Pulp & Paper

High-Temperature Sealing Products for Pulp & Paper

Pulp and paper equipment operates through a combination of heat, steam, moisture, chemicals, and continuous production cycles. Paper dryers, recovery boilers, biomass boilers, process ductwork, and other thermal equipment rely on seals and flexible components to control heat, accommodate movement, and keep equipment accessible for maintenance.

Wood processing and kiln equipment present many of the same challenges. Drying systems operate through repeated heating and cooling cycles, while kiln doors, access panels, and duct connections need to maintain a seal despite temperature changes and equipment movement.

Gaskets, Inc. manufactures custom high-temperature sealing products for these applications. With more than 65 years of thermal sealing experience, we work with engineers and maintenance teams to select materials, profiles, and constructions based on how the equipment actually operates.

Industry Challenges

Thermal sealing problems in pulp, paper, and wood-processing equipment are rarely caused by temperature alone. Thermal expansion, compression, surface condition, vibration, moisture, and installation all affect how a seal performs over time.

Common challenges include:

  • High operating temperatures
  • Repeated thermal cycling
  • Steam and moisture exposure
  • Thermal expansion and contraction
  • Chemical exposure
  • Abrasive dust and particulate
  • Heat loss and air infiltration
  • Uneven or irregular sealing surfaces
  • Continuous production schedules
  • Frequent maintenance and equipment access

A seal that is too hard may not conform to an uneven surface. One that is over-compressed may have difficulty recovering as the equipment cycles. Material selection and seal geometry need to account for those conditions rather than temperature alone.

Sealing Solutions for Pulp, Paper & Wood Processing

Every facility has its own equipment designs, operating conditions, and maintenance requirements. Gaskets, Inc. manufactures sealing components around those requirements rather than treating every application as a standard part.

Products used in pulp, paper, and wood-processing applications include:

  • Tadpole Seals
  • Fabric Expansion Joints
  • Fiberglass Rope Gaskets
  • Ceramic Rope Gaskets
  • High-Temperature Tapes
  • Flexible Ducting
  • Extruded Silicone Seals
  • High-Temperature Materials
  • Insulation Materials
  • Custom-Fabricated Thermal Barriers

Tadpole seals are useful where a compressible thermal seal needs to conform to an uneven surface or accommodate a defined gap. Different core constructions, cover materials, bulb sizes, and tail dimensions allow the configuration to be matched to the equipment.

Expansion joints and flexible ducting address a different problem: movement. Where ductwork or connected equipment expands, contracts, vibrates, or shifts during operation, a flexible component can accommodate that movement without transferring the full load to a rigid connection.

Wood Processing & Kiln Applications

Wood drying and kiln equipment creates a combination of high temperatures, moisture, thermal cycling, and wood particulate. Sealing around kiln doors, access points, dampers, and duct connections is important for maintaining controlled operating conditions.

Heat loss around a kiln door can increase energy demand and make it more difficult to maintain consistent process temperatures. The seal also needs enough compression to accommodate variations in the mating surfaces without creating excessive resistance when the door is opened and closed.

Tadpole seals can be configured for kiln doors and other high-temperature access points using different bulb sizes, core materials, cover materials, and tail dimensions. The correct configuration depends on the available gap, compression, temperature, and mounting method.

These same considerations apply to lumber drying systems, biomass equipment, sawmill applications, and other wood-processing equipment where heat and particulate are present.

High-Temperature Seals for Dryers & Boilers

Paper dryers, recovery boilers, bark and biomass boilers, and other thermal equipment place significant demands on sealing components. Thermal cycling can cause equipment surfaces to move relative to one another, while continuous operation makes seal longevity and serviceability important.

Tadpole seals and rope gaskets can be used around access doors, inspection openings, and other high-temperature sealing points. Fabric expansion joints and flexible ducting can accommodate movement in process and exhaust ductwork.

The right construction depends on the application. Temperature, compression, movement, surface condition, chemical exposure, and installation space should all be considered when specifying a seal.

Common Applications

Gaskets, Inc. products are used in pulp, paper, and related wood-processing equipment, including:

  • Paper dryers
  • Recovery boilers
  • Bark and biomass boilers
  • Kilns
  • Lumber drying systems
  • Wood-processing equipment
  • Biomass processing systems
  • Process ductwork
  • Air handling systems
  • Heat exchangers
  • Steam systems
  • Industrial ovens
  • Expansion joints
  • Access doors
  • Inspection panels
  • Material handling equipment

Different equipment locations call for different sealing approaches. Tadpole seals provide a compressible thermal seal where surface conditions or gaps require conformability. Rope gaskets offer flexibility for high-temperature gasketing applications, while expansion joints and flexible ducting accommodate movement in duct and exhaust systems.

Managing Heat Loss & Thermal Movement

Heat loss around doors, access panels, and duct connections is often a sealing problem before it is an equipment problem. The amount of compression, the condition of the mating surfaces, and the seal's ability to recover after repeated cycling can all affect performance.

For kiln and dryer applications, maintaining an effective seal can help limit heat loss and unwanted air infiltration. In ductwork, the focus may be on accommodating movement while maintaining the connection through repeated thermal cycles.

Gaskets, Inc. can manufacture components from drawings, dimensions, samples, or existing specifications. When an existing seal is wearing prematurely or a standard profile doesn't fit the application, our team can work through the material and configuration with the customer.

Supporting Reliable Mill & Processing Operations

In a continuous production environment, replacing a seal is rarely just about replacing a piece of material. The new component needs to fit the equipment, provide the required compression, withstand the operating environment, and be practical to install and maintain.

That's where application experience matters.

Gaskets, Inc. has manufactured thermal sealing products in Wisconsin for more than 65 years. Our team works with OEM engineers, plant engineers, maintenance professionals, and industrial buyers to develop sealing components for real-world operating conditions.

Customers choose Gaskets, Inc. for:

  • More than 65 years of thermal sealing experience
  • Application-specific engineering
  • Custom manufacturing capabilities
  • Custom fabrication in Wisconsin
  • Experienced production teams
  • Responsive customer service
  • Reliable lead times
  • Long-term industrial partnerships

From recovery boilers and paper dryers to lumber kilns and wood-processing equipment, Gaskets, Inc. manufactures sealing products around the thermal, mechanical, and installation requirements of the application.