JPS58207577A - Grand packing - Google Patents

Abstract

PURPOSE:To eliminate the problem of silicosis and as well to make the sealability of a grand packing satisfactory, by using the fiber material which is made such that a paper-like member which is obtained by making natural or synthetic fibers fibrillated and by subjecting the fibers to a paper making process, is shredded into taped papers, and then the taped papers are twisted together for forming the above-mentioned fiber material. CONSTITUTION:A paper-like member 1 is made by beating fibers and by subjecting the same to a paper making process. This paper-like member 1 is shredded into long and narrow tapes which are then twisted. The thus twisted tapes, three in number, are further twisted together for obtaining combined and twisted yarns 3 which are then knitted together for finally producing a grand packing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gland packing with good sealing properties.

Conventionally, asbestos fibers have been mainly used as ground packing.

This is because the #C fibers of asbestos fibers are thin and flexible, and have good oil retention properties, so they have good sealing properties when used as packing.

However, asbestos has the problem of being susceptible to silica formation, so it is difficult to use natural or synthetic fibers other than asbestos fibers. It is being considered to use at fiber as a raw material.

However, in these fibers 1, the diameter of the asbestos monofite is 0.02 to 0.03 (unit: μ - the same below).
While it is thin, wood s10~45, linen 25, wool 20~
25, the carbon fiber was very thick, measuring 7 to 2 degrees, and therefore had problems with flexibility and oil retention, and had insufficient sealing performance.

The present invention has been made in view of the current situation, and an object of the present invention is to provide a gland packing metal with good sealing performance and no silicosis stoichiometry because no asbestos fibers are used.

In order to achieve the above object, the present invention uses a fiber material obtained by fibrillating natural fibers or synthetic fibers, cutting the paper into tape shapes, and twisting the tape. It is said to be the best.

The fibers used may be of any type as long as they can be fibrillated, such as cellulose fibers such as cotton and hemp;
Examples include synthetic fibers such as polyacrylic tri/I/lh fibers and aromatic polyamide fibers.

Fibrillation is the same as beating in the papermaking process; b)
This is done using a paper beater.

Paper is made using the usual paper making method, but if necessary, a solid lubricant (graphite, PTFE (tetrafluoroethylene resin), and wax gold is mixed) is used to make the paper.

Incidentally, if there is a problem with the strength of the yarn during subsequent shredding into a tape shape or twisting, the total strength of the yarn can be increased by partially cutting the unbeaten fibers.

In paper making, it is possible to make paper by mixing fibrous materials such as potassium titanate and various whiskers, which have very thin fibers but short lengths. (Potassium titanate, fiber diameter 0.
1~0.16μ ship, length 1~10m surface 7 compensation 7~LOt
pt/gg silicon material, diameter 0.5μ, length Q, 2
~0-3 m) The ground packkin of this invention has its W
T-fibers are refined.

The specific surface measurement results, which typically represent the fineness of fibers, are as follows: Ordinary wood - 〇, 7 (unit - 7g, same hereinafter) Wool: 0.96, Glass fiber: 0.98, Aromatic polyamide. Visceral fibers have a fineness of 0.2 to 0.8, whereas the aromatic polyamide fibers of the present invention have a fineness of 8 to 10, which is close to 13 to 22 of asbestos TA fibers.

Therefore, the gland packing of the present invention is flexible, has good oil retention properties, and has good sealing properties.

Next, the manufacturing process of this ground packing will be explained.

In the figure $1, 1 is a paper-like material made of 2# fiber by completely beating and paper making.

This paper-like material 1 is shredded to make a long and thin tape 2, which is then burnt and twisted together to make a composite thread 3.
- Assemble the castle and make all 4 gland packings.

This ground packing 4 uses selected lubricants (cylinder oil, machine oil, fluid buffing fin) and solid lubricants (PTFE, graphite, mica, molybdenum 2kL, wax) that are normally used for packing. n
ing.

Next, FIG. 2 shows the sealing characteristics of a gland packing using the gland packing of the present invention and a wired fiber.

In Fig. 2, the current product refers to the product made using ordinary aromatic polyamide (fiber surface area 0.2 to 0.8 m'/g)2, and the product of the present invention refers to the product made by beating the aromatic polyamide. The following (surface area 8-10 m'/g)' (il - used to refer to.

The fluid used is water, and the fluid pressure is I Kg/-G.0 As is clear from Figure 2, the amount of a liquid in the same tightening is approximately 1150 of the normal amount of fiber when all fibers are used. This shows that the characteristics have been significantly improved.

As mentioned above, the ground packing of the present invention is made of a fiber material made by turning all the natural fibers into fibrils, cutting them into paper-like body tape shapes obtained by papermaking, and twisting them. According to the present invention, the fibers are fine, flexible, have good oil retention properties, and have good seal/l'# properties.

[Brief explanation of the drawing]

Figure 1 shows the ground packing t-? of this invention. Schematic diagram showing the manufacturing process. The second factor is a diagram showing sealing characteristics.

Claims (1)

[Claims] 1. A ground packkin made of fiber material made by fibrillating natural fibers or synthetic fibers, making paper, shredding them into Tokuyu paper-like gold tape shapes, and twisting the resulting fibers into threads.