JP2002347714A - Method for packaging hygroscopic film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste-free packaging method which can package and store a photosensitive resin laminated film in a dried state. SOLUTION: In this method for packaging a rolled hygroscopic film on a pipe, the rolled film is covered with a desiccant film laminated with aluminum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for packaging a hygroscopic film wound in a roll. In particular, the present invention relates to a method for packaging a hygroscopic film suitable for storing a film-like electronic material having hygroscopicity stably for a long period of time.

[0002]

2. Description of the Related Art In many cases, a hygroscopic film, for example, an electronic material formed into a film, undergoes denaturation by absorbing moisture in the environment, and the shelf life after production and packaging is often limited.
Denaturation due to moisture absorption includes deterioration of material properties and deformation of the roll shape. Above all, in a photosensitive resin laminated film called a dry film resist, the photosensitive resin layer is softened by moisture absorption, and the exudation of the resin from the end face of the moisture absorbing film wound in a roll shape is accelerated.
This seepage phenomenon is called an edge fuse.

[0003] When the exudation of the resin becomes severe, the exuded resin fuses on the end faces, and when the photosensitive resin laminated film is pulled out from the roll to be laminated on the substrate, it makes a sound or smoothly pulls out. Since the lamination is not performed, a problem such as a lamination failure and a wrinkle is generated. Further, the crushed pieces of the exuded resin layer adhere to the substrate on which the photosensitive resin laminated film is laminated, leading to various defects.

Conventionally, in order to suppress or reduce the transformation caused by moisture absorption, the photosensitive resin laminated film has conventionally been stored in a dry atmosphere or at a low relative humidity and low temperature. Due to difficulties in management, it could not be applied during transportation, and sufficient effects were not obtained. Therefore, a packaging method has been proposed in which the photosensitive resin laminated film is packaged with a material having low moisture permeability and a desiccant is placed inside the packaging bag (US Pat. No. 4,680,248). It adhered to the photosensitive resin laminated film and caused a quality problem when producing a printed wiring board. Further, after opening, it is necessary to treat the used desiccant, which is complicated in operation.

[0005] A method of packaging with a sheet sandwiching a desiccant between two types of plastic films has been proposed (Japanese Patent Publication No. 6-21938). However, the sheet is easily damaged or broken, and the inside of the sheet is easily damaged. There is a problem that foreign substances such as a desiccant and other particles and powder leak out.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a moisture-absorbing raw film such as a photosensitive resin laminated film which is kept in a dry state without any foreign matter during storage or after handling after packaging. It is to provide a packaging method suitable for long-term storage.

[0007]

Means for Solving the Problems The present inventor has conducted research to achieve the above object, and as a result, has sought to package a photosensitive resin laminated film using a desiccant film laminated with aluminum. In this way, it was found that dust was completely generated during storage and edge fuses were suppressed. That is, the present invention provides a method for packaging a hygroscopic film, comprising covering a roll-shaped hygroscopic film wound on a tube with a desiccant film laminated with aluminum, and the hygroscopic film packaged by the above method. Film. As the hygroscopic film in the present invention,
Photosensitive resin laminated films are preferred. Further, it is preferable to use a plastic film in which an anhydrous inorganic filler is kneaded as a constituent of the desiccant film laminated with aluminum.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The hygroscopic film used in the present invention is coated with an adhesive resin, a photosensitive resin or a curable resin in many cases.
Used for photographic films, video tapes, conductive films, anisotropic conductive films, dry film resists, etc. In particular, the method of the present invention is widely used in the manufacture of printed wiring boards as a dry film resist using a hygroscopic film for forming a wiring pattern of a metal-coated insulating material, and is suitable for packaging a photosensitive resin laminated film.

[0009] The degree of moisture absorption of the hygroscopic film used in the present invention cannot be specified differently because the required degree varies depending on the use of the hygroscopic film. In general, a film having a water increase rate of 0.1% or more when left at 23 ° C. and a relative humidity of 50% for 1 hour is included in the hygroscopic film of the present invention. The aluminum-laminated desiccant film is a multilayer composite film. The desiccant film is produced by kneading a thermoplastic resin such as polyethylene, polyamide, or polypropylene with an anhydrous inorganic filler. As the inorganic filler, an oxide of a metal such as silicon, aluminum, magnesium, calcium, iron, and potassium is used. These react with the moisture in the environment and absorb the moisture by converting the oxides to hydroxides. The inorganic filler is usually contained in an amount of 10 to 50% by mass based on the entire desiccant film. A film such as polyethylene may be further laminated on one or both surfaces of the desiccant film in which the inorganic filler is kneaded.

As a method of laminating aluminum on a desiccant film, an adhesive is applied to an aluminum foil and dried, followed by a dry lamination method of laminating the desiccant film, or a hot-melt adhesive is melt-coated on the aluminum foil,
There is a hot melt lamination method in which a desiccant film is attached. Further, a method of depositing aluminum on a desiccant film by vacuum deposition or sputtering is also used. The layer structure of the desiccant film laminated with aluminum is not limited, and a layer obtained by laminating ordinary plastic films in any order other than the aluminum layer and the desiccant film layer is used. As the most preferred example,
A plastic film such as polyethylene is laminated on both sides of a desiccant film mixed with an inorganic filler, aluminum is laminated on the other side, and another plastic film such as polyethylene terephthalate or nylon is used for protecting the aluminum layer on the outermost layer. Are laminated.

Specifically, from the inside, a polyethylene layer (10 μm) / desiccant film layer (50 μm) / polyethylene layer (50 μm) / aluminum layer (9 μm) / polyethylene layer (15 μm) / polyethylene terephthalate layer (12 μm) Films and the like laminated in order are mentioned. The desiccant film laminated with aluminum can suppress the edge fuse due to moisture absorption of the photosensitive resin laminated film. However, if both ends are sealed after deaeration with a vacuum heating sealer, the effect is further enhanced.

According to the present invention, a hygroscopic film, for example, a photosensitive resin laminated film, is manufactured as a laminated film element wound on a plastic tube (referred to as a core) and packaged with a desiccant film laminated with aluminum. Is done. The desiccant film laminated with aluminum is cylindrical and wider than the laminated film element to be packaged. After covering the laminated film element with this film, the remaining portions at both ends are folded into the space in the core tube to package the laminated film element. In order to shield the laminated film element from the outside air and to fix it in a suspended state in a cardboard box, a plastic supporting plate (referred to as a core holder) is inserted from both ends of the core into the cardboard. Packed in a box.

Referring to the drawings, FIG. 1 shows a package according to a conventional method, and FIG. 2 shows a package according to the method of the present invention. According to the prior art, a photosensitive resin laminated film 1 is generally manufactured, transported, and stored as a laminated film element 3 wound on a plastic tube (core) 2 called a core, as shown in FIG. The laminated film element 3 is packaged with a light-shielding black film 4 to prevent light exposure during transportation and storage. The black film 4 has a tubular shape, is wider than the laminated film element to be covered, and covers the laminated film element, and then folds the remaining portions at both ends into the inner space of the core tube to package the laminated film element. To keep the packaged laminated film element suspended in a cardboard box,
A plastic support plate (core holder) 5 is inserted from both ends of the core and packed in a cardboard box.

In the present invention, as shown in FIG. 2, a desiccant film 6 in which the surface of the photosensitive laminated film is laminated with aluminum from above the laminated film element 3 in which the photosensitive laminated film 1 is wound around the core 2. Cover and package. In order to keep the wrapped laminated film element suspended in the cardboard box, plastic support plates (core holders) 5 are inserted from both ends of the core and packed in the cardboard box. In some cases, the outermost laminated film may be blackened to prevent light exposure during transportation or storage to enhance light-shielding properties.

Hereinafter, the present invention will be described specifically with reference to examples. Various properties used in the present invention are measured by the following methods. (1) Edge fuse test A packaged laminated film element having a width of 330 mm and a diameter of 177 mm wound around a hollow core having an outer diameter of 81 mm is left for 3 months at 25 ° C. and 50% RH, and then laminated. The state of exudation of the resin from the end face of the film element is ranked according to the following criteria. A: No exudation B: Slight exudation C: Exudation is slightly blurred D: Exudation is considerable and part is shining mirror-like E: Exudation is severe and mirror-like in surface場合 indicates that the rank is A to C, and X indicates that the rank is D or E.

(2) Inspection of dust The end face of the photosensitive element used in the edge fuse test is observed with a magnifying glass to count the number of dust. The rank is classified according to the following criteria based on the total number of dust on both end faces of one photosensitive element. 1: No garbage 2: 2: 1 to 5 garbage 3: 6 or more garbage

(3) Drop tear test A core holder is inserted into both ends of a packaged laminated film element having a width of 330 mm and a diameter of 177 mm wound around a hollow core having an outer diameter of 81 mm, and two cores are inserted into one cardboard box. Insert and pack the laminated film element. After dropping the cardboard box onto the floor from a height of 2 m, the box is unpacked and the packaging bag of the laminated film element is checked for tears.場合 indicates no break, and x indicates one or more breaks.

[0018]

[Example 1] Sunfort (registered trademark) manufactured by Asahi Kasei Corporation
AQ-3092 (a width of 3 μm in a structure in which a 30 μm-thick photosensitive resin layer is sandwiched between a 30 μm-thick polyethylene film and a 20 μm-thick polyethylene terephthalate film)
A 30 mm photosensitive laminated film) is wound around a hollow core having an outer diameter of 81 mm (winding tension: 10 k).
g / m) to produce a laminated film element. This laminated film element is 191 mm in diameter and 450 in length.
Dry Keep (registered trademark, low-density polyethylene film, a 30 μm thick desiccant obtained by kneading an inorganic filler in a cylindrical, aluminum-laminated desiccant film manufactured by Sasaki Chemical Co., Ltd., having a thickness of 80 mm and a thickness of 80 μm. The both sides of the layer are covered with a low density polyethylene film having a thickness of 10 to 20 μm), the both ends of the film are folded into the voids in the core, the core holders are inserted into both ends of the core, put in a cardboard box, and subjected to an edge fuse test. Was.

As a result of storage at 25 ° C. and 50% RH for 3 months, the rank was B in the edge fuse test. In the dust inspection, the rank was 1 and the quality was good with no dust attached. In the drop tear test, the result was ○, and the desiccant film laminated with aluminum showed sufficiently high strength.

[0020]

Example 2 Using the same film as in Example 1,
After heat-sealing both ends of the aluminum-laminated desiccant film while degassing with a vacuum heating sealer, an edge fuse test was performed in the same manner as in Example 1. Dust inspection rank 1
Met.

[0021]

Comparative Example 1 An edge fuse test was performed in the same manner as in Example 1 except that a cylindrical black polyethylene film having a thickness of 80 μm and a diameter of 191 mm was used instead of the desiccant film laminated with aluminum. When I went, the rank was D. The rank by the dust inspection was 1.

[0022]

Comparative Example 2 A doughnut-shaped sheet desiccant having a thickness of 1 mm was brought into contact with both end surfaces of a laminated film element, and fitted. When the edge fuse test was performed by the method described above, the rank was B.
The dust inspection gave a rank of 3, and paper dust generated from the desiccant was observed to adhere to the laminated film element.

[0023]

Comparative Example 3 In Example 1, a composite film having a structure in which a layered silica gel having a thickness of 100 μm was sandwiched between a polyethylene film having a thickness of 10 μm and a polyethylene film having a thickness of 50 μm instead of the desiccant film laminated with aluminum. When an edge fuse test was performed using the same method as in Example 1, the rank was B. The rank by the dust inspection was 1. The rank in the drop tear test was x, and the packaging material was found to have two breaks at the portion folded into the core, and the flexibility at the time of bending was insufficient.

[0024]

According to the method of the present invention, a roll-shaped hygroscopic film wound on a tube is covered with a desiccant film laminated with aluminum, so that no dust is generated and packaging is performed in a dry state. Can be stored.

[Brief description of the drawings]

FIG. 1 is a view showing a package of a laminated film element according to a conventional method.

FIG. 2 is a diagram showing a package of a laminated film element according to the method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 photosensitive laminated film 2 core 3 laminated film element 4 black film 5 core holder 6 desiccant film laminated with aluminum

Continued on the front page F term (reference) 3E028 AB01 BB04 CA01 HA02 3E067 AA16 AB39 BA31A BB12A BB14A BB15A BB22A BB25A CA05 CA09 CA12 EA03 EE25 EE32 FA01 FB08 FC01 GA30 3E086 AB01 BA04 BA13 BA15 BA35 BA02 BA15 BA35 BA02 BA15 BA35 BB02 JD15 JN17

Claims (4)

[Claims] 1. A method for packaging a hygroscopic film, comprising covering a roll-shaped hygroscopic film wound on a tube with a desiccant film laminated with aluminum. 2. The method for packaging a hygroscopic film according to claim 1, wherein the hygroscopic film is a photosensitive resin laminated film. 3. A plastic film mixed with an anhydrous inorganic filler is used as a component of the desiccant film laminated with aluminum.
Or a method for packaging the hygroscopic film according to 2. 4. A moisture-absorbing film packaged by the method for packaging a moisture-absorbing film according to claim 1.