JPH0142454Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a novel seaweed net knitted with bulky yarns of different diameters.

Seaweed nets are used to cultivate healthy seedlings of seaweed spores and to harvest high-quality seaweed spores, and in terms of cultivation management, seaweed nets are required to have water retention properties to prevent drying out. In order to ensure that all of the seaweed spores that have set seedlings can receive sufficient sunlight, and that the nutrient salts in the seawater are evenly absorbed, the net must be spread evenly and there must be no misalignment of the mesh. It is essential. For this reason, the seaweed nets currently in use are made of polyvinyl alcohol-based synthetic fibers that are strong and highly water-absorbing.In order to prevent the mesh from shifting after knitting, a fine-grained spun system is used, and many of these are used. It is made of real twisted material and knitted with knots or without knots so that the diameter of the mesh threads is approximately 2 to 4 mmφ.

However, the current seaweed net is expensive because it requires the use of polyvinyl alcohol-based synthetic fibers in order to impart water absorption and so-called water retention properties, and it also uses a fine-grained span system to prevent mesh misalignment, so-called knot misalignment. On the other hand, the net thread diameter is 2 to 4 mmφ
Since it is twisted to a certain thickness, it requires a very large amount of yarn and the cost of the fabric is very high, and because it uses a fine-grained spun system, its durability in use, especially its abrasion resistance, is extremely poor. During use, seaweed spores that have settled on the fluffy areas that occur due to wear and tear,
As the seaweed grows, it becomes subject to strong resistance from waves and tidal currents, and the fluffy parts are easily cut off and peeled off, causing the hard-grown seaweed to be washed away, which impedes productivity, and even makes it difficult to set seedlings. As a result, the contamination with silica algae and shellfish other than seaweed is also significant.As a result, when cultivating seaweed in the following year, the contamination of these silica algae and shellfish will reduce seedling performance, so new netting is required. In addition to the high cost of the net fabric, such as the need to apply glue to the fabric, there are inherent problems such as additional maintenance costs.

The present invention was developed in view of the current problems with seaweed netting, and the present invention is a composite film having a coating layer made by applying a synthetic resin adhesive and drying it on one side of a biaxially stretched synthetic resin film. The film is cut into the required size, heated and stretched at the required stretching rate, and the film layer is formed by utilizing the difference in heat shrinkage rate in the width direction due to stretching between the biaxially stretched synthetic resin film and the film layer. A net is made by using a single yarn or an arbitrary number of bulky yarns of different diameters, in which a hollow part is formed by winding and condensing both edges of the synthetic resin film on the outside surface and the synthetic resin film on the inside surface toward the center. By knitting the base, it is possible to maintain physical water retention in the hollow part at an extremely low cost, and due to the cross-sectional shape of different diameters and the tightness of the hollow part, there is no knotting or so-called mesh shift, and the coating layer is The object of the present invention is to provide a seaweed net that can significantly improve the ability to set seedlings by adhering glass powder, silica sand powder, iron powder, etc. to the outer surface.

Below, the embodiments of the present invention will be explained in detail based on the drawings.
Figure 1 is a perspective view of the composite film, Figure 2 is an enlarged sectional view of the same, Figures 3 and 4 are cross-sectional views of bulky yarns of different diameters, and Figure 5 is the present invention knitted with knots using single yarns. The biaxially stretched synthetic resin film 1A is not particularly limited as long as it is a strong and durable material, and is usually polyester, polyamide, polyolefin, or polyvinylidene chloride. etc., is extruded into a thin film using an extrusion molding machine such as a T-type die or an inflation molding machine, and the thin film is stretched approximately 5 to 20 times in the biaxial direction, resulting in a thickness of approximately 5 to 20 times. It is formed into a material of about 30μ. Then, on one side of this biaxially stretched synthetic resin film 1A, the synthetic resin film 1A
A coating layer 1B is formed by applying and drying a suitable synthetic resin adhesive that can be bonded to the substrate. It is advantageous for this coating layer 1B to be formed thinner than the biaxially stretched synthetic resin film 1A, both from the viewpoint of winding and condensation and from the viewpoint of maintaining the flexibility of the yarn produced. However, if it is extremely thin, for example, less than 5% of the thickness of the synthetic resin film 1A stretched biaxially, the winding and condensation during stretching will be slow and it will be difficult to form a hollow part, resulting in insufficient water retention. The result was unexpected.

When the component of the synthetic resin adhesive forming this coating layer 1B is a highly water-absorbing synthetic resin such as polyvinyl acetate, polyvinyl alcohol, or polyamide, the number of seaweed spores is relatively low. Seedling properties are also good, but when hydrophobic synthetic resins such as polyvinyl chloride and polyester are used, glass powder, silica sand powder, and iron powder are used to ensure that seaweed spores can set seedlings in large quantities and firmly. Alternatively, it is preferable that a seedling-setting promoting powder 1C made of these compounds in powder form is adhered to the outer surface of the coating layer 1B using the coating layer 1B as an adhesive medium.

The composite film 1 formed in this way is
It is cut to an appropriate width in advance and stretched to match the desired fineness, but the stretching ratio in this case is determined by the remaining stretching of the biaxially stretched synthetic resin film 1A constituting the composite film 1. It is determined appropriately depending on the degree, but usually approximately 1.5 to 4.0
It is expanded to about twice the size. It is important that the stretching is carried out by heating, and the heating temperature is substantially higher than the secondary transition point of the biaxially stretched synthetic resin film 1A, and the heating temperature is substantially higher than the secondary transition point of the biaxially stretched synthetic resin film 1A.
This is done at a temperature that allows A to thermally shrink in its width direction. By stretching, the composite film 1 cut into the required width is stretched in the longitudinal direction at a predetermined stretching ratio. However, since the composite film 1 is flat, the stretching ratio The width of the biaxially stretched synthetic resin film 1A constituting the composite film 1 is expanded while being condensed toward the center in inverse proportion to the width of the film. On the other hand, since the other coating layer 1B is substantially non-oriented and so-called non-stretched, it exhibits almost no thermal shrinkage behavior, and therefore, the composite film 1 is made of a biaxially stretched synthetic resin film on one side. A difference in heat shrinkage and condensation occurs between the coating layer 1A and the coating layer 1B on the other side, and as a result, the composite film 1 has the coating layer 1B, which has less heat shrinkage and condensation, as the outer surface, and the both edges thereof are inward toward the center. Bulky yarns 2 of different diameters having different diameters in cross-section are formed by winding and collecting, respectively forming hollow portions 2A and 2A'. In this case, the biaxially stretched synthetic resin film 1 of the composite film 1
When the stretching ratio is significantly lower than the residual elongation maintained by A, or when stretching is carried out at too low a stretching temperature, the winding condensation as shown in FIG. 4 becomes slow and the hollow portions 2A, 2A' It should be noted that the fibers may also be formed to be soft, resulting in loss of water retention, nodularity, or elasticity, which may impede the ability to spread.

The seaweed net 3 of the present invention is completed by knitting the thus created bulky yarns 2 of different diameters into a knotted or knotless form using a single yarn or a required number of yarns.

The present invention has the above-mentioned structure, and includes a composite film having a coating layer formed by applying and drying a synthetic resin adhesive on one side of a biaxially stretched synthetic resin film. Because we use bulky yarn of different diameters, which are cut to a width of 100 mm, heated and stretched at the required stretching ratio, and then rolled and condensed on both sides to form a hollow part, it has excellent flexibility and bulk. Since it is possible to knit even a material with a relatively large fineness with a single yarn, not only can the twisting process during knitting of the net fabric be reduced, but also it is possible to knit a material with a relatively large fineness simply by changing the cutting width of the composite film. Not only is the cost extremely low, as seawater that has entered the hollow part is difficult to leak out, but it also exhibits a sufficient water retention effect even when drying out. The hollow part is compressed and knotted in a concave deformed state, and the knotting properties are extremely improved, preventing the mesh from deforming during use and significantly improving the extensibility. Harvesting performance can also be significantly improved by adhering seedling-setting promoting powder to the outer surface of the bulky yarn of different diameters. Moreover, since the bulky yarn of different diameters is made by winding and condensing a single film-like material, it has extremely high abrasion resistance, and the seaweed net has many characteristics such as completely eliminating the problem of net breakage during use. It can be said.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the composite film, Figure 2 is an enlarged sectional view of the same, Figures 3 and 4 are cross-sectional views of bulky yarns of different diameters, and Figure 55 is a composite film of the present invention knitted with knots using single yarns. It is a partial explanatory diagram. DESCRIPTION OF SYMBOLS 1... Composite film, 1A... Biaxially stretched synthetic resin film, 1B... Coating layer, 1C... Seedling promotion powder, 2... Different diameter bulky yarn, 2A, 2A'... Hollow part, 3... ...Seaweed net.

Claims (1)

[Claims for Utility Model Registration] A composite film having a coating layer formed by applying and drying a synthetic resin adhesive on one side of a biaxially stretched synthetic resin film is cut to the required width and then cut to the required width. Knitted using bulky yarns of different diameters, which were heated and stretched at a stretching rate of , and then the opposite edges of the cut composite film were wound and condensed toward the center to form a hollow part. A seaweed net featuring Utility model registration claim 1, in which a seedling-promoting powder made of powdered glass powder, silica sand powder, iron powder, or a compound thereof is adhered to the outer surface of a coating layer using the coating layer as an adhesive medium. The seaweed net described.