JPS63209998A - Manufacture of 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 Field of Application) The present invention relates to a method for manufacturing a ceramic pen nib, in which a molded product is partially stretched and then sintered.

(Prior Art) A method of manufacturing a ceramic pen nib of the type described above is disclosed in, for example, Japanese Patent Application Laid-Open No. 108597/1983.

OBJECTS OF THE INVENTION The method for producing a ceramic nib of the type described above has the advantage that a ceramic nib having an ink passage with very good capillary force can be obtained. The present invention makes effective use of this advantage and provides additional advantages such as the ability to easily attach the ink guide member.

(Means to achieve the purpose) In the present invention, the molded product is subjected to partial stretching treatment.

In the method for manufacturing a ceramic pen nib subjected to a sintering treatment, the molded product has a pipe shape with an inner hole, and at least a portion to be partially stretched has a slit communicating with the inner hole. The present invention also provides a method for manufacturing a ceramic pen nib, which is characterized in that after the partial stretching process, diagonal cutting is performed so that the slit portion is on the front end side.

The details will be explained below based on the attached drawings. The attached FIG. 1 shows an example of a molded product used in the present invention.

The molded article 1 has a circular pipe shape as a whole, and has a slit 3 communicating with the inner hole 2 in a part of the side wall. Note that the cross-sectional shape of the molded product 1 does not necessarily have to be circular; it can also be polygonal, for example, and
The inner hole 2 may be located at a location offset from the center, and the slit 3 may be formed over the entire length of the molded product 1.

This molded article 1 is obtained by using appropriate molding methods such as injection molding and extrusion molding using alumina or other sintered materials, and after performing partial stretching treatment while heating as necessary. state. Note that Figure 2 shows a uniformly stretched film.

For example, it may be non-uniformly stretched by heating non-uniformly.

In this way, the material is partially stretched until it naturally separates, or halfway through it, and is then sintered.

FIG. 3 shows the pen nib 5 that has undergone a diagonal cutting process and the like. Here, diagonal cutting may be done by grinding or cutting.

It can also be done before the sintering process. Now.

The pen tip 5 becomes thinner towards the front. It has an inner hole 6 having a small front opening, and a slit-shaped ink passage 8 whose front end portion is located in the writing abutment portion 7 and connected to the front portion of the inner hole 6. Here inner hole 6
An appropriate ink relay member made of a two-foam fiber bundle or the like is inserted into the ink relay member. By the way, Figure 4 shows an example of an ink-absorbing writing instrument (so-called cotton-filled writing instrument), but of course it can also be used as a writing instrument that uses an ink tank that does not utilize capillary force (so-called filled ink-type writing instrument). You can also do it.

(Example) 100 parts by weight of α-alumina with an average particle size of α5 μm, 15 parts by weight of polyvinyl chloride, 9 parts by weight of dioctyl heptatalate, and 2 parts by weight of stearic acid were mixed at 110° in a Henschel mixer.
After kneading for 090 minutes, a pipe-shaped molded product such as molded product 1 in FIG. 1 was obtained by injection molding. The design dimensions are an outer diameter of 4.
4 III.

The inner diameter is 2.5111. The total length is 40111. Also, from the 12th point from the tip, the length is 16111 and the width is 0.1230.
1 slit. Slit-shaped hot air (145°C) is generated while rotating this molded product about once per second.
After about 8 seconds, move it away from the hot air and quickly place it on a polyester resin stand with a single recess formed therein. Using the recess on this stand as a guide, stretch it at a stretching speed of about 5 cm and 7 seconds until it naturally separates. I strained it. This stretched product was cut at an angle of 60 degrees in the length direction of the stretched product so that the total length of the rear end was 251 seconds. This was subjected to dry degreasing treatment at 1100"C-1 for 20 hours and sintering treatment at 1600°C for 1 hour.After cooling and taking it out, measurements showed that the total length was 20mm, and the outer diameter of the rear end was A3m11.Inner diameter is 2.0 chicken.

The maximum opening diameter of the tip of the inner hole is 1.411. The width of the slit was 10 AjEI at the tip and 0.10 m at the rear end.

After barrel-polishing the sintered material and assembling it into an ink-absorbing writing instrument, we found that it had good ink discharge properties, smooth writing, and excellent dryness resistance with no scratches on the first stroke. It became.

(Effects of the Invention) According to the present invention, the obtained pen point does not have an ink passage with excellent capillary force, and when inserting the ink relay member into the inner hole, it is possible to The amount of ink inserted can be naturally regulated by the portion whose diameter is gradually reduced, and since the opening at the tip of the inner hole can be made small, drying of ink from the inner hole can be suppressed as much as possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the shape of the molded product used in the present invention, FIG. 2 is a perspective view showing an example of the state of the molded product shown in FIG. FIG. 3 is a longitudinal cross-sectional view showing an example of the shape of a pen nib obtained by the present invention, and FIG. 4 is a longitudinal cross-sectional view showing an example of the pen nib of FIG. 3 assembled into an ink-absorbing writing instrument. 1... Molded product, 2... Inner hole, 3... Slit, 4
...Thinning portion, 5... Pen tip, 6... Inner hole, 7
...Writing contact portion, 8...Slit-shaped ink passage, 9
... Ink relay member, 10 ... Chip holder, 1
1... Shaft cylinder, 12... Ink absorber.

Claims (1)

[Claims] In the method for manufacturing a ceramic pen nib, the molded product is partially stretched and then sintered, wherein the molded product has a pipe shape with an inner hole and at least the portion to be partially stretched is A method for manufacturing a ceramic pen nib, which has a slit that communicates with the inner hole, and which is cut diagonally so that the slit portion faces the front end side after partial stretching treatment.