JPS6319549B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a packing material whose constituent material is tetrafluoroethylene resin.

[Conventional technology]

A well-known packing material of this type is one in which only tetrafluoroethylene resin fibers, which are made into fibers by emulsion spinning or the like, are suitably knitted into a string shape.

[Problem that the invention seeks to solve]

However, although tetrafluoroethylene resin fibers have excellent heat resistance, they are essentially thermoplastic, so when used as a component of packing material, they are easily deformed and have some drawbacks in terms of sealing performance. be. It also has poor wear resistance. Therefore, it was possible to maintain its function as a packing material within an extremely limited range.

The present invention was made in view of these circumstances, and covers the weaknesses of tetrafluoroethylene resin fibers,
The object of the present invention is to provide a packing material for shaft sealing that has excellent properties as a packing.

[Means for solving problems]

In order to cover the weaknesses of the tetrafluoroethylene resin fiber and improve its function as a packing, the present invention particularly proposes adding a fiber material with heat resistance as a reinforcing material to the tetrafluoroethylene resin fiber. This is a proposal. Furthermore, as a reinforcing material, it is generally considered to use asbestos fibers, but as is well known, the amount of asbestos used is restricted from the perspective of environmental hygiene, and due to industrial circumstances, its use will eventually become impossible. In view of this, it is proposed to use phenolic resin fibers as a reinforcing material.

That is, the packing material of the present invention contains 5% by weight of short fibers made of phenolic resin fibers in addition to 85% by weight of short fibers made of unmelted tetrafluoroethylene polymer fibers.
This product is characterized by uniformly adding 10% by weight of wax and 10% by weight of wax as a lubricant, which is then integrated into a thin plate by compression molding.

The length of each fiber is preferably relatively short, 10 mm.
A length of ~20 mm is preferred. In other words, the fiber length is relatively short so that the main unmelted tetrafluoroethylene polymer fiber and the phenolic resin fiber added thereto are uniformly blended, and after compression molding, these fibers are suitable. This is to facilitate uniform blending and integration.

Suitable waxes include wood wax, beeswax, petroleum paraffin, and the like. By impregnating wax, which is an oil binder, the wear resistance of the packing material is improved.
Improves lubricity.

The shape of the packing material, that is, the thin plate shape obtained by compression molding, does not necessarily have to match the shape of the packing material that will ultimately fit and seal the shaft of each device. That is, regardless of its shape, the packing material of the present invention can be applied to various devices or similar devices with different dimensions by appropriately winding it or tearing it. General-purpose packing that has the characteristics of an intermediate product (generally referred to as "amorphous packing")
It can also be used as

〔effect〕

According to the present invention, since the main fibers are short fibers made of unmelted tetrafluoroethylene polymer fibers, and short fibers made of phenolic resin fibers are added as a reinforcing material to the main fibers, the final packing is formed. When this is done, the elasticity and chemical resistance (especially acid resistance) can be improved more characteristically, and a packing material with excellent heat resistance and strength retention can be obtained.

Furthermore, by impregnating wax such as wood wax as a lubricant, wear resistance and lubricant properties are improved, and when the product is made into a package, it has a good overall cohesiveness, which increases the product value in terms of appearance. .

Therefore, the shaft sealing packing material of the present invention can be applied to harsher conditions than conventional packing materials, and the range of application as a packing material is greatly expanded. In particular, it is integrally compressed into a thin plate shape and can be used as a versatile amorphous packing, so it can be used not only for general heavy industrial equipment, but also for small valves in district heating and cooling systems, and for household piping. It can be applied to fields where easy replacement and ease of use are required, and it can also be used as a substitute for asbestos-phobic packing materials, making a great contribution to industry.

Claims (1)

[Claims] 1. Add 5% by weight of short fibers made of phenolic resin fibers to 85% by weight of short fibers of unmelted tetrafluoroethylene polymer fibers, which are the main fiber, and further add 10% by weight of wax as a lubricant. A packing material for shaft sealing consisting mainly of short fibers, which is integrated into a thin plate shape by compression molding.