JPS61177921A - Fishing line of fishing tool - 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 relates to a line guide for guiding line in fishing and the like.

[Conventional technology and problems]

Conventionally, as this type of thread guide, a thread guide made of an annular body made of alumina ceramics has often been used instead of the conventional one made of stainless steel or ceramics.

However, alumina ceramics originally have a polycrystalline structure in which the crystal bonding strength is relatively low because each crystal is bonded to each other by the grain boundaries existing between the crystals. Therefore, after sintering, when the surface in contact with the yarn is polished to a mirror finish, fine alumina crystals are likely to be lost, and a surface with a sharp angle is formed where the crystals are missing. Furthermore, since there are many voids throughout the crystals and grain boundaries, there is a limit to the ability to achieve a mirror-like finish with smooth ribs, even if mirror-finishing is applied. Therefore, a thread path made of alumina ceramics still scrapes off a portion of the thread passing through it, or scratches the surface, resulting in a premature decline in the strength of the thread.

Moreover, although alumina ceramics have excellent compressive strength, they have the disadvantage of being susceptible to cracking when subjected to impact from being dropped carelessly, and have poor toughness.

[Means for solving problems]

In view of the above, we selected a variety of wear-resistant ceramics that have a polycrystalline structure with extremely few voids on the surface and less loss of microcrystals even when mirror-finished after sintering. The thread guide for fishing gear is made of zirconia ceramic, and in particular partially stabilized zirconia absorbs external stress and transforms into martensitic material, thereby causing less cracking and damage due to external stress.

〔Example〕

Figure 1 shows the most commonly used ring-shaped body that forms a line guide for fishing gear.
(not shown), and various outer diameters r are used depending on the location and purpose of use.

We formed such annular bodies with the same shape (inner diameter 25 fl) and surface condition using conventional stainless steel, ceramic, alumina, zirconia, and silicon nitride materials, and measured the coefficient of dynamic friction, which is an important factor for thread guides. . The results are shown in Table 1, and the method for measuring the coefficient is as shown in Figure 2, when the thread S runs while touching the guide surface G of the test piece, the running thread S touches the guide surface G. Due to the frictional force generated by contacting G, the tension T2 on the exit side of the thread S increases with respect to the attractive force TI on the entry side. For this reason,
The following relationship exists between the attractive force T1 and the tension T2 according to "Ag*onton's law".

T 2 =T 1 e7″' where μ: Coefficient of friction to be measured 28541 Surface wrapping angle From this relational expression, the coefficient of friction μ of the test piece made of each material was calculated.

Moreover, the surface roughness and measurement conditions of each test piece P are as follows.

Surface roughness of test piece O, S Attractive force on the S entering side
20g Traveling speed 80m/S Curvature of guide surface 0.600 Room temperature 25℃ Winding angle 90℃ Thread thickness Polyester 75 denier From this table 1, zirconia ceramic is superior to conventional construction materials such as ceramics and alumina ceramics. It turned out that the material did not have such a small coefficient of friction.

Next, test products of annular bodies with an inner diameter of 20 mm were made from the various materials mentioned above, and a test was conducted in which they were caused to run in contact as shown in FIG. As the fishing line used in the test, 300 m of 5-tatami thread made of nylon was brought into sliding contact at a speed of 8 Ont/S with an annular body as a test product made of various materials. In this case, the inner peripheral surface of the annular body (the test results are shown in Table 2).

As can be seen from this result, the annular body made of zirconia ceramics had the second smallest amount of wear on the fishing line after the one made of alumina. Moreover, the roughness of the yarn surface was kept small, and the abrasion powder of the yarn did not adhere to the portion where the yarn made sliding contact. Furthermore, the resistance strength of alumina is 4000kg/cd.
150 for zirconia ceramic
It is extremely large at over 00 kg/cj, and has considerably high toughness, strength, and corrosion resistance, so it will not crack or break.

In addition, as a result of repeated various tests, the curvature R of the guide surface G of the annular body as a thread guide made of zirconia ceramic was found to be approximately 6 to 0.2.Furthermore, the surface roughness of the guide surface G was A ring smaller than IS is preferable, and the size of the annular body varies depending on the location of use, but a ring with an outer diameter of 5 to 40 mm is most versatile.

In addition, as the zirconia ceramic, zirconia ZrO
, a partially stabilized zirconia ceramic containing Littoria (YJ-03), calcia (CaO), magnesia (MgO), etc. as a sintering aid is used, but since this ceramic has a milky white color, it may be used as a sintering aid. A mixture of carbon (C) and metal oxides and colored black or gray can also be used as a thread guide.

〔Effect of the invention〕

As described above, since the yarn path of the present invention is made of zirconia ceramic, it has high strength and can provide a yarn path with excellent sliding properties without causing yarn wear.

[Brief explanation of drawings]

FIG. 1(a) is a perspective view of an annular body constituting a thread path according to the present invention, and FIG. 1(b) is a sectional view taken along the line X--X in FIG. 1(a). FIG. 2 is a side view schematically showing a method for measuring the coefficient of dynamic friction, and FIG. 3 is a side view schematically showing a method for abrasion test of thread S using an annular body. L: Annular body S: Thread

Claims (1)

[Claims] The curvature R of the part where the fishing line passes is 6~0.2, and the outer diameter is 5~
A thread guide for fishing gear, which forms a 40 mm annular body, and the annular body is made of zirconia ceramic.