JP2005110518A - Resin spacer pipe for retaining seeding material of culturing organism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin spacer pipe retaining a seeding material of a culturing organism with a slight risk to environmental pollution even when washed away to an ocean. <P>SOLUTION: This spacer pipe 1 consists essentially of a biodegradable resin and is used for maintaining each seeding material 4 of the culturing organism at a prescribed interval in a support 3 hung from a culturing raft 2. The spacer pipe preferably has at least 3 years of service life. The production of the spacer pipe is preferably according to a method for extrusion by taking the use of the biodegradable resin and wall thickness of the pipe into consideration. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a resin spacer pipe for holding a seedling material for an aquaculture creature inserted into a support (for example, a wire) suspended from an aquaculture cage at a predetermined interval.

Oysters and scallops are cultivated using a support (for example, a wire) suspended from a cultivated culm laid on the sea. Specifically, a large number of synthetic resin pipes such as vinyl chloride are passed through this wire as spacer pipes, and seedling materials for cultured oysters and scallops (for example, shells such as scallops) are fixed between these resin spacer pipes. They are attached at intervals, and one end of the wire is held on a spear of a culture rod and suspended in the sea (see Patent Document 1). Oysters and scallop juveniles adhere to this seeding material (for example, scallop shell), and oysters and scallops grow using plankton in seawater as a nutrient source. The oysters and scallops that have been grown by pulling the suspended wire are dropped and harvested. At that time, the resin spacer pipe is also collected, and some of the resin spacer pipe is washed away at sea or in the sea. However, since the conventional resin spacer pipe that has been washed away to the ocean is not decomposed even after a long period of time, there is a concern that it may cause environmental problems by polluting the coast or adhering to fishing nets.

Japanese Patent Laid-Open No. 11-32618

The subject of this invention is providing the resin spacer pipe which hold | maintains the seedling material of the aquaculture creature with little fear of environmental pollution, even if it is washed away to the ocean.

  The object of the present invention is achieved by a spacer pipe used for maintaining a seed material for aquaculture creatures at a predetermined interval on a support suspended from a culture trough by a pipe mainly composed of a biodegradable resin. be able to.

If a resin spacer pipe for holding seeded shells such as cultured oysters is used as in the present invention, the performance as a spacer pipe is maintained until the breeding period and collection work of oysters, etc., and this collection work etc. Even if it is washed away, it is biodegraded by microorganisms in the ocean, so marine pollution can be avoided.

The spacer pipe of the present invention relates to a spacer pipe mainly composed of a biodegradable resin, which is used as a holding resin for seeding materials for aquaculture creatures inserted at predetermined intervals into a support suspended from a culture rod. Is. The spacer pipe containing the biodegradable resin as a main component maintains the performance as a spacer pipe until the cultivation period and the collection work of aquaculture creatures such as oysters are completed. The resin spacer pipe is collected after the aquaculture creatures are harvested. However, even if the resin spacer pipes are washed away to the ocean when harvesting the aquaculture creatures, they are biodegraded by microorganisms in the ocean. Therefore, the problem of marine pollution can be avoided. Furthermore, the damaged pipes that are recovered are discarded, but when they are landfilled in the soil, they are biodegraded by microorganisms in the soil and exert the effect of a soil improvement material that activates the land. Even when incinerated, the combustion calorie is lower than that of fossil fuel-based resins, so there is an advantage that the combustion furnace is not damaged, and NOx and dioxins are not generated in the combustion gas, and the product is extremely environmentally friendly.

The biodegradable resin used in the present invention can maintain the performance as a spacer pipe within a certain period, but is not limited as long as it is biodegradable by the action of microorganisms in seawater after this period. For example, poly-α-oxy acids such as polyglycolic acid, polylactic acid, polymalic acid or copolymers thereof, poly-3-hydroxypropionate, poly-β-hydroxy such as poly-3-hydroxybutyrate Alkanoates or copolymers thereof, polyethylene adipate, polyethylene suberate, polytetramethylene succinate, polytetramethylene adipate, polycaprolactone, and other synthetic aliphatic polyesters, copolymers of 3-hydroxyacetic acid and 3-hydroxyvaleric acid And a copolymer of 3-hydroxyacetic acid and 4-hydroxyvaleric acid.
These biodegradable resins can be used alone or in combination, and there is no problem. Furthermore, on the premise that biodegradability and water resistance are not impaired, plasticizers, stabilizers, ultraviolet absorbers, pigments are added to these. Further, inorganic fillers such as silica, calcium carbonate, calcium hydroxide and talc, and organic fillers such as wood powder and pulp may be blended.

The performance maintenance period of the biodegradable resin spacer pipe used in the present invention is at least about 3 years considering the purpose of use, and maintains the strength to maintain the seeding material for about 5 years at the most. Is preferably set so that it can withstand. For this setting, the pipe thickness of the pipe mainly composed of the biodegradable resin to be used is selected according to the biodegradability in seawater, and the biodegradable resin and other general-purpose resins are used. The method of adjusting a mixing ratio is mentioned.
Examples of the general-purpose resin include thermoplastic resins such as polyethylene, polypropylene, and vinyl chloride.
However, the resin component constituting the spacer pipe includes at least 50% by weight or more of degradable resin. It is preferably 70% or more by weight, more preferably 90% by weight or more, and more preferably only the biodegradable resin.

  The manufacturing method of the spacer pipe of the present invention is not particularly limited, but it is preferable to form the spacer pipe by an extrusion molding method in consideration of using a biodegradable resin and controlling the wall thickness of the pipe. . In this method, a pipe having a constant cross-sectional shape can be stably and continuously formed.

Furthermore, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a spacer pipe 1 whose main component is a biodegradable resin according to the present invention. The length L of the spacer pipe is determined by the length of the support and the number of seedling materials for the aquaculture creature attached to the support.
Here, the material of the support is not particularly limited as long as it is a string suspended from a culture rod, but specifically, iron wire, chemical fiber, and natural fiber can be mentioned, preferably a wire. is there.
Furthermore, examples of the aquaculture creature include shellfish and seaweed. Examples of shellfish include oysters, scallops, and pearl shells, and examples of seaweed include seaweed, seaweed, and green seaweed. Oysters are preferable.
The seeding material is not particularly limited, and examples thereof include stone, cement, timber, bamboo, and shells. Preferably, it is a shell, specifically a scallop shell.

As a specific example, in a cultured oyster, the length of the wire is about 10 m and the number of seeded shells is about 30, so the length L is about 200 mm to 300 mm. The inner diameter D ₁ of the spacer pipe is about 10mm about determined by size and workability of Waya passing therein. The thickness t of the spacer pipe is determined in consideration of the biodegradability of the biodegradable resin used in seawater and the mechanical properties that can withstand the weight of the grown oyster, but it cannot be so large from the viewpoint of operability and cost. . Outer diameter _{D 2} of the spacer pipe is determined by the inner diameter _{D 1} and the wall thickness t.

  FIG. 2 shows how to use the biodegradable resin spacer pipe 1 of the present invention. A number of seeded shells (shells such as scallops) 4 such as cultured oysters are passed through the wire rope 3, and the height interval is kept constant by the biodegradable resin spacer pipe 1 of the present invention. The upper end of the wire rope 3 is supported by a culture rod 2 arranged on the surface of the sea, and oysters are grown by being suspended in a straight line in the sea. A stopper 5 is formed at the lower end to prevent the seeding shell 4 and the spacer pipe 1 from being detached from the wire rope 3. When harvesting the grown oysters, the wire rope 3 is lifted on the ship and the stopper 5 is removed, or the wire rope on it is cut, and the oysters grown on the seeding shell 4 are put on the ship together with the spacer pipe 1. Drop it.

  Hereinafter, the present invention will be described in more detail with specific examples. However, the present invention is not limited to the examples unless it exceeds the gist of the invention.

Example-1
As the biodegradable resin, an aliphatic polyester “polybutylene succinate” (manufactured by Showa Polymer Co., Ltd .: trade name Bionore # 1001) was used. Bionore # 1001 has a crystal melting point of 114 ° C., a density of 1.26 g / cm ³ , an MFR of 1.5 (190 ° C., a load of 2.16 kg), and a flexural modulus of 652 Mpa. Bionore # 1001 pellets were supplied to an extruder with a pipe die and cooled and solidified while passing through a vacuum water tank equipped with a sizing homer while being extruded at a resin temperature of 170 ° C., wall thickness t: 2 mm, inner diameter D ₁ : 9 mm, outer diameter D _2. : A 13 mm pipe was formed. This pipe was cut at a constant length L: 250 mm while passing through an automatic cutting device to obtain a target spacer pipe.

Example-2
As the biodegradable resin, polylactic acid (manufactured by Mitsui Chemicals, Inc .: trade name Lacia H-400) was used. Laissia H-400 has a crystal melting point of 166 ° C., a density of 1.26 g / cm ³ , an MFR of 3.0 (190 ° C., a load of 2.16 kg), and a flexural modulus of 3,280 Mpa. Laysia H-400 pellets were supplied to an extruder with a pipe die and cooled and solidified while being extruded at a resin temperature of 190 ° C. while passing through a vacuum water tank equipped with a sizing homer, wall thickness t: 1.5 mm, inner diameter D ₁ : 10 mm, outer A pipe having a diameter D _{2 of} 13 mm was formed. This pipe was cut at a constant length L: 250 mm while passing through an automatic cutting device to obtain a target spacer pipe.
Conventional resin spacer pipes are pipes (thickness t: 1.5 mm, inner diameter D ₁ : 10 mm, outer diameter D ₂ : 13 mm) formed of, for example, polypropylene (flexural modulus ₁ , _{200 to} 1,400 Mpa). . The biodegradable resin spacer pipe of the present invention as shown in Example 1 and Example 2 has sufficient mechanical properties to withstand the lifting of grown oysters and the like, and maintains the performance of the spacer pipe. After a period (approximately 3 years considering reuse), it is biodegraded by microorganisms in the ocean.

It is a perspective view of an example of the resin spacer pipe of this invention. L: pipe length, t: pipe wall thickness, D ₁ : pipe inner diameter, D ₂ : pipe outer diameter It is a schematic diagram which shows an example of the attachment state of the resin spacer pipe of this invention.

Explanation of symbols

1: Resin spacer pipe 2: Cultured salmon bar 3: Hanging wire rope 4: Seed shells such as cultured oysters 5: Stopper

Claims (6)

  Spacer pipe that is a pipe mainly composed of biodegradable resin and is used to maintain seedling materials for aquaculture creatures at predetermined intervals on a support suspended from a culture trough.   The spacer pipe according to claim 1, wherein the support is at least one product selected from a wire, a chemical fiber, and a natural fiber.   The spacer pipe according to claim 1, which can withstand use for at least three years.   The spacer pipe according to claim 1, which is formed by an extrusion method.   The spacer pipe according to claim 1, wherein the aquaculture creature is a shellfish or a seaweed. The spacer pipe according to claim 5, wherein the shell of the aquaculture creature is an oyster.

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