Ebonite is difficult to process and requires
high expertise in manufacturing. Ebonite for handmade arts and crafts is
very elastic and has a special feel which is loved by many people. a weak
point is that they are prone to breakage
after long time usage.
Cervico-omo-brachial
syndrome etc.
Recently we Nakaya
receive a question about some disease related to writing such as
Cervico-omo-brachial
syndrome , vaginal synovitis or mogigraphia .
It is not in the
standpoint where the steady talk is told because we are not the health care
practitioners.
However, I think that it
feels the ebonite light like the above-mentioned even if the specific
gravity is small and Nakaya's penholder is large.
It keeps picking up a small, thin penholder and
it not writing down but a large, fat axis being said and
having it might be able to say the load to encompassing the hand as a whole
not resting upon to the first joint and a specific
part.
ECervico-omo-brachial syndrome
The pain and the numbness of the muscle
that reaches from the neck to the shoulder, the arm, and the back are
symptoms. It is said the key puncher disease and now the personal computer
syndrome before and the repetition of the mindless job that handles the
minion is the cause. Tiredness collects in a specific part by overworking
the muscle by repeating the mindless job.
EMogigraphia
Symptom that hand trembles when it tries to
write character. Can it learn by experience only when the character is
written and other operation be done without trouble. Is it an attack by
30-one's fifties or a lot. When
it is one of the neuroses involontary movement in a recent medicine to which
the muscle is strained by the brain injury of dystonia though has been
thought, it is located for a long time.
The tendency is strong though the cause is
indefinite when the segment of the body such as writers , pianist and typist
are repeated and it uses it for a long
time.
"Wine barrel"
The material (oak) being used for the barrel of the wine in the famous winery
for a long time is brought down, and a shaft is being cast.
How do you take grain? Various handles appear (Is it vertical or a side-glance?)
Because it is natural material, there is no same handle.
It (Urushi) lacquers a surface for the finishing. The way of seeing grain and the unevenness degree on the surface are varying
according to that number of times and the quantity.
3.Plastics
Strong against acid, durable, beautiful and easy to process. Resin, abs resin, acrylic fibers are commonly used.
"Canvas Micarta"
The barrel is made from Canvas Micarta.
Canvas Micarta is solidified material composed of about 2 cm width phenol
resin and four- layer piled canvas.
This material was developed an American maker for applying to the grip of guns,
and now it has become quite popular for the handles of knives due to it's a various peculiarities,
such as lightness, durability and skid resistance, as well as it's resistance to water & impact.
It is interesting that stripes like wood trunk appears when this material is lathed,
and at the finishing stage of the barrel, its anti- skid quality increases due to the texture.
4.Metal
Easy to process and design, metal can be designed very fashionable by plating. Aluminum, stainless steel,
brass are commonly used.
Japanese Art "MAKI-E(URUSHI)"
Briar
Ebonite
Celluloid
Aluminum
Stainless
Celluloid is flammable, half transparent plastic material which is made by mixing nitric-cellulose
(sulfuric acid and nitric acid are added to cellulose), camphor and alcohol.
When colored it is splendid. It softens by 90 degrees Celcius and hardens when cooled.
As it is easy to cast and carve and also produce in a variety of colors and patterns, most pen barrels
were made of this material in the past.
However, as it must be dried more than 6 months to prevent from deforming
and twisting it has been recognized as a difficult material.
Recently it has become popular again with those who pursue antique designs.
