Preformed sound absorbing material for engine exhaust muffler
OwnerGoran Knutssoninventor
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Abstract
This invention provides preforms of continuous glass fiber strands for use as the sound absorbing material in an engine exhaust muffler. Preferably, the material is made of glass fibers of E glass compositions. With this invention, the strands are fluffed up, not directly in the muffler, but in a cavity that is made of a perforated shell matching the muffler shape. During this operation, a powder binder also is blown in with the fibers. This blowing operation is completed by forcing hot air through the preform which melts or cures the binder and allows it to bond the fibers together.
Claims15
A process for forming a preform of continuous, glass fiber strands comprising the steps of:
- inserting continuous, glass fiber strands into a perforated shell having the shape of a desired preform;
- feeding the continuous strands through an apparatus that blows or expands the strands into a wool like material;
- inserting a powder binder into the perforated shell together with the strands;
- circulating hot air into the perforated shell to soften or cure the binder;
- wherein the softened or cured binder bonds the wool-like strands together;
- and
- cooling the bonded, wool-like strands to form and set the preform.
A preform of continuous, glass fiber strands for use as sound absorbing material in an engine exhaust muffler wherein the strands are fluffed up into a wool-type material and bonded together with a thermoplastic or thermosetting powdered binder.
Dependencies are inferred from the claim text.