JPH05296461A - Door panel structure for oven/microwave oven - Google Patents

Abstract

(57) [Summary] (Modified) [Structure] The main part is composed of a laminated body that is attached to the open part of the oven microwave oven so as to be openable and closable, and that includes an inner transparent body 14, an electromagnetic wave shield member 12, and an outer transparent body 11. In the oven microwave door panel structure described above, the inner transparent body 14 is a pressure-sensitive adhesive sheet having perforations 16 or perforated parts in the peripheral adhesive portion of the electromagnetic wave shield member 12. It will be a door panel structure. [Effect] Bubbles generated even if heating is accelerated are released from the perforations or the perforation processing part, and blistering or peeling does not occur in the peripheral adhesive part of the electromagnetic wave shield member, and the heat resistance is high and by the coating method. It is also possible to form a multilayer film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door panel structure for an oven microwave oven, and more particularly to a door panel structure for an oven microwave oven which is lightweight, low in cost, excellent in durability and swelling resistant. ..

[0002]

2. Description of the Related Art A microwave oven of this type is shown in FIG.
As shown in FIG. 7, it is known that a main part of an oven microwave oven main body a having an opening a1 on the front side and a door panel structure b attached to the opening a1 so as to be openable and closable are the main components. Has been.

The conventional door panel structure b is, as shown in FIG. 8, an outer transparent body b1 made of heat-resistant glass and an electromagnetic wave inside the oven microwave oven main body a which is laminated on the outer transparent body b1 to leak outside. And an electromagnetic wave shield member b2 made of a coated steel plate provided with a mesh m so that the inside of the oven microwave oven main body a can be seen, and an inner transparent body b4 made of heat-resistant glass provided through a space b3 for heat insulation. The door frame b5 for holding each member and the like constitutes the main part thereof.

However, the door panel structure having such a structure has a drawback that the weight thereof is heavy and the operability is poor, and that an expensive heat-resistant glass is required, resulting in a high manufacturing cost.

Under such a technical background, a door panel structure for reducing the weight and the cost as shown in FIG. 9 has been developed for the microwave oven without the oven function.

That is, this door panel structure is an electromagnetic wave shield member composed of an outer transparent body b1 made of polycarbonate and a coated steel plate provided with a mesh m as in the conventional case.
b2, an inner transparent body b4 made of a polyethylene terephthalate film adhered to the electromagnetic wave shield member b2 via an acrylic adhesive b6, and a door frame for holding these
The main part is composed of b5, and by using polycarbonate or polyethylene terephthalate film instead of heat-resistant glass, its weight and cost can be reduced.

Regarding an oven microwave oven having an oven function, the present inventors filed Japanese Patent Application No. 3-089.
No. 390, Japanese Utility Model Application No. 3-100383, which is composed of a polyimide film or a polyparabanic acid film, a polyethylene naphthalate film, and a heat-resistant polyethylene terephthalate film, which are adhered to the electromagnetic wave shielding member as an inner transparent body through a silicone adhesive. By using the above-mentioned pressure-sensitive adhesive sheet, the drawbacks such as increased weight and poor operability were solved. However, after sticking these pressure-sensitive adhesive sheets to the electromagnetic wave shielding member, and when heating is promoted, the pressure-sensitive adhesive sheet swells from the surface of the electromagnetic wave shielding member in the peripheral adhesion portion of the electromagnetic wave shielding member, resulting in poor appearance. There was a drawback that the product value declined.

[0008]

By the way, when the door panel structure having the above structure is directly applied to an oven microwave oven having an oven function, the adhesive sheet and the electromagnetic wave shielding member are bonded together when the adhesive sheet is bonded to the electromagnetic wave shielding member. Air may be caught between and. It is quite difficult to prevent the entrapment of air and bond the adhesive sheet to the electromagnetic wave shield member. There is a problem that when the laminated door panel structures are heated and promoted, the entrained air expands and swells in the peripheral adhesive portion of the electromagnetic wave shield member.

The present invention has been made in view of these problems, and its object is to make a door panel structure for an oven microwave oven which is lightweight, low in cost, excellent in durability and resistant to blistering. To provide the body.

[0010]

That is, the invention according to claim 1 is a main part of a laminated body composed of an inner transparent body, an electromagnetic wave shield member, and an outer transparent body which is openably and closably attached to an open portion of an oven microwave oven main body. Assuming that the oven microwave door panel structure is configured, the inner transparent body is a polyimide film, a polyparabanic acid film, a polyethylene naphthalate film, or a heat-resistant material that is adhered to the electromagnetic wave shielding member via a silicone-based adhesive. It is characterized in that the peripheral adhesive portion of the electromagnetic wave shielding member is perforated or perforated with an adhesive sheet selected from a flexible polyethylene terephthalate film.

In such a technical means, the outer transparent body provided on the outer side of the door panel structure is not exposed to a higher temperature than the inner transparent body.
Polycarbonate that is applied to the outer transparent body of the microwave oven can be applied, and although it adds a little weight,
Of course, it does not matter if the heat-resistant glass is applied.

As for the electromagnetic wave shield member, a coated steel plate provided with a mesh can be applied as it is as in the conventional case.

[0013]

According to the first aspect of the present invention, the inner transparent body of the door panel structure is adhered to the electromagnetic wave shield member via the silicone adhesive, the polyimide film, the polyparabanic acid film, the polyethylene naphthalate film or the heat-resistant material. Adhesive sheet made of flexible polyethylene terephthalate film has perforations or perforations on the peripheral adhesive part of the electromagnetic wave shielding member, so even if the door panel structure laminated with the adhesive sheet is heated, it is rolled up. The air is released from the perforations or the perforated portion, and the swelling does not occur in the peripheral adhesive portion of the electromagnetic wave shield member, which is favorable.

Further, as compared with the conventional door panel structure whose inner transparent body is made of heat resistant glass, the weight and cost can be significantly reduced.

FIG. 1 shows a sectional structure of the door panel structure according to the embodiment.
0 is an outer transparent body 11 made of heat-resistant glass, an electromagnetic wave shielding member 12 made of a coated steel plate laminated on the outer transparent body 11 and provided with a mesh, and a silicone adhesive layer 13 for the electromagnetic wave shielding member 12. The door frame 15 for holding the respective members bonded via the above and the air discharge holes 16 or 17 constitute the main part thereof.

2 to 5 are plan views of an adhesive sheet obtained by applying an adhesive to an inner transparent body according to the embodiment. Perforation processing 16 or perforation processing 1 is shown.
7 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0017]

【Example】

[Example 1] A polyimide film (PI ... Ube Industries Co., Ltd. product name Upilex) substrate cut to a thickness of 50 μm and 170 × 320 mm, and a silicone-based adhesive (Toray Dow Corning Silicone product name) SD458
0) was applied and dried to obtain an inner transparent body 14 in which a polyimide film having a thickness of 50 μm and on which the silicone-based adhesive layer 13 was formed was perforated 16.

Next, the outer transparent body 11 made of heat resistant glass.
The inner transparent body 14 is attached to the electromagnetic wave shielding member 12 made of a coated steel plate on which the silicone-based adhesive layer 13 is laminated.
The oven microwave oven door panel structure as shown in FIG. 1 was manufactured by placing it so that its side was in contact with the electromagnetic wave shield member 12 and adhering it by applying pressure, and further fitting these members into the door frame 15.

[Example 2] Instead of the above-mentioned polyimide film, a polyparabanic acid film (PPA ... trade name Soldax manufactured by Tonen Kagaku Co., Ltd.) having a thickness of 50 µm and cut into 170 x 320 mm was used, and a silicone type was used. (Toray Dow Corning Silicone Co., Ltd. trade name SD4580) was applied as an adhesive material, and the polyparabanic acid film on which the silicone-based adhesive layer 13 having a thickness of 50 μm was formed was subjected to the perforation process 17 and was omitted from Example 1. Is the same

Example 3 A polyethylene naphthalate film (PEN ... Teonex, trade name, manufactured by Teijin Ltd.) cut to a thickness of 50 μm and 170 × 320 mm was used in place of the polyparabanic acid film, and a silicone-based film was used. (Toray Dow Corning Silicone Co., Ltd. trade name SD4580) was applied as an adhesive material, and the perforation process 17 was omitted except that the polyethylene naphthalate film on which the silicone-based adhesive layer 13 having a thickness of 50 μm was formed was perforated 17. Is the same

Example 4 Instead of the polyethylene naphthalate film, a thickness of 50 μm was 170 × 320 mm.
Heat-resistant polyethylene terephthalate film (PET ... Toray Co., Ltd. product name Lumirror low heat shrinkage type) cut into is used as a silicone adhesive (Toray
(Product name SD4580 manufactured by Dow Corning Silicone)
Is substantially the same as in Example 1 except that a polyethylene terephthalate film having a thickness of 50 μm and a silicone-based adhesive layer 13 formed thereon is perforated 16.

Comparative Example 1 170 × 32 with a thickness of 50 μm
A polyparabanic acid film (PPA ... Tonen Chemical Co., Ltd. product name Soldax) cut to 0 mm is used, and a silicone adhesive (Toray Dow Corning Silicone product name SD4580) is applied. 50μ
m Example 1 except that a silicone-based adhesive layer of m was formed.
Is almost the same as.

Comparative Example 2 170 × 32 with a thickness of 50 μm
Silicone adhesive (Toray Dow Corning Silicone Co., Ltd. product name SD4580) is applied to a polyimide film (PI ... Ube Industries Co., Ltd. product name Upilex) base material cut to 0 mm to a thickness of 50 μm. The procedure is substantially the same as in Example 1 except that the adhesive layer is formed.

[Comparative Example 3] 170 × 32 with a thickness of 50 μm
Silicone adhesive (Toray Dow Corning Silicone product name SD4580) applied to a polyethylene naphthalate film (PEN ... Teijin product name Teonex) base material cut to 0 mm thickness of 50 μm It is substantially the same as Example 1 except that a layer was formed.

[Confirmation Test] Next, in order to confirm the characteristics of the door panel structure according to each example and the door panel structure according to each comparative example, each of these door panel structures was incorporated into the oven microwave oven main body, and 500 For each door panel structure, a time mounting test was performed to check whether the inner transparent body was blistered or peeled. The results are shown in Table 1 below.

[0026]

[Table 1]

In the table, ◯ means that the inner transparent body did not swell or peel off. The mark x indicates that the inner transparent body was blistered and peeled off.

"Evaluation" As is clear from the results of Table 1,
It was confirmed that the door panel structures according to the examples did not cause swelling or peeling of the inner transparent body and were extremely excellent. On the other hand, in the door panel structures according to Comparative Examples 1 to 3, the inner transparent body was swelled in the peripheral adhesive portion of the electromagnetic wave shield member, and a good result was not obtained.

[0029]

According to the invention of claim 1, since the inner transparent body is a pressure-sensitive adhesive sheet having perforations or perforations on the peripheral adhesive portion of the electromagnetic wave shielding member, it is generated even when heating is accelerated. Bubbles are released by perforation or perforation processing, and blistering or peeling does not occur in the peripheral adhesive portion of the electromagnetic wave shield member, which is good.

Further, as compared with the conventional door panel structure whose inner transparent body is made of heat-resistant glass, the weight and cost can be significantly reduced.

[0031]

[Brief description of drawings]

FIG. 1 is a sectional view of a door panel structure of an oven microwave oven according to an embodiment.

FIG. 2 is a plan view of an inner transparent body having an adhesive layer according to an example.

FIG. 3 is a plan view of an inner transparent body having an adhesive layer according to an example.

FIG. 4 is a cross-sectional view of an inner transparent body provided with an adhesive layer according to an example.

FIG. 5 is a cross-sectional view of an inner transparent body having an adhesive layer according to an example.

FIG. 6 is a perspective view of an oven microwave oven.

FIG. 7 is a perspective view of the oven microwave oven with the door panel structure open.

FIG. 8 is a cross-sectional view of a door panel structure in a conventional microwave oven.

FIG. 9 is a sectional view of a door panel structure in a conventional microwave oven.

[Explanation of symbols]

 10 Door Panel Structure 11 Outer Transparent Body 12 Electromagnetic Wave Shielding Member 13 Silicone Adhesive Layer 14 Inner Transparent Body 15 Door Frame 16 Perforations 17 Perforation Processing

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masao Nakajima 1-5-1 Taito, Taito-ku, Tokyo Within Toppan Printing Co., Ltd. (72) Koichi Nishikawa 1-1-5 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (1)

[Claims] 1. A door panel structure for an oven microwave oven, the main part of which is a laminated body composed of an inner transparent body, an electromagnetic wave shield member, and an outer transparent body, which is openably and closably attached to an open portion of an oven microwave oven body. A door panel structure for an oven microwave oven, wherein the inner transparent body is an adhesive sheet in which a peripheral adhesive portion of an electromagnetic wave shield member is perforated or perforated.