JPH10157791A - Cover tape for packaging chip-type electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent conventional sealing characteristics from degrading and also easily confirm contents by coloring a cover tape which can be heat-sealed on a plastic carrier tape continuously formed with housing pockets for receiving a chip-type electronic component. SOLUTION: The cover tape 1 comprises an outer layer 2 made of a biaxially oriented film which is either polyester, polypropylene or nylon, an intermediate layer 3 made of a polyethylene film and a heat-seal layer 4 made of thermoplastic resin. Which layer of the cover tape 1 to be colored and its color is not especially limited, wherein any color can be used. However, a color other than that of the carrier tape is desirable, while a color other than black is more desirable. Although transmissivity of visible light may not be improved due to addition of pigment or the like, since the color of the carrier tape is often black, contents looks more clear due to complementary color effects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package having a function of protecting a chip-type electronic component from contamination, and aligning and removing the chip-type electronic component for mounting on an electronic circuit board when storing, transporting and mounting the chip-type electronic component. The present invention relates to a cover tape which can be heat-sealed to a plastic carrier tape having a storage pocket.

[0002]

2. Description of the Related Art In recent years, chip-type electronic parts for surface mounting, such as ICs, transistors, diodes, capacitors, piezoelectric element registers, etc., have a series of embossed pockets that can be accommodated according to the shape of the electronic parts. It is supplied by being packaged in a package formed of a plastic carrier tape formed in a special manner and a cover tape heat sealable to the carrier tape. After peeling off the cover tape of the package, the electronic components of the contents are automatically taken out and surface-mounted on the electronic circuit board. After heat sealing the cover tape with the carrier tape, it is now mainly done by the naked eye to check whether the contents are neatly contained. However, since the most important property of the cover tape is the sealing property (peeling property), which is the process of peeling the cover tape from the carrier tape, various prescriptions are applied to the adhesive layer, and often the cover tape itself is transparent. This makes it difficult to identify the contents.

[0003]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide a cover tape which can easily confirm the contents without deteriorating the conventional sealing characteristics. is there.

[0004]

SUMMARY OF THE INVENTION The present invention is a cover tape which can be heat-sealed to a plastic carrier tape in which storage pockets for storing chip-type electronic components are continuously formed, wherein the cover tape is colored. It is a chip type electronic component packaging cover tape, a more preferred embodiment,
The cover tape includes at least an outer layer, an intermediate layer, and a heat seal layer, at least one of the layers is colored, and the outer layer is a biaxially stretched film of any of polyester, polypropylene, and nylon. The film and the heat seal layer are made of thermoplastic resin, and the thermoplastic resin of the heat seal layer is made of polyethylene resin, polyurethane resin, acrylic resin, polyvinyl chloride resin, ethylene vinyl acetate resin, polyester resin, ionomer resin Resin, polystyrene-based resin, polypropylene-based resin or a combination thereof, and the visible light transmittance of the cover tape is 75%
The above is a cover tape for packaging chip-type electronic components.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The components of the cover tape 1 of the present invention will be described with reference to FIG. 1. The outer layer 2 is made of a biaxially oriented polyester film, a biaxially oriented polypropylene film, or a biaxially oriented nylon film. And
It is a transparent and highly rigid film having a thickness of 6 to 100 μm. The intermediate layer 3 is made of polyethylene to improve lamination strength when the heat seal layer is extrusion-laminated, and the heat seal layer 4 is a thermoplastic resin having transparency, such as polyurethane resin, acrylic resin, ethylene vinyl acetate. Resin, polyvinyl chloride resin, polyester resin, ionomer resin, polystyrene resin, and polypropylene resin, each of which has a characteristic that can be heat-sealed to the plastic carrier tape 6 of the mating material by itself or a combination thereof. Things are selected.

As for the method of forming the heat seal type adhesive, the extrusion laminating method is inexpensive and desirable from the viewpoint of hygiene. The thickness of the heat seal layer is preferably from 10 to 80 μm, more preferably from 20 to 50 μm. Film thickness is 10
If it is less than μm, it is difficult to form a film due to the characteristics of a laminating machine, and if it exceeds 80 μm, it is difficult to handle the film for storage and the like. In addition, for the purpose of improving the laminate strength between the outer layer and the intermediate layer, a thermosetting type such as an isocyanate type or an imine type,
Both may be laminated via a thermoplastic adhesive layer.

For coloring the cover tape, it is sufficient to add a pigment, a dye or the like to any of the layers constituting the cover tape in terms of cost and the like, and the layer to be added is not particularly limited. The color tone of pigments, dyes and the like is not particularly limited, and any color can be used, but a color other than the color colored on the carrier tape is preferable, and a color other than black is more preferable. Also, several kinds of pigments and dyes may be mixed. Visible light transmittance is not improved by adding pigments, etc.
Since the color of the carrier tape is mostly black, the contents can be seen more clearly due to the complementary color action. The amount of the pigment or the like may be appropriately determined depending on the type of the color, the type of the resin to be colored, the visible light transmittance, and the like.

In the method of coloring each layer, various pigments and the like and a corresponding thermoplastic resin are mixed in advance at the stage of plastic pellets as a raw material of the film, and a film is formed using the mixture. The raw material used for the heat seal layer is generally mixed with various thermoplastic resins in order to obtain effective sealing properties,
At that time, it is rational and preferable to mix a pigment or the like.

Since the visible light transmittance of the cover tape is set to 75% or more, the internal electronic components enclosed in the carrier tape or the characters written on the electronic components can be visually or mechanically sharpened. Can be confirmed. If it is lower than 75%, the internal electronic components can be confirmed, but it is difficult to discriminate characters and the like written on the electronic components.

[0010]

EXAMPLES Examples of the present invention are shown below, but the present invention is not limited by these examples. << Examples 1 and 2 and Comparative Examples 1 and 2 >> Heat in which pigment was added at the ratio shown in Table 1 to the polyethylene film surface of a laminate of a biaxially stretched polyester film (thickness: 20 μm) and a polyethylene film (thickness: 25 μm) The sealing layer was formed into a film thickness of 15 μm by an extrusion laminator.
Was obtained. After slitting the obtained cover tape to 13.5 mm width, electronic components were inserted
Heat sealing was performed with a 16.0 mm wide PVC carrier tape (black), and the characters written on the contents were visually checked. Further, the visible light transmittance of each of the prototype cover tapes was measured, and the results of evaluation of the characteristics of the examples and comparative examples are shown in Table 1. The measurement of visible light transmittance is based on JIS
K 7105.

Example 3 The same construction as in Example 1 except that 0.4 parts by weight of a pigment was added to 100 parts by weight of the polyester resin in the biaxially oriented polyester film of the outer layer instead of the heat seal layer. (Pigment: Brastron BLUE TS-3366: manufactured by Dainippon Ink and Chemicals, Inc.). The same evaluation as in Example 1 was performed using the obtained cover tape. Example 4 A cover tape having the same structure as in Example 1 was prepared except that 0.3 parts by weight of molybdenum red pigment was added instead of the pigment of Example 1. The same evaluation as in Example 1 was performed using the obtained cover tape.

Example 5 Instead of the pigment of Example 1,
A cover tape having the same configuration as in Example 1 was prepared except that 0.25 parts by weight of an organic pigment of phthalocyanine blue was added. The same evaluation as in Example 1 was performed using the obtained cover tape. Example 6 Example 1 was repeated except that 0.4 parts by weight of a cationic dye methylene blue was added to 100 parts by weight of a polyethylene resin to a polyethylene film of an intermediate layer.
A cover tape having the same configuration as that of was prepared. The same evaluation as in Example 1 was performed using the obtained cover tape.

[0013]

[Table 1]

[0014]

[Table 2]

The resins used are as follows. -PE: Sumikasen G801 (Sumitomo Chemical Co., Ltd.)-PS: Sumibright M121 (Sumitomo Chemical Co., Ltd.)-PP: Noblen FW363 (Sumitomo Chemical Co., Ltd.)

[0016]

According to the present invention, the contents can be easily confirmed without impairing the sealing characteristics of the current product and without changing the characteristic values relating to transparency such as light transmittance and haze. become.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a layer structure of a cover tape of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the cover tape of the present invention is adhered to a carrier tape and used.

[Explanation of symbols]

 1: Cover tape 2: Biaxially stretched film 3: Intermediate layer 4: Adhesive layer 5: Heat-sealed portion 6: Carrier tape

Claims (5)

[Claims] 1. A cover tape which can be heat-sealed to a plastic carrier tape in which storage pockets for storing chip-type electronic components are continuously formed, wherein the cover tape is colored. Cover tape for parts packaging. 2. The chip type electronic component packaging cover according to claim 1, wherein said cover tape comprises at least an outer layer, an intermediate layer, and a heat seal layer, and at least one of the layers is colored. tape. 3. The method according to claim 1, wherein the outer layer is a biaxially stretched film made of any one of polyester, polypropylene and nylon, the intermediate layer is a polyethylene film, and the heat seal layer is a thermoplastic resin. A cover tape for packaging chip-type electronic components according to the above. 4. The thermoplastic resin of the heat seal layer is made of polyethylene resin, polyurethane resin, acrylic resin, polyvinyl chloride resin, ethylene vinyl acetate resin, polyester resin, ionomer resin, polystyrene resin, 4. The cover tape for packaging chip-type electronic components according to claim 1, wherein the cover tape is made of any one of polypropylene resins or a combination thereof. 5. The visible light transmittance of the cover tape is 75%.
5. The method according to claim 1, wherein:
A cover tape for packaging chip-type electronic components according to the above.