JP2010215281A - Rust-proof packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rust-proof packaging bag capable of suppressing the emission of a volatile corrosion inhibitor for expressing a rust-proof function to the outside of the bag when a metal component or the like is packaged, prolonging the rust-proof function, and preventing the occurrence of defective delamination. <P>SOLUTION: The rust-proof packaging bag has a multi-layered structure formed in a bag shape in which at least an outer layer sheet having a gas barrier property and an inner layer sheet containing the volatile corrosion inhibitor are layered on each other, and their peripheral edges are made adhesive while other portions than peripheral edges are made non-adhesive. An air layer is formed in a non-adhesive portion between the outer layer sheet and the inner layer sheet. The outer layer is formed of a layered body of a base material having gas barrier properties and a thermal bonding resin film. The inner layer is formed by mixing the volatile corrosion inhibitor in the thermal bonding resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a rust-proof packaging bag for packaging metal machinery / equipment or parts, etc., and preventing the metal surface from being oxidized and rusted or damaged during storage, transportation and transportation. .

  The purpose of rust-proof packaging is to use appropriate rust-proof packaging materials for metal materials and parts, considering the material, shape, degree of surface finish, and their functions, either physically or in transportation and storage. The purpose is to prevent the deterioration and damage of the article from the environment such as temperature and humidity, exhaust gas and light. Rust-proof packaging technology developed rapidly in the United States during the Second World War, with the aim of preventing long-distance transport of weapons and munitions and rusting during storage in hot and humid areas. . In 1959 (Showa 34), JIS-Z-0303 (General Rules for Rust Prevention Packaging Method) was established with reference to MIL-P-116B (US Military Standard: Rust Prevention Packaging Method), and rust prevention management was established. Widely used.

  Vaporizable rust preventives are often used for storing, transporting, and transporting machines, instruments, precision equipment and electronic components that cannot be rusted by application of rust preventive oil. Normally, when packaging an object to be rusted, a vaporizable rust inhibitor is inserted into the inner space of the package, and the volatilizing rust preventive component is chemically or physically applied to the surface of the object to be rusted. By adsorbing, oxidation (corrosion) due to atmospheric oxygen or moisture is prevented.

  Ordinary vaporizable rust preventives volatilize at room temperature and exhibit a rust preventive effect, so simply spraying or applying powder or liquid vaporizable rust preventives directly onto the object to be rusted. The rust preventive component volatilizes within a short period of time and loses the rust preventive effect. In addition, with powder and liquid vaporizable rust preventives, it takes time to spray or apply it to the object to be protected, and it is necessary to enclose the vaporizable rust preventive in a porous sachet or the like. is there. Moreover, when these carrier components of the rust preventive component adhere to the surface of the object to be rusted, it may cause a functional failure particularly in precision instruments and the like, and the trouble of removal is very complicated.

  Therefore, for example, as disclosed in Patent Document 1 and the like, a rust preventive film obtained by applying or kneading the above vaporizable rust preventive agent to a plastic film such as polyethylene is often used. Further, not a rust preventive film alone, for example, Patent Document 2 discloses a heat-sealable transparent sheet in which a transparent film base that does not transmit a rust preventive vapor and a film that holds the rust preventive agent are bonded, Patent Document 3 discloses a rust-proof film obtained by laminating an ethylene-vinyl alcohol copolymer resin layer containing a vaporizable rust preventive agent on the surface of a polyolefin-based film. A rust-proof film in which a polyvinyl alcohol layer and a plastic thin film with a high water vapor barrier property are formed on one surface of a plastic film containing a conductive rust preventive agent is disclosed. It is used a lot.

  However, in the conventional structure in which a gas barrier film and a rust inhibitor-containing film are laminated via an adhesive, the rust inhibitor that bleeds out on the surface of the rust film causes a laminating failure and is difficult to process and is in use. There is a problem that defects such as delamination occur.

Japanese Patent Laid-Open No. 49-1644 US Pat. No. 2,829,080 Japanese Patent Publication No.52-13988 JP-A-01-297241

  The present invention was invented in order to overcome the above problems in consideration of the above circumstances, and when a metal part or the like is packaged, it suppresses the release of a vaporizable rust inhibitor that exhibits a rust prevention function, An object of the present invention is to provide a rust-proof packaging bag that extends the rust prevention function and does not cause delamination defects.

  The invention according to claim 1 of the present invention is a bag-like structure in which at least an outer layer sheet having gas barrier properties and an inner layer sheet containing a vaporizable rust preventive agent are laminated, and the peripheral portion is bonded and the other portions are not bonded. It is a rust-proof packaging bag characterized by having the multilayer structure formed in this.

  The invention according to claim 2 of the present invention is the rust-proof packaging bag according to claim 1, wherein an air layer is provided in a non-bonded portion between the outer layer sheet and the inner layer sheet.

  The invention according to claim 3 of the present invention is characterized in that the inner layer sheet containing the vaporizable rust inhibitor is obtained by kneading a vaporizable rust inhibitor into a heat-fusible resin. It is a rust-proof packaging bag to be described.

  In the invention according to claim 4 of the present invention, the outer layer sheet having gas barrier properties comprises a laminate of a gas barrier base material and a heat-fusible resin. It is a packaging bag.

  In the rust-proof packaging bag of the present invention, a heat-fusible outer layer having gas barrier properties and a heat-fusible inner layer containing a vaporizable rust preventive agent are stacked via an air layer in the middle, and the It has a double bag structure in which the peripheral edge is sealed by heat sealing. Compared to the conventional gas barrier film and rust preventive film integrated with an adhesive, the air layer in the middle of the double structure is the equilibrium zone for the vaporizable rust preventive agent, and the outer layer is the gas barrier. Therefore, the release of the vaporizable rust preventive agent to the outside of the bag can be suppressed, and the rust preventive effect can be obtained for a long time.

  In addition, the outer layer has a structure in which a heat-fusible resin is laminated on a gas-barrier base material, so that the heat-fusible property with the inner layer, which is a rust-proof film in which a vaporizable rust inhibitor is kneaded into the heat-fusible resin. Is good. Moreover, since the gas barrier base material of the outer layer is excellent in heat resistance, it is excellent in suitability for heat fusion sealing between inner layers. Furthermore, since the same resin is basically melted and integrated, the sealing portion has no fear of delamination or the like, and the sealing performance is stable. For this reason, an antirust effect can be exhibited in the long term by gradually releasing the antirust effect component into the packaging space.

It is explanatory drawing which shows one Embodiment of the antirust packaging bag of this invention in a cross section. It is a schematic diagram which shows the external appearance of one Embodiment of the antirust packaging bag of this invention with a perspective view.

  Hereinafter, the present invention will be described in detail based on an embodiment. FIG. 1 is an explanatory view showing an embodiment of the rust-proof packaging bag of the present invention in cross-section, and (a) shows a cross-section of the packaging bag when a rust-proof object such as a metal part is sealed and packaged ( (b) is an example of an outer layer, (c) is an explanatory diagram of an example of an inner layer. FIG. 2 is a schematic view showing an external appearance of the rust-proof packaging bag according to the present invention when sealed and packaged.

  In the rust-proof packaging bag 10 of the present invention, a heat-sealable outer layer 2 having gas barrier properties and a heat-sealable inner layer 3 containing a vaporizable rust preventive agent 1 are interposed via an air layer 4 in the middle. And a double bag structure in which the peripheral edge portion 5 is sealed by heat sealing. The outer layer 2 and the inner layer 3 are prepared separately. First, the three peripheral edges are heat-sealed in advance, and then the object to be rusted is inserted into the space of the inner layer from one opening, and finally the opening side The peripheral edge is heat-sealed and sealed. Here, the shape of the packaging bag is a shape in which the four sides of the rectangle are sealed, but a bag having an irregular shape such as a circle or a gusset shape can be used without departing from the spirit of the present invention. is there.

  Here, the outer layer 2 is heat-sealed as a sealant layer 23 in order to prevent the vaporizable rust inhibitor 1 contained in the inner layer from being released to the outside air side (the side opposite to the content enclosing side). A material obtained by laminating a gas barrier film as the gas barrier substrate 22 on a functional resin is used. As a laminating method, a known method such as dry laminating using the adhesive 24 or extruding and laminating a heat-fusible resin on a gas barrier film can be used. Here, as a gas barrier film, what is marketed as a transparent vapor deposition barrier film which vapor-deposited transparent thin films, such as magnesium oxide, calcium oxide, aluminum oxide, and silicon oxide, on resin films, such as PET, can be used. . Moreover, in order to suppress the release of the vaporizable rust preventive agent, a film having gas barrier properties such as EVOH (ethylene-vinyl alcohol copolymer) can be used in addition to the transparent vapor deposition barrier film described above. Since this outer layer is heat-sealed with the inner layer at the peripheral portion of the packaging bag, the heat-fusible resin as the sealant layer is preferably at least 20 μm or more, preferably 50 μm or more in terms of the resin thickness.

  Next, the inner layer 3 is a rust prevention film formed by kneading a vaporizable rust inhibitor into a heat-fusible resin. A film formed by a known method such as an inflation method, an extrusion casting method, or a calendar method can be used. The thickness of the film is not particularly limited, but in the case of a heavy material, about 80 μm to 120 μm is preferable from the viewpoint of protecting the contents.

  Examples of the heat-fusible resin used as the base of the outer layer 2 and the inner layer 3 include low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-α olefin copolymer, polypropylene, propylene-ethylene random copolymer, propylene. -Ethylene block copolymer, propylene-α olefin copolymer, ethylene-cyclic olefin copolymer, ethylene-vinyl acetate copolymer, or part or complete tendon copolymerized with cycloolefin such as cyclopentadiene or norbornene. It is possible to select from a compound, an ethylene- (meth) acrylic acid copolymer or an esterified product thereof, an ionic cross-linked product, an ethylene- (meth) acrylic acid- (meth) acrylic acid ester terpolymer, or the like. . Also, a blend of two or more of these heat-fusible resins may be used. Various additives such as an antioxidant, a flame retardant, a slip agent, an antiblocking agent, a dispersant, and a light stabilizer may be further blended with these heat-fusible resins.

The rust preventive agent kneaded into the rust preventive film of the inner layer 3 is preferably a vaporizable rust preventive agent, and the rust preventive agent is selected depending on the object to be protected such as iron use, non-ferrous use, multi-metal use. Nitrite or nitrite which exhibits good characteristics of the packaging bag having the antirust function of the present invention, has good kneading into polyolefin resin, is easily formed into a film, and has little contamination to the metal surface. It is desirable to include Specifically, NO itself has no vaporization property, but causes hydrolysis in the presence of moisture in the atmosphere and an acid component such as carbon dioxide gas, and exhibits an excellent rust prevention effect on steel materials. ₂ ^- sodium nitrite to produce a gas, potassium nitrite, nitrite such as calcium nitrite and the like. Before the metal and hydroxide ions are combined, they combine with nitrite ions in the vaporized gas to form a rust preventive film on the metal surface. In addition, diisopropylammonium nitrite (DIPAN), a sodium benzoate and nitrite, that itself has a vaporization property and dissolves in moisture adsorbed on the metal surface to form a film having anti-corrosive properties on the metal. , Dicyclohexylammonium nitrite (DICHAN), nitronaphthalene ammonium nitrite (NITAN), and mixtures thereof can also be used. Moreover, the packaging bag which has a rust prevention function of this invention can also use together benzotriazole or its derivative which has a rust prevention effect with respect to copper and copper alloys other than steel products. In addition, many of these vaporizable rust preventives are harmful to the human body, and care must be taken when handling them. The amount of volatile corrosion inhibitor includes a packaging space volume of Hibosabi products are selected by rust period, generally a concentration of 5 g / m ³ or more anticorrosive ingredients relative packaging internal space volume It is desirable to maintain it, and it is preferable to add 2 to 15% by mass of the entire anticorrosive film layer from the viewpoints of rust preventive component dispersibility, film-forming properties, and heat sealability.

  Specific examples and comparative examples of the present invention will be described below.

<Example 1>
As an outer layer, a dry-laminated laminate of 15 μm aluminum oxide vapor-deposited film (GL-AEY, manufactured by Toppan Printing Co., Ltd.) and 80 μm LDPE was prepared. As an adhesive for dry lamination, “LX703VL manufactured by DIC” was used at a coating amount of 4 g / m ² . Using the outer layer and the LDPE-based rust preventive film 80 μm kneaded with a vaporizable rust preventive agent for iron as the inner layer, seal the three sides so that an air layer remains between the outer layer and the inner layer A double-structured bag having outer dimensions of the packaging bag of length: 300 mm, width: 300 mm, and seal width: 10 mm was prepared. Put the steel material of dimensions: 150mm x 150mm x 1.5mm into the created double structure bag, heat seal the air gap so that an air layer remains between the outer layer and the inner layer, and seal the rust prevention of Example 1 A packaging bag was obtained.

<Comparative Example 1>
As the outer layer, an LDPE film of 80 μm was used, and a double structure bag was prepared in the same manner as in Example 1 to obtain a rust-proof packaging bag of Comparative Example 1.

<Comparative example 2>
Example 1 using a dry laminate of 80 μm of LDPE-based rust preventive film kneaded with a vaporizable rust preventive agent for iron and 15 μm of aluminum oxide transparent vapor-deposited film (GL-AEY, manufactured by Toppan Printing Co., Ltd.) A single-structure bag with the same dimensions as was made. As an adhesive for dry lamination, “LX703VL manufactured by DIC” was used at a coating amount of 4 g / m ² . Others were carried out similarly to Example 1, and obtained the antirust packaging bag of the comparative example 2.

<Comparative Example 3>
Size: 150 mm × 150 mm × 1.5 mm steel material was uniformly coated with rust-preventive oil for iron use, and this was used as Comparative Example 3 as Comparative Example 3.

Using the above-described packaging bags of Comparative Examples 1 and 2 and Comparative Example 3, the rust prevention effect (rusting suppression effect test) was evaluated. Each packaging bag and the comparison object have the effect of suppressing rusting by 30 cycles of temperature cycle tests, with "65 ° C 4h → 25 ° C 4h → 0 ° C 4h → 25 ° C 4h" in a 100% humidity environment. evaluated.
* The degree of rusting was 1: slightly rusted on the end face and plane of the part, 2: rusted on the part plane, and 3: increased rusting on the part plane. The results are shown in Table 1.

<Comparison result>
As shown in Table 1, it was found by comparison between Example 1 and Comparative Example 3 that the packaging bag of the present invention has rust prevention performance equivalent to that when rust prevention oil is used. Moreover, since the difference in the rusting situation is seen in the comparison between Example 1 and Comparative Example 1, the packaging bag of the present invention using the transparent vapor-deposited barrier film as the outer layer is outside the bag of the vaporizable rust preventive agent. It became clear that there was a release suppression effect. Further, in comparison between Example 1 and Comparative Example 2, the packaging bag of the present invention does not cause delamination because the rust inhibitor and the adhesive are not in direct contact with each other, so that the function of the rust inhibitor is maintained. Appearance abnormality could be suppressed. From the above results, the usefulness of the rust-proof packaging bag of the present invention became clear. In the present invention, the number of film layers to be used is increased. However, considering that it is not necessary to use rust preventive oil and that the rust preventive effect can be extended, the cost effectiveness is great.

DESCRIPTION OF SYMBOLS 1 ... Vaporizable rust preventive agent 2 ... Outer layer 3 ... Inner layer 4 ... Air layer 5 ... Peripheral part 10 ... Antirust packaging bag 22 ... Gas barrier base material 23 ...・ Outer sealant layer 24 ... Adhesive

Claims (4)

  At least, it has a multilayer structure formed by laminating an outer layer sheet having gas barrier properties and an inner layer sheet containing a vaporizable rust preventive agent, and forming a bag shape in which the peripheral portion is bonded and the other portions are not bonded. Rust-proof packaging bag.   The rust-proof packaging bag according to claim 1, wherein an air layer is provided in a non-bonded portion between the outer layer sheet and the inner layer sheet.   The rust preventive packaging bag according to claim 1, wherein the inner layer sheet containing the vaporizable rust preventive agent is obtained by kneading a vaporizable rust preventive agent with a heat-fusible resin.   The rust-proof packaging bag according to claim 1, wherein the outer layer sheet having gas barrier properties is a laminate of a gas barrier substrate and a heat-fusible resin.