JPH05212979A - Magnetic film transfer sheet - Google Patents

Abstract

PURPOSE:To obtain a magnetic film transfer sheet which is excellent in uniformity on thinness and thickness, in handling property and easy to obtain a large sized material by a method wherein a magnetic thin film is freely transferably formed onto an easily peelable sheet. CONSTITUTION:A magnetic thin film 2 is freely transferably formed onto an easily peelable sheet 1. An adhesion layer is provided on the magnetic thin film layer 2 according to necessity. Consequently a magnetic film which is excellent in uniformity in thinness and thickness, excellent in a handling property, and easy to obtain a large sized material can be obtained. Further, the magnetic thin film composed of various magnetic materials can be easily obtained, and the magnetic film can be given by a simple transfer system which is excellent in operation property. Then, its handling property is excellent, and a cutting property for a transfer part and nontransfer part is excellent. Therefore, a highly precise magnetic film pattern to a curved surface or the like can be effectively formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of transferring a magnetic thin film having excellent thinness and is capable of forming a highly accurate transfer pattern with excellent cutting properties of a transfer portion and a non-transfer portion, for forming a bar code, etc. And a magnetic film transfer sheet suitable for.

[0002]

2. Description of the Related Art Conventionally, as a magnetic film, an amorphous ribbon formed by rapidly melting a molten magnetic material on a rotating roll has been known. However, it is difficult to stably form a magnetic film having a thickness of 100 μm or less, and it has not been possible to obtain a film having a practical size and excellent film thickness uniformity. It was also difficult to obtain a large format.
Further, there is a problem in that the handleability is poor when the magnetic film is used for forming a barcode or the like. In addition, there is a problem that the material is limited to those which are amorphous and exhibit magnetism.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to develop a magnetic film which is excellent in thinness and thickness uniformity, is easy to handle, and is easily available in large size.

[0004]

The present invention provides a magnetic film transfer sheet comprising a magnetic thin film transferably formed on an easily peelable sheet.

[0005]

[Function] A magnetic thin film having excellent thinness and thickness uniformity can be easily formed on an easily peelable sheet by using various magnetic materials by a vapor deposition method or the like, and a thin film having a thickness of 100 μm or less is also easy. Can be formed. Also, it is easy to form a large size body. On the other hand, by using a transfer sheet having a magnetic film that can be transferred, the magnetic film can be applied by a transfer method that is simple and has excellent workability, and is easy to handle. Further, since it is a thin film or the like, a highly precise transfer pattern can be formed with excellent cutting properties of the transfer portion and the non-transfer portion.

[0006]

EXAMPLES The magnetic film transfer sheet of the present invention comprises a magnetic thin film that can be transferred onto an easily peelable sheet, and has an adhesive layer on the magnetic thin film if necessary. The magnetic film transfer sheet according to FIGS. 1 and 2 is illustrated. Reference numeral 1 is an easily peelable sheet, 2 is a magnetic thin film, and 3 is an adhesive layer.

As the easily peelable sheet, for example, an appropriate one known as a separator in an adhesive sheet or the like can be used. Generally, from a fluororesin such as polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene / hexafluoropropylene copolymer, chlorotrifluoroethylene / vinylidene fluoride copolymer. Sheet, a sheet made of a polyolefin resin such as polyethylene or polypropylene, or a sheet made of a usual plastic such as polyester, polyamide, polyvinyl chloride or polystyrene, or a thin foil such as a metal foil, for example, a silicone release agent or a fluorine-based release agent. A release agent, a long-chain acrylic release agent, or a material surface-treated with a release property imparting agent such as molybdenum sulfide is used.
The thickness of the easily peelable sheet may be appropriately determined, but is generally 1 to 600 μm in view of transferability of the magnetic thin film. The easily peelable sheet may have a deformability such as elongation controlled by a stretching treatment or the like.

The transferable magnetic thin film provided on the easily peelable sheet may be formed of an appropriate magnetic material according to the purpose of use. Examples thereof include amorphous magnetic alloys made of Fe, Ni, Co, etc. to which semi-metals such as B, P, Si are added, Fe-based, Fe-Si-based, Fe-Al-based, Fe-Si-Al.
Examples thereof include magnetic metals and alloys such as Fe-Cr type, Fe-Cr type, Fe-Co type, Ni-Fe type, and Ni-Mn type, and the magnetic material used is not particularly limited. The magnetic thin film can be formed by a thin film forming method such as a vacuum vapor deposition method, a sputtering method or an ion plating method. The thickness of the magnetic thin film to be formed is usually 10 to 15 from the viewpoint of transferability and thin film property.
0 μm, especially 300 Å-100 μm. The magnetic thin film may be formed as a superposed film of different materials for the purpose of adjusting the magnetic force.

The adhesive layer, which is provided on the magnetic thin film as necessary, forms a separate adhesive layer by simultaneously providing the adhesive layer at the time of transfer when the transfer adhesion of the magnetic thin film to the transferred object is insufficient. The purpose is to eliminate the process.

Any appropriate material may be used as the material for forming the adhesive layer. Examples thereof include various pressure-sensitive adhesives such as rubber and acrylic, polyalkylenes such as polyethylene and polypropylene, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate copolymer, ethylene / acrylic acid copolymer. Examples of the heat-sensitive adhesive include polyvinyl acetate, acrylic polymers, polyamides, polyurethanes, polyesters, polyvinyl ethers, polyvinyl alcohols, and mixtures thereof.

The adhesive layer may be formed by an appropriate method such as an extrusion film forming method on a magnetic thin film, a liquid material coating method, a film laminating method, or the like. The thickness of the adhesive layer is preferably 500 μm or less, more preferably 1 to 50 μm in view of transferability, but not limited to this. The transfer sheet provided with the heat-sensitive adhesive layer on the magnetic thin film can be advantageously used as a form such as a long roll which can be continuously supplied.

On the other hand, for forming the adhesive layer, for example, a low melting point metal such as indium, tin, zinc, lead, bismuth, or an alloy containing these metals can be used. The metal-based adhesive layer is formed by, for example, vacuum deposition method, sputtering method,
It can be performed by a thin film forming method such as an ion plating method or a wet plating method such as electrolytic or electroless. The thickness of the metal-based adhesive layer to be formed is usually 0.1 to 300 μm, and especially 1 to 100 μm in view of transferability and adhesiveness. The metal-based adhesive layer may be formed as a superposed layer of different metals for the purpose of improving transferability and adhesiveness.

From the standpoint of transferability, the transfer sheet is preferably one in which the interfacial adhesion of the film to be transferred to the easily peelable sheet is greater than the tensile strength of the film to be transferred, especially 1
It is larger than 0 g, especially larger than 50 g. As a result, the force required to peel the film to be transferred from the easily peelable sheet becomes larger than the film strength of the film to be transferred, and the film to be transferred can be cut by the pressing force at the time of the transfer. ..

The transfer processing of the magnetic thin film or the like is carried out, for example, by arranging a transfer sheet on an object to be transferred and punching and transferring it from the back surface of the easily peelable sheet through a pressing means such as a punching pin.
Any suitable method may be used, such as a method in which the transfer target and the magnetic thin film side of the transfer sheet are overlapped and separated from each other after being pressed by a pressing roll or a pressing device from the back surface of the transfer target or the easily peelable sheet, and various conventional The transfer method of can be applied.
The pressing force required for transfer is not limited, but is usually 3
0kg / cm ² or less, and especially 0.5~10kg / cm ² about.
For the pressing process, for example, an appropriate method such as a heating pressing method for activating the adhesive layer or the like, a vibration pressing method using ultrasonic waves, or a combination method thereof can be adopted.

In the present invention, the magnetic thin film or the like is excellent in the cutting property at the interface between the transfer portion and the non-transfer portion,
Even if the diameter or one side has a size of about 50 μm, transfer can be easily performed. Therefore, a fine transfer layer can be formed accurately. Of course, it is easier to transfer in a band shape or in a size in which the diameter or one side is 10 mm or more.

If the transfer sheet does not have an adhesive layer on the magnetic thin film and sufficient transfer adhesion is not exhibited, an adhesive layer is provided between the transfer target and the magnetic thin film. The adhesive layer may be interposed by an appropriate method such as a method in which one or both of the transferred material and the magnetic thin film is provided, or a method in which an adhesive sheet or the like is interposed. The material to be transferred may be metal, ceramic, plastic, wood, paper, or the like, and the shape thereof may be plate, curved body, fiber, or the like.

The magnetic film transfer sheet of the present invention can be used for various purposes, but is particularly advantageous for forming a fine pattern such as a magnetic reading bar code because it can form a highly accurate transfer pattern. Can be used for.

Example 1 Permalloy was vacuum-deposited (1/10 ⁴ Torr) on one surface of a polytetrafluoroethylene film having a thickness of 50 μm.
Then, a magnetic film having a thickness of 5 μm was formed to obtain a magnetic film transfer sheet.

Example 2 According to Example 1, a magnetic film transfer sheet having an amorphous magnetic film was obtained by using a Fe / Co / Si / B type magnetic alloy.

Comparative Example A 130 μm thick amorphous ribbon made of the same material as in Example 2 was used.

Evaluation Test Transferability The magnetic film transfer sheet obtained in the example was passed through the magnetic thin film side,
Place it on a glass plate with a heat-sensitive adhesive layer on the surface, write predetermined characters or straight lines on the easily peelable sheet with a 0.2 mm thick heating pen, and then peel off the magnetic film transfer sheet to confirm its transferability. It was examined and evaluated according to the following criteria. Further, the same test was performed using the amorphous ribbon of the comparative example, and the same evaluation was performed. ◯: When there is no character transferred to the glass plate or a portion where the straight line is lacking and the width of the straight line is uniform, and peeling such as creaking is not observed in the magnetic thin film (amorphous ribbon) remaining on the magnetic film transfer sheet. ×: Characters or straight lines transferred on the glass plate were chipped, the width of the straight lines was not uniform, or peeling such as mess was observed on the magnetic thin film (amorphous ribbon) remaining on the magnetic film transfer sheet. If.

The above results are shown in Table 1.

[Table 1]

[0023]

According to the magnetic film transfer sheet of the present invention, it is possible to easily obtain a magnetic thin film made of various magnetic materials and which is excellent in thinness and thickness uniformity, and to easily obtain a large-sized sheet. it can. Also, a magnetic film can be applied by a transfer method that is simple and has excellent workability, and has excellent handleability. It also has excellent cutting properties between the transfer area and the non-transfer area. Can be formed.

[Brief description of drawings]

FIG. 1 is a sectional view of an example.

FIG. 2 is a sectional view of another embodiment.

[Explanation of symbols] 1: Easy peeling sheet 2: Magnetic thin film 3: Adhesive layer

Claims (2)

[Claims] 1. A magnetic film transfer sheet comprising a magnetic thin film transferably formed on an easily peelable sheet. 2. The magnetic film transfer sheet according to claim 1, further comprising an adhesive layer on the magnetic thin film.