JP2019018906A - Lid body, and production method thereof - Google Patents

Abstract

To provide a lid body which can be used for containers of various shapes for microwave ovens.SOLUTION: A lid body 20 comprises a first film layer made of a resin sheet which covers a container for a microwave oven where contents heated by the microwave oven are filled, and is piled on the container for a microwave oven, and a second film layer made of a resin sheet which is piled on the first film layer and differs from the first film layer. The second film layer has a plurality of slits 22a opened so as to be able to ventilate. The slits 22a are repeatedly formed in a same shape on one axis line CL. A line segment L1 which connects between one end 22b of one slit 22a and the other end 22c of the other slit 22a that presents the same shape as this one slit 22a intersects with the axis line CL.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lid that covers a container for a microwave oven.

  For example, some frozen foods are stored in a microwave container. As a lid for sealing such a microwave oven container, a lid made of a resin film is known. There is a technique disclosed in Patent Document 1 as a conventional technique.

  As shown in Patent Document 1, a lid for a microwave oven container is formed by laminating a plurality of resin films, and a slit is formed in a film excluding the lowermost film. Two slits are formed in a V shape and are provided so that the tips of these V shapes face each other. Such a lid covers the opening of the tray or cup.

  When warming the contents of the microwave oven container, the microwave oven container is placed in the microwave oven without removing the lid, and the microwave oven is operated. As the contents warm up and the pressure inside the microwave oven increases, the slit widens. When the V-shaped tip portions are connected to each other, a hole is formed at the connected portion, and the vapor in the microwave oven container escapes from the hole to the outside.

Japanese Patent No. 4524884

  In general, a container lid is formed by stacking long films and cutting them out according to the size of a microwave container. In the case of forming the lid shown in Patent Document 1, it is conceivable to form slits for each pitch according to the size of the container.

  In such a case, the pitches of the slits are different when creating lids for microwave oven containers having different sizes. For this reason, it is necessary to prepare another film.

  This invention makes it a subject to provide the cover body which can be used for the container for microwave ovens of various shapes.

According to the invention of claim 1, the container for microwave ovens filled with the contents to be heated in the microwave oven is covered,
A first film layer made of a resin sheet stacked on the microwave oven container;
In the lid body provided with a second film layer made of a resin sheet different from the first film layer, overlaid on the first film layer,
The second film layer has a plurality of slits opened to allow ventilation,
These slits are formed by repeatedly forming the same shape on one axis.
A lid is provided in which a segment connecting one end of one slit and the other end of the other slit having the same shape as the one slit intersects the axis. .

As described in claim 2, preferably, the first film layer, the second film material as the material of the second film layer, and a cutter provided with a blade on the outer peripheral surface of a cylindrically formed main body. A preparation process for preparing an apparatus;
A slit forming step of sending the second film material in the vicinity of the rotating cutter device and forming the slit by the blade;
An overlaying step of overlaying the second film layer on which the slit is formed and the first film layer.

  In the invention according to claim 1, the slit is formed by repeatedly forming the same shape on one axis. By repeatedly forming slits having the same shape, the slits are positioned above the opening of the container, even if the containers have different shapes. That is, it is possible to provide a lid that can be used for various types of containers for microwave ovens.

  In addition, a line segment connecting one end of one slit and the other end of another slit having the same shape as the one slit intersects the axis. Examples of the slit in which the same shape is repeatedly formed include perforations formed on one axis. Since the slits repeatedly formed on the axis are short in distance from each other, the slits are easily connected. If the slit is unnecessarily widened, the steam in the microwave oven container escapes more than necessary, and the contents are dried. By forming the slit so that the line segment connecting the ends of the slit intersects the axis, the distance between the adjacent slits can be appropriately separated. As a result, it is possible to remove steam appropriately and warm the contents appropriately.

  In the invention which concerns on Claim 2, a 2nd film raw material is sent to the vicinity of the rotating cutter apparatus, and a slit is formed with a blade. Since the slit is formed by the blade of the rotating cutter device, the same shape can be easily formed repeatedly.

  In addition, the 2nd film layer in which the slit was formed, and the 1st film layer are piled up. By forming the slit before superimposing, it is possible to form the slit only in the second film layer and to prevent the first film layer from being damaged by the slit formation.

It is a perspective view of the cover body and the container for microwave ovens by Example 1 of this invention. FIG. 2 is a sectional view taken along line 2-2 of FIG. FIG. 3 is an enlarged view of part 3 of FIG. 1. It is a figure explaining a preparatory process among the manufacturing methods of the container for microwave ovens shown by FIG. It is a figure explaining the slit formation process among the manufacturing methods of the container for microwave ovens shown by FIG. It is a figure explaining a superposition process among the manufacturing methods of the container for microwave ovens shown in FIG. It is a figure explaining the effect of the container for microwave ovens shown by FIG. It is a principal part enlarged view of the cover body by Example 2 of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<Example 1>

  Please refer to FIG. The upper surface of the microwave oven container 10 filled with the food F (content F) to be heated in the microwave oven is covered with a lid 20.

  The microwave oven container 10 is formed of a heat-resistant resin, and has a substantially rectangular container bottom portion 11, a container wall portion 12 raised from the end portion of the container bottom portion 11, and an upper end of the container wall portion 12. And a container flange portion 13 having a lid 20 bonded to the upper surface thereof.

  Please refer to FIG. The lid 20 includes a first film layer 21 made of a resin sheet that is stacked on the microwave oven container, and a second film layer 22 made of a resin sheet that is stacked on the first film layer 21 and is different from the first film layer 21. It is equipped with. The first film layer 21 and the second film layer 22 are bonded to each other by, for example, dry lamination.

  The first film layer 21 is made of a polyethylene (PE) resin or a polypropylene (PP) resin as a material. More specifically, LLDPE 50 can be employed. The 1st film layer 21 plays the role which does not leak the water | moisture content in the container 10 for microwave ovens outside before cooking in a microwave oven.

  The second film layer 22 is made of polyethylene terephthalate (PET) -based resin or nylon (registered trademark) -based resin. More specifically, PET12 can be employed. The second film layer 22 is made of a material that is more extensible than the first film layer 21.

  Please refer to FIG. The second film layer 22 has a plurality of slits 22a that are opened to allow ventilation. These slits 22a are formed obliquely with respect to one axis line CL. The slits 22a are formed in parallel to each other. That is, the slit 22a is formed by repeatedly forming the same shape on one axis CL.

  The slit 22a may be formed with two different types of shapes alternately. Also in this case, focusing on the slits 22a having the same shape, it can be said that the slits 22a are formed repeatedly on the same axis CL. Furthermore, the slit 22a may include three or more types of shapes.

  A line segment L1 connecting one end 22b of one slit 22a and the other end 22c of the slit 22a adjacent to the one slit 22a intersects the axis CL. That is, a line segment L1 connecting one end 22b of one slit 22a and the other end 22c of another slit 22a having the same shape as the one slit 22a intersects the axis line CL.

  The slit 22a has, for example, a width W of 2.1 mm, an interval (pitch) P between adjacent slits 22a of 1.03 mm, and an angle θ that is inclined with respect to the axis CL is 15 °.

  Please refer to FIG. Some slits 22 a are located above the container flange portion 13.

  The axis CL passes through the center of the microwave oven container 10 (a position where two diagonal lines intersect) with respect to the state when the microwave oven container 10 is viewed from above, and has a substantially rectangular microwave oven container. It extends along the 10 long sides.

  The axis CL may be formed along a diagonal line of the substantially rectangular microwave container 10 with reference to the state of the microwave container 10 viewed from above. The axis CL preferably passes through the center of the microwave oven container 10 with reference to the state of the microwave oven container 10 viewed from above. By forming the axis line CL on the center that expands most during heating, the steam can be surely extracted.

  The action of the lid 20 when the food F is warmed in the microwave will be described.

  When the food F is warmed, the microwave oven container 10 is put into the microwave oven without removing the lid 20. When the microwave oven is activated, the food F is heated. By being heated, the moisture contained in the food F becomes water vapor. When the food F is further heated, the pressure in the microwave oven container 10 rises and the first film layer 21 bursts.

  Please refer to FIG. The 2nd film layer 22 softens with the heat by which the food F was heated. When the first layer film 21 expands in this state, the slit 22a is torn. Thereby, the water vapor in the microwave oven container 10 escapes to the outside.

  Until it is warmed in the microwave oven, the microwave oven container 10 is sealed by the first film layer 21. For this reason, the sanitary state of the food F can be kept favorable until it is heated in the microwave oven after the food F is filled and the lid 20 is attached. In addition, moisture is prevented from leaking during transportation.

  On the other hand, at the time of heating by a microwave oven, a hole is opened in the lid 20 and water vapor is released from the hole. Thereby, the inside of the container 10 for microwave ovens is prevented from becoming an excessively high pressure. A method for manufacturing such a lid 20 will be described with reference to FIGS.

  Please refer to FIG. First, a first film layer 21, a second film material 25 as a material of the second film layer 22, and a cutter device 30 provided with a blade 32 on the outer peripheral surface of a cylindrical body 31 are prepared. (Preparation process).

  Please refer to FIG. Next, the cutter device 30 is rotated. The 2nd film raw material 25 is sent to the vicinity of the rotating cutter apparatus 30, a hole is made in the 2nd film raw material 25 with the blade 32, and the slit 22a is formed (slit formation process).

  Please refer to FIG. The 2nd film layer 22 in which the slit 22a was formed, and the 1st film layer 21 are piled up (superposition process). At this time, pressure is applied to the first film layer 21 and the second film layer 22 by the heated rollers 41 and 41. The first film layer 21 and the second film layer 22 are bonded to each other through an adhesive previously applied to the first film layer 21 and / or the second film layer 22.

  The lid 20 formed in a long shape is cut out in a size that matches the microwave oven container 10 (see FIG. 1) and is bonded to the microwave oven container 10.

  The present invention described above has the following effects.

  Refer to FIG. 7A and FIG. The slit 22a is formed by repeatedly forming the same shape on one axis CL. By repeatedly forming the slits 22a having the same shape, the slits 22a are positioned above the openings of the microwave oven containers 10 and 10A even in the microwave oven containers 10 and 10A having different shapes. That is, it is possible to provide a lid that can be used for the microwave oven containers 10 and 10A having various shapes.

  Please refer to FIG. A line segment L1 connecting one end 22b of one slit 22a and the other end 22c of another slit 22a having the same shape as the one slit 22a intersects the axis CL. The slit 22a in which the same shape is repeatedly formed includes a perforation formed on one axis CL. Since the distance between the end portions of the perforation is short, the slits are easily connected. When the slits are unnecessarily widened, the vapor in the microwave oven container 10 (see FIG. 2) escapes more than necessary, and the contents are dried. By forming the slit 22a so that the line segment L1 connecting the ends of the slit 22a intersects the axis CL, the distance between the adjacent slits 22a can be appropriately separated. As a result, the steam can be extracted moderately and the food F can be warmed appropriately.

  Reference is made to FIG. 5A and FIG. The second film material 25 is fed to the vicinity of the rotating cutter device 30, and the slit 22 a is formed by the blade 32. Since the slit 22a is formed by the blade 32 of the rotating cutter device 30, the same shape can be easily formed repeatedly.

Please refer to FIG. The 2nd film layer 22 in which the slit 22a was formed, and the 1st film layer 21 are piled up. By forming the slit 22a before overlapping, the slit 22a can be formed only in the second film layer 22, and the first film layer 21 can be prevented from being damaged by the formation of the slit 22a.
<Example 2>

  Next, a second embodiment of the present invention will be described with reference to the drawings.

  FIG. 8 shows a lid 20A according to the second embodiment. In the lid 20A according to the second embodiment, the slit 22aA is formed in a substantially S shape. Other basic configurations are the same as those of the lid 20 according to the first embodiment. About the part which is common in Example 1, while using a code | symbol, detailed description is abbreviate | omitted.

  The lid 20A according to the second embodiment also exhibits the predetermined effect of the present invention.

  In addition, as long as there exists an effect | action and effect of this invention, this invention is not limited to an Example.

  The lid of the present invention is suitable for a lid of a container containing frozen food.

DESCRIPTION OF SYMBOLS 10, 10A ... Container 20, 20A ... Lid 21 ... 1st film layer 22 ... 2nd film layer 22a, 22aA ... Slit 22b ... (Slit) one end 22c ... (Slit) other end 25 ... Second Film material 30 ... Cutter device 31 ... Main body 32 ... Blade F ... Food (content)
CL ... Axis line L1 ... Line segment

Claims (2)

Cover the microwave container filled with the contents to be heated in the microwave,
A first film layer made of a resin sheet stacked on the microwave oven container;
In the lid body provided with a second film layer made of a resin sheet different from the first film layer, overlaid on the first film layer,
The second film layer has a plurality of slits opened to allow ventilation,
These slits are formed by repeatedly forming the same shape on one axis.
A lid connecting one end of one slit and the other end of the other slit having the same shape as the one slit intersects the axis. In the manufacturing method of the lid according to claim 1,
A preparation step of preparing the first film layer, the second film material as the material of the second film layer, and a cutter device provided with a blade on the outer peripheral surface of the main body formed in a cylindrical shape;
A slit forming step of sending the second film material in the vicinity of the rotating cutter device and forming the slit by the blade;
The manufacturing method of the cover body characterized by including the said 2nd film layer in which the said slit was formed, and the superimposition process which superimposes the said 1st film layer.

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