JPS5917938B2 - Buoy manufacturing method - Google Patents

Description

[Detailed Description of the Invention] Recently, the so-called ``ocean farm'' project for cultivating fish has been widely promoted at home and abroad.

In implementing such plans, buoys (mainly spherical buoys), fishing reefs, etc. are used as equipment and equipment for collecting fish, but since fishing reefs are installed on the seabed, they do not depend on the ocean conditions. In many cases, they are buried in sand in a relatively short period of time and become useless, and since fishing reefs are mainly made of concrete, there are problems such as scum forming and fish not being able to approach them. Therefore, the above-mentioned buoy is often used, but since it is necessary to grow seaweed in order to collect fish, a buoy that can easily attract seaweed spores is required. 0
However, the buoys that have been commonly used in the past have only floated on the sea surface and have not taken into consideration the adhesion of seaweed spores, so most of them have a structure made of a single piece of plastic (or glass), and the surface of the buoy is Because the surface is smooth, it is difficult for seaweed spores to stick to it, and it cannot meet the requirements mentioned in 5 above.

On the other hand, conventional fishing buoys are manufactured by blow molding a single synthetic resin, or by injection molding halves and then integrating them by spin welding. The present invention is carried out under the sea (in a lake).
This buoy was created with the aim of providing a buoy to which 0 spores of seaweed (aquatic plants) can easily attach and which is easy to handle, and to easily manufacture the buoy. During the process of extruding the resin to form a parison, a fine mineral-based inorganic substance is attached to the surface of the parison in a layered manner, and after the attachment, the parison is blow-molded to attach an inorganic substance to the outer surface. The present invention relates to a method for producing a buoy characterized by obtaining a buoy with Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show the procedure for manufacturing a buoy according to the present invention.

In the figure, 1 is the head of an extruder, and around the head 1 there are divided nozzles 4 that supply 5 inorganic substances 3 to the exit side of the head 1.

The divided nozzle 4 is equipped with an ejector nozzle T for blowing out hot air inserted therein, and is movable in the direction of arrow p by a drive cylinder 5. Note that 2 is a parison, and 6 is a mold for blow molding disposed on the exit side of the head 1. When manufacturing plastic fillers, as shown in FIG. 1, plasticized synthetic resin is extruded from a head 1 using an extruder to form a parison 2 (approximately bottle-shaped) as shown.

In this case, during the process of extrusion molding the parison 2, the drive cylinder 5 moves the divided nozzle 4 toward the head 1 side, so that the outlet of the divided nozzle 4 is aligned with the extrusion outlet center line of the head 1.
The divided nozzle 4 held in this state is heated with fine mineral matter 3 (for example, sand, pebbles (gravel), crushed pieces, slag wool, etc.) while being supplied with hot air. When 8 is blown into the ejector nozzle 7, the inorganic substance 3 is blown off from the outlet of the divided nozzle 4 by the hot air blown out from the outlet of the ejector nozzle 7, and is extruded from the extrusion outlet of the head 1. Coming parison 2
It adheres to the outer peripheral surface of. As described above, during the extrusion molding process of the parison 2, when the inorganic substance 3 is continuously attached, most of the outer surface of the parison 2 formed into an almost bottle shape (the mouth and bottom of the bottle) The fine inorganic substances 3 form a layer and adhere to the area (excluding the area corresponding to the area). After the above parison 2 is formed, the parison 2 has the inorganic substance 3 attached to its surface.
Sandwich it between molds 6 and blow air into it to make it into a spherical shape (or an egg shape)
Form into. FIG. 2 shows the state of this blow molding. During this blow molding, the split nozzle 4 is moved in the opposite direction to the above, and the outlet of the nozzle 4 is moved away from the center line 2 of the extrusion outlet of the head 1. hold it in position. By blow molding as described above, a substantially uniform inorganic layer is attached to the outer surface, and a product that can be used by being submerged in the sea (lake) is completed. Although several examples of inorganic materials were shown in the embodiment described above, the material is not limited to these, and any inorganic material (mineral material) may be used as long as it is a material to which seaweed (waterweed) spores can easily adhere.

Furthermore, if the inner surface of the mold 6 used for blow molding is provided with circumferential grooves or irregularities, the roughness of the outer surface of the mold can be made more appropriate.

As mentioned above, the fi obtained by the method of the present invention has a fine inorganic layer attached to its outer surface, so when it is submerged in the sea (in a lake) and used, seaweed (aquatic weed) spores will not adhere to it. It is easy to handle, and since the friction coefficient of the outer surface of the fi is large, it is easy to handle without slipping.

Furthermore, since an inorganic substance is attached to the surface of the parison during the process of molding the parison, manufacturing is simple and easy (if an inorganic substance is attached after forming the fi, surface treatment of the fi, adhesive, etc. are required). (This makes manufacturing time-consuming and troublesome.)

[Brief explanation of the drawing]

FIGS. 1 and 2 show an embodiment of the method of the present invention, with FIG. 1 being an explanatory view showing a parison in an extruded state, and FIG. 2 being an explanatory view showing a blow molding state. 1...Head, 2...Parison, 3.
...Inorganic matter, 6...Mold.

Claims (1)

[Claims] 1. During the process of extruding plasticized synthetic resin with an extruder to form a parison, a fine mineral-based inorganic substance is attached to the surface of the parison in a layered manner, and after attachment, the parison is blow-molded, A method for manufacturing a buoy characterized by obtaining a buoy having an inorganic layer adhered to its outer surface.