JP2001058680A - Easily unsealable package body for electromagnetic heating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent excessive condensed dew of food from returning thereto when reheating food such as hamburger or the like by forming a packaging body from at least an external layer sheet and a liquid-absorbing internal layer sheet and arranging an unsealing means in at least a part of these sheets. SOLUTION: The chief part of a bag 10 for packaging food is formed of an external layer sheet 1, a liquid-absorbing internal layer sheet 2 and an unsealing means 3. One end of the bag 10 is formed of a heat-seal part 4, and the cylindrical part is formed by a connection part 11, and an opening 12 is disposed to insert food. In this time, the unsealing means 3 is formed of an unsealing tape 5 stuck to the external layer sheet 1 parallel to the insertion direction of food and a lug 9 formed by forming a fold 8 from the heat-seal part 4 to a cut part 6 in such a state that the end of the unsealing tape 5 is held in the center. In this way, excessive drip water is prevented from returning to the food when reheating the food and the bag 10 can be unsealed securely and rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for electromagnetic heating which is easy to open, and in particular, repackages foods such as hot docks and hamburgers sold in convenience stores and the like with an electromagnetic heater such as a microwave oven. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package for preventing the flavor of a food from being impaired by excess moisture or oil coming out of the food when subjected to a heat treatment, and for easily and reliably opening the food when the food is taken out.

[0002]

2. Description of the Related Art Generally, hot docks and hamburgers sold at convenience stores and the like are
They are placed in containers or sheets made of paper or plastic. These foods are reheated in a microwave oven with each container or sheet before eating, but when heating in a microwave oven, steam is generated inside, and this steam does not escape to the outside, And dew condensation
For example, it adheres to the surface of a hamburger or the like, and makes the surface of the food jumbled. Also, when the cooked food is placed in a container while the food is hot, the taste of the food is also impaired by the generated steam and dew water. As described above, when excess dew water is generated and left unattended, there is a problem that the appearance of the food becomes poor or the taste is impaired.

[0003] In order to improve such problems, for example, a sheet or bag (actually disclosed in Japanese Utility Model Application Laid-open No. 3-1), in which a surface layer in contact with foodstuffs is formed into a liquid-permeable sheet and a water-absorbing sheet is contained in the inner layer.
No. 08671, No. 6-25141, No. 6-6
No. 1089, JP-A-3-200755, and JP-A-6-3
No. 5164) has been proposed. In these sheets and bags, a water-absorbing sheet is arranged under the inner layer sheet in contact with food, excess water generated is transferred to the water-absorbing layer through the inner layer sheet, the dew water generated by the water-absorbing layer is retained, and the inner layer sheet is held. It is intended to prevent excess moisture from being left behind and to improve the wetting back to the surface of the food material.

[0004] On the other hand, in convenience stores and the like, it is desired to store these bags in a sanitary manner and to quickly and easily open the sealed bags when consumers eat. However, in the bags obtained by these conventional techniques, a simple and hygienic opening method was not disclosed. Also, even in microwave oven bags such as hamburgers actually sold at convenience stores, etc., only a cut is provided at the end of the bag as an opening means,
When trying to open from this cutout, the opening at a certain part is not always performed, and the food pops out, and the chips from the cutout get stuck on the food, causing problems when eating Had occurred. on the other hand,
Some bags, such as sandwiches and rice balls, that are eaten without being heated in a microwave oven, were provided with opening means.However, these bags are not compatible with microwave ovens and have a bag structure that does not transfer dew condensation etc. to food. (Japanese Unexamined Patent Publication No.
No. 40015, JP-A-8-91430).

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-mentioned drawbacks and to produce extra dew condensation on foods such as hamburgers sold at convenience stores when the foods are reheated in a microwave oven. An object of the present invention is to provide a food package for electromagnetic heating which can reduce the re-wetting of water, store it hygienically, and can reliably and quickly open it when eating.

[0006]

Means for Solving the Problems To solve the above problems, the invention claimed in the present application is as follows.

(1) A package of an article composed of at least an outer layer sheet (A) and a liquid-absorbing inner layer sheet (B), wherein at least a part of the sheet forming the package is provided with an opening means (C). ), A package for electromagnetic heating.

(2) The opening means (C) attaches a tape or a thread to the outer layer sheet (A) or a sheet integrated therewith in a direction parallel to or perpendicular to the direction of insertion of the article; The electromagnetic heating device according to (1), wherein a grip portion is provided at one end thereof, and the tape-like material or the thread-like material is peeled off from the package together with the sheet by pulling the grip portion, and the package is opened. Packaging.

(3) The water-absorbing sheet (D) is disposed between the outer layer sheet (A) and the liquid absorbing inner layer sheet (B). Packaging for electromagnetic heating.

(4) The inner sheet (B) is made of a nonwoven fabric composed of polyolefin fibers (1) or (3)
Packaging for electromagnetic heating.

(5) The inner sheet (B) is used in an area ratio of 40% or more and 100% or less with respect to the outer layer sheet (A), and the inner sheet is disposed at the bottom of the package. The electromagnetic heating package according to any one of (1) to (4), wherein an unsealing outer sheet is provided with an opening means.

(6) The package for electromagnetic heating according to any one of (1) to (5), wherein the outer layer sheet (A) is made of a transparent resin film.

Hereinafter, the present invention will be described in detail with reference to the drawings. FIGS. 1, 2, and 4 are schematic diagrams of a food packaging bag (1) of the present invention. FIG. 1 is a square packaging bag, FIG. 2 is a packaging bag using a water absorbing sheet and an inner layer sheet, and FIG. Shows a packaging bag.

The bag 10 shown in FIG. 1 is an outer layer sheet (A)
1 and a liquid-absorbent inner layer sheet (B) provided inside thereof
2 and an opening means (C) 3. 4
Is a heat seal portion for forming one end of the bag, and 11 is
A joining portion for forming a tubular portion, 12 indicates an opening for inserting a food. The opening means (C) 3 comprises an opening tape 5 bonded to the outer layer sheet 1 in parallel with the food insertion direction (longitudinal direction of the bag) and an end portion of the opening tape 5 sandwiched in the center. A grip portion 9 is formed by inserting a fold 8 from the heat sealing portion 4 to the cutting portion 6.

The bag 10 shown in FIG. 2 is the same as the bag shown in FIG.
A is provided, and a window 7 formed of a transparent film is provided at the center portion. In this case, the transparent film portion 7 constitutes a part of the outer layer sheet 1, and the opening tape 5 is adhered to the central portion thereof. An enlarged view of the opening means (C) 3 is shown in FIG.

The bag 10 shown in FIG. 4 has a heat-sealing portion 4 at the periphery except for the opening 12, and the opening tape 5 is placed on the outer layer sheet 1 in a direction perpendicular to the direction of inserting the food into the opening 12. Are laminated to form an opening means (C) 3. An enlarged view of the opening means (C) 3 is shown in FIG.

These bags 10 are used for inserting foods and sealing the opening portions 12 to become commodities. When heating the foods with a microwave oven or the like, the bags 10 are gripped by the opening means (C) 3. By pinching the part 9 with a finger and peeling off the opening tape 5,
Can be easily opened.

The outer layer sheet (A) 1 may be any sheet as long as extra oil or moisture generated inside when food is wrapped and heated in a microwave oven is not excessive outside. When heated in a microwave oven, the food itself becomes hot, but when taking out or wrapping it in a sheet and eating it in consideration of preventing burns, the outer layer sheet is less likely to conduct heat, and oil or moisture may be present on the outside of the bag. It is better not to bleed. Examples of these sheets include, for example, papers, sheets in which paper is thinly coated with polyethylene or polypropylene resin, polypropylene, polyethylene, polyester, polyamide, resin films such as polyvinyl alcohol, and resins such as these resins and polystyrene. Examples of the sheet include a foam sheet, a sheet having moisture permeability and waterproofness such as a nonwoven fabric or a microporous film obtained by a flash spinning method or the like. When it is assumed that the bag-shaped package is sold at a convenience store or the like, it is preferable that a part of the outer layer sheet is transparent and the food inside can be seen from the outside of the bag. For this purpose, the outer layer sheet is a transparent resin film, or a bag in which a window-like material is formed with a transparent resin film on a part of a sheet in which paper or the like is thinly coated with polyethylene or polypropylene resin. More preferred.

The basis weight and thickness of the outer layer sheet are determined by
If you consider that the mold may break, break, or enter dust,
5g / m^TwoAbove, 100g
/ M ^TwoThe following is good. 0.005mm or less in thickness
Above, 1 mm or less is preferable.

The outer layer sheet may have moisture permeability, or may have a part of the sheet perforated.
These are more preferably selected as appropriate according to the amount of moisture generated from the food to be used, for the purpose of driving out excess steam heated by a microwave oven out of the sheet or bag.

Liquid-absorbent inner layer sheet (B) 2 of the present invention
If it is a sheet that can hold dew water generated in a microwave oven, use paper, nonwoven fabric, sponge, water-absorbing porous resin film-like material that is appropriately mixed with natural fibers, chemical fibers, and synthetic fibers. Can be. In view of workability during bag making and ease of heat sealing, a nonwoven fabric obtained from synthetic fibers or paper mixed with synthetic fibers is desirable.

The material of the fibers constituting the inner layer sheet (B) is more preferably a nonwoven fabric made of polyolefin fibers. If these are listed, ethylene,
It is a polyolefin resin whose main component is a monoolefin polymer such as propylene or butene and a copolymer thereof. The fibers constituting these nonwoven fabrics may be a single component or a mixed component. For example, it may be a composite fiber obtained by mixing polyethylene / polypropylene or the like, or may be a composite product in a single fiber, that is, a sheath-core fiber or a side-by-side fiber. In this sense, in the case of the sheath-core type composite fiber, the material of the surface corresponding to the food, that is, the material of the sheath may be a polyolefin, and the material entering the core is not particularly limited. Examples of this include fibers whose sheath / core is polypropylene / polyester, polyethylene / polyester, or the like.

Wrapping materials such as bread, hamburgers, rice, etc., as food packaging materials, are all composed of highly hydrophilic components such as starch and cellulosic materials. For the purpose of peeling, a water repellent treatment of paraffin or silicon has been performed. In this sense, when food such as bread and hamburgers are heated in a microwave oven, if a nonwoven fabric made of a material with low hydrophilicity made of olefin-based fibers is used, the food does not stick to the inner layer sheet and the peelability is good, It is easier to remove food from the package. In the present invention, it is also possible to apply a water-repellent agent to the surface of the nonwoven fabric in order to further increase the water repellency or reduce the hydrophilicity. It is not desirable in view of the fact that it sometimes desorbs, adsorbs on food, and may enter the human body. Even considering these, the surface material of the food packaging material amount is preferably substantially composed of a polyolefin-based polymer.

From the viewpoint of workability, the polyolefin material also has good secondary workability during use, such as heat sealability and bag making. Furthermore, when considering microwave compatibility, even when considering the low dielectric constant and low dielectric loss properties of polyolefin resin compared to other polymers, the energy of microwave heating can be effectively applied to food. It can be transmitted and warmed efficiently. As described above, the polyolefin material is optimal in terms of processability and microwave oven suitability.

In the present invention, the basis weight of the inner layer sheet is preferably 5 g / m ² or more and 100 g / m ² or less.
If the basis weight is too small, the thickness becomes thin, the ability to retain dew water generated during heating in a microwave oven is low, and the lower part of the food may become sticky due to the return of moisture. On the other hand, if the basis weight is too large, the thickness becomes large and the bag-making processability deteriorates. In this sense, the more preferable weight of the inner layer sheet is 15 g / m ² or more and 50 g / m ² or less.

The function required for the inner layer sheet in contact with the food used in the present invention is to keep excess moisture and the like generated from the food in the voids and minimize the return of excess dew water to the food. That is. On the other hand, the preferred inner layer sheet of the present invention is described as a polyolefin-based nonwoven fabric being good, but in this sense, these water-repellent materials, polyolefins, should be used in order to make more effective use as a food packaging material. The bulk density and the basis weight of the nonwoven fabric used as the sheet and the fiber diameter of the nonwoven fabric used as the inner layer sheet are important.

A preferable characteristic of the nonwoven fabric for the inner layer sheet of the present invention is that the nonwoven fabric has an appropriate fiber diameter so that excess moisture and the like can be quickly passed. In this sense, the fineness of the fibers constituting the nonwoven fabric of the present invention is preferably 0.1 denier or more and 50 denier or less, more preferably 0.5 denier or less.
It is not less than denier and not more than 20 denier. If the fineness is too small, the nonwoven fabric is densified, and the ability to retain excess moisture generated from the food is reduced, which causes the moisture to return to the wet state. Further, even from the viewpoint of the food material, the contact area with the nonwoven fabric as the inner layer sheet increases, and the food material easily sticks to the inner layer sheet. Further, the strength of the nonwoven fabric is insufficient, and the sheet is broken by friction or the like, or the fibers are cut off and fall off, resulting in contamination of foodstuffs.
On the other hand, if the fineness is too large, the production of the nonwoven fabric becomes substantially difficult.

The bulk density of the nonwoven fabric used as the inner layer sheet of the present invention is preferably 0.01 g / cm ³ or more and 0.3 g / cm ³ or less. In order to quickly transfer excess oil and water from the food to the water-absorbing layer, the bulk density is preferably in the above range, more preferably 0.05 g / cm ³ or more,
0.2 g / cm ³ or less is good. If the bulk density is too large,
The bulkiness between the fibers of the non-woven fabric is lost, and it becomes difficult to quickly pass excess moisture and oil. In this sense, it is preferable that the bulk density is small, but if it is too small, the production of the nonwoven fabric becomes substantially difficult.

As the nonwoven fabric for the inner layer sheet of the present invention, any nonwoven fabric produced by a short fiber nonwoven fabric production method such as a card method or a papermaking method or a long fiber nonwoven fabric production method such as a spun bond method can be used. In addition, as a bonding method of the nonwoven fabric, bonding with an adhesive, ultrasonic welding, partial hot air bonding,
A method such as needle punch bonding can be used. However, for food applications, the method of partial thermocompression bonding is most preferable in terms of abrasion strength, generation of dirt and lint hardly, and lack of extra connecting resin or glue.

The fibers forming the non-woven fabric for the inner layer of the present invention may be either long fibers or short fibers, but foreign matter is mixed into food due to falling off of short fibers, sheet strength and abrasion durability. In view of this, long fibers are more preferable.

In view of the above, the method for producing the nonwoven fabric used as the inner layer sheet used in the present invention has a good abrasion resistance, and considering that it is difficult to transfer lint and the like to food, a long fiber A type of spunbond nonwoven is a more preferred embodiment. In this sense, a composite nonwoven fabric such as SMS using a spunbonded nonwoven fabric can also be used.

The fibers forming the nonwoven fabric for the inner layer in the present invention may be not only round cross-sections but also flat or C-shaped or other irregularly shaped yarns, and crimped fibers may be used. . In consideration of the purpose of physically exposing the layer absorbing the dew condensation water and the food, it is a preferable embodiment to use a deformed yarn or a crimp yarn for the inner layer sheet.

The water absorbing sheet 1A used in the present invention (FIG. 2)
Any material may be used as long as it has water absorbency, such as paper, a nonwoven fabric made of natural fibers or synthetic fibers, a sponge, or the like. However, paper made of pulp and nonwoven fabric made of cellulose fiber such as rayon are preferable in terms of water absorption, handleability, and price. The basis weight of the water-absorbing sheet in the present invention is preferably 8 g / m ² or more and 50 g / m ² or less. More preferably 15 g / m ² or more, 40 g / m ²
m ² or less is good. If the basis weight is too small, the amount of water vapor generated from the food is absorbed little, and excess water vapor is condensed and may accumulate at the lower portion of the sheet and become sticky. On the other hand, if the basis weight is too thick, the workability may be deteriorated when the sheet is processed into a sheet shape, and thereafter, when the sheet is processed into a bag or a container. That is, as the thickness increases, the thermal conductivity deteriorates, and it becomes difficult to bond with heat during processing.

When a water-absorbent sheet is used in the present invention, it is more preferable that the inner layer sheet (B) 2 which is in contact with food has good liquid permeability as well as liquid absorbability. The inner layer sheet allows the passage of water vapor or drip generated from the food, and prevents direct contact between the water absorbent sheet 1A absorbing the water vapor and the drip water and the food. Therefore, when using a water-absorbent sheet, the basis weight of the inner layer sheet,
5 g / m ² or more fully demonstrates its function. As the water permeability, it is sufficient that the dew condensation water can be transferred depending on the use conditions as described above.
mm or less, more preferably 150 mm or less, and in this sense, the basis weight of the inner layer sheet is more preferably 50 g / m ² or less.

In the present invention, the use ratio of the inner layer sheet 2 to the outer layer sheet 1 is 40% or more and 100% or less in a food package in which the inner layer sheet is arranged at the bottom of the food to be packaged. More preferably, there is. The bottom of food refers to the part where the bottom of the food comes in contact with the sheet when the food package containing hamburgers and the like is reheated with a microwave, but the bottom of the bag is used when reheating with a microwave. In addition, it corresponds to a portion where dew condensation water is most likely to be generated and a chance to come into contact with food is increased. Generally, when these products are sold, the bottom of the bag can be determined based on the printing method and appearance, and those skilled in the art can appropriately select and determine the bottom. The use ratio of the inner layer sheet is preferably 40% or more and 100% or less as an area with respect to the outer layer sheet.
If the use ratio of the inner layer sheet is too small, the portion holding the dewed water becomes small, and the dewed water returns to the food, which may impair the texture. In this sense, the use ratio of the inner layer sheet over the entire area with respect to the outer layer sheet is more preferable for the purpose of retaining dew water, but it is possible to detect food from outside as a packaging bag, In order to enhance the performance, the outer layer sheet need not necessarily be provided on the entire surface. The use area ratio of the inner layer sheet can be appropriately determined based on the appearance of the content food and the food.

In the present invention, the outer layer sheet (A) and the inner layer (B)
The method of integrating and / or bonding the water-absorbent sheet (D) is extrusion lamination of resin, heat bonding,
Lamination by an adhesive using a hot melt resin, a solvent, or the like, a method of physically sewing, and the like can be appropriately selected. A more preferred embodiment is adhesion by heat because it does not require any extra material such as an adhesive and has good productivity. Examples include a method of laminating an outer layer sheet such as a film or paper and an inner layer sheet as it is, or a method of laminating an outer layer sheet and an inner layer sheet with an extruded resin such as polyethylene or polypropylene interposed therebetween. . At this time, a more preferable embodiment is a method in which a paper such as a polyolefin is previously thinly coated with a paper as an outer layer for the purpose of heat sealing by heat. Further, in the present invention, the area where the outer layer sheet and the inner layer sheet and / or the water-absorbent sheet are bonded may be whole or partial. In a preferred embodiment, the bonding area is as small as possible for the purpose of retaining dew water from food.

In the present invention, the opening means (C) 3 may be any opening means as long as the whole can be easily opened, and examples thereof include a tape-like material and a cord-like material. In order to provide such opening means, these opening means may be attached to the opening of the food package.

The form of the tape for opening may be any form such as a sheet, a tape, a string or the like. Further, the material may be any material having a strength higher than the tear strength of the material constituting the bag. For example, a synthetic resin tape, that is, a tape such as polyethylene, polypropylene, or polyester, may be used. The width of the tape is preferably 15 mm or less, and more preferably 5 mm or less.

In the present invention, it is preferable to attach an opening tape or the like to the outer layer sheet or the like. That is, the opening tape can be mounted on a sheet serving as a bag, which is a package, by heat sealing or by pasting a tape which has been previously made tacky. Further, the opening tape or the like may be formed over the entire length in the bag-like length direction or may be partially inserted.

FIG. 1 shows a method of attaching the opening means to the bag.
Then, the outer layer sheet (A) 1 and the inner layer sheet (B) 2 are bonded together to form a cylindrical shape by bonding the end portions 11 of the partially integrated sheet, and the opening tape 5 is parallel to the longitudinal direction. It is stuck on the outer layer sheet 1. This opening tape 5
May be bonded on the outer layer sheet alone or on a sheet in which the outer layer sheet and the inner layer sheet are combined. However, if the outer layer sheet is bonded on a portion that becomes the only outer layer sheet, the opening becomes more reliable. Next, the tubular sheet is heat-sealed in a direction perpendicular to the longitudinal direction of the sheet, and one side of the tubular sheet serving as a bag is sealed. Then heat seal part 4
Cut the tubular sheet at the rear side in the machine direction, and insert the cuts 8 on both sides of the opening tape 5 with the opening tape 5 sandwiched at the center from the cutting section 9 to the heat sealing section 4. , Create gripping part 9 and open means (C)
3 is formed. The vertical / horizontal size of the grip portion 9 may be appropriately selected. The tubular sheet is cut into a predetermined length of the bag, and an opening 12 of the bag is formed.

The bag-like material shown in FIG.
And the inner layer sheet (B) 2 are overlapped and the partially integrated sheet is bonded by fusing or the like to form a heat-sealed portion 4 and cut to form an opening 12 for food on one side. The opening means 3 is provided on the opposite side and in a direction perpendicular to the direction of inserting the food. At this time, the opening tape may be bonded to the outer layer sheet alone, or may be bonded to a composite sheet of the outer layer sheet and the inner layer sheet. However, preferably, if it is bonded to the portion that becomes the outer layer sheet alone,
Opening is more secure. An enlarged view of the opening means (C) 3 is shown in FIG. This bag-shaped material is provided with opening means in a direction orthogonal to the direction of inserting the food, and a bonding portion formed when the opening of the package is sealed is located on the path of the opening means. Since there is no opening means, the opening means is cut off in the middle, so that it does not take time to open.

In a preferred embodiment of the present invention, the outer layer sheet 1 is preferably made of a transparent stretched film parallel to the flow direction of the tubular sheet. That is, the stretched film is easily torn in the stretching direction, but hard to tear in the direction perpendicular to the stretching direction. Therefore, when the stretched film is used in the flow direction of the tubular article to be a bag, it can be more easily opened. .

The package of the present invention can be provided with a window so as to detect, for example, a packaged object which is food inside. The window portion includes, for example, a band-shaped window, a circular or square window opened in the center of a sheet, a window in which an inner layer sheet is not partially used, and a transparent portion is provided on the entire surface of another bag. Further, in a bag-like form, it is more preferable to provide a fine hole or the like for letting out excess steam to the outside, or to provide a form having a fastener or the like in order to improve sealing performance.

In the package obtained in this manner, a food material such as a hamburger is inserted from the opening on the opposite side of the heat-sealed portion, and the opening is heat-sealed and sealed, or the entire opening is placed along the food. The whole food can be enclosed by folding back and bonding the outer layer sheet of the package on the back side with an adhesive sheet or the like.

To open the food package 10 of the present invention,
After reheating of the microwave oven or the like, the gripper 9 of the opening means (C) 3 is gripped by hand and pulled, and each packaging sheet on the extension of the gripper is torn along the opening tape 5 and torn. Is separated and removed from other parts. In this way, by removing or bending the portion of each packaging sheet positioned along the path of the grip portion 9, a part of the food such as a hamburger can be exposed outside the bag and eaten. . In this way, by easily opening the bag and holding the part that has been previously bagged by hand, the food can be eaten hygienically without directly holding it by hand. In this case, it is more preferable to design the inner layer sheet 2 so as to come into contact with the hand, since the hand does not become hot even if heated too much after the microwave oven.

[0046]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to examples.

EXAMPLE 1 A stretched polypropylene film (OPP film, thickness 25 μm) was used as an outer layer sheet, and a spunbond nonwoven fabric (basis weight: 20 g / m ² , bulk density: 0.12 g / cm ³ ) was used as an inner layer sheet. To form a packaging sheet for food reheating. At this time, the inner layer sheet was 60% of the length in the width direction of the outer layer film, the bonding area was 10% of the total area, and a diamond-shaped partial lamination method was adopted. An opening tape with an acrylic adhesive is attached to the side of the inner layer where the inner layer sheet is not attached in parallel with the flow direction of the lami sheet, and the surface with the inner layer sheet is bent inward and folded into a gusset shape. Then, both ends of the outer layer film were fusion-bonded so as to be at the lower center side to form a cylindrical shape. Thereafter, the end of the tubular material is further sealed by heat (about 10 mm), and then the tubular sheet is cut at a position 1 cm rearward in the machine direction from the heat-sealed portion, and opened from the cut surface to the heat-sealed surface. With the tape sandwiched in the center, cuts were made on both sides of the opening tape to create a gripping portion, which was used as a food packaging bag. The material of the opening tape was a PP film of 30 μm and a width of 5 mm. The size of the food packaging bag is 21cm long and 11c wide
m, the width of the gusset part was a rectangular type of 3 cm. Thereafter, a commercially available hamburger was put in, the opening was bent by 3 cm, a part of the bent portion was closed with cellophane tape, heated in a microwave oven, and the taste and openability were evaluated by the following methods. The evaluation results are shown in Tables 1 and 2.

[0047]

[Table 1]

[0048]

[Table 2]

[0049]

Example 2 Pure white paper (basis weight 40 g / m2) was used as the outer layer sheet.
² ) and a spunbond nonwoven fabric made of polypropylene (basis weight: 20 g / m ² , bulk density: 0.2 g / m ² ) as an inner layer sheet.
084 g / cm ³ ), laminated and integrated by extrusion lamination,
A packaging sheet for food reheating was used. At this time, the resin for extrusion lamination was modified polypropylene and the thickness was 15 μm.
The bonding area was 50% of the total area, and a lattice-shaped partial lamination method was adopted. A laminating tape with an acrylic adhesive is attached to the polypropylene non-woven fabric side in parallel with the flow direction of the laminating sheet. The antifogging film was made to fit with both side edges of a 20 μm sheet, and was folded on a gusset, and these were fused to form a cylindrical shape. At this time, the use ratio of the inner layer sheet was set to 50% in area ratio with respect to the outer layer sheet. Thereafter, the end of the cylindrical object is further sealed with heat (about 5 mm).
mm), and then cut the tubular sheet at a position 1 cm behind the heat-sealed portion in the continuous machine direction, and cut the opening tape from the cut surface to the heat-sealed surface with the opening tape sandwiched in the center, on both sides of the opening tape. Put it in, make a grip, and make it a food packaging bag. The material of the opening tape is PE
A T film of 50 μm and a width of 5 mm were used. The size of the food packaging bag was 21 cm in length, 11 cm in width, the length of the gusset part was 3 cm, and the transparent window part was 5 cm. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. Table 1 shows the evaluation results.
And Table 2.

[0050]

Example 3 Pure white paper (basis weight 40 g / m2) as an exterior sheet
² ) and pulp paper (basis weight 18 g)
/ M ² ) was entirely integrated by extrusion lamination.
At this time, the resin for the extrusion lamination was modified polypropylene, and the thickness was 15 μm. Next, a spunbond nonwoven fabric made of polypropylene (basis weight 14 g /
m ² and a bulk density of 0.12 g / cm ³ ) were partially heat-sealed to the pulp layer side of the laminated sheet prepared above to obtain a laminated sheet. At this time, the bonding area is 25% of the total area
Therefore, a lattice-like partial lamination method was adopted. The laminating sheet is bent with the inner layer side facing inward, and a polypropylene antifogging film 20 μm in which an opening tape with an acrylic pressure-sensitive adhesive is attached is fitted to both side edges of the sheet, and folded in a gusset shape. These were fused and formed into a cylindrical shape. Thereafter, a food packaging bag was prepared in the same manner as in Example 2. At this time, the use ratio of the inner layer sheet was 30% in area with respect to the outer layer sheet. The material of the opening tape was a PP film of 50 μm and a width of 5 mm. The size of the food packaging bag was 21 cm in length, 11 cm in width, the width of the gusset part was 3 cm, and the transparent window made of a polypropylene anti-fog film was 5 cm. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. Table 1 and Table 2 show the evaluation results.
Shown in

[0051]

EXAMPLE 4 A stretched polypropylene film (OPP film, thickness: 40 μm) was used as an outer layer sheet, and a spunbond nonwoven fabric (basis weight: 20 g / m ² , bulk density: 0.12 g / cm ³ ) was used as an inner layer sheet. To form a packaging sheet for food reheating. At this time, the inner layer sheet was bonded to the entire length of the outer layer film in the width direction, and the bonding area was 10% of the entire area, and a rhombic partial lamination method was adopted.

The laminating sheet and a stretched polypropylene film (an anti-fog film OPP film, thickness: 20 μm) in which an opening tape with an acrylic pressure-sensitive adhesive is bonded in parallel to the flow direction are superposed on the opening tape. A bag-like article (see FIG. 4) in which the superposed sheets are stuck together by fusing and cut to form an opening for inserting the food on one side and provided with opening means in a direction perpendicular to the direction of inserting the food. Bag-like material). At this time, the use ratio of the inner layer sheet was set to 50% of the area ratio with respect to the outer layer sheet.
The material of the opening tape is PP film 25 μm, width 5
mm was used. The size of the food packaging bag was a semicircular bag shown in FIG. 4 having an opening length of 10 cm and a depth of 21 cm. In addition, cuts were made on both sides of the opening tape from the cut surface to the heat-sealing surface with the opening tape sandwiched at the center, thereby forming a square grip portion having a width of 10 mm and a length of 10 mm. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0053]

Example 5 A spunbond nonwoven fabric made of polyester (basis weight: 20 g / m ² , bulk density: 0.21
g / cm ³ ), and the other conditions were the same as in Example 4 to prepare a food packaging bag. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0054]

Example 6 A food packaging bag was prepared in the same manner as in Example 4 except that a water-absorbing paper (trade name: New Soflon FX, manufactured by Unicharm Co., Ltd., basis weight: 22 g / m ² ) was used as the inner layer sheet. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0055]

Example 7 The use ratio of the inner layer sheet to the outer layer sheet was 20% in area, and a food packaging bag having the same shape as in Example 1 was obtained. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0056]

Comparative Example 1 A food packaging bag having the same shape as that of Example 1 was obtained by using a stretched polypropylene film (OPP film, thickness: 40 μm) without using an inner layer sheet. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0057]

Comparative Example 2 The same material sheet as in Example 1 was used, and a cutout having a length of 10 mm was provided in the rear part of the heat seal in place of the opening means. I got a packaging bag. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0058]

Comparative Example 3 A food packaging bag having the same shape as that of Example 4 was obtained by using a stretched polypropylene film (OPP film, thickness of 40 μm) without using an inner layer sheet. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

[0059]

Comparative Example 4 The same material sheet as in Example 4 was used, and a notch having a length of 10 mm was provided at the rear portion of the heat seal instead of the opening means, and the same shape as in Example 1 was used instead of the opening means. I got a packaging bag. Thereafter, a product was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

Using the nonwoven fabric obtained as described above, evaluation was made by the following method. (1) Hamburger test using microwave oven The products prepared in the examples and comparative examples were irradiated with a microwave oven of 600 watts for 30 seconds. Thereafter, the package was opened, and the ease of opening and the taste were determined. Opening judgment and taste judgment were evaluated in the following four stages. These were performed at five points per sample, and the results are summarized in Table 1.

[0061]

<Evaluation of Taste> Judgment Criteria A: The water content was moderate and the taste was very delicious. ：: The bottom of the bread was slightly wet, but delicious. Δ: Moisture gathered at the bottom of the bread and was slightly unsatisfactory. X: Moisture gathered at the bottom of the bread and became crunchy and not delicious.

[0063]

(2) Drip water re-wetting and moisture retention test in nonwoven fabric A quarter of a commercially available hamburger (about 50 g) was placed in a 300 cc beaker, and the mouth of the beaker (pore area 50 c
m ² ), the samples used in the examples and comparative examples (laminated sheet: 14 cm × 14 cm, the bag was dismantled and used as an evaluation sheet) were placed, and the mouth was closed with a rubber band. Thereafter, irradiation is performed for 2 minutes in a microwave oven of 600 watts. The sample is taken out of the microwave oven into a room of constant temperature and humidity (20 ° C., 65% rh), the sheet is removed after 5 minutes and 20 minutes, and the weight is measured with a balance. Then, a filter paper (basis weight 120 g / m ^2, size 15 cm × 15 cm) is placed on the sample, and a glass plate and a weight (1 kg) are placed thereon.
After a lapse of 10 seconds, the weights of the filter paper and the sample were measured, and the following items were obtained. The measurement was performed five times for each sample, the average was obtained, and the results were summarized in Table 2. The calculation method is as follows.

Amount of adsorbed steam generated: A W0: Weight of sample before irradiation with microwave oven (mg) W1: Weight of sample after irradiation of microwave oven (mg) Amount of adsorbed steam generated: A (mg) = W1-W0 Wet return rate: B R0: Initial weight of filter paper R1: Weight of filter paper 10 seconds after the sample and filter paper were overlaid Wet return amount: B1 (mg) = R1-R0 Wet return rate: B2 (%) = ｛( R1-R0) / A｝ ×
100 Water retention amount of sample: C W0: Weight of sample before irradiation with microwave oven W3: Weight of sample 10 seconds after overlapping sample and filter paper Water retention amount of sample: C1 (mg) = W3-W0 Water retention ratio of sample: C2 (%) = {(W3-W0) / A}
× 100

[0066]

According to the package for electromagnetic heating of the present invention, when the food such as a hamburger is reheated in a microwave oven or the like, excess drip water is prevented from returning to the food, and the food is deliciously re-cooked. The food can be stored hygienically, and the package can be opened reliably and quickly when eating, so that the food can be eaten hygienically.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a rectangular microwave bag of the present invention.

FIG. 2 is an explanatory view of a rectangular microwave oven bag having a water absorbent sheet according to the present invention.

FIG. 3 is an explanatory view of a round-shaped easily opened microwave oven bag of the present invention.

FIG. 4 is an enlarged explanatory view of a means for opening a bag for a microwave oven.

FIG. 5 is an enlarged explanatory view of an opening means of the microwave oven bag of FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Outer layer sheet, 2 ... Inner layer sheet, 3 ... Opening means, 4 ...
Heat seal portion, 5: tape for opening, 1A: water-absorbent sheet, 7: transparent film, 8: cut, 9: gripping portion, 1
0: microwave oven bag.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Rumina Obi 11-7 Hatchowate-cho, Takatsuki-shi, Osaka Asahi Kasei Corporation (72) Inventor Naoto Shirai 4-7-8 Narashino, Funabashi-shi, Chiba F-term in Sangyo Co., Ltd. (reference) 3E067 AA11 AB01 BA12A BB06A BB15A BB16A BB25A CA09 CA24 EA06 EB08 FA01 FC01 GA30 GB09 GD10 4B055 AA10 AA17 BA37 BA54 CB16 CC43 CC52 FA01 FB35 FC13

Claims (6)

[Claims] 1. A package of an article composed of at least an outer layer sheet (A) and a liquid-absorbing inner layer sheet (B), wherein at least a part of the sheet forming the package has an opening means (C). A package for electromagnetic heating, comprising: 2. The unsealing means (C) attaches a tape-like material or a thread-like material to the outer layer sheet (A) or a sheet integrated therewith in a direction parallel to or perpendicular to the insertion direction of the article. The electromagnetic heating package according to claim 1, wherein a grip portion is provided at one end, and the tape-like material or the thread-like material is peeled off from the package with the sheet by pulling the grip portion, and the package is opened. body. 3. The electromagnetic heating according to claim 1, wherein a water-absorbing sheet (D) is arranged between the outer layer sheet (A) and the liquid-absorbing inner layer sheet (B). Packaging. 4. The electromagnetic heating package according to claim 1, wherein the inner layer sheet (B) is made of a nonwoven fabric composed of polyolefin fibers. 5. The use ratio of the inner layer sheet (B) to the outer layer sheet (A) is 40% or more and 100% or less in area ratio,
The electromagnetic heating package according to any one of claims 1 to 4, wherein an inner layer sheet is disposed at a bottom of the package, and an opening means is provided on an outer layer sheet having no interior sheet. 6. The package for electromagnetic heating according to claim 1, wherein the outer layer sheet (A) is made of a transparent resin film.