JP6599798B2 - Package for microwave processing - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a microwave processing package capable of satisfactorily releasing vapor generated from inside a container during microwave processing.

2. Description of the Related Art Conventionally, a microwave processing package for heating contents (food, etc.) by performing microwave processing using a microwave oven or the like is known.
This package usually has a container having a container body for containing contents such as food, and a lid for sealingly sealing the container body. A steam vent opening is formed for escape.
Patent Document 1 discloses that an opening / closing label made of a heat-shrinkable film is attached to the lid surface so as to cover the steam vent opening in order to seal the steam vent opening. Patent Document 1 describes that when such a package is subjected to microwave treatment, the open / close label heated by the steam is thermally contracted and peeled off from the lid, and the steam from the opening for steam removal can be discharged to the outside.

  However, the vapor transmission label of Patent Document 1 may not be peeled off from the lid unless it is exposed to steam for a relatively long time. In such a case, the pressure in the container becomes very high, and when the vapor transmission label is peeled off, the internal pressure is high, so that a relatively large amount of the contents may be blown out together with the vapor, and the lid surface is wide. May get dirty. In addition, when a heat shrink ring (fastening sheet) for integrating the container body and the lid is used, the opening / closing label is restrained by the heat shrink ring, so that there is a possibility that the sealing of the opening for removing the steam may not be released satisfactorily. is there.

JP 2014-91543 A

  An object of the present invention is to provide a microwave processing package capable of releasing vapor in a container before the internal pressure becomes very high during microwave processing.

  The package for microwave processing according to the present invention includes a microwave processing container having a steam vent opening, a fastening sheet, and a steaming label, wherein the steaming label is a first base material, A second substrate that is laminated on the surface of the first substrate and has a smaller area than the first substrate, wherein the first substrate is substantially free of heat shrinkage. The second base material is formed from a sheet having heat shrinkability, and is end-ended in a region of the first base material where the second base material is not laminated. A score line is formed, the vapor transmission label is attached to the container so as to cover the opening for vapor removal with the first base material, and the fastening sheet is attached to the first label of the vapor transmission label. 2 It is attached to the container in contact with the surface of the substrate.

In a preferred microwave processing package according to the present invention, the container has a recess, the steam vent opening is formed in the recess, and the vapor transmission label cooperates with the recess of the container. And is attached so as to form a closed space.
In the preferable microwave processing package of the present invention, the cut line of the first base material is formed along or in the vicinity of the edge of the second base material.
In a preferred microwave processing package of the present invention, the score line is formed at two or more independent locations.
In a preferred microwave processing package according to the present invention, the first substrate has a score line formed outside the edge of the second substrate so as to surround the second substrate. An adhesive portion is provided in a region other than the region surrounded by the cut line in the back surface of the material, and the vapor transmission label is bonded to the container at the adhesive portion.

  In the preferable microwave processing package of the present invention, the fastening sheet is in a band shape, and at least a part of the cut line is extended non-parallel to the heat shrinkage direction of the second base material. The belt-like fastening sheet is attached to the periphery of the container so that the longitudinal direction of the fastening sheet is substantially orthogonal to the heat shrink direction of the second base material.

  The microwave processing package of the present invention can release the vapor in the container from the opening to the outside before the internal pressure of the container becomes very high during the microwave processing. For this reason, it is difficult to blow out the contents together with the steam, and it is possible to provide a package that can be warmed up beautifully.

The top view which looked at the steaming label for microwave processing concerning a 1st embodiment from the surface side. The top view which looked at the steaming label for microwave processing from the back side. However, in order to make it easy to understand, innumerable dots are given to the range where the adhesion portion is formed. III-III sectional view taken on the line of FIG. IV-IV sectional view taken on the line of FIG. The VV sectional view taken on the line of FIG. The top view which looked at the container from the upper side. VII-VII line sectional drawing of FIG. The disassembled perspective view of the package for microwave processing which concerns on 1st Embodiment. The perspective view of the package body for the same microwave processing. The principal part enlarged plan view which looked at the package body for microwave processing from the upper side. XI-XI sectional view taken on the line of FIG. A two-dot chain line is an imaginary line of the fastening sheet. The principal part perspective view which looked at the package at the time of a microwave process from the upper side. XIII-XIII sectional view taken on the line of FIG. A two-dot chain line is an imaginary line of the fastening sheet. The principal part enlarged plan view which looked at the package for microwave processing concerning the 1st example of a 2nd embodiment from the upper part. The principal part enlarged plan view which looked at the package for microwave processing concerning the 2nd example of a 2nd embodiment from the upper part. The top view which looked at the steaming label for microwave processing concerning the 1st example of a 3rd embodiment from the surface side. The top view which looked at the steaming label for microwave processing concerning the 2nd example of a 3rd embodiment from the surface side. The top view which looked at the steaming label for microwave processing concerning the 3rd example of a 3rd embodiment from the surface side. The top view which looked at the steaming label for microwave processing concerning the 4th example of a 3rd embodiment from the surface side.

The present invention will be described below with reference to the drawings.
In the present specification, the surface of the fumigation label or the fastening sheet refers to a surface that is the outside of the fume label or the fastening sheet attached to the container, and the back surface is the opposite side of the surface. Point to the surface. Moreover, the description “PPP to QQQ” means “PPP or more and QQQ or less”.
It should be noted that the thicknesses and lengths of the components in the drawings and the relative ratios of the components are different from the actual ones.

[First Embodiment]
<Fumigation label for microwave treatment>
In FIG. 1 thru | or FIG. 5, the vapor processing label A for microwave processing is the 1st base material 1, the 2nd base material 2 laminated | stacked on the surface of the said 1st base material 1, and the said 1st base material 1 of FIG. And an end cut line 3 formed in the plane.
The size of the second substrate 2 is smaller than the size of the first substrate 1. The second base material 2 is laminated in the plane of the first base material 1. The 1st base material 1 is formed from the sheet | seat which does not have heat shrinkability substantially, and the 2nd base material 2 is formed from the sheet | seat which has heat shrinkability.

Specifically, the plan view shapes of the first base material 1 and the second base material 2 are not particularly limited, and are each independently a substantially rectangular shape in plan view, a substantially circular shape in plan view, a substantially elliptical shape, and a substantially triangular shape. And a substantially polygonal shape such as a substantially hexagonal shape. The substantially rectangular shape means a substantially rectangular shape or a substantially square shape. In the present invention, the “substantially” shape means a shape allowed in the technical field to which the present invention belongs. The “substantially” in a substantially rectangular shape, a substantially square shape, a substantially triangular shape, and a substantially polygonal shape in plan view includes, for example, a shape in which a corner is chamfered, a shape in which a part of a side is slightly inflated or depressed, and a side is A slightly curved shape is included. In addition, the “substantially” of the substantially circular shape and the substantially elliptical shape in a plan view includes, for example, a shape in which a part of the circumference is slightly inflated or depressed, and a shape in which a part of the circumference is slightly straight or oblique. .
In the example of illustration, the said 1st base material 1 is formed in planar view substantially rectangular shape by which the corner | angular part was chamfered, and the 2nd base material 2 is formed in planar view substantially circular shape. When the 1st base material 1 or the 2nd base material 2 is formed in planar view substantially rectangular shape, the aspect ratio can be set suitably, For example, it is vertical length: horizontal length = 1: 3-3: 1.

The size (area) of the first base material 1 in plan view is not particularly limited as long as it is a size that can cover the entire opening for steam removal of the container. Is attached to the top surface of the concave portion of the container, the first base material 1 is formed to have a larger area than the planar view shape area of the concave portion.
The size (area) of the second substrate 2 in plan view is smaller than that of the first substrate 1. That is, the second substrate 2 has a smaller area than the first substrate 1. The area of the second base material 2 is not particularly limited as long as it is smaller than the area of the first base material 1, but if it is too large, an adhesive portion described later has a relatively small area, while if it is too small, the second base material 2. Due to the thermal contraction of 2, the contraction force for causing the steam escape port in the cut line 3 is relatively reduced. From such a viewpoint, the area of the second base material 2 is, for example, 0.2 to 0.9 times the area of the first base material 1, and preferably 0.3 to 0.8 times. is there.

It is preferable that the 1st base material 1 is formed from the sheet | seat which is a flexible sheet | seat and does not have heat shrinkability substantially.
Here, in the present specification, a sheet that does not substantially have heat shrinkability does not shrink when heated to the heat shrink temperature, or even if it shrinks, its thermal shrinkage rate is acceptable in the technical field to which the present invention belongs. Is the error range. The error range as described above includes, for example, a case where thermal contraction rates in a first direction and a second direction described later are each less than 5%.
Examples of the substantially non-heat-shrinkable sheet include paper, synthetic paper, a synthetic resin sheet substantially non-heat-shrinkable, a nonwoven fabric and a foamed resin sheet, and a laminate sheet thereof. The laminate sheet having substantially no heat shrinkability is a layer having no heat shrinkability and a layer having heat shrinkability, provided that the laminate does not have heat shrinkability as a whole. It may be a laminate. Preferably, a synthetic resin sheet that does not substantially have heat shrinkability or a laminated sheet that does not substantially have heat shrinkage including the same is used as the first base material 1, and more preferably substantially. A synthetic resin sheet having no heat shrinkability is used.

The material of the synthetic resin sheet is not particularly limited, and polyester resins such as polyethylene terephthalate and polylactic acid; olefin resins such as polypropylene; styrene resins such as polystyrene and styrene-butadiene copolymers; cyclic olefin resins; One type or a mixture of two or more types selected from thermoplastic resins such as vinyl chloride resins can be used. The synthetic resin sheet having substantially no heat shrinkability may be composed of a single resin layer, or may be composed of a plurality of different or different types of resin layers. Further, the first base material 1 is preferably a sheet that does not spark itself even when subjected to microwaves (one that does not substantially contain a component that can be sparked by microwaves). Sheets that do not spark themselves and do not generate heat (those that are substantially free of components that can generate sparks and generate heat due to microwaves) are more preferable.
In this specification, a sheet is synonymous with what is called a film.

The thickness of the 1st base material 1 is not specifically limited, For example, they are 20 micrometers-120 micrometers, Preferably they are 20 micrometers-100 micrometers, More preferably, they are 30 micrometers-60 micrometers. It is preferable to use the first base material 1 having a thickness smaller than that of the second base material 2 because the first base material 1 is easily deformed in the thickness direction according to the heat shrinkage of the second base material 2.
Moreover, the 1st base material 1 may be provided with the design printing layer as needed (a design printing layer is not shown). The first substrate 1 may be either transparent or non-transparent, but when the design print layer is provided on the back side, a material having excellent transparency is used.
In the present specification, transparent (colorless transparent or colored transparent) refers to a case where the total light transmittance is 70% or more, preferably 80% or more, more preferably 90% or more. However, the total light transmittance refers to a value measured by a measurement method based on JIS K 7361 (a test method for the total light transmittance of a plastic-transparent material).

As the second substrate 2, a flexible sheet having heat shrinkability (hereinafter referred to as a heat shrinkable sheet) is used. A heat-shrinkable sheet is a sheet that shrinks in the direction of heat shrinkage when heated to a heat shrinkage temperature. Examples of the heat shrink temperature include 60 ° C. to 120 ° C.
Examples of the heat-shrinkable sheet include a heat-shrinkable synthetic resin sheet, a nonwoven fabric, a foamed resin sheet, and a laminated sheet thereof. The laminated sheet having heat shrinkability may be a laminate of a layer having no heat shrinkability and a layer having heat shrinkability, provided that the whole laminate has heat shrinkability. . Preferably, the second base material 2 is a heat-shrinkable synthetic resin sheet or a heat-shrinkable laminated sheet containing the same, and more preferably a heat-shrinkable synthetic resin sheet. .
The material of the synthetic resin sheet is not particularly limited, and polyester resins such as polyethylene terephthalate and polylactic acid; olefin resins such as polypropylene; styrene resins such as polystyrene and styrene-butadiene copolymers; cyclic olefin resins; One type or a mixture of two or more types selected from thermoplastic resins such as vinyl chloride resins can be used. The heat-shrinkable synthetic resin sheet may be composed of one resin layer, or may be composed of a plurality of different or different types of resin layers. Moreover, the 2nd base material 2 has a preferable sheet | seat which does not spark itself even if it receives a microwave.

As the second base material 2 (heat-shrinkable sheet), a uniaxially stretched sheet (sheet whose first direction is the heat-shrinkable direction) that mainly heat-shrinks at least in the first direction or heat mainly in the first and second directions. A biaxially stretched sheet that contracts (a sheet in which the first direction and the second direction are both heat-shrinkable) can be used. The first direction means one direction in the plane of the sheet, and the second direction is a direction orthogonal to the first direction in the plane.
In particular, as the second base material 2, it is preferable to use a uniaxially stretched sheet mainly thermally contracted in the first direction and having a relatively low temperature contractibility, for example, a contraction start temperature is about 60 ° C. Polystyrene sheets are preferred. By using the 2nd base material 2 which has low temperature shrinkability, the 2nd base material 2 heat-shrinks reliably in the initial stage of the microwave process with little generation amount of a vapor | steam. For this reason, before the internal pressure of a container becomes high, a vapor | steam escape opening arises by a vaporization label, and a vapor | steam can be discharged | emitted reliably.

The heat shrinkage rate in the first direction of the second base material 2 is not particularly limited, but is preferably 20% or more, and more preferably 30% or more. In addition, although the heat shrinkage rate in the said 1st direction is so preferable that it is large, since there exists a limit naturally, the heat shrinkage rate in the said 1st direction is theoretically less than 100%. When the said 2nd base material 2 is a uniaxially stretched sheet, the thermal contraction rate in the 2nd direction is -3-15%, for example, Preferably it is 0-12%. The minus of the thermal contraction rate means thermal elongation. Moreover, when the said 2nd base material 2 is a biaxially stretched sheet, the thermal contraction rate in the 2nd direction is although it does not specifically limit, Preferably it is 20% or more, More preferably, it is 30% or more.
However, in the present invention, the heat shrinkage ratio is the length of the test piece before heating (original length) and the length of the test piece after dipping the test piece in 85 ° C. warm water for 10 seconds (after immersion). Length) and is obtained by substituting into the following equation.
Thermal contraction rate (%) = [{(original length in first direction or second direction) − (length after immersion in first direction or second direction)} / (first direction or second direction Original length)] × 100.

The second base material 2 (heat-shrinkable sheet) preferably has a shrinkage stress in the heat shrinkage direction of 3 MPa or more, and more preferably has a shrinkage stress of 4 MPa or more. In addition, although the shrinkage stress of the 2nd base material 2 is so preferable that it is large, the upper limit is 20 MPa normally. As described above, the heat shrink direction of the uniaxially stretched sheet is the first direction, and the heat shrink direction of the biaxially stretched sheet is the first direction and the second direction.
The shrinkage stress refers to the maximum shrinkage stress in the heat shrinkage direction when the test piece is immersed in warm water at 85 ° C. for 10 seconds. The shrinkage stress is measured by setting the length of the test piece in the first direction (or the second direction) to 200 mm and the length of the second direction (or the first direction) to 15 mm. Both ends of the second direction) are held on a chuck of a stress measuring instrument (manufactured by Shimadzu Corporation, product name: Autograph) (distance between chucks: 100 mm) and generated while immersed in warm water at 85 ° C. for 10 seconds. It is determined by the maximum value of shrinkage stress.

The thickness of the 2nd base material 2 is not specifically limited, For example, they are 30 micrometers-150 micrometers, Preferably they are 30 micrometers-120 micrometers, More preferably, they are 30 micrometers-80 micrometers.
Moreover, the 2nd base material 2 may be provided with the design printing layer as needed (a design printing layer is not shown). The second substrate 2 may be either transparent or non-transparent, but when a design print layer is provided on the back side, a material having excellent transparency is used.

The second substrate 2 is laminated and adhered in the surface of the first substrate 1. Hereinafter, the area | region where the 2nd base material 2 is laminated | stacked among the 1st base materials 1 may be called a lamination | stacking area | region.
The second base material 2 may be laminated on the first base material 1 so that a part of the edge of the second base material 2 coincides with a part of the edge of the first base material 1, or the second base material 2 The substrate 2 may be laminated on the first substrate 1 so that the entire edge of the substrate 2 does not coincide with the edge of the first substrate 1. Preferably, as shown in the drawing, the second substrate 2 is laminated in the surface of the first substrate 1 so that the entire edge of the second substrate 2 does not coincide with the edge of the first substrate 1. In other words, in the first base material 1, the second base material 2 is the first base so that a region where the second base material 2 is not laminated is formed in an annular shape in plan view outside the edge of the second base material 2. Laminated on the surface of the material 1. In the present specification, it should be noted that an annular shape is not limited to a circular shape.

The back surface of the second substrate 2 is bonded to the surface of the first substrate 1. It is preferable that the entire back surface of the second base material 2 is bonded to the surface of the first base material 1 in order to cause the contraction force of the second base material 2 to sufficiently act on the first base material 1. The adhesive strength of the second base material 2 to the first base material 1 is not particularly limited as long as the strength is equal to or higher than the degree that the second base material 2 is not peeled off from the first base material 1 during heat shrinkage. For example, the adhesive strength of the second base material 2 is 3N / 25 mm or more, preferably 4N / 25 mm or more.
However, the adhesive strength is in accordance with JIS Z 0237, a test piece having a width of 25 mm is prepared by attaching the back surface of the second base material 2 to the surface of the first base material 1, and the peeling angle of the second base material 2 is 180 degrees. It is a value measured by peeling under the conditions of a peeling speed of 300 mm / min and a temperature of 23 ° C.

The method for adhering the second base material 2 to the first base material 1 is not particularly limited. Generally, the second base material 2 is bonded by interposing an adhesive or an adhesive between the two base materials. When the material is made of a material that can be solvent-bonded, it may be welded using a solvent.
In the example of illustration, the 2nd base material 2 is adhere | attached on the 1st base material 1 via the adhesive layer 41 (or adhesive layer). A conventionally well-known thing can be used for the said adhesive, and a pressure sensitive adhesive is typically used. The pressure-sensitive adhesive is an adhesive having an adhesive force at normal temperature and maintaining the adhesive force for a long time, and is widely used in conventionally known tack labels. Moreover, a conventionally well-known thing can be used for the said adhesive agent, For example, an acrylic adhesive etc. are mentioned.
The pressure-sensitive adhesive (or adhesive) may be provided in a solid shape on the entire back surface of the second substrate 2, or may be provided on the entire back surface in a mesh shape or innumerable dots. Since the pressure-sensitive adhesive layer 41 (or adhesive layer) having a uniform thickness and no gap can be formed over the entire back surface as shown in the example, the pressure-sensitive adhesive is preferably provided in a solid shape.
The thickness of the pressure-sensitive adhesive layer 41 (or adhesive layer) is appropriately set to such an extent that the second substrate 2 can be bonded to the first substrate 1 and the thermal contraction of the second substrate 2 is not inhibited. The thickness of the pressure-sensitive adhesive layer 41 (or adhesive layer) is, for example, 10 μm to 30 μm.

As described above, the first base material 1 has a region where the second base material 2 is not laminated. Hereinafter, this region may be referred to as a non-stacked region.
The end cut line 3 is a cut that penetrates in the thickness direction of the first base material 1 and partially bisects the first base material 1, and ends 3 a, A cut having 3b.
A part or all of the score line 3 may extend in a direction substantially parallel to the first direction (heat shrinkage direction) of the second substrate 2, or a part or all of the score line 3 is a second group. The material 2 may extend in a direction non-parallel to the first direction of the material 2. Preferably, at least a part of the cut line 3 extends in a direction non-parallel to the first direction of the second base material 2.
For example, the score line 3 has a main part including a part extending in a direction non-parallel to the first direction (thermal shrinkage direction) of the second base material 2. As will be described later, when the second base material 2 is thermally contracted and pulls the first base material 1, the region inside the incision line 3 rises upward so as to be separated from the lid, curls, and the steam escape port is formed. Cause it to occur. Further, by curling as described above, the fastening sheet covering the vapor transmission label is pushed up, a gap between the surface of the vapor transmission label A and the closure seal is widened, and steam can be released smoothly.

The cut line 3 may be formed at one place, or may be formed at a plurality of places (two or more places). In the present embodiment, a plurality of independent score lines 3 are formed in the non-stacked region. In the illustrated example, four cut lines 3 are formed independently at least in the non-stacked region.
The cut line 3 only needs to be formed at least in the non-stacked region. For example, the cut line 3 may be formed only in the non-laminated region, or may be formed independently in both the non-laminated region and the laminated region, or the non-laminated region and the laminated region. It may be formed so as to straddle.

The score line 3 existing in the non-laminated region may be formed along the edge 2a of the second base material 2, or may be formed in the vicinity of the edge 2a of the second base material 2, Alternatively, it may be formed away from the edge 2a of the second substrate 2. In addition, the score line 3 existing in the non-laminated area may have a portion formed along the edge 2a of the second base material 2 and a portion formed in the vicinity of the edge 2a of the second base material 2. Or you may have the part currently formed in the vicinity of the edge 2a of the 2nd base material 2, and the part formed away from the edge 2a of the 2nd base material 2.
In the illustrated example, four cut lines 3 are formed in the vicinity of the edge 2 a of the second substrate 2, respectively.
The vicinity of the edge 2a of the second base material 2 includes a range within 3 mm from the edge 2a of the second base material 2 in the non-laminated region. Preferably, the plurality of score lines 3 are formed in a range including a range within 1.5 mm from the edge 2a of the second substrate 2 in the non-laminated region, more preferably 1 mm from the edge 2a of the second substrate 2. It is formed in the range including the range within.
Note that “the cut line is formed along the edge of the second base material or is formed in the vicinity of the edge of the second base material” means that the entire one cut line 3 is the edge 2a. Along the edge 2a or in the vicinity of the edge 2a, and the main part 31 of the one cutting line 3 (the main part is, for example, the length of the cutting line 3 × 3/4 or more) along the edge 2a. Or in the vicinity of the edge 2a.

The plurality of cut lines 3 may be linear in plan view or non-linear in plan view. Since a relatively large steam escape opening is generated in the cut line 3 due to the thermal contraction of the second base material 2, the cut line 3 is preferably non-linear in a plan view. Examples of the non-linear shape of the cut line 3 include a substantially arc shape, a substantially wave shape, a substantially square shape, a substantially saw blade shape, and a combination shape of these shapes.
In the illustrated example, the plurality of score lines 3 are formed, for example, in a substantially arc shape in plan view.
The cut line 3 is formed along the edge 2 a in the vicinity of the edge 2 a of the second base material 2. In the illustrated example in which the second base material 2 is formed in a substantially circular shape in plan view, the cut line 3 along the edge 2a of the second base material 2 has a main portion 31 formed in a substantially arc shape in plan view. ing. The main part 31 is non-parallel to the heat shrinkage direction of the second substrate 2 in most parts.

The plurality of cut lines 3 are connected to each other through uncut portions 39. That is, the uncut portion 39 is provided between one cut line 3 and the adjacent cut line 3. The length of the uncut part 39 is not specifically limited, For example, it is about 1 mm-7 mm. The length of the uncut portion 39 refers to the shortest straight line length between one cut line 3 and the adjacent cut line 3.
The length of one cut line 3 is not particularly limited, but if it is too small, there is a possibility that a good vapor escape port may not be generated during microwave processing. If it is too large, the length from the front side of the label to the back side through the cut line 3 There is a risk that a lot of dust will get into the bottom. From this point of view, the length of one cut line 3 is preferably 5 mm to 40 mm, more preferably 10 mm to 35 mm, and further preferably 15 mm to 30 mm. In addition, the length of the cut line 3 with a end means the length (trajectory of the cut line 3) from the edge part 3a of the one side of the cutting line 3 to the edge part 3b of the opposite side.

The plurality of score lines 3 may be intensively arranged in the vicinity of a part of the edge 2a of the second base 2 (for example, half of the peripheral 2a), or the second base 2 may be You may arrange | position so that it may surround. Since a large vapor escape hole can be generated in the first base material 1 during the microwave treatment, the plurality of score lines 3 are arranged outside the edge 2 a of the second base material 2 so as to surround the second base material 2. It is preferable to arrange | position. That is, when it is assumed that the uncut portion 39 is cut, the plurality of cut lines 3 are arranged so that the laminated region comes out of the first base material 1.
In the illustrated example, four cut lines 3 having substantially the same shape in plan view are arranged along the peripheral edge 2 a of the second base member 2 at substantially equal intervals in the circumferential direction. However, the plurality of score lines 3 are not limited to being arranged at regular intervals, and may be arranged at irregular intervals. Further, the plurality of cut lines 3 are not limited to the same shape in plan view, and the plan view shape of at least one cut line 3 selected from the plurality of cut lines 3 is different from the plan view shape of the other cut lines 3. May be.

  Each incision line 3 in the illustrated example is formed at a main portion 31 (a portion in a plan view arc shape) along the edge shape of the second base material 2 and an end portion on one side of the main portion 31 and the second base material. And a return portion 32 that warps in a direction away from 2. The return portion 32 may be formed at one end and the opposite end of the main portion 31, respectively. Alternatively, the cut line 3 includes only the main portion 31 and does not have to have a return portion.

An adhesive portion 49 is provided on the back surface of the first base material 1. The adhesion part 49 is a part provided to adhere the vapor transmission label A to the container.
The bonding portion 49 may be provided on the entire back surface of the first base material 1 or may be provided on a part of the back surface of the first base material 1. When the region surrounded by the plurality of cut lines 3 is adhered to the container, the region inside the cut line 3 in the first base material 1 is caused by the thermal contraction of the second base material 2 during the microwave treatment. There is a risk that it will not stand up sufficiently. In this regard, even in a label in which the adhesive portion 49 is provided on the entire back surface of the first base material 1, a region surrounded by the cut line 3 (hereinafter, a region surrounded by the cut line 3 is referred to as a surrounding region). In the steaming label A of the present invention, the range in which the adhesive portion 49 is provided is not particularly limited. However, regardless of the relationship with the attachment position on the container, the surrounding area does not adhere to the container, and therefore the adhesive portion 49 is provided in an area other than the surrounding area on the back surface of the first base material 1. Is preferred. In this case, the adhesive portion 49 may be provided in a part of the region other than the surrounding region, or may be provided in the entire region other than the surrounding region. Preferably, the bonding portion 49 is provided in an area other than the surrounding area and is provided in an annular shape in plan view so as to surround the surrounding area.
In the illustrated example, the adhesive portion 49 is provided up to the edge of the first base material 1, and is preferably a region other than the surrounding region and from the position away from the main portion 31 of the score line 3. Is provided in an annular shape in a plan view zone.

The adhesive portion 49 is composed of an exposed surface of the pressure-sensitive adhesive layer 42 (or adhesive layer).
For example, the adhesive portion 49 is (1) a system in which a pressure-sensitive adhesive (or adhesive) is applied only to a region of the back surface of the first base material 1 where the adhesive portion 49 is formed, and (2) the first base material 1. After the pressure-sensitive adhesive (or adhesive) is applied to the entire back surface of the film to form the pressure-sensitive adhesive layer 42 (or adhesive layer), a masking agent is applied to a region other than the region where the adhesive portion 49 is formed in the pressure-sensitive adhesive layer 42. Is applied, and the portion other than the adhesive portion is covered with the masking layer 43 (see FIGS. 3 to 5). According to the form (2), the adhesive force of the pressure-sensitive adhesive layer 42 in the region where the masking layer 43 is provided in the pressure-sensitive adhesive layer (or adhesive layer) is weakened or concealed by the masking layer 43. Therefore, substantially only the region where the masking layer is not provided (the adhesive layer or the exposed surface of the adhesive layer) serves as the adhesive portion 49.
A conventionally well-known thing can be used for an adhesive or an adhesive agent. The thickness of the pressure-sensitive adhesive layer 42 (or adhesive layer) is appropriately set to such an extent that the label can be adhered to the container and the thermal contraction of the second substrate 2 is not inhibited. The thickness of the pressure-sensitive adhesive layer 42 (or adhesive layer) is, for example, 10 μm to 30 μm.
As the masking agent, one having a property of weakening or concealing the adhesive force of the adhesive or adhesive is used. A conventionally well-known thing can be used for a masking agent, For example, the ultraviolet curable ink etc. which do not contain a coloring agent are mentioned. The thickness of the masking layer 43 is appropriately set to such an extent that the adhesive force can be weakened or concealed and the thermal contraction of the second substrate 2 is not inhibited. The thickness of the masking layer 43 is, for example, 1 μm to 10 μm.

<Microwave processing vessel>
The microwave processing container is not particularly limited as long as it is a sealed container in which a steam vent opening is formed. For example, a shape maintaining container such as a sheet molding container, an injection molding container, or a foamed resin container using a resin is used. A soft soft container may be used. The shape maintaining container refers to a container whose shape does not substantially deform when the contents are stored, and the soft container refers to a container that swells and deforms when the contents are stored.

6 and 7 show an example of the shape maintaining container. The microwave processing container B communicates with the storage space, the container body 5 having a storage space for storing contents such as microwave-cooked food, a lid 6 that seals the opening of the container body 5 in a sealing manner. And a steam release opening 7.
The container body 5 is a concave body made of a sheet molded product, an injection molded product, a foamed resin molded product, or the like. The shape of the container body 5 in plan view is not particularly limited, and examples thereof include a substantially rectangular shape in a plan view, a substantially circular shape in a plan view, a substantially elliptical shape, a substantially triangular shape, and a substantially hexagonal shape. The container body 5 in the illustrated example has a substantially circular shape in plan view. Around the upper end of the container body 5, an annular flange portion 51 extending in plan view is extended. Further, a stepped portion 52 is provided around the upper portion of the container main body 5 by projecting the upper inner wall of the container main body 5 in the radially outward direction.

  The lid 6 is made of a sheet molded product, an injection molded product, a foamed resin molded product, or the like. The lid 6 is fitted inside the container body 5. In the illustrated example, a protrusion 61 that fits into a step 52 around the inside of the container body 5 is provided around the periphery of the lid 6. The projection 61 is fitted into the stepped portion 52 of the container body 5 and the lid 6 is detachably attached to the container body 5 by bringing the peripheral edge of the lid 6 into contact with the flange 51 of the container body 5. It has been. The lid 6 attached to the container body 5 is further fixed by the fastening sheet C so as not to be removed from the container. If necessary, the peripheral edge of the lid 6 and the flange 51 of the container main body 5 or the protrusion 61 of the lid 6 and the stepped portion 52 of the container main body 5 can be peeled by hand in order to ensure sealing performance. You may adhere | attach with the adhesive force of. The lid 6 and the container body 5 are typically bonded by heat welding, but may be bonded using an adhesive.

The container B is formed with a steam release opening 7. The steam release opening 7 is usually formed in the lid 6. Note that the steam release opening 7 is not limited to being formed in the lid 6, and may be formed in the upper part of the container body 5, for example.
The formation position of the opening part 7 for steam release will not be specifically limited if it is a position connected to the storage space of the container B, and can be set suitably.
For example, the steam release opening 7 is formed in the recess 62 formed in the container B, and preferably formed on the bottom surface of the recess 62. The concave portion 62 of the container B refers to a part of the container B that is recessed inward. The recess 62 is formed in the lid 6 of the container B or the container body 5. In the illustrated example, the steam release opening 7 is formed in the recess 62 of the lid 6.
The recess 62 of the lid 6 is formed, for example, in a part of a range surrounded by the annular projection 63 in plan view. The protrusion 63 is a portion protruding in comparison with the recess 62 in relation to the recess 62. The shape in plan view of the recess 62 is not particularly limited, and in the illustrated example, it is formed in a substantially rectangular shape in plan view. The depth of the recess 62 is not particularly limited. However, if the depth is too small, the recess 62 is not substantially formed. If the depth is too large, the inside of the recess 62 may come into contact with the contents stored in the storage space. From this viewpoint, the depth of the recess 62 is preferably 3 mm to 15 mm.

The steam release opening 7 is formed on the bottom surface of the recess 62 of the lid 6.
The shape in plan view of the opening 7 for releasing steam is not particularly limited, but is a straight line with ends; a non-linear shape with ends such as an X shape, a Y shape, a U shape, a V shape, a C shape; A hole or a hole having a relatively large diameter, etc .;
In the illustrated example, one U-shaped steam vent opening 7 is formed in the bottom surface of the concave portion 62 of the lid 6 by forming an end-cut non-linear cut in the thickness direction of the lid 6. . The steam in the container B is discharged to the outside through the U-shaped steam vent opening 7. In particular, when the incision direction of the opening for steam release 7 is a direction parallel to the width direction of the fastening sheet and intersects the incision line 3, the steam is directed from the incision line 3 to the width direction of the fastening sheet. It is preferable because it is more smoothly discharged.

<Packaging for microwave processing>
As shown in FIGS. 8 and 9, the microwave processing package D includes the microwave processing container B, the microwave processing vaporizing label A, and a fastening sheet C.
The fastening sheet C is a member attached to the container mainly for the purpose of preventing the lid 6 of the container B from being inadvertently removed from the container body 5. But the fastening sheet | seat C may be attached to the container for purposes other than such a purpose.
As will be described later, the fastening sheet C is attached to the container B while being in contact with the surface of the second substrate 2 of the steaming label A.
In the illustrated example, the fastening sheet C is a belt-like sheet having a predetermined width. The fastening sheet C is wound around the container B in an annular shape so as to straddle the lid 6 and the container body 5 to which the vapor transmission label A is attached. Thus, by winding the belt-shaped fastening sheet C around the container B, the lid 6 is prevented from being inadvertently detached from the container body 5.

The fastening sheet C may be formed from a sheet having substantially no heat shrinkability, or may be formed from a heat shrinkable sheet, or substantially not having heat shrinkability. You may be comprised from the sheet | seat (henceforth a composite connection sheet | seat) with which the sheet | seat and the heat-shrink sheet | seat were connected in the longitudinal direction.
The fastening sheet C composed of the composite connection sheet is formed in a band shape by joining both ends in the longitudinal direction of a belt-like heat-shrinkable sheet and a belt-like heat-shrinkable sheet. .
As the sheet having substantially no heat shrinkability, a sheet as exemplified in the explanation column of the first base material can be used, and the heat shrinkable sheet is exemplified in the explanation column of the second base material. Such a sheet can be used. When the fastening sheet C is formed of a heat-shrinkable sheet or a composite connecting sheet, it is preferable that the heat-shrinkable direction of the heat-shrinkable sheet is the longitudinal direction of the fastening sheet C.
Since the belt-like fastening sheet C as described above is attached to the container B by being strongly wound around the container B, the fastening sheet C is adhered to the container using a separate adhesive, adhesive or adhesive tape. Although it is not necessary, it may be partially adhered to the container B as necessary.

As shown in FIGS. 9 to 11, the microwave treatment vapor transmission label A is attached to the container B so that the first base material 1 covers the steam release opening 7 of the microwave treatment container B. It is attached.
Specifically, the first base material 1 of the vapor transmission label A is attached so as to cover the opening for steam removal 7 through an adhesive portion 49 (the adhesive portion 49 is not shown in FIGS. 9 to 11). It has been. Preferably, the surrounding area of the steaming label A is disposed and attached so as to cover the steam vent opening 7 when viewed from the direction orthogonal to the surface of the steaming label A. In the present embodiment in which the opening 7 for steam release is formed on the bottom surface of the recess 62 of the container B, the vapor passing label A is attached so as to cover the opening 7 for steam release while being in contact with the bottom surface of the recess 62. Alternatively, it may be attached so as to cover the steam release opening 7 while being away from the bottom surface of the recess 62.
In the illustrated example, the vapor transmission label A is affixed to the outer surface of the projecting portion 63 projecting from the periphery of the recessed portion 62 of the container B via the adhesive portion 49. In the steaming label A attached in this way, the back surface of the first base material 1 is separated from the bottom surface of the recess 62, and forms a closed space 621 in cooperation with the recess 62 of the container B. Further, the cut line 3 of the vapor transmission label A faces the closed space 621 without contacting the outer surface of the container B.

Moreover, although the back surface of the area | region inside the cut line 3 among the back surfaces of the 1st base material 1 of the vapor permeation label A may be in contact with the outer surface of the container B, it is preferable that it is not adhere | attached. If the back surface of the region inside the cut line 3 is bonded to the container B, the cut line 3 may not be easily opened during the microwave treatment. Specifically, at least the back surface of the surrounding area may be in contact with the container B, but is preferably not bonded to the container B. In the illustrated example, the surrounding region and the peripheral portion of the region are not bonded to the container B, and form a closed space 621 in cooperation with the recess 62. In addition, the said adhesion means the state which has adhered to the container with the adhesive force that the 1st base material 1 was not peeled with the force of steam.
The steaming label A may be attached to the container B with the direction of heat shrinkage of the second base material 2 facing an arbitrary direction. Preferably, the vapor transmission label A is attached so that the heat shrink direction of the second substrate 2 is substantially orthogonal to the longitudinal direction of the fastening sheet C described later.

A fastening sheet C is wound around a container B to which the steaming label A is attached.
For example, as shown in FIG. 8, the fastening sheet C formed from a sheet that does not substantially have heat shrinkage has a belt-like shape before being attached to the container B, and the belt-like fastening sheet C is attached to the container B. Is formed in a ring shape at the same time as the container B is mounted. The fastening sheet C formed from the heat-shrinkable sheet or the composite connecting sheet is obtained by (1) winding a belt-like fastening sheet around the container B and bonding both ends of the sheet, and then heat-shrinking the sheet. At the same time as the container B is mounted, it is formed in a ring shape, or (2) the container B is mounted on the container B by covering the periphery of the container B and then heat-shrinking it. Is done.

  The width of the belt-shaped fastening sheet C is not particularly limited, but if it is too small, the fastening sheet C may be broken during storage and transportation. Material costs also rise. From this viewpoint, the width of the fastening sheet C is about 30 mm to 100 mm. The width of the fastening sheet C refers to the length in the direction orthogonal to the longitudinal direction.

The fastening sheet C is attached to the container B so as to be in contact with the surface of the steaming label A. In addition, the attached fastening sheet C is in contact with the flat outer surface of the container B at a location where the vapor transmission label A does not exist.
The position of the fastening sheet C with respect to the steaming label A is not particularly limited, and can be arbitrarily set by appropriately changing the width of the fastening sheet C and the winding arrangement of the fastening sheet C.
For example, as shown in FIG. 10, the fastening sheet C is attached to the container B such that the longitudinal direction of the fastening sheet C is substantially orthogonal to the heat shrink direction of the second base material 2.
Moreover, as shown in FIG. 10, the said fastening sheet | seat C is attached to the container B so that the whole surface of the vapor transmission label A may be covered. In this case, both side edges C1 and C2 in the width direction of the fastening sheet C protrude outward from both edges of the vapor transmission label A. In addition, in the aspect attached so that the fastening sheet | seat C may cover the whole vapor transmission label A, either one of the width direction both edges C1, C2 of the fixation sheet C overlaps with one edge of the vapor transmission label A, and the other is You may protrude from the edge on the opposite side of the vaporization label A, or the width direction both-side edges C1 and C2 of the fastening sheet C may overlap with the edge of the vaporization label A (not shown).
Since the fastening sheet C covers the entire vapor-permeable label A in this way, it is possible to more reliably prevent external dust and the like from entering the container through the cut line 3 and the vapor vent opening 7.
The widthwise side edges C1, C2 of the fastening sheet C are edges extending in the longitudinal direction of the fastening sheet C on both sides of the fastening sheet C in the width direction.

<Usage of package for microwave processing>
The microwave processing package D is subjected to microwave processing.
By irradiating the microwave, the contents are heated and steam starts to be generated, and the steam is discharged from the storage space of the container B through the opening 7 for venting the steam, Come into contact. When the heat of the steam is transmitted to the steaming label A, the second base material 2 starts to shrink. The score line 3 is formed in the non-laminated region of the first base material 1, and the first base material 1 does not substantially heat shrink, but the second base material 2 heat shrinks. The laminated region contracts following the thermal contraction of the second substrate 2. As the stacked region of the first base material 1 contracts, as shown in FIGS. 12 and 13, the steam escape port 71 is generated by curling so that the region inside the cut line 3 rises upward. When the inner region curls upward, the end 1a of the region lifts the fastening sheet C slightly upward, and there is a slight gap between the back surface of the fastening sheet C and the surface of the vapor transmission label A. A gap is generated, and steam is discharged from the gap to the outside. Note that the fastening sheet C and the container B are easily adhered to each other by the vapor (moisture) generated by the microwave treatment, but the fastening sheet C that has been in contact with the outer surface of the container B by lifting the fastening sheet C by the vapor transmission label A. Rises slightly, and steam is discharged from there. In particular, since at least a part of the score line 3 extends non-parallel to the heat shrink direction of the second substrate 2 and the width direction of the fastening sheet C is parallel to the heat shrink direction, the end of the region 1a is higher and easier to stand up, and the steam is smoothly discharged to the outside through the gap between the fastening sheet C and the outer surface of the container B. And on the external appearance of the package D, it seems that the vapor | steam has come out from the both-sides edges C1 and C2 of the fastening sheet | seat C in the both sides of the vapor permeation label A. FIG.

  As described above, the package D using the vapor transmission label A of the present invention generates the steam escape port 71 in the cut line 3 due to heat by steam, so that the container B can be used before the internal pressure becomes very high during the microwave treatment. The steam inside can be escaped. For this reason, the package D of the present invention is difficult to blow out the contents together with the steam, and the amount is reduced even when the contents are blown out.

The present invention is not limited to the first embodiment and can be variously modified.
Hereinafter, various other embodiments of the present invention will be described, but the description of the same configurations and effects as those of the first embodiment will be omitted (assuming that the description has been made), and the terms and symbols will be used as they are.

[Second Embodiment]
In the first embodiment, the belt-like fastening sheet C is attached so as to cover the entire surface of the vapor transmission label A. For example, as shown in FIG. You may attach to the container B so that the whole line 3 may be covered. In this case, both side edges C1 and C2 in the width direction of the fastening sheet C coincide with or exceed the cut line 3, and the cut line 3 is viewed from a direction perpendicular to the surface of the vapor transmission label A. It cannot be visually recognized (however, a part of the first base material 1 is not covered with the fastening sheet C). Since the fastening sheet C covers the entire cut line 3 in this way, it is possible to reliably prevent external dust or the like from entering the container through the vapor release opening 7 from the cut line 3.

Further, for example, as shown in FIG. 15, at least one side edge C <b> 1 of the both sides C <b> 1 and C <b> 2 in the width direction of the belt-shaped fastening sheet C is a cut line 3 (preferably, a main part 31 of the cut line 3). The fastening sheet C may be attached to the container B so as to cover the cut line 3 of the steaming label A so as to intersect. Preferably, the container C is configured such that both the side edges C1 and C2 in the width direction of the fastening sheet C intersect the cut line 3 so that the fastening sheet C covers the cut line 3 of the vapor transmission label A. Attached to B. By disposing the fastening sheet C in this way, the side edge C1 of the fastening sheet C overlaps with a part of the cut line 3 when viewed from the direction orthogonal to the surface of the vapor transmission label A.
By attaching the fastening sheet C so that the side edge C1 intersects the cut line 3 in this way, the region inside the cut line 3 rises upward at the time of microwave processing, and the end 1a of the region is the fastening sheet C. When the hood is lifted, a relatively large gap is formed between the fastening sheet C and the steaming label A, and the steam is easily discharged.

[Third Embodiment]
As described in the first embodiment, the shape of the cut line in plan view and the arrangement of the plurality of cut lines can be variously set.
Here, some examples not shown in the first embodiment are listed.
FIG. 16 shows a steaming label A in which two score lines 3 are provided. The two cut lines 3 are formed along or in the vicinity of the edge 2a of the second substrate 2. The two score lines 3 are arranged so that they surround the second base material 2.
FIG. 17 shows a steaming label A provided with three score lines 3.
FIG. 18 shows the steaming label A in which the score line 3 is provided in a straight line. The linear score line 3 is preferably extended in the second direction (a direction orthogonal to the heat shrinkage direction). Further, the length of the linear score line 3 is preferably 0.5 to 1.5 times the length of the second base material in the second direction, and is 0.6 to 1.2 times. More preferably.
In FIG. 19, the second base material 2 is formed in a substantially rectangular shape in plan view, and the cut line 3 has a corner portion 33 that bends at two corner portions 2 c of the second base material 2.

[Other Embodiments]
In the said embodiment, although the container B for microwave processing illustrated the internal fitting form which the lid | cover 6 which consists of molded articles fits inside the container main body 5, the lid | cover 6 fits the outer side of the container main body 5 It may be an external fitting type (not shown). In addition, the microwave processing container B is not limited to the type in which the lid 6 is fitted and attached to the container body 5. For example, the sheet-like lid 6 is detachably bonded to the flange portion 51 of the container body 5. It may be in the form (not shown).
The container B for microwave processing used in the present invention has a steam vent opening 7 and is on condition that steam in the container B mainly escapes from the steam vent opening 7 during microwave processing. As the specific structure, various conventionally known structures can be adopted.

  Furthermore, in the said embodiment, as a fastening sheet | seat C for fastening the lid | cover 6 and the container main body 5 of the container B, a belt-like sheet | seat (sheet | seat which becomes strip | belt shape before attaching to a container and becomes a belt | circular ring after attachment) is illustrated. However, the present invention is not limited to this, and a fastening sheet that wraps substantially the entire container B may be used. Such a fastening sheet is generally called an overlap film made of a heat-shrinkable polyethylene film or the like. Even in the case where such an overlap film is used, the film (fastening sheet) is attached to the container B while being in contact with the surface of the second substrate 2 of the vapor transmission label A. Since it is wrapped in a sealed state, it is preferable to form a hole for discharging steam to the outside in a part of the overlap film.

  Further, as described above, the fastening sheet is not limited to the case where it is attached to the container B for the purpose of fastening the lid 6 and the container body 5, and for example, it is attached for the purpose of attaching accessories such as chopsticks and spoons to the container B. It may be.

The package of the present invention can be used, for example, as an instant food container for warming stored food by microwaves.
The steaming label of the present invention can be used, for example, as a label for closing an opening for removing steam from a food container to be microwave-treated.

A Aeration label for microwave treatment B A container for microwave treatment C Fastening sheet D A package for microwave treatment 1 First base material 2 Second base material 2a Edge of second base material 3 Cut line 49 Adhesion part 62 Container Recessed portion 621 Closed space 7 Vapor vent opening

Claims (6)

A microwave processing container having a steam vent opening, a fastening sheet, and a steaming label;
The steaming label has a first base material, and a second base material that is laminated on the surface of the first base material and has a smaller area than the first base material, and the first base material is The second substrate is formed from a sheet having substantially no heat shrinkability, and the second substrate is formed from a sheet having heat shrinkability, and the second substrate is laminated among the first substrates. In the surface of the unfinished area, a cut line with ends is formed,
The steaming label is attached to the container so as to cover the steam vent opening with the first base material,
The microwave processing packaging body, wherein the fastening sheet is attached to the container while being in contact with the surface of the second substrate of the steaming label. The container has a recess, and the opening for vapor release is formed in the recess,
The package for microwave processing according to claim 1, wherein the steaming label is attached so as to form a closed space in cooperation with the concave portion of the container.   The package for microwave processing according to claim 1 or 2, wherein the cut line of the first base material is formed along or in the vicinity of the edge of the second base material.   The package for microwave processing according to any one of claims 1 to 3, wherein the cut lines are formed at two or more independent locations. A score line of the first base material is formed outside an edge of the second base material so as to surround the second base material;
The adhesive part is provided in the area | region other than the area | region enclosed by the said cut line among the back surfaces of the said 1st base material, The said vapor transmission label is adhere | attached on the said container in the said adhesive part. The package for microwave processing as described in any one of thru | or 4. The fastening sheet is a belt ring,
At least a part of the score line is extended non-parallel to the heat shrinkage direction of the second base material, and the belt-shaped fastening sheet is in the heat shrinkage direction of the second base material. The package for microwave processing according to any one of claims 1 to 5, wherein the package is attached around the container so that the longitudinal direction of the fastening sheet is substantially orthogonal.

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