Pillows are mounted in the open cavity of a Flat Joint Frame Style to provide insulation value, to provide sound absorption, and to protect the open cavity from filing with particulate. FSP can provide internal pillows that are pinned to the frame, mounted using a flanged pillow design or floating. Pillows or bolsters are constructed of fiberglass or ceramic fiber blanket and are typically wrapped with stainless steel or Inconel mesh to hold the blanket in the cavity. Additional types of outer coverings are available including ceramic cloth and aluminized fabrics.
Insulation Pillows
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Accumulation Pillow
Accumlation pillows or insulation bolsters are manufactured out of fiberglass or ceramic high density blanket. They can be wrapped in stainless steel mesh or a variety high temperature fabrics. Multiple layers provide the thickness required to fill the expansion joint cavity of a Flat Belt Frame Style expansion joint. The primary purpose is to fill the expansion joint cavity, which reduces particulate build-up. This build-up of ash or particulate can reduce the flexibility of the expansion joint. The pillow can also be used to provide additional insulation or for sound abatement as well as to reduce flutter in high velocity applications.
