JPS5825411B2 - How to make fishing string - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides fishing methods that can be carried out by hand fishing deep under the sea, for example 100 meters below the sea surface.
The present invention relates to a method of manufacturing a fishing line that can be hung down to catch fish.

In general, fishing strings that are used while hanging deep in the sea are subject to large tensions due to various factors, so they must be strong. Fishing strings are used in which a polyurethane resin coating 2 is formed around the outer periphery of a core material 1 having high tensile strength, which is made by twisting together aromatic polyamide threads.

However, this fishing line has a core material 1 which has an extremely high tensile strength and is strong, and has a non-water-absorbing polyurethane resin coating 2 on the outside. This can effectively prevent water from entering and adhering to the twisted voids and increasing the weight of the fishing string. However, conventional fishing strings with this polyurethane resin coating 2 simply have Since the polyurethane resin was simply extruded and formed on top of No. 1, the surface of the resulting fishing string was smooth, and therefore, this fishing string was very slippery when the surface got wet with water. However, when fishing by hand, the fishing line slips and is difficult to pull up, and in other cases, the fishing line itself is extremely slippery, making it difficult to handle.

In order to eliminate this drawback, the uncured polyurethane resin coating that has just been extruded onto the core material is run through an ultrasonic vibrating die, thereby creating uneven surfaces with large friction on the surface of the polyurethane resin coating. A method for manufacturing fishing strings has been developed in which a rough surface is formed. However, in this method, an expensive ultrasonic vibrating die device is used to form the rough surface, resulting in high manufacturing equipment costs. This caused a problem in that the price of the product soared.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a novel fishing line manufacturing method that can efficiently and inexpensively manufacture a fishing line having a non-slip coated surface. It is.

Hereinafter, a method according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. The core material 1 fed out from the delivery bobbin 3 is put into an extruder 5 while being given an appropriate tension by a tension device 4. A polyurethane resin is extruded and coated onto the core material 1 to a predetermined thickness while the core material 1 is passed through the extrusion head 6 at a constant speed.

Subsequently, while the polyurethane resin coating 2 extruded onto the core material 1 is passed through an air blowing die 8 attached to the exit end face of the molding die 7, the injection port 8a of the air blowing die 8 is Compressed air is blown onto the surface of the polyurethane resin coating 20 to roughen the surface and form fine irregularities.

This air blowing die 8 has a compressed air inlet 8b inside.
An air chamber 8c communicating with the air chamber 8c is formed, and a large number of injection ports 8a described above are radially bored in the peripheral wall of the inner annular body.

In this embodiment, the wall surface of the inner annular body of the air blowing die 8 is formed into a concave curved surface when viewed from the side cross-sectional direction (FIG. 3), and a space 9 is formed between it and the surface of the polyurethane resin coating 20. , a jet flow of compressed air is generated appropriately, and the air is distributed between the wall end 8d of the inner annular body of the air blowing die 8 and the polyurethane resin coating 2.
It escapes to the outside through the gap between the surface and the surface.

Subsequently, the polyurethane resin coating 2 is introduced into a cooling water tank 10, cooled and hardened, and then passed through a take-up machine 11 and wound up by a wind-up machine 12.

In this way, as shown in FIG. 5, a fishing line having a polyurethane resin coating 2 with a finely uneven surface 13 is manufactured.

Although not shown, a pressure regulating valve is provided in the compressed air supply line leading to the compressed air inlet 8b, and by operating this valve to change the injection pressure, the degree of roughness of the coating surface can be adjusted. Can be controlled freely.

FIG. 6 shows another example of an apparatus for carrying out the method of the present invention. In this example, the center portion of the tip surface of the forming die 7I is projected in a truncated conical shape. A slit-shaped injection port 8'a inclined forward is formed between 'a' and the front wall 8'e of the air blowing die 8'.

Note that 8'b is a compressed air inlet, and 8'c is an air chamber.

As explained above, according to the present invention, by simply passing the uncured polyurethane resin coating extruded onto the core material made of polyamide yarn through an air blowing die that blows out compressed air, the polyurethane Because it is possible to form a finely uneven rough surface on the surface of the resin coating, unlike the conventional method using an ultrasonic die device, it is possible to create a fishing line with a coated surface that has high friction and does not slip, which requires high equipment costs and expensive equipment. It can be manufactured efficiently and at low cost without requiring any equipment.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional fishing line, FIG. 2 is a side view showing an example of an apparatus for carrying out the fishing line manufacturing method of the present invention, and FIG.
The figure is an enlarged partial cross-sectional view of the main part in Figure 2, Figure 4 is a cross-sectional view taken along the line v-v in Figure 3, Figure 5 is an external view of the fishing line manufactured by this manufacturing method, and Figure 6 FIG. 2 is a cross-sectional view of main parts showing another example of an apparatus for carrying out the present invention. 1... Core material, 2... Polyurethane resin coating, 6... Extrusion head, 7... Molding die, 8... Air blowing Dice, 8a...
... Injection, 8c... Air chamber, 13.
...Rough, uneven surface.

Claims (1)

[Claims] 1 After continuously extruding and coating the outer periphery of a core material made of multiple twisted polyamide threads with polyurethane resin,
A method for manufacturing a fishing line, which comprises passing the extruded uncured polyurethane resin coating through an air blowing die having an air chamber formed therein to form fine irregularities on its surface.