JP6749214B2 - Sealing material composition - Google Patents

Description

The present invention relates to a sealing material composition.

As a sealing material composition used for producing a sealing material, for example, a yarn as described in Patent Document 1 is known. This type of yarn is composed of a tubular member formed by knitting or braiding a fibrous material, and a plurality of fibrous members (fibrous expanded graphite) filled in the tubular member.

The plurality of fibrous expanded graphites are elongated ones having flexibility, and are put into the tubular member so that the longitudinal direction of each of the fibrous expanded graphites substantially coincides with the longitudinal direction of the tubular member. After that, while being flexibly deformed, the cylindrical members are filled in a state of being randomly arranged (see FIG. 6 ).

Therefore, in the tubular member, a non-uniform gap is likely to occur between the adjacent fibrous expanded graphites of the plurality of fibrous expanded graphites, and generally, a large number of such gaps are included. It was like this. Moreover, these gaps tended to exist at relatively short intervals in the longitudinal direction of the tubular member.

Therefore, for example, when the yarn is bent and bent to manufacture a sealing material using the yarn or to convey the yarn while winding the yarn around a round rod-shaped member such as a bobbin, the yarn is curved. There was a case where the bent portion was sharply bent, and any of the plurality of fibrous expanded graphite was broken.

That is, when the yarn is subjected to a bending action by an external force, it is possible to allow a predetermined amount of bending depending on the external force, but when the external force is more than the allowable amount, the plurality of fibrous expanded graphite It had the potential to cause defects. Therefore, there is a risk that the defects of the plurality of fibrous expanded graphite may cause a deterioration in the performance of the sealing material manufactured using the yarn.

JP, 2007-138315, A

The present invention has been made in view of such circumstances, and in a sealing material composition provided with a sheet-shaped member containing expanded graphite, to provide a sealing material composition that is less likely to cause defects in the sheet-shaped member. To aim.

The present invention is
A stack,
A long enclosure surrounding the laminate,
The laminate is
Having a plurality of sheet-shaped members formed of expanded graphite in a tape shape,
A plurality of the sheet-shaped members are stacked in a direction intersecting the longitudinal direction of the enclosure,
Of the plurality of sheet-shaped members, the sheet-shaped members adjacent to each other in the stacking direction are provided in the longitudinal direction of the enclosure so as to be displaced and relatively movable with respect to each other,
The enclosure is
The sealing material composition allows relative movement in the longitudinal direction of the enclosure while maintaining the laminated state of the adjacent sheet-shaped members.

According to another aspect of the invention,
The sheet-shaped member,
A longitudinal direction one end portion, a longitudinal direction other end portion, a longitudinal direction midway portion connecting the longitudinal direction one end portion and the longitudinal direction other end portion,
The one end in the longitudinal direction and the other end in the longitudinal direction are in contact with the enclosure on opposite sides of the midway portion in the longitudinal direction.

According to yet another aspect of the invention,
One end in the longitudinal direction and the other end in the longitudinal direction of the sheet-shaped member extend in a direction inclined with respect to the longitudinal direction of the enclosure.

According to another aspect of the invention,
The longitudinal midway portion of the sheet-shaped member is provided so as to be inclined with respect to the longitudinal direction of the enclosure,
At least one of the one end in the longitudinal direction and the other end in the longitudinal direction of the sheet-shaped member is provided along the longitudinal direction of the enclosure.

According to the present invention, it is possible to provide a sealing material composition that does not easily cause a defect in the sheet-shaped member in the sealing material composition containing expanded graphite.

It is a perspective view of a sealing material composition concerning one embodiment of the present invention. It is a schematic plan view of the sealing material composition of FIG. It is a schematic partial cross section figure of the sealing material composition of FIG. It is a schematic partial cross section figure when the sealing material composition of FIG. 1 bends. It is a schematic partial cross section figure of the sealing material composition which concerns on another embodiment of this invention. It is a schematic partial cross section figure of the conventional sealing material composition which is a comparative example. It is a figure which shows an experimental result.

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic perspective view of a sealing material composition 1 according to an embodiment of the present invention. FIG. 2 shows a schematic plan view of the sealing material composition 1. FIG. 3 shows a schematic partial cross-sectional view of the sealing material composition 1.

In addition, regarding the sealing material composition 1 (the laminated body 5 (sheet-shaped member 10) and the surrounding body 6 described later), the arrow X direction in FIG. 1 is the longitudinal direction, the arrow Y direction is the lateral direction, and the arrow Z direction. Is the thickness direction (vertical direction). Further, the dimensional ratios in the drawings are exaggerated as appropriate for convenience of description, and may be different from actual ones.

The sealing material composition 1 is a member that contains expanded graphite as a material and forms a sealing material, and is used for manufacturing a sealing material such as a gland packing or a gasket. With respect to the sealing material composition 1, a part or all of the sealing material composition 1 can be used to form a part of the sealing material (for example, a core material) or the entire sealing material (for example, a molded packing).

As shown in FIGS. 1, 2, and 3, the sealing material composition 1 includes a laminated body 5 and an envelope body 6. The envelope body 6 is formed in a long shape, and is provided so as to surround the laminated body 5. In the present embodiment, the sealing material composition 1 is a string-shaped (long-shaped) member having a rectangular parallelepiped shape, and has a longitudinal length capable of manufacturing at least one sealing material such as a gland packing or a gasket. ..

The laminated body 5 has a plurality of sheet-shaped members 10. These sheet-like members 10 are formed in a tape shape (strip shape) from, for example, expanded graphite, are stacked in a direction intersecting with the longitudinal direction X of the enclosure 6, and are arranged with a predetermined interval in the longitudinal direction X. Has been done. Then, among the plurality of sheet-shaped members 10, the sheet-shaped members 10 adjacent to each other in the stacking direction are provided so as to be displaced in the longitudinal direction X of the enclosure 6 and relatively movable with respect to each other.

In the present embodiment, the sheet-shaped member 10 is a tape-shaped body made of expanded graphite containing expanded graphite as a main component. The sheet-shaped member 10 is a strip-shaped body having a substantially flat rectangular parallelepiped shape, and has a substantially constant thickness and a longitudinal length shorter than that of the surrounding body 6. The sheet-shaped members 10 are not limited to those having exactly the same shape, and may include manufacturing errors, as long as they have a shape capable of molding the laminated body 5.

The plurality of sheet-shaped members 10 are arranged so as to extend in substantially the same direction as each other. In the plurality of sheet-shaped members 10, one of the adjacent sheet-shaped members 10 is displaced by a predetermined amount in the longitudinal direction X of the enclosure 6 with respect to the other sheet-shaped member 10. In this state, the laminated body 5 is laminated so as to have a rectangular parallelepiped shape except both ends in the longitudinal direction.

Here, the direction intersecting with the longitudinal direction X of the envelope body 6, that is, the stacking direction of the plurality of sheet-like members 10 is in the thickness direction Z orthogonal to the longitudinal direction X and the lateral direction Y of the envelope body 6. It is the direction which inclines with respect to it.

Specifically, the adjacent sheet-shaped members 10 are slidable in the direction in which the sheet-shaped member 10 on one side and the sheet-shaped member 10 on the other side are substantially orthogonal to the stacking direction (longitudinal direction X of the enclosure 6). Are stacked so that The laminated state of the sheet-shaped member 10 on the one side and the sheet-shaped member 10 on the other side is maintained by the envelope body 6 regardless of these sliding movements.

Further, as shown in FIG. 3 in particular, the amount of deviation between the adjacent sheet-shaped members 10 regarding all the position deviation occurrence positions in the laminated body 5 (that is, the sheet-shaped member 10 on one side and the sheet-shaped member 10 on the other side) The deviation amount G is set to be substantially the same along the longitudinal direction X of the enclosure 6 in the initial state shown in FIG. ..

Then, in such a stacked state, the step portion 11 is formed between the adjacent sheet-shaped members 10 according to the thickness of the sheet-shaped member 10 on one side (or the sheet-shaped member 10 on the other side). .. The step portions 11 are formed on each of the upper surface side surface layer portion 8 and the lower surface side surface layer portion 9 of the laminated body 5, and are arranged at substantially equal intervals along the longitudinal direction X of the enclosure 6.

The amount of deviation G between the adjacent sheet-shaped members 10 in the initial state is not particularly limited, and the adjacent sheet-shaped members 10 move relative to each other (slide relative to each other), whereby the initial state is increased. Even if the amount of deviation is larger than the deviation amount G, it may be set so that the stacked state is maintained. For example, these shift amounts G may be different from each other.

Further, in the present embodiment, the sheet-shaped member 10 includes one end portion 13 in the longitudinal direction exposed to the surface layer portion 8 on the upper surface side and the other end portion 14 in the longitudinal direction exposed to the surface layer portion 9 on the lower surface side. And a midway portion 15 in the longitudinal direction. The longitudinal one end 13 and the longitudinal other end 14 of the sheet-shaped member 10 are on the opposite sides (the upper surface side surface layer portion 8 side and the lower surface side surface layer portion 9 side of the laminated body 5) sandwiching the longitudinal direction midway portion 15, respectively. It extends in a direction inclined with respect to the longitudinal direction X of the enclosure 6 so as to be in contact with the enclosure 6.

More specifically, as shown in FIG. 3, in the upper surface side surface layer portion 8 and the lower surface side surface layer portion 9 of the laminated body 5, a step is formed by the longitudinal direction one end portion 13 and the longitudinal direction other end portion 14 of the respective sheet-shaped members 10. The part 11 is formed. The longitudinal midway portion 15 forming the majority of each sheet-shaped member 10 has a predetermined inclination angle Θ1.

Each sheet-shaped member 10 forms one layer of the laminated body 5, and the laminated body 5 has a structure in which seven sheet-shaped members 10 are laminated. Here, the number of layers of each sheet-shaped member 10 is not particularly limited and may be appropriately set according to the thickness of each sheet-shaped member 10 and may be at least two layers.

Note that, in FIGS. 1 and 3, the gap is exaggerated between the adjacent sheet-shaped members 10. However, in practice, a plurality of sheet-shaped members 10 are stacked so that the gap hardly occurs. (See FIG. 4), which makes the laminate 5 flatter than that shown in FIGS. 1 and 3.

Further, in the present embodiment, at least one of the longitudinal direction one end 13 and the longitudinal direction other end 14 of each sheet-shaped member 10 is provided along the longitudinal direction X of the enclosure 6. Specifically, both the one longitudinal end portion 13 and the other longitudinal end portion 14 are respectively bent with respect to the longitudinal midway portion 15 so as to extend substantially parallel to the longitudinal direction X of the enclosure 6.

The sheet-shaped member 10 has a longitudinal length of, for example, about 100 mm or more and 300 mm or less (preferably 150 mm or more and 250 mm or less), and 1 mm or more and 30 mm or less (preferably 3 mm or more and 15 mm or less). It has a length in the lateral direction (direction orthogonal to each of the longitudinal direction X and the thickness direction Z) and is 0.01 mm or more and 3.0 mm or less (preferably 0.1 mm or more and 1.0 mm or less). It has a certain thickness.

The sheet-shaped member 10 has the same longitudinal direction, lateral direction Y, and thickness direction Z of the sealing material composition 1 as the longitudinal direction, lateral direction, and thickness direction. There is.

As shown in each drawing, the envelope body 6 is configured to allow relative movement in the longitudinal direction X of the envelope body 6 while maintaining the stacked state of the adjacent sheet-like members 10 (laminate bodies 5). ing. In the present embodiment, the envelope body 6 has a tubular shape into which the laminated body 5 can be inserted along the longitudinal direction X thereof. Both longitudinal ends of the envelope body 6 are in a released state where both longitudinal ends of the laminate 5 can be exposed.

The envelope body 6 is a mesh-like body having a mesh structure, and is extended in the longitudinal direction X in a state of being substantially in contact with the surface layer of the laminated body 5 surrounded by the envelope body 6. The outer shape of the envelope body 6 surrounding the laminated body 5 substantially forms the outer shape of the sealing material composition 1. The envelope body 6 is configured by using the wire rod 17 knitted by an appropriate knitting method (for example, knitting) or assembled by an appropriate knitting method.

In addition, in each drawing, the enclosure 6 including the wire 17 twisted (twisted) at a predetermined angle with respect to the longitudinal direction X is shown, but the present invention is not limited to this, and the longitudinal direction X is not limited thereto. The enclosure may include a wire rod extending substantially in the same direction. Further, the intervals between the wire rods 17 may be unequal as shown in each figure, or may be substantially equal.

Examples of the wire 17 include a metal wire made of an alloy containing iron as a main component such as a nickel alloy or a stainless wire, a natural resin such as natural rubber, a synthetic resin, a fluororesin such as polytetrafluoroethylene, or the like. Natural or synthetic fibers are used. A metal wire is used for the wire rod 17 in this embodiment. The wire rod 17 is, for example, a round wire having a diameter of 0.01 mm or more and 1 mm or less. It should be noted that the enclosure 6 actually encloses the laminated body 5 which is flattened as compared with FIGS. 1 and 3 so that there is almost no gap between the adjacent sheet-like members 10 as described above. Become.

In such a configuration, the sealing material composition 1 is bent to manufacture the sealing material using the sealing material composition 1, or to convey the sealing material composition 1 while winding it around a round rod-shaped member. When curved by bending, adjacent sheet-like members 10 can be slid in the longitudinal direction X of the enclosure 6 so as to be displaced from each other.

That is, the sealant composition 1 encloses the adjacent sheet-shaped members 10, that is, the sheet-shaped member 10 on one side and the sheet-shaped member 10 on the other side while bending the adjacent sheet-shaped members 10 respectively. It is possible to make relative movement along the longitudinal direction X of. Moreover, in that case, it becomes possible to maintain the stacked state of the adjacent sheet-shaped members 10.

Specifically, as shown in FIG. 4, in the upper surface side (outer peripheral surface side) surface layer portion 8 of the laminated body 5, the longitudinal one end portion 13 is indicated by an arrow while maintaining the laminated state of the plurality of sheet-shaped members 10. It becomes possible to slide as shown by 18, and at the lower surface side (inner peripheral surface side) surface layer portion 9 of the laminate 5, the other longitudinal end portion 14 can be made to slide as shown by arrow 19. ..

Therefore, when an external force is applied to the sealing material composition 1 so as to bend the sealing material composition 1, it is possible to prevent the sealing material composition 1 from having a sharply bent portion. It is possible to prevent any of the sheet-shaped members 10 from breaking. Therefore, it is possible to prevent the occurrence of defects in the sealing material composition 1, which cause a deterioration in performance.

The sealing material composition 1 according to the present invention is not limited to the above embodiment, and for example, each sheet-shaped member 20 as shown in FIG. 5 has a shorter length in the longitudinal direction than each sheet-shaped member 10, and The inclination angle θ2 may be larger than the inclination angle θ1 in the above embodiment. Further, although not shown, each sheet-shaped member 20 may have a longer length in the longitudinal direction than each sheet-shaped member 10 and an inclination angle smaller than the inclination angle Θ1 of the above-described embodiment.

It was confirmed by an experiment on the flexibility of the sealing material composition that the above-mentioned effects can be obtained. The experimental method is as follows.
In this experiment, as the sealing material composition, Example 1 according to the present invention, Example 2 according to the present invention, and Comparative Example 1 having the same structure as the conventional sealing material composition were prepared. A first round bar member and a second round bar member were prepared.

Example 1 has a structure similar to that of the sealing material composition 1. Each of the plurality of sheet-shaped members 10 in the laminated body 5 has a length in the longitudinal direction of about 200 mm, and has a structure in which seven layers are laminated. Further, the plurality of sheet-shaped members 10 are arranged with a shift amount G such that five step portions 11 are formed every 10 cm in the longitudinal direction of the enclosure 6.

Example 2 has a structure similar to that of the sealing material composition as shown in FIG. Each of the plurality of sheet-shaped members 20 in the laminated body 5 has a length in the longitudinal direction of about 100 mm, and has a structure in which seven layers are laminated. Further, the plurality of sheet-shaped members 20 are arranged with a shift amount G such that seven step portions 11 are formed every 10 cm in the longitudinal direction of the enclosure 6.

Comparative Example 1 has the same structure as the conventional sealing material composition as shown in FIG. The plurality of fibrous members 30 are filled in the enclosure 32 so as to be randomly arranged. Further, the plurality of fibrous members 30 are arranged so that no step portion is formed in the vicinity of the enclosure 32 and a large number (wide area) of gaps are formed in the enclosure 32.

The first round bar-shaped member can be wound around the entire circumference of Example 1, Example 2, and Comparative Example 1, and has a diameter of 10 mm. The second round bar-shaped member can be wound around the entire circumference of Example 1, Example 2, and Comparative Example 1, and has a diameter of 30 mm.

Then, Example 1, Example 2, and Comparative Example 1 were wound around each of the first round bar-shaped member and the second round bar-shaped member over substantially the entire circumference while being bent and curved. Then, Example 1, Example 2, and Comparative Example 1 were removed from the first round rod-shaped member and the second round rod-shaped member, respectively, and the states of the sheet-shaped members 10 and 20 and the fibrous member 30 were confirmed.

The result is shown in FIG. 7. That is, in Examples 1 and 2, breakage was not confirmed in any of the plurality of sheet-shaped members 10 and 20 (indicated by ◯ in the figure). On the other hand, in Comparative Example 1, breakage over the entire layer was confirmed at two locations in the longitudinal direction of the enclosure 32 (indicated by x in the figure).

Further, in the present embodiment, since each sheet-shaped member 10 extends in the direction inclined with respect to the longitudinal direction X of the enclosure 6 as described above, the bending action acts on the sealing material composition 1. In this case, the adjacent sheet-shaped members 10 can be slid smoothly. Therefore, the plurality of sheet-shaped members 10 can be made less likely to break.

Further, in the present embodiment, the one longitudinal end portion 13 and the other longitudinal end portion 14 of each sheet-shaped member 10 are provided so as to be along the longitudinal direction X of the surrounding body 6, so these ends are provided. The portions 13 and 14 do not project outward from the mesh portion of the enclosure 6. Therefore, it is possible to prevent the one end portion 13 in the longitudinal direction and the other end portion 14 in the longitudinal direction from being damaged by a collision with an installation or the like located outside.

In view of the above teachings, it should be apparent that the present invention is capable of many modifications and variations. Therefore, it is to be understood that the invention, within the scope of the appended claims, may be practiced otherwise than as described herein.

DESCRIPTION OF SYMBOLS 1 Sealing material composition 5 Laminated body 6 Enclosed body 10 Fibrous member 13 One end part in the longitudinal direction of the fibrous member 14 The other end part in the longitudinal direction of the fibrous member 15 Midway part in the longitudinal direction of the fibrous member

Claims (4)

A stack,
A long envelope surrounding the laminate,
The laminate is
Having a plurality of sheet-shaped members formed into a tape shape by expansive graphite,
The plurality of sheet-shaped members are stacked in a direction intersecting the longitudinal direction of the enclosure,
Wherein among the plurality of sheet-like member, the sheet-like member which adjoin in the stacking direction, the longitudinal direction of the enclosure, deviated so and are relatively movable to each other,
The enclosure is
A sealing material composition that allows relative movement in the longitudinal direction of the enclosure with respect to the plurality of sheet-shaped members while maintaining the stacked state of the adjacent sheet-shaped members. The sheet-shaped member,
A longitudinal direction one end portion, a longitudinal direction other end portion, a longitudinal direction midway portion connecting the longitudinal direction one end portion and the longitudinal direction other end portion,
The sealing material composition according to claim 1 , wherein the one end portion in the longitudinal direction and the other end portion in the longitudinal direction are in contact with the envelope body on opposite sides sandwiching the midway portion in the longitudinal direction. The sealing material composition according to claim 2 , wherein one end in the longitudinal direction and the other end in the longitudinal direction of the sheet-shaped member extend in a direction inclined with respect to the longitudinal direction of the enclosure. The longitudinal midway portion of the sheet-shaped member is provided so as to be inclined with respect to the longitudinal direction of the enclosure,
The sealing material composition according to claim 2 or 3 , wherein at least one of the one end in the longitudinal direction and the other end in the longitudinal direction of the sheet-shaped member is provided along the longitudinal direction of the enclosure.

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