Packing material and gland packing using the material and process for packing material

Abstract

6 The present invention relates to the versatile packing material that has enough lubricating property, durability and sealing ability even if they are used under high PV value (speed of rotating shaft is more than 25 m / sec) to a shaft seal part of a fluid machinery where the rotating shaft rotates with high speed or under very high pressure to a seal of shuttle slide part of fluid machinery, and are high quality in durability, withstand pressure ability, heat resistance, lubricating property (low torque ability etc.), chemical resistance, sealing ability, low-emission ability and reducing production cost etc., further prevent electric corrosion to contact metal such as valve rod; packing material, wherein at least any one of expansive graphite thread, carbonized fiber thread, carbon fiber thread, aramid resin fiber thread, phenol resin fiber thread, glass fiber thread, soogee, asbestos fiber thread and bundle of sprit carbon fiber is selected as base material, and in twisted periphery of the base material, a tape made of polytetrafluoro-ethylene is winded.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to packing material and gland packing used the material and process for packing material, more detail, the present invention relates to versatile packing material and gland packing used the material and process for packing material, which have enough lubricating property, durability and sealing ability even if they are used under high PV value (speed of rotating shaft is more than 25 m / sec) to a shaft seal part of a fluid machinery where the rotating shaft rotates with high speed or under very high pressure to a seal of shuttle slide part of fluid machinery, and are high quality in durability, withstand pressure ability, heat resistance, lubricating property (low torque ability etc.), chemical resistance, sealing ability, low-emission ability and reducing production cost etc., further prevent electric corrosion to contact metal such as valve rod. [0003] 2. Description of the Related Art...

AI Technical Summary

Benefits of technology

The present invention provides a versatile packing material and gland packing that have excellent lubricating properties, durability, sealing ability, and can withstand high pressure and high-speed rotation. The packing material is made using a base material, such as expansive graphite thread, carbonized fiber thread, or aramid resin thread, and is twisted or braided to improve its performance. The packing material can be used in high-speed or high-pressure fluid machinery, and can prevent electric corrosion. The gland packing is made using the braided packing material, which has a pressed shape and can be further impregnated with antifriction materials, such as silicon oil or wax. The invention also provides a process for making the packing material.

Problems solved by technology

To compensate these defects, some packing which are comprised above-mentioned material are involved PTFE, but solid content of PTFE easily exfoliates from these packing which are involved PTFE in using, as a result, there are problems that stress relaxation occurs in early stage in using, hence life of packing becomes short, and not only wasteful but also operating torque of rotating shaft becomes high, therefore, abrasion of the rotating shaft becomes earlier, and leaking from sealing part increases.

These conventional packing can exercise relatively well in sealing ability or durability as seal member in betweenness in rest object, but as-mentioned above, they cannot have exercised enough durability, lubricating property and sealing ability as seal member which is used in relatively moving object under high PV value over speed of rotating shaft is more than 25 m / sec, especially in descaling pump, or seal member for plunger of reciprocating pump.

Further, asbestos used in conventionally is highly desirable in performance, but it causes environmental pollution issue such as pneumoconiosis etc., therefore, it will be wholly prohibited of using.

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