Inline Pressure Filters

In-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted, or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required.

Learn More
M-clean™ System

The M-clean system is a modular cleaning system for fabrics, belts, and rolls in process industries.

Learn More
Press Section Felt Cleaning Assembly

Among other applications, the press section felt cleaning assembly, also known as UHLE pipe, is designed to enhance uniform CD dewatering and cleaning, and minimize energy consumption on the press section of a paper machine.

Learn More
Doctor & Roll Cleaning Blades

Doctor and roll cleaning blades are used to clean rolls and remove stock accumulations, water, pitch, and filler buildup.

Learn More
Doctor & Roll Cleaning Blade Holders

Proper doctoring or roll cleaning is critical to many industrial processes and goes beyond choosing a doctor or roll cleaning blade.

Learn More
Roll Cleaner Assemblies

Roll cleaner assemblies are comprised of a roll cleaning blade, blade holder, structural beam, brackets and bearings along with an option to oscillate.

Learn More
Desuperheaters

Desuperheaters reduce the temperature of superheated steam to its saturation point for optimal heat transfer and efficiency.

Learn More
Direct Steam Injection Heaters

A direct steam injection heater provides a cost-effective method to heat water and other fluids by injecting steam directly into the fluid. The direct injection heater is designed to handle a wide range of flow rates and deliver hot fluids at precise temperatures.

Learn More
Flexible Metal Hose

Flexible hose prevents stress on rotary joints and unions as well as connected piping due to thermal expansion or vibration.

Learn More
Sight Flow Indicators

Kadant sight flow indicators are engineered to provide visual observation of liquid and gas flows. These pipeline indicators are available with ductile iron or bronze bodies. All glass windows are made of Pyrex® or equal.

Learn More
Thermocompressors

Kadant Johnson steam jet thermocompressors are designed to boost low pressure steam by accurately mixing the low pressure steam with high pressure steam.

Learn More
Corrugator Steam Systems

Developing an integrated corrugated steam system is key to efficiently meeting the production speeds and improving operational runnability of modern corrugators.

Learn More
Pulping & Detrashing

Complete systems for all pulping and detrashing applications based on your requirements for quality, energy efficiency, and maximum fiber recovery.

Learn More
Heat Transfer

A complete line of energy-efficient heat transfer products for the chemical pulp mill including blow-heat systems, multiple-effect evaporator & concentrator trains, indirect liquor heaters, condensate segregation, stripping, and methanol recovery.

Learn More
Recausticizing

Economic recausticizing solutions for the kraft and soda processes, including innovative upgrades to clarification, filtration, and grit management solutions - all designed to maximize efficiency, reduce energy consumption and meet environmental regulations.

Learn More
Pulp Washing

The world’s only all-in-one, multi-stage displacement pulp washer, The Kadant Chemi-Washer® is a proven performer for brown stock and bleach plant applications the world over.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Fiber-based Granules

Kadant GranTek Inc. transforms papermaking waste products into several viable cellulose granular products used as carriers for pest control in crop protection, green space maintenance, as an all purpose industrial absorbent and as premium cat box fillers.

Learn More
Doctor & Roll Cleaning Blades

Doctor and roll cleaning blades are used to clean rolls and remove stock accumulations, water, pitch, and filler buildup.

Learn More
Doctor & Roll Cleaning Blade Holders

Proper doctoring or roll cleaning is critical to many industrial processes and goes beyond choosing a doctor or roll cleaning blade.

Learn More
Roll Cleaner Assemblies

Roll cleaner assemblies are comprised of a roll cleaning blade, blade holder, structural beam, brackets and bearings along with an option to oscillate.

Learn More
Double Doctoring Systems

A double doctor system provides the extra performance of two independently adjustable doctor blades within one unit.

Learn More
M-clean™ System

The M-clean system is a modular cleaning system for fabrics, belts, and rolls in process industries.

Learn More
Press Section Felt Cleaning Assembly

Among other applications, the press section felt cleaning assembly, also known as UHLE pipe, is designed to enhance uniform CD dewatering and cleaning, and minimize energy consumption on the press section of a paper machine.

Learn More
Spray Nozzles

Spray nozzles are used to remove contaminants and are essential in the cleaning process of many manufacturing processes.

Learn More
Stationary and Oscillating Showers

Shower systems are used to clean contaminates off machine fabric. Stationary and oscillating shower systems are available for a variety of applications.

Learn More
Mist Elimination Systems

The Mist Eliminator incorporates standard paper machine components to thoroughly clean forming fabrics and eliminate mist that is often associated with high-pressure showering.

Learn More
Electro-Mechanical Shower Oscillators

Electro-mechanical shower oscillators are precisely synchronized with the machine speed and fabric loop to ensure that 100% of the fabric is cleaned.

Learn More
Inline Pressure Filters

In-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted, or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required.

Learn More
Water Resource Recovery Strainers

A proper water resource recovery system is used to effectively and efficiently reclaim white water, heat, chemicals, and fiber from a variety of paper and pulp mill applications, including DAF filtrate, save-all water, and seal pit water.

Learn More
High-Resolution™ Forming System

The High-Resolution forming system is designed for use with packaging grades of paper. This three-component system consisting of high-resolution drainage structures, Stepfoil™ technology, and high precision vacuum control provides the papermaker with excellent activity control across broad grade structures and different furnishes while maintaining an open sheet.

Learn More
Rotary Joints & Rotary Unions

A rotary joint, also referred to as a rotary union or rotating union, permits the flow of various media from a stationary supply pipe and into and/or out of rotating equipment. Heat transfer and hydraulic media typically used with rotary joints and rotating unions include steam, water, thermal oil, hydraulic oil, air, and coolant.

Learn More
Custom Rotary Unions & Swivels

Kadant Johnson’s product innovation team focuses on making the best solution in the shortest time possible. We provide rapid design and manufacturing services to ensure our new project solutions process for custom rotary unions and swivel joints put our customers at the center of our schedule.

Learn More
Multi-Passage Rotary Unions

Multi-passage (MP) rotary unions are used when more than one media are used simultaneously. An MP rotary union provides multiple seals between stationary connections and rotating equipment, such as a drum, index table, clutch, or spindle.

Learn More
Rubber Expansion Joints

Hand-crafted rubber expansion joints available in single- and multiple-arch designs are custom-built to fit your application requirements. Options include PTFE-lined, concentric reducing, eccentric reducing, filled arch, lightweight, and off-set configurations.

Learn More
Metal Bellows Expansion Joints

Custom-engineered single- and dual-bellows designs made from 18-8 stainless steel alloy 321 with high intergranular corrosion resistance. Options include PTFE-lined, universally-tied, pressure-balanced, Gimbal, and hinged, among other configurations.

Learn More
PTFE Expansion Joints

Solid-molded PTFE expansion joints are corrosion-resistant and made to withstand the high pressure and temperature in a compact, space-saving design. Available in standard sizes 1” to 12” with two, three, or five convolutions.

Learn More
Fabric Expansion Joints

Non-metallic, flue-duct expansion joints available in eight standard profiles to fit your application requirements up to 2,000 F. Custom-designed with single-layer and composite belts and elastomers with excellent abrasion resistance.

Learn More
Flexible Metal Hose & Connectors

Corrugated metal hose with and without external braiding and metal pump connectors to absorb vibration, misalignment, and piping thermal expansion or contraction. Options include rubber covering, unique alloys, and sizes from 0.25” to 12”.

Learn More
Industrial Hose

Custom-engineered and hand-built flexible hose for a variety of industrial applications including high-pressure FDA compliant sanitary hose, chemical hose, air hose, petroleum hose, and material handling hose. Lengths available up to 500 feet and diameters up to 28”.

Learn More
Desuperheaters

Desuperheaters reduce the temperature of superheated steam to its saturation point for optimal heat transfer and efficiency.

Learn More
Direct Steam Injection Heaters

A direct steam injection heater provides a cost-effective method to heat water and other fluids by injecting steam directly into the fluid. The direct injection heater is designed to handle a wide range of flow rates and deliver hot fluids at precise temperatures.

Learn More
Thermocompressors

Kadant Johnson steam jet thermocompressors are designed to boost low pressure steam by accurately mixing the low pressure steam with high pressure steam.

Learn More
Condensate Pumps

With no maintenance-intensive components to leak, wear, or fail, the Liqui-Mover condensate pump is a naturally more reliable than conventional pumps. As a result, the Liqui-Mover condensate pump will work longer, with less maintenance and far less downtime than conventional pumps.

Learn More
Replacement Level Control

Replacement level controls are reliable and cost-effective control assemblies for servicing pressure powered pumps and pumping traps.   

Learn More
Corrugator Steam Systems

Developing an integrated corrugated steam system is key to efficiently meeting the production speeds and improving operational runnability of modern corrugators.

Learn More
Steam Systems

Kadant Johnson combines over 80 years of process expertise and an extensive product portfolio to deliver cost-effective, application-specific solutions.

Learn More
Flexible Metal Hose

Flexible hose prevents stress on rotary joints and unions as well as connected piping due to thermal expansion or vibration.

Learn More
Sight Flow Indicators

Kadant sight flow indicators are engineered to provide visual observation of liquid and gas flows. These pipeline indicators are available with ductile iron or bronze bodies. All glass windows are made of Pyrex® or equal.

Learn More
Vacuum Breakers

Kadant Johnson vacuum breakers provide a simple, dependable way to relieve unwanted vacuum which may develop in a closed vessel or pipeline. They can be used to prevent contamination from back siphonage in fluid handling systems, and to protect equipment against collapse or implosion.

Learn More
Air & Steam Separators

To improve the operating efficiency of pneumatic equipment, Kadant Johnson air separators eliminate 99% of entrained contaminants including moisture, pipe scale, dirt and oil.

Learn More
Pulping & Detrashing

Complete systems for all pulping and detrashing applications based on your requirements for quality, energy efficiency, and maximum fiber recovery.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More
Deinking

Based on our advanced flotation technology, the MAK-C Deinking Cell offers maximum yield and efficiency.

Learn More
High Shear Devices

Top-performing refiners and dispersers built tough and used across the globe.

Learn More
Heat Transfer

A complete line of energy-efficient heat transfer products for the chemical pulp mill including blow-heat systems, multiple-effect evaporator & concentrator trains, indirect liquor heaters, condensate segregation, stripping, and methanol recovery.

Learn More
Recausticizing

Economic recausticizing solutions for the kraft and soda processes, including innovative upgrades to clarification, filtration, and grit management solutions - all designed to maximize efficiency, reduce energy consumption and meet environmental regulations.

Learn More
Pulp Washing

The world’s only all-in-one, multi-stage displacement pulp washer, The Kadant Chemi-Washer® is a proven performer for brown stock and bleach plant applications the world over.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More
Inline Pressure Filters

In-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted, or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required.

Learn More
M-clean™ System

The M-clean system is a modular cleaning system for fabrics, belts, and rolls in process industries.

Learn More
Press Section Felt Cleaning Assembly

Among other applications, the press section felt cleaning assembly, also known as UHLE pipe, is designed to enhance uniform CD dewatering and cleaning, and minimize energy consumption on the press section of a paper machine.

Learn More
Doctor & Roll Cleaning Blades

Doctor and roll cleaning blades are used to clean rolls and remove stock accumulations, water, pitch, and filler buildup.

Learn More
Doctor & Roll Cleaning Blade Holders

Proper doctoring or roll cleaning is critical to many industrial processes and goes beyond choosing a doctor or roll cleaning blade.

Learn More
Roll Cleaner Assemblies

Roll cleaner assemblies are comprised of a roll cleaning blade, blade holder, structural beam, brackets and bearings along with an option to oscillate.

Learn More
Desuperheaters

Desuperheaters reduce the temperature of superheated steam to its saturation point for optimal heat transfer and efficiency.

Learn More
Direct Steam Injection Heaters

A direct steam injection heater provides a cost-effective method to heat water and other fluids by injecting steam directly into the fluid. The direct injection heater is designed to handle a wide range of flow rates and deliver hot fluids at precise temperatures.

Learn More
Flexible Metal Hose

Flexible hose prevents stress on rotary joints and unions as well as connected piping due to thermal expansion or vibration.

Learn More
Sight Flow Indicators

Kadant sight flow indicators are engineered to provide visual observation of liquid and gas flows. These pipeline indicators are available with ductile iron or bronze bodies. All glass windows are made of Pyrex® or equal.

Learn More
Thermocompressors

Kadant Johnson steam jet thermocompressors are designed to boost low pressure steam by accurately mixing the low pressure steam with high pressure steam.

Learn More
Corrugator Steam Systems

Developing an integrated corrugated steam system is key to efficiently meeting the production speeds and improving operational runnability of modern corrugators.

Learn More
Pulping & Detrashing

Complete systems for all pulping and detrashing applications based on your requirements for quality, energy efficiency, and maximum fiber recovery.

Learn More
Heat Transfer

A complete line of energy-efficient heat transfer products for the chemical pulp mill including blow-heat systems, multiple-effect evaporator & concentrator trains, indirect liquor heaters, condensate segregation, stripping, and methanol recovery.

Learn More
Recausticizing

Economic recausticizing solutions for the kraft and soda processes, including innovative upgrades to clarification, filtration, and grit management solutions - all designed to maximize efficiency, reduce energy consumption and meet environmental regulations.

Learn More
Pulp Washing

The world’s only all-in-one, multi-stage displacement pulp washer, The Kadant Chemi-Washer® is a proven performer for brown stock and bleach plant applications the world over.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Fiber-based Granules

Kadant GranTek Inc. transforms papermaking waste products into several viable cellulose granular products used as carriers for pest control in crop protection, green space maintenance, as an all purpose industrial absorbent and as premium cat box fillers.

Learn More
Doctor & Roll Cleaning Blades

Doctor and roll cleaning blades are used to clean rolls and remove stock accumulations, water, pitch, and filler buildup.

Learn More
Doctor & Roll Cleaning Blade Holders

Proper doctoring or roll cleaning is critical to many industrial processes and goes beyond choosing a doctor or roll cleaning blade.

Learn More
Roll Cleaner Assemblies

Roll cleaner assemblies are comprised of a roll cleaning blade, blade holder, structural beam, brackets and bearings along with an option to oscillate.

Learn More
Double Doctoring Systems

A double doctor system provides the extra performance of two independently adjustable doctor blades within one unit.

Learn More
M-clean™ System

The M-clean system is a modular cleaning system for fabrics, belts, and rolls in process industries.

Learn More
Press Section Felt Cleaning Assembly

Among other applications, the press section felt cleaning assembly, also known as UHLE pipe, is designed to enhance uniform CD dewatering and cleaning, and minimize energy consumption on the press section of a paper machine.

Learn More
Spray Nozzles

Spray nozzles are used to remove contaminants and are essential in the cleaning process of many manufacturing processes.

Learn More
Stationary and Oscillating Showers

Shower systems are used to clean contaminates off machine fabric. Stationary and oscillating shower systems are available for a variety of applications.

Learn More
Mist Elimination Systems

The Mist Eliminator incorporates standard paper machine components to thoroughly clean forming fabrics and eliminate mist that is often associated with high-pressure showering.

Learn More
Electro-Mechanical Shower Oscillators

Electro-mechanical shower oscillators are precisely synchronized with the machine speed and fabric loop to ensure that 100% of the fabric is cleaned.

Learn More
Inline Pressure Filters

In-line filters can have a single or duplex arrangement. A single in-line filter is used in applications where the flow can be interrupted, or the filter can be bypassed when the filter element is serviced. Duo filters are used when continuous filtration is required.

Learn More
Water Resource Recovery Strainers

A proper water resource recovery system is used to effectively and efficiently reclaim white water, heat, chemicals, and fiber from a variety of paper and pulp mill applications, including DAF filtrate, save-all water, and seal pit water.

Learn More
High-Resolution™ Forming System

The High-Resolution forming system is designed for use with packaging grades of paper. This three-component system consisting of high-resolution drainage structures, Stepfoil™ technology, and high precision vacuum control provides the papermaker with excellent activity control across broad grade structures and different furnishes while maintaining an open sheet.

Learn More
Rotary Joints & Rotary Unions

A rotary joint, also referred to as a rotary union or rotating union, permits the flow of various media from a stationary supply pipe and into and/or out of rotating equipment. Heat transfer and hydraulic media typically used with rotary joints and rotating unions include steam, water, thermal oil, hydraulic oil, air, and coolant.

Learn More
Custom Rotary Unions & Swivels

Kadant Johnson’s product innovation team focuses on making the best solution in the shortest time possible. We provide rapid design and manufacturing services to ensure our new project solutions process for custom rotary unions and swivel joints put our customers at the center of our schedule.

Learn More
Multi-Passage Rotary Unions

Multi-passage (MP) rotary unions are used when more than one media are used simultaneously. An MP rotary union provides multiple seals between stationary connections and rotating equipment, such as a drum, index table, clutch, or spindle.

Learn More
Rubber Expansion Joints

Hand-crafted rubber expansion joints available in single- and multiple-arch designs are custom-built to fit your application requirements. Options include PTFE-lined, concentric reducing, eccentric reducing, filled arch, lightweight, and off-set configurations.

Learn More
Metal Bellows Expansion Joints

Custom-engineered single- and dual-bellows designs made from 18-8 stainless steel alloy 321 with high intergranular corrosion resistance. Options include PTFE-lined, universally-tied, pressure-balanced, Gimbal, and hinged, among other configurations.

Learn More
PTFE Expansion Joints

Solid-molded PTFE expansion joints are corrosion-resistant and made to withstand the high pressure and temperature in a compact, space-saving design. Available in standard sizes 1” to 12” with two, three, or five convolutions.

Learn More
Fabric Expansion Joints

Non-metallic, flue-duct expansion joints available in eight standard profiles to fit your application requirements up to 2,000 F. Custom-designed with single-layer and composite belts and elastomers with excellent abrasion resistance.

Learn More
Flexible Metal Hose & Connectors

Corrugated metal hose with and without external braiding and metal pump connectors to absorb vibration, misalignment, and piping thermal expansion or contraction. Options include rubber covering, unique alloys, and sizes from 0.25” to 12”.

Learn More
Industrial Hose

Custom-engineered and hand-built flexible hose for a variety of industrial applications including high-pressure FDA compliant sanitary hose, chemical hose, air hose, petroleum hose, and material handling hose. Lengths available up to 500 feet and diameters up to 28”.

Learn More
Desuperheaters

Desuperheaters reduce the temperature of superheated steam to its saturation point for optimal heat transfer and efficiency.

Learn More
Direct Steam Injection Heaters

A direct steam injection heater provides a cost-effective method to heat water and other fluids by injecting steam directly into the fluid. The direct injection heater is designed to handle a wide range of flow rates and deliver hot fluids at precise temperatures.

Learn More
Thermocompressors

Kadant Johnson steam jet thermocompressors are designed to boost low pressure steam by accurately mixing the low pressure steam with high pressure steam.

Learn More
Condensate Pumps

With no maintenance-intensive components to leak, wear, or fail, the Liqui-Mover condensate pump is a naturally more reliable than conventional pumps. As a result, the Liqui-Mover condensate pump will work longer, with less maintenance and far less downtime than conventional pumps.

Learn More
Replacement Level Control

Replacement level controls are reliable and cost-effective control assemblies for servicing pressure powered pumps and pumping traps.   

Learn More
Corrugator Steam Systems

Developing an integrated corrugated steam system is key to efficiently meeting the production speeds and improving operational runnability of modern corrugators.

Learn More
Steam Systems

Kadant Johnson combines over 80 years of process expertise and an extensive product portfolio to deliver cost-effective, application-specific solutions.

Learn More
Flexible Metal Hose

Flexible hose prevents stress on rotary joints and unions as well as connected piping due to thermal expansion or vibration.

Learn More
Sight Flow Indicators

Kadant sight flow indicators are engineered to provide visual observation of liquid and gas flows. These pipeline indicators are available with ductile iron or bronze bodies. All glass windows are made of Pyrex® or equal.

Learn More
Vacuum Breakers

Kadant Johnson vacuum breakers provide a simple, dependable way to relieve unwanted vacuum which may develop in a closed vessel or pipeline. They can be used to prevent contamination from back siphonage in fluid handling systems, and to protect equipment against collapse or implosion.

Learn More
Air & Steam Separators

To improve the operating efficiency of pneumatic equipment, Kadant Johnson air separators eliminate 99% of entrained contaminants including moisture, pipe scale, dirt and oil.

Learn More
Pulping & Detrashing

Complete systems for all pulping and detrashing applications based on your requirements for quality, energy efficiency, and maximum fiber recovery.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More
Deinking

Based on our advanced flotation technology, the MAK-C Deinking Cell offers maximum yield and efficiency.

Learn More
High Shear Devices

Top-performing refiners and dispersers built tough and used across the globe.

Learn More
Heat Transfer

A complete line of energy-efficient heat transfer products for the chemical pulp mill including blow-heat systems, multiple-effect evaporator & concentrator trains, indirect liquor heaters, condensate segregation, stripping, and methanol recovery.

Learn More
Recausticizing

Economic recausticizing solutions for the kraft and soda processes, including innovative upgrades to clarification, filtration, and grit management solutions - all designed to maximize efficiency, reduce energy consumption and meet environmental regulations.

Learn More
Pulp Washing

The world’s only all-in-one, multi-stage displacement pulp washer, The Kadant Chemi-Washer® is a proven performer for brown stock and bleach plant applications the world over.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More
Screening

A full range of innovative options for screening stock pulp. Cost-effective solutions for a variety of applications including wastepaper recycling, deinking, virgin fiber and approach flow processing.

Learn More
Cleaning

Comprehensive cleaning solutions for high efficiency removal of all types of contaminants from pulp slurries.

Learn More
Thickening

Recovery systems for white water, heat, chemicals, and fiber for a variety of paper and pulp mill applications.

Learn More

Rotary Joint Requirements for Paper Production

By David Moss March 10, 2020

The papermaking process is essentially one of removing water. This process begins in the forming section where free water is drained from the pulp slurry using gravity and suction (vacuum) boxes. The forming section is followed by the press section where mechanical pressing forces are used to squeeze water out of the sheet. The press section is followed by the dryer section where water is evaporated using steam to heat the surface of multiple dryer cylinders. Paper drying requires a large amount of energy and expensive equipment, so it is desirable to minimize the amount of water in the sheet entering the dryer section. This is where rotary joints play a critical role in the papermaking process. Every steam heated drying cylinder is equipped with at least one rotary joint and syphon. The rotary joint connects the piping to the rotating cylinder and allows steam into the cylinder and condensate out via a syphon inside the cylinder. The cylinder’s capacity to transfer heat depends mainly on the design and operation of the syphon and dryer bars.

Rotary joints operate with different steam pressures. Pressures vary to suit the respective grades of paper being produced, from heavy board grades to lightweight tissue, graphics, newsprint, and packaging grades. Through extensive research and development testing, all Kadant Johnson rotary joints used in the papermaking industry provide reliable and extended service for all paper grades.

Rotary joints can be found on other sections of a paper machine as well. One area is on water-cooled rolls for press and size press positions. In this application, heat is generated by nip pressure and starch temperature influences the soft rubber cover which needs cooling. The cover gets cooled by introducing water to the center of the roll to cool the metal shell and therefore the rubber cover.

Where soft nip calenders are used to give a specific finish to the paper being produced, rotary joints provide the transfer of hot water or hot oil to the calender rolls to heat and maintain an even surface temperature which gives a gloss, matte, or smooth finish to the paper web.

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