhancement technique is described. Region identification and reconstruction is performed based on local morphological operators with constrained merge operations. A measurement technique, build-up upon a constrained optimisation problem, is described for fibber wall width computation. The method proves computational efficiency. The described inspection system uses only two control parameters. Keywords: Quality Control; Production Systems; Automatic Visual Inspection; Vision and Image Processing; Contrast Enhancement; Microscope Image Analyses; Pulp and Paper

An automatic visual inspection system designed for dirt inspection in the pulp and paper industry is presented. A new hierarchical region oriented segmentation algorithm is introduced. The algorithm is tuned according to the singular characteristics of the pulp samples. A criterion based on the maximisation of the local contrast is defined in order to perform a defect region segmentation of the pulp and paper images. Some optimisations are introduced to avoid an excessive computational load. Keywords: Quality Control; Automatic Visual Inspection; Production; Pulp and Paper; Computer Vision; Pattern Recognition.

Maintenance and reliability operations in the pulp and paper industry have improved dramatically in the past decade and yet there still is more work to be done. Maintenance operations have [...]

Black Clawson uses its expertise and resources as it goes the 'extra mile' in supplying P.H. Glatfelter with a turnkey coating line. In today's continually expanding global economy, flexibility and [...]

Filler and coating materials in the pulp and paper industry have seen some dramatic changes over the past 20 years as usage patterns have changed Although quite a significant number [...]

The reliability of power and recovery boilers can be critical to a pulp or paper mill's profitability. The causes of boiler failure, which include fuel explosion, poor water treatment, and improper warm-up, are discussed. Preventive measures that can reduce the chance of boiler damage are listed. Operators should observe the burner flame frequently and purge the furnace before igniting a burner., In the age of advanced controls, understanding the fundamentals of power and recovery boiler operation is necessary to prevent disaster After paper machines and pulp dryers, power and recovery boilers [...]

Tsai Lun was inspired to make paper when watching wasps build their nests in China nearly 2,000 years ago. The paper industry has its roots in nature, but is it [...]

Peracids are again being considered by pulp mills as a possible complement to hydrogen peroxide and other nonchlorine bleaching agents and as a possible complement or alternative to ozone. The peracids group consists of organic and inorganic acids that exhibit a O-O bond. Information on commercial peracids production, practical considerations for the use of peracids, and the outlook for peracids use is presented., Mill trials explore peracids as a potential complement and alternative to non-chlorine bleaching agents for kraft pulp THE DESIRE, TO DEVELOP LOW-COST TECHNOLOGIES for low-AOX and TCF bleaching has renewed [...]

Manufacturers of pulp and paper mill chemicals are listed in alphabetical order by the type of chemicals produced. The specific forms or special compounds of each group of chemicals is also indicated next to each company.

An alphabetical listing of papermaking machinery is presented ranging from absorption towels and accumulators to wrapping machines. The listing serves as a guide to the major types of equipment used in the pulp and paper industry. The guide also includes a comprehensive listing of manufacturers., ABSORPTION TOWERS Advanced Industrial Technology Corp. Airpol Inc. Alby Technologies Ltd. Ambi Inc. Beltran Associates Inc. Ceilcote Air Pollution Control Chemflow Corning Inc., Corning Process Systems Ducon Environmental Systems Inc [...]

The SPCI 1993 exhibition, held in conjunction with the 85th SPCI annual meeting in Stockholm last June, was the major event of the year for the Nordic pulp and paper [...]

Second-generation duplex steels are supposedly more corrosion resistant and cheaper than conventional austenistic AISI types of steel. Alloy 2205 is a second-generation steel, claimed to be cost-competitive with Types 316, 316L, 317 and 317L. Alloy 2205 is applicable to pumps and several plant components in the pulp and paper sector. The benefits of the alloy include increased part life, reduced downtime, less maintenance and less part inventories, leading to lesser overall expenditures., Strength, toughness, resistance to corrosion, pitting, and oxidation lower overall costs of maintaining pump life Last month's article introduced new, commercially available second-generation duplex steels that claim significantly better corrosion [...]

Reports show that pulp and paper mills are under increasing pressure to meet shareholder expectations of increased profitability through improved plant efficiency. It is believed that continuous online monitoring can predict and protect the health of these mills' critical machinery. The importance of monitoring the health of rotating machines is also discussed.

The evolution of equipment design for pulp washing has been very evident for the last 20 years. Today's mills are fortunate to have different washing systems to choose from. These innovative generation systems offer several advantages such as better washing efficiencies, lower operating and capital costs. Some of the reliable alternatives to rotary-vacuum drum washer are Ahlstrom Drum Displacer, Black Clawson Chemi-Washer, IMPCO Compaction Baffle Filter, Kamyr Pressure Diffuser and Sunds Displacement Press., Mills seeking to upgrade or install new systems can find numerous alternatives to conventional rotary-vacuum drum washer approach In the last 10 to 20 years, there have probably been more [...]

A buyers guide to chemicals used by the pulp and paper industry and the companies that prepares and manufactures them is presented. The chemicals presented include acids, compounds and detergents.

Various chemicals that are becoming available for pulp-bleaching sequences are discussed. The chemicals evaluated include activated oxygen, bromine, Caro's acid, chemical bleaching catalysts, chlorine monoxide, flourine and its compounds, nitrogen oxides, nitrosating agents, ozone, peroxyacetic and peroxyformic acids, potassium permanganate, single oxygen, sodium borohydride, sodium chlorate, sodium chlorite, sodium hydrosulfite, supercritical fluids, trichloroisocyanuric acid, uranium trichloride, white-rot fungi and xylanase., Which chemicals currently being tested in laboratories and pilot plants will further transform the bleach plant? As few as 10 years ago, bleaching sequences for chemical pulp were fairly predictable, [...]

First commercial installation, at Mead Corp.'s Chillicothe, Ohio, mill, results in overthick chip removal efficiency of 98% Uniform chips produce better-quality pulp. To this end, chip thickness screening and slicing [...]

British Suppliers of equipment to the pulp and paper industries continue to enjoy a place among the leaders in their field. Members of the British Paper Machinery Maker's Association (BPMMA) [...]

Unit helps analyze and implement an effective program to maximize condensate system protection and minimize costs Basic requirements in current operation of boiler systems include maximizing energy efficiency and reliability [...]

PULP MILL AND BLEACH PLANT CHEMICAL PULPING. The pulping process depends on pumps to convey cooling liquors to the cooking vessel, and it consists of several different chemical methods. However, [...]

High-performance greases A 20-page brochure is available on Exxon's extensive line of premium-quality performance greases for pulp and paper applications. Presenting performance data and detailed charts, the brochure highlights the [...]

In the past, mystery often surrounded the selection of control valves in pulp and paper mills. Vendors promoting their wares have made conflicting recommendations on applications ranging from pulp stock [...]

Zellstoff Rosenthal's kraft pulp mill in Blankenstein, Germany has undergone a process control upgrade with the Metso Automation optimization controls. The optimization control was installed to stabilize and lower energy costs in the lime kiln process. Other details about the lime kiln optimization program are discussed.

The article discusses the Czech Republic's Frantschach Steti mill and how it will be revamping its equipment over the next few years. The first part of the investment on PM 5's drying section has recently been completed.

Measurex Corp and Honeywell Inc are nearing completion of their $600 million merger. Honeywell's acquisition of Measurex will boost its presence in the pulp and paper mill integrated system market. Honeywell manufactures control systems for pulp mills and Measurex produces paper machine actuators, sensor-based paper quality control systems and also provides paper quality control services. The newly-formed company to be known as Honeywell-Measurex will be located in Cupertino, CA., Honeywell Inc. and measurex corp. have reached an agreement, announced on January 27, to merge the two companies in an all-ash transaction valued at about $600 million, or about $35 [...]

Paper mills plan to improve capacity and efficiency of old chemical recovery boilers instead of purchasing new units which are too expensive. Old chemical recovery boiler upgrades include conversions to low odor operations, economizer replacements, upgrades of two-level to three-level air delivery systems and modification of cleaning and sootblowing systems. Some mills might consider converting oil boilers to power boilers., Several years ago, the black liquor Recovery Boiler Advisory Committee (BLR-BAC) published data showing that the mean age of recovery boilers in the U.S. was more than 20 years. 'At [...]

No, the pulp and paper industry has been responding to environmental and competitive challenges by investing in new technology Talking to engineers in pulp and paper, you quickly find a […]

Self-lubricating sealing compound, a packing and sealing product manufactured by Tom-Pac Inc., is conserving water and decreasing maintenance costs for pulp and paper manufacturers. The sealing compound provides zero leakage, does not damage the shaft sleeve and requires no cooling or flush water. The self-lubricating sealing compound is more economical than traditional sealing methods and does not require additional parts., THE UNCERTAINTY OF TRYING anything new in the pulp an paper industry leaves many mills somewhat reluctant pioneer new technologies, even when the new technology doesn't involve major capital equipment. [...]

A batch high-consistency pulping system is designed to produce a cleaner, product for high quality papers. This costlier system requires more power and a larger pulper feed conveyer to minimize cycle time. BE&K Engineering claims that 95% of contaminants are removed, compared to only about 65% from a conventional system. Details of the batch system's operation are included., Batch high-consistency pulping is more expensive and requires more power than conventional low-consistency pulping systems. The question then must be asked, 'Why should batch pulping even be considered for old [...]