JPS6178696A - Manufacture of ink flow conductor made of synthetic resin - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention can be used as a flow medium for a variety of inks depending on the application, such as a pen tip for a writing instrument, or an ink delivery pipe between an ink storage body and a brush tip. The present invention relates to a method for manufacturing the ink fluid used.

(Prior art) In the case of pen nibs for tα marking instruments, in order to handle various types of ink with different viscosities, the diameter of the ink passage may be increased or decreased by changing the diameter of the nib, or The diametrical cross-sectional shape of the

(Problem to be Solved by the Invention) As for (2), it is possible to mold pen nibs with various diameter cross sections by changing the stretching rate from the molding die, but without changing the diameter, the diameter of the ink passage The pen nib that cannot increase or decrease the cross section fi1 and can handle a wide variety of inks with the same diameter is manufactured by X.
iIt's impossible.

■ By changing the diameter cross-sectional shape without changing the diameter, it is possible to mold a pen nib that can handle a wide variety of inks, but the number of molding dies corresponding to the number of changes in the diameter cross-sectional shape is This is essential, and it is necessary to prepare the same number of molding dies as the number of deformations of the diameter foi surface shape, that is, the number of ink types. This is the reason why it is not possible to reduce costs.

In other words, in the conventional method, the problem is how to shape and extrude the pen tip from a die designed to have the optimum diameter cross-sectional area and groove width for each ink into a C1rg surface shape that matches the shaping opening. From the shaping opening of the shape, the diameter is the same diameter and the diameter cross-sectional shape is basically common, and the diameter cross-section of the ink passage and the groove width are different values suitable for each ink. (Means for Solving Problem I28) The present invention aims to solve the above-mentioned problems all at once. Dedicated melt speed adjustment holes are provided, and each melt in the contour shaping frontage and rib shaping frontage is managed one by one using these dedicated melt speed adjustment holes.
The melt flow rate is adjusted to a constant rate to a true rate, and the melt is shaped into a diametrical cross-sectional shape having a desired cross-sectional shape and a medium ink passage, and then extrusion production is carried out.

(Function) Each melt is controlled one by one with each melt speed adjustment hole.
Then, the melt flow speed is adjusted using the dedicated melt speed adjustment holes: J4 adjustment, that is, fixing the melt flow speed of either the outer contour shaping opening or the rib shaping opening, and sequentially adjusting the melt flow velocity of the other from low speed to the same speed to high speed. Alternatively, if the melt flow velocity of the outer contour shaping opening is adjusted sequentially from low speed to ig speed 1J, while the melt flow velocity of the rib shaping opening is adjusted sequentially from high speed to low speed, the rib expands from the shaping opening with respect to the outside of the inner envelope. From an ink flow conductor having a diameter cross-sectional shape with a small ink passage cross-sectional area and groove width, to an ink flow conductor having a diameter cross-sectional shape that is almost the same as the diameter cross-section of the shaping opening for the outer shell and ribs, and an ink passage cross-sectional area and groove width that are intermediate. Inner flow conductor with a certain diameter cross-sectional shape,
Then, the ribs are reduced relative to the thick outer shell, and the ink flow conductor is freely shaped and extruded into an ink flow conductor having a diameter cross-sectional shape in which the cross-sectional area of the ink passage and the groove width are large.

(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 writing instrument nib device as an example of the above-mentioned HA manufacturing device, in which die A has a built-in screw (not shown), and powder-like powder falling from a hopper (not shown), The synthetic resin in the form of particles is transferred from the melt reservoir B1 to the flow controller B. During this transfer, the die A is heated from the outside with a heater (not shown) to melt the synthetic resin. Transfer while doing so.

In addition, when the die A is provided with an air blowing pipe A1, the tool is provided with an air passage 2 that communicates with this blowing pipe, and the air passage is connected to the center of the flow f1 control 2II part B and the center of the injection part. , and open the air hole A3 on the injection surface. The purpose of the air blowing pipe A1 and the air supply path A2 is to prevent the synthetic resin from concentrating on the center by supplying air and blowing it out from the air hole 3 during the drawing process during pen nib manufacture. A pen nib E without a hole is formed.

A shaping opening C is formed in the front part, that is, the injection surface of the die body, communicating with the melt pool B1 at the rear via the flow 0υ1 curved part B. This shaping opening C has a generally pipe-shaped outer shaping opening C1 that is concentric with the air hole A3, and a rib shaping opening C2 having a number of Tl extending from the inside of this in the direction of the air hole A3 at the center independently of the direction η. These openings C1 and C2 are subdivided into a plurality of melt shaping passages 1 which 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.

Flow φai (J (IT part B is interposed between all the melt shaping passages 1 and the melt pool B1 to communicate them, and controls the melt flow velocity ratio J5 between the contour shaping opening C1 and the rib shaping opening C2. This is a melt speed adjustment hole, and the melt shaping passage 1 in the outer contour shaping opening C1 is referred to as the melt speed adjustment passage B, and the melt shaping passage 1 in the rib shaping opening C2 is not shown as B3. However, the relationship between all of these melt shaping passages 1 and the melt shaping passage 1 is defined as a small diameter with the melt balance phenomenon rJFli.In addition, each melt speed adjustment hole B2 and B3 and the melt shaping passage 1 The cross-sectional diameter ratio relationship between them is to control the melt flow velocity in the contour shaping opening C1 and the rib shaping opening C2 to be the same. be done.

The melt speed adjustment holes B2 and 83 control the melt flow rate ratio according to the desired area and groove width of the ink passage E1 of the pen nib E to be molded. Specifically, when molding a pen nib with a small ink passage area and small groove width, the melt speed adjustment hole B in the contour shaping opening C1
2, the diameter of the melt speed adjustment hole B3 in the rib shaping opening C2 can be increased, or the hole length can be increased as shown in the same figure. The melt flow rate in the rib shaping opening C2 is adjusted to a ratio where the melt flow velocity in the rib shaping opening C2 is faster than the melt flow velocity in the contour shaping opening C1.

In addition, when molding a pen nib with a large ink passage area and groove width, 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. While shortening it, the diameter of the melt speed adjustment hole B3 in the rib shaping opening C2 is made smaller, or the length of the hole is made longer as shown in the same figure, and the outline shaping ti1 is
The melt flow velocity in the opening C1 is adjusted to a higher ratio than the melt flow velocity in the rib shaping opening C2.

In addition, when forming a pen nib with an intermediate ink passage area and groove width, the outer contour shaping opening C1 and the rib shaping opening C2
The diameter and length of the melt speed adjustment holes B2 and B3 are adjusted to be the same, or the hole length is the same as shown in FIG. The melt flow rate in C2 is adjusted to the same rate.

With such a device, the melt flow velocity ratio between the contour shaping opening C1 and the rib shaping opening C2 is controlled by the melt speed adjustment holes B2 and B3, so that the radial cross-sectional shape has the basic shape of the radial cross-sectional shape of the shaping opening C. Then, from the pen nib E (FIG. 4) whose ink passage E1 has a small diameter cross-sectional area and groove width, to the pen nib E (Fig. 8) whose ink passage E1 has a large desired area and groove width.
(Fig. 6), the pen nib E is freely extruded to the right of the ink passage E1 of a desired predetermined area and i+4 width up to the pen nib E (Fig. 6) which is between the two.

In addition to the above-mentioned embodiments, the manufacturing method of the present invention is applicable to pen nibs of all diameter cross-sectional shapes having a ring-shaped outer 93E and a second rib E3, such as an ink passage E1. The ink-wetted surface of the ink-wetted surface is shaped like an arc as shown in FIG. 4, or is smooth as shown in FIG. 10 J3 and FIG. a partition wall extending in the center direction, and a retaining wall extending from one side or left and right sides of the partition wall (Fig. 12);
The desired area of the ink passage and the grooves can be adjusted to various diameter cross-sectional shapes, such as those in which the retaining wall enters the ink passage in an intersecting manner, and those in which each of the above elements are appropriately combined. The width can be molded to a desired value.

Further, it is also possible to form a pen nib having a radial cross-sectional shape that has an ink wetting path Ea inside the outer shell E2 and whose surface is colored ink color by a circuit.

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 8 shown in FIG. This shows an example of extrusion molding, and by controlling the melt flow velocity ratio in the contour shaping opening C1 and the rib shaping opening C2 with the melt speed adjustment hole B2 and 83, the desired area of the ink passage E+ and Man 11-J
It is capable of being freely extruded into a pen nib with Av1m.

In the above example, the melt flow rate ill rjl+ is a large adjustment that intensively controls the pore diameter, and is delicate: J4m intensively controls the pore length. This can be easily achieved by leaning.

(Effects of the invention) ■ The melt flow velocity ratio in the outer contour shaping opening and the rib shaping opening () of each melt in the main pipe is 1! I! Melt Speed FJJ! ! By adjusting the speed between the same speed and different speed using the holes, the desired value can be obtained from small to large ink passage area and groove width with the same diameter and basically the same cross-sectional shape. Ink flow conductors can be freely manufactured.

■ With the same diameter, the required area and area suitable for each type of ink, such as low viscosity ink, medium viscosity ink, high viscosity ink, pigment ink, paint ink, etc. The ink passage in the groove width can be made freely.

■ It is only necessary to control the melt speed adjustment hole wA with one molding die, and the manufacturing cost is low.

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

(2) Since the ink fluid has an internal die opening, the cooling/Jl speed of the ink fluid is slow, the degree of crystallinity is high, and the thermal strain is small.

- Since the ink fluid is integrally molded within a die, there are no weld lines at various locations in the diametrical cross section of the ink fluid, and there are no cracks that can cause a decrease in strength.

(2) Since it is extruded into a tubular shape and the inside thereof, that is, the ink passage surface, is controlled to be cooled, it is possible to manufacture an ink-wetting surface with limited constriction*1.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an embodiment of an apparatus adopted for carrying out the method of manufacturing a synthetic resin ink passage surface of the present invention. Second
The figure is a longitudinal side view taken along the ■-■ line. Figure 3 is a vertical side view of the forming die with the melt speed adjustment hole adjusted to the production port I function of the pen nib shown in Figure 4, and Figure 4 is a diametric cross-section of the nib manufactured by the same forming die. FIG. Figure 5 shows the vertical shape of the molding die [11i fi1
FIG. 6 is an enlarged sectional view showing a radial cross section of a pen nib manufactured by the same molding die. 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 nib shown in Figure 8, and Figure 8 is an enlarged view of the diameter cross section of the nib manufactured using the same molding die. Cross-sectional view. Figures 9 and 11 are front views showing an example of another molding die that can carry out the manufacturing method of the present invention, and Figure 10 shows a diametric cross section of a pen tip made by the molding die of Figure 9. An enlarged sectional view shown. 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 forming die, A3 is the air hole 82, B3 is the melt speed adjustment hole, C is the shaping opening, C1 is the outer shaping opening, C2 is the rib shaping opening E (the pen nib, and El is the ink passage patent).
Applicant: Representative of Thibaut Co., Ltd.
Masa Hayakawa N1. -1 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] Dedicated melt speed adjustment holes are provided on the bottoms of the contour shaping opening and rib shaping opening in the shaping opening that has air holes, and these dedicated melt speed adjustment holes keep the melt flow speed in the contour shaping opening and the rib shaping opening at the same speed. A method for producing a synthetic resin ink flow conductor, which comprises adjusting the ink flow conductor to have different speeds, shaping it into a diameter cross-sectional shape having an ink passage having a desired diameter cross-sectional area and groove width, and then extrusion molding.