FR2838800A1 - Production of stuffing-box packing from a material comprising fibers laminated to a sheet of expanded graphite with an adhesive - Google Patents

Abstract

Production of stuffing-box packing comprises laminating a bundle of fibers (7) to a sheet of expanded graphite (6) with an adhesive (8), cutting the laminate into strips, rolling or twisting the strips to form a yarn, braiding the yarn to form a cord, and shaping the cord under pressure.

Description

less by area a honeycomb structure.

  The present invention relates to materials used in a stuffing box packing made of expanded graphite, to the stuffing box packing made of expanded graphite made from materials, and to a method of making packing stuffing box made in expanded graphite, and more particularly, it relates to stuffing box packing materials with ease of production in addition to sealing capacity, heat resistance, chemical resistance and other properties and without causing stress reliever, made of expanded graphite, to the stuffing box packing made of expanded graphite made from materials and to the method of making stuffing box packing made of

expanded graphite.

  In the description, << twist a leaf

  strip laminate >> means a movement of transformation of a strip laminate sheet into a cylinder with two parts of a strip laminate sheet which separate during axial rotation in opposite directions to each other. In such a case, the cylindrical twist so that the adhesion covers an alignment of wire, and the cylindrical twist (a circular cylinder substantially without hollow part is preferable) so that it does not cover a

  wind wire alignment both possible.

  In the description, << roll up a sheet

  strip laminate >> means a movement for transforming a sheet laminated into a strip into a cylinder with a sheet laminated into a strip wound in a spiral around an axis. In this case, the cylindrical twist so that the adhesion covers a line of wire, and the cylindrical twist (a circular cylinder substantially without hollow part is preferable) so that it does not cover a line of wire

all available.

  In the description, "pulling force

  possible >> means the product of the tensile strength of the materials (N / cm2) and the section of materials (cm2) in the case of materials resulting in a fracture. As a seal which achieves a shaft seal in a fluid apparatus, there has hitherto been a gland packing manufactured in expanded graphite. The stuffing box packing made of expanded graphite is placed in a housing which is formed between a shaft and an apparatus bolt, that is to say inside the trim bolt, in order to prevent the

  passage of fluid between the shaft and the device housing.

  Compared to a packing material such as asbestos, expanded graphite surpasses it because it hardly causes relaxation of stress, in lubrication capacity, in heat resistance, in chemical resistance and in other properties, but on the other hand, it has the defect that its tensile strength is low and it is also fragile. Thus, during the construction of an expanded graphite sheet and the twisting treatment of this sheet, there are circumstances where said sheet fractures from the falt of a large tensile force which reacts on it. For these reasons, there have been few circumstances where a stuffing box packing made of expanded graphite is made from the expanded graphite itself, and it is usually

  made by reinforcing it with other materials.

  As stuffing box packing made of expanded graphite which has a reinforced structure, the following

has been suggested.

  For example, a gland packing made of expanded graphite in which a laminated sheet is formed by laminating a canvas sheet of cotton thread on a surface of expanded graphite sheet) a laminated sheet is formed by cutting this sheet stratified; a braiding wire is formed by a process of twisting this laminated sheet so that the strip laminated sheet covers a reinforcing wire and the expanded graphite sheet is positioned outside, and after that, this wire has braiding is braided into a stuffing box packing made from a graphite sheet

expanded, is suggested.

  In this example, during the torsion treatment of the laminated sheet and the braiding of the braiding wire, a tensile force reacts on the expanded graphite sheet. However, the expanded graphite does not fracture, because it is reinforced with the wire cloth sheet

cotton.

  However, in the prior art as mentioned

  above, there are some problems as follows.

  That is to say that the tensile force of the cotton thread is not very high, and in order for the canvas sheet of cotton thread to function sufficiently as a reinforcing material, it is necessary to have the section of said sheet which is larger. In order to correspond to this need, the width of the sheet of cotton thread canvas has been enlarged by winding the width of the laminated sheet in strips, in particular, the width has been chosen greater than 10 mm. However, it is difficult to obtain a good quality braiding thread. This is due to the flexibility of the laminated sheet which becomes narrower when the width of the latter becomes greater than mm, causing difficulty in the processing of torsion. Likewise, the braiding thread obtained in this way is inferior in terms of flexibility, which

  causes difficulty when braiding it.

  In addition, the hot loss of the cotton yarn in hot circumstances is significant. Thus, stress relaxation in a hot circumstance is important, and it is difficult to safeguard the capacity of the gland packing itself unless tightening occurs when the cotton wire fabric is

  used as stuffing box packing.

  In addition, the stuffing box packing made from expanded graphite which was obtained by braiding with this braiding wire is also inferior in terms of flexibility. If this stuffing box packing made of expanded graphite with reduced flexibility is housed in the packing box, it is not possible to ensure a sufficient sealing capacity, even if the

cable gland is tight.

  Figure 1 is a perspective view showing a first example of a braiding wire of the first form

  of realization of the present invention.

  Figure 2 is a view showing a process of

  manufacture of the braiding wire represented in FIG. 1.

  Figure 3 is a sectional view showing a laminated sheet which is used to produce a wire

  braid shown in Figure 1.

  Figure 4 is a perspective view of a cord body which is constructed from the braiding wire

shown in Figure 1.

  Figure 5 is a perspective view showing a packing gland made from expanded graphite which is constructed from the braiding wire

shown in Figure 1.

  FIG. 6 is a view showing a bundle of fibers after cutting; (a) is a view of an example showing the width cut of a bundle of fibers with each fiber which extends in a straight line (b) is a view of an example showing the width cut of a bundle of fibers with each fiber that curls in a wavy manner. Figure 7 is a perspective view showing the previous example of the first embodiment of the

  braiding thread according to the present invention.

  Figure 8 is a perspective view showing the second example of the first embodiment of the

  braiding thread according to the present invention.

  Figure 9 is a view showing a process of

  manufacture of the braiding wire represented in FIG. 8.

  Figure 10 is a perspective view showing the third example of the first embodiment of the

  braiding yarn of the present invention.

  Figure 11 is a perspective view showing

an example of reinforcing wire.

  Figure 12 is a perspective view showing

an example of a reinforcing wire.

  Figure 13 is a perspective view showing

an example of a reinforcing wire.

  Figure 14 is a perspective view showing

an example of a reinforcing wire.

  Figure 15 is a perspective view showing

an example of a reinforcing wire.

  Figure 16 is a sectional view showing a wire

  braid shown in Figure 10.

  Figure 17 is a perspective view showing a manufacturing process of the second form of

  realization of the present invention.

  Figure 18 is a perspective view showing a manufacturing process of the third form of

  realization according to the present invention.

  Figure 19 is a sectional view showing a strip laminated sheet which is used in the case of the construction of a braiding wire shown in Figure 18. Figure 20 is a view showing the size of the

  laminated sheet which is used in the tensile test.

  Figure 21 is a view showing the situation of

the torque test.

  The stuffing box packing made of expanded graphite according to the present invention and the materials used in this packing will be

  explained with reference to the drawings.

  Figure 1 is a perspective view showing a first example of a braiding wire of the first embodiment of the present invention. Figure 2 is a view showing a process for manufacturing the braiding wire shown in Figure 1. Figure 3 is a sectional view showing a laminated sheet which is used to construct the braiding wire shown in Figure 1. Figure 4 is a perspective view of a cord body which is constructed from the braiding wire shown in Figure 1. Figure 5 is a perspective view showing a stuffing box packing made of expanded graphite which is constructed from the

  cord body shown in Figure 4.

  The stuffing box packing 1 made in

  expanded graphite according to the present invention (hereinafter called

  after trim) can be obtained by forming under pressure a cord body 3 which is formed by braiding a wire

braid 2.

  These structural elements will be explained in

detail gradually below.

  The braiding wire 2 is formed by winding a laminated sheet in strip 4 and transforming it into filament or by twisting a laminated sheet in strip 4 and transforming it into filament. FIG. 2 shows the appearance of the sheet laminated in strip 4 when it is twisted. The laminated sheet in strip 4 is formed by cutting the laminated sheet 5 shown in Figure 3 in strips. The laminated sheet 5 is constituted by the expanded graphite sheet 6 which is laminated and bonded to the bundle of carbon fibers in a strip (hereinafter called fiber bundle) 7 by means of an adhesive layer 8. The adhesive layer 8 fills both the role of reinforcing material and the

role of adhesive itself.

  The type of adhesive layer 8 is not particularly limited and it can be constituted by an organic adhesive, a mineral adhesive and a mixture of organic and mineral adhesive and, as regards the form, it can be in liquid form, in emulsion , in film, in non-woven canvas and so on. In addition, the way of using it is not particularly limited, one can choose the application, the bonding by

  thermocompression, spraying and so on.

  It is desirable to use a water-soluble thermal plastic adhesive, and it is even more desirable to use a non-polluting polyvinyl alcohol for the adhesive layer 8. It is possible to use polyvinyl alcohol by applying the expanded graphite sheet surface 6 or the fiber bundle 7 while keeping the polyvinyl alcohol liquid and it is also possible to use the projection. In the case of the application of polyvinyl alcohol by spraying, by

  example, it is possible to use the non woven fabric.

  In the case of the application of a nonwoven fabric on polyvinyl alcohol (called PVA below), the adhesive layer 8 is laminated by the condition of the PVA resin fibers which stretch in an irregular direction, and these PVA resin fibers turn into sheets by attaching to each other. The adhesive layer 8 with such a structure has a high tensile strength against the tensile forces in any direction, and especially in a condition where the layer is treated in order to be transformed into strips, it has high tensile strength against tensile forces in one direction

axial.

  Additionally, in the case of bonding an expanded graphite sheet 6 and a bundle of fibers 7, they can be laminated and bonded by stressing the two sides of the expanded graphite sheet 6 and the bundle of fibers 7 by laminating the adhesive layer 8 such as the PVA layer between the sheet

  of expanded graphite 6 and the fiber bundle 7.

  As expanded graphite sheet 6, after manufacture of an intermediate compound by reacting graphite powder, such as natural graphite and primary graphite, with concentrated sulfuric acid, concentrated nitric acid and so on. thereafter, the residue of the compound is recovered by soaking in water and is expanded by rapid heating, so that expanded graphite can be obtained, and flexible expanded graphite is compression molded with a rolling material so as to be shaped into a sheet for use. The concentration of the expanded graphite sheet 6 is not particularly limited, but it is preferable that it be from 0.8 to 2.2 g / cm 3. When the concentration is within this range, an irregularity in the crystal level is formed on the surface of the expanded graphite sheet 6, which causes an anchoring effect on the laminate material thereon. To speak in a comparative way, when the concentration is below 0.80 g / cm3, the organizational texture becomes too rough, which leads to a lowering of the

  sealing capacity of a gasket which is manufactured.

  On the other hand, when the concentration is greater than 2.2 g / cm3, there is a possibility that the organizational texture becomes too fine to cause an anchoring effect, and does not stratify satisfactorily.

with a bundle of fibers 7.

  Furthermore, the thickness of the expanded graphite sheet 6 is not particularly limited, but

  it is preferable that it is about 0.10 to 1.5 mm.

  When the thickness is below 0.10 mm, the remarkable thermal resistance, corrosion resistance, and abrasion resistance of the expanded graphite cannot be demonstrated. Likewise, such a thin expanded graphite sheet 6 is not economical because of the manufacturing difficulty. Whereas, when the thickness of the expanded graphite sheet 6 exceeds 1.5 mm, the

  friability of expanded graphite appears.

  The fiber bundle 7 fulfills roles both of reinforcement of the expanded graphite sheet 6 and of solid lubricating material. The fiber bundle 7 is laminated to an expanded graphite sheet surface 6 through the adhesive layer 8.

  adopt the stratification process which is mentioned above

  above, however, in the case of the use of a hot anastomosis film as an adhesive, it is possible, for example, to use a non-woven PVA fabric, a PVA film, a polyethylene film, an olefin film and a urethane film. The fiber bundle 7 is remarkable in terms of mechanical resistance, and hardly changes in property such that the mechanical resistance between -200 C and +600 C, so that it is also remarkable in terms of a characteristic to low temperature and high temperature characteristic. Consequently, the bundle of fibers 7 can surely be a reinforced expanded graphite sheet 6 in the case of a difficult temperature as well as an ordinary temperature. In addition, the fiber bundle 7 has a remarkable lubrication and sealing capacity; one can obtain the lining 1 which has a remarkable lubrication and sealing capacity by constructing the braiding wire where the bundle of fibers 7 is positioned outside the lining 1. Furthermore, since the bundle of fibers 7 is remarkable in terms of corrosion resistance and abrasion resistance, it can be resistant in long-term use even in a harsh environment, such as a chemical plant. It is sonhaitable that the thickness of the bundle of open fibers 7 is between 0.05 and 0.5 mm, and more preferably still between 0.15 and 0.2 mm. The reason is that, when the thickness is below 0.05 mm, it is impossible to obtain sufficient lubrication and sealing capacity, on the contrary, when the thickness is greater than 0.5 mm, it is impossible to get a

sufficient flexibility.

  The method of manufacturing the fiber bundle 7 is not particularly limited, and different manufacturing methods known to the public can be adopted) it is advisable to use the manufacturing method registered under patent number 3049225 or patent number 3064019. In the case of the use of these manufacturing methods which are registered in the official gazette for the manufacture of the fiber bundle 7, the carbon fiber multifilament is sent from a wire feeding part to a receiving part of wire while carrying out a supply control in order to cause a situation of constant overfeeding, and to ventilate the current of air towards the multifilament mentioned above in a transverse direction, and to cause this multifilament to take a form of arc in the leeward direction, and to bring this multifilament to constitute a sheet of the fiber bundle type by separating the filament which composes this multifi lament. Thanks to this manufacturing process, it is possible to obtain a bundle of very high quality sheet type fibers where each fiber is stretched in a rectilinear manner without cutting, extending regularly and parallel with

a fixed density and lint-free.

  The laminated strip sheet 4 is formed by cutting the laminated sheet 5 into strips, certain manufacturing processes cause the bundle of fibers not to spread in a straight line and to be brokered in the manner of an ounce, at the time of construction. of the laminated sheet 5. In this case, many fibers are cut when the laminated sheet 5 is cut into strips, but each fiber of the fiber bundle is arranged in a very thick and uniform manner, and this gives a high friction force between each fiber. Consequently, each fiber is strongly bonded in the axial direction and at a right angle, and a sheet laminated in strip 4 is obtained which has a high tensile force. Usually, the bundle of fibers 7 is thickly arranged with several types of fibers which fall in the same direction, in other words, discontinuity fibers are continuously thickly disposed in the axial direction and at right angles. . As mentioned above, in this aggregate of fibers, each fiber is bound by a large friction force to the other, and even if it is cut in an inclined manner, it is possible to make a piece of strong sheet . In the present invention, this remarkable feature of the fiber bundle 7 is used effectively. In FIG. 6 (a), an example of the bundle of fibers 7 where each fiber extends in a rectilinear manner, constituted by cutting in width, is presented, and in FIG. 6 (b), an example of the bundle of fibers 7 where each fiber extends in a wavy manner, constituted by

cut in width, is present.

  The laminated sheet 5 is formed by laminating the fiber bundle 7 and the expanded graphite sheet 6 on the adhesive layer 8. The strip laminated sheet 4 is cut from the laminated sheet 5. The width of the laminated strip sheet 4 is from 5 to 30 mm, it is preferable that it is from 5 to mm. In the case where the width is greater than 30 mm, the flexibility of a sheet laminated in strip 4 decreases

  and it becomes difficult to transform into braiding thread 2.

  On the contrary, in the case where the width is less than 5 mm, the tensile strength of tolerance decreases sharply, and there is a risk of fracture when a sheet laminated in strip 4 is transformed into braiding wire 2. In the If the width is between 5 and 30 mm, a sheet laminated in strip 4 has a sufficient tolerable tensile force, so that there is no risk in the treatment of

twist and winding.

  Since the strip laminated sheet 4 is reinforced by the fiber bundle 7 and the adhesive layer 8, it is possible to compose it relatively thin. Consequently, it is possible to ensure sufficient flexibility not only of the strip laminated sheet 4 whose width is 5 to 10 mm but also of the strip laminated sheet 4 whose width is greater than 10 mm. In the case of the composition of the braiding wire 2 using a sheet laminated in strip 4 which is 5 to 10 mm wide, it is possible to construct a cord body 3 with a large number braiding process such that a braiding process has twenty-four and thirty-two. Additionally, it is possible to compose a cord body 3 which is composed by a large number braiding process using a braiding wire of several thicknesses 2. Thanks to this, it is possible to obtain a large lining. sealing capacity 1 because it allows the interior of a

cord body 3 of stepaissir.

  The braiding thread is obtained by twisting and transformation into a thread or winding and transformation into a thread. In the winding process and the twisting process, the two processing methods or the fiber bundle 7 is positioned outside or the expanded graphite sheet 6 is positioned outside the loons, but it is desirable that the fiber bundle 7 is positioned outside. The reason is that, as far as the lubrication capacity and the sealing capacity, the fiber bundle 7 is better than the expanded graphite sheet 6. Additionally, the expanded graphite contains sulfur, so that there has a possibility of corrosion of the stuffing box when the expanded graphite touches the metal and especially the stuffing box metal, but the fiber bundle 7 does not contain sulfur, so that corrosion does not appear when the bundle of fibers 7 is positioned outside. The method of winding and twisting the sheet laminated into strip 4 in the present invention is not particularly limited, however, in the case of the winding process, for example, it is possible to choose the process which winds spiral tightly the laminated sheet in strip 4 (see FIG. 10), or the process which twists this laminated sheet in spiral strip. In the case of twisting, it is possible to choose the method which twists tightly a laminated sheet in strip 4 which is folded in the center of the

  transverse direction, or which twists without folding.

  The desirable number of twists or wraps is 55 to 70 per 1 meter. With these twist or winding numbers, the inventor has determined that the resistance of the braiding wire 2 becomes extremely high. In addition, it is preferable that the strip laminated sheet 4 is treated by twisting so that the fiber bundle 7 is positioned on the outside. In this case, as mentioned below, the fiber bundle 7 can be positioned on the surface of the lining 1. Since the fiber bundle 7 which is separated from the carbon fiber bundle which is produced from the multifilament of carbon fiber is remarkable in terms of lubrication capacity, abrasion resistance, corrosion resistance, mechanical resistance and sealing capacity, using this fiber bundle 7 as

  material, it is possible to obtain a press packing

  gland 1 having lubrication capacity, abrasion resistance, corrosion resistance,

  mechanical resistance and sealing capacity.

  Furthermore, since this braiding wire 2 is remarkably flexible, it is possible to easily carry out a complex braiding treatment, and even if a complex treatment is used, this does not cause a fracture in a laminated sheet in strip 4. Additionally, since a sheet laminated into strip 4 which constitutes the braiding yarn 2 has a sufficient tolerable tensile force, there is no risk.

during braided manufacturing.

  Finally, the braiding wire 2, as shown in Figure 8 and Figure 9, may include a structure with a reinforcing wire 9 (the second example of the first embodiment of the braiding wire). To put it in concrete terms, it can include a structure which uses a reinforcing wire 9 as a core, and the sheet laminated in strip 4 is wrapped around the reinforcing wire 9, or it can include a twisted structure which makes the laminated sheet in strip 4 as shown in FIG. 9 so that the strip laminated sheet 4 covers the reinforcing wire 9. In this case, a possible tensile force of the braiding wire 2 can be improved compared to a braiding wire. who is

  built only with a laminated sheet in strip 4.

  The material of the reinforcing wire 9 is not particularly limited, and any tail material can be used in an appropriate manner if it has a resistance necessary as material for a seal, for example metals such as Monel, Inconel, stainless steel, copper and aluminum, fiberglass, ceramic fiber, synthetic resin fiber such as aramid resin, polytetrafluoroethylene (PTFE) resin, Nylon resin, rAsine acrylic and phenolic resin, synthetic resin fibers impregnated with a lubricating oil, synthetic resin fiber carbide

and asbestos.

  It is preferable for the reinforcing wire 9 to have its diameter below 3 mm. If the diameter is of such a length, a torsion treatment of the

  laminated sheet in strip 4 can easily be produced.

  Additionally, only one piece of this reinforcing wire 9 can be used, and several pieces can also be used as described below. If a part is used, the reinforcing wire 9, for example, can be used as it is. without braiding, or else it can be used as a tent as a cord body which has been braided. In addition, if several parts are used, the reinforcing wire 9 can be used by bundling it, or by trying that body of cord which has been put in

bundle and braid 6.

  [A sectional shape of each wire rod which makes up the reinforcing wire 9 is not particularly limited, for example, it is possible to use many configurations such as an orbicular section, a rectangular section and an elliptical section and and so on.

  A body of cord 3 in the form of a knitted cord, of braided cord 4, of twisted cord and so on can be formed by braiding with this braided wire 2 which is obtained. To speak concretely, braiding with one or more pieces of the braiding thread 2, a cord body 3 in the form of a knitted cord such as a round knitted cord and a square knitted cord can be carried out #. In addition to these, a cord body 1 in the form of a double braiding cord or a tight cord can be constituted. In the case of braided cords, a

  spontaneous braiding process with four, eight, sixteen, ten-

  eight, twenty-four or thirty-two braiding threads were used. The cord body 3 has a structure such that a bundle of fibers 7 or an expanded graphite sheet 6 is positioned outside. Since a lining 1 is formed by a pressure forming of this cord body 3, a bundle of fibers 7 or a sheet of expanded graphite 6 can then be moved over the surface of the lining 1. It is preferable to have such a structure that the fiber bundle 7 is positioned at

  the exterior as mentioned.

  When PVA is used as an adhesive layer 8, the PVA layer is positioned inside the cord body 3, but it can be removed after formation of the cord body 3. The PVA layer is remarkable as reinforcement material, because it has a characteristic which can easily cause stress relaxation, by removing this layer, stress relaxation can be prevented. And so, there can be no stress relaxation in the lining 1. Additionally, when a reinforcing material is required, that is to say when the greater tensile force acts on the graphite sheet. expands 6, then, by building the braiding wire 2 and by building the cord body 3, there is no problem if the PVA layer

  is removed after construction of the cord body 3.

  When removing the cord body 3, impregnation of liquid resin in the cord body 3 is preferable. This is for a part where the PVA layer existed and / or is formed a space when removing the PVA layer. If the cord body 3 is soaked in the liquid resin, the space can be filled with the liquid resin. By filling the space with the liquid resin, the fluid passing from the interior of the cord body 3 can be prevented during the use of the trim 1 in the side of the trim box. Consequently, the sealing capacity of the seal 1 can be increased. As liquid resin for the impregnation of the cord body 3, the examples are constituted by a fluorocarbon resin such as polytetrafluoroethylene (PTFE) resin, silicone resin, water-soluble phenolic resin, and the emulsion resin comprising a mineral spray powder such as glass, alumina, silica gel, graphite and titanium. Likewise, for the cord body 3, more than one or two liquid resins chosen from a group composed of these liquid resins can be impregnated. As an impregnation process, for example, there are natural dipping (dipping impregnation), hot impregnation and vice impregnation. A gasket 1 can be obtained by pressurizing this cord body 3. The gasket 1, for example, as mentioned in FIG. 5, is formed with the shape of a ring. The packing 1 which is formed with a ring shape is placed in a packing bowl and used suitably as a packing for the sealing of a fluid apparatus. The lining 1 as mentioned previously has a structure in which the fiber bundle 7 or the expanded graphite sheet 6 is positioned on the surface. Therefore, the packing 1 can be manufactured to have remarkable lubrication capacity, sealing capacity, abrasion resistance, mechanical resistance and corrosion resistance. The packing 1 can be manufactured which has more lubrication capacity, sealing capacity, abrasion resistance, mechanical resistance and corrosion resistance by having the structure or the fiber bundle 7 appear on the surface of the

trim 1.

  Compared to that with the PVA layer removed, the packing 1 with the PVA layer can be produced without the removal operation and it is thus not only possible to manufacture it easily, but also

  lower manufacturing costs.

  On the other hand, the lining in which the PVA layer is removed has no capacity for stress relaxation due to the PVA layer. Therefore, the sealing capacity thereof can be increased more than with the PVA layer. Likewise, the lining 1 comprising the cord body 3 which is impregnated with the liquid resin after removal of the PVA layer is in a condition where the interior of the cord body 3 without capacity for stress relaxation is completely filled,

  which can further increase its sealing capacity.

  A method of manufacturing the lining 1

  exposed will be explained now.

  This method of manufacturing the lining 1, as mentioned above, consists of a laminated film 5 which is formed by laminating and binding the bundle of fibers 7 by means of the adhesive layer 8 on the sheet. expanded graphite 6 (first treatment); the strip laminated sheet 4 is formed by cutting the laminated sheet 5 in the longitudinal direction of the fiber bundle 7 (second treatment); the braiding wire 2 is formed by winding or twisting this laminated sheet in strip 4 (third treatment); the cord body 3 is formed by braiding this braiding wire 2 (fourth treatment); and the cord body 3 is formed under pressure at the end

(fifth treatment).

  The details of each process will be explained

successively and later.

  The first treatment is explained. When laminating the fiber bundle 7 on a surface of the expanded graphite sheet 6, the adhesive layer 8 made of PVA and chloroprene rubber is sandwiched between the fiber bundle 7 and the expanded graphite sheet 6, and it can be laminated and reinforced by pressurization in the thickness direction of this three-layered structure on both sides or one side, or it can also be laminated and reinforced by pressurization with heating. It is preferable to use expanded graphite sheet 6 with

  an irregularity in the crystal level on its surface.

  By doing so, the expanded graphite sheet 6 can cause an anchoring effect on the adhesive layer 8 for laminating the fiber bundle 7. By using this expanded graphite sheet 6, it becomes possible to satisfactorily laminate the bundle of fibers. fibers 7. The adhesive layer 8 can be formed, for example, by application or spraying. When the adhesive layer 8 is a PVA layer in the form of a nonwoven fabric, the PVA layer is formed by spraying an aqueous solution of PVA under hydraulic pressure on the first side of the expanded graphite sheet 6 or of the bundle of fibers 7. By spraying an aqueous PVA solution with hydraulic pressure, the aqueous PVA solution stagnates on the expanded graphite sheet 6 or the fiber bundle 7. At that time, each fiber agglomerates in a state of stretch in directions

  irregular and being reciprocally interspersed.

  Then, while performing the spraying work for a period of time, the fiber which is in a state of stretching in irregular directions and of intertwining accumulates and agglomerates, and the layer of PVA in the form of

non-woven fabric is thus formed.

  The second treatment is explained. The laminated strip sheet 4 is formed by cutting the laminated sheet 5 along the longitudinal direction of the bundle of the fiber bundle 7. At this time, when considering the following twisting or winding treatment, it is better to cut the

  laminated sheet 5 with its width below 25 mm.

  Since the expanded graphite sheet 6 has a structure which is reinforced with the PVA layer and with the fiber bundle 7 as mentioned above, even with its width below 25 mm or even below 10 mm, it can withstand the tensile force which occurs during torsional or winding treatment. Furthermore, since the sheet laminated in strip 4 has its structure which is sufficiently reinforced, it can be formed comparatively thin, and even with its width in the range mentioned above, it is remarkably flexible and facilitates the processing of

twist and winding.

  The third treatment is explained. The braiding wire 2 is formed by twisting or winding the laminated sheet in strip 4. As mentioned above, the laminated sheet in strip 4 can withstand the tensile force which appears during the winding process or torsion, even with its width below 10 mm. Likewise, since the sheet laminated in strip 4 with its width below 10 mm is remarkably flexible, it can easily be treated by twisting and winding. Since the braiding thread 2 which is obtained in this way is flexible

  remarkable, a complex braiding can be achieved.

  Additionally, it is possible to construct a braiding wire 2 which is reinforced with the reinforcing wire 9 as has been mentioned above. In this case, the strip laminated sheet 4 can be treated by twisting and winding so that the strip laminated sheet 4 covers the reinforcing thread 9. The possible pulling force of the braiding thread 2 can then

be increased.

  A fourth treatment is explained. The cord body 3 is formed using the different braiding methods as mentioned above with this braiding wire 2. Since the braiding wire 2 is remarkably flexible, complex braiding can be carried out. Consequently, the cord body 3 which is obtained from the braiding thread 2 is remarkably flexible. Of

  additional way, as mentioned above

  above, the PVA layer in tent that adhesive layer 8 can be removed from the bead body 3 after construction of the bead body 3. Regarding the method of removing the PVA layer, a soaking process

  in the water of the cord body 3 can be mentioned.

  Since PVA resin is a synthetic water soluble resin, it can be dissolved quickly and easily and removed by soaking in water. By removing the PVA layer in this way, the stress relaxation of the PVA layer can be removed from the

cord body 3.

  When removing the PVA layer, the impregnation of the cord body 3 with a liquid resin in order to fill the space formed by the withdrawal is preferable. By doing so, the space is filled. Consequently, it becomes possible to obtain a stuffing box packing made of expanded graphite 1 with less stress relaxation and a high sealing capacity. The fifth treatment is explained. A lining 1 is formed by pressure forming of the cord body 3 in a motile. The shape of the lining 1 is not particularly limited, but it is not

  normally not in the form of a ring.

  This is the end of a manufacturing process.

the filling 1.

  Figure 10 is a view showing the third example of the first embodiment of braiding yarn of the present invention. The example represented in FIG. 1 and FIG. 2 is applicable mainly when a diameter of the reinforcing wire 9 is smaller than the width of the sheet laminated in strip 4, but when a length of a diameter of the reinforcing wire reinforcement 9 is the same or greater than the width of the laminated sheet in strip 4, it is preferable to construct the braiding wire 2 by winding the laminated sheet in strip

  4 around the reinforcing wire 9 shown in FIG. 9.

  In the example shown in FIG. 10, the reinforcing wire is formed by binding several solid wires 90. Although the configuration of the connection is not particularly limited, for example, it can be constituted in the condition of round braiding wire represented in Figure 11 and Figure 12, square braiding wire shown in Figure 13 and Figure 14, cord and square cord. Additionally, in the case of cord braiding, as mentioned above, a spontaneous braiding process with four, eight or sixteen braiding threads was used. It is also possible to use several solid wires 90 which are tied and twisted as shown on the

figure 15.

  In this example, the strip laminated sheet 4 can be reconstituted by laminating and bonding the fiber seal 7 and the expanded graphite sheet 6 with the adhesive layer interposed, and by cutting this fiber bundle 7 in the longitudinal direction. Since the braiding wire 2 represented in FIG. 10 is used with the quantity of reinforcing wire 9 per unit of surface as in the sectional view represented in FIG. 16, the mechanical resistance is important due to the structure of the surface. braiding wire 2 which is covered by the laminated strip 4 which consists of the expanded graphite sheet 6 and the fiber bundle 7, the sealing characteristic which is presented by the expanded graphite and the fiber bundle 7 appears sufficiently, in addition, the braiding wire 2 does not damage the surface of another metal. Consequently, since the very high mechanical resistance appears, for example, the braiding wire 2 is used in

  replacement of sleeves and spacers.

  Figure 7 is a view showing a fourth example of the first embodiment of a wire

braid of the present invention.

  In the fourth example, the braiding wire 20 is formed by covering the peripheral side of the braiding wire 2 with a sheet made of aluminum and so on represented in the first, the second and the third example of the first embodiment of the braiding thread 2, for example, represented in FIGS. 1, 8, 9 and 10. In summary, the braiding thread 2 which is concerned by the first and second example is considered to be a partially manufactured object (designates filament 2) braiding wire 20 which is concerned with the fourth example. The braiding wire 20 (see Figure 7) is then formed by a filament which is formed by winding or twisting a sheet made from a metal such as aluminum, aluminum alloy, nickel, l nickel alloy, copper and copper alloy, to cover

  filament 2 continuously or intermittently.

  In the braiding wire 20 shown in Figure 7, the sheet 21 which is made of aluminum and aluminum alloy is posltlonnee nlveau the partle surface. Since metals such as aluminum are remarkable in terms of forming capacity, the lining is formed by the braiding wire 20, and when this lining is used in a lining bowl, these metals adhere strongly to the surface of the stuffing box. Therefore, the sealing capacity can be further improved. Likewise, in the case where the coating component is not placed on the surface of the expanded graphite and the carbon fiber bundle, when the expanded graphite and the carbon fiber bundle are used in the packing box, and so on, there is a possibility of detachment of a space

  between a shaft and a bearing by a fixing pressure.

  However, with regard to this example, by covering the outside of the expanded graphite and the bundle of carbon fibers with the sheet 21, it is possible to prevent the separation of the expanded graphite and the bundle of carbon fibers from the space. In addition, when the expanded graph and the carbon fiber bundle are exposed, there is the possibility of building an electric battery pole

  between these components and a stuffing box.

  However, with metals such as aluminum mentioned above, it is difficult to build a local pile electric pole mainly with mainly ferrous metals, and even if it becomes an electric pole, it becomes an anode, so that There is no possibility of machine corrosion such as

  trim box which is made of steel.

  Furthermore, a thickness of the sheet 21 is not particularly limited, but 0.01 0.05 mm is desirable, 0.02 0.03 mm is even more desirable, and 0.03 mm is most preferred. Bringing the thickness below 0.01 mm is difficult and very thin to ensure durability. When a Thickness is greater than 0.05 mm, the adhesion with expanded graphite or with the carbon fiber bundle decreases with the sealing capacity of the expanded graphite or the carbon fiber bundle which

is not sufficiently present.

  Likewise, a width of the sheet is not particularly limited, for example an area of 3 mm is bonnet. In addition, in the case of the construction of a braiding thread 20, one or more sheets 21 can be used. several sheets 21 are used, they can be used with an overlap of sheet 21. The following is an explanation of the second embodiment of the present invention by se

Refer to the drawings.

  Fig. 17 is a view showing a process for manufacturing the braided yarn of the second embodiment. Additionally, a cord body is explained by applying Figure 4 showing the

pemiAre form of achievement.

  The braiding wire 2 of the second embodiment is a filament in which, after the rolling operation of a sheet of expanded graphite in strip 6 with a reinforcing wire 9, a body of wire 10 is formed by winding or twisting of these laminates; a filament is formed by winding or twisting a bundle of fibers in a strip so as to cover the body of filament in the manner of a tree. Figure 17

  represents an aspect of the twist of the fiber bundle 7.

  The thickness of the expanded graphite sheet which is used in this embodiment is preferably about 0.05 to 0.5 mm. The reason is that, when the thickness is below 0.05mm, there is a possibility of rupture of the expanded graphite sheet 6 itself after the rolling operation because it is too thin, on the other hand, when the thickness is greater than 0.5 mm, there is a possibility of difficult twisting after the rolling operation because it is

too thick.

  This expanded graphite sheet 6 is cut into strips with a log splitter and the like, and the sheet of

  Expanded strip graphite 6 is produced in this manner.

  It is preferable to have 3 to 30 mm in width of the expanded graphite sheet in strip 6, and with such a width, it can be laminated easily and

  certainly with the reinforcing wire 9.

  This sheet of expanded graphite in strip 6 is rolled under pressure by a rolling cylinder and a material where the reinforcing wire 9 is embedded in the orientation of the shaft length inside the sheet of expanded graphite 6 is FORMED. After that, this laminated material becomes a filament body 10 thanks to a

  winding and twisting treatment (see Figure 17).

  Additionally, when obtaining the filament body 10, a unique rolling process which is used to laminate the laminated material in one go or a rolling

  double that rolls twice can be used.

  The shape of the section of the reinforcing wire 9 is not particularly limited. Similarly, the materials of the reinforcing wire 9 are not particularly limited, for example, the materials the same as for the reinforcing wire

  9 which is mentioned above may be applicable.

  The diameter of the reinforcing wire 9 is not particularly limited, but about 0.08 to 0.20 mm in diameter is desirable, and about 0.12 to 0.15 mm in diameter is even more desirable. If the diameter is less than 0.20 mm, it can be surely embedded in the expanded graphite sheet in strip 6, and said twisting treatment of the laminated material can easily

to be realized.

  The reasons for using the reinforcing wire 9 in the third embodiment wind to produce laminated materials which can fully support a twist treatment and to produce a braiding wire which can fully support a braiding treatment

  (especially mechanical braiding).

  In other words, as a laminated material or a braided film in which only expanded graphite is used at low tensile strength, they are fragile and are easily torn and shrunk. More specifically, this braiding wire cannot be used as a braiding wire for mechanical braiding. However, by constructing a laminated material in which the reinforcing wire 9 is embedded inside the expanded graphite sheet 6, significant resistance of the reinforcing wire 9 is given to the expanded graphite sheet 6, and thus, a laminated material and a braiding thread which is suitable for

  twist treatment and mechanical braiding.

  The braiding wire 2 is produced by a twisting or winding treatment of the fiber bundle 7 with this

  filament body 10 which is covered (see Figure 17).

  With said laminated material which is treated as a filament as a single wire, the braiding wire 2 can be constituted by the bundle of fibers 7 which is wound or twisted around this filament, or else the braiding wire 2 can be constituted by the bundle of fibers in strip 7 which is wound or twisted with several so-called single threads

  twists together in the form of a twisted wire.

  The bundle of strip fibers 7 serves to improve the mechanical strength, the lubrication capacity and the

  sealing capacity of the braiding wire 2.

  Additionally, it is preferable to have the thickness of the fiber bundle in strip 7 which is 0.05 to 0.5 mm, and it is even more desirable that it be 0.15 to 0.2 mm. This is due to the fact that, if the thickness is below 0.05 mm, neither a sufficient lubrication capacity nor a sealing capacity can be obtained and, conversely, if the thickness is greater than 0.5 mm, sufficient flexibility cannot

to be obtained.

  The braiding wire 2 obtained in this way does not tear or contract easily, and is braided with a braiding machine, so that the body of

  cord 3 as shown in Figure 4 is obtained.

  Thanks to a pressure forming of this cord body 3, a ring-shaped packing 1 is obtained

(see figure 5).

  Since this stuffing box packing made of expanded graphite 6 is made from the braiding wire 2 which not only has a great possible tensile force but also is remarkably flexible, it is possible to easily make the packing 1 and to improve its sealing capacity. Likewise, having the bundle of strip fibers 7 positioned on the outside of the expanded graphite gland packing 1 may improve the lubrication capacity, the sealing capacity, the abrasion resistance and the resistance. corrosion of the same

  as in the first form of realization.

  In addition, in this second embodiment, it is possible to use a sheet as has been mentioned above (which is not illustrated) in place of the bundle of fibers in strip 7. As materials for this sheet, for example, aluminum, aluminum alloy, nickel, nickel alloy,

  copper and copper alloy can be used.

  When a sheet is used, a piece of sheet or several sheets can be used, and when a sheet is used with several sheets, these sheets can be used with a mutual overlapping condition. The following serves to explain the third form of production of the braided thread of the present invention in

referring to the drawings.

  FIG. 18 is a view showing a process for manufacturing a braided yarn of the third embodiment. [a Figure lg is a sectional view showing a strip laminated sheet which is used when the wire

  braid reprAsentA in Figure 18 is constituted.

  The structure of the braid thread 2 of the third

  form of achievement is explained below.

  [braiding yarn is made up by winding or twisting a bundle of strip fibers 7 in which a filament body 10 which is formed by winding or twisting the strip laminated sheet 40 consists of the layer of PVA 80 placed at least on a catA of the expanded graphite sheet 6 is covered in alignment. In addition, Figure 18 explains a case where the beam of

  Fiber in strip 7 is produced by a twisting procAdA.

* [the structure as well as the material and the thickness of the expanded graphite sheet can be the same

  that in the first embodiment mentioned above

  above. Likewise, the thickness of the layer of PVA 80 and the positioning process can be the same as for the layer of PVA serving as an adhesive as has been mentioned above. The laminated sheet which is formed from the expanded graphite sheet 6 and the PVA layer is cut into strips and becomes a strip laminated sheet 40. In addition, its width is not particularly limited, but for example , it is from 5 to mm, and is preferably from 5 to 25 mm. In this third embodiment, since the expanded graphite sheet is reinforced by the layer of PVA 80, the thickness of the sheet laminated into strips can be relatively thin. Therefore, even if the width is about 30 mm, one can obtain the laminated strip sheet which has easy processing, resistance to

  tension in the treatment and sufficient flexibility.

  The braiding thread 2 is formed by winding or twisting the bundle of fibers 7 in which a filament body 10 which is formed by the laminated sheet in a strip with a winding or twisting in the same way as the second embodiment is covered try that soul. In addition, when the filament body 10 is formed, it is possible to construct the filament body 10 by winding or twisting a laminated sheet in a strip so as to cover the reinforcing wire 9. Likewise, a unique rolling process which consists in laminating the bundle of fibers 7 by winding or twisting once or else a double rolling which consists in laminating the bundle of fibers in strip 7 again by winding

or twist can be used.

  Then, the cord body 3 (see FIG. 4) can be obtained by braiding this braiding wire 2. Then, the ring-shaped packing gland 1 can be obtained by being formed under pressure with this body of

  cord 3 (see for example Figure 5).

  In addition, in this third embodiment as in the first embodiment, the stuffing box packing 1 can be obtained by pressure forming of the cord body 3 or, once the cord body 3 is formed, the cord body 3 has the layer of PVA 80 removed by elusion and is dried. Likewise, this cord body 3 can be obtained in which a cord body 3 is dried once the PVA is removed by elusion; it is impregnated with liquid resin as in the

  first form of realization; it is formed under pressure.

  Each embodiment of this invention has been explained above, however, the structures of the strip laminated sheet 4, the braiding wire 2, the cord body 3 and the trim 1 of the present invention are not limited. to the embodiments mentioned above. For example, in the first and third embodiments, the stratification of the PVA layer can be done by spraying an aqueous solution of PVA as mentioned above, but the stratification process of the present invention is not limited to this process. For example, it is possible to form a PVA sheet of non-woven fabric (which is not illustrated) by spraying an aqueous PVA solution on a surface of a heated roller and laminating this PVA sheet on the surface of the sheet. of expanded graphite 6 by thermal fusion. In this case, the temperature used for thermal melting is preferably 185 to 195 C. If the temperature is below 185 C, there is a risk of having insufficient melting, and on the other hand, if it is above 195 C, there is a risk that the organization of the non-woven fabric is broken. In addition, the PVA layer does not have to be a non-woven fabric, and it can be in the form of a film or a mesh. If the PVA layer is in the form of a film, the PVA resin previously formed in the form of the film can be laminated on the expanded graphite sheet 6 by thermal melting. If the PVA layer is in the form of a lattice, the PVA resin formed beforehand in the form of a lattice can be laminated on the expanded graphite sheet 6 or the fiber bundle 7. The following is used to explain the shapes of realization of the present invention. However, the present invention is not particularly limited to these

forms of realization.

  Laminated sheet tensile test Embodiment A laminated sheet was formed by laminating a bundle of fibers 0.2 mm thick by means of a layer of PVA adhesive on a surface of expanded graphite sheet of 0.2 mm thick and 1.1 g / cm3 density, then the whole was laminated and

  joined by thermal fusion of a layer of PVA adhesive.

  Then, a test strip 14 was formed by cutting this laminated sheet to the size shown in Figure 20. The unit of length used in Figure 20

is the millimeter.

  Comparative test A laminated sheet was formed by laminating a sheet of woven cotton fabric 0.15 mm thick using a thermal fusion film on the two surfaces of the 0.2 mm thick expanded graphite sheet. and 1.0 g / cm3 density. Then, a test strip 14 was formed by cutting this laminated sheet to the size shown in Figure 20. Four of these test strips 14 exposed in the embodiment and the comparative test were prepared, and for these test strips, wind tensile force tests based on JIS K6301-1975 (test method for the property of vulcanized rubber) at a temperature of 22 C. As a tensile test device, a device for resin tensile test manufactured by

Toyoseiki Co. Ltd. is used.

  The test result of the embodiment is shown in Table 1, and the test result of

  the comparative test is shown in table 2.

Table 1

  Form of Tensile Strength (N / mm2) Realization N Measured Value Average Value

1,65.2

2 64.6 64.73

3 65.4

4 63.7

Table 2

  Comparative example Tensile strength (N / mm2) N Measured value Average value 1 2.8

2 2.7 2.8

2.7?

  4 2.9 From the above results, it is clear that the tensile strength of the embodiments where the PVA layer and the wind fiber bundle used as reinforcing materials is obviously greater than that of the comparative test where cotton woven canvas is used

as reinforcement material.

  Torque test of a stuffing box packing made of expanded graphite A laminated sheet was formed by laminating a bundle of fibers 0.2 mm thick by means of an adhesive layer of PVA on a surface of expanded graphite 0.2 mm thick and 1.0 g / cm3 density, and the whole was laminated and bonded using thermal fusion of the PVA adhesive layer. Then, a strip laminated sheet was formed by cutting this laminated sheet to a width of 10 mm. Then, a braiding wire was formed by a process of twisting this laminated sheet, and a cord body is formed by braiding this braiding wire, and finally, it is formed under pressure in order to build a press lining. -toupe shaped ring made of expanded graphite. In addition, provision is made for the fiber bundle to be positioned outside the gland packing. In addition, the size of the stuffing box packing made of expanded graphite was +8 x ó18 x t 6 (1: inside diameter, +2: outside diameter, t: thickness (the unit for the set

is the millimeter)).

  Comparative test A laminated sheet was formed by laminating a cotton woven fabric 15 mm thick using a thermal melting film on an expanded graphite sheet surface of 0.2 mm thick and 1.0 g / cm3 of density. Then, a strip laminated sheet was formed by cutting this laminated sheet to a width of 10 mm. Then, the braiding wire was formed by a process of twisting this laminated sheet, and a cord body is formed by braiding this braiding wire, and finally, it is formed under pressure in order to build a press lining. -toupe in shape

  ring made of expanded graphite.

  Furthermore, the size of the stuffing box packing made of expanded graphite was ó8 x ó2 18 xt 6 (1: inside diameter, ó2: outside diameter, t: thickness (the unit for the whole is the millimeter) ). Fig. 21 is a view showing a situation of the embodiment of the torque test. For the performance of the torque test, four gland packings made of expanded graphite 1 of the present invention were prepared, and these four gland packings made of expanded graphite 1 were installed and moved in a box. to packing 100 of an internal fluid apparatus at a temperature of 22 C. Then, a pin 11 manufactured in SUS 430 with a shaft of ó8 (the unit is the millimeter) was inserted in the bore of insertion insertion tree of the

  stuffing box packing made of expanded graphite.

  A locking nut 12 was then locked with a locking pressure of 1962 N / cm2, so that each stuffing box packing made of expanded graphite 1 was pressure welded to the wall surface

  inside of pin 11 and a trim box 100.

  Then the spindle 11 was pulled with a spring balance 13, and the tensile force (which is equal to the maximum friction force between the spindle and the packing) which appeared when the spindle 11 started to move was measured . The same test was carried out for the stuffing box packing manufactured apart from the foil of expanded graphite exposed in the comparative test. The result of the test of the embodiment is - 7 shown in Table 3, and the test result of

  The comparative test is shown in Table 4.

Table 3

  Force Form of t: ^ action (N) realization N Measured value Average value

1 16.41

2 16.87 16.02

3 15.50

4 15.30

Table 4

  Comparative example Tractive force (N) N Measured value Average value

1 17.66

2 18.64 19.38

3 19.62

4 21.58

  From the above result, it is clear that the tensile force of the embodiment in which the layer of PVA and the bundle of wind fibers used as reinforcing materials is less than that of the comparative test or the cotton woven canvas is used as a reinforcement material. This indicates that the lubrication capacity of the gland packing exposed in the embodiment is bonnet Therefore, when rotating a spindle inserted in a packing, it is found that the use of the packing tow 1 according to the embodiment

  can allow the spindle to be turned with low torque.

  The present invention in a first aspect is a braiding wire which is used in a stuffing box packing made of expanded graphite which is obtained by pressure forming of a cord body constituted by braiding the braiding wire in which a bundle of fibers is laminated and bonded to the expanded graphite sheet by means of a layer of adhesive, a sheet laminated in a strip with this layer of adhesive as reinforcement material is transformed into filament by

  winding or twisting, and thus has the following effect.

  That is to say, since said braiding wire can be formed from the strip laminated sheet which is remarkably flexible with the band width which is below 30 mm, the braiding wire can also be distinguished in terms of flexibility. Therefore, a complicated braiding treatment can easily be performed. Likewise, the possible tensile force of the strip laminated sheet for the construction of this braiding wire is large, and there is therefore no risk of tearing during a winding treatment, a treatment of twist and braiding treatment. In addition, in the case where this braiding thread is treated with the carbon fiber bundle positioned outside, at the moment when a lining is formed, the bundle of carbon fibers can be positioned on a surface of the lining. In this case, it is possible to have the seal which is remarkable in terms of the lubrication capacity, the sealing capacity, the abrasion capacity and

corrosion capacity.

  The present invention in a second aspect is a braiding wire as previously exposed with the characteristic of the laminated sheet in strip mentioned above which is a filament by a winding or twisting treatment, and thus presents the following effects . That is to say, since this braiding thread is stored as reinforcing thread, it can further increase the resistance to a winding treatment, a

  twist and braiding treatment.

  The present invention as set out in another aspect is a braiding wire used in a stuffing box packing made of expanded graphite which is obtained by pressure forming of a cord body constituted by braiding with a braiding wire in which a polyvinyl alcohol layer is arranged on at least one side of the foamed graphite sheet, and a filament is formed by winding or twisting a laminated sheet in a strip with this layer of polyvinyl alcohol as reinforcing material, and transforming a bundle of carbon fibers in filament by winding or twisting so that this filament is

  covered like a tree and thus has the following effect.

  That is to say, since this braiding wire can be formed from the sheet laminated into a strip with the strip width of 10 mm, the braiding wire can also be distinguished in terms of flexibility. Therefore, a complicated braiding treatment can easily be performed. Likewise, the possible tensile force of the strip laminated sheet intended to construct this braiding wire is large, and there is therefore no risk of tearing during a winding treatment, a twisting treatment. and braiding treatment. In addition, in the case where this braiding thread is treated as a bundle of carbon fibers positioned outside, at the moment when a lining is formed, the bundle of carbon fibers can be positioned on a surface of the lining. In this case, it is possible to have the seal which is remarkable in terms of the lubrication capacity, the sealing capacity, the abrasion capacity and

corrosion capacity.

  The present invention as set out in yet another aspect is a braiding wire used in a stuffing box packing made in expanded graphics which is obtained by pressure forming of a cord body constituted by braiding a braid wire in which a bundle of sheet laminated into a strip is transformed into a filament by winding or twisting so that it covers the filament serving as a core, and this filament is constituted by a laminated material which is obtained by rolling a sheet of expanded graphite with

  a reinforcing wire, and thus presents the following effects.

  That is to say, since the braiding wire can be distinguished in terms of flexibility with a large possible pulling force, it is possible to obtain a packing gland made of expanded graphite which is remarkable. in terms of ease of manufacture and sealing capacity. Likewise, when a bundle of fibers is positioned outside, it is possible to obtain a lining which is remarkable in terms of lubrication capacity, sealing capacity, resistance to

  abrasion and corrosion resistance.

  The present invention as set forth in another aspect is a cord body in which a braiding wire as previously exposed is braided, that is to say it has the following effects. The braiding wire can be distinguished in terms of flexibility with a large possible pulling force, it is possible to obtain a cord body distinguished in terms of flexibility without a fracture point even with a complicated braiding treatment. Likewise, when a bundle of fibers is positioned outside the cord body, the bundle of fibers can be positioned on a lining surface. In this case, it is possible to obtain a gasket which is remarkable in terms of abrasion resistance and corrosion resistance. Likewise, since the fiber bundle is remarkable in terms of lubrication capacity and sealing capacity, it is possible to obtain a lining which is remarkable in terms of lubrication capacity

and sealing capacity.

  The present invention also relates to a cord body in which a braiding wire as previously exposed is braided, and said layer of polyvinyl alcohol is removed after said braiding treatment, and thus it has the following effects. By removing the layer of polyvinyl alcohol which easily causes stress relaxation, it is possible to make a cord body which does not cause stress relaxation. It is thus possible to manufacture a gasket which does not cause stress relaxation, and to increase the sealing capacity of

the garnish.

  The present invention also relates to a cord body, in which a braiding wire as exposed above to more than one or two liquid resins chosen from a group composed of a fluorocarbon resin such as a polyfluoroethylene resin and equivalent , a silicone resin, a water-soluble phenolic resin, and an emulsion resin comprising mineral spray powder such as glass, alumina, silica gel, graphite and titanium, which are impregnated, and it thus presents the following effects. A space formed by removing the layer of polyvinyl alcohol can be filled with the liquid resin. By filling the space with the liquid resin, the fluid can be prevented from passing into the interior part of the cord body when using a lining in a lining box,

  which further increases the sealing capacity.

  The present invention also relates to a stuffing box packing made of expanded graphite which is made by pressure forming of a bead body as set out above, and it thus presents the following effects. By building a bead body which is remarkably flexible and has no fracture point, it is possible to make a gasket which is remarkable in terms of sealing capacity. Likewise, when a bundle of carbon fibers is positioned outside the lining, it is possible to manufacture a lining which is remarkable in terms of abrasion capacity and corrosion capacity. Likewise, a bundle of carbon fibers is remarkable in terms of lubrication capacity and sealing capacity, and it is possible to make a gasket which is remarkable in terms of lubrication capacity and capacity of tightness. Likewise, the construction from a laminated sheet which has a significant tensile force and is of remarkable flexibility makes it possible to manufacture a lining which offers a

easy processing.

Claims (16)

REVENDI CAT ION S   1. Braiding wire used in a stuffing box packing (1) made of expanded graphite which is obtained by pressure forming of a cord body (3) formed by braiding the braiding wire (2), characterized by that a bundle of fibers (7) is laminated and bonded through an adhesive layer () on an expanded graphite sheet surface, this adhesive layer (8) is used as a backing material for a sheet strip laminate (6), and sheet laminate strip   (6) is wound and twisted to form a filament.   2. braiding wire according to claim 1, characterized in that said strip laminated sheet (6) is wound or twisted so as to be a filament so that the laminated sheet (6) covers a thread reinforcement (9).   3. braiding wire according to claim 1, characterized in that a filament body is formed, and a filament is formed from a sheet of strip fabricated from aluminum, aluminum alloy, nickel, nickel alloy, copper or copper alloy so that a filament covers this whole filament body with continuous or intermittent.   4. Braiding wire used in a stuffing box packing (1) made of expanded graphite which is obtained by pressure forming of a cord body (3) formed by braiding the braiding wire (2), characterized by that a layer of polyvinyl alcohol is placed on at least one side of an expanded graphite sheet, the layer of polyvinyl alcohol is used as reinforcing material for a laminated strip sheet (6) which constitutes a body of filament by winding or twisting, a filament is formed from a bundle of carbon fibers (7) by winding or twisting so that it   covers the filament body in alignment.   5. braiding wire according to claim 4, characterized in that, when a filament body is formed from said strip laminated sheet (6), a filament is formed from said strip laminated sheet (6) by winding or twist so that this strip laminated sheet (6) covers a reinforcement wire (9).   6. Braiding wire used in a stuffing box packing (1) made of expanded graphite which is obtained by pressure forming of a cord body (3) formed by braiding the braiding wire (2), characterized in that that a filament body is formed by winding or twisting a laminated material which is obtained by laminating a sheet of expanded graphite in a strip with a reinforcing wire (9), a filament is formed from a bundle of fibers (7 ) by winding or twisting such   so that it covers this body of filament in alignment.   7. Braiding wire used in a stuffing box packing (1) made of expanded graphite which is obtained by pressure forming of a cord body (3) formed by braiding the braiding wire (2), characterized in that a filament body is formed by winding or twisting a laminated material which is obtained by rolling 2838800   of a sheet of expanded graphite in a strip with a reinforcing wire (9), a filament is formed from a sheet of strip made of aluminum, aluminum alloy, nickel, nickel alloy, copper or copper alloy so that it covers this body with filament in alignment.   > 3. Braiding wire according to claim 2, 5, 6 or 7, characterized in that said reinforcing wire (9) is made from at least one material of aramid resin, polytetrafluoroethylene resin, Nylon resin, acrylic resin, hydroxybenzene resin or carbide resin thereof, glass, metal, asbestos or a variety of ceramics.   9. Cord body characterized in that it comprises a braiding thread (2) according to any one of claims 1 to 8.   10. Cord body characterized in that a thread has   braid (2) according to any one of claims 1 a   3, or said adhesive layer is an alcohol layer   polyvinyl, or according to any one of claims   4 or 5, is braided and in that said layer of alcohol   polyvinyl was removed after braiding.   11. Cord body with a braiding wire (2) according to claim 10, characterized in that more than one or two liquid resins which are chosen from a group composed of a fluorocarbon resin such as a polytetrafluoroethylene resin and equivalent, a resin silicone, a water-soluble phenolic resin, and an emulsion resin comprising a mineral spray powder such as glass, alumina, silica gel, graphite and titanium, impregnated wind.   12. Cable gland packing made of expanded graphite, characterized in that it is made by pressure forming a bead body (3) according to one   any of claims 9 to 11.   13. Method for manufacturing a press lining   tow (1) made of expanded graphite, characterized in that a bundle of fibers (7) is laminated and bonded to an expanded graphite sheet surface by means of an adhesive layer (8), a laminated sheet ( 5) is formed with this adhesive layer (8) as reinforcing material; a strip laminated sheet (6) is formed by cutting this laminated sheet (5), a braiding wire (2) is formed by winding or twisting this strip laminated sheet (6), a cord body (3) is formed by braiding this braiding thread (2), and a body   of cord (3) is formed under pressure.   14. Method for manufacturing a press lining   thimble (1) made of expanded graphite, characterized in that a layer of polyvinyl alcohol is placed on at least one side of a sheet of expanded graphite, a laminated sheet (5) is formed with a layer of polyvinyl alcohol as reinforcing material, a strip laminated sheet (6) is formed by cutting this laminated sheet (5), a filament body is formed by winding or twisting this strip laminated sheet (6), a braiding wire (2 ) is formed by winding or twisting a bundle of carbon fibers (7) so as to cover this body of filament in alignment, a cord body (3) is formed by braiding this braiding wire (2), and a cord body (3) is formed under pressure.   15. Method for manufacturing a press lining   tow (1) made of expanded graphite according to claim 13, characterized in that, once a cord body (3) is formed from a braiding thread (2) with said adhesive layer (8) as than a layer of polyvinyl alcohol, the polyvinyl is removed from this cord body (3) by dipping in water, the cord body (3) is dried and this cord body (3) is then form under pressure.   16. Method for manufacturing a press lining   tow (1) made of expanded graphite according to claim 14, characterized in that, once said cord body (3) is formed, the polyvinyl is removed from this cord body (3) by soaking in water, the cord body (3) is dry, and the cord body (3) is then forms under pressure.   17. Method for manufacturing a press lining   tow (1) made of expanded graphite according to claim 15 or 16, characterized in that, after drying of the bead body (3) which has been removed by elusion, more than one or two liquid resins chosen from a group consisting of a fluorocarbon resin such as polytetrafluoroethylene resin and the like, a silicone resin, a water-soluble phenolic resin, and an emulsion resin comprising a mineral spray powder such as glass, alumina, gel gel silica, graphite and titanium, impregnated wind, and the