KR100993177B1 - Multiple layer insulating sleeve - Google Patents

Abstract

The present invention relates to multilayer sleeves for insulating or protecting extension substrates. The sleeves are continuously knitted into other sections completely joined end to end, which sections are formed of other fibrous members selected for proper characteristics. The sleeves are formed in a multilayer configuration by folding the sleeves back inward to coaxially place one section within the other sleeve. Sleeve ends can be finished with the welts to prevent loosening and can be used as clinches on elongated substrates. Rib knits are used to form insulated air pockets in the longitudinal direction along the sleeves to increase insulation efficiency.

Description

Multilayer Insulation Sleeve {MULTIPLE LAYER INSULATING SLEEVE}

This application claims priority to US Provisional Application No. 60 / 390,223, filed June 20, 2002.

The present invention relates to a sleeve for insulating flexible sleeving products, in particular a tubular member such as an automatic exhaust gas recirculation device. Other typical applications of the present invention include thermal protection of sophisticated tubular instruments and acoustic insulation of tubular devices.

Lightweight sleeves knitted, woven or braided with large yarns, such as the insulation of elongated tubular items, are known. A typical application of this sleeving is the isolation of the exhaust gas recirculation devices in order to minimize damage to other automatic elements in which each device is placed in close proximity. Products of the type mentioned are used to maintain spirally insulating insulation sleeves with relatively large diameter spiral extending warp elements away from insulated items, creating air gaps to keep heating spots constant and to increase the product's insulation capability. US Pat. No. 5,671,649. Another form of sleeving is disclosed in US Pat. No. 5,849,379. The sleeve disclosed in this patent combines a comb-like wire frame formed between an insulated item and an insulating material and also formed between layers of insulating material. The product is a split sleeve that facilitates installation on previously installed tubular heating sources. The inner wire armature is used as a spacer layer to maintain a space between the tubular heating source and the inner layer of the sleeve. Although the described products meet some of the need for a sleeve that protects devices from temperatures between about 1000 ° F and 1800 ° F, they are easy to manufacture, inexpensive, light in weight, and efficiently insulate the seal. There is a continuing need for sleeving sleeve devices.

The present invention relates to a sleeve for receiving elongated items. The sleeve includes a first flexible tubular segment consisting of fibrous members entangled with one another with opposing cross sections, and second flexible tubular segments consisting of fibrous members entangled with one another with opposing cross sections. One cross section of the first segment is coupled to one end of the second segment, the second segment being drawn coaxially and formed between the segments in the first segment to form inner and outer recognition layers surrounding the central space. And have an inverse fold shape defining one end of the sleeve.

In the sleeve according to the invention, the first segment may be composed of first fibrous members, and the second segment may be spherical with second fibrous members different from the first fibrous members. Fibrous members have a number of features, including material properties such as material type, strength, strength, abrasion resistance, heat resistance and thermal heat transfers, as well as physical properties such as denier, color and uniformity in interwoven fashion. It may be different in one or more of these. For example, when intertwined by a knit, the density or type of knit structure used may be varied by the type of braid used in each segment when braided.

Preferably, the first and second segments are approximately equal in strength, and the other ends of the first and second segments are disposed adjacent to each other to define the other end of the sleeve.

The sleeve may comprise a plurality of ribs formed longitudinally along one or both of the first or second segments. When formed on the second segment, the ribs preferably face outward from the central space and engage the first segment to separate the layers and form a plurality of air pockets between these layers. When formed on the first segment, the ribs preferably face inward toward the central space and engage the second segment to form air pockets between the layers of the first and second segments.

The sleeve can include additional segments. For example, a third tubular segment comprising intertwined fibrous members and having opposite ends can be joined to the other end of the first segment. The third segment may be drawn coaxially within the first segment to form other inner and outer adjacent layers surrounding the central space, such that the other reverse fold is the other end of the sleeve between the third and first segments. Is formed. The third segment may be drawn coaxially on the first segment to form another outer layer surrounding the inner and outer adjacent layers. Thus, another reverse fold is formed between the third and first segments that define the other end of the sleeve.

The fibrous members comprising the third segment may differ from other segments including the first and second segments with some of the features described above.

In another embodiment, the sleeve comprises elongate flexible continuous tubes comprising a plurality of basic fibrous members intertwined with one another. The first portion of the tube has a plurality of first fibrous members intertwined with the basic fibrous members, and the second portion of the tube has a plurality of second fibrous members interwoven with the basic fibrous members. The tube is folded back with the first portion of the tube disposed in the second portion of the tube.

Preferably, the first portion is disposed in proportion to the second portion along the tube such that the portion of the basic fibrous members of the continuous tube is barely exposed. The reverse fold is advantageously disposed between the first and second parts.

The sleeve may comprise a third portion of the tube having a plurality of third fibrous members intertwined with the basic fibrous members. In this embodiment, the second portion is disposed between the first and third portions. The tube is folded back in reverse with the second portion of the tube disposed in the third portion of the tube.

Preferably, the third portion is disposed in proportion to the second portion along the tube and the inverse fold is disposed between the second and third portions.

Basic fibrous members can include flexible elastic metal wires, and interwoven fibrous members include other types of materials, such as temperature resistant materials such as silica, glass, and quartz. Preferably, the fibrous members are intertwined with one another by knitting.

Various embodiments are provided by way of example only, and actual embodiments may have fewer layers or more layers.

The present invention relates to a method of forming a sleeve having a plurality of layers. This method,

(A) selecting the first fibrous members and selecting a first technique for weaving the first fibrous members together;

(B) selecting first parameters associated with a first technique for intertwining the first fibrous members;

(C) intertwining the first fibrous members using the selected first technique and first parameters to form a first flexible tubular segment with oppositely disposed ends;

(D) selecting second fibrous members;

(E) selecting a second technique for weaving the second fibrous members;

(F) selecting second parameters related to a second technique for intertwining the first fibrous members;

(G) entangle the second fibrous members using the selected second technique and second parameters to form the second flexible tubular segment, wherein the second fibrous members are at one end of the first flexible tubular segment Entangle the second fibrous members continuously intertwined with the first segment members to form a second flexible tubular segment from the second; And

(H) coaxially drawing the second tubular segment in the first tubular segment.

Preferably, the first and second tubular segments are formed by knitting and the segments are integrally joined by woven the second segment with fibrous members of the first segment at one ends of the tubes.

It is an object of the present invention to provide a sleeve for receiving elongated items.

Another object of the present invention is to provide a sleeve having multiple layers arranged adjacent to each other.

It is a further object of the present invention to provide a sleeve which can be knitted with other materials in a continuous process.

Another object of the present invention is to provide a sleeve in which the various layers have different characteristics.

These and other objects and advantages of the present invention will become apparent upon consideration of the following detailed description with reference to the drawings.

1 is a side view of a sleeve according to the invention shown prior to forming the sleeve in a multi-layer form;

FIG. 2 is a longitudinal sectional view of the sleeve shown in FIG. 1, showing a sleeve after forming the sleeve in a multi-layered form; FIG.

3 is a cross-sectional view taken along line 3-3 of FIG.

4 is a side view of the sleeve according to the invention shown prior to forming the sleeve in a multi-layer form;

FIG. 5 is a longitudinal sectional view of the sleeve shown in FIG. 4, showing the sleeve after forming the sleeve in a multilayer manner; FIG.

6 is a side view of the sleeve according to the invention shown before forming the sleeve in a multilayer manner;

FIG. 7 is a longitudinal sectional view of the sleeve shown in FIG. 6, showing the sleeve after forming the sleeve in a multi-layered manner. FIG.

8 is a perspective view of a multilayer sleeve formed in accordance with the present invention.

9 is a sectional view taken along line 9-9 of FIG.

10 is a longitudinal sectional view of the sleeve taken along line 10-10 of FIG.

FIG. 11 is a perspective view of the multi-section sleeve shown prior to forming the sleeve in a multilayer manner. FIG.

1 and 2 show a sleeve 10 according to the invention. The sleeve 10 comprises a first flexible tubular segment 12 having opposing ends 14, 16, which segment 12 is formed of intertwined fibrous members 18. The fibrous members 18 are entangled with one another by knitting to provide soluble and elasticity to the sleeve 10 such that the sleeves approximate the shape and path of the elongated substrate. Fibrous members 18 include a type of material, an intertwining style, such as a particular form of knit or weaving or a specific density of knit or weaving, and also includes strength, abrasion resistance, heat conduction resistance, flammability, and vibration damping ability. It has any features that may include certain features. These features are selected in relation to the specific circumstances and functions that caused the sleeve to be performed as described below.

The sleeve 10 consists of an intertwined fibrous member 26, such as a knit, having opposing ends 22, 24, wherein the fibrous members 18 have a second flexible tubular segment 20 with other features. ). The end 22 of the segment 20 is attached to the end 16 of the segment 12, the segment having fibrous members 18, 26 to form an almost continuous sleeve in an almost continuous process described below. ) Is preferably integrated integrally. Preferably, the free ends 14, 24 of the segments 12, 20 are finished with the welts 28, 30 to prevent loosening of the segments and to provide a finished shape. Welts are used to secure an elongate substrate disposed within the sleeve 10 to maintain the position of the sleeve on the substrate.

1 shows the sleeve 10 as knit before being formed into a multilayer structure. The sleeve 10 is completed as shown in FIG. 2 by bending one of the segments, for example segment 20, inward, thereby forming an inverse fold 32 as well as forming a first segment 12 in the first segment 12. Segment 20 is drawn coaxially in a central space 34 defined by this. Segment 20 defines a central space 36 for receiving an extended substrate to be protected, such as an automatic exhaust gas circulation (EGR) tube. Together, the segments 12, 20 form the outer and inner adjacent layers 12a, 20a surrounding the central space 36. This also facilitates the drawing of the segment 12 in the central space 36 defined by the segment 20.

Segments 12 and 20 have approximately the same length as each other and the reverse folds 32 are folded back such that the inverse folds 32 are disposed between the segments and ends 24 and 14 and adjacent to each other. However, the segments 12, 20 need not have the same length, the inverse folds 32 need not be disposed between the segments, and the ends 24, 14 may all of the parameters vary and the particular application There is no need to adjoin because it can be adjusted as needed.

As mentioned above, the fibrous members 18, 26 have other features selected for the particular properties appropriate for the sleeve 10 in response to the environment and / or function to which the sleeve will depend. For example, if the sleeve insulates the EGR tube, it is desirable to knit the inner segment 20 from high temperature resistant fiber members such as glass, quartz or other mineral fibers. High temperature resistance is necessary because the inner segment 20 can contact an EGR tube that can reach temperatures in excess of 1000 ° F. However, glass fibers are the main surface stimulus when adjusted during installation. To prevent stimulation, the outer segment 12 is knitted with DREF yarns with a glass fiber core and a coating of non-irritating fibers such as para-aramid. Oxidized polyacrylonitrile fibers having high temperature resistance but non-irritating can be used to knit other segments 12. Although it is possible to fully knit the sleeve with DREF yarns, the glass fibers are stimulated with respect to the inner segment 20 using expensive DREF or oxidized polyacrylonitrile fibers only on the outer segment 12 where non-irritating characteristics are needed. It is more economical to do so or to reduce costs. Welt on the inner segment 20 with the same material used for the outer segment 2 so that the technician installing the sleeve is not in contact with the irritating fibrous members 26 including the inner segment 20. It is advantageous to form 30.

High temperature applications may require increasing the insulating properties of the sleeve 10. This can be easily accomplished by using a rib knit to form integral ribs longitudinally along the sleeve. As shown in the cross-sectional view of FIG. 3, the ribs 35 serve as spaces to form air pockets 38 between the tubes 12, 20 and to reduce heat transfer by reducing contact between the segments. It may extend outwardly from the inner segment 20 and / or inwardly from the outer segment 12. The additional ribs 35 may extend outwardly from the outer segment 12 and / or inwardly from the inner segment 20. These ribs provide air pockets 8 between the inner segment 20 and the item or act as a bumper, such as an EGR tube that the sleeve encloses, thereby preventing direct contact with the outer segment 12. Bumpers are useful to prevent wear of the outer segment 12 and to absorb shocks.

4 and 5 show another embodiment of the present invention comprising a sleeve 40 formed of three flexible tubular segments 42, 44, 46. Preferably, the segments are integrally joined end-to-end, ie segments 42, 44, 46 are each formed from fibrous members 48, 50, 52, preferably knitted to form a nearly continuous sleeve. Are intertwined with each other. In order to construct the sleeve 40 in the final form shown in FIG. 5, the reverse folds 54, 56 are formed in either or both end segments 42, 46 or end in the intermediate segment 44. The segments 42, 46 are formed in the intermediate segment 44 by folding them inwards. Segments 42, 46 are drawn coaxially within segment 44, thereby forming a sleeve 40 with multiple layers 42a, 44a, 46a that enclose and define a central space 55. As with the sleeve embodiment shown in FIGS. 1 and 2, one or both of the inner segments 42, 46 have features different from those of the outer segment 44. The sleeve 40 is a weltless design with free ends of the tubes 42, 46 that are finished by the sewing process to prevent loosening. However, welts can be used. Segments 42 and 46 are only half while segment 44 and other lengths are viable. In alternative embodiments, segments 42 and 46 may be drawn on the outside of tube 44 to form multilayer sleeve 40.

6 and 7 show another embodiment of the present invention in which the sleeve 58 is formed of three flexible tubular segments 60, 62, 64. The segments are integrally joined end-to-end with the free ends of the segments 60, 64 finishing with the walts 66, 68 for the reasons described below. As shown in FIG. 7, the sleeve 58 is constructed by forming two inverse folds 70, 72, with segments 62 being drawn within segment 60 and segments 64 being segmented. It is drawn to form a sleeve with three adjacent layers 60a, 62a, 64a which are drawn within 62 to surround the central space 73.

The fibrous members 74, 76, 78 that form the segments 60, 62, 64, respectively, are woven together by a knitted fabric. One or more of the fibrous members may have other features selected for specific properties such as heat resistance, abrasion resistance and damage resistance as mentioned above. Welts 66, 68 are disposed in opposite cross-sections of sleeve 58 and operate as elastic cinch to secure the sleeve to the item received in central space 73.

The production of sleeves according to the invention is advantageously achieved between circular knitting machines with multiple feeders which can adjust different multifiber members and knit different stitch types and different stitch densities. In one embodiment, the material properties of the segments are different and the first segment is knitted using a fibrous member composed of a first material held on a first feeder of the machine. When the first segment is completed, the second feeder performs an operation of introducing a second fibrous member of another material into the needle. The first feeder interacts with the needles, the first fibrous member is cut, and the knit is made with the second fibrous member on the second feeder. This process can be repeated as many times as needed depending on the number of segments required (corresponding to the number of layers in the sleeve). The fibrous members may be reintroduced into the knitting process once the action is taken when the welt is knitted with the first material on the end of the segment composed of the second material as described above with reference to FIGS. 1 and 2. Other features, including parameters such as knit density or knit type, can be changed in addition to or instead of the material type during the knitting process by controlling the operation of the needles and hooks. This is done by knitting certain processes of a particular stitch or knit density and then programming the machines to perform different numbers of processes with different stitch types and / or densities.

8-11 describe another sleeve embodiment 80 according to the present invention. As shown in FIG. 11, the sleeve preferably includes an elongated flexible continuous tube 82 formed of fibrous members 84 interwoven with a knit fabric. The fibrous members 84 for the first portion 86 of the tube 82 are interwoven together with the first fibrous members 88 having different characteristics from the basic fibrous members 84. The fibrous members 84 for the second portion 90 of the tube 82 are interwoven with each other with the second fibrous member 92 the same as the first fibrous member or with another second fibrous member 92. Fibrous members 984 for the third portion 94 of the tube 82 are third fibrous members 96, which may be the same as or different from the first and second fibrous members 88, 92. Intertwined with each other. Preferably, the various portions 86, 90, 94 defined by the intertwined fibrous members 88, 92, 96, respectively, are spaced apart along the tube 82 and comprise a basic fibrous member comprising the tube. The fields 84 are separated from one another by an area 980 which is barely exposed. The portions 86, 90, 94 may have approximately the same length as each other but may have different lengths. Three parts are chosen for illustration but it should be understood that more or less parts may exist depending on the requirements driving the design.

As shown in FIG. 10, the sleeve 80 according to the present invention has a first portion to form multiple adjacent layers 94a, 90a, 86a which enclose and define the central space 100 as shown in FIG. 9. It is formed by folding back the portions described in FIG. 11 to draw the second portion 0 in 86 and draw the third portion 94 in the second portion 90. Preferably, as shown in FIG. 10, the reverse folds 102, 104 coincide with the separation regions 98 upon completion of the sleeve 80. Positioning the reverse poles in the separation regions prevents the deformation of the brittle fibers, which may include fibrous portions intertwined with the tube 82 to define the portions forming adjacent layers. The separation regions are smaller than the portions 86, 90, 94 but tend to be more flexible, thus facilitating the formation of inverse folds and not increasing the diameter of the sleeve 80. The separation region 98 at the free end of the tube 82 may be rolled back to form the final ends 106 for the sleeve 80.

In a particular example of a sleeve 80 to insulate a tubular heating source 108, such as an automotive EGR tube, the tube 82 is a basic fiber comprising stainless steel, and a full-hard wire having a diameter of about 0.04 inches. Knitted into shape members 84. The innermost portion 94 of the sleeve 80 includes high temperature elastic ceramic yarn, such as 1600 denier elastic yarn, which weaves together with the elastic base wire 84. The central portion 90 is a multifilament glass fiber yarn, such as an E-glass yarn of 200-6000 denier, although in some applications where typical high temperatures occur, silica yarn or other ceramic yarn may be used independently of or in combination with glass fibers. Is woven together with the base wire 84 to form a fit. In the exemplary sleeve 80 with three layers, the outermost portion 86 consists of 200-6000 denier E-glass that is interwoven with a wire 84 that includes a tube 82.

A typical silica thread is 1600 data multifilament tissue yarn manufactured by BelChem of Ebisdorf, Germany under the trade name belCoTex. Other ceramic yarns that may be used are K-type silica yarns sold in the United States under the trade name Siltex. The yarns of the portion 90 forming the intermediate layer 90a may be mixed yarns of ceramic and glass fibers, and are preferably organized so that the insulation quality is improved because they are of the highest quality or large capacity.

Referring to FIG. 11, the sleeve is made in a continuous process as a single elongated flexible tube 82. Although the tube 82 with the interwoven portions 86, 90, 94 can be formed by weaving or weaving, the auxiliary knitting machine is used in carrying out the preferred manufacturing method. Auxiliary knitting machines are manufactured by Tritex International Limited of the UK racer. Such a machine is a circular weft knitting machine, model TX900, which can knit tubular fabrics having a diameter of about 0.875 to 1.75 using different types of yarn in different tubular sections. The auxiliary knitting machine has a separate grouping of needles that selectively pick up another group of yarns for knitting tubular articles using yarns with other features at longitudinally spaced locations along the article.

Once the tube 82 is knitted with the portions 86, 90, 94, the tube 82 is placed in the pit to form in the multilayer sleeve 80. This is achieved by folding back the first and second portions 86, 90 on the third portion 94 until the second portion 90 completely covers the third portion. Then, the first part is released again on the second and third parts 90, 94. Then, at the free ends of the first and third portions 86, 94, the end region 98 again rolls as shown in FIGS. 1 and 10 to provide the final ends 106 for the sleeve. To be fixed. The described sleeve 80 can be made simple and has been found to efficiently insulate EGR tubes with surface temperatures higher than about 1800 ° F. The structure can have a proper weight and size. The stainless steel wire forming the tube 82 efficiently dissipates heat along the length of the sleeve 80, thereby eliminating the heating spots, thereby preventing deterioration of the insulation seals. Because the sleeve is a continuous tubular member that is folded back several times to form multiple layers, end frying and splitting of the layers are prevented. In addition, the isolation regions 98 exclusively formed of knitted wire use as attachment collars or grommet for attaching the sleeve ends to the ends of the insulated item.

The flexible multilayer sleeve according to the present invention provides a lightweight or inexpensive sleeve for receiving extension items. The sleeve can be adapted to any geometry and can also adapt to extreme heating, cooling, vibration and shock environments in protecting and / or insulating extension items using substantially any type of fibrous members. There is flexibility in.

Claims (50)

A sleeve for receiving an extension item, A first flexible tubular segment comprising a first fibrous member entangled together with opposite ends; A second flexible tubular segment comprising a second fibrous member entangled together with opposite ends; And A plurality of ribs formed longitudinally along the second tubular segment; Wherein the second fibrous member is different from the first fibrous member, and one end of the first tubular segment is coupled to one end of the second tubular segment, the inner and outer adjoining surrounding a central space; The second segment is bent inversely and coaxially drawn in the first tubular segment to form a layer, the inverse fold forming one cross section of the sleeve, The ribs face outwardly from the central space to engage the first tubular segment, separate the layers and form a plurality of air pockets therebetween, Wherein said fibrous member is intertwined by a knit, said second tubular segment comprising a rib-knit stitch, said rib being formed completely within said second tubular segment. The sleeve of claim 1 wherein the segments are integrally coupled to each other. The sleeve of claim 1 wherein said inverse fold is disposed between said segments. 4. The sleeve of claim 3 wherein the first and second tubular segments have the same length and the other ends of the first and second tubular segments are disposed adjacent to each other and form another cross section of the sleeve. 2. The sleeve of claim 1 wherein the other ends of the first and second tubular segments are welded. delete delete A sleeve for receiving an extension item, A first flexible tubular segment comprising a first fibrous member entangled together with opposite ends; A second flexible tubular segment comprising a second fibrous member entangled together with opposite ends; And A plurality of ribs formed longitudinally along the first tubular segment; Wherein the second fibrous member is different from the first fibrous member, and one end of the first tubular segment is coupled to one end of the second tubular segment, the inner and outer adjoining surrounding a central space; The second segment is bent inversely and coaxially drawn in the first tubular segment to form a layer, the inverse fold forming one cross section of the sleeve, The ribs face inwardly from the central space to engage the second tubular segment, separate the layers and form a plurality of air pockets therebetween, Wherein said fibrous member is intertwined by a knit, said second tubular segment comprising a rib-knit stitch, said rib being formed completely within said second tubular segment. delete 2. A sleeve according to claim 1, wherein the fibrous members are entangled with one another by knitting. 2. The apparatus of claim 1, further comprising a third tubular segment having opposing ends and comprising intertwined fibrous members, wherein one end of the third tubular segment is coupled to the other end of the first tubular segment. And the third tubular segment is drawn coaxially within the first tubular segment to form an inner and outer adjacent layer surrounding a central space, and the other reverse fold forms the other end of the sleeve. . 12. The sleeve of claim 11, wherein the other end of the third segment is disposed proximate to the other end of the second tubular segment. 13. The sleeve of claim 12 wherein the second and third tubular segments are one half of the length of the first tubular segment. 14. The sleeve of claim 13 wherein said inverse fold is disposed between said segments. 2. The apparatus of claim 1, further comprising a third tubular segment having opposing ends and comprising intertwined fibrous members, wherein one end of the third tubular segment is coupled to the other end of the first tubular segment. Wherein the third tubular segment is drawn coaxially on the first tubular segment to form another outer layer surrounding the inner and outer adjacent layers, and the other reverse fold forms the other end of the sleeve. Sleeve. 16. The sleeve of claim 15 wherein said inverse fold is disposed between said segments. 17. The sleeve of claim 16 wherein said first, second and third tubular segments have the same length. 2. A sleeve according to claim 1, wherein said second fibrous member is a thermoelastic mineral fiber. 19. The sleeve of claim 18, wherein the mineral fiber is selected from the group comprising glass, quartz, silica and ceramic fibers. 19. The sleeve of claim 18, wherein said first fibrous member is selected from the group consisting of DREF yarns and oxidized polyacrylonitrile fibers. 21. The sleeve of claim 20 wherein the DREF yarn comprises a glass core surrounded by para-aramid fibers. 2. The sleeve of claim 1 wherein said first and second tubular segments are knitted and said first tubular segments have a different fabric than said second tubular segment. 23. The sleeve of claim 22 wherein the first tubular segment is knitted to a higher knit density than the second tubular segment to provide wear resistance to the outer adjacent layer. A sleeve for receiving an extension item, A first flexible tubular segment comprising a first fibrous member entangled together with opposite ends; A second flexible tubular segment comprising a second fibrous member entangled together with opposite ends; And A plurality of ribs formed longitudinally along the second tubular segment; Wherein one end of the first tubular segment is coupled to one end of the second tubular segment and the second segment is configured to form an inner and outer adjacent layer surrounding a central space. Drawn coaxially within, the inverse fold forms one section of the sleeve, The ribs face outwardly from the central space to engage the first tubular segment, separate the layers and form a plurality of air pockets therebetween, Wherein said fibrous member is intertwined by a knit, said second tubular segment comprising a rib-knit stitch, said rib being formed completely within said second tubular segment. 25. The sleeve of claim 24 wherein said first tubular segment is comprised of a first fibrous member and said second tubular segment is comprised of a second fibrous member different from said first fibrous member. 25. The sleeve of claim 24 wherein the first and second tubular segments have the same length and the other ends of the first and second tubular segments are disposed adjacent to each other and form the other end of the sleeve. delete delete A sleeve for receiving an extension item, A first flexible tubular segment comprising a first fibrous member entangled together with opposite ends; A second flexible tubular segment comprising a second fibrous member entangled together with opposite ends; And A plurality of ribs formed longitudinally along the first tubular segment; Wherein one end of the first tubular segment is coupled to one end of the second tubular segment and the second segment is configured to form an inner and outer adjacent layer surrounding a central space. Drawn coaxially within, the inverse fold forms one section of the sleeve, The ribs face inwardly toward the central space to engage the second tubular segment, separating the layers and forming a plurality of air pockets therebetween, Wherein said fibrous member is intertwined by a knit, said second tubular segment comprising a rib-knit stitch, said rib being formed completely within said second tubular segment. delete 25. The device of claim 24, further comprising a third tubular segment having opposing ends and comprising intertwined fibrous members, wherein one end of the third tubular segment is coupled to the other end of the first tubular segment. And the third tubular segment is drawn coaxially within the first tubular segment to form an inner and outer adjacent layer surrounding a central space, and another inverse fold is formed to form the other end of the sleeve. Sleeve. 32. The sleeve of claim 31 wherein said fibrous member comprising said first and third tubular segments is comprised of a material different from said fibrous member comprising said first tubular segment. 33. The sleeve of claim 32, wherein the second and third tubular segments are made of the same material. 25. The device of claim 24, further comprising a third tubular segment having opposing ends and comprising intertwined fibrous members, wherein one end of the third tubular segment is coupled to the other end of the first tubular segment. And the third tubular segment is drawn coaxially on the first tubular segment to form another outer layer surrounding the inner and outer adjacent layers, and another inverse fold is formed to form the other end of the sleeve. Sleeve made. A sleeve for receiving an extension item, An elongate flexible continuous tube comprising a plurality of basic fibrous members entangled together; A first tubular segment of the tube having a plurality of first fibrous members entangled with the basic fibrous member; A second tubular segment of the tube having a plurality of second fibrous members intertwined with the basic fibrous member; And A third tubular segment of the tube having a plurality of third fibrous members intertwined with the basic fibrous member; Wherein the tube is folded back with the first tubular segment of the tube disposed within the second tubular segment of the tube,  The second tubular segment is disposed between the first and third tubular segments, the tube is folded back with the second tubular segment of the tube disposed within the third tubular segment of the tube, The first, second and third tubular segments have the same length, The sleeve further comprises a plurality of ribs each formed longitudinally along the first, second and third tubular segments; The rib of the first tubular segment faces inwardly toward the central space and engages with the second tubular segment, the rib of the second tubular segment engaging one portion with the first tubular segment and the other part of the rib. Meshes with the three tubular segments, the ribs of the third tubular segments facing outward from the central space and facing the second tubular segment, The ribs separate the layers and form a plurality of air pockets therebetween, the fibrous members are entangled with each other by knitting, and the first, second and third tubular segments have at least one rib in an adjacent portion. A sleeve formed by knitting stitches. 36. The sleeve of claim 35, wherein the first tubular segment is disposed spaced apart from the second tubular segment along the tube. 37. The sleeve of claim 36, wherein a reverse fold is disposed between said first and second tubular segments. delete 36. The sleeve of claim 35, wherein the third tubular segment is disposed spaced apart from the second tubular segment along the tube. 40. The sleeve of claim 39 wherein an inverse fold is disposed between said second and third tubular segments. 36. The sleeve of claim 35, wherein said basic fibrous member comprises a flexible elastic metal wire. 36. The sleeve of claim 35, wherein said first fibrous member comprises a temperature resistant metal selected from the group consisting of silica, glass and quartz. 36. The sleeve of claim 35, wherein the fibrous members are entangled with one another by knitting. A sleeve for receiving an extension item, An extension continuous tube redistributed into a plurality of tubular segments completely joined end to end with respect to each other, wherein one segment of the tubular segments consists of a first fibrous member intertwined with one another to form a plurality of ribs , The other of said tubular segments consists of a second fibrous member intertwined with each other to form a plurality of ribs completely, said one tubular segment forming a plurality of adjacent adjacent layers surrounding a central space for receiving said item. Drawn coaxially within another tubular segment, Wherein said rib separates the layers and forms a plurality of air pockets therebetween. 45. The sleeve of claim 44, wherein said first fibrous member is comprised of a first material and said second fibrous member is comprised of a second material different from said first material. 45. The method of claim 44, wherein the first fibrous member is comprised of a first material having a first set of properties, and the second fibrous member is comprised of a second material having properties different from that of the first material. A sleeve, characterized in that. 46. The sleeve of claim 45, wherein the first and second fibrous members are intertwined by a knit fabric. 48. The method of claim 47, wherein the first fibrous member is knitted using the first knitted parameter and the second fibrous member is knitted using a second knitted parameter different from the first knitted parameter. Sleeve. 49. The sleeve of claim 48, wherein the first and second knit parameters are knit stitch densities. A method for forming a sleeve for receiving an extension item, the method comprising: Selecting a first fibrous member; Forming a first tubular segment with the rib, the first tubular segment having opposingly disposed ends formed by entangled the first fibrous member using a knit having a first knit density; Selecting a second fibrous member; Forming a second tubular segment completely with the rib, the second tubular segment having opposingly disposed ends formed by intertwining a second fibrous member using a knit having a second knit density, the second tubular segment being the first tubular; The second fibrous member is continuously intertwined with the first fibrous member to form continuously from one end of the segment, and at least one of the portions of the first and second tubular segments is by rib-knit stitching. Formed; And Coaxially drawing the second tubular segment within the first tubular segment; Wherein said ribs separate the layers and form a plurality of air pockets therebetween.

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