JPS6323174Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a resin ink cartridge, and its purpose is to allow water or other solvents in the ink to pass through the walls of the ink cartridge and evaporate, thereby reducing the amount of ink. The purpose is to prevent the ink from becoming highly concentrated, increasing its viscosity, and preventing the ink from being drawn out smoothly.

Conventionally, ink cartridges have been made of resin instead of metal to reduce costs, but ink cartridges are inserted into the barrel of the main body of the writing instrument, and the diameter of the barrel can be increased. Since there is an actual upper limit to the amount of ink that can be filled, the wall thickness must be made thinner to ensure the specified amount of ink filling.
The disadvantage is that water or other solvent in the ink passes through the thin resin wall and evaporates, causing the ink to lose weight and become highly concentrated, increasing the viscosity and making it difficult to discharge the ink smoothly.

In the present invention, an inorganic plate-like filler is mixed into the resin along the wall surface of the ink cartridge, thereby making it difficult for ink vapor to pass through the wall, thereby eliminating the drawbacks of the conventional method.

Regarding the ink cartridge resin and inorganic flat filler of the present invention, various synthetic resins such as polypropylene, hard polyethylene, vinyl chloride, polycarbonate, polystyrene, and ABS can be used as the ink cartridge resin. Also, as a flat filler, mica,
To improve wetting with crystallized glass, metal foil, graphite, molybdenum disulfide, broken ceramic balloons, untreated materials such as boron nitride, or resin, use a titanium coupling agent or silane coupling agent. The treated product is suitable and has a size that does not inhibit the moldability of the resin (if it is too large, the molded product will become brittle, so generally it is about 100μ x 100μ.Also, the ratio to the thickness is 10 times or more, for example) larger is preferable) and range amount (generally up to about 30% by weight)
Available in

In addition, in order to orient the inorganic flat filler in the resin cylinder, no special method is required; for example, in the case of injection molding, by setting the gate at the rear end or the front end, or by placing the gate at the rear end or the front end in the case of injection molding, In the case of blow molding, the flat filler is oriented along the wall surface of the resin cylinder by passing through a nozzle under pressure, or by enclosing air in the case of blow molding.

Next, an embodiment of the present invention shown in the accompanying drawings will be described in detail. 1 is an ink cartridge made of polypropylene with an inner thickness of 0.5 mm;
A flat filler 1a made of mica with an average size of 20×10μ is placed on a polypropylene resin 1b along the wall surface.
7% by weight of orientation is mixed in.

The ink vapor in the cartridge is prevented from moving straight by the inorganic flat filler 1a, as shown in FIG. 3, and moves in a zigzag pattern. Therefore, the effect is the same as increasing the thickness of the ink cartridge 1.

Figure 4A is a graph showing the number of days over time and ink evaporation loss for an example of the present invention (using polypropylene as the resin and mica with a thickness of 0.5μ and an average size of 20×10μ as the flat filler); This is a graph of a conventional ink cartridge made only of polypropylene resin. The wall thickness of each ink cartridge was 0.5 mm, and measurements were taken in a constant temperature and humidity room at 50°C and 30%. As shown in this graph, the conventional product takes 22 days.
The present invention is extremely effective as it takes 33 days to reduce the weight by 0.03gr. Note that the present invention is not limited to a so-called "raw ink type cartridge" like the ink cartridge in a general fountain pen, but has an ink guiding member such as a fiber bundle built-in. It may be a so-called "wadding type cartridge" or may have a metal part partially, such as the entire stopper.

[Brief explanation of the drawing]

FIG. 1 is an upper half-cut front view of an embodiment of the present invention;
Figure 2 is an enlarged partial front cross-sectional view of the wall in Figure 1;
The figure is an explanatory diagram showing the effect of the present invention, and FIG. 4 is a graph showing the number of days over time and the evaporation loss of ink. 1... Ink cartridge, 1a... Inorganic flat filler, 1b... Resin.

Claims (1)

[Scope of utility model registration request] An ink cartridge comprising an inorganic flat filler mixed into a resin so as to be oriented along the wall surface.