Fabric Expansion Joint

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Fabric Expansion Joint

Types of Fabric Expansion Joints

Parts of Fabric Expansion Joint System

Designs For A Variety Of Applications

Design of Frame Refer to Ducting

Design Concept based on surface Energy balanced

Fabric Expansion Joint Movement

Properties Of Elastomers and Fluoroplastic

Construction of Keyser Fabric Expansion Joint

Fabric Expansion Material Composition

Heat Sealer Equipment

Accessories

Heat Sealer Equipment

Keyser Manufactures high-performance PTFE materials for industrial application. These materials often require thermal welding (heat sealing) in field service. Cost effective and easy-to-use heatsealers are provided by Keyser for use with Keyser materials.

Equipment Description
The main function of a heat sealer is to introduce enough heat to allow a proper bond between PTFE surfaces of Keyser material. The melting point of PTFE is more than 300°C. However, the setting of a heat scaling iron is determined by factors like ambient temperature, thickness of bonding materials, and the surface upon which you heat seal.

Applying pressure can help facilitate a good bond, but in order to achieve a correct bond, the melting point of the Keyser materials must be reached.


PFA

A Perfluoroalkoxy, Teflon-PFA adhesive is recommended for best sealing performance with Keyser materials. Place the PFA between the two surface to be sealed. For difficult angles, it may be easier to tack or staple the PFA in place. PFA thickness of 0.127mm (0.005) or 0.255mm (0.010) are typically used.


PFA Property
PFA is a type of fluoropolymer with properties similar to polytetrafluoroethylene (PTFE)

Heat Sealer Process

Step 1

Prepare a surface that will not CONDUCT AWAY the heat. The thermo insulation material shown in the above picture is ideal for this purpose.

Step 2

A Keyser adhesive thin film is recommended for best sealing performance with Keyser materials. Place the adhesive layer between the two surface to be sealed. For difficult angles, it may be easier to tack or staple the Keyser adhesive layer in place. Keyser adhesive layer thickness of 0.127mm or 0.255mm is typically used.

Step 3

Bring the heat sealer in contact with the splice area. Make sure the heat sealer has reached the set point temperature around 380°C before using.

Step 4

Applying pressure will achieve a better bond in a shorter time period. Resirence time for a heat seal is a function of the material and the ambient conditions. Around five minutes will typically work for standard products in a normal plant setting. For wide splices or special geometry shapes, heat seal in sections, allowing a slight overlap from one section to the next to ensure a continuous bond.

Step 5

When the heat seal has been complted, remove the sealer. Allow the spice to cool to room temperature before handling.

Keyflex product

KEYFLEX Expansion Joints are designed and manufactured in accordance with the EJMA Standards and Requirements, which are recognized throughout the world. SINGLE Expansion Joint from size 50-200 above.

Engineering Division Product

Keyser has successfully widened its specialties into piping fabrication, pipe laying and machining field as the Welding & Machining Specialist with the Welding Procedure Specifications (WPS) acquired in accordance to the ASME Standards and DNV rules.