JPS587710B2 - Method for manufacturing synthetic resin-coated metal long objects - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a synthetic resin-coated metal elongate article.

2. Description of the Related Art Synthetic resin-coated long metal objects, such as iron wire, which are made by adhering a synthetic resin film to the surface of long metal objects, are used for various purposes, such as being bent into wire meshes.

Conventionally, as a method for manufacturing a synthetic resin-coated metal long article, as shown in Japanese Patent Publication No. 36-18680,
In order to improve the adhesion of the adhesive to the surface of the long metal object, a surface treatment liquid containing phosphoric acid or a phosphate as a main component is applied to the surface of the long metal object, and then the surface of the long metal object is treated. After washing the long object with water or hot water to completely remove the surface treatment liquid adhering to its surface, dry it and apply adhesive on it.
Furthermore, a synthetic resin was coated over it.

That is, after surface treatment, washing and drying steps were required.

Therefore, long equipment is required for washing and drying, energy consumption is large, surface treatment time is required, and phosphoric acids are contained in the waste water due to water washing, making the waste water treatment troublesome in order to prevent pollution.

In addition, in order to shorten the surface treatment time as much as possible and solve the pollution problem, Japanese Patent Application Laid-open No. 51-65041 describes a technique in which the water washing step after surface treatment is omitted, but this method still requires the drying and baking step. The equipment costs and energy consumption for this cannot be ignored.

In view of the current situation as described above, the present inventors have conducted various studies on a method that does not require washing and drying processes for surface treatment liquid adhering to the surface of a long metal object, and as a result, they have completed the present invention. It is something that

The gist of the present invention is to apply a surface treatment liquid containing phosphoric acid or a phosphate as a main component to the surface of a long metal object, and then wrap a string around the long metal object and squeeze the surface. A process for producing a synthetic resin-coated metal elongated object is characterized in that a treatment liquid adhering to the metal object is removed, an adhesive is applied thereon and dried, and a synthetic resin is further applied thereon.

The long metal objects used in the present invention include wire rods, tube materials,
The surface of a belt-like material can be continuously coated with a synthetic resin, and iron is preferably used as the material.

There are no particular restrictions on the synthetic resin for coating used in the present invention, and any synthetic resin may be used, such as polyvinyl chloride resin, polyethylene resin, etc., as appropriate depending on the purpose.

The most suitable adhesive to be used in the present invention is determined depending on the long metal object and the type of synthetic resin for coating.For example, if the long metal object is iron wire and the synthetic resin for coating is polyvinyl chloride. In the case of resin, a solvent-based adhesive such as one in which an epoxy resin and an acrylic resin are dissolved in methyl ethyl ketone is preferably used.

The solvent for this adhesive may be any solvent as long as it dissolves the resin that is the adhesive component, but it is better to use a solvent that is compatible with water, which is the solvent for the surface treatment liquid, so that the surface treatment liquid remains on the long metal. It is preferable because it blends well and can be applied uniformly when applying the adhesive to an object.

In the present invention, in order to remove the surface treatment liquid adhering to the surface of a long metal object, it is sufficient to wrap a string around the long metal object and squeeze it. Abrasive materials are preferred, such as nylon, vinylon, etc.

Even if the surface treatment liquid is removed in this manner, the surface treatment liquid remains attached to the surface of the long metal object in the form of a very thin layer, and the surface treatment liquid can sufficiently function as a surface treatment liquid.

When removing this surface treatment liquid, if too much surface treatment liquid remains on the surface of the long metal object, it will mix with the adhesive and impede its adhesive force, so it is preferable that the remaining amount is small.

Next, as an example of implementing the present invention, a case of a polyvinyl chloride resin-coated iron wire will be described with reference to the drawings.

In the figure, 1 is a surface-cleaned iron wire, which is unwound from an unwinder 2, and a surface treatment liquid containing phosphoric acid or a phosphate as a main component (for example, manufactured by Nippon Parkerizing ■) is applied to the surface in a surface treatment liquid tank 3. Perco Cleaner #251) is applied.

4 is a surface treatment liquid removing machine, and as shown in FIG. 2, a nylon rope 41 is wound around the iron wire 1.
is passed through the insertion groove 43 of the stopper 42.

The rope 41 is stopped by a stopper 42, and as a result, the iron wire 1 is squeezed by the rope 41, and most of the surface treatment liquid applied and attached to the surface of the iron wire 1 is removed, and the iron wire 1 is A very thin layer of surface treatment liquid is left behind.

This removed surface treatment liquid is returned to the surface treatment liquid tank 3.

5 is an adhesive applicator, and an adhesive in which epoxy resin and acrylic resin are dissolved in methyl ethyl ketone is applied to a tank 51.
The adhesive is applied onto the surface of the iron wire 1 with some surface treatment liquid still attached to the surface.

Reference numeral 6 denotes a dryer, in which the iron wire 1 coated with adhesive is heated to volatilize the solvent as well as the solvent of the remaining surface treatment liquid.

Therefore, the surface of the iron wire 1 is treated with the surface treatment liquid between the surface treatment liquid tank 3 and the dryer 6, and is heated in the dryer 6, so that the surface treatment is sufficiently performed. .

Next, a soft polyvinyl chloride resin is extruded by an extruder 7, and passed through a crosshead mold 71 to cover and adhere the polyvinyl chloride resin to the surface of the iron wire 1, which has been coated with an adhesive and dried.

8 is a cooling tank in which the coated iron wire 1 is cooled;
The wire is taken up by a take-up machine 9 and wound up by a wind-up machine 10 to produce a polyvinyl chloride resin-coated iron wire product.

The polyvinyl chloride resin coated iron wire manufactured in this way does not cause corrosion on the surface of the iron wire, the iron wire is firmly coated with polyvinyl chloride resin via an adhesive, and its surface condition is also good. Ta.

As mentioned above, the method for producing a long synthetic resin-coated metal object of the present invention does not require washing and drying of the surface treatment liquid, so energy consumption is saved accordingly, wastewater treatment equipment is not required, and the surface treatment process The time has been greatly shortened, equipment costs have been reduced, and manufacturing speed has been improved, resulting in high production efficiency.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram of an example of the manufacturing method of the present invention, and FIG. 2 is a perspective view showing an example of a surface treatment liquid removing machine. 1... Iron wire, 3... Surface treatment liquid tank, 4
...Surface treatment liquid removal machine, 41 ...Rope, 5 ...Adhesive applicator, 6 ...Dryer, 7 ...・Extruder.

Claims (1)

[Scope of Claims] 1. A surface treatment solution containing phosphoric acid or a phosphate as a main component is applied to the surface of a long metal object, and then a string-like body is wrapped around the long metal object and the surface is squeezed. A method for producing a synthetic resin-coated long metal object, which comprises removing a treatment liquid adhering to the surface, applying an adhesive thereon and drying it, and then covering the same with a synthetic resin. 2. Claim 1 in which the long metal object is made of iron, the adhesive is epoxy resin and acrylic resin dissolved in methyl ethyl ketone, and the synthetic resin is polyvinyl chloride resin. A method for producing a synthetic resin-coated metal elongated article according to item 1 or 2.