JP3411026B2 - Rust prevention sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust preventive sheet used for packaging metal products such as metal coils.

[0002]

2. Description of the Related Art When a metal product made of a steel material, a copper alloy material or the like is packed in a paper wrapping material, a cardboard box or the like for storage or distribution, the paper wrapping material or the cardboard box absorbs moisture and moisture. May cause rust on metal products. Further, in the case of a metal product having a large latent heat, dew condensation occurs, and similarly, moisture may cause rust on the metal product.

Conventionally, in order to prevent rusting of metal products,
A means for packaging a metal product using rust-preventive paper obtained by impregnating paper with a rust-preventive agent has been proposed. In this method, the rust-preventive agent vaporized from the rust-preventive paper adheres to the surface of the metal product, thereby preventing the metal product from rusting. However, since some of the vaporized rust preventive agent is scattered outside the rust preventive paper, the rust preventive effect does not last long if the vaporization speed is too fast. And
When the packaged metal product is stored for a long period of time, rust may occur due to water entering from the outside through the rustproof paper.

There has also been proposed a rust preventive paper in which a synthetic resin layer made of polyethylene, polypropylene or the like is laminated on one side of a paper impregnated with a rust preventive agent. In this rustproof paper, the synthetic resin layer prevents the rustproofing agent from scattering to the outside, and the rustproofing effect continues for a long time. In addition, since the synthetic resin layer prevents intrusion of moisture from the outside, it is possible to prevent rusting of the metal product to be packaged. However, even if the rustproof paper itself having such a synthetic resin layer laminated is used as recycled paper, the synthetic resin hardly disaggregates in water, so the synthetic resin is mixed as an impurity in the recycled paper, Will reduce the quality of.

Therefore, these rust-preventive papers are rarely reused, and in view of environmental problems and the like, it is not suitable for the recent situation in which recycling of products made from paper is becoming a common sense. It's coming. For this reason, recently, instead of paper, a packaging material in which a rust preventive agent is applied to a synthetic resin film or kneaded with the rust preventive agent is generally used, and a synthetic resin containing a rust preventive agent is further used. There is also known a film (for example, a polyethylene film containing a rust preventive agent) laminated with a synthetic resin such as a laminate resin. Further, for the purpose of supplementing the strength of a synthetic resin laminated film containing a rust preventive agent, a rust preventive film sheet in which a cloth woven with a yarn made of a synthetic resin is laminated is also known. These rustproof film sheets are preferable as a packaging material for metal products and the like from the viewpoint of moisture resistance and strength.

[0006]

However, a rust preventive film sheet obtained by laminating a synthetic resin such as a laminate resin on one surface (surface) of a synthetic resin film containing a rust preventive agent and laminating a cloth layer on the synthetic resin layer. When packaging products such as metal with, the product is covered with the rust preventive synthetic resin film surface, and the cloth layer is exposed to the external environment. There is a problem that the product cannot enter the (gap) and cannot be removed, and that the surface of the cloth has irregularities due to the stitches, which makes it difficult to attach the product label to the cloth. Further, in the industry, it has been desired to develop a rust preventive packaging material having a higher rust preventive effect.

[0007]

The present invention made to achieve the above object is as follows. (1) a single layer or two or more layers of synthetic resin layers laminated on one surface of the flat yarn cloth for kneading volatile corrosion inhibitor, other surface of the flat yarn cloth having a plurality of irregularities, the At least one synthetic resin layer is gas impermeable
An anti-corrosion sheet characterized by its excellent properties . (2) The rustproof sheet according to (1) , wherein the material of the flat yarn used for the flat yarn cloth is a thermoplastic resin. (3) The rustproof sheet according to (1) or (2) , wherein the surface of the flat yarn used for the flat yarn cloth has irregularities.

Since the rust preventive sheet of the present invention is provided with a flat yarn cloth in which a rust preventive agent is directly kneaded, if one side of the cloth is used to wrap an object to be packaged (for example, a metal product), it is flat. The rust preventive agent vaporized from the yarn cloth adheres to the surface of the object to be packaged and prevents the generation of rust. In addition,
The flat yarn cloth used in the present invention has a plurality of irregularities derived from the shape of the surface of the yarn and / or the texture of the cloth. The "plurality of unevenness derived from the weave of the cloth" in the present invention means unevenness generated on the surface of the cloth due to the thickness of the yarn and the weave of the yarn due to the intersection of the warp yarn and the weft yarn.

By using the rust preventive sheet of the present invention,
The effective surface area of the surface that covers the article to be packaged is substantially wider than that in the case where it is coated with a flat surface, and the vaporizable rust preventive agent effectively acts on the surface of the article to be packaged.
In addition, since this rust preventive sheet has a single layer or two or more layers of synthetic resin on the surface of the flat yarn cloth that does not come into contact with the object to be packaged, the synthetic resin layer prevents moisture from entering from the outside. Therefore, it is possible to prevent rusting of the metal product to be packaged.

Further, as a preferred embodiment of the present invention, if at least one of the synthetic resin layers of the rust preventive sheet is made substantially gas impermeable, the vaporized rust preventive agent is effectively prevented from scattering to the outside, The rust preventive effect can be maintained for a long period of time.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing a part of a rust preventive sheet according to an embodiment of the present invention. This rustproof sheet is formed by laminating a synthetic resin layer 9 on the lower surface of the flat yarn cloth 3. Here, the synthetic resin layer 9 is a single layer, or two or more layers (for example, if two layers,
It is a synthetic resin layer of synthetic resin layers 5 and 7) in the figure.

In the present invention, the flat yarn cloth 3
Examples of the material of the flat yarn used for include thermoplastic resins such as polyolefin-based resins, specifically, polyethylene, polypropylene, polyolefin,
Examples thereof include polyester, nylon, polyvinyl chloride, polystyrene, and polycarbonate. Among them, polyethylene, polypropylene, polyolefin and the like are preferable in terms of processability and cost. The method for spinning these is not particularly limited, and a known method can be used, and examples thereof include a regular spinning method, a composite spinning method, a spunbond method, and a meltblowing method. Here, the weaving degree of the fiber to be spun is not particularly limited, but it is preferable to have a certain thickness in order to increase the effective area by highlighting the unevenness derived from the texture when weaving into a cloth, for example, , 500 denier or more and 2000 denier or less, more preferably 800
It may be denier or more and 1200 denier or less. These fibers are made into cloth using a known loom, for example, a water jet loom, a Sulzer loom, or the like.

The type of the vaporizable rust preventive agent used in the present invention is appropriately selected depending on the material of the object to be packaged (metal product etc.). Specific examples of the volatile rust preventive agent include, for example, fatty acid salt, benzoate, nitrite, benzotriazole, dicyclohexylammonium nitrite, dicyclohexylamine benzoate, cyclohexylamine carbonate, monoethanolamine benzoate, simple substance of urea, or a complex thereof. Is used.

In the present invention, the method of directly kneading the volatile anticorrosive agent into the flat yarn is not particularly limited, and a usual method can be used, for example, a masterbatch method, a dry blending method or the like. The content of the volatile anticorrosive agent in the flat yarn cloth 3 is 0.1% by weight or more based on the weight of the resin used as the material of the flat yarn, 1
It is preferably 0% by weight or less, particularly preferably 0.5% by weight or more and 5% by weight or less. If the content is less than the above range, the rust preventive effect may be insufficient, which is not preferable. On the contrary, when the content exceeds the above range and the rust preventive agent is excessively present, the effect is not further increased, but the spreadability of the resin as the material of the flat yarn is gradually deteriorated, which is not preferable.

Next, a typical example of the manufacturing process of the flat yarn 3 will be briefly described. (1) A molten resin containing a predetermined amount of rust preventive agent is extruded from a die (die) and controlled to a predetermined film thickness while blowing air. (2) By inserting a blade into (1), slit to a predetermined thickness. (3) (2) is stretched by applying tension in the machine direction while applying heat with a stretching plate. (4) (3) is wound on a bobbin to make warp and weft.

Here, by changing the shape of the inner lip and / or the outer lip of the die (die) in (1), it is possible to provide various irregularities on the flat yarn to increase the effective surface area. A normal die has a circular shape for both the inner lip and the outer lip, but, for example, as shown in FIG. 2, the inner surface of the outer lip 11 (that is, a gear type line in the outer lip 11 in FIG. The inner surface of the inner lip 13 shown in FIG. 5, which will be described later, has a circular shape with gear-shaped irregularities, and the outer surface of the inner lip 13 (that is, the portion indicated by the outer circle of the inner lip 13 of FIG. 2). The outer surface in FIG. 6, which will be described later), has a regular circular shape with no unevenness, thereby providing unevenness on the surface of the flat yarn, and by plain weaving this, the upper portion of the flat yarn cloth 3 in FIG. As illustrated on the surface, gear-like unevenness can be provided.

Further, the shape of the die (base) is shown in FIG.
It is possible to provide unevenness of different shapes on the surface of the cloth by forming the shapes as shown in FIG. 4, respectively. The shape of the outer lip 11 of the die (base) 10 in FIG. 2 is illustrated in FIG. 5, and the shape of the inner lip 13 of the die (base) 10 in FIG. 2 is illustrated in FIG. Further, like the outer lip, it is also possible to provide the outer surface of the inner lip 13 with unevenness to provide unevenness on the surface of the flat yarn. For example, as illustrated in FIG. 7, it is possible to provide gear-shaped unevenness on the outer surface of the inner lip 13. Further, providing unevenness on both the outer side surface of the inner lip 13 and the inner side surface of the outer lip 11 is also one method.

As described above, in the die (base), the inner surface of the outer lip 11 and / or the inner lip 1 is
By providing unevenness on the outer side surface of No. 3, it is possible to provide unevenness on the flat yarn surface, and the effective surface area of the flat yarn cloth 3 surface is substantially smaller than the effective surface area when covered by the uneven surface. Wide range. Therefore, it is possible to increase the amount of the volatile rust preventive agent that comes into contact with the surface of the article to be packaged per unit area, and to improve the rust preventive effect. Therefore, the rust preventive sheet of the present invention has an effective surface area selected such that an effective amount of the rust preventive agent works in accordance with the degree of rusting of the packaged object (for example, the rust preventive of the present invention. The effective surface area of the sheet
110% to 120 for a sheet with no irregularities
%). Further, the effective surface area can be further increased by increasing the degree of the plurality of irregularities derived from the texture of the cloth.

In the present invention, the term "effective surface area" refers to the surface area of a part of a package which is in contact with the surface of a substance when the surface of a substance is closely packed with a sheet-like package, The area of the uneven portion is added to the surface area of the package having unevenness on the surface.

Next, the synthetic resin layer 9 will be described. As illustrated in FIG. 1, on the lower surface of the flat yarn 3,
A single layer or two or more synthetic resin layers 9 are laminated. That is, the synthetic resin layer 9 may be a single layer, or may be a laminate of two or more layers. The number of synthetic resin layers to be laminated depends on the storage condition of the target packaged object. It may be determined according to.

As the synthetic resin layer 9, it is preferable to use a gas impermeable material from the viewpoint of preventing the moisture and rust preventive from flowing out. Examples of such materials include polyolefin, polyester, nylon and poly. Examples thereof include vinyl chloride, polystyrene, polycarbonate, polyvinyl alcohol, polyethylene oxide and the like.

In the present invention, "impermeable to gas"
The term "maintains a property capable of substantially preventing gas inflow and outflow." Here, the thickness of the synthetic resin layer 9 used in the present invention is not particularly limited, and is 8 μm or more and 1
It is generally about 00 μm or less (when each layer is composed of a plurality of layers, each layer has such a thickness).

The synthetic resin layer 9 is laminated by laminating the synthetic resin layer on one surface of the flat yarn cloth 3 by dry lamination, wet lamination, extrusion lamination or the like to form the rustproof sheet 1 of the present invention. It When the synthetic resin layer is a plurality of layers, they may be sequentially laminated in the same manner as above.

Here, a constitutional example of the rust preventive sheet of the present invention will be exemplified below with reference to FIG.

(1) Sodium nitrite (trade name "sodium nitrite" manufactured by Nissan Chemical Industries, Ltd.) 0.7% by weight, benzotriazole (trade name "BELSON CRYSTAL # 120K" manufactured by Daiwa Kasei). 3 weight percent and 99 weight percent low density polyethylene are heat mixed,
Obtain a resin containing a rust inhibitor. Using a film layer obtained by extruding this rust-preventive agent-containing resin from a die (die) having the shape shown in FIG.
A flat yarn having irregularities on its surface is produced with 1000 denier. Using this yarn, the number of warp threads and weft threads is set to 6 per inch, and the flat yarn cloth 3 is woven in a plain weave having an effective surface area of 120% with respect to the surface having no irregularities.

Low density polyethylene resin (thickness 20 μm) and biaxially oriented polypropylene (OPP) film (thickness 20 μm) were laminated on the flat yarn cloth 3 as the synthetic resin layer 5 and the synthetic resin layer 7, respectively, by the extrusion laminating method. The rust preventive sheet 1 is prepared.

(2) Sodium nitrite (trade name "sodium nitrite" manufactured by Nissan Chemical Industries, Ltd.) 0.3% by weight, benzotriazole (trade name) "Berzone Crystal # 120K" manufactured by Daiwa Kasei Co., Ltd. 0 0.7% by weight and 99% by weight of low-density polyethylene are mixed by heating to obtain a resin containing an anticorrosive agent. This resin containing rust preventive agent is shown in Fig. 2.
Using a film layer extruded from a die (die) having the shape shown in, a flat yarn having irregularities on its surface is produced at 1000 denier. Using this yarn, the number of warp threads and weft threads is set to 6 per inch, and the flat yarn cloth 3 is woven in a plain weave having an effective surface area of 120% with respect to the surface having no irregularities.

A high density polyethylene resin (thickness: 20 μm) and a biaxially oriented polypropylene (OPP) film (thickness: 20 μm) were laminated on the flat yarn cloth 3 as a synthetic resin layer 5 and a synthetic resin layer 7, respectively, by an extrusion laminating method. The rust preventive sheet 1 is prepared.

(3) Sodium nitrite (trade name "sodium nitrite", manufactured by Nissan Chemical Industries, Ltd.) 1.0% by weight, benzotriazole (trade name "BELSON CRYSTAL # 120K", manufactured by Daiwa Kasei) 0. 5 weight percent and 99 weight percent polypropylene are heated and mixed to obtain a resin containing a rust preventive agent. A resin layer containing this rust preventive agent was extruded from a die having a shape shown in FIG.
A flat yarn having irregularities on its surface is prepared with a denier of 00. Using this yarn, the number of warp threads and weft threads is set to 6 per inch, and the flat yarn cloth 3 is woven in a plain weave having an effective surface area of 120% with respect to the surface having no irregularities.

A polypropylene resin (thickness: 20 μm) and a biaxially oriented polypropylene (OPP) film (thickness: 20 μm) were laminated on the flat yarn cloth 3 as a synthetic resin layer 5 and a synthetic resin layer 7, respectively, by an extrusion laminating method, and a cloth was obtained. A rust preventive sheet 1 is prepared in which the layers and all synthetic resin layers are made of polypropylene.

The rust preventive sheet 1 is used for packaging so that the surface of the flat yarn 3 (the surface on the uneven side when unevenness is provided) directly contacts the object to be packaged. Therefore,
The rust preventive agent is vaporized from the flat yarn 3 and adheres to the surface of the packaged object to prevent rust from being generated. The synthetic resin layer 9 located on the outside prevents moisture from entering from the outside, and
Prevents the rust preventive agent from scattering to the outside. Further, since the rust preventive sheet of the present invention uses the flat yarn as a constituent material,
Mechanical strength is higher than that made of paper and plastic, and even when packaging products with corners and protrusions,
Does not break. Further, if the outermost synthetic resin layer is a synthetic resin film, the surface is smooth, which is suitable for work such as sticking a label and directly writing on the film. Furthermore, if the cloth layer and the synthetic resin layer are all heat-sealable synthetic resin layers, it is possible to wrap the object to be packaged by heat sealing.

The structure of the rust preventive sheet of the present invention is shown in FIG.
It is not limited to the configuration shown in FIG. For example,
Various specifications can be changed without changing the gist of the present invention, such as providing a printing layer or providing another reinforcing layer.

[0034]

As described above, according to the present invention,
It is possible to provide a rust preventive sheet having a high rust preventive effect, which can control the effective surface area in contact with the surface of a packaged object.

[Brief description of drawings]

FIG. 1 is a sectional view showing a part of a rust preventive sheet according to an embodiment of the present invention.

FIG. 2 is an example of a cross-sectional view of a die (die) used for manufacturing a flat yarn for a rust preventive sheet according to an embodiment of the present invention.

FIG. 3 is an example of a cross-sectional view of a die (die) used for manufacturing a flat yarn for a rust preventive sheet according to an embodiment of the present invention.

FIG. 4 is an example of a cross-sectional view of a die (die) used for manufacturing a flat yarn for a rust preventive sheet according to an embodiment of the present invention.

5 is a perspective view of an outer lip used in the die (base) shown in FIG. 2. FIG.

FIG. 6 is a perspective view of an inner lip used in the die (base) shown in FIG.

FIG. 7 is an example of a cross-sectional view of a die (die) used for manufacturing a flat yarn for a rust preventive sheet according to an embodiment of the present invention.

[Explanation of symbols]

1 ... rust prevention sheet 3 ... Flat yarn cross 5, 7, 9 ... Synthetic resin layer 10 ... Die 11 ... Outer lip 13 ... Inner lip

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ identification code FI B65D 81/24 B65D 81/24 F 85/00 85/00 P (58) Fields investigated (Int.Cl. ⁷ , DB name) C23F 11/00 B32B 27/00 B32B 27/12 B32B 27/18 B65D 65/42 B65D 81/24 B65D 85/00

Claims (3)

(57) [Claims] 1. A single layer or two or more layers of synthetic resin layers are laminated on one surface of a flat yarn cloth mixed with a volatile anticorrosive agent, and the other surface of the flat yarn cloth has a plurality of irregularities. A rust preventive sheet , wherein at least one of the synthetic resin layers is gas impermeable . 2. The rust preventive sheet according to claim 1, wherein the material of the flat yarn used for the flat yarn cloth is a thermoplastic resin. 3. The rust preventive sheet according to claim 1 or 2, wherein the surface of the flat yarn used for the flat yarn cloth has irregularities.