JPH029655Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Field of Industrial Application] The present invention relates to improvement of seine fishing gear. [Prior Art] Conventionally, in this type of seine fishing gear, there is one in which a light-emitting layer that emits light by itself is formed on the sleeve net of the seine net, etc., in order to alert fish to the presence of the net. (For example, Publication of Utility Model Publication No. 38-21269) [Problems to be solved by the invention] However, in this type of seine fishing gear described above, the luminescent layer falls off due to bending of the net material or surface friction. However, there was a disadvantage that the luminescent ability disappeared in a short period of time, and it could not be put to practical use.
In addition, since this type of fishing gear has a luminescent layer attached to the netting thread, the netting thread is thicker and has greater resistance to running water than regular seine fishing gear, resulting in lower fuel costs. It was also economically disadvantageous due to the increased cost. The purpose of this invention is to provide a seine fishing gear that eliminates the effects of bending of the net fabric and surface friction, maintains the luminescent effect semi-permanently, and has high fishing efficiency without increasing running water resistance. be. [Means for Solving the Problems] The structure of the present invention that solves the problems of the prior art is that, in a seine net that has luminescence, it is possible to apply light to the necessary parts of the seine net excluding the fishing part (cottoned) of the seine net. , is characterized by a material made by mixing synthetic resin with a phosphorescent substance at a weight ratio of 0.1 to 30% and spinning it into yarn, which is bound in a movable manner. [Example] Details of the example will be described with reference to the drawings. A is a seine net body, and the seine net body A is composed of a sleeve net 1, a body net 2, a ceiling net 3, a dowel 4, etc. The present invention is based on the seine net body A.
Floating members 5, which are movable by water flow, are attached to required locations of the sleeve net 1, body net 2, and ceiling net 3, excluding the dowels 4 constituting the net. The floating member 5 is made of a material made of a synthetic resin (such as polyethylene) mixed with a phosphorescent material at a weight ratio of 0.1 to 30%, specifically, synthetic fiber itself, a film-like body, a molded net, or a molded rope. As shown in the figure, these synthetic fibers, film-like bodies, molded nets, molded ropes, etc. are folded in half and the bent portions are attached to the desired locations on the net fabric using thread, etc. Alternatively, one end of the synthetic fiber itself, a film-like body, a molded net, a molded rope, etc. can be tied directly to the net so that it can move freely. The forms of luminescence include bioluminescence, chemiluminescence, and phosphors such as organic and inorganic phosphors. While organic phosphors have a short luminescence time, inorganic phosphors have a long luminescence time and appear as an afterglow, and are called phosphorescent phosphors. There is a limit to the luminous lifetime of this phosphorescent material, and as a special product that has improved on this point, there is a self-luminous material that is an inorganic phosphor mixed with a trace amount of radioactive isotope. Of these, bioluminescence requires storage at low temperatures and is difficult to handle, while chemiluminescence has difficulties in reuse. Furthermore, both bioluminescence and chemiluminescence are extremely difficult to incorporate into synthetic resins. Organic light-emitting materials release the stored light energy for too short a time and cannot be put to practical use. Self-luminous materials, which are inorganic phosphors mixed with radioactive isotopes, can damage the phosphor due to radiation or cause radiation to the human body. Due to the problem of obstacles, the present invention cannot be put to practical use. Prior art practice Publication No. 38-21269
In what is shown in the publication, these things are referred to as luminous bodies,
In addition, although the luminescent substance is not specifically specified as a self-luminous substance, in view of the above-mentioned issues, in this invention, it is possible to mix it into synthetic resin etc., it is possible to reuse it, and it is possible to emit light. We chose a phosphorescent material as the light emitter because it is the simplest and easiest way to use light energy as external energy for this purpose. Next, the reason why it was specified in the present invention to mix the phosphorescent fluorescent substance with the synthetic resin at a weight ratio of 0.1 to 30% will be explained. Table 1 shows the yarn strength when spun a phosphorescent fluorescent substance in polyethylene resin at different mixing ratios, and the yarn strength at 10 mm from the yarn surface.
It shows the change in brightness over time due to light emission at a distant location. The vision of fish varies depending on the species, but it is a very sensitive species, and it is possible to see objects up to a brightness of 10 ^-5 Lux, and the fishing time for seine nets is generally about 2 hours and 30 minutes. 10 ^-5 Lux during this time
In order to maintain the above brightness, as is clear from Table 1, the mixing ratio must be 0.1% or more. In addition, in order to make spinning possible, a mixing ratio of 30% is the limit; if the mixing ratio is higher than this, yarn breakage occurs frequently or spinning becomes impossible. For the above reasons, the present invention specifies the weight ratio of the luminescent phosphor mixed in the synthetic resin to be in the range of 0.1 to 30%.

【table】

[Table] However, the data uses zinc sulfide as the luminescent fluorescent material.
In addition, fluorescent materials include alkaline earth sulfides, zinc, silicates and phosphates such as calcium, and other base materials such as borates and germanates such as silver, copper, gold, zinc, blue lead, etc. Some contain heavy metals such as manganese, chromium, or transition elements such as rare earths added as inert agents. Representative names of substances include zinc sulfide, zinc silicate, calcium sulfide, and cadmium sulfide. [Effects of the Invention] As described above, according to the configuration of the present invention, the following effects can be obtained. (a) During daytime operations in the deep sea where little sunlight penetrates, or during nighttime operations, for example, a school of fish caught between the left and right side nets may be visually recognized by the presence of luminescent floating members attached to the side nets. By doing so, it is possible to prevent fish from coming close to the net, preventing them from slipping through the nets, and once fish are caught between the two nets, they are ensured to enter the net without escaping, improving fishing efficiency. In addition, since the floating member moves freely with the flowing water, it has a threatening effect on the fish, further preventing the fish from escaping from the mesh, and improving the fishing efficiency. (b) synthetic fibers mixed with luminescent fluorescent substances, or
By increasing the mesh size of the net section to which the floating member made of a film-like material is attached, it becomes easier for fish to recognize the net section, and therefore a attracting effect can be obtained. That is, since the mesh can be formed larger than a normal mesh, there is less resistance to running water, and there is a large economic effect such as energy saving. (c) The mixing ratio of the phosphorescent fluorescent substance mixed into the synthetic resin material that makes up the net line was set in the range of 0.1 to 30%, so that the fish could be seen visually for about 2 hours and 30 minutes, which is the seine time of the seine. In addition to being able to maintain a brightness of 10 ^-5 Lux or higher, it also provides a seine net that is free from the risk of line breakage, improving fishing efficiency. (d) The catch data using the net of this invention as a bottom trawl net is as shown in the table below.

【table】

However, the data is based on 5 days of operation using a net made of synthetic fibers spun by mixing zinc sulfide with polyethylene at a weight ratio of 6% as the luminescent fluorescent material.

[Brief explanation of the drawing]

The figure is a perspective view of a seine main body with a floating member attached. A...Floating member, 1... Sleeve net, 2... Body net, 3
...Ceiling net, 4...Topped, 5...Floating parts.

Claims (1)

[Scope of utility model registration request] In a seine net that has luminescence, a material made by mixing synthetic resin with a phosphorescent substance at a weight ratio of 0.1 to 30% and spinning it is suspended in the required parts of the net fabric, excluding the fishing part (cottoned) of the seine net. A dragnet characterized by being able to bind.