JP3592787B2 - Reinforced plastic net - Google Patents

Description

[0001]
[Industrial applications]
TECHNICAL FIELD The present invention relates to a plastic net used as a surrounding facility such as a house or a park square, or as an embankment reinforcing material or a soil retaining material.
[0002]
[Prior art]
The nets used in the enclosures are nets made of diamond-coated metal wire coated with plating, plastic, or baked paint, expanded metal with steel strips open and plated and painted, and steel Grid-type fences and the like described in Japanese Patent Application Laid-Open No. 55-26362, which mainly use pipes, are generally known. In addition, plastic is integrally formed as a net used for embankment reinforcing materials, cigarette materials, and the like. Known product names such as "Tikal Net", a squared product name, "Netron Net", a rhombic product surface, woven fabrics, non-woven fabrics, and knitted nets of plastic fibers are also known. A technique for manufacturing a hologram has been conventionally known.
[0003]
[Problems to be solved by the invention]
However, structures (net structures) using nets mainly composed of the above-mentioned wires or steels are easily rusted, and require rust-proofing processes such as plating, coating, and baking in addition to the knitting process and the grid assembly process. In addition, since the main material is steel, it is heavy, and there are many problems in transportation or construction.
[0004]
In addition, nets such as the above-mentioned "trical net" and "netron net" are manufactured only by a plastic extrusion process and are lightweight and easy to handle, but they are used for civil engineering such as enclosure facilities, embankment reinforcing materials, and cigarette materials. However, there is still a problem in terms of strength when it is used for plastics, and although high-strength plastic fibers have been developed in recent years even for nets made of plastic fibers, weaving other than the spinning process in terms of production. Since a process, a knitting process, and the like are required, many problems in terms of production efficiency remain.
[0005]
Therefore, the present invention provides a plastic net, which is a reinforced plastic that requires the strength necessary to be used for civil engineering applications, while reinforcing the plastic net for use in the same application as a net mainly made of metal wire or steel. The purpose is to provide a net.
[0006]
[Means for Solving the Problems]
The reinforced plastic net according to the first aspect of the present invention has a number of linear weft portions made of plastic and a number of linear weft portions formed integrally with these weft portions and intersecting with those weft portions. A plastic net in which a large number of openings are formed by warp portions, wherein a reinforcing core material having a flat cross section is planarly included in at least one of the weft portions. .
[0007]
In this configuration, as in the invention according to claim 2, it is possible to form the reinforcing core material with a band made of iron or a band made of stretched resin.
[0008]
[Action]
In the reinforced plastic net according to claims 1 and 2, the transverse tension of the net is increased by the weft portion including the reinforcing core. Also, even if a rust-prone metal (for example, an iron band) is used as the reinforcing core, the progress of rust is greatly delayed due to the rust-preventing action of the weft thread made of plastic surrounding the reinforcing core. Become. Further, since the tensile strength of the weft portion enclosing the reinforcing core material is increased, the weft portion can be securely fastened to a post, a pile, or the like. The end of the portion eliminates the need for extra reinforcement at the end of the net. And when the belt-like body is used in the reinforcing core material in a plane with the net surface as in the invention according to the second aspect, a fastening tool such as a tapping screw is made to penetrate the reinforcing core material and the weft portions thereof are connected to each other. Also, the weft portion is easily fixed to a post, a pile, or the like. Here, the term “planar” means a form in which the longitudinal direction of the reinforcing core material has a flat cross section and the longitudinal direction thereof coincides with the longitudinal direction of the net.
[0009]
Further, the reinforced plastic net according to the first and second aspects of the present invention is made of plastic as a main material, so that a well-balanced coloring according to the situation of the place of use becomes possible.
[0010]
【Example】
FIG. 1 is an enlarged front view of a part of a reinforced plastic net A according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II of FIG. The plastic net A includes a number of linear weft portions 1 made of plastic, and a number of linear warp portions 2 made of plastic that are formed integrally with the weft portions 1 and cross the weft portions 1. And a plastic net in which a large number of openings are formed, and at least one of the multiple weft yarn portions 1 has a reinforcing core material 3 included therein. For the reinforced plastic net of the present invention, a thermoplastic resin such as polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), ethylene vinyl alcohol (EVA), and polycarbonate (PC) is preferably used.
[0011]
The reinforcing core material 3 is a belt-shaped body having a flat cross section, and iron or a stretched resin is preferably used. When a belt-shaped body made of a stretched resin is used for the reinforcing core member 3, the reinforcing elastic member 3 has a tensile modulus greater than 5 GPa by stretching. In the case of using a band, consideration should be given to minimizing the deterioration of the physical properties of the stretched PP band due to the influence of heat, such as by using EVA or the like having a lower melting temperature. It can be suitably used for civil engineering such as wood and shigara.
[0012]
Note that the weft 1 and the warp 2 may form a right-angle lattice as shown in FIG. 1, or may form a parallelogram or a substantially rhombic lattice. That is, the intersection angle between the weft 1 and the warp 2 is not limited to a right angle. However, it is desirable that the weft portions 1 extend in parallel between them.
[0013]
FIG. 3 is a schematic front view showing a surrounding facility B constructed using the long reinforcing plastic net A, and FIG. 4 is an enlarged sectional view showing a part of the surrounding facility B in FIG. Reference numeral 4 denotes a post erected on the foundation 5, and the net A is stretched between a plurality of posts 4 at a predetermined interval. In the net A, the reinforcing core material 3 is included in the three weft portions 1 (the weft portion 1 at the top edge in the vertical direction) at the uppermost portion, the lowermost portion, and the central portion. Then, an appropriate portion of the weft thread portion 1 in which the reinforcing core material 3 is included is fixed to the post 4 by using a fastener 6. The post 4, the foundation 5, the fastening device 6, etc., can be the ones that are already common, and the surrounding facility B using these has been installed in a number of well-known construction methods. Can be fully utilized depending on. For example, when a post made of wood or plastic waste is used as the post 4, a general nail or a screw nail can be used for the fastener 6. When a post made of a hard material such as steel or concrete is used as the post 4, a self-tapping screw can be used for the fastener 6, and by doing so, the net A can be formed very easily. A sticking operation can be performed. At the place where the weft thread portion 1 containing the reinforcing core material 3 and the post 4 are fixed, as shown in FIG. 4, the weft thread portion 1 containing the reinforcing core material 3 is attached to the post 4 with a fastening tool 6 made of a self-tapping screw. Driving (screw in). When a fastener such as a general nail or a screw nail, which is difficult to drive into the metal reinforcing core 3, is used as the fastener 6, a hole for inserting the fastener 6 into the reinforcing core 3 in advance. It is good to establish. When the metal reinforcing core 3 is thin or the like, a general nail, screw nail, or the like can be driven as it is. Further, if a "simple post for fence" proposed by the present applicant in Japanese Patent Application No. 7-35934 is used as a post, it is possible to easily adjust the slack in the installation work of the reinforced plastic net of the present invention. The operation is very efficient and simple.
[0014]
In the net A stretched over the post 4 in this manner, the lateral tension of the entire net A is increased by the reinforcing core material 3 included in the weft thread portion 1, so that the net A hangs down or sags. Etc. are unlikely to occur. Further, since the fastening member 6 penetrates the reinforcing core member 3, the weft thread portion 1 including the reinforcing core member 3 is not only firmly fixed to the post 4, but also the post 4 is fixed by the fastening member 6. There is no occurrence of a situation in which a crack or a defect is generated at the fastening portion of the weft thread portion 1 fastened to the weft thread portion 1 and the weft thread portion 1 is detached from the fastening device 6. Since the reinforcing core 3 is made harder to rust by the rust-preventing action of the weft thread portion 1 made of plastic, the situation where the reinforcing core 3 becomes brittle due to rust and breaks does not occur. Furthermore, since the reinforcing core material 3 is included in the weft thread portion 1, it cannot be seen from the outside, and since the weft thread portion 1 is made of plastic, it is easy to improve the appearance by coloring it. It is possible.
[0015]
In the enclosing facility B as described above, if the weft portion 1 in which the reinforcing core material 3 is included is at least one at the upper end thereof, a sufficient effect is exhibited in the installation work.
[0016]
FIG. 5 schematically shows an example in which the net A is used as the tobacco material C. Reference numeral 7 denotes a pile driven into place on the slope H, and the net A is stretched horizontally using the pile 7. The fixing of the pile 7 and the net A can be performed according to the description of FIG. Although not shown, when the net A is used as the embankment reinforcing material, it is desirable to include a reinforcing core material in all of the weft portions in consideration of its strength, but such a net A is integrated vertically and horizontally. In making the nets A, the reinforcing portions at the ends of the nets A can be connected to each other by the above-mentioned screwing, and so on. It becomes possible to integrate.
[0017]
FIG. 6 schematically shows a molding apparatus capable of continuously extruding the above-mentioned net A. The method of forming these right-angled nets has already been disclosed by the applicant in Japanese Patent Publication No. 3-64292. Is disclosed. In the drawing, reference numeral 11 denotes a fixed die having a function of extruding a molten resin into a cylindrical shape from a passage 12. Reference numeral 13 denotes a fixed die 11 which vibrates up and down with a stroke S to open and close an outlet 12 a of the passage 12. Groove 14 is provided at a plurality of locations below the peripheral surface of the vibration die 13. Of the plurality of grooves 14 of the vibrating die 13, a predetermined groove 14 a extends upward and corresponds to a cylindrical body 15 such as a nipple provided through the passage 12.
[0018]
When molding the net A using such a molding device, the molten resin is fed through the passage 12 and the vibrating die 13 is vibrated up and down at a predetermined timing while extruding the molten resin from the outlet 12a. At the same time, the reinforcing core material 3 is fed into the predetermined groove 14a of the vibration die 13 through the cylindrical body 15. In this manner, when the vibrating die 13 is lowered to close the outlet 12a of the passage 12, the molten resin is extruded only from the grooves 14, 14a, and the molten resin extruded from the predetermined groove 14a at that time is reinforced. The core material 3 is covered and included. This step is a step in which the weft portion 1 is formed. When the vibrating die 13 rises and opens the outlet 12a of the passage 12, the molten resin is extruded from the outlet 12a while being kept in a ring shape. This step is a step in which the warp portion 2 is formed. Accordingly, by vibrating the vibrating die 13 up and down at a predetermined timing, the warp yarn portions 2 are formed one after another at intervals corresponding to the timing.
[0019]
The net A composed of the assembly of the weft section 1 and the assembly of the warp section 2 formed by being extruded from the outlet 12a of the passage 12 is then cooled and hardened into a tubular net A 'as shown in FIG. A flat net A is obtained by cutting and developing the warp yarn portion 2 between two adjacent weft yarn portions 1 and 1 in the tubular net A 'as shown by broken lines. The cross-sectional shape of the weft thread portion 1 of the net A matches the groove shape of the groove portions 14 and 14a of the vibrating die 13 described in FIG. 6, and by appropriately selecting the shape of the groove portions 14 and 14a, it is shown in FIG. It is possible to manufacture the net A having the weft portion 1 having a cross-sectional shape.
[0020]
Although FIG. 6 illustrates the production of the net A having a right-angle lattice, FIG. 9 shows a molding machine capable of producing the net A having a parallelogram lattice in principle. In FIG. 9, reference numeral 21 denotes a cylindrical rotary die having a groove 22 serving as a resin passage formed on an inner surface thereof. Reference numeral 23 denotes a fixed die provided on the inner peripheral surface of the rotary die 21 so as to be able to slide hermetically with respect to the rotary die 21, and grooves 24 serving as resin passages are provided at a plurality of positions on the outer peripheral surface. On the contrary, in this molding machine, there is no problem in principle even if a cylindrical die is fixed, and a rotary die is provided on its inner surface so as to be able to slide hermetically. In such a molding machine, using one extruder or two extruders for separating warp and weft, the rotary die 21 is pushed as indicated by the arrow R while extruding the molten resin from each outlet of the resin passages 22 and 24. When rotated at a predetermined speed, the weft portion is formed by the molten resin extruded from the plurality of grooves 24 on the fixed die 23 side, and the molten resin extruded from the groove 22 on the rotary die 21 is spirally wound around the weft portion. To form a warp portion. Therefore, if the reinforcing core material 3 is fed into at least one of the plurality of grooves 24 on the fixed die 23 side, a parallelogram lattice net in which the reinforcing core material is included in at least one of the weft yarn portions is formed. .
[0021]
【The invention's effect】
In the reinforced plastic net of the present invention, since at least one weft portion includes a reinforcing core material having a flat cross section in a plane, the weight of the reinforced plastic net is much heavier than a plastic-only net described as a conventional example. High tensile strength can be provided without breaking. Therefore, when used for enclosure facilities, embankment reinforcing materials, cigarette materials, etc., fixing of posts or connecting and fixing nets is simplified, and the fixing strength is increased, and the fixing strength to posts is equivalent to that of steel nets And at the same time, there is an effect that sagging and loosening are less likely to occur. Further, as compared with the net mainly made of steel described as the conventional example, there is an advantage that the manufacturing is simple, the weight is light, and the handling in transportation and construction is easy. And since it can be easily colored as in the case of the plastic-only net described as a conventional example, it can be used for a wide range of applications, such as improving the appearance when used for enclosure facilities and cigarette materials. Is the biggest advantage.
[Brief description of the drawings]
FIG. 1 is an enlarged front view of a part of a net according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
FIG. 3 is a schematic front view showing an enclosure facility constructed using a long net.
FIG. 4 is an enlarged sectional view showing a part of the enclosing member of FIG. 3;
FIG. 5 is an explanatory diagram of a case where a net is used as a shigar material.
FIG. 6 is a schematic cross-sectional view for explaining a forming apparatus capable of continuously extruding a net and a forming process thereof.
FIG. 7 is a schematic perspective view of a cylindrical net formed by the forming apparatus of FIG. 6;
FIG. 8 is an enlarged perspective view of a main part of the net.
FIG. 9 is an explanatory view showing in principle another forming apparatus capable of continuously extruding a net.
[Explanation of symbols]
A Net 1 Weft 2 Warp 3 Reinforcement core

Claims (1)

A plastic made of plastic having many linear weft portions made of plastic and many linear warp portions made of plastic that are formed integrally with these weft portions and intersect with those weft portions to form many openings. A net, wherein a reinforcing core material having a flat cross section, which is a band formed of iron or a band formed of stretched resin, is planarly included in at least one of the plurality of wefts. And reinforced plastic net.

Images