JPS60168683A - Sintered nylon resin body for ink-impregnated platen for printer - Google Patents

Abstract

PURPOSE:To enhance radial crushing strength constant and durability and enable an ink to smoothly exude when printing, by forming a sintered nylon resin body from a powder of a eutectic mixture of a 6,6-nylon resin and a 6,10-nylon resin. CONSTITUTION:A magnet piece 9 is fitted into a hole 8' provided in a printing body fitting surface 8 of a platen substrate 7, and an ink-impregnated sintered nylon resin body 5 with an iron plate 6 fixed to the bottom surface thereof is replaceably fitted to the magnet piece 9. The sintered body 5 is produced as follows. First, 6,6-nylon resin pellets having a relative viscosity of 4.0 are mixed with 6,10-nylon resin pellets in a weight ratio of 7:3, the resultant mixed pellets are dissolved in a mixed solution based on ethylene glycol by heating to a temperature of 165-170 deg.C, followed by cooling to precipitate an eutectic mixture, thereby obtaining a powder of the eutectic mixture. Then, the powder is press- molded, followed by sintering to obtain a sintered body having a porosity of 15-35%, a Shore hardness of D67-79 and a radial crushing strength constant of 2.2-2.8kg/mm.<2>. Accordingly, printing quality and durability can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION ([Object 1] Kikomei relates to a Nylon sintered body for an ink-impregnated platen of a Zoladen-type printer, in which the printing surface is formed from an Rink-impregnated multi-porous material, and the purpose thereof is to 1 in printability and durability
The purpose of this method is to capture the ink-impregnated platen.

(Prior Art) Printers currently used for I-Tem terminal devices and computer output devices use character forming elements such as type or wire to selectively strike a platen through an ink ribbon and printing paper. So-called ink ribbon printers that print on printing paper using paper are widely used.

In particular, dot matrix printers using Wi-A7 as character forming elements are small and inexpensive, and are widely used as printers capable of printing 'CC50 characters, symbols, figures, etc.

However, ink ribbon type printers require a set of ink ribbons to be installed and run, making the mechanism complicated.Recently, with the diversification of printer usage, it has become possible to print not only black but also various colors. There is an increasing demand for multi-color printing, but in this case, it becomes necessary to provide a plurality of print heads according to the number of colors on the ribbon, which makes the mechanism even more complicated.

An ink platen type impact printer as shown in FIG. 1 was developed as an INVAC 1 complete printer which overcomes the drawbacks of the ink ribbon type printers as described above and can easily perform multicolor printing with a simple mechanism.

This includes an ink-impregnated platen 4 on which a plurality of ink-impregnated porous bodies 5 are attached via a printing paper 3 to form a printing surface, facing a print head 1 having wires 2 as character forming elements, and This printer prints on printing paper 3 in a predetermined color by appropriately rotating an impregnating platen 4 to select an ink-impregnated porous body 5 of a predetermined color as a print surface, and by striking the print surface with a wire 2.

As an example of the ink-impregnated platen in the printer, as shown in FIG. An iron plate 6 is fixed to the bottom surface of the ink-impregnated porous body 5, and the ink-impregnated porous body 5 is attached to the base body 7 by magnetic attraction force, and six theories of the ink-impregnated porous body 5 are freely expressed. When the body 5 runs out of ink or is damaged, it can be replaced freely.
Furthermore, by appropriately replacing porous bodies impregnated with ink of each color prepared separately, it is possible to perform extremely multi-colored printing.pY
It's convenient.

In the above-described ink platen type impact printer, the characteristics of the porous body and ink that constitute the ink-impregnated porous body affect the printing quality and the durability of the printed body.

Printing in this type of printer is performed when the surface of the ink-impregnated porous material is struck by a wire through the printing paper, and the ink that oozes out on the surface of the ink-impregnated porous material is transferred to the printing paper. Immediately after printing is completed, ink is replenished at the printing point by a pumping action based on capillary action and minute elastic deformation of the ink-impregnated porous material, and the ink is prepared for the next printing.

In order to obtain good print quality, it is necessary that the ink leaching and replenishing action in the ink-impregnated porous body described above be performed smoothly, and this requires not only the characteristics of the ink but also the porous body. Various properties such as porosity, pore size, elasticity, and wettability with ink affect the material.

In addition, the ink-impregnated porous material does not undergo dimensional changes due to temperature and humidity or the influence of ink, and has a diameter of 0.1 to 0.
In order to maintain good print quality over a long period of time, it is necessary to have excellent strength so that it will not be damaged even if it is violently and frequently struck by a thin (hard) wire such as a 3 mm tungsten wire. .

In view of the situation in which the ink-impregnated porous "IjJ body satisfying the above-mentioned 8-type yarn f1 is not produced,
It was created as a result of extensive research and research to develop an ink-impregnated porous material with excellent printing quality and durability.

(Constitution) A low iron 66 resin with a relative viscosity of 4.0 or more and a nylon resin with a methylene number of 7 or more per amide W1fI are heat-dissolved in a solvent and then reprecipitated. This is a nylon resin sintered body for a printer's ink-impregnated platen, which is characterized by being formed based on powder, and will be described in more detail below based on examples.

Example 1 Relative viscosity 4. Ot nylon 66 resin Asahi Kasei A 150
0, melting point 26℃, water absorption rate 1.3%) Beret [・and nylon 610 resin (Higashi, Amiran CM2O01, melting point 21
7°C, water absorption rate 0.5%) pellets and ftff1 ratio of 7
:3 and 165 to 17 to ethylene glycol mixed solvent
After heating and dissolving at 0°C, the eutectic mixture of both resins was precipitated by heating and melting, and the precipitate was washed and dried to obtain nylon 66.
First, a eutectic mixed powder of resin and nylon 610 resin was obtained.

Next, the eutectic mixed nylon resin powder was filled into a predetermined mold according to a conventional method, and then heated at 800 to 900 K (l) at room temperature.
The molded product was compacted at a pressure of y'cm2 and sintered in a non-oxidizing atmosphere at 260°C for 60 minutes to obtain a porosity of 15-35%, Shore hardness D67-79, and radial crushing. A sintered body of 2.2 to 2.8K (J/mar')
It was.

Example 2 Relative tI! Nylon 66 resin with degree J of 4.5 (lI11 chemical conversion, SiAs 1700 melting point, 260°C, water absorption rate 1.3%)
Beret and nylon 612 resin (DuPont, Daydel 1
58L, melting point 214°C, water absorption 0.4%) pellets were used at a weight ratio of - to 720, and as in Example 1, after adding 1 part of the fused powder of both resins, A sintered body having a porosity of 15 to 35%, a Shore hardness I) of 69-81, and a radial crushing strength of 2.3 to 2.9 Kg/n1I112 was obtained in accordance with a conventional method.

Example 3 (11 vs. viscosity 6.0 Nair [1 vs. 66 resin (ICI).

Maranil A153, melting point 260℃, water absorption ¥1゜3%
) Pellet 1-donai [1-11 resin ([1 wood rilsan,
Fine powder N2, melting point 187℃, water absorption rate 0.3%)
Using -C at an ill ratio of 8:2, a eutectic mixed powder of both resins was obtained in the same manner as in Example 1, and this was then used as a base.
Porosity 15-35% according to 1, Shore hardness D6Q
To 81, radial crushing strength 2.3~2゜9 K Q,,'
ml112 Yakimura, 1 bottle f7/ko.

Example: Pellets of Souito 1ton 6G resin (ICI, Maranyl Δ153) with a relative viscosity of 6.0 and nylon 12 resin (Darcelle, Diamid X 1988, melting point 177°C, water absorption 0.25%) pellets. was used at a weight ratio of 8:2,
After obtaining a eutectic mixed powder of both resins in the same manner as in Example 1, a powder with a porosity of 15 to 35%, a Shore hardness of D69-81, and a radial crushing strength of 2.3 to 2.9 was prepared using a conventional method. 1 sintered body
It's q.

Comparative example 1 Nylon 66 resin with a relative viscosity of 2.9 (Asahi Kasei).

1300 (melting point 260°C, water absorption 1.3%) was dissolved in Veret 1 using 1 dilene glycol as a solvent, then cooled and reprecipitated, using the powder obtained. Porosity 15-35% according to the law, Shore hardness D64
-76, a sintered body with a controlled radial crushing strength of 1.3 to 1°9 kg/kg was obtained.

Comparative Example 2 Relative viscosity/1.0 nylon 66 resin (Asahi Kasei Asu1
500) Powder was obtained using the pellets in the same manner as in Comparative Example 1, and based on this powder, the powder was prepared according to a conventional method with a porosity of 15 to 35%, a Shore hardness of D of 65 to 77, and a radial crushing strength of 1.4 to 2.0 K (1
A sintered body of /mob2 was obtained.

Comparative Example 3 Nylon 66 resin with relative viscosity ff14.0 (Asahi Kasei, ShiA
Same as in Example 1, using 1500) pellets and Nine 6 resin (Amiran CM1017, melting point 215°C, water absorption 1.8%) pellets with #fX ratio of 7=3. After heating the eutectic mixed powder to 19%, it was heated to -C porosity 15-35%, Shore hardness I) 6B -80
A sintered body having a ring strength of 2.1 to 2.7 Ka/111111' was obtained.

Comparative example 1 66 resin (Asahi Kasei, ShiAsu 1) with a relative viscosity of 10
500) Beretsu 1 ~ and Nai [1 n 610 resin (East)]
7 Miran CM2O01) Beretsu 1 to 1 were separately dissolved in a hot L brene glycol solvent, and then cold IJJ L reprecipitation was performed. : Using a mixture of 3, C according to d1, porosity 15-35%, Shore hardness D 66-78
, radial crushing strength 1.7-2.3K (J/ +1m2(7) sintered body 1r'1/, -,.

The relative viscosity of C1 in this Komei is JIS K 681.
This is a value measured using a 98% sulfuric acid solution based on 0.

The results of evaluating the practicality of the sintered bodies shown in the above Examples and Comparative Examples for use in printer ink-impregnated platens are as follows.

Currently, as a common nylon sintered body, a sintered body formed using a so-called injection molding grade nylon 66 resin having a relative viscosity of about 2.9 is used, as shown in Comparative Example 1.

When this nylon sintered body is used for an ink-impregnated platen, it has low radial crushing strength and lacks durability, and it is difficult for the ink to seep out and replenish smoothly during printing, resulting in print breakage and a decrease in printing 11 degrees, resulting in printing performance. inferior to

Furthermore, this nylon sintered body is impregnated with ink made by dissolving oil dyes in fatty acids or fatty acid esters, but it is eroded by the ink and swells slightly, and deforms due to moisture absorption, making it unsuitable for use in ink-impregnated platens. It was inappropriate.

Polymer nylon 6 with a relative viscosity of about 4.0 is an improved version of the conventional general nylon sintered body described above.
In Comparative Example 2, CSpec. .

Although the durability and printability of this test R1 were slightly improved compared to Comparative Example 1, they were still insufficient, and the ink resistance and moisture resistance were also poor, so it should not be used for ink-impregnated platens. It was appropriate.

Comparative Example 3 is the polymer ffl nylon 6 used in Comparative Example 2.
This is a case where a sintered body is formed using a mixed powder of nylon 6 and nylon 6. Although this has improved radial crushing strength and durability, it has poor durability due to the influence of nylon 6, which has a high water absorption rate. The ink properties and moisture resistance were extremely poor, and the sintered body swelled and warped, making it unsuitable for use in ink-impregnated platens.

Comparative Example 4 was prepared by mixing four chemically pulverized powders of nylon 12, which has a lower melting point and water absorption than Nylon 66 and Nylon 66, which were used in Comparative Examples 2 and 3. This is a sintered body formed by

When this sintered body is used, the ink resistance and moisture resistance are improved and good, but it is easy to break the print and reduce the print density, resulting in poor printing performance and insufficient durability. It was unsuitable for use in ink-impregnated platens.

On the other hand, first, as the base nylon 66 resin, a polymer m resin with a relative viscosity of 4.0 or more is used, and this and nylon 66 resin are used.
A nylon resin having a melting point and water absorption rate lower than that of 6, that is, a nylon resin having a meb=lene group of 7 or more per amide group is mixed to form a powder, and a sintered body is produced based on this powder. Examples 1 to 7I show cases in which .

The ink-impregnated platen using the sintered body of this example is
When the radial crushing strength is high and the durability is high, the Jt has excellent printability, ink resistance, moisture resistance, etc., and extremely good results have been shown.

The ethylene glycol mixed solvent used in the examples was ethylene glycol, propylene glycol, and 1.
5-bentanediol, benzy, '1.・The combination of nylon resin containing alcohol, dimethylacetamide, etc. and the blending ratio thereof are fti, and an appropriate amount is blended.

Therefore, by appropriately determining the formulation of this mixed solvent and the cooling speed for re-precipitating the dissolved resin based on experiments, etc., the optimum particle size and particle size for forming a sintered body for an ink-impregnated platen can be obtained. Although it is possible to obtain a powder in a melt-mixed state, it is appropriate that the particle size of the powder be 10 to 70 μm.

In addition, Nylon 6G resin and Nylon 610, which is a Nylon resin with 7 or more membrane groups per amide group,
Buoy [Nien 612, Nylon 11,)-Iron 12;
9. It is appropriate for the ratio m to be approximately 9.5:0.5 or 6:4 in terms of Φω ratio.

This is because the radial crushing strength increases as the amount of the low melting point nylon 4DI resin blended with Vylon 66 resin increases.
When the porosity of the material decreases, the pore size decreases as well.
As the sink oozes out and replenishes smoothly, the radial crushing strength can be expected to increase due to the blending effect as the print 1'1 decreases and the amount of this compound decreases.
Because of Z (-there is.

(RII SONG) As described in OO, the nylon resin sintered body according to the present invention is
It has high radial crushing strength and is highly durable, and the ink oozes out and replenishes smoothly during printing, so there is no print breakage or decrease in print density.Furthermore, it has excellent ink resistance and moisture resistance, so it can be used with impregnated inks and The sintered body did not swell or warp due to moisture absorption, making it extremely suitable for ink-impregnated platens in printers.

Therefore, according to the present invention, it is possible to easily provide a printer that is capable of multi-color printing and has excellent printing performance and durability, and this effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an outline of an ink platen type printer, and FIG. 2 is a perspective view showing an ink-impregnated platen. 1...Print head, 2...Print buoy A7.3...
Printing paper, 4... Ink-impregnated platen, 5... Ink-impregnated porous body, 7... Platen base.

Claims (1)

[Claims] Nylon 66 resin with a relative viscosity of 1.0 or more and a nylon resin with 7 or more methylene groups per amide group.
A sintered nylon resin body for an ink-impregnated platen of a printer, characterized in that it is formed based on a eutectic mixed nylon resin powder obtained by hot dissolving in soot and then reprecipitation.