JP2002316396A - Multi-layered sheet and moldings using the multi-layered sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that wear dust is generated by a wear in the resin of a packaging material through rubbing of an electronic part with the inner face of the packaging material due to vibration or impact generated during conveyance, when the electronic part is packed using a ray and a carrier tape and provide a packaging container for an electronic part as a product to deal with this problem. SOLUTION: The multi-layered sheet has a base material layer composed of a thermoplastic resin and a face layer composed of a thermoplastic polyurethane resin formed on at least one of the sides of the sheet. The thickness of the face layer is invariably 1 μm or above and the total thickness of the face layer is equivalent to 50% or below of the overall thickness of the multi- layered sheet. Also the packaging container for an electronic part is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer sheet, particularly to a multilayer sheet having excellent surface abrasion resistance, and a molded article using the same.

[0002]

2. Description of the Related Art Polyvinyl chloride (PVC) is used as a material for electronic component packaging containers, for example, trays and carrier tapes.
Resins, polyethylene terephthalate (PET) resins, styrene-based copolymer resins, polycarbonate-based resins, and the like are used according to their characteristics.

[0003]

However, when electronic components are wrapped in trays or carrier tapes, the electronic components rub against the inner surface of the packaging material due to vibrations and shocks generated during transportation or the like, thereby causing the resin of the packaging material to wear. This may cause a problem such as generation of abrasion powder.
The present invention provides an electronic component packaging container that addresses such a problem.

[0004]

That is, the present invention has a base layer made of a thermoplastic resin and a surface layer made of a thermoplastic polyurethane resin on at least one surface, and the thickness of each of the surface layers is 1 μm or more. A multilayer sheet, wherein the total is 50% or less of the total thickness of the multilayer sheet, and an electronic component packaging container using the multilayer sheet.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The multilayer sheet of the present invention has a base material layer made of a thermoplastic resin and a surface layer made of a thermoplastic polyurethane resin on at least one surface.

[0006] The base layer is made of a thermoplastic resin. The thermoplastic resin is not particularly limited as long as it can be processed into a sheet by heating and melting with an extruder or the like. Polyolefin-based resin, polycarbonate-based resin, acrylonitrile-butadiene-based on a polymer, a homopolymer of ethylene and propylene, a copolymer mainly composed of ethylene or propylene, etc.
ABS resin mainly composed of a copolymer mainly composed of three components of styrene, acrylic resin mainly composed of polyacrylate such as polyacrylic acid and polymethyl methacrylate, polyamide resin, polyester resin, polyurethane Resin and these alloy resins can be used. Those obtained by adding a hydrogenated product of a styrene-butadiene copolymer, an ethylene-vinyl acetate copolymer, an ethylene-ethyl acrylate copolymer, and the like to the main components of these resins can be used. The base layer is preferably a single layer having a uniform composition, but may be composed of a plurality of components having different compositions. Additives, fillers, conductive substances, and the like can be further added to the base layer.

The surface layer is made of a thermoplastic polyurethane resin. The thermoplastic polyurethane resin used in the present invention is not particularly limited. For example, polycaprolactone-based polyurethane, polycarbonate-based polyurethane, polyether-based polyurethane, polyester-based polyurethane, and the like can be mentioned, and one or more of these are used. These thermoplastic polyurethane elastomers are commercially available (for example, Pandex (manufactured by Dainippon Ink and Chemicals, Inc.), milactran (manufactured by Nippon Milactran), Takelac (manufactured by Takeda Pharmaceutical Co., Ltd.),
All are trade names. ) Can be used.

The method for producing the multilayer sheet is not particularly limited. For example, the multilayer sheet can be produced by coextrusion molding using a feed block method or a multi-manifold method with a T-die method using a plurality of extruders. In this case, an adhesive resin may be interposed between the respective layers in order to have an adhesive strength between the base material layer and the surface layer. The surface layer can be formed on the surface of the base material layer by printing or coating. Also in this case, a layer made of another resin component can be provided by a similar method in order to provide an adhesive strength between the base material layer and the surface layer.

The thickness of each of the surface layers is 1 μm or more, and the total thereof is 50% or less of the total thickness of the multilayer sheet.
When there is no single surface layer, the thickness is 1 μm or more and 50% or less of the total thickness of the multilayer sheet. 2 surface layers
When there are layers, the thickness of each surface layer is 1 μm or more, and the total thickness of the two surface layers is 50% or less of the total thickness of the multilayer sheet. In this case, the thickness of both surface layers is preferably the same, but may be different. 1 μm
If less than 50%, the thickness of the surface layer is not sufficient, resulting in insufficient wear resistance, and if more than 50%, the secondary workability is reduced, which is not economically preferable. The total thickness of the multilayer sheet is preferably 0.1 mm to 3 mm, more preferably 0.2 mm
~ 1.0 mm is preferred.

In the multilayer sheet, various additives may be added to the base material layer and the surface layer, if necessary. Additives include colorants, pigments, dyes, antistatic agents, ultraviolet absorbers,
There are energy quenchers, light diffusers, optical brighteners, antioxidants, heat stabilizers, slip agents, antiblocking agents, fillers, matting agents, flame retardants, and the like. If the amount is small, a known resin can be added to the surface layer.

The surface of the multilayer sheet may be subjected to an antistatic treatment. Examples of the method of the antistatic treatment include a method of applying an antistatic agent, a method of laminating a resin into which a conductive substance such as an antistatic agent, carbon black, conductive inorganic fine particles, and conductive polymer fine particles is kneaded. Various known methods can be used. By performing the antistatic treatment on the surface, an effect of preventing destruction, sticking, or popping out of fine electronic components due to static electricity when used as a packaging container can be obtained.

A container having a free shape can be obtained from the above-mentioned sheet by using a known sheet forming method such as vacuum forming, pressure forming and press forming. This container can be suitably used as an electronic component packaging container. The electronic component packaging container includes, for example, a tray and a carrier tape, and is particularly suitable for packaging fine components.

[0013]

EXAMPLES Examples and comparative examples are shown below. (Evaluation method) (1) Abrasion resistance The sheet surface was scratched with nails to evaluate the degree of scratch generation. (2) Secondary workability The sheet is processed with a carrier tape molding machine (manufactured by EDG).
A 4 mm wide carrier tape was prepared and its moldability was evaluated.

(Example) ABS resin (SE-10, manufactured by Denki Kagaku Kogyo Co., Ltd.) was used as a base material, and thermoplastic polyurethane (PAN, manufactured by Dainippon Ink and Chemicals Co., Ltd.) was used as a base layer material. Using a 40 mm single-screw extruder and a 65 mm single-screw extruder to simultaneously extrude the raw materials for the double-sided layers at an extrusion temperature of 260 ° C. to 300 ° C. 700 at the feed block (thickness slit ratio 1: 10: 1)
Extruded from T-die with width of 0.5 mm, thickness of 0.50 with quenching roll
mm, thickness composition ratio of sheet 1 (surface layer): 9 (base layer): 1 (surface layer) to prepare a three-layer sheet. This sheet had excellent abrasion resistance and good secondary workability.

(Comparative Example) ABS resin was extruded from both of the two extruders of the example to form a single-layer sheet having a thickness of 0.5 mm. And it evaluated similarly. The ABS resin single-layer sheet has good secondary workability, but has poor abrasion resistance.

[0016]

The container made of a thermoplastic resin for the base material layer and made of a thermoplastic urethane resin for the surface layer has excellent abrasion resistance and can be suitably used for trays and carrier tapes.

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Claims (6)

[Claims] 1. A multi-layer sheet comprising: a base layer made of a thermoplastic resin; and a surface layer made of a thermoplastic polyurethane resin on at least one surface. A multilayer sheet having a thickness of 50% or less. 2. The multilayer sheet according to claim 1, which has been subjected to an antistatic treatment. 3. A molded article comprising the multilayer sheet according to claim 1. 4. An electronic component packaging container comprising the molded product according to claim 3. 5. The electronic component packaging container according to claim 4, which is a carrier tape. 6. The electronic component packaging container according to claim 4, which is a tray.