JPS5979798A - Member made of resin of note - 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 The present invention relates to a rosin member for a writing instrument that requires contact with ink for the purpose of ejecting, guiding, or retaining ink. This suppresses problems such as people being cooped together.

Taking a resin pen nib with a star-shaped ink passage in cross section as an example, the capillary force at each vertex of the star-shaped ink passage is stronger than at the center of the star.

Ink discharge is also relatively quick.

When introducing ink to the pen tip for the first time (such as during assembly),
Based on the foregoing, ink reaches the tip of the nib first at each apex portion of the star ink path, with ink in the center of the star arriving at the tip of the nib later.

At this time, what often happens is that before the ink at the center of the star reaches the tip of the pen tip, the ink at each point of the star that has already reached the end of the pen mixes with each other, creating air in the ink passage. This results in the formation of clumps.

The aforementioned phenomenon is generally referred to as air entrapment.

Once this happens, the ink in the center of the star shape will be blocked from reaching the tip of the pen tip, resulting in poor ink ejection onto the writing surface.

The phenomenon of air entrainment does not only occur when the ink passage has a star-shaped cross section.

In addition to being used as a pen tip, for example, it can be used as an ink relay member (so-called bellows) having an ink reservoir groove with a comb-shaped longitudinal section, or between a falling weight in a small tube type writing instrument and the surrounding members. There is a possibility that the problem may occur even if the ink is composed of 1n path.

Ink discharge and guidance in writing instruments.

It is necessary to set the holding function extremely strictly, and in addition to the above-mentioned air entrapment, there may be other problems caused by uneven contact with the ink.

Common things are made by extrusion molding, injection molding, etc. Polyacetal, polyamide.

Polyolefin, polyurethane, polyester.

polyether, polyvinyl, polycarbonate.

The resin part, such as polyphenylene, has an orderly contact surface with the ink. In other words, using a pen nib as an example, 9. In the case of pen nibs made by foaming or sintering, which have a disordered contact surface with ink, such as porous nib or felt nib, it is isotropic due to disorder. It can be said that this has good results against the air entrainment mentioned above, or that those having an orderly contact surface with ink have a bad effect due to the disorder due to the order.

The present invention has an ordered ink contact surface, and a large number of ink corrosion-resistant and ink-philic fine particles are stuck to the ink contact surface described in 61. The gist of this work is the writing implement ZENJI SEIBURI, which takes advantage of the disorder brought about by fine particles.

Attached FIG. 1 is an enlarged schematic diagram of a portion of the 1η↑ fat shell. Reference numeral 1 denotes a resin portion and a stopper 6 is attached thereto. The fine particles 6 are inorganic substances.

It does not matter whether it is organic or not, but it has corrosion resistance and acidity against ink. Therefore, repellent materials cannot be used. However, the size of the fine particles 6 and the adhering dust are such that they do not impair the original shape of the ink contact surface. That is, to the naked eye, the difference in the shape of the ink contacting surface between the one with the fine particles 3 attached and the one with no attached fine particles 3 cannot be easily confirmed. It may vary depending on the state of the ink contact surface 2 or the shape of the ink passage.
Microwave C-3 having a particle size of less than lnn is attached. Or, even if there is a very fine squid diameter, it is about 5
It is preferable that the layers are not laminated to a thickness greater than μm. The same applies even when the particles are in the form of fine particles or elongated. Rather, even if the diameter is small, it is preferable to keep the distance between them.

That is, when viewed microscopically, even if the fine particles 6 are in contact with each other partially, they are generally spaced apart from each other. This interval varies depending on the type of +ft4 fat and ink, but usually the average interval is 100μm.
Hereinafter, it is more preferable to set it to the number i Q ln++ or less.

Figure f to 2 is an enlarged schematic diagram of part A in Figure 1. For example, when polyacetal is extruded using a monofilament self-fusion method.

Due to the crystallinity of the fat, etc., a depression 21 is formed on the ink contact surface 2.
1 may be formed naturally. and.

According to the experimental results of the present inventors, this naturally formed depression:
The presence of 2;1 tends to aggravate the aforementioned problems such as air entrainment.

That is, if it is recognized that the problem is exacerbated by the recess 2a as described above, as shown in FIG.

It is preferable that a considerable amount of fine particles 6 be distributed even within the recess 2a.

The method for depositing the fine particles 6 as described above is as follows.

For example, coid dispersions can be used. In this way, colloidal particles such as metals or their oxides or halides can also be deposited. An example of a commercially available product is Snowtex 20. 30. Same 4
0. Same C1 Same N.

Same O1 Same S, Same 20L, Same OI7. Cass 25゜40
．． Methanol Rika Sol PC! -500° Rabbit Binder Nl was also sold by one person, Rabbit Binder N1 was sold by 10, and silica sol such as Pontex was sold by Yasan Kagaku Kogyo (Kiki).
We also sell them.

Basically, it is sufficient to appropriately dilute one or a mixture of sols with lower alcohol, acetone, etc., soak the resin part 44 in water, and then remove one dispersion medium. Dilution itself is quite possible.

According to the inventors' experiments, the aforementioned methanol/Licasol 1"
Very good Q'f results were obtained by diluting l-500 with 0.1% methanol overnight.

The effects of the present invention are as follows. When the ink is first introduced to the ink contact area 2, the ink that would move quickly or slowly in an orderly manner if the fine particles r-6 were not present is given chaotic mobility by contacting the fine particles 3. Ru. In other words, the ink that exists on the path that should be moving the fastest is also 1 sun, and the ink that exists on the path that should be moving the slowest is also subject to the same degree of regulation by the fine particles 3, and the relative proportion of the moving speed is accordingly reduced. becomes smaller. As stated at the beginning
In the case of a pen nib having two star-shaped ink passages in cross section, at least the delay time of ink at the center of the star, which reaches the tip of the nib after the apex of the star, is reduced.

Therefore, the phenomenon of air entrainment becomes less likely to occur.

[Brief explanation of the drawing]

FIG. 1 is an enlarged schematic diagram for explaining the present invention. Figure 2 is an enlarged model of section A in Figure 1. 1...1 grease part, 2...ink contact part, 6...fine particles. Patent applicant: Bentel Co., Ltd.

Claims (1)

[Scope of Claims] It has an ordered ink contact surface, and a large number of ink corrosion-resistant and ink-philic fine particles are deposited on the ink contact surface. Resin parts for writing instruments.