JPH0563320B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is applicable to a wide variety of ink flow media depending on the application, such as a pen nib for a writing instrument, or an ink transport medium between an ink reservoir and a brush nib. The present invention relates to a method of manufacturing an ink flow conductor used as a tube.

(Prior Art) In the case of pen nibs for writing instruments, in order to deal with various inks with different viscosities, a. By changing the pen tip diameter, you can increase or decrease the diameter cross-sectional area of the ink passage.
B. The diameter cross-sectional shape of the ink passage is modified.

By the way, with the previous item A, by changing the stretching ratio from the forming die, it is possible to form pen nibs with various diameter cross-sectional areas of the ink passages, but if the viscosity of the ink is low, the pen nib has a small diameter. On the other hand, if the viscosity of the ink is high, the diameter of the pen tip must be large, and there is a restriction that the diameter of the pen tip and the diameter cross-sectional area of the ink passage are in a proportional relationship.

In the latter method (b), by devising the cross-sectional shape of the diameter without changing the diameter, it is possible to form a pen nib that can handle a wide variety of inks. In order to obtain the diameter cross-sectional area, the pen nib diameter must be the same as the designed diameter, and the pen nib diameter is still specified.In the end, the pen nib diameter and the diameter cross-sectional area of the ink passage are in a proportional relationship. There is a limit to what happens.

In other words, in the conventional method, the problem is how to shape and extrude a pen tip from a die designed to have an optimal diameter cross-sectional area and groove width for each ink, and to shape the pen tip into a diameter cross-sectional shape that matches the shaping opening. There was a restriction that it was not possible to form anything other than those in which the diameter of the pen tip and the diameter cross-sectional area of the ink passage were configured in a proportional relationship from the shaping opening.

(Problem to be Solved by the Invention) The problem to be solved by the invention is that it is impossible to mold anything other than a pen tip whose diameter and the diameter cross-sectional area of the ink passage are in a proportional relationship.

(Means for Solving the Problems) In order to solve the above-mentioned problems all at once, the present invention provides dedicated melt speed adjustment holes in the bottom surfaces of the contour shaping opening and the rib shaping opening in the shaping opening having air holes. These dedicated melt speed adjustment holes are used to control each melt on the contour shaping opening side and the rib shaping opening side, and adjust the melt flow speeds from the same speed to different speeds to achieve the desired diameter cross-sectional area and groove. It is characterized in that it is manufactured by extrusion after being shaped into a diametrical cross-sectional shape with an ink passageway of the same width.

Further, in the present invention, the melt speed on the contour shaping opening side and the rib shaping opening side can be adjusted by modifying the diameter or length of the melt speed adjusting hole in the die, or by modifying the diameter or length of the melt speed adjusting hole in the die. This is done by selecting a plurality of dies with different diameters or lengths.

(Function) Adjust the melt flow velocity using the melt speed adjustment holes dedicated to the outer contour shaping opening and the rib shaping opening, that is, fix the melt flow velocity in either the contour shaping opening or the rib shaping opening and reduce the melt flow velocity in the other from a low speed. By sequentially adjusting the melt flow velocity from the same speed to high speed, or by sequentially adjusting the melt flow velocity of the contour shaping opening from low speed to high speed, and sequentially adjusting the melt flow velocity of the rib shaping opening from high speed to low speed, from the shaping opening,
Since the ink flow conductor has a diameter cross-sectional shape in which the ribs are enlarged against the thin exterior and the cross-sectional area and groove width of the ink passage are small, both the outer shell and the ribs are approximately the same shape as the diameter cross-section of the shaping opening, and the ink passage has a small cross-sectional area and groove width. We can freely shape and press ink flow conductors with a diametrical cross-sectional shape that has an intermediate cross-sectional area and groove width, and ink flow conductors with a cross-sectional shape that has a large ink passage cross-sectional area and groove width because the ribs are reduced relative to the thick outer shell. I can put it out.

Thereby, it is possible to freely mold the pen tip diameter and the diametric cross-sectional area of the ink passage to have an appropriate ratio relationship.

(Example) Regarding an example of implementing the present invention, first, a manufacturing apparatus for implementing the present invention will be described.

FIG. 1 shows a device for a writing instrument nib as an example of the above-mentioned manufacturing device, and the die A has a built-in screw (not shown), and the powder and particles falling from the hopper (not shown) are The synthetic resin, such as the resin, is transferred from the melt reservoir _B1 to the flow rate control section B.
During this transfer, the die A is heated from the outside with a heater (not shown) and the synthetic resin is melted while being transferred.

In addition, the die A is provided with an air blowing pipe A ₁ and an air feeding path A ₂ that communicates with this blowing pipe, and the air feeding path is passed through the center of the flow rate control section B and the center of the injection section D. Then, air holes are formed on the injection surface.
Open A ₃ . Air blowing pipe A ₁ and air supply path A ₂
This is to prevent the synthetic resin from concentrating in the center by supplying air and blowing it out from the air hole _A3 during the stretching process during pen nib manufacturing, thus forming a nib E without a core in the center. I'll do what I do.

The die main body A has a shaping opening C formed in the front part, that is, the injection surface, which communicates with the melt reservoir _B1 at the rear via the flow rate control part B. This shaped opening C includes a roughly pipe-shaped outer shaped opening _C1 coaxial with the air hole _A3 , and a plurality of rib shaped openings C extending independently from each other in the direction of the air hole _A3 at the center. ₂ , and these openings C ₁ and C ₂ are subdivided into multiple melt shaping passages 1 that communicate with each other. The melt shaping passage 1 has a diameter gradually decreasing from the outside toward the center. However, the present invention is not limited to this, and the diameter may be large in the middle.

The flow rate control unit B is interposed between all the melt shaping passages 1 and the melt pool B ₁ to communicate them, and is a melt speed adjustment unit that controls the melt flow velocity ratio in the contour shaping opening C ₁ and the rib shaping opening C ₂ . This melt speed adjustment hole is a contour opening.
The melt shaping passage 1 in C ₁ is designated as the melt speed adjustment passage B ₂ , and the melt shaping passage 1 in the rib shaping opening C ₂ is designated as B ₃ . The relationship is set to a small diameter in consideration of the melt balance phenomenon. Moreover, the cross-sectional diameter ratio relationship between the melt speed adjustment holes B ₂ and B ₃ and the melt shaping passage 1 is such that the melt flow speeds in the contour shaping opening C ₁ and the rib shaping opening C ₂ are controlled to be the same, respectively. , the same number of melt-forming passages 1 are drilled, although their diameters vary.

The melt speed adjustment holes B ₂ and B ₃ control the melt flow rate ratio according to the diameter cross-sectional area and groove width of the ink passage E ₁ of the pen nib E to be molded.
Specifically, when molding a pen nib with a small diameter cross-sectional area and groove width of the ink passage, the outer shaping opening C ₁
The diameter of the melt speed adjustment hole B ₂ in the rib shaping opening C 2 may be increased or the diameter of the melt speed adjustment hole B ₃ in the rib shaping opening C ₂ may be increased or the hole length may be increased as shown in FIG. 3. Shorten the hole length as shown in the diagram to create an outer contour opening C ₁
Adjust the ratio so that the melt flow velocity at the rib shaping opening _C2 is faster than the melt flow velocity at the rib shaping opening C2.

In addition, when molding a pen nib with a large diameter cross-sectional area and groove width of the ink passage, the diameter of the melt speed adjustment hole _B2 in the contour shaping opening _C1 should be increased, or the hole length should be changed as shown in Fig. 7. While reducing the diameter of the melt speed adjustment hole _B3 in the rib shaping opening _C2 , or increasing the hole length as shown in the same figure, the melt flow velocity in the outer contour shaping opening _C1 can be adjusted to the same value as the rib shaping opening. Adjust the ratio to be faster than the melt flow rate of _C2 .

In addition, when molding a pen nib with an intermediate cross-sectional area and groove width of the ink passage, the melt speed adjustment holes B ₂ and B ₃ of the outer contour shaping opening C ₁ and the rib shaping opening C ₂ should have the same diameter. Alternatively, the melt flow speeds in both openings C1 _{and C2} are adjusted to be the same speed by adjusting and managing the hole diameter and hole length, such as making the hole lengths the same as shown in FIG.

With such a device, melt speed adjustment hole _B2 and
B ₃ controls the melt flow velocity ratio between the contour shaping opening C ₁ and the rib shaping opening C ₂ so that the radial cross-sectional shape has the basic shape of the radial cross-sectional shape of the shaping opening C, and the ink passage E ₁ From the pen nib E (Fig. 4) with a small diameter cross-sectional area and groove width, to the pen nib E (Fig. 8) with a large diameter cross-sectional area and groove width of the ink passage _E1 (Fig. As shown in the figure, it is possible to freely extrude a pen nib E having an ink passage _E1 of a desired diameter cross-sectional area and groove width.

In addition to the above embodiments, the pen nibs that can be molded by the manufacturing method of the present invention include pen nibs with all diameter cross-sectional shapes having a ring-shaped outer contour E ₂ and a rib E ₃ .
For example, if the ink wetted surface of the ink passage E ₁ is in _the form of a series of circular arcs as shown in Fig. 4, or in a smooth form as shown in Figs. A type in which the rib _E3 is formed by a partition wall extending toward the center and branch walls extending from one side or left and right sides of this partition wall (Fig. 12), and a type in which the ends of the branch walls face diagonally to each other. ,
The diametrical cross-sectional area and groove width of the ink passage, including pen nibs with various diametrical cross-sectional shapes, such as pen nibs in which the branch wall enters in an intersecting manner leaving a gap between the ink passages, and pen nibs with appropriate combinations of the above elements, etc. can be formed to a desired value.

Further, it is also possible to form a pen nib having a diametrical cross-sectional shape that has an ink wetting path E ₄ inside the outer shell E ₂ and the surface of the nib is colored ink color by the path.

The molding die A shown in FIG. 9 shows an example of extrusion molding the pen nib E having the radial cross-sectional shape shown in FIG. 10, and the molding die A shown in FIG. An example of extrusion molding is shown, and both melt speed adjustment holes B ₂ and B ₃ are shown.
By controlling the melt flow velocity ratio in the contour shaping opening C ₁ and the rib shaping opening C ₂ , it is possible to freely extrude a pen nib in which the diameter cross-sectional area and groove width of the ink passage E ₁ are the desired values. It is.

In the embodiments described above, the melt flow rate can be easily controlled by controlling the pore diameter in a large manner and controlling the pore length in a subtle manner.

(Effect of the invention) By adjusting the melt flow velocity ratio on the contour shaping opening side and the rib shaping opening side to be the same speed or different speed with the melt speed adjustment hole that also manages those melts, the pen tip diameter and It is possible to freely form ink passages with appropriate ratios of cross-sectional area, the diameter is the desired diameter, the thickness of the outer shell is thin to thick, and the cross-sectional area of the ink passage and groove width are small. It is possible to freely manufacture ink flow conductors with desired numerical values, from small to large.

While obtaining the desired diameter, the diameter cross-sectional area and groove width are suitable for various types of ink, such as low viscosity ink, medium viscosity ink, high viscosity ink, pigment ink, paint ink, etc. The ink passage can be freely formed.

Roughness of the wall surface forming the ink passage does not occur even under extremely high extrusion pressure or extremely high drawing speed and molding speed, and a smooth wall surface that is not disadvantageous to ink flow can be manufactured.

Since the ink flow conductor is self-adhesive within the die, the cooling rate of the ink flow conductor is slow, the degree of crystallinity is high, and thermal strain is small.

Since the ink fluid is integrally molded within a die, weld lines are not generated at various locations in the radial cross section of the ink fluid, and there are no cracks that can cause a decrease in strength.

By extruding it into a tubular shape and controlling the cooling of its interior, that is, the ink passage surface, it is possible to manufacture a product with a desired controlled ink wetting surface.

[Brief explanation of the drawing]

FIG. 1 is a front view showing one embodiment of the apparatus adopted to carry out the method for manufacturing a synthetic resin ink flow conductor of the present invention. FIG. 2 is a longitudinal sectional side view taken along the - line in FIG. 1. Figure 3 is a vertical side view of the molding die with the melt speed adjustment hole adjusted to enable the production of the pen nib shown in Figure 4, and Figure 4 is an enlarged view of the diameter cross section of the nib manufactured using the same molding die. Cross-sectional view. Figure 5 is a longitudinal side view of the molding die with the melt speed adjustment hole adjusted to enable the production of the pen nib shown in Figure 6, and Figure 6 is an enlarged view of the diameter cross section of the nib manufactured using the same molding die. Cross-sectional view. Figure 7 is a vertical side view of the molding die with the melt speed adjustment hole adjusted to enable the production of the pen tip shown in Figure 8;
The figure is an enlarged sectional view showing a radial cross section of a pen nib manufactured using the same molding die. 9 and 11 are front views showing an example of another molding die capable of implementing the manufacturing method of the present invention, and FIG. 10 is an enlarged cross-section showing a radial cross-section of a pen nib manufactured by the molding die of FIG. 9. figure.
FIG. 12 is an enlarged sectional view showing a radial cross section of a pen nib manufactured by the molding die shown in FIG. 11. In the figure, A is the molding die, A ₃ is the air hole, B ₂ , B ₃
is the melt speed adjustment hole, C is the shaping opening, C ₁
is the outer shaped opening, C ₂ is the rib shaped opening, E is the pen tip, and E ₁ is the ink passage.

Claims (1)

[Claims] 1 Dedicated melt speed adjustment holes are provided on the bottoms of the contour shaping opening and rib shaping opening in the shaping opening having air holes, respectively, and these dedicated melt speed adjustment holes adjust the melt flow velocity on the contour shaping opening side and the rib shaping opening side. Adjust from the same speed to different speeds,
A method for producing an ink flow conductor made of synthetic resin, which comprises shaping the ink flow conductor into a diameter cross-sectional shape with an ink passage having a desired diameter cross-sectional area and groove width, and then extrusion molding.