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Yarn

A polytetrafluoroethylene and film technology, applied in the online field, can solve the problems of long production time, long time, core material exposure, etc., and achieve the effects of simple covering structure, good stability and reliability, and easy production

Active Publication Date: 2012-10-17
NIPPON PILLAR PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] That is, since the wire is formed by winding a sheet of PTFE or the like around expanded graphite or a high-strength material that becomes the core (Core), or by laminating PTFE on the surface of the expanded graphite tape, the core material (expanded graphite) is easily exposed
In addition, since the sheet is wound in a spiral shape, it has the disadvantage that it takes a lot of time to manufacture
[0006] In short, the wire formed by the winding (helical winding) method tends to expose the core material easily because a thin sheet such as PTFE is wound around the core material, and requires a lot of production time
In addition, the thread formed by the lamination method has a problem that the core material is exposed at both ends of the sheet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example 〕

[0043] Such as figure 1 , figure 2 As shown, the line Y of the first embodiment is formed by twisting the base material 3, wherein the base material 3 utilizes the PTFE film under the condition that the PTFE film 2 and the expanded graphite sheet 1 are aligned with each other in the length direction 2 formed by surrounding the expanded graphite sheet 1. That is, as will be described later, it becomes a thread (braided thread) formed by enclosing the rounded inner reinforcing expanded graphite sheet 1 with an outer diameter of 2 mm in the PTFE film 2 .

[0044] The expanded graphite flake 1 as the core material is formed by using elongated expanded graphite (internal reinforced expanded graphite), wherein the elongated expanded graphite is equipped with a plurality of reinforcing wires 1h in a parallel state (inner reinforced expanded graphite). An example), and the cross-sectional shape is a flattened rectangle. The expanded graphite sheet 1 is bent and wound so that one e...

no. 2 example

[0049] Such as image 3 As shown, the wire Y of the second embodiment is wrapped in the roll-shaped sheet 1L formed by the expanded graphite sheet 1 through the PTFE film 2, and is wrapped together in the roll 4L unrolled from the stainless steel wire (for example: thick 0.1mm) Stainless steel wire 4 (an example of reinforcement H) as an external reinforcement. That is to say, the wire Y of the first embodiment is also externally reinforced, and the internal and external reinforcement of the reinforced wire 1h(H) as the internal reinforcement and the stainless steel wire 4(H) as the external reinforcement can realize better mechanical properties. Line Y.

[0050] 〔Gland packing〕

[0051] For reference, although the illustration of the gland packing is omitted, the gland packing gathers a plurality (for example, eight) of the wires Y described above (first and second embodiments) around the core material (also There may be no core material) and then twisting or braiding (8-j...

no. 3 example

[0055] Such as Figure 4 , Figure 5 As shown, the line Y of the third embodiment is formed by enclosing the expanded graphite sheet 1 with the rolled PTFE film 2 in a state where the PTFE film 2 and the expanded graphite sheet 1 are aligned in the longitudinal direction. That is, as will be described later, it is a thread (braided thread) formed by wrapping a rounded inner reinforcing expanded graphite sheet 1 with an outer diameter of 2 mm with a PTFE film 2 .

[0056] The expanded graphite sheet 1 as the core material is formed by using a strip-shaped expanded graphite (internal reinforced expanded graphite), wherein the long strip-shaped expanded graphite (internal reinforced expanded graphite) is equipped with a plurality of parallel reinforcements. Line 1h (an example of reinforcement H), and the cross-sectional shape is a flattened rectangle. The expanded graphite sheet 1 is simply bent in the longitudinal direction, and rolled inward so that one end 1 a of the expand...

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Abstract

A yarn which is configured by using expanded graphite and PTEE is provided while improving the yarn so that the expanded graphite functioning as a core member is not exposed and it can be simply produced. Therefore, a yarn is formed by: forming a base member 3 configured by enveloping an expanded graphite sheet member 1 with a PTEE film 2, in a state where the PTEE film 2 and the expanded graphite sheet member 1 are aligned with each other in longitudinal direction; and twisting the base member 3. The base member 3 has an approximately circular sectional shape, and is configured by enveloping the expanded graphite sheet member 1 having a rounded sectional shape with the PTEE film 2 which is rounded in a pipe-like shape.

Description

[0001] This application is a divisional application of a patent application with the application number 200980135509.4, the application date being August 10, 2009, and the invention name being "thread". technical field [0002] The present invention relates to a wire suitable for gland packing used as a sealing part of fluid equipment such as pumps and valves. Background technique [0003] Conventionally, a technique using expanded graphite is known in the prior art regarding gland packings used in shaft seals of fluid equipment such as pumps and valves, and wires (braided wires) used in gland packings. Furthermore, Patent Document 1 and Patent Document 2 disclose structures formed using not only expanded graphite but also PTFE (polytetrafluoroethylene). [0004] That is, by forming a wire having high tensile strength and toughness while maintaining the original high compression recovery and run-in properties of expanded graphite, a filler capable of exhibiting high sealing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D02G3/02C09K3/10F16J15/22
CPCD10B2321/042D10B2505/06D02G3/447F16J15/22D02G3/38D10B2101/12D02G3/04D02G3/06
Inventor 上田隆久池田孝杉田克纪藤原优田边裕树井上广大
Owner NIPPON PILLAR PACKING CO LTD
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