JP2001180764A - Pressure control structure for cooking package used in microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure control structure for cooking package which releases the pressure when the internal pressure of the cooking package is increased by heating in a microwave oven. SOLUTION: A composite sheet 20a of a cooking package 10 is composed of a base sheet 30a having a slit 32a and a cover layer 40 for covering the slit 32a. As the internal opressure of the package 10 increases by heating, the slit 32a is opened with a tensile force applied to the base sheet 30a and furthermore a crack is formed with the cover layer 40 stretched, and thereby an opening 50 communicating with the slit 32a is formed. Then, the internal pressure of the package 10 is released through the opening 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a microwave cooking package in which food or beverage is sealed and cooking of food or beverage is performed using a heating function of a microwave oven.

[0002]

2. Description of the Related Art Conventionally, a food and drink such as a frozen food or a processed food is hermetically stored in a package, and the package can be heated and cooked in a microwave as it is, if necessary. There is. When a package containing food inside is heated in a microwave oven, moisture contained in the food evaporates, the air inside the package expands, and the internal pressure gradually increases to expand the package. May burst. for that reason,
Microwave cooking packages must have means for relieving and controlling internal pressure.

[0003] Therefore, there is a conventional package in which a sheet of heat-resistant plastic or the like is heat-sealed to form a bag, and a low-melting-point sealing portion is provided in at least one portion of the bag. Since the fusion strength of the low melting point seal part is weaker than other fusion parts, if this package is heated in a microwave oven and the internal pressure rises, the low melting point seal part peels off and communicates with the outside, and the pressure inside the package increases. To escape.

[0004] Further, instead of providing the low melting point sealing portion, there is a type in which a through hole having an appropriate size is formed at an appropriate position of a package, and the internal pressure of the package is controlled by the through hole. The through-hole of this package is covered with a seal at the time of shipment / transportation. At the time of cooking, the seal is peeled off and then heated by a microwave oven.

[0005] As a conventional microwave cooking package, in addition to the above-mentioned bag-shaped package, there is a package in which food is put in a heat-resistant container and the opening of the container is covered with a sheet. Also in this case, a low-melting-point sealing portion is provided on the sheet covering the opening of the container or a through-hole is formed to release and control the internal pressure.

[0006]

However, in a microwave cooking package having a low melting point seal portion, a package for conveying and cooking is not provided.
Even when the packages are stacked during storage, the low melting point seal portion must have sufficient adhesive strength so that the low melting point seal portion does not peel off by its own weight. Therefore, there is a problem that when the package is heated and the internal pressure rises and the low-melting-point sealing portion is peeled off, a considerable impact is applied, and in some cases, the package vibrates greatly and the food inside may be spilled. In addition, before and after the low melting point seal portion is peeled off, the internal pressure of the package greatly changes, so that the contents may be damaged.

On the other hand, a microwave cooking package having a through hole has a problem in that a through hole must be formed in the sheet, and processing is troublesome. In addition, if a through hole having an appropriate size and not formed in an appropriate place is shipped as a product due to a processing error, there is a risk that the package may burst when heated. Therefore, the actual drilling process must be performed carefully with the production line stopped, and there is a problem that productivity is poor. Further, when a through hole is formed in the sheet, it is necessary to check whether or not the cut-out fragments have entered the inside of the package, so that there is a problem that the equipment cost for quality control increases. If the seal is forgotten to be removed during cooking, the package may be ruptured by heating.

Further, in a microwave cooking package having a through-hole formed therein, the through-hole must be enlarged in order to ensure safety during use. It is difficult to properly maintain

[0009]

SUMMARY OF THE INVENTION The present invention firstly provides a microwave cooking package in which food and drink are enclosed, comprising a composite sheet having a base sheet coated with a cover layer on the surface thereof. Has a slit or a fine hole, the slit or the fine hole expanded by heat and pressure communicates with the crack of the cover layer formed by heat and pressure to form an opening, and the opening releases pressure. Due to the pressure control structure of the microwave cooking package which is made to function,
In a microwave cooking package in which food or drink is enclosed, a composite sheet in which a base sheet and a cover sheet are bonded via an adhesive layer, wherein the base sheet and the cover sheet have slits or micro holes An opening is formed by communication between the slits or micropores of the two sheets spread by heat and pressure and a crack in the adhesive layer formed by heat and pressure, and a pressure release function is provided by the opening. The above-mentioned problem has been solved by a pressure control structure of a microwave cooking package which fulfills the above requirements.

[0010]

According to the present invention, first, a base sheet having slits or fine holes is coated with a cover layer, and second, a base sheet having slits or fine holes and a cover sheet are interposed via an adhesive layer. When the pressure inside the package rises as the food or beverage in the package is heated, the slits or micropores in the base sheet and the cover sheet are expanded, and the cover layer or the adhesive layer is extended to crack. As a result, the slit or micropore communicates with the crack to form an opening, which releases the internal pressure of the package. In addition, it is possible to efficiently heat the package under a pressurized state without changing the amount of water (the amount of water vapor) released from the inside of the package depending on the length and number of slits of the base sheet and the cover sheet and the number of the fine holes.

[0011]

FIG. 1 shows a composite sheet 20a of a cooking package 10 according to a first embodiment of the present invention.
FIG. 1A is a front view, and FIG. 1B is bb in FIG. 1A.
It is a line sectional enlarged view. Although the actual package is in the shape of a bag, FIG. 1 shows only a portion related to pressure control of the package. The composite sheet 20a of the cooking package 10 includes a base sheet 30a having a plurality of slits 32a and a cover layer 40 coated so as to cover the surface of the base sheet 30a. In addition,
The slit 32a of the base sheet 30a is provided so as to be entirely circular (see FIG. 1A). Since the surface of the base sheet 30a is covered with the cover layer 40, the inside and outside of the package 10 do not communicate with each other through the slits 32a of the base sheet 30a when the package 10 is not heated. A synthetic resin such as polyethylene or polypropylene can be used as the cover layer constituting the package, but it must be one that does not transfer to the back surface of the base sheet even if it is wound on a roll after being coated on the base sheet.

FIGS. 2 to 4 are explanatory views showing a pressure control function of the cooking package 10 of FIG. 1. Specifically, a slit 32a having a length of 2.5 mm is provided.
A composite sheet 20 comprising ten base sheets 30a provided at intervals of 3.78 mm so as to be arranged on a circumference having a diameter of 20 mm and a cover layer 40 covering the surface of the base sheet 30a.
a (see FIG. 2A) was used. When the food or drink in the package 10 is heated to generate water vapor and the package 10 expands due to this, the composite sheet 20a includes
The tensile force is applied in the direction indicated by the arrow in (b),
The slit 32a of the base sheet 30a opens. Note that this tensile force gradually increases as the internal pressure of the package 10 increases.

When the cover layer 40 is further heated, the tensile force causes the cover layer 40 in the portion covering the slit 32a to elongate and cause a crack, and an opening 50 for communicating the inside and outside of the package 10 appears (see FIG. 4). The water vapor in the package 10 is released to the outside through the opening 50.

FIG. 5 is a cross-sectional view of a cooking package 10 according to the first embodiment of the present invention in which food and drink are enclosed. The composite sheet 20a of the cooking package 10 is
As shown in FIG. 2, a polypropylene sheet having a thickness of 0.03 mm is used as a base sheet 30 a and slits 32 a are provided, and a cover layer 40 a made of resin is formed on the surface of the base sheet 30 a by a thickness of about 0.01 to 0.015 mm. It is coated so as to have a thickness of. This composite sheet 20a was cut into a width of 300 mm and a length of 300 mm, folded in half, and sealed on three sides with a width of 10 mm to produce a bag-shaped cooking package of 150 mm in width and 300 mm in length. This cooking package 10
, Add 100g of raw spinach and 10
mm in width and sealed (see FIG. 5).

The above-mentioned spinach-containing package 10 is
Put into a microwave oven with high frequency output of 500W and set the timer to 1
The switch was turned on after setting to 30 minutes. At about 55 seconds after the start of heating, the moisture contained in the spinach gradually evaporates due to heating, and the cooking package 10 starts to expand. After 1 minute and 10 seconds from the start of heating, the internal pressure of the package 10 becomes about 1. 3 kg / cm ² and the temperature rose to 106 ° C. When the cooking package 10 expands and the internal pressure increases, the base sheet 30 is added to the composite sheet 20a.
a to open the slit 32a and apply a tensile force to the cover layer 40a so as to cause a crack in the cover layer 40a.
An opening 50 is formed in the portion a, and the water vapor inside the package 10 is released to the outside through the opening 50 (see FIGS. 3 and 4). Then package 1
0 is a set pressure of 1.15 Kg / cm ² and a temperature of 1
The temperature was kept at 03 ° C., and the cooking was completed after about 20 seconds. During the above cooking, steam is released from the opening 50 of the composite sheet 20a, so that the package 10 does not expand and break, and the spinach is efficiently cooked in a short time of 1 minute 30 seconds from the start of heating. We were able to.

According to the above configuration, even if heating is performed for the same time using a package of the same size, depending on the length and number of slits provided in the composite sheet, the steam pressure accumulated in the package during heating, the pressure after heating, and the like. The state of the package is different. Table 1 shows that packages of 150 mm in width and 250 mm in length provided with different lengths and number of slits, sealed with 50 g of water, and heated for 180 seconds in a microwave oven with a power of 500 W for 180 seconds. It shows the moisture content, the sheet elongation, the state of the package after heating, and the like.

[Table 1] From Table 1, if the length and number of slits are appropriately changed in accordance with the strength of the composite sheet and the type of food or beverage to be enclosed in the package, moisture of the food or beverage is unnecessarily heated by heating while preventing the package from bursting. It can be seen that it can be adjusted so as not to evaporate.

In the cooking package 10 of the present invention described above, the slit 32a of the base sheet 30a is provided.
Are provided so as to be circular as a whole as shown in FIG. 1, but the number and shape of the slits are not limited to this. FIG. 6 shows an example of the cooking packages 10a, 10b, 10c, 10d, and 10e of the present invention in which the number of slits and the shape in which the slits are provided are changed. FIG. 6A shows one in which one linear slit 32a is provided, FIG. 6B shows one in which two slits 32a are provided in parallel at an interval of 5 mm, and FIG. FIG. 6D shows one set of slits 32a, 32a provided in parallel at a pitch of 10 mm (the interval between adjacent slits 32a, 32a is 5 mm). FIG. FIG. 6 shows four sets of slits 32a, 32a shown in FIG.
(E) is a set of slits 32a and 32 shown in FIG.
a are provided in eight sets.

If the slit 32a is provided in a shape having a corner such as a rectangle, the tensile force tends to concentrate at the corner and the package may be broken. Curve shape with little Further, it is desirable that the package is arranged so that the adjacent slits communicate with each other so that a part of the package is not cut out to generate fragments.

The above-mentioned cooking packages 10, 10a, 1
0b, 10c, 10d, and 10e are base sheets 30a.
Is provided with a slit 32a, but a fine hole 32b may be provided instead of the slit 32a if the opening 50 is generated by a tensile force. FIG. 7 shows a composite sheet 20b of the cooking package 12 according to the second embodiment of the present invention. FIG. 7 (a) is a front view, and FIG. 7 (b) is an enlarged sectional view taken along line bb of FIG. FIG. 7 (c) is a partially enlarged view of FIG. 7 (a). The composite sheet 20b according to this embodiment includes a first sheet.
Like the embodiment, the base sheet 30b and the cover layer 40 are provided.
2b is different from that of the first embodiment. The fine holes 32b have a hole diameter of 0.05 mm or less, and are provided so as to be arranged on the circumference of the diameter A, as shown in FIG. 7C, and the distance between the adjacent fine holes 32b is L.
It is. Since the fine holes 32b of the base sheet have a hole diameter of 0.05 mm or less, the moisture in the package can pass through the fine holes 32b in a gaseous state such as water vapor. Under the environment, in the liquid state, the micropores 3
2b cannot pass.

FIGS. 8 to 10 are explanatory views showing a pressure control function of the cooking package 12 using the composite sheet 20b shown in FIG. When the food or drink in the package 12 is heated to generate water vapor and the package 12 expands due to this, the composite sheet 20b has the shape shown in FIG.
The tensile force is applied in the direction indicated by the arrow in (b),
The fine holes in the base sheet 30b are widened. This tensile force gradually increases as the internal pressure of the package 12 increases.

When the cover layer 40 is further heated, the portion of the cover layer 40 covering the fine holes 32b is extended by the tensile force, so that an opening 50 for communicating between the inside and the outside of the package 12 appears (see FIG. 10). The water vapor in the package 12 is released to the outside. When the amount of water vapor inside the package further increases, each fine hole 32b may be expanded and communicate with an adjacent fine hole 32b (FIG. 1).
See 0 (b). In this case, the area of the opening 50 becomes larger. As a result, rupture of the package can be more reliably prevented.

Next, FIG. 11 shows a composite sheet 20c of the cooking package 14 according to a third embodiment of the present invention,
11A is a front view, FIG. 11B is an enlarged cross-sectional view taken along line bb of FIG. 11A, and FIG. 11C is an enlarged partial view of FIG. The composite sheet 20c of this embodiment also includes a base sheet 30c and a cover layer 40. The base sheet 30c has fine holes 32c having a hole diameter of 0.05 mm or less.
Is provided. These fine holes 32c are provided so as to be arranged on a spiral having a maximum diameter of A, and the distance between adjacent fine holes 32c is L.

FIG. 12 shows a composite sheet 20d of a cooking package 16 according to a fourth embodiment of the present invention, wherein FIG. 12 (a) is a front view, and FIG. 12 (b) is FIG.
FIG. 12A is an enlarged cross-sectional view taken along line bb of FIG.
It is the elements on larger scale of (a). The composite sheet 20d of this embodiment also includes a base sheet 30d and a cover layer 40,
In the circle having the diameter A of the base sheet 30d, the hole diameter is 0.05.
Many fine holes 32d of not more than mm are uniformly provided.

A case where food and drink are sealed in the cooking package 16 shown in FIG. 12 and heated will be described with reference to FIG. Base sheet 3 of this cooking package 16
As 0d, a polyethylene sheet having a thickness of 0.03 mm is used, and fine holes 32d having an average of 0.05 mm are provided in a circle having a diameter of 30 mm of the base sheet 30d. Is coated with a resin to a thickness of 0.005 mm to 0.01 mm (see FIG. 12). The composite sheet 20d composed of the base sheet 30d and the cover layer 40 is converted to a width of 260 mm and a length of 200 m.
m, folded and sealed on three sides with a width of 10 mm to produce a bag-like cooking package 16 having a width of 130 mm and a length of 200 mm. In this cooking package 16,
120 g of seasoned white fish surimi was added, and the other side was sealed with a width of 10 mm.

The above-mentioned cooking package 16 containing white fish
Was placed in a microwave oven with a high-frequency output of 500 W, the timer was set to 3 minutes, and the switch was turned on. At about 1 minute and 45 seconds after the start of heating, the water of the white fish itself gradually evaporates and the cooking package 16 starts to expand. After 2 minutes and 5 seconds from the start of heating, the internal pressure of the package 16 becomes about 1. 5
Kg / cm ² and the temperature rose to 110 ° C. FIG.
(B), as shown in the partially enlarged sectional view of FIG.
When the cooking package 16 expands and the internal pressure rises, a tensile force acts on the composite sheet 20d in a direction to expand the fine holes 32d, and finally an opening 50 is formed. The water vapor inside the package 16 is released to the outside. Thereafter, the inside of the package 16 is set at 1.2 Kg / cm ² at a set pressure and at a temperature of 104 ° C.
, And the cooking was completed after about 55 seconds. During the above-described cooking, the steam is released from the opening 50 of the composite sheet 20d, so that the package 16 does not expand and break, and the raw white fish surimi can be efficiently removed in a short time of 3 minutes from the start of heating. Cooking was possible.

Next, FIG. 14 shows a composite sheet 200a of the cooking package 100 according to the fifth embodiment of the present invention, FIG. 14 (a) is a front view, and FIG. 14 (b) is FIG.
FIG. 14A is an enlarged cross-sectional view taken along line bb of FIG.
It is the elements on larger scale of (a). The composite sheet 200a of this embodiment is obtained by laminating a cover sheet 400a on a base sheet 300a via a laminating adhesive 600. As shown in FIG.
A plurality of fine holes 320a are uniformly provided in a circle having a diameter A of 00a, and a plurality of slits 420 are formed in the cover sheet 400a along the circumference of a circle smaller than the diameter A.
a is provided.

When the cooking package 100 of this embodiment is heated, a tensile force acts on the composite sheet 200a as in the case of the above embodiment. Composite sheet 200a
, The fine holes 320a of the base sheet 300a are expanded, the slits 420a of the cover sheet 400a are opened, and the fine holes 320a and the slits 420 are formed.
a and an opening (not shown) is formed, and the inside and outside of the package 100 communicate with each other.

Next, a composite sheet 200b of the cooking package 102 according to the sixth embodiment of the present invention shown in FIG. 15 is obtained by cutting a part of the cover sheet 400a in the composite sheet 100 shown in FIG. And FIG.
15A is a front view, and FIG. 15B is bb in FIG. 15A.
15 (c) is a partially enlarged view of FIG. 15 (a). In the composite sheet 200b of this embodiment, a circular cutout hole 440b is provided in a part of the cover sheet 400b so that the fine holes 320b are not covered by the cover sheet 400b. Therefore, the package of this embodiment is easier to release the internal pressure of the package than that of FIG.

FIG. 16 shows a composite sheet 200c of the cooking package 104 according to the seventh embodiment of the present invention. FIG. 16 (a) is a front view, and FIG. 16 (b) is b in FIG. 16 (a).
FIG. 16 (c) is a partially enlarged view of FIG. 16 (a). The composite sheet 200c of this embodiment includes:
It comprises a base sheet 300c having fine holes 320c and a cover sheet 400c having spiral cuts 420c, both of which are joined by a laminating adhesive 600.

FIG. 17 shows a composite sheet 200d of a cooking package 106 according to an eighth embodiment of the present invention. FIG. 17 (a) is a front view, and FIG. 17 (b) is FIG.
FIG. 17A is an enlarged cross-sectional view taken along line bb of FIG.
It is the elements on larger scale of (a). In this embodiment, the fine holes 3
Cover sheets 400 d and 400 d ′ are fixed to the upper and lower surfaces of a base sheet 300 d provided with 20 d via laminating adhesives 600 and 600.
As shown in FIGS. 17B and 17C, a plurality of slits 420d and 420d 'are provided in each cover sheet 400d and 400d' along the circumference of a circle smaller than the diameter A. .

Finally, FIG. 18 shows a composite sheet of the cooking package 108 according to the ninth embodiment of the present invention. FIG. 18 (a) is a front view, and FIG. 18 (b) is FIG. 18 (b).
FIG. 18 (c) is a partially enlarged view of FIG. 18 (a). This composite sheet 200e is similar to the composite sheet 200d shown in FIG.
00e, and a lower cover sheet 400e ', but a circular cutout 440e is provided in a part of the lower cover sheet 400e' so that the fine holes 320e are not covered by the lower cover sheet 400e '. FIG. 17
, The internal pressure of the package 108 can be released easily. Further, in the ninth embodiment, the cutout holes 4 are provided instead of the upper cover sheet 400e.
The same one as the lower cover sheet 400e 'provided with 40e may be used (not shown). In this case, since the fine holes 320e provided in the base sheet 300e are not covered by the upper and lower cover sheets 400e and 400e ', the internal pressure of the package can be released more easily.

In the sixth and ninth embodiments of the present invention shown in FIGS. 14 and 18, a composite sheet in which a base sheet and a cover sheet are bonded is used to improve the strength of the package. However, in these embodiments, the micropores of the base sheet are not covered with the cover sheet, but are covered only with the adhesive layer. In these embodiments, the adhesive layer functions as a cover layer by coating. ing. Therefore, the “cover layer” of claim 1 includes such an adhesive layer.

The cooking packages 10, 12, 14, 16, 100, 102, 104, 1 of the present invention described above.
06, 108 of composite sheets 20a, 20b, 20c, 2
0d, 200a, 200b, 200c, 200d, 20
0e, the slits 32a and 32b and the fine holes 32
c, 32d, 320a, 320b, 320c, 320
By appropriately changing the position or the number of d and 320e, heating cooking suitable for food and drink in the package can be performed.

The cooking packages 10, 12, 1 of the present invention
4,16,100,102,104,106,108
Since the opening 50 is generated by a tensile force acting under the heating condition, the water vapor inside the package can be released to the outside.

The composite sheet 2 of the cooking package of the present invention
0a, 20b, 20c, 20d, 200a, 200b,
Since the openings 200c, 200d, and 200e have slits and micropores that are widened by the pulling force to reveal the openings, there is no need for drilling or the like, and the production is easy, and there is no debris due to cutout.

[0036]

According to the above configuration, the cooking package according to the present invention has an effect that the steam can be surely released and the pressure control function can be achieved while the manufacturing is easy. In addition, when a plurality of slits and fine holes are provided, even if the amount of water vapor in the package increases rapidly during heating, the cooking can be continued more safely without bursting the package.

The amount of water vapor released can be adjusted by appropriately changing the shape and number of slits, the number of micropores, and the like.

Furthermore, since the cracks generated by heating are sufficiently small, the liquid in the package may leak out of the cracks during and after heating, causing burns to the user and soiling the microwave oven. Absent. Also, if the water vapor inside the package condenses after cooking, the fine cracks are covered with water droplets and the package returns to the sealed state again,
In the case of cooking a boiled dish by enclosing a liquid in a package, even if a small amount of seasoning is used, it spreads throughout the food inside and easily penetrates the food material.

[Brief description of the drawings]

FIG. 1 shows a composite sheet of a cooking package according to a first embodiment of the present invention, FIG.
FIG. 2B is an enlarged cross-sectional view taken along the line bb of FIG.

FIG. 2 is a view for explaining a pressure control function of the cooking package of FIG. 1; FIG. 2 (a) is a front view of an unheated composite sheet; FIG. 2 (b) is FIG.
FIG. 3A is a sectional view taken along line bb of FIG.

3A and 3B are views for explaining a pressure control function of the cooking package of FIG. 1; FIG. 3A is a front view of a composite sheet in a state where pressure is applied, and FIG. FIG. 3A is a sectional view taken along line bb of FIG.

FIG. 4 is a view for explaining a pressure control function of the cooking package of FIG. 1; FIG. 4 (a) is a front view and a view of a composite sheet in a state where a large pressure is applied to the inside and an opening is formed; 4B is a cross-sectional view taken along the line bb in FIG.

FIG. 5 is an explanatory diagram in the case of heating and cooking surimi of white fish using the cooking package of FIG. 1;

FIG. 6 is a front view showing an example of the cooking package of the present invention in which the number of slits and the shape in which the slits are provided are changed.

7A and 7B show a composite sheet of a cooking package according to a second embodiment of the present invention, and FIG. 7A is a front view and FIG.
7B is an enlarged cross-sectional view taken along the line bb of FIG. 7A, and FIG.
7 is a partially enlarged view of FIG.

8 is a diagram for explaining a pressure control function of the cooking package of FIG. 7; FIG. 8 (a) is a front view of a composite sheet in a state where no pressure is applied; FIG. 8 (b) is FIG. FIG. 3A is a sectional view taken along line bb of FIG.

9A and 9B are views for explaining a pressure control function of the cooking package of FIG. 7; FIG. 9A is a front view of a composite sheet in a state where pressure is applied, and FIG. 9B is FIG. FIG. 3A is a sectional view taken along line bb of FIG.

10 is a view for explaining a pressure control function of the cooking package of FIG. 7; FIG. 10 (a) is a front view of the composite sheet in a state where a large pressure is applied inside and an opening is formed; 10B is a cross-sectional view taken along the line bb of FIG.

11 shows a composite sheet of a cooking package according to a third embodiment of the present invention, FIG. 11 (a) is a front view, and FIG.
1 (b) is a cross-sectional view taken along the line bb of FIG.
FIG. 12C is a partially enlarged view of FIG.

FIG. 12 shows a composite sheet of a cooking package according to a fourth embodiment of the present invention, and FIG. 12 (a) is a front view, FIG.
2B is a sectional view taken along line bb of FIG.
FIG. 13C is a partially enlarged view of FIG.

FIG. 13 is an explanatory view in the case of heating and cooking white fish surimi with the cooking package of FIG. 12;
13B is a cross-sectional view of the cooking package, FIG. 13B is a partially enlarged cross-sectional view showing a state where pressure is applied to the package, and FIG.
(C) is a partial enlarged sectional view showing a state where an opening is formed.

FIG. 14 shows a composite sheet of a cooking package according to a fifth embodiment of the present invention, and FIG. 14 (a) is a front view, FIG.
4 (b) is a sectional view taken along the line bb in FIG.
14C is a partially enlarged view of FIG.

15 shows a composite sheet of a cooking package according to a sixth embodiment of the present invention, FIG. 15 (a) is a front view, and FIG.
5B is a cross-sectional view taken along the line bb of FIG.
15C is a partially enlarged view of FIG.

FIG. 16 shows a composite sheet of a cooking package according to a seventh embodiment of the present invention, and FIG. 16 (a) is a front view, FIG.
6 (b) is a sectional view taken along line bb of FIG.
FIG. 17C is a partially enlarged view of FIG.

FIG. 17 shows a composite sheet of a cooking package according to an eighth embodiment of the present invention. FIG. 17 (a) is a front view, FIG.
7 (b) is a sectional view taken along the line bb in FIG.
FIG. 17C is a partially enlarged view of FIG.

FIG. 18 shows a composite sheet of a cooking package according to a ninth embodiment of the present invention. FIG. 18 (a) is a front view, and FIG.
FIG. 8B is a sectional view taken along line bb of FIG.
FIG. 18C is a partially enlarged view of FIG.

[Explanation of symbols]

10, 10a, 10b, 10c, 10d, 10e, 1
2,14,16,100,102,104,106,1
08: Cooking package 20a, 20b, 20c, 20d, 200a, 200
b, 200c, 200d, 200e: Composite sheet 30a, 30b, 30c, 30d, 300a, 300
b, 300c, 300d, 300e: base sheet 32a: slit 32b, 32c, 32d, 320a, 320b, 320
c, 320d, 320e: micropore 40: cover layer 400a, 400b, 400c, 400d, 400
d ', 400e, 400e': cover sheet 420a, 420c, 420d, 420d ', 420
e: slit 440b, 440e: cutout hole 50: opening 600: laminating adhesive

Continued on the front page F term (reference) 3E064 BA22 BB03 EA30 FA01 HD02 HE03 3L086 AA01 BF05 DA01 4B055 AA10 BA03 BA07 BA52 CA19 CA73 CB07 DB15 FA03 FB33 FB35 FC02 FC09 FD10 FE10

Claims (3)

[Claims] 1. A package for microwave cooking in which food and drink are enclosed therein, comprising a composite sheet having a cover layer coated on the surface of a base sheet, wherein the base sheet has slits or micro holes, and heat and pressure. The slits or micropores widened by the cracks of the cover layer formed by heat and pressure communicate with each other to form an opening, and the opening performs a pressure releasing function. Pressure control structure for microwave cooking package. 2. A package for microwave cooking in which food or drink is enclosed therein, comprising a composite sheet in which a base sheet and a cover sheet are bonded via an adhesive layer, wherein the base sheet and the cover sheet are slits. Or, provided with fine holes, the slits or fine holes of the two sheets spread by heat and pressure, and the cracks of the adhesive layer formed by heat and pressure communicate with each other to form an opening, A pressure control structure of a microwave cooking package characterized by performing a pressure release function. 3. The pressure control structure of a microwave oven cooking package according to claim 2, wherein both sides of said base sheet are covered with said cover sheet.