JPH0253578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a three-dimensional reticular molded article, that is, a molded article made of synthetic resin that is reticular in all three dimensions, and a method for producing the same.

The reticular molded product according to the present invention is not particularly limited in its uses, but specifically, it can be used for various purposes such as grating, paving materials for passages, etc., or cushioning materials, decorative members, etc. It is something.

BACKGROUND ART All conventionally known net-like or slatted molded bodies are merely two-dimensional net-like molded bodies having a large number of through holes in the vertical direction. For example, Publication of Utility Model Publication No. 53-6266, Publication of Utility Model Publication No. 53-6267
As seen in the above publications, it is known that the lower surface of the lattice-shaped panel body has protruding legs, but there are three-dimensional mesh-shaped panels that also have a lattice-like or net-like part on the lower surface. Due to the seemingly great difficulty in molding such molded products, no such molded products have actually been offered to the world as practical products.

Technical Problems to be Solved by the Invention In view of the background of the above-mentioned prior art, an object of the present invention is to provide an embodiment in which two-dimensional net-like portions are vertically spaced apart and a net-like structure is also formed between these portions. A molded article with excellent strength, air permeability, design, etc., which has a three-dimensional net shape connected by
The purpose of this invention is to provide a structure suitable for mass production that can be easily produced by injection molding, etc., and a manufacturing method thereof.

Means for Solving the Problems For the above-mentioned purpose, one aspect of the present invention relates to the configuration of a three-dimensional mesh molded body, and includes a pair of upper and lower mesh bodies located in parallel with a predetermined interval, and a pair of upper and lower mesh bodies located in parallel with a predetermined interval apart. and a large number of pillar portions connecting mesh intersecting points, and both of the meshes are arranged alternately in a relational arrangement in which large polygonal meshes and relatively smaller polygonal meshes are adjacent to each other. They are arranged in such a manner that, in the relationship between the upper surface side mesh body and the lower surface side mesh body, the large meshes of one mesh body and the small meshes of the other mesh body are located opposite to each other. Another invention relates to the method for manufacturing the three-dimensional reticular molded body, in which a plurality of protruding core portions each having a substantially polygonal cross-section formed on an inclined surface whose circumferential side surface forms a predetermined draft angle are alternately arranged. A molding die having first and second templates is used, and the two templates are such that when the mold is closed, the planar opposing circumferential sides of the core portion are in close contact with each other, and each core portion is in close contact with each other. A cavity for forming the net body is formed between the top peripheral edge of the core part and the mating mold plate, and a cavity for forming the pillar part, which is continuous with the cavity for forming the net body, is formed between the corners of the adjacent core parts. The present invention is characterized in that, in a closed mold state in which the first and second mold plates are combined, molten resin is injected into the cavity and cured, and then the mold is opened to take out the molded product.

Embodiments Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

FIG. 1 shows the entire three-dimensional reticular molded article A according to the present invention, and FIG. 2 shows a part thereof in an enlarged manner.

As seen in these figures, the molded body A consists of a pair of upper and lower planar mesh bodies 1 and 2 located parallel to each other with a household interval, mesh intersecting points 6 of these mesh bodies 1 and 2, It consists of a large number of pillar parts 3 with 7 spaces connected to each other. This molded body A is entirely made of synthetic resin.

As can be seen from FIGS. 2 and 3, both of the mesh bodies 1 and 2 have a large square mesh 4 whose four corners are slightly cut out, and a similarly square mesh 5 which is relatively smaller than the large mesh 4. are alternately arranged vertically and horizontally so that they are adjacent to each other on all sides. Then, a mesh section 1 is formed between the large mesh 4 and the small mesh 5.
Both a and 2a are as shown in Figure 4,
It has an approximately right triangular cross section. In addition, this triangle has horizontal surfaces on both upper and lower sides of the molded body A, a substantially vertical surface on the inner circumferential surface of the larger mesh 4, and a substantially vertical surface on the inner circumferential surface of the smaller mesh 5 of the other mesh 1 or 2. It is designed as a slope facing diagonally to the ground.

In addition, the net body 1 on the upper side and the net body 2 on the lower side are as shown in FIGS. 2 and 3 in their mutual relationship.
As can be easily understood from the figure, the smaller meshes 5 of the other mesh body are positioned opposite the larger meshes 4 of one of the mesh bodies.

Furthermore, a pillar portion 3 connecting both mesh bodies 1 and 2
has a substantially rectangular cross section, but as shown in FIGS. 2 and 5, it extends from the large mesh 4 of one mesh 1 or 2 to the small mesh 5 of the opposing mesh 2 or 1. Both side surfaces are formed into slopes 3a that are inclined in a direction that gradually separates from each other. That is,
When viewed from the direction of the large mesh 4, the space surrounded by the pillar portions 3 at the four corners has a tapered shape.

Next, a method for manufacturing the reticulated molded body A will be described.

FIG. 7 to FIG. 10 show a mold for the molding, and each of the molds has a large number of protruding core portions 10a each having a substantially rectangular cross section on opposing surfaces,
A first mold plate 10 and a second mold plate 11 are provided as essential members, and the first mold plate 10 and the second mold plate 11 have the mold plates 11a arranged alternately so as to interlock with each other. The core portions 10a and 11a of both templates 10 and 11 have peripheral surfaces formed into substantially tapered slopes in order to form a predetermined draft angle, and the core portions 10a and 11a of both templates 10 and 11 are formed with substantially tapered slopes, and the core portions 10a and 11a of the templates 10 and 11 are formed with substantially tapered slopes, and the core portions 10a and 11a of the templates 10 and 11 are formed into substantially tapered slopes. During molding, the planar opposing circumferential surfaces are brought into close contact with each other. This close part is
This is to form an opening between adjacent pillar parts 3, 3 in the molded body A.

In addition, each of the core portions 10a and 11a has its top peripheral edge cut off diagonally to form a chamfered slope 12, so that when the mold is closed, it does not interact with the mating mold plate as shown in FIG. A mesh molding cavity 13 having a substantially triangular cross section is formed between the two. Of course, the cavity 1
3 in the form of a net, the core part 1
The top surface of 0a, 11a is the other party template 10 or 11
It is designed to be placed in close contact with the bottom of the

Furthermore, each of the core portions 10a, 11a has four corner portions in its cross section cut out diagonally, and chamfered slope portions 14 (see FIG. 10) are also formed in these portions. Therefore, due to the sloped portion 14, when the mold is closed, the mesh molding cavity 13 is formed between four adjacent core portions as shown in FIG.
A cavity 15 for molding the pillar portion is formed which is continuous with the pillar portion.

Thus, the mesh-like molded body A is provided on one of the fixed mold plates when the first and second mold plates 10 and 11 are in a closed mold state using the above-mentioned mold. This is obtained by injecting the molten synthetic resin into the cavities 13, 15 through one or more gates (not shown), cooling and hardening the resin, and then opening the mold and removing the molded product.

In addition, in the illustrated embodiment, the meshes 4 of the mesh bodies 1 and 2,
5 is basically square, but the shape of the mesh is a large mesh 4 and a small mesh 5.
The present invention can be applied to any shape that allows the shapes to be arranged adjacent to each other. Therefore, each mesh can be made into a triangular shape, for example, and even if it is a quadrilateral, it is not limited to a square.
It is also possible to make it rectangular. In the case of the above-mentioned triangular shape, it goes without saying that the core portion of the molding template should have a corresponding substantially triangular cross section.

Furthermore, the small meshes 5 of each mesh body 1, 2 do not necessarily need to be open meshes in this invention. That is, the concept of the mesh 5 also includes a case where the inner side of the surrounding mesh crosspieces 1a, 2a is closed by a membrane-like or plate-like part. In order to obtain a molded product in which such small meshes 5 are closed, the molding die has the required space between the top surfaces of the core portions 10a, 11a and the opposing surface of the other template when the mold is closed. Needless to say, it is used to form a gap between the two.

Effects of the Invention The three-dimensional net-like molded article A according to the present invention has the above-mentioned configuration, and has planar nets 1 and 2 spaced apart from each other on both the upper and lower surfaces, so it can be used, for example, as a mat block for cleaning shoes, etc. When it is laid on the ground or on a support beam as a road surface material, it not only has good laying stability, but also because both the nets 1 and 2 are connected by a large number of vertical pillars 3. It has excellent compressive strength and can be made durable and not easily buckled. Moreover, since there are simply a large number of pillar parts 3 between the upper and lower mesh bodies 1 and 2, which have a mesh-like space in the vertical and horizontal directions, it has free permeability in all three-dimensional directions. When used as a bedding material, it has excellent drainage, air permeability, and ability to exclude foreign matter from passing through, and it also has a unique appearance, making it suitable for use as decorative panels, etc. What can be done and what can be done. Moreover, since it is three-dimensionally reticulated, even when a large number of molded bodies are lined up and connected during use, the pillar portions 3 on the periphery can be used to easily and reliably connect them, making it convenient. be. Furthermore, since it can be easily molded by injection molding or the like using the above-mentioned molding mold, productivity is high and it is not possible to use complex molds such as those used for manufacturing undercut molded products. Since there is no need to use , it can be manufactured and provided at a relatively low cost. Further, in the manufacturing method according to the present invention, the three-dimensionally reticulated molded article A having the various characteristics described above can be easily manufactured using a mold having an extremely simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall perspective view of a molded body as a product, FIG. 2 is a partially enlarged perspective view thereof, FIG. 3 is a partially plan view, and FIG. 4 is a partially enlarged perspective view. and Figure 5 is Figure 3 - line and -
A cross-sectional view of the line, FIG. 6 is a cross-sectional view of the line shown in FIG.
FIG. 7 is a sectional view of a part of the mold for forming the above-mentioned compact in an open state, FIG. 8 is a perspective view of the same part in a crushed state, and FIG. 9 is a part of the mold in a closed state. The cross-sectional view, FIG. 10, is a cross-sectional view taken along the line of FIG. 9. A... Three-dimensional mesh molded body, 1, 2... Net body, 1
a, 2a... Net crosspiece part, 3... Pillar part, 3a...
slope, 4...large mesh, 5...small mesh,
6, 7...Intersecting points of mesh, 10, 11... Template plate of molding mold, 10a, 11a... Core part, 12...
... Chamfered slope, 13... Cavity for forming net body, 14... Chamfered slope, 15... Cavity for forming pillar part.

Claims (1)

[Claims] 1. A device comprising: a pair of upper and lower nets located parallel to each other with a predetermined interval; and a large number of pillar portions connecting mesh intersecting points of these nets; , large polygonal meshes and relatively smaller polygonal meshes are alternately arranged in a mutually adjacent relationship, and one mesh is arranged in a relationship between the upper surface side mesh body and the lower surface side mesh body. A three-dimensional net-like molded article characterized in that a large mesh of one body and a small mesh of the other mesh are placed opposite each other. 2 Claim 1 where the whole is made of synthetic resin
The three-dimensional reticular molded article described in . 3. Claim 1 or 2, wherein both side surfaces of the pillar portion are formed as inclined slopes in a direction that gradually separates from the large mesh of one mesh body toward the small mesh of the other mesh body. The three-dimensional reticular molded article described in . 4. The three-dimensional mesh molded article according to any one of claims 1 to 3, wherein the mesh is basically quadrangular or triangular. 5. Using a molding die having first and second templates each having a plurality of protruding core portions having a substantially polygonal cross section arranged alternately and formed on an inclined surface whose circumferential side surface forms a predetermined draft angle; , when the mold plates are closed, the planar opposing peripheral surfaces of the core portions are in close contact with each other, and a mesh molding cavity is formed between the top peripheral edge of each core portion and the mating mold plate. On the other hand, a pillar part molding cavity that is continuous with the net body molding cavity is formed between the corner parts of adjacent core parts, and in the closed mold state when the first and second templates are combined. A method for producing a three-dimensional reticular molded body, which comprises injecting a molten resin into the cavity and curing it, then opening the mold and taking out the molded product. 6. The method for manufacturing a three-dimensional mesh molded body according to claim 5, wherein the core portion has a top peripheral edge formed into a chamfered slope, and the mesh molding cavity has a triangular cross section. 7. The method for producing a three-dimensional reticular molded body according to claim 5 or 6, wherein the core portion has a rectangular or triangular cross section with chamfered corners.