JP2021084189A - Manufacturing method and manufacturing apparatus of plastic material for content storage container - Google Patents

Abstract

To form an open hole having a stable shape into a plastic material.SOLUTION: An ultrasonic wave application device 50 has a tool horn 52 abutting on plastic materials 10, 30 placed on a cutting jig 41 through a metal plate 45, for applying an ultrasonic wave to the metal plate 45, and a vibrator 51 connected to the tool horn 52, for applying ultrasonic vibration to the tool horn 52. In the ultrasonic wave application device 50, an ultrasonic wave is applied from the tool horn 52, and an open hole is formed in the plastic materials 10, 30 between itself and the cutting jig 41 having a cutting blade 42.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a method for manufacturing a plastic material for a content storage container such as a microwave-heated food container and a manufacturing apparatus, and in particular, a method for manufacturing a plastic material for a content storage container in which a through hole can be easily formed. And manufacturing equipment.

Conventionally, as a container for microwave-heated food, a container having a container body and a lid has been known. In addition, a microwave oven using microwaves is usually used for cooking and reheating foods. In this case, the food is stored in the microwave oven-heated food container in advance, and the microwave oven-heated food container containing the food is put in the microwave oven and heated as it is. Microwave oven When a food container is cooked in a microwave oven, water vapor may be generated from the food in the container.

In order to release the water vapor generated from the food to the outside in this way, a plurality of through holes are formed in the lid of the microwave oven-heated food container. Then, in order to form a plurality of through holes in the lid, a technique has been developed in which a laser beam is used to melt the lid to form through holes.

However, when forming a through hole in the lid using a laser beam, a large-scale laser beam irradiation device is required. Further, when a through hole is formed in the lid by a laser beam, the shape of the through hole is not stable depending on the irradiation amount and irradiation time of the laser beam, and in particular, the peripheral shape of the through hole may be uneven in a plan view.

Japanese Unexamined Patent Publication No. 2018-11536

The present invention has been made in consideration of such a point, and a method and an apparatus for manufacturing a plastic material for a content storage container capable of stabilizing the shape of the through hole and adjusting the peripheral shape of the through hole. The purpose is to provide.

In the present disclosure, in a method for manufacturing a plastic material for a content storage container, a step of bringing one surface of the plastic material into contact with a cutting jig and an ultrasonic wave from an ultrasonic applying device to the other surface of the plastic material. Is a method for producing a plastic material for a content storage container, which comprises a step of forming a through hole in the plastic material with the cutting jig.

The present disclosure is a method for producing a plastic material for a content storage container, which applies ultrasonic waves to the other surface of the plastic material via a metal plate.

According to the present disclosure, in a plastic material manufacturing apparatus for a content storage container, a cutting jig that abuts on one surface of the plastic material and an ultrasonic wave are applied to the other surface of the plastic material to apply the cutting jig. It is a plastic material manufacturing apparatus for a content storage container, which is provided with an ultrasonic wave applying device for forming a through hole in the plastic material.

The present disclosure is a plastic material manufacturing device for a content storage container in which a metal plate is interposed between the ultrasonic wave applying device and the other surface of the plastic material.

According to the present disclosure, the shape of the through hole of the plastic material for storing the contents can be stabilized and the peripheral shape of the through hole can be adjusted.

FIG. 1 is a diagram showing a method of manufacturing a plastic material for a content storage container according to an embodiment of the present disclosure. FIG. 2 is a diagram showing another embodiment of a method for manufacturing a plastic material for a content storage container. FIG. 3 is an exploded perspective view showing a microwave oven-heated food container as a content storage container. FIG. 4 is a cross-sectional view showing a container for microwave-heated food.

Hereinafter, a method and an apparatus for manufacturing a plastic material for a content storage container according to the present disclosure will be described with reference to the drawings.

First, the outline of the content storage container, for example, the microwave oven-heated food container 1, will be described with reference to FIGS. 3 and 4. Such a container for heated food in a microwave oven includes a container body 20 having an opening 21 and a lid 10 covering the opening 21 of the container body 20, and the opening step 27 and the lid of the container body 20 described later. An inner lid 30 is interposed between the peripheral wall portion 15 and the peripheral wall portion 15.

Further, the lid body 10 has a lid surface 11, and an exhaust elongated hole (through hole) 12 is formed in the lid surface 11. As shown in the drawing, a plurality of exhaust elongated holes 12 are provided, and a plurality of these exhaust elongated holes 12 are gathered to form an exhaust elongated hole group 12A. Further, a plurality of exhaust elongated holes (through holes) 32 are also formed in the inner lid 30, and an exhaust elongated hole group 32A is formed by the plurality of exhaust elongated holes 32. When heating or heating with a microwave oven, water vapor generated from food (not shown) contained in the container body 20 passes through the exhaust elongated holes 32 of the inner lid 30 and the exhaust elongated holes 12 of the lid 10. It is exhausted to the outside of the microwave oven-heated food container 1. Since a plurality of exhaust elongated holes 32 are formed to form an exhaust elongated hole group 32A and a plurality of exhaust elongated holes 12 are formed to form an exhaust elongated hole group 12A, the inside of the container body 20 is efficiently formed. Water vapor can be exhausted.

Further, the lid body 10 is fitted to the container body 20. In this case, a peripheral wall portion 15 having a U-shaped cross section that fits with the opening 21 of the container body 20 is provided around the lid body 10.

On the other hand, the container body 20 is provided with an opening step 27 in the opening 21, and the peripheral wall portion 15 of the lid 10 enters the opening step 27. Further, the container body 20 has a body portion 24 and a bottom portion 25 having an opening 21 formed therein. The container body 20 and the lid 10 of the microwave oven-heated food container 1 shown in FIGS. 3 and 4 have a circular shape in a plan view, but may have a polygonal or elliptical shape in a plan view.

The microwave cooked food container 1 is mainly used for lunches, prepared foods, noodle dishes, etc. sold at convenience stores, supermarkets, department stores, restaurants, delicatessen stores, coffee shops, service areas, and the like. It is a container used for packaging soup dishes and foods including various beverages such as coffee, cocoa, tea, green tea, and herbal tea.

Next, the container body 20 and the lid 10 will be further described with reference to FIGS. 3 and 4. As shown in FIGS. 3 and 4, the peripheral wall portion 15 of the lid has an outer wall portion 16, a peripheral groove bottom portion 17, and an inner side wall portion 18. A flange portion 19 is provided on the outer edge of the outer wall portion 16. On the other hand, a flange portion 29, an opening peripheral wall portion 26, and an opening step portion 27 are formed in the opening 21 of the container body 20, and the peripheral wall portion 15 of the lid 10 is the opening step of the container body 20 as described above. It enters the portion 27 and fits into the outer wall portion 16.

Further, as shown in FIG. 4, when the peripheral wall portion 15 of the lid 10 is fitted into the opening 21 of the container body 20 via the inner lid 30, the outer wall portion 16 is in close contact with the opening peripheral wall portion 26. The airtightness inside the microwave oven-heated food container 1 is enhanced. At this time, the water vapor generated inside is discharged to the outside of the microwave oven-heated food container 1 from the exhaust elongated holes 32 formed in the inner lid 30 and the exhaust elongated holes 12 formed in the lid surface 11 of the lid 10. Will be done. In this way, the problem that the microwave oven-heated food container 1 expands abnormally and the lid is deformed or unnaturally opened is avoided.

Next, the material of each member will be described. As the container body 20 of the microwave-heated food container 1, general stretched polystyrene (OPS), transparent polypropylene (transparent PP), expanded polypropylene (expanded PP), or polypropylene filler (PPF) containing a filler in polypropylene is used. be able to.

Further, as the inner lid 30, general stretched polystyrene (OPS), transparent polypropylene (transparent PP), heat-resistant polypropylene (PPnatural), or polypropylene filler (PPF) can be used.

Further, as the lid 10, general stretched polystyrene (OPS), transparent polypropylene (transparent PP), and expanded polypropylene (expanded PP) can be used.

The thickness of the container body 20 is 0.1 to 4.0 mm, the thickness of the inner lid 30 is 0.1 to 4.0 mm, and the thickness of the lid 10 is 0.1 to 4.0 mm.

The exhaust elongated hole 12 of the lid 10 has a length of 0.1 to 15.0 mm and a width of 0.05 to 12.0 mm.

The exhaust elongated hole 32 of the inner lid 30 has a length of 0.1 to 15.0 mm and a width of 0.05 to 12.0 mm.

Next, with reference to FIG. 1, a method for forming a plurality of exhaust elongated holes 12 of the lid 10 and a plurality of exhaust elongated holes 32 of the inner lid 30 will be described.

The exhaust elongated hole 12 of the lid 10 and the exhaust elongated hole 32 of the inner lid 30 are formed by using the plastic material manufacturing apparatus for the content storage container shown in FIG.

As shown in FIG. 1, the plastic material manufacturing apparatus 40 for the content storage container has a lid (also referred to as a plastic material) 10 before the exhaust elongated holes 12 are formed, and an exhaust elongated holes 32 are formed. An inner lid (also referred to as a plastic material) 30 is prepared, and an exhaust elongated hole 12 or an exhaust elongated hole 32 is formed in the lid 10 and the inner lid 30.

The plastic material manufacturing apparatus 40 for such a content storage container has a cutting jig 41 for placing the plastic material in contact with the lower surfaces (one surface) of the plastic materials 10 and 30, and the plastic material 10. , 30 is applied with ultrasonic waves to the upper surface (the other surface), and the plastic materials 10 and 30 are punched out from the cutting jig 41 to form elongated holes 12 and 32 for exhaust in the plastic materials 10 and 30. The ultrasonic wave applying device 50 is provided.

Of these, the cutting jig 41 has a plurality of cutting blades 42 having shapes corresponding to the plurality of elongated holes 12 and 32 for exhaust. Further, a storage pocket 42a for storing the punching residue discharged from the plastic materials 10 and 30 when the plastic materials 10 and 30 are punched out by the cutting blades 42 is formed between the cutting blades 42 of the cutting jig 41. When the plastic materials 10 and 30 are punched out by the cutting blade 42, the punching residue falls from the storage pocket 42a below the cutting jig 41.

Further, the ultrasonic wave applying device 50 abuts on the plastic materials 10 and 30 placed on the cutting jig 41 via a copper plate (metal plate) 45, and a tool horn 52 that applies ultrasonic waves to the metal plate 45. And a vibrator 51 connected to the tool horn 52 and applying ultrasonic vibration to the tool horn 52.

Further, as shown in FIG. 1, a generator 53 is connected to the vibrator 51.

Next, the operation of the present embodiment having such a configuration, that is, a method of manufacturing a plastic material for a content storage container using the plastic material manufacturing apparatus 40 for the content storage container will be described.

First, as shown in FIG. 1, the plastic materials 10 and 30 are placed on the cutting jig 41. After that, the lower surface of the tool horn 52 of the ultrasonic wave applying device 50 is brought into contact with the plastic materials 10 and 30 of the cutting jig 41 via the metal plate 45.

In this case, the plastic materials 10 and 30 are placed on the cutting jig 41 on the lower surface thereof, and ultrasonic waves are applied to the upper surfaces of the plastic materials 10 and 30 from the tool horn 52 via the metal plate 45. The lower surface of the tool horn 52 is a flat surface.

Next, the ultrasonic wave applying device 50 is operated, and the plastic material 10 and 30 are pressed by the lower surface of the tool horn 52 via the metal plate 45, and the plastic material 10 and 30 are pressed from the lower surface of the tool horn 52 via the metal plate 45. Ultrasonic waves are applied to 30. In this case, ultrasonic vibration of 10,000 to 40,000 times / sec is applied to the plastic materials 10 and 30 from the lower surface of the tool horn 52, and the vibration width at that time is 50 μm or less.

By applying ultrasonic vibration to the plastic materials 10 and 30 from the tool horn 52 in this way, the plastic materials 10 and 30 generate frictional heat with the cutting blade 42 of the cutting jig 41. Then, the plastic materials 10 and 30 are melted and cut by the frictional heat, and the elongated holes 12 and 32 for exhaust are formed in the plastic materials 10 and 30.

As described above, according to the present embodiment, by applying ultrasonic vibration to the plastic materials 10 and 30, the cutting blades 42 of the cutting jig 41 form the elongated holes 12 and 32 for exhaust with high accuracy. be able to. In this case, as compared with the case of using a laser beam, it is not necessary to finely control the irradiation amount and irradiation time of the laser beam to form the exhaust elongated holes 12 and 32, and the shapes of the exhaust elongated holes 12 and 32 are always constant. It is kept in the shape of. In addition, the peripheral shapes of the formed exhaust elongated holes 12 and 32 do not have irregularities when viewed in a plan view, and the edging can be beautifully finished. Further, according to the present embodiment, it is not necessary to use an expensive laser beam irradiation device as compared with the case of using a laser beam.

Next, with reference to FIG. 2, another embodiment of the method of forming the plurality of exhaust elongated holes 12 of the lid 10 and the plurality of exhaust elongated holes 32 of the inner lid 30 will be described.

The exhaust elongated hole 12 of the lid 10 and the exhaust elongated hole 32 of the inner lid 30 may be formed by using the plastic material manufacturing apparatus for the content storage container shown in FIG.

As shown in FIG. 2, in the plastic material manufacturing apparatus 40 for the content storage container, the lid (also referred to as plastic material) 10 before the exhaust elongated hole 12 is formed and the exhaust elongated hole 32 are formed. An inner lid (also referred to as a plastic material) 30 is prepared, and an exhaust elongated hole 12 or an exhaust elongated hole 32 is formed in the lid 10 and the inner lid 30.

The plastic material manufacturing apparatus 40 for such a content storage container has a cutting jig 41 for placing the plastic material in contact with the lower surfaces (one surface) of the plastic materials 10 and 30, and the plastic material 10. , 30 is applied with ultrasonic waves to the upper surface (the other surface), and the plastic materials 10 and 30 are punched out from the cutting jig 41 to form elongated holes 12 and 32 for exhaust in the plastic materials 10 and 30. The ultrasonic wave applying device 50 is provided.

Of these, the cutting jig 41 has a plurality of cutting blades 42 having shapes corresponding to the plurality of elongated holes 12 and 32 for exhaust.

Further, the ultrasonic wave applying device 50 comes into contact with the plastic materials 10 and 30 placed on the cutting jig 41, and also applies ultrasonic waves to the plastic materials 10 and 30 to the tool horn 52 and the tool horn 52. It has a vibrator 51 that is connected and applies ultrasonic vibration to the tool horn 52.

Further, as shown in FIG. 2, a generator 53 is connected to the vibrator 51. Further, the lower surface of the tool horn 52 is not flat, and the lower surface of the tool horn 52 is provided with a vibration pin 52a corresponding to each cutting blade 42 and capable of entering the cutting blade 42. ..

Next, the operation of the embodiment having such a configuration, that is, the method of manufacturing the plastic material for the contents storage container using the plastic material manufacturing apparatus 40 for the contents storage container will be described.

First, as shown in FIG. 2, the plastic materials 10 and 30 are placed on the cutting jig 41. After that, the lower surface of the tool horn 52 of the ultrasonic wave applying device 50 is brought into contact with the plastic materials 10 and 30 of the cutting jig 41.

In this case, the plastic materials 10 and 30 are placed on the cutting jig 41 on the lower surface thereof, and ultrasonic waves are applied from the tool horn 52 to the upper surfaces of the plastic materials 10 and 30. A plurality of vibration pins 52a are provided on the lower surface of the tool horn 52 corresponding to each cutting blade 42.

Next, the ultrasonic wave applying device 50 is operated, and the plastic materials 10 and 30 are pressed by the lower surface of the tool horn 52. At this time, the vibration pin 52a on the lower surface of the tool horn 52 enters the cutting blade 42, and ultrasonic waves are applied to the plastic materials 10 and 30 from the vibration pin 52a on the lower surface of the tool horn 52. In this case, ultrasonic vibration of 10,000 to 40,000 times / sec is applied to the plastic materials 10 and 30 from the vibration pin 52a on the lower surface of the tool horn 52, and the vibration width at that time is 50 μm or less.

By applying ultrasonic vibration to the plastic materials 10 and 30 from the vibration pin 52a of the tool horn 52 in this way, the plastic materials 10 and 30 have the vibration pin 52a of the tool horn 52 and the cutting blade of the cutting jig 41. Friction heat is generated with 42. Then, the plastic materials 10 and 30 are melted and cut by the frictional heat, and the elongated holes 12 and 32 for exhaust are formed in the plastic materials 10 and 30.

As described above, according to the present embodiment, by applying ultrasonic vibration to the plastic materials 10 and 30, the cutting blade 42 of the cutting jig 41 and the vibration pin 52a of the tool horn 52 exhaust the plastic materials with high accuracy. The long holes 12 and 32 can be formed. In this case, as compared with the case of using a laser beam, it is not necessary to finely control the irradiation amount and irradiation time of the laser beam to form the exhaust elongated holes 12 and 32, and the shapes of the exhaust elongated holes 12 and 32 are always constant. It is kept in the shape of. In addition, the peripheral shapes of the formed exhaust elongated holes 12 and 32 do not have irregularities when viewed in a plan view, and the edging can be beautifully finished. Further, according to the present embodiment, it is not necessary to use an expensive laser beam irradiation device as compared with the case of using a laser beam.

In the above embodiment, an example of a container for microwave-heated food having a container body 20 and an inner lid 30 as a content storage container has been shown, but the content storage container is limited to a flat bag. In this case, a long hole for exhaust is formed on the surface of the bag body.

Further, the content storage container is not necessarily limited to a container for storing food, and may be a container for storing contents such as cosmetics.

Furthermore, in the above embodiment, an example is shown in which the lid 10 and the inner lid 30 of the microwave oven-heated food container have the exhaust elongated holes 12 and 32 formed as through holes, but the exhaust elongated holes 12 are shown. , 32 may be formed as an exhaust round hole or an exhaust square hole as a through hole. Alternatively, the content storage container may be provided with a through hole not intended for exhaust.

1 Microwave oven Heated food container 10 Lid, plastic material 11 Lid surface 12 Exhaust elongated hole 12A Exhaust elongated hole group 20 Container body 21 Opening 30 Inner lid, plastic material 32 Exhaust elongated hole 32A Exhaust elongated hole group 40 Plastic material manufacturing equipment for contents storage container 41 Cutting jig 42 Cutting blade 45 Metal plate 50 Ultrasonic applying device 51 Transducer 52 Tool horn 53 Generator

Claims (4)

In the method of manufacturing plastic materials for content storage containers
The process of bringing one side of the plastic material into contact with the cutting jig,
A plastic for a content storage container, which comprises a step of applying ultrasonic waves from an ultrasonic wave applying device to the other surface of the plastic material to form a through hole in the plastic material with the cutting jig. Material manufacturing method. The method for producing a plastic material for a content storage container according to claim 1, wherein ultrasonic waves are applied to the other surface of the plastic material via a metal plate. In the equipment for manufacturing plastic materials for content storage containers
A cutting jig that contacts one side of the plastic material,
A plastic material for a content storage container provided with an ultrasonic wave applying device for applying ultrasonic waves to the other surface of the plastic material to form a through hole in the plastic material with the cutting jig. manufacturing device. The device for manufacturing a plastic material for a content storage container according to claim 3, wherein a metal plate is interposed between the ultrasonic wave applying device and the other surface of the plastic material.

Images