JPS6117015Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a package in which a nylon film wound body wound into a roll around a moisture-proof core tube is wrapped with a moisture-proof material having pinhole resistance. Generally, due to its molecular structure, nylon film has the property of absorbing moisture much more easily than polyolefin films and the like. Therefore, during storage after manufacture of the nylon film until it is used, the film absorbs moisture from the air and stretches, causing wrinkles and the like, resulting in a significant decrease in processing suitability. Furthermore, many parts became unusable during the printing and laminating processes, resulting in a high waste rate. In order to improve these shortcomings, attempts have been made in the past to create a package using, for example, a laminate of aluminum foil laminated with polyolefin film or kraft paper as a packaging material. This is because it is considered that in order to prevent moisture absorption, it is sufficient to shield the nylon film roll from outside air containing moisture. However, after the nylon film roll is packaged in moisture-proof packaging, it is further packed in a cardboard box, stored, transported by truck, etc., and then opened by the user and set in the processing machine. During this time, complex external forces such as rubbing or kneading are applied to the packaging film itself. It is a serious problem that the initial moisture barrier properties are degraded by these external forces.
In other words, packaging materials for nylon film rolls are required not only to have simple moisture-blocking properties, but also to have physical strength that does not change over time during use, such as against kneading, rubbing, and rubbing. However, in the conventionally used laminate of aluminum foil and polyolefin film, many small tears occur in the aluminum foil due to external forces such as rubbing, and the moisture barrier properties decrease, making it impossible to prevent moisture as much as the nylon film originally did. will no longer be possible. Furthermore, even if the user of the nylon film roll repacks the nylon film after processing it to prevent moisture absorption, it becomes difficult to maintain its moisture-proof function. In order to prevent these drawbacks,
Furthermore, it is necessary to laminate many layers of polyolefin film or the like on the aluminum foil, resulting in a high price and a large thickness, which is impractical. Therefore, the inventors of the present invention have a different idea from the above,
Moisture barrier properties are kept to a level that does not cause significant appearance defects due to moisture absorption of the nylon film, but on the other hand, it is difficult to prevent moisture from being degraded due to economical external forces during packaging, such as cracking, scratching, scratching, tearing and peeling due to repackaging, etc. The present invention was developed after studying a package using a packaging material that can minimize the reduction in barrier properties. That is, in the present invention, a nylon film is wound in the form of a roll around a core tube whose surface portion is wound with a plastic film having a metal vapor deposited layer formed thereon, and at least the metal vapor deposited side of the plastic film is coated with polyolefin. This is a nylon film packaging body in which the above-mentioned nylon film roll body is wrapped with a laminated film coated with a laminated film. To explain the present invention specifically, the plastic film for metal vapor deposition has a thickness of about 5μ to 100μ, preferably 10μ to 40μ, and is usually a uniaxially or biaxially stretched film of polypropylene, polyester, nylon, etc. Therefore, in order to improve the adhesion strength between the metal vapor deposited film and the base film, it is desirable to perform a corona discharge treatment on the surface on which the metal vapor deposited layer is to be formed in advance, and the effect is particularly great in the case of polyolefin film. Further, more desirable adhesion can be obtained by coating with a primer before metal deposition. A metal vapor deposition film is formed on the plastic film by a conventional method. The thickness of metal vapor deposition film is 40m
μ or more, preferably about 40 mμ to 400 mμ. The metal for vapor deposition is usually aluminum or zinc, but of course other metals that can be vapor deposited may be used. An unstretched polyolefin film layer is formed on the metal vapor deposited layer by dry laminating a polyolefin film or by extrusion laminating a molten polyolefin resin. In this case as well, it is preferable to coat with an undercoat in order to increase the adhesive strength between the metal vapor deposited film and the polyolefin film layer. The polyolefin forming the polyolefin film may be a so-called polyolefin polymer such as polyethylene, polypropylene, polybutene, ethylene copolymer, propylene copolymer, or the like. The polyolefin film layer may be formed on either one or both sides of the plastic film, but it is necessary to form the polyolefin film layer on the metal vapor-deposited surface. Each laminate strength (between stretched plastic film and polyolefin film) is 100
It is preferable that it is more than g/15mm. If the laminate strength is low, peeling may occur due to external forces such as rubbing or rubbing, resulting in increased moisture permeability. The moisture permeability of the laminate film used as the packaging material for the package of this invention is normally 1.5g/ ^m2・24hr (JIS-Z
−0208) or less. In addition, the core paper tube of the nylon film winding body has 1 to 2 layers of plastic film, preferably a stretched plastic film on which a metal vapor deposited layer is formed (each thickness is the same as described above for the packaging material) on its surface. By using a wound material, excellent moisture resistance can be exhibited. The plastic film with a metal vapor-deposited layer formed thereon for winding around the surface of the core paper tube may be further laminated with a paper-plastic film, etc., without departing from the purpose of the present invention. The packaging material used for the nylon film package of the present invention has moisture barrier properties that do not cause significant appearance defects due to moisture absorption of the nylon film. On the other hand, as a package for a nylon film roll, it is an excellent product that minimizes the loss of performance due to economical external forces, such as tearing and peeling due to kneading, rubbing, rubbing, repackaging, etc. The packaging material of the present invention has the above-mentioned excellent properties.
Examples of the packaging body of the present invention are shown in FIGS. 1 and 2 (both longitudinal sectional views), but the present invention is not limited thereto. In FIGS. 1 and 2, 1 is a nylon film roll, 2 is a paper tube, 3 is a metal-deposited film,
4 is a laminate film, and 5 is a paper tube collar. EXAMPLE A biaxially oriented polypropylene film having a thickness of 25 μm, which had been subjected to corona discharge treatment on one side, was coated with a primer, and aluminum was also vacuum-deposited to a thickness of about 60 μm. Further, a primer was applied to the metal-deposited surface, and polyethylene was melt-extruded and laminated thereon to a thickness of 30 μm. The moisture permeability of the obtained laminate is 0.9
g/m ²・24hr. This packaging material is a biaxially stretched nylon film wound into a roll (the surface of the core paper tube of the roll is 60 m
A 25μ biaxially oriented polypropylene film with an aluminum deposited layer of μm was wrapped in one layer) and sealed (shape, Figure 1). For comparison, 7μ thick aluminum foil and 25
A nylon film roll-up body similar to the above example was sealed and packaged using a laminate obtained by dry laminating a biaxially stretched polypropylene film having a thickness of μ. When both were left indoors for two months and then opened, there was no significant difference in the appearance of the film rolls. Meanwhile, both packages were packed in cardboard boxes and transported by truck to a customer approximately 100 km away, and then opened and processed into nylon films. After each unsealed packaging material was collected, the newly manufactured nylon film roll was rewrapped and left for two months. As a result, the nylon film roll wrapped with the packaging material of the present invention did not wrinkle due to moisture absorption. The outbreak is

[Table] Comparing both packaging materials after reuse, the aluminum foil of the comparison product was found to be torn and peeled off at the bent parts such as the core tube and cap insertion part, whereas the packaging material of the present invention No such phenomenon was observed at all.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are both longitudinal sectional views of an example of the package of the present invention. 1...Nylon film winding body, 2...Paper tube,
3...Metal vapor deposited film, 4...Laminated film,
5...Paper tube color.

Claims (1)

[Claims for Utility Model Registration] 1. At least the metal-deposited side of a plastic film in which a nylon film is wound in a roll around a core tube whose surface portion is wound with a plastic film with a metal-deposited layer formed thereon, and a metal-deposited plastic film is coated with a metal-deposited film. A nylon film package, characterized in that the above-mentioned nylon film roll is wrapped with a laminated film coated with a polyolefin film. 2. A nylon film package according to claim 1 of the utility model registration claim, characterized in that the film in which a metal vapor deposited layer is formed on a plastic film is a film in which a metal vapor deposited layer is formed on a stretched plastic film. 3. A plastic film package according to claim 1 of the utility model registration claim, characterized in that the plastic film coated with a metal vapor is a stretched plastic film coated with a metal vapor.