US3669157A - Shrinkable tubular fabric - Google Patents

Shrinkable tubular fabric Download PDF

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Publication number
US3669157A
US3669157A US3669157DA US3669157A US 3669157 A US3669157 A US 3669157A US 3669157D A US3669157D A US 3669157DA US 3669157 A US3669157 A US 3669157A
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United States
Prior art keywords
fabric
tubular fabric
tubular
warp yarns
heat
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Expired - Lifetime
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Inventor
Hubert C Woodall Jr
Horace L Freeman
Noah C Goodman
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Carolina Narrow Fabric Co
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Carolina Narrow Fabric Co
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Priority to US4199770A priority Critical
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Publication of US3669157A publication Critical patent/US3669157A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00Protection of pipes or objects of similar shape against external or internal damage or wear
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C61/00Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • B29C61/0658Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms consisting of fibrous plastics material, e.g. woven
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D3/00Woven fabrics characterised by their shape
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00Optical elements, e.g. lenses, prisms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00Tubular articles
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D2700/00Woven fabrics; Methods of weaving; Looms
    • D03D2700/03Tubular fabrics or bags; Endless fabrics

Abstract

A woven tubular fabric which is formed of a set of warp yarns extending longitudinally thereof and a filling yarn interwoven with the warp yarns and extending circularly around the tubular fabric. The filling yarn is heat shrinkable while the set of warp yarns is non-shrinkable so that the woven tubular fabric will shrink in a radial direction upon the application of heat, while the longitudinal dimension remains unchanged.

Description

[ 51 June 13, 1972 United States Patent Woodall, Jr. et al.

....l39/387 UX [54] SHRINKABLE TUBULAR FABRIC 3,242,554 3/1966 Raymond....................

3,020,935 2/1962 Balis..........

[72] Inventors: Hubert C. Woodall, Jr., Winston Salem; 910, 91 1/1909 Horace L. Freeman, Burlington; Noah C- 2,474,375 6/ 1949 Shearer et Goodman, Winston Salem, all of NC. 2,523,637 9/1950 Stanfield et al. [73] Assignee: Carolina Narrow Fabric Company, Win- 3457962 11/1965 Salem NC 1,747,715 2/1930 Hooper... [22] Filed; June 1, 1970 173,615 2/1876 Gillespie................................ [21] Appl. No.: 41,997

Primary Examiner-James Kee Chi Attorney-Parrott, Bell, Seltzer, Park & Gibson Related US. Application Data [63] Continuation-impart of Ser. No. 502,028, Oct. 22,

ABSTRACT 1 Claim, 4 Drawing Figures References Cited UNITED STATES PATENTS 3,096,560 7/1963 Liebig........................................28/72 hmnm iiiee e g.

i T n I a l. J. 5

SHRINKABLE TUBULAR FABRIC This application is a continuation-in-part of application Ser. No. 502,028, filed Oct. 22, 1965 by the same inventors, now abandoned.

The present invention relates to an improved tubular fabric. More particularly, the invention relates to a tubular woven fabric which may be positioned about an elongated article and radially shrunk by the application of heat into a closely conforming relationship with the elongated article, while maintaining the longitudinal dimension of the fabric.

The tubular fabric of the present invention finds utility in a large number of applications. For example, the fabric may be utilized as a protective or insulating covering for an elongated article such as a pipe or wire, or it may be utilized as a component in a laminated article such as a glass fishing rod, plastic pipe or the like. In addition, the fabric may be used to form a relatively rigid hollow tubular article having independent uses.

It has previously been proposed to employ shrinkable yarns in a woven tubular fabric wherein shrinkage occurs in all directions (i.e., both longitudinally and radially) such that the tubular fabric may assume the contours of a mating irregularly shaped elongated article. However, shrinkage in all directions makes it difficult to insure that the resulting longitudinal length of a pre-cut tubular fabric will conform to that of the mating article since the fabric is unconstrained in the longitudinal direction and the degree of shrinkage is therefore difficult to control. Thus it is not possible to sell the fabric in precut standard lengths. In addition, shrinkage in all directions requires that a relatively large amount of the tubular fabric be utilized to cover a given article, and thus the cost of the tubular fabric is relatively high.

Accordingly, it is an object of the present invention to provide a tubular fabric capable of shrinkage in a radial direction while maintaining substantially the same longitudinal dimen- 81011.

It is a further object of this invention to provide a tubular fabric which may be easily positioned about an elongated article and radially shrunk into closely conforming relationship to protect or insulate the article.

It is another object of this invention to provide a versatile tubular fabric which may be employed as a covering, a tubing, or as a component in the construction of numerous elongated articles.

These and other objects and advantages of the present invention are achieved in the embodiment illustrated herein by the provision of a tubular woven fabric comprising a set of non-shrinkable warp yarns extending longitudinally of the fabric and heat-shrinkable filling yarn extending circularly about the fabric. The fabric is adapted to be positioned over an elongated article, and upon the application of heat will radially shrink into a closely conforming relationship while maintaining its longitudinal dimension substantially unchanged.

Some of the objects of the invention having been stated, other objects will appear as the description proceeds, when taken in connection with the accompanying drawings, in which FIG. 1 is an enlarged side elevational view of a tubular fabric embodying the features of the present invention;

FIG. 2 is a sectional view taken substantially along the lines 22 of FIG. ll;

FIG. 3 is a side elevational view illustrating the tubular fabric of FIG. 1 after it has been shrunk about an elongated article, such as a mandrel; and

FIG. 4 is a sectional view taken substantially along the lines 44 of FIG. 3.

Referring to the drawings, a tubular woven fabric is illustrated generally at in FIGS. 1 and 2, and comprises a set of non-shrinkable warp yarns 12 extending longitudinally and substantially parallel to the axis of the fabric, and heat shrinkable filling yarn 14 extending circularly about the fabric and at substantially right angles to the warp yarns 12.

In FIGS. 3 and 4, a tubular fabric 10' is illustrated which represents'the fabric 10 after it has been subjected to sufi'lcient heat to shrink the filling yarn and thereby reduce its diameter to that of an elongated article on which it has been placed, such as a mandrel, indicated in dotted lines at 16. As will be apparent from the drawings, the longitudinal dimension A of the fabric 10' has not substantially changed from the corresponding dimension A of the fabric 10, while the diameter B thereof has been substantially reduced from the diameter B of the fabric 10.

The particular number of warp of filling yarns employed in a particular fabric will depend on the desired end use. Thus while a single shrinkable filling yarn has been shown in the drawings, it will be recognized that a plurality of similar filling yarns could be employed in the fabric. In addition, it has been found that an increase in the number of warp yarns for a given diameter will reduce the amount of shrinkage of the filling yarn. Thus, if a large amount of shrinkage is intended, a relatively small number of warp yarns should be employed.

The non-shrinkable warp yarns 12 may consist of any material that will provide the insulating, chemical, or mechanical properties required for the desired end use, and which do not appreciably shrink when subjected to heat, water, or other chemical action. Typical of such fabric materials are glass, asbestos, ceramic, metal wire, and the like.

The filling yarn 14 preferably comprises a heat shrinkable polymeric material. Examples of such materials are polyesters, such as polyethylene terephthalate, acrylics such as polyacrylonitrile, nylon, and polyolefins such as polypropylene and polyethylene. Nylon is a synthetic linear polymer produced by the reaction of .hexamethylene diamine with adipic acid, the molecule being; entirely adiphatic and based on the formation of polyamides. The various polymeric materials exhibit a wide range of shrinkages in response to heat, and the particular one chosen should depend on the temperature at which shrinkage should take place, the desired percentage of shrinkage of the tube, and the required strength of the finished product. As typical examples of properties of these materials, polyester fibers shrink approximately 15-17 percent at 300 F., acrylic fibers shrink approximately 10-l5 percent at 212 F., and polypropylene shrinks up to approximately 28 percent at 275 F.

In one embodiment of the present invention, the tubular fabric is utilized as a closely conforming protective or insulating covering for an elongated article such as a pipe, shaft, or wire. Coverings are commonly applied to the outer surface of such articles to provide electrical, chemical, or mechanical insulation or protection, and the tubular fabric of the present invention is ideally suited for such uses since it can be easily applied to the article and will result in a closely conforming, neat appearance. Also, the particular compositions of the fabric may be selected to include materials which contribute to the desired properties of the covering; for example, glass warp yarns could be utilized where a fire retardant covering is desirable.

To provide a substantially rigid tubular insulator or covering member for an elongated article such. as an electrical component, the tubular fabric may be impregnated with a heat settable resin, such as a polyester or epoxy resin. The fabric is then placed loosely over the object to be covered, and heat is applied to shrink the filling yarns and cure or set the resin. Al tematively, a two step shrinking procedure may be employed wherein the resin impregnated fabric is first placed over a mandrel which is slightly larger in diameter than the diameter on which the tubular fabric is to be ultimately placed. Heat is then applied to shrink the filling yarns and partially cure or set the resin to produce a tubular fabric which is sufficiently rigid to retain the shape of the mandrel. In this condition, it is adapted for shipping in commerce as a preformed tubular cover or insulator of a diameter slightly greater than the diameter of the article on which the tubular fabric is to be placed. The user then places it over the article such as a wire or pipe which is ultimately to be covered and the filling yarn shrunk a second time by the application of heat to form a tight fit over the article. Further details of the process employing a resin impregnated tubular fabric of this type may be obtained by reference to the US. Pat. to Wareham, No. 3,466,210.

The tubular fabric of this invention may also be utilized to form a hollow tubular article having independent uses. For example, if the warp yarns are fiber glass and the filling yarns are a heat shrinkable polymer, the fabric may be placed over a mandrel and, in a single heating operation the polymeric yarn shrunk to form a relatively rigid pipe-like article. Of course, the fabric could be impregnated with a heat settable resin or a suitable coating could be subsequently applied to the shrunken fabric to increase the rigidity of the resulting article. Such a fiber glass pipe may have many independent uses and applications, other than a covering for an elongated article.

The present invention may also be employed as a component in the construction of numerous elongated articles. For instance, the fabric could be filled with a lightweight material such as polystyrene foam and fiien subjected to a heating operation to shrink the filling yarns and thereby form a lightweight waterproof object which may serve as a water float. Further, the fabric may be shrunk about a bundle of fiber glass rods to form an elongated circular article such as a fiber glass fishing rod. Still further, the tubular fabric may serve as a strengthening component in a laminated elongated article such as a fiber glass pole-vaulting pole. In this latter case, the fact that the fabric of the invention will shrink into a closely conforming smooth covering is important, since the outer surface of the pole should be free from irregularities.

In still another embodiment of the present invention, the non-shrinkable warp yarns may be thin or fine metallic electrical conducting wires, such as silver, copper or aluminum. This embodiment would be particularly advantageous in an apparatus where it is necessary to run a very large number of electrical wires along the outer surface of an elongated member such as a shaft. In addition, non-metallic or insulating yarns could be alternated with the metallic wires in the warp so that the metallic wires are insulated from each other.

Typical applications of the tubular fabric have been discussed above. It should be evident however, that the fabric has an almost infinite number of potential uses. Also, the fabric may be made of any desired length or diameter depending on the desired end use. In addition, it will be evident that multiple layers of the tubular fabric could be sequentially applied over the elongated article to produce a covering or tubular article of substantial thickness.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation.

What is claimed is:

1. A tubular woven fabric comprising a set of non-shrinkable warp yarns formed from material selected from the group consisting of glass, asbestos, ceramic and metal, said warp yarns extending longitudinally of the tubular fabric, and heat shrinkable polymeric filling yarn extending circularly around the tubular fabric and substantially at right angles to the warp yarns, whereby the corresponding circular dimension of the tubular fabric may be reduced by the application of heat to the fabric while the longitudinal dimension remains substantially unchanged.

Claims (1)

1. A tubular woven fabric comprising a set of non-shrinkable warp yarns formed from material selected from the group consisting of glass, asbestos, ceramic and metal, said warp yarns extending longitudinally of the tubular fabric, and heat shrinkable polymeric filling yarn extending circularly around the tubular fabric and substantially at right angles to the warp yarns, whereby the corresponding circular dimension of the tubular fabric may be reduced by the application of heat to the fabric while the longitudinal dimension remains substantially unchanged.
US3669157D 1970-06-01 1970-06-01 Shrinkable tubular fabric Expired - Lifetime US3669157A (en)

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US3953640A (en) * 1973-05-09 1976-04-27 Takata Kojyo Co., Ltd. Self-shaping woven inflatable belt and method of production
US4034153A (en) * 1974-11-18 1977-07-05 Schweizerische Isola-Werke Electrical cable for transport vehicles and ships
US4323607A (en) * 1978-09-01 1982-04-06 Ube Industries, Ltd. Heat shrinkable covers
DE3150544A1 (en) * 1981-12-21 1983-06-30 Siemens Ag Insulating, waterproof cable end insulation
US4460086A (en) * 1979-10-01 1984-07-17 Ppg Industries, Inc. Tubular glass fiber package and method
GB2133639A (en) * 1983-01-06 1984-07-25 Raychem Ltd Recoverable article
GB2133740A (en) * 1983-01-06 1984-08-01 Raychem Ltd Dimensionally heat recoverable article
GB2134334A (en) * 1983-01-06 1984-08-08 Raychem Ltd Wrap-around recoverable article
EP0117026A2 (en) * 1983-01-06 1984-08-29 Raychem Limited Method of enclosing cables and pipes
GB2135836A (en) * 1983-01-06 1984-09-05 Raychem Ltd Cable splice basing including recoverable fabric sleeve
GB2145273A (en) * 1983-08-16 1985-03-20 Raychem Ltd Heat-recoverable article
EP0134864A2 (en) * 1983-09-16 1985-03-27 Walter A. Plummer Jr. Braided sleeving
EP0153823A2 (en) * 1984-02-07 1985-09-04 Raychem Limited Recoverable article for screening
US4604315A (en) * 1983-12-20 1986-08-05 Chicopee High bulk, biaxial elastic, heat shrunk fabric
EP0243985A2 (en) 1983-01-06 1987-11-04 RAYCHEM CORPORATION (a Delaware corporation) Method of making a recoverable composite structure
EP0265265A2 (en) * 1986-10-23 1988-04-27 Raychem Limited Heat-recoverable fabric article
US4741087A (en) * 1983-09-16 1988-05-03 Plummer Jr Walter A Method of making pre-expanded braided sleeving
US4771518A (en) * 1987-07-30 1988-09-20 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Tapered, tubular polyester fabric
US4816326A (en) * 1985-05-20 1989-03-28 Raychem Corporation Article comprising fibre
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US4977933A (en) * 1985-05-28 1990-12-18 Joss Company Circular loom for weaving ribbon-shaped materials
US5076871A (en) * 1990-01-11 1991-12-31 The Boeing Company Method of forming composite prepreg articles utilizing heat-shrinkable braided sleeves
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Cited By (112)

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Publication number Priority date Publication date Assignee Title
US3953640A (en) * 1973-05-09 1976-04-27 Takata Kojyo Co., Ltd. Self-shaping woven inflatable belt and method of production
US4034153A (en) * 1974-11-18 1977-07-05 Schweizerische Isola-Werke Electrical cable for transport vehicles and ships
US4323607A (en) * 1978-09-01 1982-04-06 Ube Industries, Ltd. Heat shrinkable covers
US4460086A (en) * 1979-10-01 1984-07-17 Ppg Industries, Inc. Tubular glass fiber package and method
DE3150544A1 (en) * 1981-12-21 1983-06-30 Siemens Ag Insulating, waterproof cable end insulation
DE3153480C2 (en) * 1981-12-21 1990-06-21 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De Watertight insulating covering for cable junctions
EP0272364A1 (en) * 1983-01-06 1988-06-29 Raychem Limited Method of forming a closure member for a recoverable article
GB2133740A (en) * 1983-01-06 1984-08-01 Raychem Ltd Dimensionally heat recoverable article
EP0115905A2 (en) * 1983-01-06 1984-08-15 Raychem Limited Dimensionally heat recoverable article
EP0116392A2 (en) 1983-01-06 1984-08-22 Raychem Limited Wrap-around recoverable article
EP0117026A2 (en) * 1983-01-06 1984-08-29 Raychem Limited Method of enclosing cables and pipes
GB2135836A (en) * 1983-01-06 1984-09-05 Raychem Ltd Cable splice basing including recoverable fabric sleeve
US5599418A (en) * 1983-01-06 1997-02-04 Raychem Limited Method for making recoverable article for encapsulation
EP0427356A3 (en) * 1983-01-06 1992-09-02 Raychem Limited Wrap-around recoverable article
EP0427356A2 (en) * 1983-01-06 1991-05-15 Raychem Limited Wrap-around recoverable article
EP0115905A3 (en) * 1983-01-06 1985-10-09 Raychem Limited Dimensionally heat recoverable article
EP0117026A3 (en) * 1983-01-06 1985-10-09 Raychem Limited Heat-recoverable article
EP0116392A3 (en) * 1983-01-06 1985-10-16 Raychem Limited Wrap-around recoverable article
US5002822A (en) * 1983-01-06 1991-03-26 Pithouse Kenneth B Recoverable article for encapsulation
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US4626458A (en) * 1983-01-06 1986-12-02 Raychem Limited Recoverable article for encapsulation
US4631098A (en) * 1983-01-06 1986-12-23 Raychem Limited Heat-recoverable article
GB2133639A (en) * 1983-01-06 1984-07-25 Raychem Ltd Recoverable article
US4820561A (en) * 1983-01-06 1989-04-11 Raychem Corporation Recoverable article for encapsulation
EP0243985A2 (en) 1983-01-06 1987-11-04 RAYCHEM CORPORATION (a Delaware corporation) Method of making a recoverable composite structure
US4761193A (en) * 1983-01-06 1988-08-02 Raychem Limited Recoverable article for encapsulation
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