JPS61106298A - Pen point made of ceramic - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention has a sour taste, impact resistance, and ink discharge properties.

Concerning a ceramic pen nib that has excellent comprehensive properties such as dust clogging resistance.

[Conventional technology]

Various oxides such as alumina, zirconia, silicon nitride,
Among the known non-oxide ceramic pen nibs, 1
For example, JP-A-58-138697 discloses that the porosity is 2% or less.

There is a disclosure that if the content is preferably 1% or less, impact resistance etc. will be improved.

[Problem that the invention seeks to solve]

Although we do not deny the general trend of reducing porosity in order to smooth the writing experience and improve impact resistance, the overall characteristics of the pen nib are not necessarily affected by the shape of the nib. It seems that the smaller the porosity, the better. That is, 1. The present inventors 1. Dust clogging resistance.

One of the pen tip shapes with excellent ink ejection properties.

Like the pen nib 1 illustrated in the attached drawing, the tip part 3 of a tapered tip 2 whose tip converges is used as a writing contact part, and has an ink groove 4 whose tip converges as the tip of the tapered tip 2 converges. We have continued to study this topic, and have found that if the porosity is made too small, the relationship between writing quality and ink ejection performance becomes particularly unsatisfactory.

[Means for solving problems]

Therefore, one aspect of the present invention is to use the tip portion of the tapered tip that converges as the writing contact portion, to have an ink groove that converges as the tip of the tapered tip converges, and has a porosity of 2.
% to 10% ceramic nib.

[For production]

Because it is an ink groove, it has better resistance to dust and dirt as an ink passage than continuous holes or ink holes, and the convergent tip allows you to write while maintaining strength against vertical cracking. An ink passage is located in the contact area. Alternatively, it basically has the advantage of being extremely close to each other and therefore has excellent ink ejection properties, but the inventors have investigated the relationship between writing feel and ink ejection properties mentioned above in relation to porosity. The discussion is below.

Although the ink ejection performance is basically excellent, not all of the writing contact area is occupied by the ink groove, so if the ink transfer to the wall surface of the nib other than the ink groove is poor, the first stroke may be blurred. The resulting smudges and smudges also impair the smoothness of the writing experience to the extent that the ink does not transfer, but the ink transferability is closely related to the smoothness of the wall surface.

The smoother the wall surface, the more difficult it is for ink to transfer to the wall surface.

In addition, the capillary force itself in the ink groove becomes weaker if the wall surface is smooth, so if the wall surface is too smooth, the ink ejection performance will be poor and the improvement of the writing quality will be ineffective. The smoothness of the wall surface has a close relationship with the porosity, and therefore, it cannot be said that reducing the porosity necessarily improves the overall characteristics of the pen nib. On the other hand, the pen nib of the present invention is considered to have a wall surface condition suitable for a pen nib having the above-described shape by imparting a porosity within the above-described range.

〔Example〕

A ceramic pen nib having a porosity in the above range and having the shape shown in the attached drawing is just one example.1 For example, six ink passages 4 are drawn in one drawing, and the ink passages 4 may be crossed as appropriate, including the case where there is only one ink passage. It can be formed in an appropriate number of plane shapes, or one
In addition to having a circular cross section as a whole as shown in FIG. 3, it is also possible to have a polygonal or flat cross section.

The following is an additional note regarding the manufacturing method.

No particular limitations are necessary in manufacturing the ceramic nib of the present invention. Rather, porosity is adjusted by the average particle size and size distribution of the sintered material used, whether or not a plasticizer is used, and the overall blending ratio of the material.

This can be achieved by setting various conditions such as the pressure during molding and the maximum temperature during heat treatment. Once manufactured, if the desired porosity is not achieved, it is sufficient to repeat the process of manufacturing by changing some of the conditions, and then manufacturing again in consideration of the tendency of the porosity change. However, even if they have the same porosity value, if the individual pores are too large, the uniformity of the nib itself will be impaired.From this point of view, materials with large particle sizes should be avoided, preferably a few μm.
Or better to use something less than that.

(Manufacturing method example: α-alumina 100 with an average particle size of 06 μm and a maximum particle size of 6 μm.
1 part by weight of magnesia 0 with an average particle size of 13 μm and a maximum particle size of 5 μm, 20 parts by weight of polyvinyl chloride, and 12 parts by weight of dioctyl phthalate were thoroughly kneaded in a kneader heated to 100°C. 1 After pelletizing and extrusion molding at 70°C.

The sample is stretched, heat treated at a maximum temperature of 1500°C, and then polished to obtain a pen nib as shown in the attached drawing.

(Effects of the Invention) Products with different porosities were obtained by changing various conditions in the above-mentioned manufacturing method examples, and these were incorporated into the vessel/main body and tested. Table 1 shows the results.

Table-1 0: Good Δ: Slightly poor ×: Poor 9 The ceramic pen nib of the present invention has excellent overall characteristics. 1 It fully demonstrates the abrasion resistance of ceramic, and the handwriting does not become thick. It is extremely suitable as a pen nib that can be used for a long time.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part for explaining an example of the shape of the ceramic nib of the present invention, FIG. 2 is an enlarged view of part A in FIG. 1,
FIG. 3 is a cross-sectional view taken along line II in FIG. 1.

Claims (1)

[Claims] A ceramic pen that has a tip portion of a tapered tip that converges at the tip as a writing contact portion, has an ink groove whose tip converges as the tip of the tapered tip converges, and has a porosity of 2% to 10%. Ahead.