JPH07195409A - Housing and production thereof - Google Patents

Abstract

PURPOSE:To obtain a sanitary housing generating aroma pleasant to a user by constituting the housing or a part thereof of an external synthetic resin having a soft synthetic resin containing an aroma diffusing substance and partially touching the open air built therein. CONSTITUTION:A housing consisting of an upper housing 1 and a lower housing 2 has a soft resin 3 built therein and the outside thereof is constituted of a hard resin 4 and an aroma diffusing substance is mixed with the soft resin 3. The soft resin 3 built in the hard resin 4 is exposed from the hard resin by the notches 5 provided to the upper and lower housings 1, 2 and touches the open air to diffuse the arom into the housing from the aroma diffusing substance mixed with the soft resin. As the soft resin built in the external synthetic resin constituting the housing, an ethylene/vinyl acetate copolymer resin is pref. from the viewpoint of the adhesiveness with an ABS resin or an ASA resin being the hard resin and the diffusibility of aroma.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case that does not ward off harmful insects such as cockroaches to a case of electric / electronic equipment or the like, or a case that generates a scent that is preferable to a user and its manufacture. Regarding the method.

[0002]

2. Description of the Related Art Conventionally, electric / electronic devices and other housings are
It is made of metal or synthetic resin, and electric parts such as semiconductors, resistors, capacitors, coils, and transformers are mounted on the printed circuit board inside, and air vent holes for radiating the heat generated from these electric parts. Is provided. In addition, for the knobs and the like for operating these devices, a slight gap is provided between the knob and the housing in order to improve operability. Moreover, since the housings of these devices are made of a hard substance, it is difficult to continuously generate a scent that does not ward off harmful insects and a preferable scent.

[0003]

Therefore, mosquitoes, cockroaches, etc. enter through the air vent holes and the gaps between the operating parts and come into contact with the electric parts of the heat source inside the housing, and the printed circuit board is contaminated with secretions. It may cause insulation deterioration, or
The performance may be deteriorated by causing a change in high frequency characteristics due to a change in impedance. For the purpose of preventing this, if air is removed for heat dissipation or the gap between the operating parts is extremely reduced, the temperature inside the housing rises, causing frequency deviation and
The output changes, resulting in poor performance. Also, if the gaps between the operation parts such as the knobs are eliminated, the operation cannot be performed smoothly.

[0004]

The present invention has solved the above problems and invented a housing that is hygienic and produces a scent that is preferable to the user.

According to the present invention, the housing or a part of the housing is constituted by an external synthetic resin containing a soft synthetic resin containing a substance that emits an odor, and a part of the soft synthetic resin inside is formed. Is in contact with the outside air and a manufacturing method thereof.

In the present invention, as the soft synthetic resin (hereinafter, referred to as soft resin) contained in the external synthetic resin (hereinafter, referred to as hard resin) which constitutes the housing, ethylene-vinyl acetate copolymer is used. Combined resin (EVA), butadiene-styrene elastomer, polyester elastomer,
A polyamide elastomer or the like is used. Among these, EVA is a preferable resin in terms of adhesiveness to ABS resin and ASA resin, which are hard resins, and emission of odor.

According to the present invention, the soft resin contains a volatile fragrance and a pest repellent as a substance that emits an odor.
As the substances that emit these odors, natural essential oils, pyrethroid substances and various natural or synthetic flavors can be used.

Examples of natural essential oils include phytoncide, which is an aromatic substance released or secreted from trees and plants, and includes terpenes such as α-pinene, β-pinene, myrcene, camphene and limonene.

As pyrethroid substances, etophene blocks (1- (pethoxyphenyl) -2-methylpropyl-3-phenoxybenzyl ether: trade name "Trepon"), cyphenothrin ((RS-alpha-cyano -3-phenoxybenzyl (1R) -cis /
Trans-chrysanthemate), permethrin (3-phenoxybenzyl-di-cis / trans-3 (2,2
-Dichlorovinyl) -2,2-dimethyl-1-cyclopropanecarboxylate: trade name "Exmine"), allethrin (3-allyl-2-methylcyclopent-2-)
En-4-on-1-yl chrysanthemate) and the like can be used, but the invention is not limited thereto.

As a fragrance for generating a scent that is preferable for users, 6-acetyl-1,1,2,4,4,7-hexamethyltetrahydronaphthalene, γ-untodecalactone, ethyl caproate, ethyl caprylate, Examples include cinnamic alcohol, geranyl acetate, and isoamyl acetate, which can be used, but are not limited thereto.

A substance that emits odor is contained in a soft substance contained in a hard resin, a notch is provided in a part of the housing, and the soft resin is exposed to the outside air so that the outside air is exposed to the outside air. Release slowly. The sustained release divergence may be achieved by exposing the soft resin to the surface of the hole by making a hole and contacting it with the outside air in addition to the notch. The degree of sustained release can be adjusted by the exposed area of the soft resin.

In the present invention, a general thermoplastic resin can be used as the hard resin constituting the housing.
Use of A resin and ABS resin is preferable.

The ASA resin is obtained by graft-polymerizing a vinyl polymer with a vinyl cyanide monomer or an aromatic vinyl monomer, and the rubber polymer is a polymer such as polybutyl acrylate. Acrylate ester rubber, polybutadiene / polybutyl butyl two-stage structure in which polybutyl butyl is provided on the outer layer of polybutadiene, a composite rubber such as a rubbery polymer, a structure in which polyacrylate rubber and siloxane rubber are intertwined with each other. Tori rubber, or a mixture of two or more kinds of these.

In the ASA resin, the vinyl cyanide monomer which is graft-polymerized to the rubbery polymer is acrylonitrile, methacrylonitrile, ethacrylonitrile,
Examples include fumaronitrile, which are used alone or in combination.

As the aromatic vinyl monomer to be graft-polymerized, styrene, α-methylstyrene, o-methylstyrene, 1,3-dimethylstyrene, p-methylstyrene, t-butylstyrene, halogenated styrene. ,
Examples thereof include p-ethylstyrene and the like, which are used alone or in combination of two or more kinds. It may be one obtained by copolymerizing an inferior amount of a methacrylate such as methyl methacrylate or ethyl methacrylate during graft polymerization, or another copolymerizable monomer such as maleimide such as N-phenylmaleimide.

The ABS resin which can be preferably used in the present invention is a resin obtained by graft-polymerizing a vinyl cyanide monomer and an aromatic vinyl monomer to a rubbery polymer composed of butadiene units. As the rubbery polymer, a copolymer containing 50% or more of polybutadiene units and inferior amounts of styrene units and acrylonitrile units,
Examples thereof include styrene-butadiene copolymer and acrylonitrile-butadiene copolymer. As the monomer used for the graft polymerization, the same monomer used for the above-mentioned ASA resin production is used.

In the present invention, the ASA resin and the ABS resin used as the hard resin are polymerized with a monomer composed of vinyl cyanide monomer, aromatic vinyl monomer and other copolymerizable monomer. The copolymer (AS resin) thus obtained can be mixed and used if necessary. In the AS resin, the same vinyl cyanide monomer and aromatic vinyl monomer as those used in the graft polymer can be used.

The hard resin constituting the casing of the present invention can be further improved in heat resistance, rigidity and dimensional stability by blending a reinforcing filler if necessary. The reinforcing filler is at least one kind of inorganic fiber such as glass fiber, carbon fiber or the like and wollastonite, talc, mica powder, glass foil, potassium titanate or the like, but is particularly limited to these. is not. Also,
These crushed products are also preferably used for the purpose of improving the appearance of the housing. The amount of the reinforcing filler used is 0 to 100 parts by weight based on 100 parts by weight of the total amount of the hard resin component.
Further, the hard resin may appropriately contain a modifier, a release agent, a stabilizer against light and heat, a colorant such as a dye or a pigment, and the like, if necessary.

Next, the housing of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view in which a soft resin is embedded in a hard resin in the entire upper housing 1 and the lower housing 2, and a part of the external resin on the inner surface of the housing is cut away. In FIG. 1, reference numeral 1 is an upper housing, 2 is a lower housing, and each housing is composed of a built-in soft resin 3 and an outer side of a hard resin 4, and the soft resin 3 emits an odor. The substance is mixed. Upper housing 1, lower housing 2
In this case, the soft resin 3 contained in the hard resin is exposed by the cutouts 5, and the substance that comes into contact with the outside air and emits the odor mixed in the soft resin is diffused into the housing. In FIG. 1, reference numeral 12 is an operating knob, 13 is a gap between the operating knob and the housing, 14 is a printed circuit board, 15 is an operating component, and 16 is a semiconductor as a heat generating source. Reference numeral 17 is a hole for heat dissipation.

As shown in FIG. 3, for example, as shown in FIG. 3, the notch 5 for releasing the odor is made thicker in the portion where the notch is to be provided in advance to form a protrusion 51, and the protrusion 5 is formed.
1 is mechanically cut with an end mill or the like to expose the soft resin 3 contained therein as shown at 5 in FIG. As for the exposed portion 5 of the inner soft resin, a hole 7 may be provided as shown in FIG. 4 to expose the soft resin 5 on the hole surface.

In FIG. 4, in the mold of the lower housing 2, the part where a hole is to be formed in a molded product in which a soft resin is embedded in a hard resin is a separate piece, and a low frequency vibration of about 20 Hz is applied to that part. By simultaneously cutting (drilling) the hard resin on the outside and the soft resin on the inside, the soft synthetic resin on the inside comes into contact with the outside air. As another processing method, a fine groove is formed by making a cut with an end mill or the like. A hole for heat dissipation may have a width of 2 mm and a length of 10 to 20 mm.

As shown in FIG. 6, the lower housing 2 is replaceable and has a mounting part 6 in which the soft resin 3 is mixed.
May be fitted in the through hole 8 of the lower housing 2. As shown in FIG. 5, the attachment part 6 is made of a hard resin 4, a core is provided with a soft resin 3 containing a substance that emits an odor, and a notch 61 is provided at the center to expose the soft resin 3. is doing. The mounting part 6 is fitted into the through hole 8 of the lower housing 2 to make it less slippery at the installation site by the rubber feet 62, and the notch 61 of the mounting part 6 gradually releases the substance that emits an odor into the housing. . When it is no longer released, replace it with a new attachment part 6. Reference numeral 63 is a locking portion for the through hole 8.

FIG. 7 shows that the mouthpiece portion 91 of the telephone 9 is molded into the hard resin with the soft resin and then the acoustic hole 9 is formed.
2 can be mechanically drilled as described in FIG. 4 or can be low frequency vibration. In the case of a handset having a structure in which the mouthpiece portion can be removed, only the mouthpiece portion may be molded with the soft resin.

In the present invention, as a method of exposing the soft resin inside, when the soft resin is injected from the inside of the casing with a submarine gate or the like, the gate portion or the gate cut portion is automatically exposed. The housing may be filled with an odor when the built-in soft resin is exposed to the outside air. Furthermore, when screwing a substrate or the like to the lower housing, if the external hard resin is scraped off with the screw and brought into contact with the internal soft resin, the scent component contained in the internal soft resin is released. You can

Next, with reference to FIGS. 8 and 9, a process of molding a case or a part of the case of a soft resin containing a substance emitting an odor in a hard resin will be described. FIG. 8 shows an injection head for molding the casing of the present invention, and the reference symbol A is the first.
In the cylinder, the hard resin 4 melted from the first screw B, the reference numeral C, the molten soft resin 3 containing a substance that emits an odor is pressure-fed from the second screw D and passes through the nozzle E. It is a figure which shows the outline of the apparatus sent to a shaping die (not shown) and shape | molded.

FIG. 9 is a view showing the injection amount (filling amount) in the first cylinder A for injecting the hard resin and the second cylinder C for injecting the soft resin in terms of elapsed time. In FIG. 9, the shaded portion shows the injection amount of the first cylinder A, and the dotted portion shows the injection timing and the injection amount of the second cylinder C.

(A) A substance which emits an odor is mixed with a soft resin. (B) The hard resin 4 is fed to the first cylinder A from the first screw B, and the soft resin is fed to the second cylinder C by the second screw D. (C) First, pressure is applied to the inside of the first cylinder A by the first screw B, and the hard resin 4 is injected into the mold through the nozzle E. (D) After a delay, the soft resin 3 is injected into the second cylinder C by the second screw D through the nozzle E into the hard resin in the mold. (E) When the pressure in the second cylinder C reaches the maximum value, the injection of the hard resin 4 is suppressed. The resin passing through the nozzle E is almost the soft resin 3. (F) Stop the injection of the second cylinder C and inject the resin in the first cylinder A. (G) Finish the injection. After cooling, take out the molded product. (H) Make a cut or cut a part of the outer hard resin forming the housing so that the soft resin is exposed to the outside air. Or make a hole.

[0028]

The present invention will be described in more detail with reference to the following examples. In the examples, "part" and "%" mean "part by weight" and "% by weight", respectively.

(Production of Soft Resin 1) A mixture having the following compounding ratio was used in a cylinder temperature of 1 using a 30 mm twin-screw extruder.
Shaped into pellets at 50 ° C. Ethylene-vinyl acetate copolymer Showlex FM-22-1 (trade name, manufactured by Showa Denko KK) 100 parts Viva essential oil 0.5 parts

(Production of Soft Resin 2) A mixture having the following compounding ratio was used to make a cylinder temperature 1 using a 30 mm twin-screw extruder.
Pelletized at 50 ° C. Sholex FM-22-1 (manufactured by Showa Denko KK) 100 parts Etofenprox (pest repellent) 0.5 parts

(Production of Soft Resin 3) A mixture having the following compounding ratio was used to prepare a cylinder temperature of 1 using a 30 mm twin screw extruder.
Pelletized at 50 ° C. Showlex FM-22-1 (manufactured by Showa Denko KK) 100 parts Isoamyl acetate 0.5 parts

(Hard resin ASA resin) Dialax S-310 (trade name, manufactured by Mitsubishi Rayon Co., Ltd.)

(Hard resin ABS resin) Diapet 3001 (trade name, Mitsubishi Rayon Co., Ltd.)
Made)

In order to obtain a housing having a soft resin inside and a hard resin outside, a J-220E / P2M type multi-function injection molding machine (manufactured by Japan Steel Works, Ltd.) was used and injection molding was performed under the following conditions. went. Molding condition Soft synthetic resin Cylinder temperature 160 ℃ Hard synthetic resin Cylinder temperature 230 ℃

FIG. 1 shows the molding conditions for the above soft and hard resins.
4 and FIGS. 6 and 7 were obtained. Food, water, and 20 German cockroaches were placed in a box made of transparent acrylic resin and wire mesh inside and outside each of the obtained casings.
After one week, the percentage of cockroaches living in the housing was determined. The results are shown in Table 1.

Separately, regarding the shape shown in FIG. 2 and FIG.
It was evaluated by a human sensitivity test. The results are shown in Table 2.

[0037]

INDUSTRIAL APPLICABILITY The casing of the present invention is capable of gradually releasing odor, and the soft synthetic resin containing the odor-releasing component is gradually released depending on the degree to which it is exposed to the outside air. Can be adjusted to prevent harmful insects from invading the housing and to release a scent that is preferable to human beings, which is hygienic and has an excellent effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a housing in which an upper housing and a lower housing are integrated.

FIG. 2 is a sectional view in which a part of hard resin of a lower housing is cut away.

FIG. 3 is a cross-sectional view of the lower housing before cutting out a part of the hard resin in FIG.

FIG. 4 is a cross-sectional view of a lower housing in which a hole is provided (cut out) in the housing.

FIG. 5 is an enlarged cross-sectional view of a mounting body whose inside is made of soft synthetic resin.

FIG. 6 is a cross-sectional view of a lower housing to which a mounting body is attached.

FIG. 7 is a cross-sectional view of a telephone handset.

FIG. 8 is a schematic view of an injection head for molding the casing of the present invention.

FIG. 9 is a diagram showing the injection amount of each cylinder over time when molding is performed.

[Explanation of symbols]

 1 Upper Case 2 Lower Case 3 Soft Synthetic Resin 4 Hard Synthetic Resin 5 Exposed Part 6 Mounting Body 9 Handset A First Cylinder B First Screw C Second Cylinder C Second Screw E Nozzle

[Table 1]

[Table 2]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Shimazaki 2-23-2 Nishigotanda, Shinagawa-ku, Tokyo Kanda Communication Industry Co., Ltd.

Claims (7)

[Claims] 1. A housing or a part of the housing is made of an external synthetic resin containing a soft synthetic resin containing a substance that emits an odor, and a part of the soft synthetic resin inside is outside air. A case characterized by touching. 2. The casing according to claim 1, wherein the substance that emits an odor is a natural essential oil (having a pest repellent property) or a pyrethroid type substance. 3. The casing according to claim 1, wherein the substance that emits an odor is a fragrance. 4. The housing according to claim 1, wherein the soft synthetic resin is an ethylene-vinyl acetate copolymer. 5. The housing according to claim 1, wherein the external synthetic resin is an ASA resin. 6. The housing according to claim 1, wherein the external synthetic resin is ABS. 7. A nozzle for injecting a resin into a mold is provided with a first cylinder and a second cylinder, and a synthetic resin constituting the outside of the casing is emitted from the first cylinder and an odor is emitted from the second cylinder. The soft synthetic resin that composes the inside of the housing containing the substance to be injected into the mold by adjusting the injection timing of each, and inside the external synthetic resin,
Inject soft synthetic resin to mold the housing or part of it,
A method of manufacturing a housing, characterized by cutting or notching a part of an external resin of the housing taken out from a mold.