JPH06104084A - Method for manufacturing oven microwave oven door panel structure - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] To provide a method for manufacturing a door panel structure of an oven microwave oven which is lightweight, has low cost, has excellent durability, and has swelling resistance. In a method of manufacturing a door panel structure 10 for an oven microwave oven, which comprises an inner transparent body 14, an electromagnetic wave shield member 12, and an outer transparent body 11, the inner transparent body comprises a heat-resistant sheet laminated with an adhesive, and the heat-resistant sheet. Is laminated on the electromagnetic wave shielding member via the adhesive layer, and 100 ° C to 2
It is heated to 00 ℃ and the roll linear pressure is 2 to 10 kg / cm.
The method for manufacturing an oven microwave oven door panel structure is characterized in that the heat-resistant sheet is attached by applying the pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing 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 resistant to blistering. The present invention relates to a manufacturing method.

[0002]

2. Description of the Related Art This type of microwave oven is shown in FIG.
As shown in FIG. 3, it is known that an oven microwave oven main body a having an opening portion a1 on the front side and a door panel structure b attached to the opening portion a1 so as to be openable and closable form a main portion thereof. Has been.

In the conventional door panel structure b, as shown in FIG. 4, an outer transparent body b1 made of heat-resistant glass and an electromagnetic wave in the oven microwave oven main body a which is laminated on the outer transparent body b1 are leaked to the 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.
The inner transparent body b4 made of heat-resistant glass provided via a space b3 for heat insulation, and a door frame b5 for holding each of these members constitute a main part.

However, the door panel structure having such a structure has a drawback that it is heavy and has poor operability, and
Since expensive heat-resistant glass is required, there is a drawback that the manufacturing cost is high.

Under such a technical background, in a microwave oven not having the above-mentioned oven function, a door panel structure having a weight and a cost as shown in FIG. 5 has been developed.

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 shielding member b2 via an acrylic adhesive b6, and a door frame holding these
The main part is composed of b5, and the use of polycarbonate or polyethylene terephthalate film instead of heat-resistant glass made it possible to reduce its weight and cost.

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 adhesive sheet prepared as above, the drawbacks such as increased weight and poor operability have been solved. However, after sticking these pressure-sensitive adhesive sheets to the electromagnetic wave shield member, when heat is promoted, the pressure-sensitive adhesive sheet swells from the surface of the electromagnetic wave shield member in the peripheral adhesion portion of the electromagnetic wave shield member, resulting in poor appearance, There was a drawback that the product value declined.

Against these blister, the inventors of the present invention solved the problem by applying perforation or perforation processing to the peripheral adhesive portion of the electromagnetic wave shielding member of the inner transparent body in Japanese Patent Application No. 4-101002. There were problems such as time-consuming and poor appearance.

[0009]

By the way, when the door panel structure having the above structure is applied as it is to an oven microwave oven having an oven function, the adhesive sheet and the electromagnetic wave shield member are stuck together when the adhesive sheet is attached to the electromagnetic wave shield 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. When the laminated door panel structure is heated and promoted, the air entrapped expands, causing a problem of swelling in the peripheral adhesive portion of the electromagnetic wave shield member.

The present invention has been made by paying attention to such a problem, and the problem is that the door panel of an oven microwave oven is light in weight, low in cost, excellent in durability and swelling resistant. It is to provide a method for manufacturing a structure.

[0011]

That is, according to the present invention, the main portion of the present invention is constituted by a laminated body which is openably and closably attached to an open portion of an oven microwave oven main body, and which comprises an inner transparent body, an electromagnetic wave shield member and an outer transparent body. In the method of manufacturing a door panel structure for an oven microwave oven, the inner transparent body is composed of a heat-resistant sheet in which an adhesive is laminated, and the heat-resistant sheet is superposed on an electromagnetic wave shield member via an adhesive layer,
It is heated to 100-200 ℃ and the roll linear pressure is 2-1.
A method of manufacturing an oven microwave oven door panel structure, which comprises applying a heat resistant sheet by applying a pressure of 0 kg / cm.

The heat-resistant sheet used in the present invention means a polyimide film, a polyparabanic acid film, a polyethersulfone film, a polyetheretherketone film, which is adhered to an electromagnetic wave shield member via an adhesive.
It is selected from a polyethylene naphthalate film or a heat-resistant polyethylene terephthalate film. This heat-resistant sheet is laminated on an electromagnetic wave shielding member via a pressure-sensitive adhesive or an adhesive layer, and the heat-resistant sheet is attached by applying heat and pressure. It is characterized by that.

In such a technical means, the outer transparent body provided on the outer side of the door panel structure is not exposed to higher temperatures than the inner transparent body.
Polycarbonate applied to the outer transparent body of the microwave oven can be applied, and the weight increases slightly,
Of course, it does not matter if 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.

The pressure-sensitive adhesive used for the inner transparent body of the door panel structure of the present invention may be a silicone-based pressure-sensitive adhesive having excellent heat resistance. When a synthetic rubber adhesive or an acrylic adhesive other than the silicone adhesive is used, the heat resistance of these is about 100 ° C. for the synthetic rubber and about 130 ° C. for the acrylic adhesive. On the other hand, the internal temperature of the oven microwave oven is locally set to 200 to 300 ° C., so that the yellowing of the adhesive itself occurs, the adhesive force is lost, and the inner transparent body is peeled off.

The silicone-based pressure-sensitive adhesive is composed of a silicone gum which has a linear structure and is involved in film-forming property and cohesive force, and a silicone resin which has a complicated three-dimensional structure and is involved in viscosity, tack and adhesive force. The composition is crosslinked using a catalyst. The silicone-based pressure-sensitive adhesive used in the inner transparent body of the present invention is preferably a cross-linking reaction product of a silicone resin and a silicone gum, the main component of which is 64% by weight or more of the silicone resin based on the solid content. The pressure-sensitive adhesive having such a ratio has a low tack at normal temperature and has a high tack when heated at 100 ° C. or higher, and has a property that it can be attached to an adherend.

Of course, if there is an adhesive or an adhesive excellent in heat resistance other than these silicone-based adhesives, it can be used.

As a method for attaching the heat-resistant sheet which is the inner transparent body of the present invention to the electromagnetic wave shielding member, first, the heat-resistant sheet is superposed on the electromagnetic wave shielding member via the adhesive layer 1
Heat to 00 ° C-200 ° C. Then, using a hand roller having a width of 5 cm and a weight of 20 kg, the linear pressure is 2-1.
A pressure is applied so that the pressure becomes 0 kg / cm, and the product is reciprocated once to apply pressure to the heat-resistant sheet to attach the sheet. In this case, using a heat roller or a flat-pressure heat press, heating and pressing may be performed at the same time, but if the pressure is too high, the film used for the inner transparent body is wrinkled or the electromagnetic wave shielding member is distorted. Etc. problems arise.

[0019]

According to the first aspect of the present invention, since the inner transparent body of the door panel structure is attached to the electromagnetic wave shield member by heating and pressurizing, the heated adhesive resin is softened and the adherend is adhered to the adherend. The contact area of the pressure-sensitive adhesive increases as it penetrates into the details of a certain electromagnetic wave shield member surface. Therefore, air is less likely to be entrapped during sticking, and blistering does not occur, 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.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 shows a sectional structure of the door panel structure according to the embodiment.
Reference numeral 0 denotes an outer transparent body 11 made of heat-resistant glass, an electromagnetic wave shield 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 shield member 12. The main part is constituted by the door frame 15 that holds each member bonded via the above.

[Example 1] 170 × 32 with a thickness of 50 μm
Polyimide film cut to 0 mm (Ube Industries, Ltd.)
Product name "Upilex") A base material is coated with a silicone-based pressure-sensitive adhesive obtained by crosslinking a silicone composition having a weight ratio of silicone gum and silicone resin of 29:71.
And dried to a silicone-based adhesive layer 13 having a thickness of 30 μm
Inner transparent body 1 made of a polyimide film on which is formed
I asked for 4.

Next, the outer transparent body 11 made of heat-resistant glass
The inner transparent body 14 is attached to the silicone-based adhesive layer 13 with respect to the electromagnetic wave shielding member 12 made of coated steel sheets laminated with each other.
Place it so that its side is in contact with the electromagnetic wave shield member 12, and
After placing in an atmosphere of 20 ° C for 3 minutes, width 5 cm, weight 20 k
It was stuck back and forth once with a hand roller of g. Further, these members were fitted into the door frame 15 to manufacture a door panel structure for an oven microwave oven as shown in FIG.

[Example 2] Instead of the above-mentioned polyimide film, a polyparabanic acid film (trade name "Soldax" manufactured by Tonen Kagaku KK) having a thickness of 50 µm and cut into 170 x 320 mm was applied, and a thickness of 50 µm. The polyparabanic acid film was attached in substantially the same steps as in Example 1 except that the silicone-based adhesive layer 13 was formed.

[Example 3] Instead of the above-mentioned polyimide film, a polyethersulfone film (trade name "TALPA-1000" manufactured by Mitsui Toatsu Chemicals, Inc.) having a thickness of 50 µm and cut into 170 x 320 mm was used. And thickness 50μ
In the same process as in Example 1, except that the silicone-based adhesive layer 13 of m was formed, a polyether sulfone film was applied to the electromagnetic wave shielding member 12 made of a coated steel plate on which the outer transparent body 11 was laminated. I stuck it.

Example 4 Instead of the above-mentioned polyimide film, a polyethylene naphthalate film (trade name “Teonex” manufactured by Teijin Limited) having a thickness of 50 μm and cut into 170 × 320 mm was used, and a thickness of 50 μm was used. A polyethylene naphthalate film was attached in substantially the same steps as in Example 1 except that the silicone-based adhesive layer 13 was formed.

[Embodiment 5] Instead of the above-mentioned polyimide film, a heat-resistant polyethylene terephthalate film cut to a thickness of 50 μm and 170 × 320 mm (Toray Industries, Inc.)
A coated steel sheet on which an outer transparent body 11 is laminated in exactly the same process as in Example 1 except that a product name “Lumirror low heat shrinkage type”) is used and a silicone-based adhesive layer 13 having a thickness of 50 μm is formed. Made electromagnetic wave shield member 12,
A heat resistant polyethylene terephthalate film was attached.

[Comparative Example 1] As a method for adhering the inner transparent body 14, the inner transparent body 14 was prepared by using the silicone-based adhesive layer 1 thereof.
Place it so that the 3 side is in contact with the electromagnetic wave shield member 12,
The method of applying pressure after placing it in an atmosphere of 120 ° C. for 3 minutes is 12
Adhesion was performed in substantially the same steps as in Example 1 except that only heating at 0 ° C was performed.

[Comparative Example 2] As a method for adhering the above-mentioned inner transparent body 14, the inner transparent body 14 was made into a silicone-based adhesive layer 13 thereof.
Place it so that its side is in contact with the electromagnetic wave shield member 12, and
Adhesion was performed in substantially the same steps as in Example 1 except that the method of placing the product in an atmosphere of 20 ° C. for 3 minutes and then applying pressure with a hand roller was only pressing with a hand roller.

[Comparative Example 3] A silicone-based adhesive having a composition ratio of 43:57 was used in place of the silicone-based adhesive obtained by crosslinking the silicone composition in which the weight ratio of the silicone gum to the silicone resin was 29:71. As a method of adhering the inner transparent body 14, the inner transparent body 14 is placed so that its silicone adhesive layer 13 side is in contact with the electromagnetic wave shielding member 12, and after being placed in an atmosphere of 120 ° C. for 3 minutes, a hand roller is used. The sticking was carried out in substantially the same steps as in Example 1 except that the pressing was performed only by using a hand roller.

[Comparative Example 4] Except that a polyparabanic acid film was applied instead of the above polyimide film,
Adhesion was performed in the same steps as in Comparative Example 3.

[Comparative Example 5] Adhesion was performed in exactly the same steps as in Comparative Example 3 except that a polyether sulfone film was used instead of the above-mentioned polyimide film.

[Comparative Example 6] Adhesion was performed in exactly the same steps as in Comparative Example 3 except that a polyethylene naphthalate film was used instead of the above polyimide film.

[Comparative Example 7] Adhesion was performed in exactly the same steps as in Comparative Example 3 except that a heat resistant polyethylene terephthalate film was used instead of the above polyimide film.

[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 an oven microwave oven main body for 500 hours. Of each door panel structure was checked for floating, peeling, heat shrinkage, and swelling. The results are shown in Table 1 below.

[0037]

[Table 1]

In the table, ◯ indicates that the inner transparent body did not float, peel, heat shrink and swell, and x indicates that the inner transparent body floats, peels, heat shrinks and blister. It is shown that. Also, in the sticking method, ●
It shows that the attachment was performed by the method marked with.

As is clear from the results of "Evaluation" (Table 1), the door panel structures according to the examples are extremely excellent in that the inside transparent body does not float, peel, heat shrink or swell. It could be confirmed.

On the other hand, in the door panel structure of Comparative Example 1, since the inner transparent body was adhered to the electromagnetic wave shield member only by heating, unevenness occurred in the adhered portion. Further, when a mounting test was conducted, good results could not be obtained because floating and peeling, which are thought to be caused by uneven adhesion, were observed, and swelling was observed in the peripheral adhesive portion of the electromagnetic wave shield member.

Further, in the door panel structure according to Comparative Example 2, since the inner transparent body is adhered to the electromagnetic wave shield member only by applying pressure, the adhesion is insufficient and unevenness occurs in the adhered portion. It was Further implementation test,
Floating and peeling, which are thought to be caused by uneven adhesion, and swelling were observed in the peripheral adhesive portion of the electromagnetic wave shield member, and good results were not obtained.

Next, with respect to the door panel structures according to Comparative Examples 3 to 7, the floating, peeling, and heat shrinkage were the same as those in the example, but swelling was observed in the peripheral adhesion portion of the electromagnetic wave shielding member, which was good. No results were obtained.

[0043]

According to the first aspect of the invention, since the inner transparent body is attached to the electromagnetic wave shield member by heating and pressurizing, the heated adhesive resin is softened while generating tack. In addition, it has an effect that even if it penetrates into the details of the surface of the electromagnetic wave shield member that is the adherend and the contact area of the pressure-sensitive adhesive becomes large, it becomes difficult for air to be entrapped and the occurrence of blistering disappears.

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

[0045]

[Brief description of drawings]

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

FIG. 2 is a perspective view of an oven microwave oven.

FIG. 3 is a perspective view of an oven microwave oven with a door panel structure opened.

FIG. 4 is a cross-sectional view of a door panel structure in a conventional microwave oven.

FIG. 5 is a cross-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-Based Adhesive Layer 14 Inner Transparent Body 15 Door Frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Hotta 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (2)

[Claims] 1. A manufacturing method of 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 main body. In the method, the inner transparent body is composed of a heat-resistant sheet in which an adhesive is laminated, and the heat-resistant sheet is superposed on an electromagnetic wave shielding member via an adhesive layer and heated to 100 ° C to 200 ° C,
A method for manufacturing an oven microwave oven door panel structure, which comprises applying a heat-resistant sheet by applying a roll linear pressure of 2 to 10 kg / cm. 2. The method for manufacturing an oven microwave oven door panel structure according to claim 1, wherein the pressure-sensitive adhesive is a silicone-based pressure-sensitive adhesive obtained by crosslinking a silicone composition comprising a silicone gum and a silicone resin.