JP3150535U - Ink cartridge for writing instrument and writing instrument using the same - Google Patents

Abstract

Even if oil-based ink is contained in an ink cartridge having a simple structure, ink leakage and plug removal do not occur, and ink can flow smoothly into the pen tip when a writing instrument is attached. An ink cartridge for a writing instrument that can be used and a writing instrument using the ink cartridge are provided. A container 2 having one end opened and the other end closed, and a plug 3 fitted into the opening of the container 2, and the plug 3 fitted into the opening of the container 2. Thus, the ink cartridge 1 for a writing instrument having an ink containing portion 21 formed therein is accommodated. Accommodates ~ 95% equivalent. [Selection] Figure 1

Description

  The present invention relates to an ink cartridge for writing instruments and a writing instrument using the same. Furthermore, the present invention relates to an ink cartridge for writing instruments that contains oil-based ink and an oil-based writing instrument using the same.

Conventionally, as an ink cartridge used for a writing instrument, an ink cartridge having a simple structure in which a stopper (packing) such as a spherical shape or a curved plate shape is fitted to an upper opening of a container containing water-based ink is used. (For example, see Patent Documents 1 and 2).
Japanese Utility Model Publication No. 37-21906 Japanese Utility Model Publication No. 47-25613

Although the cartridge has a simple structure, it is difficult for the stopper to come off when stored alone, and it is formed so that it can be easily removed by pressing the stopper when the writing instrument is attached.
However, when oil-based ink with a higher vapor pressure than water-based ink is stored in the cartridge, the internal pressure increases with changes in temperature and pressure during storage, and ink leakage may occur due to the plug being displaced or detached. is there. In addition, when the writing instrument is mounted, ink may not smoothly flow into the pen tip side due to the open state of the plug.

  The present invention solves the above-mentioned problems, and even when oil-based ink is contained in an ink cartridge having a simple structure, ink leakage and plug detachment do not occur, and a writing instrument is attached. There are provided an ink cartridge for a writing instrument and a writing instrument using the same that can smoothly perform ink inflow to the pen tip side.

The present invention comprises a container having one end opened and the other end closed, and a plug fitted into the opening of the container. By fitting the plug into the opening of the container, An ink cartridge for a writing instrument comprising an ink containing portion, wherein the ink containing portion contains oil-based ink, and the oil-based ink is contained in 70 to 95% of the total volume of the ink containing portion. As a requirement.
Furthermore, the oil-based ink has at least one selected from alcohol, ketone, ester, hydrocarbon, and glycol ether as a main solvent, and the vapor pressure of the main solvent used in the oil-based ink is 5 mmHg to 80 mmHg at 20 ° C. The volume of the ink containing part is 3 cm ³ or more, the container and the stopper are made of polypropylene, polyethylene, or ketone, and from the inside of the ink containing part of the stopper. The extraction force is required to be 1.5 kg / cm ² or more.
Furthermore, an oil-based writing instrument formed by mounting the ink cartridge for writing instruments is a requirement.

  According to the present invention, even if the ink cartridge is configured with a simple structure in which a stopper is attached to the opening of the container, the stopper may come off or the ink may leak due to an increase in internal pressure that easily occurs when oil-based ink is stored. Thus, an ink cartridge for a writing instrument that can smoothly flow ink to the pen tip side when mounted on a writing instrument and an oil-based writing instrument equipped with the cartridge are obtained.

  The ink cartridge for a writing instrument according to the present invention is an ink cartridge for a writing instrument having a simple structure in which oil-based ink is accommodated in an ink accommodating portion formed by fitting a stopper to an opening provided at one end of a container. is there.

The container is a cylindrical object having an opening at one end (upper side) and a bottom wall (closed portion) for forming an ink containing portion at the other end, and is formed of metal, resin, or the like. However, a resin is suitable because it has high moldability and can be obtained at low cost. In particular, polypropylene and polyethylene are used because they are hardly deformed or dissolved in oil-based ink (organic solvent). The radial cross-sectional shape may be any shape, but a circular shape with high plug assembly performance is preferred.
The container may be transparent or opaque, but is preferably formed of a transparent material so that the amount of ink contained can be visually recognized from the outside.
Furthermore, ribs and grooves extending in the axial direction can be provided on the inner wall surface of the container. Thereby, the inductivity of the ink at the time of writing instrument connection is improved, or when it has transparency, the visibility from the outside can be increased.

  It is preferable that a taper, a rib, a groove, and the like used for inserting and holding the stopper are formed in an upper portion (near the opening) of the inner wall surface of the container. Thereby, the insertion property at the time of plug body attachment can be improved, the attachment position of the plug body can be clarified, and the fitting force can be strengthened.

In the ink storage part (below the plug fitting part in the container), oil-based ink is stored in the range of 70% to 95% of the total volume. By setting the ink storage amount within the above range, a space in which ink is not stored is secured and a large amount of ink can be stored. Therefore, when the stopper is attached to the container (cartridge assembly), the ink is increased by increasing the internal pressure. There is no leakage, and when the cartridge is attached to the writing instrument, the stopper can be surely opened to secure the ink flow path, so that the ink can flow smoothly to the pen tip side.
If it is less than 70%, since the pressing force (internal pressure) from the ink container side when the plug is opened is small, the plug is difficult to be opened with a sufficient gap, and the ink does not flow smoothly into the pen tip side. If it is more than 95%, the increase in the internal pressure when the stopper is attached to the container becomes too large and ink leakage tends to occur.
In particular, the above conditions are effective even when the volume of the ink containing portion is large (a structure that has been disadvantageous in the past), and a higher effect is exhibited even when the volume is 3 cm ³ or more.

As the plug body, a resin molded product or a metal workpiece having a size capable of being fitted in the opening and capable of sealing the opening is used, and in particular, deformed or dissolved even when contacted with oil-based ink (organic solvent). A material that is not easily damaged is applied.
It is preferable that the plug body is set so that a pulling force from the inside of the ink storage portion is 1.5 kg / cm ² or more when the container is fitted. Thereby, even if it is a case where an internal pressure change is large, it can prevent reliably that a plug body remove | deviates by the pressing force from an inner side.

As the oil-based ink contained in the ink cartridge, an organic solvent such as alcohol, ketone, ester, hydrocarbon, or glycol ether is used as a main solvent.
Specific examples of the organic solvent include ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, isobutyl alcohol, sec-butyl alcohol, tert-butyl alcohol, tert-amyl alcohol, benzyl alcohol, ethylene glycol, diethylene glycol. , Propylene glycol, benzyl glycol, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, diethylene glycol monoethyl ether, diethylene glycol monophenyl ether, Propylene glycol Methyl ether, propylene glycol monoethyl ether, propylene glycol monophenyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monophenyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether, tripropylene glycol monophenyl ether, n -Heptane, n-octane, isooctane, methylcyclohexane, ethylcyclohexane, toluene, xylene, ethylbenzene, methyl isobutyl ketone, methyl n-propyl ketone, methyl n-butyl ketone, di-n-propyl ketone, n-butyl formate, isobutyl formate Methyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, propionate Le, n- butyl propionate, methyl butyrate, ethyl butyrate, dimethyl carbonate, diethyl carbonate, propyl carbonate, etc. can be exemplified.
The organic solvent may be used singly or in combination of two or more, and is used in the range of 30 to 90% by weight in the ink composition.

  In particular, among the organic solvents, those having a vapor pressure at 20 ° C. in the range of 5 mmHg to 80 mmHg are preferable. If it is the said vapor pressure, it can preserve | save without producing ink leakage, without impairing the balance as oil-based ink for writing instruments, and at the time of cartridge accommodation.

  Further, in the oil-based ink, dyes, pigments and other colorants, resins, and the like, which conventionally constitute inks, are added, and if necessary, antioxidants, dry-up resistance imparting agents, ultraviolet rays Various additives such as an absorbent, a rust preventive, a lubricant, a viscosity modifier, a release agent, a pigment dispersant, an antifoaming agent, a shear thinning agent, and a surfactant can be used.

The writing instrument to which the ink cartridge for writing instrument is attached can be used in the form of a general-purpose ballpoint pen or marking pen without any particular limitation on the structure or shape.
For example, a marking pen tip such as a fiber pen, a felt pen, a plastic pen, a fountain pen type metal pen, or a ballpoint pen tip is attached to the writing tip in front of the shaft cylinder, and the writing tip in the shaft cylinder. A structure that guides the ink in the ink cartridge to the ink occlusion body composed of a bundle of fibers housed in a connected state and supplies the ink to the writing tip, a comb-groove-shaped ink flow rate adjusting member or fiber behind the writing tip A structure in which an ink flow rate adjusting member made of a bundle is interposed and an ink cartridge is attached to the back of the ink flow rate adjusting member, a valve mechanism is provided between the writing tip portion inside the shaft cylinder and the ink cartridge, and Examples thereof include a marking pen (sign pen, felt pen, brush pen, etc.) and a ballpoint pen having a structure for supplying a fixed amount of ink.

  The writing instrument is preferably provided with a protrusion for pressing a specific position of the stopper when the ink cartridge is attached. As a result, the plug can be easily removed with a small pressing force.

An embodiment of the present invention will be described with reference to the following drawings.
FIG. 1 is a sectional view showing an ink cartridge for a writing instrument according to the present invention, and FIG. 2 is a sectional view showing a state where the ink cartridge is mounted on the writing instrument. Note that “upper” indicates the opening direction of the container, “front” indicates the pen tip side of the writing instrument, and “rear” indicates the shaft tube side of the writing instrument.

The ink cartridge 1 for a writing instrument is a bottomed cylindrical body having an upper end opened and a lower end closed, and is an upper opening portion of a container 2 obtained by injection molding or blow molding of a synthetic resin (specifically, polypropylene resin). A plug 3 is fitted on the inner wall surface. In the container 2, an ink containing portion 21 (inner diameter 1.4 cm, volume 6 cm ³ ) for directly containing the oil-based ink 4 is provided, and an annular protrusion 22 to be fitted to the plug body 3 is provided. Yes.

  The plug 3 is a disk-shaped product made of a polypropylene resin molded product, and in order to impart elasticity in the radial direction, the upper and lower ends of the portion (circumferential end) that contacts the container 2 are formed thin. The Thereby, when the stopper 3 inserted into the container 2 is press-fitted at the time of assembling the cartridge, sufficient air-tightness of the ink containing portion 21 is obtained. In particular, two annular protrusions 22 are provided on the inner wall surface portion of the container 2 with which the stopper 3 abuts, and the stopper 3 is fitted between the annular protrusions 22 so that the stopper 3 is more securely fitted. You can wear it.

The ink containing portion 21 sealed by the plug 3 is filled with oil-based ink 4 and a space 211 is formed above the ink.
The oil-based ink 4 is injected at 5.4 cm ³ and occupies 90% of the total volume of the ink containing portion 21 (that is, the space portion 211 is 10%).
By setting the ratio of the space portion 211 to 5% or more and less than 30%, the plug body 3 can be held in a fitted state even if volume expansion in the ink containing portion 21 due to a change in temperature or atmospheric pressure occurs. When the plug 3 is attached to the cartridge (when the cartridge is assembled), ink leakage does not occur due to an increase in internal pressure, and when the cartridge 1 is attached to the writing instrument 5, the plug 3 is securely opened to secure the ink flow path. The ink 4 can smoothly flow into the pen tip 6 side.

In addition, since the pulling force when the plug 3 is pressed from the inside of the ink containing portion 21 is set to 4 kg / cm ² or more, the plug 3 is less likely to be detached or displaced due to a change in internal pressure. Therefore, ink leakage can be surely prevented.

  The oil-based ink 4 uses ethanol (vapor pressure at 20 ° C .: 45 mmHg) and isopropyl alcohol (vapor pressure at 20 ° C .: 32.4 mmHg) as a solvent, and contains additives such as pigments, resins, and release agents. It is an oil-based ink for boards and has excellent handwriting dryness and erasability during writing.

  An oil-based writing instrument 5 (direct liquid type writing instrument) to which the ink cartridge 1 is attached is disposed at the back of the pen tip 6, the ink occlusion body 7 connected to the rear end of the pen tip 6, and the ink occlusion body 7. Intermediate member 8 (the ink cartridge 1 (container 2) is disposed behind the intermediate member 8), the pen tip 6 is held at the front end, and the ink occlusion body 3 and the intermediate member 5 are held inside. And a shaft cylinder 9 that accommodates the ink cartridge 1 and a tail plug 10 that is detachably screwed into a rear end opening of the shaft cylinder 9.

  The nib 6 is a rod-like body obtained by resin processing of synthetic resin fibers (for example, polyester fibers, acrylic fibers, nylon fibers, etc.). The front end of the nib 6 is ground like a bullet. The outer peripheral surface of the rear end portion of the nib 6 is chamfered in a tapered shape.

  The ink occlusion body 7 is made of a processed body of cylindrical synthetic resin fibers (for example, polyester fibers). The outer circumferential surface of the ink occlusion body 7 is covered with a cylindrical outer skin. The outer skin is made of a synthetic resin film (for example, a polyethylene terephthalate film). The rear end of the pen tip 6 is inserted into the axial center of the front end surface of the ink storage body 7, and the rear end of the pen tip 6 is positioned in front of the ink storage body 7.

  The shaft cylinder 9 is a cylindrical body obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The shaft tube 9 includes a tip 91 that holds the outer peripheral surface of the pen tip 7, and a main body 92 that is connected to the rear of the tip 91 and that accommodates the ink storage body 7, the intermediate member 8, and the ink cartridge 1. Consists of.

A plurality of ribs extending in the front-rear direction are integrally formed on the inner surface of the shaft tube 9, and the outer peripheral surface of the ink occlusion body 7 is held in pressure contact with the ribs. The outer peripheral surface of the pen tip 6 is pressed and held by the rib on the inner surface of the tapered portion 91.
By the ribs, between the outer peripheral surface of the ink storage body 7 and the inner surface of the main body 92, between the front end surface of the ink storage body 7 and the inner surface of the shaft tube 9, and between the outer peripheral surface of the pen tip 6 and the inner surface of the tip 91. In between, an air passage is formed.

The intermediate member 8 is obtained by injection molding of a synthetic resin (for example, polypropylene, polyethylene, etc.). The intermediate member 8 includes a partition wall 81 that partitions the ink storage body 7 and the ink cartridge 1, and a plurality of intermediate members that protrude forward from the front surface of the partition wall 81 and are pierced and connected to the inside of the ink storage body 7 (specifically 2) connecting pipes 82 (having a flow passage in the axial direction), a connecting pipe 83 projecting rearward from the rear surface of the partition wall 81 and inserted into the front end opening of the ink cartridge 1, and the partition wall 81 and a mounting cylinder portion 84 that projects rearward from the rear surface of 81 and is fixed to the inner surface of the shaft tube 9 (the inner surface of the main body 92). The ink occlusion body 7 is accommodated in a space formed by the shaft cylinder 9 and the partition wall 81 (that is, the occlusion body accommodation portion). In the present embodiment, the mounting cylinder portion 84 surrounds the outer periphery of the base portion of the connection pipe 83. The connecting pipe 83 is integrally formed with a protruding piece 831 for pressing one side of the plug body 3. The partition wall 81 has a disk shape, and each of the communication pipe 82, the connection pipe 83, and the attachment cylinder portion 84 have a cylindrical shape.
The partition wall 81, each communication pipe 82, connection pipe 83, and attachment cylinder portion 84 are integrally connected. In other words, the partition member 81, the communication pipe 82, the connection pipe 83, and the attachment cylinder portion 84 can constitute one part by the intermediate member 8.

  The inner surface of the front end opening of the ink cartridge 1 (container 2) is detachably fitted to the outer surface of the connecting pipe 83 of the intermediate member 8. When ink 4 in the ink cartridge 1 is consumed and writing becomes impossible, the ink cartridge 1 is removed from the connection tube 83, and the connection tube 83 is connected to the front end opening of a new ink cartridge 1 filled with ink 4 inside. Insert it. Thereby, writing becomes possible again. The front end opening of the new ink cartridge 1 is closed by a plug 3. When the connecting pipe 83 is inserted into the front end opening of the ink cartridge 1, the plug 3 is pressed backward by the protruding piece 831 of the connecting pipe 83, the plug 3 is removed, and the front end opening of the ink cartridge 1 is opened. It is plugged.

It is a longitudinal cross-sectional view which shows one Example of the ink cartridge for writing instruments of this invention. It is a longitudinal cross-sectional view of the writing instrument which mounted | wore with the ink cartridge for writing instruments of FIG.

DESCRIPTION OF SYMBOLS 1 Ink cartridge 2 for writing instruments Container 21 Ink accommodating part 211 Space part 22 Annular protrusion 3 Plug body 4 Oil-based ink 5 Direct liquid type writing instrument 6 Pen tip 7 Ink occlusion body 8 Intermediate member 81 Septum 82 Communication pipe 83 Connection pipe 831 Projection piece 84 Mounting cylinder 9 Shaft 91 Tip 92 Main body 10 Tail plug

Claims (7)

  The container has one end opened and the other end closed, and a plug fitted into the opening of the container. By fitting the plug into the opening of the container, an ink containing portion is formed inside. A writing instrument ink cartridge comprising: an oil-based ink accommodated in the ink-accommodating portion, wherein the oil-based ink is accommodated in an amount of 70 to 95% of the total volume of the ink-accommodating portion. Ink cartridge.   2. The ink cartridge for a writing instrument according to claim 1, wherein the oil-based ink contains at least one selected from alcohol, ketone, ester, hydrocarbon, and glycol ether as a main solvent.   The ink cartridge for a writing instrument according to claim 1 or 2, wherein the vapor pressure of the main solvent used in the oil-based ink is in the range of 5 mmHg to 80 mmHg at 20 ° C. The ink cartridge for a writing instrument according to any one of claims 1 to ^3, wherein the volume of the ink containing portion is 3 cm ³ or more.   The ink cartridge for a writing instrument according to any one of claims 1 to 4, wherein the container and the stopper are made of polypropylene, polyethylene, or nylon. The ink cartridge for a writing instrument according to any one of claims 1 to 5, wherein a pulling force of the plug body from the inside of the ink containing portion is 1.5 kg / cm ² or more.   An oil-based writing instrument equipped with the ink cartridge for a writing instrument according to any one of claims 1 to 6.

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