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Gland packing

A gland and fiber technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc., can solve the problems of low tensile strength and easy breakage, and achieve the effects of less leakage, good adaptability and less stress relaxation

Active Publication Date: 2015-03-18
NIPPON PILLAR PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Expanded graphite has the following advantages: softness, excellent chemical resistance, high adhesion, and high temperature resistance; however, it has the disadvantages of very small tensile strength, brittleness and easy breakage

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0042] The gland packing of the first embodiment is characterized in that it is obtained by twisting or braiding a single or a plurality of twisted (twisting) fibers having an LOI of 21 to 30. That is, the value e of the LOI of the fiber satisfies the condition of 21≦e≦30.

[0043] Examples of fibers whose LOI value e satisfies the condition of 21≦e≦30 include acrylic fibers, acrylic fibers, viscose, cellulose, hemp, cotton, and polyvinyl alcohol.

[0044] Acrylic fibers include those formed from polymers containing more than 50% by weight of acrylonitrile. The polymer may be a copolymer of acrylonitrile and an unsaturated monomer copolymerizable with acrylonitrile as long as it contains 50% by weight or more of acrylonitrile.

[0045] Examples of unsaturated monomers that can be copolymerized with acrylonitrile include: methyl acrylate, ethyl acrylate, isopropyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, acrylic acid Acrylates such as hydrox...

Embodiment

[0077] The fiber s used in the thread Y of the gland packing g is an acrylic fiber or an acrylic fiber, and the fiber diameter thereof is 18 (14 to 20) μm. The LOI of the fiber used was measured in accordance with JIS (Japanese Industrial Standards) K 7201-2 "Plastics - Test method for flammability based on oxygen index - Part 2: Test at room temperature".

[0078] First, a plurality of the aforementioned fibers are twisted to produce a yarn Y. Next, using a knitting machine (not shown), weave through 8 strands of square knitting (8打ち角编み) using 8 threads (braiding yarns) Y, or 16 strands of circular knitting using 16 threads Y (16打ち丸编み) ) to make strip-shaped gland packing g, but the twisted tape can be used to make gland packing.

[0079] Then, using a 2-point roll (2-point roll) or a 4-point roll (4-point roll), the strip-shaped packing is made into a square strip-shaped gland packing g with a length of 14.5 mm on one side and a square section. The gland packing g is then ...

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Abstract

A gland packing having required characteristics is obtained by finding relationships between required characteristics and the value of the limiting oxygen index, and adequately defining the level of the required characteristics. The gland packing is configured by twisting or braiding a single or plurality of yarns that are formed by twisting fibers having a limiting oxygen index (LOI) of 21 to 30, preferably 22 to 26. The fibers contain fibers in which a flat ratio is defined as 1.1 to 2, the flat ratio being a value obtained by dividing the maximum value of an interval between two parallel straight line in a state where a section of each of the fibers is interposed between the straight lines, by the minimum value. The fibers contain fibers in each of which a sectional shape has one or more recesses 1 having a depth h of 0.4 μm or more.

Description

technical field [0001] The invention relates to a gland packing used as a sealing part of fluid equipment such as pumps and valves. Background technique [0002] As the prior art related to gland packings used in shaft seals of fluid equipment such as pumps and valves, or the wires (braided wires) used therein, generally, a technology using expanded graphite as disclosed in Patent Document 1 is known. Expanded graphite has the following advantages: excellent flexibility, chemical resistance, high adhesion, and high temperature resistance; however, it has the disadvantages of very low tensile strength, brittleness and easy breakage. [0003] Accordingly, threads formed of strong and abrasion-resistant fibers are made, or these threads are twisted or braided to form ribbon-shaped gland packings. For example, techniques using acrylic fibers disclosed in Patent Document 2 and Patent Document 3 are known. As these organic fibers, other than acrylic or acrylic fibers, various fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/16
CPCF16J15/181F16J15/22F16J15/16
Inventor 林洋树川崎贵士片冈幸一
Owner NIPPON PILLAR PACKING CO LTD
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