Abstract: A strip-like expanded graphite (3) is disposed on one face of a sheet-like reinforcing member (20) configured by a fibrous material (2) to form a strip-like base member (4). The base member (4) is stranded to be formed as a cord-like member (40). The outside of the cord-like member (40) is covered by a portion of the strip-like expanded graphite (3), and the whole reinforcing member (20) and the remaining portion of the strip-like expanded graphite (3) are involved in the cord-like member (40). A large number of openings (20A) are formed in the reinforcing member (20). The strip-like expanded graphite (3) faces the openings (20A). The strip-like expanded graphite (3) is engaged with the openings (20A), whereby the coupling force between the strip-like expanded graphite (3) and the reinforcing member (20) is enhanced. The gland packing material (1) is provided by the fibrous material with high tensile strength, and easily subjected to a braiding or twisting process.

Abstract: A reinforcing member (20) configured by a fibrous material (2) is disposed at least on one face of a strip-like expanded graphite (3) to form a strip-like base member (4). The base member (4) is stranded to be formed as a cord-like member (40). At this time, one side end edge of the base member (4) is placed on the outer peripheral surface of the cord-like member (40), and, in the side end edge, the strip-like expanded graphite (3) is more elongated in the width direction than the reinforcing member (20). The stranding of the base member (4) is applied while the strip-like expanded graphite (3) which is elongated in the width direction is placed on the inner side, and the reinforcing member (20) which is short in the width direction is placed on the outer side. According to the configuration, both the reinforcing member (20) and the strip-like expanded graphite (3) are placed in a spiral manner to be alternately arranged in the axial direction on the outer peripheral surface of the cord-like member (40).

Abstract: In a braiding yarn made of expanded graphite 1, a reinforcing wire member 3 made of a stainless steel wire which is easily plastically deformed, and having a diameter of 0.05 to 0.2 mm is spirally wound around the outer periphery of a twisted expanded graphite base member 2 having a width of 3 mm and a thickness of 0.38 mm, at a narrow pitch P of 0.5 to 5 mm without slack. Alternatively, the reinforcing wire member is wound so as to be embedded in the inner side of and along an edge 4 of an expanded graphite tape which is spirally exposed from the outer surface of the expanded graphite base member 2.

Abstract: A packing is disclosed for hermetically sealing a member. The packing in accordance with the present invention comprises braiding yarns each of which includes a plurality of longitudinally arranged reinforcing fiber yarns and expanded graphite integrally bonded to at least one side of the reinforcing fiber yarns with adhesive, so that the braiding yarns are provided with excellent sealing properties and strong tensile strength and toughness. A plurality of such braiding yarns may be put together to form a core member. The core member may be covered, at the outer periphery thereof, with a braided body of the braiding yarns. A plurality of such braiding yarns as put together may be braided (square-knitted). Alternatively, a plurality of such braiding yarns as put together may be twisted. Thus, packing having a free length may be obtained. The packing thus obtained may be used as cut, at a site, to a predetermined length according to the size of the object member to be sealed.

Abstract: The present invention relates to an annular sliding fluoroplastics member (1) which is requested to have good mechanical properties, resistance to abrasion and wear, thermal conductivity, heat resistance, and the like, and also to a method of producing such an annular sliding fluoroplastics member (1). The annular sliding fluoroplastics member (1) of the invention has a composite structure which mainly consists of fluorine plastics and short fibers (2), and 20 or more wt. % of short fibers by weight of a total amount of the short fibers (2) are oriented in a direction along which a burden of a load is large. According to this configuration, the buckling resistance and the pressure resistance are enhanced. A member having a high buckling resistance can be used in a thrust slide bearing or a thrust washer in which a large press load is applied in the axial direction, and a member having a high pressure resistance can be used in a radial slide bearing in which a large press load is applied in a radial direction.

Abstract: The present invention relates to a structural material for a gland packing, which can be used favorably as a gland packing in a spiral or annular form, and which exhibits extremely good sealing performance. The structural material for a gland packing is a braided cord 8 comprising a plurality of knitting yarns braided in a spiral. In this braided cord 8, elastic yarns 51c that have higher elasticity than the knitting yarns and extend in the lengthwise direction of the braided cord 8 without being intertwined with the knitting yarns are disposed in a penetrating fashion in at least a braid layer portion 8A that is on an outer peripheral surface 8b side of a reference plane X-X that passes through the cross sectional center 80 of the braided cord 8 and is parallel to the inner and outer peripheral surfaces 8b and 8c of the braided cord 8. The plurality of elastic yarns 51c are disposed in a cross section of the braided cord 8 in an aligned state parallel to the outer peripheral surface 8b of the braided cord 8.

Abstract: The present invention relates to a braiding yarn made of expanded graphite for a gland packing which is to be used in a shaft seal part of a fluid apparatus or the like. In the braiding yarn made of expanded graphite of the invention, an expanded graphite tape of a predetermined width is folded into a valley fold in the longitudinal direction, both end portions in the width direction of the expanded graphite tape are bent so as to be directed toward the inner side of the width direction of the expanded graphite tape, and the outer periphery of the tape is covered by a reinforcing member configured by a braided body of stainless steel wires. The expanded graphite tape may be twisted. Reinforcing fibers may be embedded in the expanded graphite tape. Part of expanded graphite particles on the side of the surface of the expanded graphite tape may be removed away.

Abstract: The present invention relates to a filler material (1) for a spiral wound gasket, and to a spiral wound gasket (W) using the fillermaterial (1). The fillermaterial (1) and the spiral wound gasket (W) according to the invention can be applied to various pipe joints and a joint portions of fluid equipments for sealing fluid such as liquid and gaseous body. The filler material (1) of the invention is obtained by removing, by blast treatment, a high density portion on a front surface (2A) or a back surface (2B) of a tape-like expansive graphite tape (2) formed by integrally pressurizing expanded graphite particles. The spiral wound gasket (W) is obtained by overlapping the filler material (1) and a hoop material (5) made of metal band plate with each other and winding them in the form of a spiral. The spiral wound gasket (W) is superior in productivity, and in flexibility, bending property and pliability, and exhibit excellent sealing property even at a low surface pressure.

Abstract: The present invention provides a gland packing in which impairment of the sealing performance due to cracks that unwillingly occur in an end portion in the width direction of an expanded graphite tape of a braiding yarn in the gland packing can be suppressed. In gland packings 1, 2, braiding yarns include braiding yarns 10A in each of which an expanded graphite tape 30 is bent so as to contract in the width direction, and both end portions 31 in the width direction of the bent expanded graphite tape 30 are folded back, or braiding yarns 20A in each of which at least an outer end portion 31′ in the width direction of a twisted expanded graphite tape 30 is folded back.

Abstract: The present invention provides a gland packing in which impairment of the sealing performance due to cracks that unwillingly occur in an end portion in the width direction of an expanded graphite tape of a braiding yarn in the gland packing can be suppressed. In gland packings 1, 2, braiding yarns include braiding yarns 10A in each of which an expanded graphite tape 30 is bent so as to contract in the width direction, and both end portions 31 in the width direction of the bent expanded graphite tape 30 are folded back, or braiding yarns 20A in each of which at least an outer end portion 31′ in the width direction of a twisted expanded graphite tape 30 is folded back.

Abstract: The present invention relates to a braiding yarn made of expanded graphite for a gland packing which is to be used in a shaft seal part of a fluid apparatus or the like. In the braiding yarn made of expanded graphite of the invention, an expanded graphite tape (2) of a predetermined width is folded into a valley fold in the longitudinal direction, both end portions (2a, 2b) in the width direction of the expanded graphite tape (2) are bent so as to be directed toward the inner side of the width direction of the expanded graphite tape (2), and the outer periphery of the tape is covered by a reinforcing member (3) configured by a braided body of stainless steel wires. The expanded graphite tape (2) may be twisted. Reinforcing fibers may be embedded in the expanded graphite tape (2). Part of expanded graphite particles on the side of the surface of the expanded graphite tape (2) may be removed away.

Abstract: An expanded graphite knitting yarn according to the present invention is covered or bound and covered with a reinforcing material made of a braided body such as stainless steel line members, before an outer periphery of an expanded graphite tape having a predetermined width, which has been subjected to a twisting process, is braided. Therefore, an amount of the expanded graphite particles exfoliated from ends of the expanded graphite tape in the twisting process can be significantly reduced. Moreover, this can prevent the expanded graphite particles from being exfoliated from the end of the expanded graphite tape in a braiding process. Furthermore, the plural expanded graphite knitting yarns are put together and subjected to either braiding or twisting process, thereby forming a gland packing. This can enhance a sealing property and a pressure resistance property of the gland packing.

Abstract: A shaft seal apparatus that exhibits a good and reliable sealing performance, even when a rotating shaft undergoes axial vibration, eccentric revolution, or the like. This shaft seal apparatus has gland packings (2) stuffed in a sealed space (10) formed between a rotating shaft (9) and a stuffing box (1), with gland packings (2) pressed between a first packing gland (3) on a sealed liquid region side (7) and a second packing gland (4) on an atmospheric region side (8). The first packing gland (3) is fixed to a rotary equipment body (6) and the second packing gland (4) is to the stuffing box (1). A screw bolt (15) extending in the axial direction of the rotating shaft (9) is anchored to the first packing gland (3). The stuffing box (1) is provided with a through hole (16) larger than the screw bolt (15) in the flange (1a). The screw bolt (15) running through the through hole (16) has a tightening nut (17) thereon at a place which is out of and backward of the hole (16).

Abstract: The present invention relates to a gland packing which is made of a material configured by laminating an expanded graphite tape into a spiral shape by winding. The gland packing can prevent penetration leakage through minute gaps existing in the laminated parts, from occurring, can be sufficiently deformed so as to exhibit sure sealing properties even at a low tightening force, and has properties which result in a small amount of wear so as to ensure high sealing properties, so that high sealing performance can be maintained for a long term. In the gland packing, circumferentially projected parts are disposed on end faces of a die mold packing part made of an expanded graphite tape laminated into a spiral shape so as to be integrated with the part.

Abstract: The present invention relates to a sealing material made of expanded graphite and to a method of producing it. In the sealing material made of expanded graphite of the present invention, a surface layer portion of an expanded graphite base material in which expanded graphite particles are pressurized is subjected to a blast process or the like, whereby the weight of the expanded graphite base material is reduced by a range of 0.5 to 3%, so that the diffraction peak of an X-ray diffraction of the exposed surface layer portion of the expanded graphite base material is in a range of 26.52.degree. to 26.48.degree.. In such a sealing material made of expanded graphite, the elongation rate and the tensile strength are improved, and also flexibility is remarkably improved. As a result, the product application range is extended and product productivity are improved.

Abstract: The heat-resisting material according to the present invention comprises a fiber aggregate containing crystalline alumina short fibers and formed in a continuous length and an inflammable sheathing for maintaining the shape of the fiber aggregate in a compressed state. The expansion percentage of the fiber aggregate after burn-off of the sheathing is not less than 10% by volume based on the volume of fiber aggregate in a compressed state. This heat-resisting material can be worked into various forms of product of the heat-resisting material such as rope, square bar, sheet, etc., according to the purpose of use. The present heat-resisting material is provided in continuously long products, has high heat resistance and restoring property, and can be easily applied to the openings or spaces ranged continuously in the longitudinal direction, such as the boundaries between the blocks of the heat-resisting material and joints.

Abstract: The composite gasket of the present invention has improved various properties which are different depending on use conditions, while ensuring sealing properties, by combining a seal material which is selected in accordance with the properties of certain sheet-like seal materials in a substrate. The composite gasket is configured by forming a plurality of slits in a surface of the sheet-like seal materials the slits extending in a thickness direction of the materials, and loading a seal material composed of a substance which is different from a material constituting the sheet-like seal material into the slits and the surface of the seal material.

Abstract: A sanitary-pipe gasket includes an annular disk portion of predetermined thickness, and a projecting portion which is provided concentrically with the annular disk portion on each of the upper and lower surfaces of the annular disk portion. The annular disk portion and the projecting portion of the sanitary-pipe gasket are integrally formed of porous PTFE such that the density of the annular portion ranges from 1.0 to 1.9 g/cm.sup.3 and the density of the projecting portion ranges from 0.3 to 1.8 g/cm.sup.3. The gasket is produced by disposing a porous PTFE sheet of 0.3 to 1.4 g/cm.sup.3 density and 1 to 10 mm thickness in a mold, and applying pressure perpendicular to the sheet at room temperature or with heating.

Abstract: The present invention relates to a gland packing which is made of a material configured by laminating an expanded graphite tape into a spiral shape by winding. The gland packing can prevent penetration leak-age through minute gaps existing in the laminated parts, from occurring, can be sufficiently deformed so as to exhibit sure sealing properties even at a low tightening force, and has properties which result in a small amount of wear so as to ensure high sealing properties, so that high sealing performance can be maintained for a long term. In the gland packing, circumferentially projected parts are disposed on end faces of a die mold packing part made of an expanded graphite tape laminated into a spiral shape so as to be integrated with the part.

Abstract: An expanded graphite sealing material is provided in which the adaptability of the principal face of an expanded graphite base member is improved, the bonding strength to a coating layer and the like can be increased, and the sealing properties can be enhanced. A method of producing such a sealing material, and a gasket sheet using the sealing material are also of concern. On at least a portion of a principal face of the expanded graphite base member in which expanded graphite particles are pressurized and integrated together, opened thin-leaf graphite portions are formed. The principal face of the expanded graphite base member having the thin-leaf graphite portions can be impregnated with a sealing member such as PTFE or covered with a coating layer. As the form of the sealing material, a sheet, a press-molded product, a fabric, a string, or a braided article can be adopted.