Method of filling a casing with heat insulating fibers

Abstract

Method of filling a casing with heat insulating fibers in which a fibrous heat insulating mass of fixed size is inserted into a space to be filled by vacuum-packing the fibrous mass in a vacuum-resistant bag, which may then be wrapped about an inner cylinder, introducing the bag into an outer cylinder and, after breaking the vacuum seal, allowing the fibrous mass to swell and fill any space within the outer cylinder not occupied by said inner cylinder, if any.

What is claimed is: .[.1. Method of manufacturing a heat insulator which comprises the steps of introducing between an outer casing and an inner casing an insert comprising a mass of fibrous material which has been compressed by vacuum-packing it in a hermetically sealed bag, and then unsealing said bag to permit said material to expand within said 
     
        casing..]. 2. Method .[.as claimed in claim 1.]. .Iadd.of manufacturing a heat insulator .Iaddend.which comprises the .[.step.]. .Iadd.steps .Iaddend.of .[.first.]. wrapping .[.said.]. .Iadd.a hermetically .Iaddend.sealed bag .[.containing said mass of fibrous material.]. about an inner casing to form .[.the.]. .Iadd.an .Iaddend.insert .[.introduced into said outer casing.]., .Iadd.said sealed bag containing a mass of fibrous material which has been compressed by vacuum-packing said fibrous material in the sealed bag; and then introducing said insert into an outer casing; and then unsealing said bag to permit said fibrous material to expand between the inner casing and the outer casing; wherein the fibrous material is caused to fill the space between inner and outer cylindrical casing encircling a passage for the gas exhausted from an automotive engine.Iaddend.. .[.3. Method as claimed in claim 1 which said bag is sealed in such a way that it may be unsealed by the application of an amount of heat insufficient to damage said fibrous mass and casing, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing..]. .[.4. Method as claimed in claim 1 in which said bag is made of a material which is destroyed by the application thereto of an amount of heat insufficient to damage said casing and fibrous mass, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing..]. .[.5. Method as claimed in claim 1 in which said fibrous material is selected from the group consisting of rock wool, silica fiber, ceramic fiber, and mixtures thereof..]. 6. Method as claimed in claim 1 in which said bag is made from a plastic selected from the group consisting of nylon, polyethylene, polypropylene, and combinations thereof..]. .[.7. Method as claimed in claim 1 in which the fibrous mass is caused to fill the space between inner and outer cylindrical casing encircling a passage for the gas exhausted from an automotive engine..]. 
     
     
        .Iadd.8.  Method as claimed in claim 2 in which said bag is sealed in such a way that it may be unsealed by the application of an amount of heat insufficient to damage said fibrous mass and casing, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing. .Iaddend. .Iadd.9. Method as claimed in claim 2 in which said bag is made of a material which is destroyed by the application thereto of an amount of heat insufficient to damage said casing and fibrous mass, and comprising the step of applying said amount of heat to said insulator after said bag has been introduced into said casing. .Iaddend. .Iadd.10. Method as claimed in claim 2 in which said fibrous material is selected from the group consisting of rock wool, silica fiber, ceramic fiber, and mixtures thereof. .Iaddend. .Iadd.11. Method as claimed in claim 2 in which said bag is made from a plastic selected from the group consisting of nylon, polyethylene, polypropylene, and combinations thereof. .Iaddend. .Iadd.12. Method of manufacturing a heat insulator which comprises the steps of wrapping a hermetically sealed bag about an inner casing to form an insert, said sealed bag containing a mass of fibrous material which has been compressed by vacuum-packing said fibrous material in the sealed bag; and then introducing said insert into an outer casing; and then unsealing said bag to permit said fibrous material to expand between the inner casing and the outer casing. 
     
     
        .Iaddend. .Iadd.13.  Method of manufacturing a heat insulator comprising the steps of: I. wrapping a hermetically sealed bag about an inner cylindrical casing to form an insert, said sealed bag containing a mass of fibrous material which has been compressed by vacuum-packing it in said sealed bag, said sealed bag being made from a plastic selected from the group consisting of nylon, polyethylene, polypropylene and combinations thereof, and said fibrous material being selected from the group consisting of rock wool, silica fiber, ceramic fiber and mixtures thereof; and then   II. introducing said insert into an outer cylindrical casing; and then   III. applying an amount of heat sufficient to destroy said sealed bag, the amount of heat being insufficient to damage said casing and fibrous material;   wherein, said mass of fibrous material is caused to fill the space between inner and outer cylindrical casing encircling a passage for the gas   
     
     
        exhausted from an automotive engine. .Iaddend. .Iadd.14.  Method of manufacturing a heat insulator comprising the steps of: I. wrapping a hermetically sealed bag about an inner cylindrical casing to form an insert, said sealed bag containing a mass of fibrous material which has been compressed by vacuum-packing it in said sealed bag, said sealed bag being made from a plastic selected from the group consisting of nylon, polyethylene, polypropylene and combinations thereof, and said fibrous material being selected from the group consisting of rock wool, silica fiber, ceramic fiber and mixtures thereof; and then   II. introducing said insert into an outer cylindrical casing; and then   III. applying an amount of heat sufficient to unseal said sealed bag, the amount of heat being insufficient to damage said casing and fibrous material;   wherein said mass of fibrous material is caused to fill the space between inner and outer cylindrical casing encircling a passage for the gas exhausted from an automotive engine. .Iaddend.