JPH062231A - Yarn guide and its production - Google Patents

Abstract

PURPOSE:To eliminate the damage to yarn in using a yarn guide by providing the yarn guide without any micropore. CONSTITUTION:A molding of alumina in the objective yarn guide 1 passing through forming and drying steps is burned in a hydrogen atmosphere or burned by a hot isostatic press to produce the yarn guide 1 of alumina ceramics without any micropore. In its use for textile machinery, the friction of the yarn guide 1 with yarn is reduced to eliminate the damage to the yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn path used in all textile machines such as yarn making, spinning, weaving machines and knitting machines, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, yarn paths used in textile machines such as spinning machines and knitting machines are made of metal or ceramics.

The surface of the metal yarn path is chromium-plated, but the plated layer is worn out by use, and the rough metal surface of the thread path itself is exposed, whereby the thread and the thread path are brought into sliding contact with each other. It had the drawback of rubbing, rubbing, and abrasion, damage, and breakage of the yarn.

In a ceramic yarn path, the ceramic itself is dense but has fine holes of several microns to several tens of microns. Therefore, the fine holes and the yarn come into sliding contact with each other to cause friction and abrasion, Had the drawback of being worn, damaged or broken.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, the yarn path is made of ceramics having no fine holes so that damage to the thread due to friction and rubbing between the thread path and the thread is eliminated when the textile machine is used. It is intended to provide a road and a manufacturing method thereof.

[0006]

The present invention is based on the above-mentioned prior art, and the yarn is damaged by friction and rubbing between the yarn path and the yarn,
In view of the problem of breakage, by firing an alumina yarn path molded body in a hydrogen atmosphere or by hot isostatic pressing, a yarn path made of ceramics without micropores is produced, and the above-mentioned drawbacks are solved. It is a spoiler.

[0007]

In the present invention, the alumina molded body that has undergone the molding and drying steps is fired in a hydrogen atmosphere or a hot isostatic press to produce a ceramic yarn path without micropores. , The material prevents the yarn from being damaged.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a yarn path obtained by the method for producing a yarn path according to the present invention. It is used for all textile machines such as knitting machines, and guides and guides threads and yarns. It guides with a roller-like peripheral surface as shown in FIG. There are various shapes such as things.

The yarn path 1 is an alumina ceramics without micropores, and the raw material is high-purity alumina (99.8% by weight after sintering)
Of fine powder of dry or wet, pressure, extrusion or injection,
A molded body obtained by sequentially performing a molding process such as casting and a drying process is sintered into alumina ceramics having no micropores in the following manufacturing process.

The molded body is put into a muffle furnace,
After that, the furnace is filled with an inert gas, and then the hydrogen gas is replaced and filled to form a hydrogen atmosphere in the furnace.
Bake at 850 ° C.

Another example of firing is a sintering method using a hot isostatic press (HIP), which is a HIP device comprising a portion for compressing gas, a high-pressure container containing a heating portion, and a temperature / pressure control portion. In, in the high-pressure container is charged the molded body vacuum-sealed in a capsule made of silica glass, gas such as argon (Ar) is introduced into the high-pressure container,
High temperature (1500 to 1800 ℃) High pressure (0.5 to 2t)
Sinter under.

In the hot isostatic pressing firing method, a pre-sintered body (sintered body having a theoretical density of 93% or more) pre-sintered to a state without openings is prepared. Direct (without capsule) hot isostatic pressing removes fine pore defects in the yarn path 1 (sintered body), so that the density can be further increased.

As shown in FIG. 2, the structure of the yarn path 1 obtained as described above is transformed into alumina ceramics having no fine holes, and the surface of the yarn path 1 is then polished to obtain fine holes. There is no texture on the surface, and the openings on the surface of the yarn path 1 are removed to achieve lubrication.

When it is used in a textile machine,
The roller 1 or the yarn path 1 provided with a thread guide hole guides and guides the thread and the thread, respectively, and at this time, the thread path and the thread come into sliding contact with each other.
Since the surface of the yarn path 1 is smooth, damage to the yarn due to friction and rubbing is eliminated.

[0015]

In summary, according to the present invention, the alumina molded body that has undergone the molding and drying steps is fired in a hydrogen atmosphere or by hot isostatic pressing. Therefore, the yarn path 1 obtained by this manufacturing method is It can be transformed into alumina ceramics that has a high-density structure with no micropores. When this yarn path 1 is used in a textile machine, the yarn path 1 is not porous like conventional yarn paths, so friction and abrasion By doing so, it is possible to eliminate the damage and breakage of the yarn and the thread, and the practical effect thereof is extremely great.

[Brief description of drawings]

FIG. 1 is a perspective view of a yarn path obtained by a yarn path manufacturing method according to the present invention.

FIG. 2 is a diagram showing the organization of FIG.

[Explanation of symbols]

 1 thread road

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[Procedure amendment]

[Submission date] June 4, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Another example of firing is a sintering method using a hot isostatic press (HIP), which is a HIP device comprising a gas compression part, a high-pressure container containing a heating part, and a temperature / pressure control part. In, in the high-pressure container is charged the molded body vacuum sealed in a capsule made of silica glass, introducing a gas such as argon (Ar) into the high-pressure container,
High temperature (1500 to 1800 ℃) High pressure (0.5 to 2)
t) Sinter under. In the above HIP processing conditions,
A wide range can be set, that is, the temperature during sintering
If you keep the temperature higher, you can set the pressure lower, and conversely
If you keep the pressure higher, you can set the temperature lower.
Temperature is 1300 to 1900 ° C, pressure is 0.01 to 2
It can be sintered even under the condition of high temperature and high pressure of t.

Claims (3)

[Claims] 1. A yarn path comprising an alumina ceramic having no fine pores. 2. A method for producing a yarn path, which comprises firing an alumina molded body that has undergone the molding and drying steps in a hydrogen atmosphere. 3. A method for producing a yarn path, characterized in that an alumina formed body that has undergone the forming and drying steps is fired by a hot isostatic press.