US2798510A - Conduit construction - Google Patents
Conduit construction Download PDFInfo
- Publication number
- US2798510A US2798510A US522678A US52267855A US2798510A US 2798510 A US2798510 A US 2798510A US 522678 A US522678 A US 522678A US 52267855 A US52267855 A US 52267855A US 2798510 A US2798510 A US 2798510A
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- US
- United States
- Prior art keywords
- conduit
- tubular body
- paper
- bonded
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/143—Pre-insulated pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S138/00—Pipes and tubular conduits
- Y10S138/10—Metal foil
Definitions
- the paper conduit constructed according to the present invention is adapted especially for use in conveying a fluid medium at various temperatures, such as a precooled air medium in an air conditioning system.
- a fluid medium is usually conveyed through ducts for quite a distance and it is, therefore important that the temperature of the fluid medium is not adversely affected by the surrounding atmospheric air conditions until this fluid medium has reached the area to be conditioned thereby.
- the paper conduit described in detail below may also be used for other purposes besides air conditioning and in which good heat insulating properties are required. 1
- a conduit is constructed from concentric paper tubes having thermal insulating material such as for example, glass fiber, mineral wool or the like, arranged between the tubes to provide a conduit of light weight, and of substantial strength and stiffness, for conveying a fluid medium and protecting it from adverse effects by the surrounding atmospheric air conditions.
- thermal insulating material such as for example, glass fiber, mineral wool or the like
- Fig. 1 is an elevation of a short length of conduit constructed in accordance with the present invention
- Fig. 2 is a fragmentary sectional detail taken generally at 22 in Fig. 1;
- Fig. 3 is an elevation, partly in section, of the conduit shown in Fig. 1;
- Fig. 4 is a fragmentary sectional detail similar to Fig. 2 but showing a modified embodiment of the conduit construction of the present invention.
- Fig. 5 is a further fragmentary sectional detail similar to Fig. 2 but showing a still further modified embodiment of the conduit construction of the present invention.
- the illustrated embodiment of the present invention comprises a conduit indicated generally by the reference numeral 10, which is formed of two concentric tubular bodies 12 and 14 and a layer of insulating material 16, such as glass fiber, mineral wool or the like, sandwiched between the tubular bodies.
- the inner tubular body 12 of the conduit is preferably formed by spirally winding a plurality of paper strips in conventional superimposed relationship to form a laminated or multi-ply paperboard tube of desired length and thickness.
- the spirally wound paper strips are bonded together by means of a suitable adhesive interposed between them as they are wound, so that the result ing multi-ply tube wall is of sufficient thickness to provide the proper strength and stiffness necessary for the conduit 10.
- the inner tubular body 12 of the conduit 10 is preferably provided with a liner 18 of aluminum or other metal foil bonded to one face of the body 12.
- This metal foil liner prevents contact with theinner wall of the paperboard tubular body 12, of any condensation of the moisture content of the fluid medium being conveyed through the conduit 10.
- the metal foil also has the desirable properties of flame retarding, heat reflecting and low frictional losses to air flow.
- the aluminum of other metal foil in the form of a strip may be bonded to the surface of the paper strip that forms the inner spiral winding of the tubular body 12, so that the liner 18 is automatically formed thereon as the paper strips are wound to form the tubular body 12.
- the application of the layer of insulating material 16 between the tubular bodies 12 and 14 of the conduit 10 may be carried out conveniently by spirally winding a strip of such insulating material on the outer wall face of the tubular body 12 so as to form a layer of suflicient thickness to provide the proper insulation desired.
- the strip of insulating material forming the layer 16 may be bonded to the outer wall face of the tubular body 12 by means of a suitable adhesive interposed therebetween as the insulation is wound on the outer face of the tubular body 12.
- This insulating material may be obtained commercially in the form of a sheet made of two paper plies and a layer of insulating material bonded between them, which sheet of insulating material may be cut into strips in order to be spirally wound on the tube 12 as shown in Fig. 3.
- the outer tubular body 14 is formed by employing a two-ply paper sheet 20, such as kraft paper, having a layer of asphalt between the plies.
- This paper sheet 20 may be cut into strips which are spirally wound on the insulation layer 16 and bonded thereto by a suitable adhesive interposed therebetween.
- the two-ply paper with asphalt therebetween functions as a vapor barrier for preventing moisture in the surrounding atmosphere from penetrating the insulation layer and damaging its insulating properties.
- this outer tubular body 14 may be a spirally wound paper tube 22, as shown in Fig. 4, the same as the tubular body 12, and may be bonded to the insulation layer 16 in the same manner as before.
- the outer tubular body 14 may be a spirally wound double corrugated paperboard strip 24, which provides additional insulation by the dead air spaces or air cells 26 formed by the corrugations between their facing sheets 28, and may be bonded to the insulation layer 16 and to a twoply paper sheet 20 with asphalt in between.
- the conduit 10 constructed in accordance with the present invention may be formed in any desired length and may be cut into shorter lengths by conventional means, such as a saw, without affecting its properties.
- a conduit for conveying a fluid medium at various temperatures comprising an inner, spirally wound paper tubular body, a spirally wound liner of metal foil on the inner face of said tubular body providing a smooth interior surface and preventing condensate from coming into contact with said tubular body, a layer of glass fiber insulating material spirally wound on the outer face of said inner tubular body and bonded thereon, and an outer paper tubular body surrounding said layer of insulating material and bonded thereto, whereby the temperature of the fluid medium conveyed through said conduit is protected from surrounding atmospheric conditions.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Laminated Bodies (AREA)
Description
July 9, 1957 J. H. MARTIN ET AL 2,798,510
CONDUIT CONSTRUCTION Filed July 18, 1955 JOHN ATTORNEYJ' United States Patent coNDUIT CONSTRUCTION John H. Martin and Edward s. Reid, Hartsville, s. c., assignors to Sonoco Products Company, a corporation of South Carolina Application July 18, 1955, Serial No. 522,678
3 Claims. (Cl. 138--78) This invention relates to conduit construction, and more particularly to paper conduit construction with exceptional heat insulating properties.
The paper conduit constructed according to the present invention is adapted especially for use in conveying a fluid medium at various temperatures, such as a precooled air medium in an air conditioning system. In such a system the fluid medium is usually conveyed through ducts for quite a distance and it is, therefore important that the temperature of the fluid medium is not adversely affected by the surrounding atmospheric air conditions until this fluid medium has reached the area to be conditioned thereby. It will be apparent that the paper conduit described in detail below may also be used for other purposes besides air conditioning and in which good heat insulating properties are required. 1
In accordance with the present invention a conduit is constructed from concentric paper tubes having thermal insulating material such as for example, glass fiber, mineral wool or the like, arranged between the tubes to provide a conduit of light weight, and of substantial strength and stiffness, for conveying a fluid medium and protecting it from adverse effects by the surrounding atmospheric air conditions.
The present invention is described in further detail below in connection with the accompanying drawings in which:
Fig. 1 is an elevation of a short length of conduit constructed in accordance with the present invention;
Fig. 2 is a fragmentary sectional detail taken generally at 22 in Fig. 1;
Fig. 3 is an elevation, partly in section, of the conduit shown in Fig. 1;
Fig. 4 is a fragmentary sectional detail similar to Fig. 2 but showing a modified embodiment of the conduit construction of the present invention; and
Fig. 5 is a further fragmentary sectional detail similar to Fig. 2 but showing a still further modified embodiment of the conduit construction of the present invention.
Referring now to the drawings, the illustrated embodiment of the present invention comprises a conduit indicated generally by the reference numeral 10, which is formed of two concentric tubular bodies 12 and 14 and a layer of insulating material 16, such as glass fiber, mineral wool or the like, sandwiched between the tubular bodies. The inner tubular body 12 of the conduit is preferably formed by spirally winding a plurality of paper strips in conventional superimposed relationship to form a laminated or multi-ply paperboard tube of desired length and thickness. The spirally wound paper strips are bonded together by means of a suitable adhesive interposed between them as they are wound, so that the result ing multi-ply tube wall is of sufficient thickness to provide the proper strength and stiffness necessary for the conduit 10.
In addition, the inner tubular body 12 of the conduit 10 is preferably provided with a liner 18 of aluminum or other metal foil bonded to one face of the body 12. This metal foil liner prevents contact with theinner wall of the paperboard tubular body 12, of any condensation of the moisture content of the fluid medium being conveyed through the conduit 10. The metal foil also has the desirable properties of flame retarding, heat reflecting and low frictional losses to air flow.
Preferably, the aluminum of other metal foil in the form of a strip may be bonded to the surface of the paper strip that forms the inner spiral winding of the tubular body 12, so that the liner 18 is automatically formed thereon as the paper strips are wound to form the tubular body 12.
Next, the application of the layer of insulating material 16 between the tubular bodies 12 and 14 of the conduit 10 may be carried out conveniently by spirally winding a strip of such insulating material on the outer wall face of the tubular body 12 so as to form a layer of suflicient thickness to provide the proper insulation desired. Furthermore, the strip of insulating material forming the layer 16 may be bonded to the outer wall face of the tubular body 12 by means of a suitable adhesive interposed therebetween as the insulation is wound on the outer face of the tubular body 12.
This insulating material, however, may be obtained commercially in the form of a sheet made of two paper plies and a layer of insulating material bonded between them, which sheet of insulating material may be cut into strips in order to be spirally wound on the tube 12 as shown in Fig. 3.
Following the application of the layer 16 on the tubular body 12, the outer tubular body 14 is formed by employing a two-ply paper sheet 20, such as kraft paper, having a layer of asphalt between the plies. This paper sheet 20 may be cut into strips which are spirally wound on the insulation layer 16 and bonded thereto bya suitable adhesive interposed therebetween.
The two-ply paper with asphalt therebetween functions as a vapor barrier for preventing moisture in the surrounding atmosphere from penetrating the insulation layer and damaging its insulating properties.
Alternatively, this outer tubular body 14 may be a spirally wound paper tube 22, as shown in Fig. 4, the same as the tubular body 12, and may be bonded to the insulation layer 16 in the same manner as before.
In a further modified form as shown in Fig. 5, the outer tubular body 14 may be a spirally wound double corrugated paperboard strip 24, which provides additional insulation by the dead air spaces or air cells 26 formed by the corrugations between their facing sheets 28, and may be bonded to the insulation layer 16 and to a twoply paper sheet 20 with asphalt in between.
The conduit 10 constructed in accordance with the present invention may be formed in any desired length and may be cut into shorter lengths by conventional means, such as a saw, without affecting its properties.
The present invention has been described above for purposes of illustration only, and is not intended to be limited by this description except as defined in the appended claims.
We claim:
1. A conduit for conveying a fluid medium at various temperatures comprising an inner, spirally wound paper tubular body, a spirally wound liner of metal foil on the inner face of said tubular body providing a smooth interior surface and preventing condensate from coming into contact with said tubular body, a layer of glass fiber insulating material spirally wound on the outer face of said inner tubular body and bonded thereon, and an outer paper tubular body surrounding said layer of insulating material and bonded thereto, whereby the temperature of the fluid medium conveyed through said conduit is protected from surrounding atmospheric conditions.
2. A conduit constructed according to claim 1 and further characterized, in that said outer paper tubular body isrformed of a tvyo;p1y,paper;she t having a.laye.r of asphalt; in between.
3. A conduit constructed according ;to claim, 1 and further characterized in :that ,said outer :paper tubular body is formed of a double corrugated paperboard and of a twp-ply paper with asphalt therebetwcen.
References Cited in the file of this patent UNITED STATES PATENTS Keller Aug. 29, Seigle Nov. 23, Magill Sept. 20, Hatch May 23, Hlavaty Nov. 10, Douglas Aug. 8, Marc Jan. 13 Stuart et a1. June 3,
FOREIGN PATENTS France May 31,
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US522678A US2798510A (en) | 1955-07-18 | 1955-07-18 | Conduit construction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US522678A US2798510A (en) | 1955-07-18 | 1955-07-18 | Conduit construction |
Publications (1)
Publication Number | Publication Date |
---|---|
US2798510A true US2798510A (en) | 1957-07-09 |
Family
ID=24081865
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US522678A Expired - Lifetime US2798510A (en) | 1955-07-18 | 1955-07-18 | Conduit construction |
Country Status (1)
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US (1) | US2798510A (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2954803A (en) * | 1955-09-02 | 1960-10-04 | Foil Process Corp | Tubular metallic foil products and method of producing them |
US3044498A (en) * | 1957-03-25 | 1962-07-17 | Foil Process Corp | Foil tubing |
US3095014A (en) * | 1958-07-02 | 1963-06-25 | Conch Int Methane Ltd | Stave secured sectional insulated conduit |
US3175586A (en) * | 1960-08-15 | 1965-03-30 | Tatsch Richard | Conduit and method of manufacture |
US3178088A (en) * | 1961-05-30 | 1965-04-13 | Ultra Kunststoffverarbeitung G | Lined, wound tubular containers or pipes |
US3228308A (en) * | 1963-04-15 | 1966-01-11 | Denenberg Maurice | Method of making a laminate article |
US3270778A (en) * | 1963-08-14 | 1966-09-06 | William A Foll | Flexible paper tube |
US3301926A (en) * | 1964-04-08 | 1967-01-31 | Gateway Erectors Inc | Method of fabricating a self-braced concrete form |
US3844315A (en) * | 1973-03-26 | 1974-10-29 | J Williams | Laminated conduit and system |
US3911961A (en) * | 1970-09-25 | 1975-10-14 | Federal Mogul Corp | High temperature duct insulator and method of making same |
DE3433461A1 (en) * | 1984-03-02 | 1985-09-05 | Waller Innovation AB, Hofors | DEVICE ON A CONSTRUCTION MACHINE |
US4602722A (en) * | 1985-03-25 | 1986-07-29 | Ives Frank E | Leak-resistant fiberglass tank and method of making the same |
US4660738A (en) * | 1985-03-25 | 1987-04-28 | Ives Frank E | Leak-resistant fiberglass tank and method of making the same |
US5750225A (en) * | 1995-05-26 | 1998-05-12 | Compac Corporation | Laminated vapor barrier |
US20070023097A1 (en) * | 2005-08-01 | 2007-02-01 | Nobel Plastiques | Underground pipe for transporting fuel and a method of fabricating it |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1924609A (en) * | 1930-10-06 | 1933-08-29 | Richardson Co | Cylindrical and the like container made of composite materials |
FR817841A (en) * | 1936-02-15 | 1937-09-11 | Saint Gobain | Composite sheets |
US2099756A (en) * | 1935-10-29 | 1937-11-23 | Johns Manville | Air duct |
US2130355A (en) * | 1936-06-27 | 1938-09-20 | American Can Co | Method of forming moistureproof and greaseproof containers |
US2159948A (en) * | 1937-08-24 | 1939-05-23 | Fibre Can Machinery Corp | Fiber can body |
US2301657A (en) * | 1938-06-10 | 1942-11-10 | Rudolph F Hlavaty | Insulating container |
US2355584A (en) * | 1939-05-15 | 1944-08-08 | Cleveland Container Company | Tubular container |
US2434465A (en) * | 1944-05-20 | 1948-01-13 | Carey Philip Mfg Co | Manufacture of ducts |
US2555380A (en) * | 1940-10-26 | 1951-06-05 | Elizabeth R B Stuart | Container |
-
1955
- 1955-07-18 US US522678A patent/US2798510A/en not_active Expired - Lifetime
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1924609A (en) * | 1930-10-06 | 1933-08-29 | Richardson Co | Cylindrical and the like container made of composite materials |
US2099756A (en) * | 1935-10-29 | 1937-11-23 | Johns Manville | Air duct |
FR817841A (en) * | 1936-02-15 | 1937-09-11 | Saint Gobain | Composite sheets |
US2130355A (en) * | 1936-06-27 | 1938-09-20 | American Can Co | Method of forming moistureproof and greaseproof containers |
US2159948A (en) * | 1937-08-24 | 1939-05-23 | Fibre Can Machinery Corp | Fiber can body |
US2301657A (en) * | 1938-06-10 | 1942-11-10 | Rudolph F Hlavaty | Insulating container |
US2355584A (en) * | 1939-05-15 | 1944-08-08 | Cleveland Container Company | Tubular container |
US2555380A (en) * | 1940-10-26 | 1951-06-05 | Elizabeth R B Stuart | Container |
US2434465A (en) * | 1944-05-20 | 1948-01-13 | Carey Philip Mfg Co | Manufacture of ducts |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2954803A (en) * | 1955-09-02 | 1960-10-04 | Foil Process Corp | Tubular metallic foil products and method of producing them |
US3044498A (en) * | 1957-03-25 | 1962-07-17 | Foil Process Corp | Foil tubing |
US3095014A (en) * | 1958-07-02 | 1963-06-25 | Conch Int Methane Ltd | Stave secured sectional insulated conduit |
US3175586A (en) * | 1960-08-15 | 1965-03-30 | Tatsch Richard | Conduit and method of manufacture |
US3178088A (en) * | 1961-05-30 | 1965-04-13 | Ultra Kunststoffverarbeitung G | Lined, wound tubular containers or pipes |
US3228308A (en) * | 1963-04-15 | 1966-01-11 | Denenberg Maurice | Method of making a laminate article |
US3270778A (en) * | 1963-08-14 | 1966-09-06 | William A Foll | Flexible paper tube |
US3301926A (en) * | 1964-04-08 | 1967-01-31 | Gateway Erectors Inc | Method of fabricating a self-braced concrete form |
US3911961A (en) * | 1970-09-25 | 1975-10-14 | Federal Mogul Corp | High temperature duct insulator and method of making same |
US3844315A (en) * | 1973-03-26 | 1974-10-29 | J Williams | Laminated conduit and system |
DE3433461A1 (en) * | 1984-03-02 | 1985-09-05 | Waller Innovation AB, Hofors | DEVICE ON A CONSTRUCTION MACHINE |
US4602722A (en) * | 1985-03-25 | 1986-07-29 | Ives Frank E | Leak-resistant fiberglass tank and method of making the same |
US4660738A (en) * | 1985-03-25 | 1987-04-28 | Ives Frank E | Leak-resistant fiberglass tank and method of making the same |
US5750225A (en) * | 1995-05-26 | 1998-05-12 | Compac Corporation | Laminated vapor barrier |
US20070023097A1 (en) * | 2005-08-01 | 2007-02-01 | Nobel Plastiques | Underground pipe for transporting fuel and a method of fabricating it |
FR2889285A1 (en) * | 2005-08-01 | 2007-02-02 | Nobel Plastiques Soc Par Actio | Fuel e.g. gasoline, transport pipeline for e.g. service station, has outer tube with inner and outer layers, where inner layer is helically corrugated and is free with respect to inner tube for forming spacer unit |
EP1750048A2 (en) * | 2005-08-01 | 2007-02-07 | Nobel Plastiques | Pipe and manufacturing method of said pipe |
EP1750048A3 (en) * | 2005-08-01 | 2007-02-21 | Nobel Plastiques | Pipe and manufacturing method of said pipe |
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