JPH05261823A - Shell casing - Google Patents

Abstract

PURPOSE:To provide a shell casing having strength and incombustibility, both of which depend on a metal, and functionality and lightweight, both of which depend on characteristics of a resin, in combination by a method wherein metal shell and inner mechanism part made of thermoplastic resin are strongly bonded together. CONSTITUTION:Onto the inner peripheral surface of a shell formed body 1, which is produced by forming a metal plate made of aluminum or the like into a specified shell shape, EVA, which is excellent in adhesion to the metal constituting the shell formed body, or adherent synthetic resin layer 5 consisting of three layers or lower layer 2 made of EVA, upper layer 3 made of thermoplastic resin such as polyethylene, polypropylene or the like excellent in adhesion to the thermoplastic resin, of which an inner mechanism part is made, and intermediate adhesive bond 4 excellent in adhesion to the resins of both the layers is laminated. On the above-mentioned adherent synthetic resin layer 5, the inner mechanism part 6 made of thermoplastic resin such as polyethylene, polypropylene, polyamide or the like is integrally formed by injection molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin and lightweight outer shell housing.

[0002]

2. Description of the Related Art Conventionally, as an outer shell casing for electronic devices, automobiles, etc., a metal plate formed by press working or the like and assembled by means such as welding or bolting has been used. However, in recent years, thin, lightweight, and complex-shaped casings have been demanded in accordance with the sophistication of functions, and accordingly,
The outer shell housing is being manufactured by injection molding of a thermoplastic resin.

[0003]

However, in the case of manufacturing a housing by injection molding of such a thermoplastic resin, not only is there a limit to thinning and weight reduction in terms of strength, etc., but also a large housing. In the case of manufacturing, there is a problem that an injection molding machine having a large mold clamping pressure that can withstand the injection pressure at the time of molding is required, and the manufacturing apparatus becomes large-scale.

Further, when the outer shell case is entirely made of a thermoplastic resin, it is necessary to carry out a flame-retardant treatment, but a large amount of a halogen-based flame retardant must be added to it. There was a risk of adversely affecting the environment. further,
Since it is difficult to recycle the resin, it was not preferable in terms of effective use of resources.

The present invention has been made to solve these problems. The metal outer shell and the internal mechanical portion made of a thermoplastic resin are firmly bonded to each other, and the strength and noncombustibility of metal and the function of resin are possessed. It is an object of the present invention to provide an outer shell housing that has both excellent and lightweight properties.

[0006]

An outer shell housing of the present invention is provided on an outer shell molded body formed by molding a metal plate into a predetermined housing outer shell shape, and on an inner peripheral surface of the outer shell molded body. And an internal mechanism portion made of a thermoplastic resin injection-molded on the adhesive synthetic resin layer, wherein the adhesive synthetic resin layer is a metal forming the outer shell molded body. And a lower layer made of a synthetic resin having an adhesive property, an upper layer made of a synthetic resin having an adhesive property with the thermoplastic resin, and an intermediate adhesive layer interposed between them to adhere both layers. Characterize.

In the present invention, the metal plate is made of a metal such as iron, aluminum or zinc alloy which can be recycled and can be easily processed by pressing or the like, and has a thickness of 0.5 mm to 0. An 8 mm plate can be used.

As the thermoplastic resin which forms the internal mechanical portion by injection molding, a resin selected from polyethylene, polypropylene, polyamide, polystyrene, polycarbonate, polyethylene terephthalate and ethylene-vinyl alcohol copolymer can be used. it can.

Further, among the three layers constituting the adhesive synthetic resin layer, the lower layer which is in direct contact with the outer shell molded product formed from the metal plate is an ethylene-vinyl acetate copolymer (EV).
A) and ethylene-ethyl acrylate copolymer (EE
It is desirable to use a synthetic resin having adhesiveness to the metal forming the outer shell molded product, such as A) or a copolymer of these copolymers and polyolefin. Further, the upper layer that is in direct contact with the internal mechanism portion is composed of a thermoplastic resin such as polyethylene, polypropylene, polyamide, polystyrene, polycarbonate, polyethylene terephthalate, and ethylene-vinyl alcohol copolymer, which is easily processed into a film, and particularly It is desirable to use the same thermoplastic resin as the resin that constitutes the mechanism section. further,
The intermediate adhesive layer is preferably composed of a copolymer of the synthetic resin forming the lower layer and the synthetic resin forming the upper layer, or a resin modified by mixing both. Here, as a commercial product such as EVA or EEA for the lower layer,
Novatec AP (trade name of Mitsubishi Kasei Co., Ltd.), N polymer (trade name of Nippon Petrochemical Co., Ltd.), Shorex (trade name of Showa Denko KK), Admer (Mitsui Petrochemical Co., Ltd.) ) Company name), Modic (Mitsubishi Petrochemical Co., Ltd.)
Company name), Nukurel (Mitsui DuPont Polychemical Co., Ltd. company name), etc.

In the present invention, the total number of adhesive synthetic resin layers comprising the lower layer, the intermediate adhesive layer and the upper layer is 3 layers.
The thickness is preferably 0 μm to 100 μm. Further, in order to provide such an adhesive synthetic resin layer on the inner peripheral surface of the outer shell molded body, the lower layer, the intermediate adhesive layer and the upper layer are extruded and laminated in this order on one surface of the metal plate, or coextruded 3 After the layered film is pressure-bonded to the metal plate by hot pressing or heat roll, the resulting laminated metal plate is press-molded with the adhesive synthetic resin layer facing inside,
It is possible to adopt a method of molding into a predetermined casing outer shell shape.

[0011]

In the outer shell housing of the present invention, the outer shell molded body formed by molding the metal plate is provided on the outer side, so that the mechanical strength is large and the overall wall thickness can be made thin and lightweight. In addition to being capable, it has high fire resistance and flame resistance. In addition, since the internal mechanism portion of the thermoplastic resin is formed by injection molding inside such a metal outer shell molded body, only the minimum necessary portion can be molded as the internal mechanism portion. It does not require a large injection molding machine with a large clamping pressure.

Further, since the adhesive synthetic resin layer is provided between the metal outer shell formed body and the internal mechanism portion made of the thermoplastic resin, the adhesive strength between the outer shell formed body and the inner mechanism portion is high. Is large and the design appearance is not damaged by adhesion.

Further, when the adhesive synthetic resin layer is a single layer, it has excellent adhesiveness to the metal forming the outer shell molded body and good adhesiveness to the thermoplastic resin forming the internal mechanism portion. Although it is necessary to select a resin to have, and the kind of the thermoplastic resin is also limited, in the outer shell casing of the present invention, the adhesive synthetic resin layer is a synthetic resin having good adhesiveness to metal. Since it has a three-layer structure of a lower layer, a synthetic resin upper layer having good adhesiveness with the thermoplastic resin, and an intermediate adhesive layer for adhering these two layers, the type of the thermoplastic resin is not limited, The internal mechanism can be formed by injection molding various resins.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of an outer shell housing of the present invention, and FIG. 2 is an enlarged view showing a portion A of FIG.

In these figures, reference numeral 1 denotes an outer shell molded body formed by pressing a metal plate made of aluminum or zinc alloy into a predetermined housing outer shell shape, and the inner peripheral surface thereof has an outer shell. Resins such as polyethylene and polypropylene having excellent adhesiveness between the lower layer 2 made of EVA or EEA having excellent adhesiveness to the metal forming the shell molded body 1 and the thermoplastic resin forming the internal mechanism portion described later. And an intermediate adhesive layer 4 made of a resin having excellent adhesiveness to the resins constituting the lower layer 2 and the upper layer 3, respectively.
Is provided with an adhesive synthetic resin layer 5 in which a lower layer 2, an intermediate adhesive layer 4, and an upper layer 3 are laminated in this order. On the adhesive synthetic resin layer 5, polyethylene,
The internal mechanism portion 6 made of a thermoplastic resin such as polypropylene, polyamide, or polystyrene is integrally formed by injection molding.

As a specific example of the housing of the embodiment configured as described above, an example of manufacturing a seat cover inside an automobile is shown below. That is, first, E which has excellent adhesiveness to metal
Novatec AP-270L which is VA, Novatec AP-196P which is a synthetic resin having excellent adhesiveness to both polypropylene and EVA, and adhesive polypropylene 6200E (trade name of Mitsubishi Kasei Co., Ltd.) The thickness was 15 μm, 15 μm and 40 μm, respectively, and extrusion molding was performed into a film so as to form three layers in this order. Then, the obtained adhesive synthetic resin film was laminated on an aluminum plate having a thickness of 0.6 mm with the adhesive polypropylene layer on the outside, and this was sandwiched by a heat press heated to 150 ° C. and pressure-bonded. Next, the laminated plate thus obtained is put into a press die, and press working is performed so that the adhesive synthetic resin film is on the inner side, and then, as shown in FIGS.
An outer shell molded body with an adhesive layer having a shape as shown in (c) was formed. Then, after inserting this molded body into the mold of the injection molding machine, polypropylene 4505J
An outer shell housing having an internal mechanical section 7 as shown in FIGS. 4 (a), (b) and (c) by injection-filling (commercial name of Mitsubishi Kasei Co., Ltd.) into a cavity to solidify Was formed.

The outer shell housing 9 of the embodiment thus manufactured
As shown in the table below, is thinner, lighter, and extremely strong as compared with a conventional housing formed of ABS resin alone. Further, the mold clamping pressure at the time of injection molding can be small, and a large injection molding machine is not required.

[0019]

[Table 1]

[0020]

As described above, in the outer shell housing of the present invention, the metal outer shell and the internal mechanism portion are firmly bonded,
It is thin and lightweight, has high strength, has good fire resistance and flame resistance, and is easy to recycle.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an outer shell housing of the present invention.

FIG. 2 is a sectional view showing a part of the embodiment in an enlarged manner.

FIG. 3 is a view showing an outer shell molded body with an adhesive layer molded in a specific example of the casing of the embodiment, (a) is a front view,
(B) is a side view and (c) is a top view.

4A and 4B are diagrams showing an outer shell casing manufactured in a specific example of the casing of the embodiment, in which FIG. 4A is a front view, FIG. 4B is a side view, and FIG.

[Explanation of symbols]

 1 ………… Outer shell molded body 2 ………… Lower layer of metal adhesive synthetic resin 3 ………… Upper layer of thermoplastic resin adhesive synthetic resin 4 ………… Intermediate adhesive layer 5 ………… Adhesive synthetic resin layer 6, 7 ... Internal mechanism

Claims (4)

[Claims] 1. An outer shell molded body formed by molding a metal plate into a predetermined casing outer shell shape, an adhesive synthetic resin layer provided on an inner peripheral surface of the outer shell molded body, and the adhesive synthetic resin. An inner mechanical part made of a thermoplastic resin injection-molded on the layer, the adhesive synthetic resin layer, a lower layer made of a synthetic resin having adhesiveness to the metal constituting the outer shell molded body, and An upper layer made of a thermoplastic resin and a synthetic resin having adhesiveness,
An outer shell housing comprising: an intermediate adhesive layer interposed between the two and adhering both layers. 2. The lower layer constituting the adhesive synthetic resin layer comprises an olefin-vinyl acetate copolymer, an olefin-unsaturated carboxylic acid ester copolymer, or an olefin or polyamide and a maleic anhydride copolymer. Item 1. The outer shell casing according to item 1. 3. The upper layer constituting the adhesive synthetic resin layer is polyethylene, polypropylene, polyamide, polystyrene, polycarbonate, polyethylene terephthalate,
The outer shell casing according to claim 1 or 2, which is made of a resin selected from ethylene-vinyl alcohol copolymers. 4. The outer shell casing according to claim 1, wherein the interlayer adhesive layer is made of a resin obtained by copolymerizing or mixing a synthetic resin forming a lower layer and a synthetic resin forming an upper layer. .