JPH11350395A - Packaging paper for metal product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging paper for metal product having high rust- proofing effect and producible at a low cost. SOLUTION: A vaporizable rust-proofing agent such as benzotriazole is supported on a packaging paper in a manner to evaporate the agent to the inner side of the package by applying the agent to the inner face of the packaging paper or impregnating in the paper and a water-repelling treatment is applied to the outer face of the paper. The water-repelling treatment is carried out e.g. by applying a water-repelling agent to the outer face of the packaging paper. The permeation of water attached to the surface of the package can be prevented and the water in the package is evaporated and dissipated without being condensed on the inner surface of the paper. It is easily disposable and is easily producible at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrapping paper for metal products which has a high rust-preventing effect and can be manufactured at a low cost, and more particularly to a method for wrapping a copper wire drawn around a bobbin or a coil. The present invention relates to wrapping paper for metal products suitable for:

[0002]

2. Description of the Related Art Metal products, such as metal raw materials or semi-finished or finished products including metal or metal parts, are not surface-treated and exposed metal parts are rusted during transportation or storage. It is packaged to prevent it from getting dirty. There are various methods for packaging, for example, copper wire drawn in copper wire and wound on a bobbin or coil is wrapped with film wrap,
Alternatively, kraft paper, rust-proof paper, and the like are used as packaging materials. At present, rust preventive paper is coated with or impregnated with a vaporizable rust inhibitor based on kraft paper, etc., and is coated with a vaporizable rust inhibitor based on polyethylene laminated (laminated or sanded). Or impregnated are mainly sold.

[0003]

However, although the film wrap can prevent water from entering from outside,
Depending on the temperature change after packaging, the moisture inside the bobbin may condense on the inner surface of the wrap film and cause the surface of the copper wire to change color. It is also difficult to dispose of the wrap film after use. Kraft paper has a dustproof effect but no rustproof effect. Rust prevention paper made by applying or impregnating a rust inhibitor to kraft paper has a rust prevention effect in a normal atmosphere, but when water etc. hangs on the outside, water penetrates into the bobbin through the paper,
Rust prevention effect may be lost. As in the case of film wrap, polyethylene-based rust-preventive paper still has problems of dew condensation and waste treatment, and is expensive because secondary processing is added in the process of producing rust-preventive paper.

Accordingly, an object of the present invention is particularly suitable for packaging a metal product such as a product obtained by drawing a copper wire and winding it around a bobbin or a coil, and has a high anticorrosive effect and can be obtained at low cost. It is to provide a wrapping paper for metal products.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for supporting a vaporizable rust inhibitor on the inner surface of a wrapping paper and applying a water repellent treatment to the outer surface. The wrapping paper for metal products was constructed as follows.

According to the metal product wrapping paper of the present invention,
Even if water is applied to the outer surface, it does not penetrate into the metal products packaged by the water repellent process, and since it is made of paper unlike a film, it is breathable and the moisture inside is condensed on the inner surface of the wrapping paper Vaporizes and diverges without doing. Also, since the film is not laminated, it can be recycled as waste paper, and there is no problem of waste disposal. Further, since secondary processing such as lamination of polyethylene is not required in the production, it can be produced at low cost.

[0007] The rust inhibitor is preferably supported by being applied to the inner surface of the wrapper. The rust inhibitor can be appropriately selected depending on the type of metal product to be packaged. For example, in the case of wrapping paper for copper products, a rust inhibitor exclusive to copper and copper alloy is selected. The water repellency processing can be performed by applying a water repellent to the outer surface of the wrapping paper.

[0008]

Embodiments of the present invention will be described below.

The support of the rust inhibitor is preferably uncoated such as high-quality paper or kraft paper. For example, those having a low content of harmful ions such as chloride ions and sulfate ions which cause copper rusting are preferred. Is more desirable. The grammage is
Those having a weight of 50 to 180 g / m ² are preferred for use as wrapping paper.

Examples of the vaporizable rust inhibitor include benzotriazole, tolyltriazole, and derivatives thereof known for copper and copper alloys, and those having a pyrrole, pyrazole ring, thiazole ring, imidazole ring, and mercapto group. Alternatively, so-called heterocyclic compounds such as thioureas may be mentioned. Alcohols, to adjust the vapor pressure of the rust inhibitor, that is, the sublimation (vaporization) rate;
Esters, amines and the like may be mixed.

For other metals, such as iron and iron alloys, zinclohexylammonium nitrite (DICHAN), dicyclohexylammonium caprylate, cyclohexylamine carbamate (C
HC), cyclohexylammonium laurate, diisopropylammonium nitrite (DIPA)
N), ammonium nitronaphthalene nitrite (NITAN), DICHAN 80% + DIPAN20
%, Sodium nitrite + urea or ultratropin, mono- and dinitrobenzoates of various amines, sodium nitrite +
And ammonium benzoate. Other various metals and their alloys are also applicable.

Examples of the water repellent for water repellency processing include fatty acid derivatives, synthetic resins, silicones, chromates, fluororesins, paraffin, ethylene urea, pyridine, polyethylene wax, paraffin wax, carnauba wax, Waxes such as candelilla wax, ester wax, oxidized wax, rice wax, and petroleum resin wax. They may be provided with slip resistance or may be mixed with a surfactant or the like. The method of water repellency processing is not limited, but a method of significantly impairing the air permeability of paper, such as hardening with resin or forming into a film, is excluded. For example, a process such as laminating a film made of a material that allows steam to pass but blocks water to the outer surface of the wrapping paper can be applied. Alternatively, by mixing a coloring ink with a water-repellent agent, the front and back of the wrapping paper can be easily distinguished.

[0013] The coating amount of the volatile rust inhibitor can be appropriately determined according to the conditions of use and the like.
m ² is common. As a method of applying the above-mentioned material, the material can be manufactured by applying a gravure coat, a Meyer bar, a roll coat, a blade coat, a knife coat, a spray coat or the like, and then drying.
In addition, it can also be supported by impregnation into paper as a support or by internal addition when paper is made.

[0014]

Embodiments of the present invention will be described below. (Example 1) Neutral kraft paper having a basis weight of 80 g / m ² (made using a neutral sizing agent such as an alkyl ketene dimer without using a sulfate band as a size fixing agent. Trade name; unexposed) Neutral paper, manufactured by Tokai Pulp Co., Ltd.) as a base paper and a benzotriazole-based rust inhibitor (trade name: Merit DL) on one side using a gravure coater (150 mesh, gravure roll with a depth of 50 microns) -130CS, Fukoku Oil Co., Ltd.) 80% solution (effective content 60%) was applied at a coating amount of 6 g / m ² . At the same time, on the other side of the same neutral kraft paper, using the same gravure coater, a 65% solution of a water-repellent agent (trade name: Paratex NS-6, manufactured by Misawa Ceramics Co., Ltd.) as a wax / special resin emulsion. (Effective component: 20%) was applied so that the coating amount was 2 g / m ² . Thereafter, drying was performed at a drying temperature of 100 ° C. for 15 seconds with hot air by steam using a drying device attached to a gravure coater to obtain a copper wire wrapping paper of Example 1.

(Example 2) Neutral high-quality paper having a basis weight of 81.4 g / m ² (a paper made by using a neutral sizing agent such as an alkyl ketene dimer without using a sulfate band as a size fixing agent). Brand name: OK fine quality, manufactured by Oji Paper Co., Ltd.) as a base paper, and a wax-based water repellent (brand name: Brighton FC-105, manufactured by Sakata Inx Co., Ltd.) as a water repellent, 66 parts by weight; A solution (effective component 20%) in which 1 part by weight of a brown coloring ink, a trace amount of an antifoaming agent (trade name; defoaming agent for Brighton FC-105, manufactured by Sakata Inx Co., Ltd.), and 33 parts by weight of water were mixed was used. The same operation as in Example 1 described above was repeated except that the copper wire wrapping paper of Example 2 having different front and back colors was obtained. The coloring inks are AQUA PS23 yellow 77%, AQUA P manufactured by Toyo Ink Mfg. Co., Ltd.
It was manufactured by mixing S16 red 14% and Akwa PS92 ink 9% (all trade names).

(Evaluation) A rust prevention test and a water repellency test were respectively performed by the following methods. Rust prevention test method ・ Temperature cycle test Specimen Copper plate JIS-H-3100 (C1100P, tough pitch copper, Cu 99.90 or more) Packaging The copper plate is caramel-wrapped and sealed in a single layer in each example, and both ends are fixed with adhesive tape. Test conditions Temperature 50 ° C, Humidity 95%, 16 hours Temperature 5 ° C, Humidity 95%, 8 hours The above is one cycle, and the dew condensation phenomenon is forcibly repeated on the test piece to promote rusting. Water repellency test method It was carried out in accordance with JIS P-8137.

Table 1 shows the evaluation results of Examples 1 and 2.

[Table 1]

[0018]

As described above, according to the wrapping paper for metal products according to the present invention, a wrapping paper having a high rust-preventing effect can be obtained at a low cost.

Claims (4)

[Claims] 1. A wrapping paper for metal products, wherein a vaporizing rust inhibitor is supported on the inner surface side of the wrapping paper so as to be vaporized, and the outer surface is subjected to water repellency. 2. The rust inhibitor is supported on the wrapping paper by being applied to an inner surface of the wrapping paper.
A wrapping paper for a metal product as described in. 3. The wrapping paper for metal products according to claim 1, wherein the rust inhibitor is used exclusively for copper and copper alloys, and is a wrapping paper for copper products. 4. The wrapping paper for a metal product according to claim 1, wherein the water repellency processing is performed by applying a water repellent to an outer surface of the wrapping paper.