US2129110A - Heat insulating tape - Google Patents

Description

Sept. 6, 1938. J. M. WEAVER I 2,129,110

HEAT INSULATING TAPE Filed April 26. 19:57

Patented Sept. 6; 1938 UNITED STATES PATENT OFFICE HEAT INSULATING TAPE,

Application April 26, 1937, Serial No. 138,983

6 Claims.

This invention relates to improvements in thermal and waterproofed insulation and method of making same, and more particularly to a heat insulating tape or wrappingpadapted to be applied to pipes, conduits or containers, such as employed in heating, refrigerating and other fluid systems in or through which fluids pass or are retained while maintained under relatively high or low temperatures.

10; Various forms of wrappings or tapes have heretofore been employed for this purpose. These tapes usually comprise a body or core oi insulating material enclosed in a jacket or sheath of fibrous textile material such as asbestos. Most of these tapes are so constructed that when the jackets are usually applied with overlapping edges adhesively united oi stitched together, the completed tape is rendered somewhat inflexible and does not permit it to properly adapt itself to wrapping around pipes of small diameters without buckling. Moreover, there is a tendency for the tape to buckle due to the inability of the Jacket or sheath to conform to the curvature of the pipe. This results in a very inemcient insulation due to leakage between adjacent convolutions of the tapes, and the possibility of seepage of moisture between the tape and pipe or container. Furthermore, it is recognized as almost a physical impossibility to wrap insulating so tape around a pipe of small diameter so that adjacent convolutions abut sumciently tight to provide a seal against leakageof heat and also prevent moisture from seeping under the tape.

Cine of the objects of this invention is to pro vide a novel and improved insulation of the character indicated, that edectively eliminates the foregoing dimculties.

Another object is to provide an improved insulating tape that is flexible and capable of readily adapting itself to contours of pipes of small diameters without buckling. l

A further object resides in the provision of an improved insulating tape characterized by a sheath or jacket of fibrous fabric cut on the bias to permit the tape to readily adapt itselif to prop or use on pipes of small diameters.

Still another object is to provide an improved insulating tape having a Jacket of fibrous fabric formed with overlappingedges to form a lateral to extension to serve as a sealing flap upon which the next convolution of tape is wrapped, to effectively prevent leakage of heat and seepage of moisture to the interior of the tape.

As a still further object of this invention, the

55 body oi the tape includes a plurality of spaced- (Cl. lit-4t) apart longitudinally extending strands of asbestos yarn or cord around which is wrapped adhesively united thereto, a soft flexible asbestos roving. This construction is such as to prevent collapsing or displacement of the component parts 5 either in the process of being encased in a jacket or sheath, or during its application to a pipe, conduit or container. 1

Other objects and advantages will be apparent from the following description, taken in conneo- 10 tion with the accompanying drawing in which:

Fig. l is an elevational view of a section of pipe covered by the insulating tape constituting the present invention.

Fig. 2 is a fragmentary face view of a piece of 15 the tape, parts being broken away to show details of construction.

Fig. 3 is a transverse section through the tape, f taken as indicated at line 3-3 on Fig. 2.

In the illustrated embodiment of my invention 20 the tape designated at Ill, is shown spirally wrapped around a section of pipe H, containing fluids of relatively high or relatively low temperatures. Although the tape is shown applied to a pipe, it is to be understood that it is equally suit as able for use with containers, and various forms of receptacles.

The tape comprises a flat elongated body composed .of a plurality (herein shown as three) spaced apart substantially parallel, longitudinah 3o 1y extending strands it, of asbestos yarn or cord around which is spirally wound a soft asbestos roving it. The roving is adhesively united to the asbestos strands to produce a firm but flexible body, and which facilitates the application 35 of an amusing jacket or sheath it.

In forming the body the strands I! of yarn or cord are drawn through a receptacle containing suitable adhesive, such as. liquid rubber latex, or a rubber compound, or silicate of soda, and the 40 coated strands then engage suitable means for removing the excess quantity of adhesive. lie the adhesive is still in tacky condition they are maintained under tension in parallel spacedapart relation, and constitute the core around which is spirally wound the soft loosely fashioned asbestos roving it which becomes adhesively attached to the strands. An insulating body thus formed possesses the characteristic of firmness, and flexibility which permits it to be hellcally 5o wound in a manner that avoids distortion by compression and buckling.

The sheath It, is formed from a strip 01 asbestos cloth, wrapped around the insulating body and is of such size that marginal edges are overlapped beyond the longitudinal edge of the; body. and adhesively united together to form a sealing flap It. To positively insure against separation of the marginal edges, due to excessive heat, said edges are additionally secured together by a row of stitching ll, with asbestos thread. When the tape provided with this form of jacket is applied, the sealing flap ll oi one convolution of the tape overlaps the next adjacent convolution, as seen in dotted outline in Fig. 3, to form an efflcient seal against the escape of heat, end else prevents seep-ace of moisture under time tape. This con struction facilitates the application of the tape and due to the novel form of insulating ioody permits it to readily conform to curved surfaces of pipes oi even relatively small diameter.

In some tapes as heretofore constructed, the

sheath is stitched intermediate the longitudinal edges, which result in needle punctures in the fabric. it has been found that in such constructions capillary action would conduct water through the needle punctures and thereby cause the body of the tagoe to become moist; this occurs particularly when the pipe or container is out of service, and becomes cold and. Wet. 'Ifliis dimculty is completely obviated by the form of sheath above described.

The asbestos cloth forming the sheath is out on a bias so as to further enable the tape to readily adapt itself to a pipe, container, etc, as it avoids stresses being set up in the sheath.

When it is desired that the tape also possess watetpi'ooflng charactetistics, the asbestos cloth constituting the sheath it, may be coated on one side with waterproofing material, such as rubber compound, such as indicated at it, on the inner side of the sheath, oi" the asbestos strip may be cut from asbestos cloth so coated. it is to be understood, however, that i do not intend to restrict this, invention to the form of sheath herein disclosed, as manifestly a variety of sheaths or jackets may be employeci, such as a sheath woven or braided directly around the insulating body, or a sheath folded or around the body.

The insulating body constituting this invention, one to its firm, flexible character, may also be used as an insulating tape without being encased in a sheath. For silo-"n purpose the insulating body, which in itselil oecornes the tape ce spirally wrapped around the pine, container, etc, and ii desired may be protected by a suitable covering, which may consist of asbestos woven tape, a jacket of asoestosclotli, a sheet metal jacket, or it may be covered by a cloth sewed or aioano otherwise secured thereon. If desired, such a covering may be coated or painted to render, it impervious to moisture.

Although I have herein disclosed certain embodiments of my invention, manifestly it is capabio of modification and rearrangement without departing from the spirit and scope thereof. 1 do not, therefore, wish to be Luiderstood as limiting the invention to the precise disclosures herein, except as it may be so limited in the appended claims. I

I claim as my invention:

1. An insulating tape adapted to be wrapped about a pipe, conduit or container, comprising a. plurality of speced-apart longitudinally extend= ins strands 'or cords, and soft material wound around said strands.

2. An insulating tape adapted f" rapped about a pipe, conduit or container, co icing a plurality of spaced-apart longitudinally ciitendlng strands or cords, and soft asbestos materiel spirally wound around said strands.

3. An insulating tape adapted to be wrapped about a pipe, conduit or container, comprising a plurality of spaced-apart longitudinally extending stranm of asbestos yarn or cord, and soft asbestos material wound around and adhesively united to said strands.

An insulating tape adapted to be wrapped about a. pipe, conduit or container, comprising a plurality of spacezi-apart longitudinally extending strands of asbestos grain or cord, and soft asbestos material wound spirally around adhesively united to said strands.

5. An insulating tape to be wrapped about a pipe, conduit or containei', comprising an elongated body including a plu ality of spaced apart longitudinally attending strands end soft asbestos materiel spirally wound atomic; strands, and a jacket for enclosing the body formed of asbestos cloth having edges extending laterally beyond the edge of the body in overlapping relation and adheslvely united together,

overlapping edges of the locket being additionally secured by stitching with asbestos thread.

e. An insulating adanted to be wrapped about a pine, conduit or container, comprising an elongated oocly including a plurality of spaced e oart longitudinally extending strands of asbestos yarn or cord, and a sott asoestosrotlng wound. spirally around said strands, and an asbestos jacket enclosin said body, said locket being formed of cloth out on a bias.

JESSE M. WEAVER.

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