JP2017114538A - Sealing tape for gas release gap in microwave heating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing tape for a gas release gap in a microwave heating container, the tape having a contamination prevention function, an opening confirmation function and a resealing function.SOLUTION: A sealing tape for a gas release gap in a microwave heating container is provided. The sealing tape is characterized as follows: the sealing tape comprises a transparent tape base material, an easy release layer partially stacked on the transparent tape base material, a print layer stacked on the top of the transparent tape base material and the easy release layer, and an adhesive layer stacked on the print layer; the easy release layer is configured to be peeled off from the transparent tape base material or the print layer, or deformed when the adhesive layer is made to adhere on the gas release gap and peeled off; and the adhesive layer is made to adhere to the gas release gap again after being peeled off, and can seal the gas release gap.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing tape for a gas discharge gap in a microwaveable container having a foreign matter mixing prevention function, an opening confirmation function, and a reseal function.

  For the purpose of reducing environmental impact, containers such as lunch boxes and side dishes sold at food departments such as supermarkets are fitted with the upper lid from the wrap wrapping that covers the entire main body of the container and the upper lid. In such a state, a tape packaging in which an adhesive tape is applied so that the upper lid does not come off from the container body and a side shrink packaging in which a joint portion between the upper lid and the container body is covered with a film are employed.

  Containers for tape packaging and side shrink packaging are generally those that can be heated in a microwave oven, and air generated by steam or fermentation during microwave heating escapes, and a gap for adjusting the internal pressure is provided on the top lid. It is provided in a part. Conventionally, an adhesive tape that adheres both ends for the purpose of preventing foreign matter from being mixed is provided in the gap portion. However, since such an adhesive tape is compressed from above across the gap portion, There was a problem that escape and internal pressure could not be adjusted sufficiently.

  In order to overcome such a problem, a notch valve formed in the recess and a minute steam vent groove formed in the peripheral edge of the recess are provided as the gas discharge gap portion of the upper lid, and the recess and the steam vent groove are provided. Proposing a lunch box that can be heated in a microwave oven with good gas release from the outer periphery of the steam vent groove by sticking a sticking label so that the outer peripheral portion of the steam vent groove is not covered (See Patent Document 1).

  However, in the lunch container of Patent Document 1, since the sticking label does not cover a part of the outer peripheral portion of the vapor vent groove, the gap portion cannot be completely sealed, and foreign matter is mixed or accumulated in the uncovered portion. Easy and hygienic. In addition, this label is not supposed to be peeled off by users or third parties in the first place, and it is sealed again to prevent the container contents from flowing out and to ensure safety after peeling the label from the gap. There is a problem that the adhesiveness cannot be sufficiently maintained when it is desired to seal the void portion again. Furthermore, this sticking label cannot be confirmed to be opened, and there is a problem that it is difficult to distinguish from the outside even if the sticking label is illegally peeled to expose the void and reseal.

JP 2009-28325 A

  The present invention was devised in order to solve the problems of the prior art, and its purpose is to provide a gas discharge void of a microwaveable container having a foreign matter prevention function, an opening confirmation function, and a reseal function. It is to provide a sealing tape, and a microwaveable container that can be completely covered with a gas discharge gap. Specifically, foreign matter is mixed into the gas discharge gap of the upper lid before heating the microwave oven. It is an object of the present invention to provide a device capable of achieving complete prevention and easy discrimination of tampering of the sealing tape, and resealing of the gas discharge gap after peeling of the sealing tape (after heating in the microwave oven).

  As a result of diligent investigations to achieve the above-mentioned object, the present inventor has completely covered the gas discharge gap as a sealing tape for the gas discharge gap of the microwaveable heatable container and completely sealed it before heating the microwave oven. Prevents foreign matter from entering, peels off for gas release during microwave heating, can be resealed if necessary after microwave heating, and easily checks for unauthorized opening before microwave heating By adopting such a configuration, it has been found that a foreign matter mixing prevention function, an opening confirmation function, and a resealing function can be effectively achieved by simple means, and the present invention has been completed.

That is, the present invention has the following configurations (1) to (6).
(1) A sealing tape for a gas discharge gap in a microwaveable heatable container, wherein the sealing tape is a transparent tape substrate, an easily peelable layer partially laminated on the transparent tape substrate, and a transparent tape It includes a printed layer laminated on a substrate and an easily peelable layer, and an adhesive layer laminated on the printed layer, and is easy to peel off after sticking the adhesive layer on the gas release gap. The release layer is configured to be peeled off or deformed from the transparent tape substrate or the printed layer, and after the pressure-sensitive adhesive layer has been peeled off, the release layer is adhered to the gas release gap again to form the gas release gap. A sealing tape, which can be sealed.
(2) A sealing tape for a gas discharge gap in a microwaveable heatable container, wherein the sealing tape is a transparent tape base material, an easily peelable layer partially laminated on the transparent tape base material, and a transparent tape The adhesive layer laminated on the base material and the easy-release layer, and the easy-release layer is peeled off from the transparent tape base material or the adhesive layer when the adhesive layer is peeled after being stuck on the gas release gap. It is configured to be peeled off or deformed, and the pressure-sensitive adhesive layer can be adhered to the gas discharge gap again after being peeled to seal the gas discharge gap. Sealing tape.
(3) The sealing tape according to (1) or (2), wherein a covering layer that covers the pressure-sensitive adhesive layer is provided on the end of the pressure-sensitive adhesive layer as a non-adhesive portion that can be gripped.
(4) Any one of (1) to (3) is characterized in that printing for information display is performed on a surface opposite to the laminated surface of the easily peelable layer of the transparent tape substrate. Sealing tape of description.
(5) The sealing tape according to any one of (1) to (4), wherein the pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive.
(6) A microwave oven-heatable container comprising a container body and an upper lid that covers the opening of the container body and has a gas discharge gap from the container, wherein the container is any one of (1) to (5) A microwaveable heatable container, wherein the pressure-sensitive adhesive layer of the sealing tape is stuck so as to completely cover the gas discharge gap.

  Since the sealing tape of the present invention completely covers the gas discharge gap of the microwaveable container, there is no contamination or accumulation of foreign matter in the gas discharge gap, and the sealing tape of the present invention is used. The container that can be heated in a microwave oven is extremely excellent in hygienic conditions.

  In addition, the sealing tape of the present invention is configured so that the easy-release layer peels off or deforms from the transparent tape substrate or the printing layer or the adhesive layer when the adhesive layer is attached and then peeled off, Even if it is tampered with, the appearance disorder due to peeling or deformation of the easily peelable layer can be easily observed from the transparent tape substrate side, and the microwave oven-heatable container employing the sealing tape of the present invention is a good tamper opening. Can have a confirmation function.

  Furthermore, since the sealing tape of the present invention can be sealed by adhering again to the gas discharge gap after the pressure-sensitive adhesive layer is peeled off, the microwaveable heatable container employing the sealing tape of the present invention is Even after heating in a microwave oven, it is possible to easily prevent the outflow of container contents and achieve safety.

FIG. 1 is a schematic perspective view of an example of a microwaveable container using the sealing tape of the present invention. FIG. 2 is a schematic cross-sectional view of the microwaveable heatable container of FIG. 1 as viewed from the side. FIG. 3 is a schematic cross-sectional view of the first embodiment of the sealing tape of the present invention. FIG. 4 is a schematic cross-sectional view of an example in which a non-adhesive portion that can be gripped is further provided in the first embodiment of the sealing tape of the present invention. FIG. 5 is a schematic cross-sectional view of a second embodiment of the sealing tape of the present invention. FIG. 6 is a schematic cross-sectional view of an example in which a non-adhesive portion that can be gripped is further provided in the second embodiment of the sealing tape of the present invention.

  The sealing tape of the present invention and the microwaveable container that can be heated will be described below with reference to the drawings, but the present invention is not limited thereto.

  The sealing tape of the present invention is for sealing a gas discharge gap of a microwaveable container, a function for preventing foreign matter from being mixed into the gas discharge gap, an unauthorized opening confirmation function before heating the microwave, and a microwave oven. It has a resealing function after heating. As the microwaveable heatable container of the present invention, a conventionally known container can be used as long as there is a gas discharge gap. For example, as shown in FIGS. 1 and 2, the lower container body 1 and the container It comprises an upper lid 2 that covers the opening of the main body 1 from above and is fitted or coupled to the container main body 1 at the side, and the upper lid 2 is provided with a gas discharge gap 3 for releasing gas when heating the microwave oven. Are listed. The microwaveable container generally contains food such as lunch box contents, side dishes, cooked rice, noodles, and meat.

  The sealing tape 4 of the present invention is adhered to the gas discharge gap 3 from the pressure-sensitive adhesive layer side so as to completely cover the gas discharge gap 3 of the upper lid 2 at the time of manufacturing the microwave heatable container, and the microwave oven heatable container Until the user uses the gas release gap 3 to prevent foreign matter from mixing, and when heating the microwave oven, the sealing tape of the present invention is peeled to expose the gas emission gap 3 from which the gas during the microwave oven heating is removed. After discharge and heating in the microwave, if necessary, the gas discharge gap 3 is resealed with the sealing tape of the present invention to ensure the outflow and safety of the contents. In addition, the sealing tape of the present invention can be easily used due to a change in appearance due to peeling or deformation of the easy-release layer when the microwaveable container is tampered with until the user uses it (that is, before heating the microwave oven). This can be determined. Hereafter, typical embodiment of the sealing tape of this invention is shown.

(First embodiment)
FIG. 3 shows a schematic cross-sectional view of the first embodiment of the sealing tape of the present invention. In FIG. 3, 5 is a transparent tape substrate, 6 is an easy release layer partially laminated on the transparent tape substrate 5, and 7 is a transparent tape substrate 5 and an easy release layer 6. 8 is a pressure-sensitive adhesive layer laminated on the printing layer 7.

  As the transparent tape substrate 5, it is preferable to use a transparent film formed from a thermoplastic resin having dimensional stability. For example, a conventionally known transparent film such as a polypropylene film, a polyethylene film, a polyester film, a polyamide film, or a polystyrene film is used. A tape substrate can be employed. The thickness of the transparent tape base material 5 is 12-150 micrometers, for example, Preferably it is 25-50 micrometers. The size of the transparent tape substrate 5 is sufficient if it has an area that completely covers the gas discharge gap 3. The shape of the transparent tape substrate 5 may be a rectangle such as a rectangle or a square, a rounded corner or a circle. Can be adopted.

  The easy release layer 6 is a layer adjacent to the easy release layer 6 when the adhesive layer 8 of the sealing tape 4 is attached to the adherend (gas release gap 3) and then peeled off from the adherend (in FIG. 3). Layer that is easily peeled off from the transparent tape substrate 5 or the printed layer 7, in FIG. 5 to be described later, or is easily deformed to change the entire shape thereof. It is. When the easy-peeling layer 6 is peeled off from the adjacent layer or the easy-peeling layer itself is deformed, it can be confirmed that the sealing tape 4 has been opened when viewed from the transparent tape substrate 5 side due to the change in appearance. . At this time, when the easy peelable layer 6 is viewed (seen from the transparent tape base material 5 side), when it is formed (printed) so as to be in the shape of a symbol, character or symbol that means opening, the part that has changed to the already opened state It can be easily recognized by the shape of In order for the easily peelable layer 6 to be peeled off or deformed as described above, the easily peelable layer 6 and a layer adjacent to the easily peelable layer 6 or the adjacent layer (in FIG. The adhesive strength between the printing layer 7 and the transparent tape substrate 5 or the pressure-sensitive adhesive layer 8) in FIG. 5 is weak, or the inside of the easily peelable layer 6 is broken due to the adhesive strength between the adherend and the pressure-sensitive adhesive layer 8. The strength needs to be weak. As a means for this, a method of weakening the adhesive force by incorporating a conventionally known release agent such as a silicone compound or a fluorine compound into the resin (ink) component that forms the easy release layer 6 can be employed. The thickness of the easy peeling layer 6 is 0.1-5 micrometers, for example, Preferably it is 0.3-3 micrometers.

  The printing layer 7 is colored transparent per se, or a layer on which characters, symbols or designs are printed, and the state can be easily grasped from the transparent tape substrate 1 side when the easy peeling layer 6 is peeled off or deformed. Layer. The material of the printing layer 7 is not particularly limited, and can be formed from a conventionally known colored ink or resin, and coloring and printing can also be formed by a conventionally known method. For example, the printing layer 7 is formed by gravure printing a solvent-type coloring ink and then drying and curing. The thickness of the printing layer 7 is, for example, 0.1 to 5 μm, preferably 0.3 to 3 μm.

  The pressure-sensitive adhesive layer 8 is adhered so as to completely cover the adherend (gas release gap 3). For example, a rubber-based pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive, an epoxy-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, etc. Conventionally known pressure-sensitive adhesives are used. Preferably, a rubber adhesive made of natural rubber or synthetic rubber is used. The pressure-sensitive adhesive layer 8 needs to have sufficient adhesive strength to completely seal the gas discharge gap 3. Moreover, the adhesive layer 8 is required to have an adhesive force that does not leave any adhesive residue when peeled, and has sufficient adhesiveness to seal the gas release gap 3 when resealed. Specifically, the adhesive strength of the pressure-sensitive adhesive layer 8 is, for example, 0.5 to 6.0 N / 10 mm, preferably 1.0 to 5.0 N / 10 mm at the time of first sticking, and at the time of re-sticking. For example, 0.3 to 5.0 N / 10 mm, preferably 0.5 to 4.0 N / 10 mm. The thickness of the pressure-sensitive adhesive layer 8 is, for example, 2 to 70 μm, preferably 10 to 50 μm.

  The sealing tape of the present invention can be laminated with the above-described layers on the transparent tape substrate 5, for example, a transparent tape substrate having a predetermined thickness and size necessary to cover the gas discharge gap. 5 is prepared, and the easy-peeling layer 6, the printing layer 7, and the pressure-sensitive adhesive layer 8 are sequentially applied by a conventionally known method.

  FIG. 4: shows the schematic sectional drawing of the example which provided the non-adhesive part which can be hold | gripped in 1st embodiment of the sealing tape of this invention in the edge part. In the sealing tape of FIG. 4, a portion where the coating layer 9 is laminated (applied) is provided at the end portion (right end in FIG. 4) of the pressure-sensitive adhesive layer 8 to kill the function of the pressure-sensitive adhesive layer 8. It is said. The covering layer 9 needs to be configured by selecting a material whose surface on the adherend side does not substantially have adhesiveness. The coating layer 9 is selected according to the material of the pressure-sensitive adhesive layer 8, and conventionally known materials such as a fluorine compound, silicone, a long-chain alkyl polymer, and a UV curable ink can be used. The thickness of the coating layer 9 is, for example, 0.1 to 5 μm, preferably 0.3 to 3 μm. By forming this non-adhesive portion 10, the sealing tape of the present invention can be easily peeled off from the gas discharge gap 3 or adhered thereto by gripping this portion. In the sealing tape of the embodiment of FIG. 4, it is preferable that the gas release gap 3 is completely covered only by the portion where the pressure-sensitive adhesive layer 8 is laminated (applied) or the exposed portion. In addition, it is also possible to provide a portion where the adhesive layer 8 is not laminated (coated) at the end of the printing layer 7 of the sealing tape of FIG.

  In the first embodiment of the sealing tape of the present invention, an undercoat layer can be provided between the printing layer 7 and the pressure-sensitive adhesive layer 8. The undercoat layer is provided to improve the adhesiveness between the printed layer 7 and the pressure-sensitive adhesive layer 8 and is appropriately selected from conventionally known materials. By forming this undercoat layer, it is possible to prevent interfacial peeling between the printed layer and the pressure-sensitive adhesive layer when the sealing tape of the present invention is peeled from the adherend.

  In the first embodiment of the sealing tape of the present invention, printing for information display can be performed on the surface of the transparent tape substrate 5 opposite to the laminated surface of the easily peelable layer 6. Printing can be performed with conventionally known materials and methods, but it is necessary that the easy-release layer 6 and the print layer 7 be visible. Printing can be accomplished, for example, by printing desired information with UV curable ink and UV curing. The printed information display can be, for example, how to use the sealing tape.

(Second embodiment)
FIG. 5 shows a schematic cross-sectional view of a second embodiment of the sealing tape of the present invention. In FIG. 5, 5 is a transparent tape substrate, 6 is an easy release layer partially laminated on the transparent tape substrate 5, and 8 is a transparent tape substrate 5 and an easy release layer 6. It is the adhesive layer laminated | stacked on. As the transparent tape substrate 5, the easily peelable layer 6, and the pressure-sensitive adhesive layer 8 used in the sealing tape of FIG. 5, the same one as that of the sealing tape used in FIG. 3 can be used. The sealing tape of 2nd embodiment of FIG. 5 differs in the point which does not provide the printing layer 7 from the sealing tape of 1st embodiment of FIG. Also in the second embodiment of FIG. 5, the coating layer 9 can be provided as the non-adhesive portion 10 that can be gripped as shown in FIG. 6. Also in the second embodiment of FIG. 5, printing for information display can be performed as described above.

  Prepare a container that can be heated in a microwave oven as shown in FIG. 1 and FIG. 2, put the food for the inner lunch box of the curtain into the container body 1, fit the container body 1 and the upper lid 2 at the side part, and wrap the side part by side shrink wrapping. Sealed.

On the other hand, four sealing tapes as shown in FIGS. Specifically, the transparent tape base material 5 was prepared and laminated | stacked by laminating | stacking (application | coating) the material of each layer shown below in order. Details of the materials and thickness used are as follows. The easy peeling layer 6 was formed so that the characters “VOID” could be seen from above after the sealing tape was peeled from the microwaveable container. The printing layer 7 was formed by gravure printing before the next layer was laminated (coated).
Transparent tape substrate 5: polyester film; 38 μm
Easy peeling layer 6: Silicone compound-containing transparent ink; 1 μm
Printing layer 7: Solvent type colored ink; 1 μm
Adhesive layer 8: natural rubber-based adhesive; 35 μm
Coating layer 9: Fluorine compound; 1 μm

  The four sealing tapes produced as described above as shown in FIGS. 3 to 6 were stuck from the pressure-sensitive adhesive layer 8 side so as to completely cover the gas discharge gap 3 of the microwaveable heatable container. Thereafter, when the sealing tape was completely peeled off, peeling of the easy peeling layer 6 could be observed from the outside, and the letters “VOID” were seen from above. When the microwaveable heatable container with the sealing tape completely removed was warmed so that the contents were edible, it was observed that vapor was released from the gas discharge gap. Thereafter, when the removed sealing tape was again adhered to the gas discharge gap from the pressure-sensitive adhesive layer 8 side, it was sufficiently adhered and it was confirmed that the gas discharge gap was sealed. In addition, the sealing tape as shown in FIG.4 and FIG.6 was easy to peel by a finger | toe by holding a non-adhesive part.

  Since the sealing tape of the present invention has a foreign matter mixing prevention function, an opening confirmation function, and a reseal function, it is extremely suitable for sealing the gas discharge gap 3 of the microwaveable container.

DESCRIPTION OF SYMBOLS 1 Container body 2 Upper lid 3 Gas discharge space 4 Sealing tape 5 Transparent tape base material 6 Easy peelable layer 7 Print layer 8 Adhesive layer 9 Covering layer 10 Non-adhesive part

Claims (6)

  A sealing tape for a gas discharge gap of a microwaveable heatable container, wherein the sealing tape comprises a transparent tape base material, an easy peeling layer partially laminated on the transparent tape base material, a transparent tape base material, and It includes a printed layer laminated on an easily peelable layer and an adhesive layer laminated on the printed layer, and the easy peelable layer is peeled off after sticking the adhesive layer on the gas release gap. It is configured to be peeled off or deformed from the transparent tape substrate or the printing layer, and after the pressure-sensitive adhesive layer has been peeled off, it is adhered to the gas discharge gap again to seal the gas discharge gap. A sealing tape, characterized in that it is possible.   A sealing tape for a gas discharge gap of a microwaveable heatable container, wherein the sealing tape comprises a transparent tape base material, an easy peeling layer partially laminated on the transparent tape base material, a transparent tape base material, and Whether the easy-release layer peels off from the transparent tape substrate or the adhesive layer when the adhesive layer is peeled off after sticking the adhesive layer on the gas release gap. Alternatively, the sealing is characterized in that it is configured to be deformed and the pressure-sensitive adhesive layer can be adhered to the gas discharge gap again after being peeled to seal the gas discharge gap. tape.   The sealing tape according to claim 1, wherein a covering layer that covers the pressure-sensitive adhesive layer is provided on an end portion of the pressure-sensitive adhesive layer as a non-adhesive portion that can be gripped.   The sealing tape according to any one of claims 1 to 3, wherein printing for information display is performed on a surface opposite to the laminated surface of the easy-peeling layer of the transparent tape substrate.   The sealing tape according to claim 1, wherein the pressure-sensitive adhesive layer is composed of a rubber-based pressure-sensitive adhesive.   It is a microwaveable heatable container which consists of a container main body and the upper cover which covers the opening part of a container main body, and has the space | gap for gas discharge | release from a container, Comprising: The adhesive of the sealing tape in any one of Claims 1-5 A microwaveable heatable container, characterized in that the layer is stuck so as to completely cover the gas discharge gap.

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