JPH01221294A - Pen point for liquid writing implement - Google Patents

Abstract

PURPOSE:To obtain satisfactory quality in terms of not only wear resistance and strength but the feeling of writing, by fitting an ink guide core into a pipe molded from a thermoplastic liquid crystal polymer or a composition comprising the same. CONSTITUTION:A liquid crystal polymer (100%) is extruded into a pipe form, the extrudate is cut to a required length, and the tip of the cut extrudate is polished to obtain a pipe. Then, an ink guide core molded from polyacetal to have structure in which a gap with a modified cross section opened to the exterior is provided in the axial direction is fitted into the pipe to complete a pen point. The entire body of the structure of the pipe consists of rigid molecules, with a crystal structure in which the degree of orientation and density are higher as the surface is approached, so that the pen point has excellent wear resistance at the time of writing. Molecular chains are self-reinforced by orientation in the flowing direction thereof at the time of molding the pipe to have high modulus of elasticity and strength in the direction, so that the pen point is prevented from being deformed at the tip thereof or being split at the time of writing. When a fibrous filler is added to the molding material, the strength of the structure thus obtained is further enhanced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has a structure in which a movable ink guide core is fitted inside a pipe, and has excellent wear resistance and strength. Regarding the nib of liquid writing instruments with good taste.

[Conventional technology]

In the pen nibs of conventional liquid writing instruments of this type, metals or ceramics are used as the material of the pipe. but,
Since the material of the pipe is metal or ceramics, although the strength and abrasion resistance of the pen tip were satisfactory, the 1M taste (feel of writing) was very poor and unsatisfactory. Therefore.

Although it is widely used as a drafting tool, a mechanical drawing machine, and a plotter pen, it is currently not used much as a writing instrument for handwriting.

[Problem that the invention seeks to solve]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pen nib for a liquid writing instrument that has satisfactory quality not only in abrasion resistance and strength but also in taste and is suitable for use as a writing instrument for handwriting.

[Means for solving the problem of interpolation points J] The present invention provides an ink guiding core fitted inside a pipe formed from a thermoplastic liquid crystal polymer or a blended composition containing a thermoplastic liquid crystal polymer. The above object is achieved by providing a pen nib for a liquid writing instrument characterized by the following characteristics:

Here, the material of the pipe may be 100% thermoplastic liquid crystal polymer, but if necessary, especially if high strength is desired, glass fiber, carbon fiber, etc. may be blended. There are no particular restrictions on the guide core, and for example, an ink guide core made of polyacetal and having an outer groove structure in which a gap with an irregular cross section is provided in the axial direction on the outer surface of the shaft can be used.

[Effect]

The liquid writing instrument nib obtained by the present invention has the following advantageous properties.

(1) Since the pipe is made of plastic, it has better writing quality than pipes made of glass, ceramics, various metals, etc.

(2) The entire structure of the pipe consists of rigid molecules.

The closer it is to the surface, the higher the degree of orientation and the denser crystal structure it has, so it has greater abrasion resistance during writing.

(3) When forming the pipe, the molecular chains are oriented in the flow direction and are self-reinforced, and the elastic modulus 1 strength in this direction is large, so there is no disadvantage that the tip of the pen tip deforms or breaks when writing. When a fibrous filler is added, the structural strength is significantly improved.

〔Example〕

Example 1' First, a pipe was formed by extruding 100% liquid crystal polymer into a pipe shape, cutting it to the required length, and polishing the tip so as not to impair the writing quality. The pen nib was completed by fitting an ink guiding core made of polyacetal into the pipe and having a gap in the axial direction with an irregular cross section open to the outside. Thereafter, this pen nib was assembled into a writing instrument, and an experienced evaluator conducted a sensory test of writing taste. The results are shown in the table below.

Example 2 A compounded composition containing 30% glass fiber added to a liquid crystal polymer was extruded into a pipe shape, cut to the required length, and the tip was polished so as not to impair the writing quality. A pen nib was completed by fitting an ink guiding core made of polyacetal and having a gap in the axial direction with an irregular cross section open to the outside surface formed in the inside of the formed zero pipe. Thereafter, this pen nib was assembled into a writing instrument, and an experienced evaluator conducted a sensory test of writing taste. The results are shown in the table below.

For comparison, a sensory test of writing taste was conducted under the same conditions for the conventional pen nib, and the results are shown in the table below. still,
The structure of the comparative example is as follows.

Comparative Example 1 A liquid writing instrument consisting of a pen nib in which a movable ink guide core is fitted inside a reprinted metal pipe.

Comparative Example 2 A liquid writing instrument consisting of a pen nib in which a movable ink guide core is fitted inside a commercially available ceramic pipe.

Table [Effects of the Invention] As mentioned above, the pen nib of the present invention has excellent abrasion resistance, high elastic modulus and high strength, and has a good writing feel as is clear from the above test results. The above objective is completely achieved.

Therefore, it does not have the drawback of liquid writing instruments that use normal polyacetal resin nibs, where it becomes impossible to write at short writing distances even though there is still enough ink left, and it can be used even at significantly longer writing distances. I am now able to write well. Therefore, it is extremely useful as a writing instrument used by people who use high pressure when writing, and as a pen tip for various recorders.It also has excellent abrasion resistance and has a long writing life, so the ink absorber can be replaced with a cartridge to extend the life of the writing instrument. You can also extend it. Furthermore, since it has high elastic modulus and high strength, carbon copying and non-carbon copying are also possible.

Patent applicant: Mitsubishi Pencil Co., Ltd.

Claims (1)

[Claims] A pen nib for a liquid writing instrument, characterized in that an ink guide core is fitted inside a pipe formed from a thermoplastic liquid crystal polymer or a blended composition containing a thermoplastic liquid crystal polymer.