JPS6139919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an ink core for a so-called felt-tip pen, which has a cylindrical shape with openings at both ends and is filled with synthetic resin crimped fibers that act as an ink absorber.

By the way, conventional ink cores include a method in which the outer skin or cylinder is extruded from synthetic resin, and a method in which waterproof paper such as cellophane is rolled into a cigarette-like shape, and the former naturally has poor mechanical strength. It should be said that it is ideal because it is expensive and there is no fear of ink leakage, but unfortunately it has the drawbacks of being expensive due to the material and poor productivity.On the other hand, in the latter case, simply wrapping waterproof paper However, unlike the former, it has the disadvantage of poor mechanical strength, which is difficult to avoid.

Therefore, in the present invention, the purpose of the present invention is to use the above-mentioned cigarette roll-shaped manufacturing method to obtain a core that is substantially equivalent in strength to that produced by the above-mentioned extrusion method.However, in order to increase the strength, the material of the outer shell is Inevitably, a hard material must be used, but this means that the material has to be rolled up against its resilience.
Continuous high-speed winding formation is completely impossible.

Therefore, in the present invention, a hard material is used as the outer skin material, but in particular, creases are added to this material in advance to prevent the restoring action of the material from working, thereby enabling high-speed continuous production of the core. It is to do so.

The details of the embodiment will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a relatively thick and hard paper strip-shaped shell material whose surface is coated with resin and which is continuously fed out from a cigarette winding machine (not shown).
There are 2 creases in the longitudinal direction on one or both sides of this material 1.
Several lines are provided in parallel and at regular intervals.

A known crimped short fiber bundle 3 made of synthetic resin, which is also continuously fed out, is placed parallel to the surface of the outer skin material 1, and in this state, the outer skin material 1 is folded using a known cigarette winding machine (not shown). The fiber bundle 3 is bent into a cylindrical shape via the striations 2, and the fiber bundle 3 is wound and loaded, and both end edges of the outer skin material are overlapped and heat fused (adhesion may also be used).
Then, this is cut to a predetermined length that fits the felt pen shaft to obtain a center core A having a rectangular cylindrical cross section with both ends open as shown in FIG.

Then, by inserting the obtained core A into the pen shaft 4 as shown in FIG. 3, an air passage 5 necessary for ink secretion is created between the inner wall of the pen shaft and the outer surface of the core.
Of course, a is formed.

As described above, according to the present invention, it is possible to easily obtain a core having mechanical strength equivalent to that of a core formed by conventional extrusion molding, and even though the outer skin material is hard, it is possible to easily obtain a core having mechanical strength equivalent to that of a core formed by conventional extrusion molding. Due to the presence of folding lines, the outer skin material can be easily bent, making it possible to roll the material at high speed using a cigarette winding machine, which is an important feature that facilitates the production of cores in a highly efficient manner. It is something.

On the other hand, since the core obtained by the method of the present invention has a rectangular cylindrical cross section, when it is inserted into a pen barrel whose inner surface is cylindrical, an air passage is naturally created between the outer periphery of the core and the inner surface of the pen shaft. It has ancillary effects that can be created.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the manufacturing process, FIG. 2 is an end view of the manufactured core, and FIG. 3 is a sectional view of the core inserted into the pen barrel.

Claims (1)

[Claims] 1. In a method for producing ink cores using a cigarette winding machine, a flat outer shell material is used in which several creases are provided in advance in parallel and at equal intervals, and this outer shell material is unfolded and then stretched on its surface. A well-known synthetic resin crimped fiber bundle is placed, the outer skin material is bent into a cylindrical shape through the creases, the fiber bundle is wound and packed inside, and both ends of the outer skin material are polymerized and bonded. A method for manufacturing ink cores for felt pens.