JP2005224381A - Steam permeable label and microwave processing package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam permeable label for preventing a sealing film from weakening in a wide range in forming a vent hole by fusing part of the sealing film at the time of microwave irradiation, by using a label with a conductor layer in which a slit is formed. <P>SOLUTION: The steam permeable label is pasted to the sealing film 3 of a microwave processing package in which a stored object 20 is sealed off with the sealing film 3 via a pasting part 10 made of an adhesive, etc. to be used for forming a vent hole in part of the sealing film 3 by the microwave irradiation. The steam permeable label has a label base material 6 with the conductor layer 7, and the slit 9 is formed on the conductor layer 7. The pasting part 10 is disposed in a region corresponding to the slit 9 on the rear surface of the label base material 6, and a non-pasting part 11 is provided around the pasting part 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is for steaming used for forming a vent hole by microwave irradiation in a sealing film of a microwave processing package in which the contents are hermetically sealed with a sealing film, and releasing water vapor generated from the contents. The present invention relates to a label and a package for microwave processing.

  Conventionally, a technique described in Japanese Patent Publication No. 6-67341 is known as a technique for forming a hole for steaming in a lid of a sealed container by generating heat with a microwave irradiation. This publication discloses a sealed container for cooking a microwave oven in which a lid for a container containing food is provided with a C-shaped antenna made of a conductor and a heating element made of a high resistance at the end of the antenna. By exposing such a sealed container to microwaves, microwave energy is collected by the antenna to generate heat from the heating element, thereby melting a part of the lid material to form a vent hole and containing foodstuffs, etc. It is possible to automatically release water vapor generated from the outside.

  However, the technique described in the above Japanese Patent Publication No. 6-67341 cannot be easily manufactured because the heating element must be disposed at a predetermined position with respect to the antenna. In addition, since the antenna and the heating element are directly provided on the lid member, it cannot be applied to a sealed container manufactured by equipment without an antenna or the like, and is used for steaming to a desired position of the lid member without directly providing an antenna or the like. There is a need for a means that can form the holes.

Therefore, as shown in FIG. 10, a label base material 102 on which a conductor layer 101 is laminated by metal deposition or the like, and an adhesive layer formed by applying an adhesive or the like to the back surface of the label base material 102 It has been studied that a label 105 including 103 and a slit 104 having a desired shape formed in the conductor layer 101 is pasted on a sealing film 106 such as a lid material via the adhesive layer 103. When the sealed container with the label 105 attached thereto is exposed to microwaves, the current generated in the conductor layer 101 collects in the slit portion 104 to generate sparks and the like, whereby the lid member 106 is heated and substantially the same shape as the slit portion 104. A cut is automatically formed, and water vapor can be released to the outside through this cut. Such a label 105 can be produced by, for example, cutting the label base material 102 on which the conductor layer 101 is laminated to form the slit portion 104. Therefore, the label 105 can be produced relatively easily, and the adhesive layer 103 such as an adhesive can be formed. Since it is a label aspect provided, it can be applied in a desired position on the lid. Furthermore, since a slit having substantially the same shape as the slit portion 104 is formed in the lid member 106, for example, if the slit portion 104 is formed in a substantially X-shaped plane, a substantially X-shaped slit may be formed in the lid member 106. Since it can do, it has the outstanding effect that it can utilize as an opening starting point at the time of opening and removing the cover material 106.
However, when the above-mentioned label 105 was further studied, a slit having substantially the same shape as the slit portion 104 was not formed on the lid material 106 depending on the thickness of the lid material, the microwave irradiation time, or the like. There is a problem that the lid member 106 melts in the range where the 105 is adhered, and as a result, a relatively large hole is opened or the lid member 106 becomes weak in a wide range.

Japanese Patent Publication No. 6-67341

  The present invention uses a label including a conductor layer having slits formed thereon, and has improved the sealing film so that it does not weaken extensively when a vent is formed in a part of the sealing film during microwave irradiation. It is an object to provide a label for steaming and a package for microwave processing.

Therefore, the present inventors have studied the above problems, and when almost the entire surface of the label is adhered to the sealing film, when the sealing film is heated by a spark or the like generated from the slit portion, the adhesive or the like The present invention was completed by ascertaining that the cause was that heat propagated through the adhering part of the film and spread to a sealing film over a wide range.
The present invention is affixed to a sealing film of a microwave processing package, in which the contents are sealed with a sealing film, through an adhesive part made of an adhesive or the like, and is passed through a part of the sealing film by microwave irradiation. A steaming label used for forming pores, comprising a label base material having a conductor layer, wherein a slit portion is formed in the conductor layer, and a slit portion is formed on the back surface of the label base material. The sticking part is provided in the area | region corresponding to, and the non-sticking part is provided around this sticking part, It is characterized by the above-mentioned.

  The label for vapor transmission is provided with a sticking part in a region corresponding to the slit part, and a non-sticking part is provided around this, so when the label is stuck on the sealing film, An adhesive or the like is interposed between the back surface of the label base material and the sealing film in the corresponding region, while the adhesive material is interposed between the back surface of the label base material and the sealing film around the corresponding region. Etc. do not intervene. Therefore, when the sealing film is heated by a spark or the like generated in the slit portion, the heat does not spread over a wide range via the adhesive, and only the limited portion of the sealing film facing the corresponding region of the slit portion is concentrated. Heating, so that the vent can be formed quickly.

Furthermore, the present invention is affixed to a sealing film of a microwave processing package in which the contents are sealed with a sealing film through an adhesive part made of an adhesive, etc., and a part of the sealing film is irradiated by microwave irradiation. A label for vapor transmission used to form a vent hole in a container, comprising a label base material having a conductor layer, wherein a slit portion is formed in the conductor layer, and a slit portion is formed in the conductor layer. And the sticking part is provided in an elongated shape along the slit part.
Since the label for vapor transmission is provided with a sticking part in an elongated shape along the slit part on the back surface of the label provided with the conductor layer in which the slit part is formed, it is as if the slit part is a sealing film. The label can be attached to the sealing film as if it were transferred. Therefore, when the sealing film is heated by a spark or the like generated in the slit portion, the heat does not spread over a wide range via the adhesive or the like, and a cut having approximately the same shape as the slit portion is surely formed in the sealing film. Can do. Therefore, by forming the shape of the slit portion into a substantially cross shape, for example, the cut can be used as an opening start point for opening and removing the sealing film, and it is used as an opening label also serving as a steaming function. You can also.

The second means of the present invention resides in a microwave processing package, and a label for steaming which can form a vent hole by melting a part of the sealing film by microwave irradiation to the sealing film for sealing the contents. Is attached to the microwave processing package, the steaming label has a conductor layer in which a slit portion is formed, and a region corresponding to the slit portion of the back surface of the label is defined, This portion is adhered to a sealing film.
In the microwave processing package, a region corresponding to the slit portion is defined on the back surface of the label having the slit portion formed in the conductor layer, and this portion is adhered to the sealing film. When the sealing film is heated by the generated spark or the like, only the limited portion of the sealing film facing the corresponding region of the slit portion is intensively heated, so that the air holes can be formed quickly.

The label for vapor transmission of the present invention can be produced relatively easily, and since it is in the form of a label, it can be appropriately affixed to a desired position of the sealing film of the microwave processing package. Furthermore, since the sticking part is provided in an area corresponding to the slit part, and the periphery thereof is a non-sticking part, the sealing film is not melted extensively at the time of microwave irradiation. Pore can be formed. Therefore, water vapor generated by microwave heating can be deaerated to prevent the inside of the container from becoming a high pressure.
Furthermore, the label for steaming of the present invention in which the sticking part made of an adhesive or the like is provided in an elongated shape along the slit part surely forms a cut substantially the same shape as the slit part at the time of microwave irradiation. be able to. Accordingly, it is possible to prevent an increase in the internal pressure of the container, and it is also possible to easily open and remove the sealing film using the cut after the microwave treatment.
Further, the microwave processing package of the present invention can form air holes in the sealing film without thermally melting the sealing film over a wide range during microwave irradiation. Therefore, water vapor generated by microwave heating can be deaerated to prevent the inside of the container from becoming a high pressure.

Hereinafter, the present invention will be specifically described with reference to the drawings.
1 and 2, reference numeral 1 is a package formed by hermetically wrapping an opening of a container 2 containing a container 20 such as a microwave-cooked food with a lid film 3 (corresponding to a sealing film). The microwave processing packaging body which consists of the body 4 and the label 5 for steaming stuck to a part of surface of the cover film 3 of this packaging body 4 is shown.
The package 4 is not particularly limited as long as the lid film 3 can be melted by heat, and is a publicly known package in which a microwave-cooked food or the like is hermetically packaged. For example, on the flange portion of the heat-resistant container 2, What sealed the cover film 3 which consists of a gas-barrier thermoplastic resin film etc. are mentioned.

The label for steaming 5 is a label base comprising a base material 6 composed of two layers of a decorative film 61 and a base film 62 and a conductor layer 7 laminated on the back surface of the base material 6 and having a slit 9 formed therein. It is comprised from the material 8 and the adhesion part 10 which consists of an adhesive etc. provided in the area | region corresponding to the slit part 9 of the back surface (back surface of the conductor layer 7) of this label base material 8.
Specifically, the slit portion 9 only needs to be formed in at least the conductor layer 7. For example, if the label 5 is cut with a cutter or the like over the entire layer in the thickness direction, the slit portion 9 is formed in the conductor layer 7. It can be formed easily. In this case, as shown in FIG. 2, the same cut as the slit portion 9 is formed from the uppermost decorative film 61 to the back surface of the lowermost sticking portion 8. Here, the planar shape of the slit portion 9 is not limited to the substantially X shape illustrated in FIG. 2, and for example, as illustrated in FIGS. 3A to 3D, a linear shape, a substantially V shape, and a substantially U shape. A shape composed of a single straight line or a non-straight line, such as a shape, or a plurality of straight crossing or non-linear crossing shapes such as a substantially cross shape, or a line such as a substantially V-shape, as shown in FIGS. Examples include a plurality of shapes. However, since it is possible to form a slit in the lid film 3 that is substantially the same shape as the planar shape of the slit portion 9 during microwave irradiation, the preferred slit portion 9 has a shape desired to be formed in the lid film 3. Decided in consideration. For example, when it is desired to form a knob on the lid film 3 by microwave irradiation, for example, the slit portions 9 as shown in (c) to (g) may be formed. Among these, a substantially X shape as shown in FIG. 2 or a substantially cross shape as shown in FIG. Moreover, it is preferable to form the slit part 9 in the center part of the conductor layer 7 rather than the position biased to the end part side of the conductor layer 7.
The interval W between the slit portions 9 (the gap between the slit portion end faces 7a and 7a of the conductor layer 7) is 1.0 mm or less, preferably 0.5 mm or less, more preferably 0.2 mm or less, as shown in FIG. Yes, the end faces 7a, 7a may be substantially in contact with each other (the slit portion 9 has substantially no gap). In addition, what is necessary is just to design the length of the slit part 9 suitably, for example, what is necessary is just to form in about 5-30 mm.

Next, the sticking part 10 is a part that can be adhered to the lid film 3, and in order to apply heat to a limited range of the lid film 3 during microwave irradiation, It is provided in a region corresponding to the slit portion 9 formed in the conductor layer 7. On the other hand, the non-sticking part 11 which cannot be adhere | attached on the cover film 3 is ensured around the corresponding | compatible area | region of the slit part 9 among the back surfaces of the label base material 8. FIG. Specifically, as shown in FIG. 2, the adhering portion 10 is provided in a range that is elongated along the slit portion 9 so as to overlap the entire slit portion 9, and the periphery thereof is a non-adhering portion. 11.
Here, the sticking part 10 provided in the area | region corresponding to the slit part 9 is not restricted to what is shown in FIG. 2, For example, as shown to Fig.4 (a), the slit part 9 except a longitudinal direction both ends. 4 (b) and (c), as shown in FIGS. 4 (b) and 4 (c), in a range that is intermittently elongated along the shape of the slit portion 9. As shown in FIGS. 3D and 3E, examples are provided, and those provided in a partially partitioned range so as to overlap a part of the slit portion 9 are exemplified. Any of these can form a cut (vent hole) by thermally melting a limited part of the lid film 3 with a spark or the like generated in the slit portion 9 during microwave irradiation. Since it can be surely formed in the lid film 3 with a cut having substantially the same shape as that, it is preferable to be provided in a range defined in an elongated shape (including an intermittent elongated shape) along the shape of the slit portion 9. . Moreover, the sticking part 10 is preferably provided so that the slit part 9 substantially coincides with the center line in the width direction. 4 illustrates a label on which one straight or substantially X-shaped slit portion 9 is formed. However, even when the slit portion 9 has a shape as shown in FIG. What is necessary is just to provide in the same way.

The width of the sticking part 10 is preferably as narrow as possible in order to reduce the spread range of heat propagation. However, if it is too narrow, there is a risk that it will inadvertently separate from the lid film 3, for example, about 3 to 10 mm. Is preferable.
The adhesive which comprises the adhesive part 10 will not be specifically limited if it has the adhesive force which can adhere to the cover film 3 to such an extent that it does not peel naturally, Adhesion | attachment of a well-known adhesive, a heat sensitive adhesive, etc. An agent or the like can be used. By applying such a pressure-sensitive adhesive or the like to a predetermined range on the back surface of the label substrate 8, the sticking part 10 can be formed. Further, as shown in FIG. 5, a layer 10a is formed by applying an adhesive or the like on the entire back surface of the label substrate 8, and an ultraviolet curable ink or the like is applied except for a predetermined range on the back surface. By forming the non-sticking part 11, the sticking part 10 can also be formed.

The substrate 6 is not particularly limited, and a synthetic resin film, synthetic paper, paper, a laminate of different materials, or the like can be used. The decorative film 61 is provided with a design printing layer (not shown) on which a product name, a trademark, an instruction for use, a picture, and the like are printed.
The conductor layer 7 is a layer containing a conductive material such as a metal such as aluminum, nickel, or chromium, an alloy, or a metal oxide, for example, metal deposition, printing with ink containing a conductive material, The substrate 6 is laminated by thermal spraying, adhesion of a metal foil or a conductive film, or the like. Among these, it is preferable to use a vapor deposition layer as the conductor layer 7 because a large spark hardly occurs and does not surprise the user. In the case of metal deposition, the thickness of the conductor layer 7 is about 0.005 to 0.1 μm, preferably 0.015 μm or more, more preferably 0.04 μm or more, and preferably 0.08 μm or less. . For example, in the case of aluminum vapor deposition, the thickness is 0.01 to 0.08 μm, preferably 0.04 to 0.06 μm. Moreover, in the case of metal foil, although it changes with the electrical resistances of the metal, thickness is about 1-30 micrometers, and when apply | coating a conductive substance containing ink, thickness about 1-20 micrometers is illustrated. When a metal foil (for example, an aluminum foil having a thickness of 5 to 15 μm) is used, fine irregularities on the cut surface of the slit portion 9 (the slit portion end surface 7a of the conductor layer 7), preferably a pointed tip. If a fine unevenness having a convex portion (for example, a saw-tooth shape) is formed, a spark is easily generated, which is a preferable mode. Further, the conductor layer 7 is not limited to being laminated on the entire surface of the substrate 6, and may be partially laminated on a part of the substrate 6. Further, the size of the conductor layer 7 is that if the area of the conductor layer is too small, the receiving area of the microwave energy is reduced, and it becomes difficult to form a cut in a relatively thick sealing film. It is designed appropriately in consideration. For example, for a sealing film having a thickness of about 20 to 30 μm having a three-layer structure of PA / EVOH / OPP, a conductor layer 7 having a length of 10 × 20 mm and a thickness of 80 having a four-layer structure of PA / PET / EVOH / LLDPE. A conductive layer 7 of about 30 × 50 mm in length and width may be used for a sealing film of about ˜100 μm.
In general, the steaming label 5 is provided in a state of being attached to a release paper, but its form is not particularly illustrated.

The microwave processing packaging body 1 can be obtained by adhering the label for steaming 5 to the surface of the lid film 3 of the packaging body 4 via the adhesion section 10.
When the microwave processing packaging body 1 to which the label 5 for steaming as shown in FIG. 2 is stuck is put in a microwave oven and exposed to microwaves, as shown in FIG. A slit 12 having substantially the same shape (substantially X shape) as the slit portion 9 is formed. This is because the current generated in the conductor layer 7 gathers at the opposite portions (slit portions 9) of the side end faces 7a and 7a of the conductor layer 7 to generate sparks, which act on the lid film 3 to heat it. It is considered that the cut film 12 is melted to form a cut 12 having substantially the same shape as the slit portion 9 in the lid film 3.
Furthermore, since the label 5 for vapor transmission is adhered to the lid film 3 through the elongated sticking portion 10 provided along the slit portion 9, the lid film 3 is heated by the spark of the slit portion 9 or the like. When this is done, the heat does not spread over a wide range through the sticking part 10. Therefore, the limited part of the lid film 3 is intensively heated while suppressing the brittleness of the lid film 3 as much as possible, and the cut 12 having substantially the same shape as the slit portion 9 is quickly and reliably formed. Moreover, since the cover film 3 does not weaken widely, the external appearance of the cover film 3 after microwave irradiation is not impaired.
And when the cut | interruption 12 is formed in the lid | cover film 3, since this will become a ventilation hole and water vapor | steam escapes outside, it can prevent that the pressure in a sealed container increases and this bursts. Moreover, since the comparatively big hole part 14 is formed by the heat shrink of the lid | cover film 3 when the cut | interruptions 12, such as a substantially X shape, are formed as mentioned above, this user understands this hole part 14 easily. As the opening starting point, the lid film 3 can be easily opened and removed. For example, the non-sticking portion 11 at the end of the label 5 is picked as a pinch allowance, and the lid film 3 is opened while the label 5 is peeled off, or the lid film 3 is broken by putting a finger or the like into the hole portion 14. Thus, the lid film 3 can be easily opened.

According to the present invention, assuming a preferable cut 12 that is desired to be formed, a label for vapor transduction in which a slit portion 9 having substantially the same shape as that is formed and an elongated sticking portion 10 along the slit portion 9 is provided. By sticking 5 to the lid film 3, the planned cut 12 can be reliably and quickly formed while suppressing the lid film 3 from being weakened in a wide range. Moreover, since the cut | interruption 12 is formed after microwave irradiation only by sticking the label 5 of this invention on the lid | cover film 3, for example, many labels 5 for vaporization are prepared, and a known packaging body is used using a labeler etc. By sticking to the appropriate part of the cover film 3, the packaging body 1 for microwave processing can be obtained inexpensively and in large quantities.
In addition, according to the present invention, for example, a lid film 3 formed by laminating materials having relatively high heat resistance such as polyester and polyamide, a lid film 3 having a film thickness of about 100 μm, etc. Since the lid film 3 can be heated intensively, the air holes can be formed quickly.

It should be noted that the present invention is not limited to the above-described embodiments, and appropriate configurations can be added, substituted, combined, and changed in design within the scope intended by the present invention. Hereinafter, parts different from those of the above-described embodiments will be mainly described. For the same configuration, terms and drawing numbers are used, and description thereof is omitted.
(About labels for steaming)
In each of the above embodiments, the sticking part is provided only in the region corresponding to the slit part. However, when there is a possibility that the end of the label may be rolled up and inadvertently peeled off, for example, as shown in FIG. The auxiliary sticking part 15 for adhering the end part of the label auxiliary may be provided. This auxiliary sticking part 15 can be formed by application of an adhesive or the like similarly to the sticking part 10 and is provided so as not to be integrated with the sticking part 10.

  Moreover, in each said embodiment, although the base material 6 consists of a film of 2 layers, a single layer may be sufficient and a laminated film of 3 layers or more may be sufficient. Moreover, you may interpose a synthetic resin film etc. separately between the conductor layer 7 and the sticking part 10. FIG. Further, the conductor layer 7 may be laminated on the surface of the substrate 6. Furthermore, the slit portion 9 is not limited to being formed across the entire thickness direction of the label 5, and the slit portion 9 may be formed from the conductor layer 7 to the sticking portion 8, or conductive. The slit part 9 may be formed only in the body layer 7. In addition, as described above, the slit portion 9 is preferably formed by cutting with a cutter or the like as described above. However, the method of forming the slit portion 9 is not limited to this. For example, the slit portion 9 may be formed of an ink containing a conductive material. You may form by the method of printing the conductor layer 7, etc., ensuring the part 9 (gap in the side end surfaces 7a and 7a of the adjacent conductor layer 7).

  Moreover, if the base material 6 is comprised with the film which has heat shrinkability, the part 16 cut out by the cut | interruption 12 at the time of microwave irradiation will be made to protrude outside as shown to Fig.8 (a). It is preferable because it is possible. Thus, if it comprises so that the part 16 cut out by the cut | interruption 12 may come out outside, this part 16 can be picked as a picking piece, and the lid | cover film 3 can be fractured | ruptured easily. In this case, the base material 6 uses a material having a larger thermal shrinkage than the adhesive film such as the lid film 3 (if the sealing film is substantially non-shrinkable, the base material 6 may be slightly heat-shrinked). In addition, when the substrate 6 is composed of a plurality of layers, the uppermost layer (outermost layer) film having a larger thermal shrinkage than the sealing film may be used (the entire layer of the substrate 6 has heat shrinkability). In some cases, the top layer should have the largest heat shrinkage). Moreover, in order to make it protrude more largely, as shown in FIG.8 (b), the imaginary line | wire which connected both ends 9a and 9a of the slit part 9 of the shape which can form a knob is made into the heat shrink direction X of the base material 6. It is preferable to arrange them so as to be substantially orthogonal to.

(About the package)
In each of the above-described embodiments, the microwave processing package 1 is illustrated in which the vapor transmission label 5 is attached to the package 4 in which the opening of the container 2 is sealed with the lid film 3. For example, as shown in FIG. 9, an unsealed container (for example, a lunch box fitted with a lid) containing food or the like is covered with an encapsulated film 3 ′ (corresponding to a sealed film) such as polyvinylidene chloride. The thing which stuck the label 5 for steaming on the package 4 formed in a sealed form may be used.
In addition, the label 5 for vapor transmission is not restricted to sticking on the surface of a sealing film, It is also possible to stick on the back surface of a sealing film.

The perspective view which shows one Embodiment of the package body for microwave processings of this invention. (A) is a partially omitted perspective view including a cross-sectional view taken along the line AA in FIG. 1, and (b) is a back side (rear) view of the label for steaming in FIG. In FIG. 4B, for the sake of convenience, the portion where the adhesive is exposed is indicated by light ink painting (the same applies to FIGS. 4 and 7). (A)-(h) The top view which shows other embodiment of the label in which the slit part of various shapes was formed. (A)-(e) is a back view which shows other embodiment of the label in which various sticking parts were formed. The longitudinal cross-sectional view which shows other embodiment of the laminated constitution of a label. The principal part expansion perspective view which shows the state in which the cut | interruption was formed in the cover film, (b) is a partially abbreviated sectional view in the BB line of (a). The back view which shows the label provided with the auxiliary sticking part. (A) is a partially-omission perspective view including the cross section which shows the state by which the cut was formed in the package of other embodiment, (b) is a top view which shows other embodiment of a label. The perspective view which shows other embodiment of the package for microwave processing. The partially abbreviated perspective view including the longitudinal cross-sectional view of the package for microwave processing to which the label for vapor transmission currently examined is stuck.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Microwave processing packaging body, 2 ... Container, 3 ... Lid film, 3 '... Covering film, 4 ... Packaging body, 5 ... Label for steaming, 6 ... Base material, 61 ... Decoration film, 62 ... Base Film, 7 ... Conductor layer, 8 ... Label substrate, 9 ... Slit part, 10 ... Adhering part, 11 ... Non sticking part, 12 ... Cut, 14 ... Hole part, 15 ... Auxiliary sticking part, W ... Gap width of slit

Claims (3)

Attached to the sealing film of the microwave processing package, whose contents are sealed with a sealing film, through a sticking part made of an adhesive or the like, and a ventilation hole is formed in a part of the sealing film by microwave irradiation. A steaming label used to
A label base material having a conductor layer is provided, and a slit portion is formed in the conductor layer, and an adhesive portion is provided on the back surface of the label base material in a region corresponding to the slit portion. And the non-sticking part is provided around the said sticking part, The label for vaporization characterized by the above-mentioned. Attached to the sealing film of the microwave processing package, whose contents are sealed with a sealing film, through a sticking part made of an adhesive or the like, and a ventilation hole is formed in a part of the sealing film by microwave irradiation. A steaming label used to
A label substrate having a conductor layer, wherein a slit portion is formed in the conductor layer, and the sticking portion is provided in an elongated shape along the slit portion; Steaming label. A package for microwave treatment in which a label for vaporization is attached to a sealing film for sealing the contents, and a label for vaporization capable of forming a vent by melting a part of the sealing film by microwave irradiation,
The label for vapor transmission has a conductor layer in which a slit portion is formed, a region corresponding to the slit portion is defined on the back surface of the label, and this portion is adhered to a sealing film. A package for microwave processing.

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