US2798510A - Conduit construction - Google Patents

Conduit construction Download PDF

Info

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
Authority
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
Application number
US522678A
Inventor
John H Martin
Edward S Reid
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonoco Products Co
Original Assignee
Sonoco Products Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sonoco Products Co filed Critical Sonoco Products Co
Priority to US522678A priority Critical patent/US2798510A/en
Application granted granted Critical
Publication of US2798510A publication Critical patent/US2798510A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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
    • 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.

Landscapes

  • 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,
US522678A 1955-07-18 1955-07-18 Conduit construction Expired - Lifetime US2798510A (en)

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)

Country Link
US (1) US2798510A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (9)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
US2798510A (en) Conduit construction
US3212529A (en) Collapsible duct section
US2221309A (en) Insulating element
US2238022A (en) Insulating material and structure
US7222645B2 (en) Duct insulation having condensate wicking
US9023444B2 (en) Thermal insulating material
US2330941A (en) Insulation
US3818948A (en) Flexible and foldable conduit
US3222243A (en) Thermal insulation
US3768523A (en) Ducting
US5325893A (en) Air duct and paper therefor
US2179057A (en) Heat insulation
US4823845A (en) Pipe insulation
US3058860A (en) Snap-on metal jacketed pipe insulation
US1890418A (en) Heat insulation
US5549942A (en) Sealed ductboard
BG62948B1 (en) Method for pipe insulation by a tubular sheathing
US4140338A (en) High temperature expansion joint
EP0877892B1 (en) Heat reflective sleeve
US2962402A (en) Thermal insulation covering for pipes and the like
JP6912202B2 (en) duct
CA3061658C (en) Insulated flexible duct using compressible core spacer and method of use
US20190316345A1 (en) Vacuum insulation panel
US2159948A (en) Fiber can body
US3187778A (en) Duct insulation