JPS5857317B2 - Manufacturing method of reticulated molded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a fiber-reinforced reticular molding.

Traditionally, net-like structures braided using various types of fibers have been widely used for fishing nets, safety nets, protective nets, etc. However, depending on the application, the properties such as heat resistance and abrasion resistance may be higher than those held by the fibers used. There are many cases where you want to do so.

In addition, new fields of use will be developed by improving the properties of these materials.

Reflecting the above industry demands, methods such as applying resin treatment to net-like materials or coating them with paint have been adopted in an attempt to improve the heat-melting resistance and abrasion resistance of net-like materials. However, such methods have limited the thickness of the coating film and have not been able to significantly improve performance.

That is, in actual production, it is extremely difficult to form a thick rubber or synthetic resin coating layer on a net-like structure while maintaining the mesh.

The inventors of the present invention have carried out various studies in order to complete a method for manufacturing a reticular reinforced molding material that retains the mesh of the reticular structure and completely covers the reticular structure, and as a result, they have arrived at the present invention and achieved the desired result. I have reached my goal.

That is, the present invention provides a method of forming a magnetically permeable net-like structure in a sheet-like manner by first covering the entire surface of the net-like structure with a molded covering material in a state in which the lengthwise and widthwise positions of the net-like structure are defined and expanded. The gist of the present invention is a method for manufacturing a net-like molded article, which is characterized in that the middle portion of the mesh is then punched out and removed.

According to the method of the present invention, a reticular composite of any thickness can be obtained, and a complete coating with no peeling or missing parts of the coating can be obtained.

Hereinafter, the structure of the invention, embodiments and effects will be explained in more detail.

In the present invention, the network structure can be applied to any type of fiber, including inorganic, organic, natural, and artificial fibers.

Preferably, synthetic fibers such as polyamide and polyester are used.

Metal filaments (fibers) can be used in some cases, but chemical fibers usually do not have strong adhesion to the covering material, so they do not require strong adhesion but require heat resistance, flame resistance, etc. There is no problem in applying it to any purpose.

Using these fibers as raw materials, knitting, braiding, etc. are performed using conventional methods to produce a net-like structure.

The structure of the structure has a so-called net-like or lattice-like shape, and it is essential that spaces are formed between the meshes.

Next, as the coating material for covering the network structure, any moldable polymer such as chloroprene rubber, styrene-butadiene rubber, nitrile-butadiene rubber, vinyl chloride resin, polyethylene resin, etc. can be used.

At this time, various additives such as pigments, plasticizers, and stabilizers are usually used.

To coat the network structure with rubber or synthetic resin, a roll calender method is most preferred, but it is also possible to adhere a prefabricated film or sheet.

Further, the use of one net-like structure is not limited, and one embodiment of the present invention is to overlap two or more net-like structures and cover them with the above-mentioned covering material.

In either method, in the present invention, the network structure is coated with rubber or synthetic resin to form a sheet-like product.

Formation of a mesh from the coated sheet-like laminate is carried out by punching out the center of the mesh using a press and removing this portion.

At this time, accurately regulate the position of the mesh to avoid damaging the base material or
It is necessary to define the lengthwise and widthwise positions of the net-like structure in advance so that the mesh positions do not shift.

Embodiments of the above manufacturing method will be described below with reference to the drawings.

In FIG. 1, a network structure 1 braided from organic or inorganic fibers is pulled out by a winding roller and then rolled through roll calenders 2, 2', 3.3', 4.4' and made of rubber or plastic. Compounds 5 and 51 are coated,
A covering sheet 6 is formed.

The covering sheet 6 is punched out only in the central portion of the mesh by a pair of press rolls 7.8.

The press roll 7.8 is interlocked with a feed roller 9 which defines the mesh position, so that the center part of the mesh is accurately press punched.

The reticulated molded sheet 10 on which the mesh has been formed is then sent to the post-processing section 1.
Vulcanization or post-treatment is performed by step 1 to obtain a net-like molded product 12.

FIG. 2A is a plan view of a net-like molded product manufactured by the method of the present invention, and the opening in FIG. 2 is a sectional view taken along the line A-A.

As shown in the figure, the reinforcing net structure (net fabric) 23 is completely and substantially uniformly covered all over with a covering material (resin) 24, and the sheets between the meshes are punched out and removed. There are many spaces 22 formed by

Although this space has a uniform shape and size in the figure, the shape and size may be varied or mixed as desired.

Example 1 A knotless net with a mesh size of 25.4 mm on one side and a width of 1.5 m, knitted with 840 denier nylon thread, was coated with a resin compound mainly composed of vinyl chloride [Zeon 103EP (Nippon Zeon Co., Ltd.) from both front and back sides. ff), l, 180
Valley 1.5 Irt11L by 0C roll calendar
It was made into a thick sheet and glued together.

After joining, the composite sheet was punched out along the mesh to form a square of 25 mm on each side to form a composite network structure, which was then heat-treated at 180° C. for 10 minutes.

This net-like structure has excellent flame retardancy and weather resistance, and is suitable as a net for other types of industrial use.

Example 2 Two strands of 1300 denier polyester threads were twisted, each side of the mesh was 5 (1771 knotted mesh was 1 m wide), and chloroprene rubber and neoprene W (trade name of Showa Neoprene Co., Ltd.) were assembled using the conventional method. A sheet with a thickness of 6 mm was prepared using a roll calender, and two sheets were joined and pressed from both the front and back sides of the knotted mesh to obtain a composite sheet with a thickness of 12 mm.

After cutting the central part of the mesh of this composite sheet into a lattice shape having a space of 4CIJ1 on one side using a punching press, 15
It was vulcanized by heat treatment at 0° C. for 30 minutes to obtain a rubber-reinforced network structure.

This fiber-reinforced rubber mesh molding has a width of 50 cm.
The material was cut to the required length so that it could be attached to the tread of an automobile tire, and a removable fixing bracket was attached to the tire to serve as an alternative to snow chains.

As described above, the present invention provides a method for producing an excellent general-purpose molded product, which is relatively easy to manufacture and can be used for various purposes such as construction nets, seawall nets, and rockfall prevention nets. The industrial effect is remarkable.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the manufacturing process of the present invention, FIG. 2A is a partially developed plan view of a net-like molded product obtained by the method of the present invention, and the opening of FIG. 2 is a sectional view thereof.

Claims (1)

[Scope of Claims] 1. A net-like structure that has been made magnetically permeable in advance is stretched with its longitudinal and widthwise positions defined, and then the entire surface of the net-like structure is covered with a formable coating material to form a sheet-like structure. Tonashi,
A method for producing a net-like molded article, characterized in that the middle portion of the mesh is then punched out and removed. 2. The method for producing a net-like molded article according to claim 1, wherein the net-like structure is braided using fibers. 3. The method for producing a reticulated molded article according to claim 1, wherein the moldable covering material is at least one plastic material selected from the group consisting of natural rubber, artificial rubber, and synthetic polymer resin. 4. A method for manufacturing a net-like molded product according to claim 1, in which two or more net-like structures are coated together. A method for producing a reticular molded article according to item 1 or 4.