JP6802993B2 - Plastic molded container - Google Patents

Description

The present invention relates to a plastic molded container that is sterilized under reduced pressure in a stacked state, and in particular, a plastic molded container that can be smoothly separated after the vacuum sterilization treatment and that the container can be evenly sterilized in a stacked state. Regarding.

When aseptically filling plastic molded containers such as cups and trays, there are methods of sterilizing the containers inside the device and methods of bringing in pre-sterilized containers outside the device. Specific methods include chemicals, gamma ray irradiation, and EB. There is irradiation and so on.

Conventionally, when sterilizing plastic molded containers such as cups and trays in-line, the containers are taken out (separated) one by one from the stacked state, the chemical is sprayed on the inner or outer surface of the container, and after staying, the drying process is performed. The predetermined sterilization is completed through. On the other hand, when sterilizing offline, those sterilized by gamma ray irradiation, EB irradiation, or ethylene oxide gas (hereinafter referred to as EOG) have been supplied so as not to cause secondary contamination.

Among them, when EOG or hydrogen peroxide gas, which is sterilized by a batch method, is used, the inside of the treatment tank is evacuated, and then each drug is sprayed into the chamber. By spraying in a vacuum state, the disinfectant spreads to every corner of the treatment tank including the container, and sterilization becomes possible.

In this way, plastic molded containers such as cups and trays are provided with stacking ribs so that the stack can be separated regardless of the load or close contact. It is processed in a stacked state, but in a stacking situation, the container may be deformed during vacuum or the disinfectant may not enter sufficiently. That is, with conventional stacking ribs, if sterilization is performed in a vacuum state, the stack may not be separated due to the load or close contact during stacking. In such a case, it is not possible to cope with the decompression and decompression by the device, the container is deformed during vacuum, or the disinfectant does not sufficiently enter.

In particular, they often occur in stackable containers that are sheet-molded (vacuum-formed) or injection-blow-molded.

Compared with the EOG sterilizer, the hydrogen peroxide gas sterilizer has a high vacuum state and a short treatment time, so that the influence is large.

Japanese Unexamined Patent Publication No. 2004-1824 Japanese Unexamined Patent Publication No. 2005-193908 Japanese Unexamined Patent Publication No. 2005-280329 Japanese Unexamined Patent Publication No. 2006-103725 Japanese Unexamined Patent Publication No. 2010-22028

The present invention has been made in consideration of such a point, and is a plastic molded container that undergoes vacuum sterilization treatment in a stacked state, and can be sterilized evenly during vacuum sterilization and is deformed. It is an object of the present invention to provide a plastic molded container that can be smoothly separated after sterilization under reduced pressure.

The present invention is a plastic molded container that undergoes vacuum sterilization treatment in a stacked state, and is connected to the body portion having an upper end edge that defines an opening and a flange portion provided on the upper end edge. The outer surface of the body is provided with a bottom portion, and an annular stacking rib that abuts on the upper end edge of the lower plastic molded container during stacking and extends in the circumferential direction is provided on the stacking rib, and the upper end of the lower plastic molded container is provided on the stacking rib. It is a plastic molded container characterized in that a plurality of air passages forming a communication space with the edge are formed.

The present invention is a plastic molded container that undergoes vacuum sterilization treatment in a stacked state, and is connected to the body portion having an upper end edge that defines an opening and a flange portion provided on the upper end edge. A bottom portion is provided, and a plurality of stacking ribs are provided on the outer surface of the body portion so as to contact the upper end edge of the lower plastic molded container during stacking, and between each stacking rib and between the upper end edge of the lower plastic molded container during stacking. It is a plastic molded container characterized in that a ventilation path forming a communication space is formed in the container.

The present invention is a plastic molded container characterized in that the upper end edge of the lower plastic molded container abuts on the lower surface of the stacking rib.

The present invention is a plastic molded container in which the stacking rib extends in the vertical direction and reaches the flange portion.

The present invention is a plastic molded container characterized in that the air passage extends in the vertical direction and reaches the flange portion.

The present invention is a plastic molded container that undergoes vacuum sterilization treatment in a stacked state, and is connected to the body portion having an upper end edge that defines an opening and a flange portion provided on the upper end edge. A bottom portion is provided, and an annular stacking rib that abuts on the bottom peripheral edge of the upper plastic molded container during stacking is provided on the inner surface of the body portion, and the stacking rib communicates with the bottom peripheral edge of the upper plastic molded container during stacking. It is a plastic molded container characterized in that a plurality of air passages forming a space are formed.

The present invention is a plastic molded container that undergoes vacuum sterilization treatment in a stacked state, and is connected to the body portion having an upper end edge that defines an opening and a flange portion provided on the upper end edge. A bottom portion is provided, and a plurality of stacking ribs that come into contact with the bottom peripheral edge of the upper plastic molded container during stacking are provided on the inner surface of the body portion, and between each stacking rib and between the bottom peripheral edge of the upper plastic container during stacking. It is a plastic molded container characterized in that a communication space is formed.

As described above, according to the present invention, the inner surface and the outer surface of the plastic molded container can be sterilized evenly during vacuum sterilization, no deformation occurs, and the plastic molded container is smoothly separated during vacuum sterilization. be able to.

FIG. 1 is a perspective view showing a first embodiment of a plastic molded container according to the present invention. FIG. 2 is a side sectional view showing a plastic molded container before stacking. FIG. 3 is a side sectional view showing a plastic molded container after stacking. FIG. 4 is a perspective view showing a modified example of the plastic molded container shown in FIG. FIG. 5 is a side sectional view showing a plastic molded container before stacking. FIG. 6 is a side sectional view showing a plastic molded container after stacking. FIG. 7 is a perspective view showing a second embodiment of the plastic molded container according to the present invention. FIG. 8 is a perspective view showing a modified example of the plastic molded container shown in FIG. 7. FIG. 9 is a side sectional view showing a third embodiment of the plastic molded container according to the present invention. FIG. 10A is a perspective view showing a fourth embodiment of the plastic molded container according to the present invention. FIG. 10B is a view taken along the line BB of FIG. 10A. FIG. 11 is a side sectional view showing a comparative example of a plastic molded container.

<First Embodiment>
Next, the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIGS. 1 to 3, the plastic molded container 10 according to the first embodiment of the present invention is subjected to a vacuum sterilization treatment in a stacked state.

Such a plastic molded container 10 has a body portion 11 having an upper end edge 13 that defines (forms) an opening 15 and a flange portion 14 provided on the upper end edge 13, and a bottom portion that is connected to the body portion 11. It includes a bottom portion 12 having a peripheral edge 12a. In this case, the plastic molded container 10 can be obtained by sheet molding, injection molding, or blow molding.

Further, on the outer surface of the body portion 11, an annular stacking rib 20 that comes into contact with the upper end edge 13 of the lower plastic molded container 10 during stacking and extends in the circumferential direction is provided so as to project outward from the body portion 11.

The stacking rib 20 projects outward from the body portion 11 and abuts on the lower surface 20a of the stacking rib 20 with the upper end edge 13 of the lower plastic molded container 10 during stacking.

Further, the stacking rib 20 is formed with a plurality of, for example, six ventilation passages 21 that form a communication space 25 with the upper end edge 13 of the lower plastic molded container 10 during stacking.

That is, the stacking ribs 20 formed on the body portion 11 of the plastic molded container 10 extend along the circumferential direction, and the stacking ribs 20 project outward from the body portion 11. When the plastic molding container 10 is stacked, the lower surface 20a of the stacking rib 20 of the upper plastic molding container 10 comes into contact with the upper end edge 13 of the lower plastic molding container 10, and the upper plastic molding container 10 is the lower plastic molding. It is supported by the container 10.

In this case, since the communication space 25 is formed by the ventilation passage 21 provided in the stacking rib 20 between the upper end edge 13 of the lower plastic molded container 10 during stacking, the lower plastic molded container 10 is formed during stacking. The inside will communicate with the outside. As shown in FIGS. 1 to 3, the communication space 25 of the stacking ribs 20 extends upward in the vertical direction from the lower surface of the stacking ribs 20 and ends at an intermediate portion in the vertical direction of the stacking ribs 20.

Next, the operation of the present embodiment having such a configuration will be described.

In FIGS. 1 to 3, a plurality of plastic molded containers 10 are prepared and stacked (stacked) with each other. Next, the stacked plastic molded containers 10 are carried into a vacuum container (not shown), and the vacuum container is in a vacuum state. Then, in the vacuum container, a disinfectant such as ethylene oxide gas (EOG) or hydrogen peroxide gas is sprayed onto the plastic molded container 10 while maintaining the vacuum state.

By spraying the disinfectant onto the plastic molded container 10 under a vacuum state in this way, the disinfectant spreads on the inner and outer surfaces of each of the stacked plastic molded containers 10 and sterilizes the inner and outer surfaces of the plastic molded container 10. It can be sterilized with an agent. In this case, since the inside of each of the stacked plastic molded containers 10 communicates outward through the communication space 25 formed by the ventilation passage 21, the inside surface and the outer surface of each plastic molded container 10 are spread over. The disinfectant can be reliably distributed. Further, since the inside of each plastic molding container 10 communicates with the outside through the communication space 25, the plastic molding container 10 is not dented or deformed by the external pressure even when the plastic molding container 10 is put in a vacuum state.

Next, FIG. 11 shows a plastic molded container 10 as a comparative example. The plastic molded container 10 shown in FIG. 11 has a body portion 11 and a bottom portion 12, and a stacking rib 20 extending in the circumferential direction is provided on the body portion 11 so as to project outward from the body portion 11.

In the plastic molded container 10 shown in FIG. 11, the lower surface of the stacking rib 20 of the upper plastic molded container 10 abuts on the upper end edge 13 of the lower plastic molded container 10 during stacking, and the inside of each plastic molded container 10 is outward. It is sealed from.

At this time, when the disinfectant is sprayed onto each of the stacked plastic molded containers 10 under a vacuum state, the inside of each plastic molded container 10 is sealed by the stacking rib 20, so that the disinfectant is applied to the plastic molded container 10. It is difficult to spread it on the inner surface and the outer surface, and it is also conceivable that the plastic molded container 10 is dented or deformed by the external pressure.

On the other hand, according to the present embodiment, when the stacked plastic molded containers 10 are sterilized in a vacuum state, the bactericide can be reliably distributed over the inner and outer surfaces of the plastic molded containers 10. The plastic molded container 10 is not deformed even if it is sterilized under a vacuum state. Furthermore, since the inside of each plastic molded container 10 communicates with the outside, when the vacuum state for the plastic molded container 10 is released after the sterilization treatment is completed, each of the plastic molded containers 10 can be easily separated one by one. Can be done.

Next, a modification of the plastic molded container 10 will be described with reference to FIGS. 4 to 6. In the modified example of the plastic molded container 10 shown in FIGS. 4 to 6, a plurality of, for example, six stacking ribs 22 that come into contact with the upper end edge 13 of the lower plastic molded container 10 during stacking on the outer surface of the body 11 are attached to the body 11. A ventilation passage 23 is provided between the stacking ribs 22 so as to project outward from the surface and form a communication space 25 between the stacking ribs 22 and the upper end edge 13 of the lower plastic molded container 10 during stacking.

Other configurations are substantially the same as those of the first embodiment shown in FIGS. 1 to 3.

In the modified examples shown in FIGS. 4 to 6, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIGS. 4 to 6, when a plurality of plastic moldings are stacked, the lower surface 22a of each stacking rib 22 of the upper plastic molding container 10 comes into contact with the upper end edge 13 of the lower plastic molding container 10, and the upper plastic molding The container 10 is supported by the lower plastic molded container 10.

In this case, since the communication space 25 is formed in the plastic molded container 10 by the ventilation passage 21 provided between the stacking ribs 22 between the plastic molded container 10 and the upper end edge 13 of the lower plastic molded container 10 during stacking, the communication space 25 is formed during stacking. , The inside of the lower plastic molded container 10 communicates with the outside. As shown in FIGS. 4 to 6, each stacking rib 22 extends vertically from the body portion 11 and reaches the flange portion 14. Therefore, the ventilation passage 23 between the stacking ribs 22 also reaches the flange portion 14.

<Example>
Next, a specific example of the first embodiment will be described.

(Pressurization / decompression test)
a. A predetermined number of plastic molded containers 10 according to the present embodiment were stacked and carried into a batch type hydrogen peroxide gas sterilizer, and batch processing (decompression / decompression treatment) was started.
b. Immediately after the batch processing was completed, the container 10 was taken out and the stacking status of the container 10 was confirmed.

(Evaluation content)
1. 1. Purpose Stacking by treating the plastic molded container 10 having the stacking ribs of the conventional shape (see FIG. 11) and the plastic molded container 10 (FIGS. 1 to 6) according to the present embodiment with a batch type hydrogen peroxide gas sterilizer. The effects of different rib shapes on container deformation during pressurization and depressurization were compared.

2. 2. Test method (1) Evaluation sample (i) Conventional container (Fig. 11): An annular and smooth stacking rib is provided below the flange portion.
(Ii) Containers according to the present embodiment (FIGS. 1 to 3): Six ventilation passages are provided on the annular stacking ribs, and the upper and lower containers are in contact with each other other than the six ventilation passages.
(Iii) Containers according to the present embodiment (FIGS. 4 to 6): Six stacking ribs are evenly provided on the circumferential portion below the flange portion, and the upper and lower containers are in contact with each stacking rib.
(2) Number of molded product stacks: 10
(3) Batch type hydrogen peroxide gas sterilizer: Amsco V-PRO1 (STERIS Corporation)
(4) Test conditions Processing time 20 minutes / Number of decompressions for chemical treatment 1 time / Number of decompressions for exhaust 5 times / Decompression level Maximum decompression 50 Pa or less Treatment conditions (decompression → drug injection → decompression) × 1 time (decompression → restoration) Pressure) x 5 times → End Here, in the hydrogen peroxide gas sterilizer, it is common to add a certain amount of chemicals multiple times to increase or decrease the bactericidal effect, and this treatment condition is the test condition at the time of one chemical injection. It is based on.
The pressure of 50 Pa is 1/2000 of the atmospheric pressure, which is a higher decompression level than 1/7 of the case of ethylene oxide gas sterilization.

3. 3. Results (i) In the conventional plastic molded container shown in FIG. 11, as a result of the stacking ribs being tightened at the time of pressure recovery, a sealed portion was generated and the bottom of most of the containers was significantly deformed. In addition, biting was confirmed in almost all containers, and it was difficult to separate them.
(Ii) In the plastic molded container of the present embodiment shown in FIGS. 1 to 3 and the plastic molded container of the present embodiment shown in FIGS. 4 to 6, inseparable deformation and biting did not occur. ..
(Iii) These results are shown in Table 1.

(Drug adhesion test using batch hydrogen peroxide gas sterilizer)
a. A chemical indicator (CI), which changes color according to the amount of the drug attached, was attached to the bottom of the plastic molded container.
b. A predetermined number of containers were stacked and carried into a batch-type hydrogen peroxide gas sterilizer, and batch processing was started.
c. Immediately after the batch processing was completed, the cells were taken out, the degree of discoloration of CI was confirmed with a color difference meter, and the bactericidal effect was calculated.

(Evaluation content)
1. 1. Purpose By treating a plastic molded container with a conventional stacking rib and a plastic molded container according to the present embodiment with a batch type hydrogen peroxide gas sterilizer, the amount of hydrogen peroxide adhered due to the difference in the shape of the stacking rib is compared. did.

2. 2. Test method (1) Evaluation sample (i) Conventional container (Fig. 11): An annular and smooth stacking rib is provided below the flange portion.
(Ii) Containers according to the present embodiment (FIGS. 1 to 3): Six ventilation passages are provided on the annular stacking ribs, and the upper and lower containers are in contact with each other other than the six ventilation passages.
(Iii) Containers according to the present embodiment (FIGS. 4 to 6): Six stacking ribs are evenly provided on the circumferential portion below the flange portion, and the upper and lower containers are in contact with each other at the stacking ribs.
(2) Number of molded product stacks: 10
(3) Batch type hydrogen peroxide gas sterilizer: Amsco V-PRO1 (STERIS Corporation)
(4) CI: e-CARD (Elquest Co., Ltd.) As the amount of hydrogen peroxide adhered increases, the color changes from red to yellow.
(5) Color difference meter (spectral colorimeter): CM-700d (Konica Minolta Co., Ltd.) L ^* a ^* b ^* Notation (6) Evaluation criteria The amount of discoloration of CI exceeds the amount of adhesion equivalent to the bactericidal effect 6 in the past. When the packaging material was sterilized using a batch type hydrogen peroxide gas sterilizer, the amount of change in the color difference of CI under the test conditions where the sterilization effect 6 was achieved by surface sterilization is ΔE * in L * a * b * notation. Since ab≈6, it was adopted as an achievement standard for sterilization of plastic molded containers.
(7) Test conditions Processing time 25 minutes / Hydrogen peroxide spray and decompression frequency 4 g x 2 times / Exhaust decompression frequency 5 times / Decompression level Maximum decompression 50 Pa or less (1/2000 of atmospheric pressure)
Here, in a hydrogen peroxide gas sterilizer, it is common to add a certain amount of chemicals a plurality of times to increase or decrease the sterilizing effect. This condition is based on the test condition when the drug is added twice, which has been obtained as a test result that the bactericidal effect on the surface of general plastic products is 6 or more.

3. 3. Result (i) In the conventional container, there was a container whose color difference did not meet the standard, but the measurement was performed in the container of the present embodiment (FIGS. 1 to 3) and the container of the present embodiment (FIGS. 4 to 6). All containers exceeded the standard.
(Ii) These results are shown in Table 2.

(Discussion of specific examples)
(I) In the conventional container, when the stacked container is left under a reduced pressure (vacuum) state and the pressure is restored, a defect such as deformation / biting making it impossible to separate the container occurs. However, according to the present embodiment. Due to the air passage formed in the container, biting did not occur, and the stacked container could be easily separated even after the decompression / decompression treatment.
(Ii) According to the present embodiment, in addition to the advantages of the stacking ribs, the shape of the stacking ribs is changed to ensure air permeability when the pressure changes, so that deformation does not occur and the non-defective rate of the container is increased. Improved.
(Iii) Sterilization in which chemicals are adhered in a decompressed (vacuum) state in a stacked state and aerated by repeating depressurization and decompression in order to prevent a sealed part from being created by ensuring air permeability when pressure changes. When processed with the device, it became possible to evenly sterilize the outer and inner surfaces of the plastic molded container.
(Iv) In order to ensure air permeability when the pressure changes, the chemicals spread throughout the stacked containers during batch sterilization, and the overall sterilization effect was enhanced.

<Second Embodiment>
Next, a second embodiment of the present invention will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, the plastic molded container 10 according to the second embodiment of the present invention is subjected to a vacuum sterilization treatment in a stacked state.

Such a plastic molded container 10 has a body portion 11 having an upper end edge 13 that defines (forms) an opening 15 and a flange portion 14 provided on the upper end edge 13, and a bottom portion that is connected to the body portion 11. It includes a bottom portion 12 having a peripheral edge 12a. In this case, the plastic molding container 10 is obtained by sheet molding.

Further, on the outer surface of the body portion 11, a plurality of, for example, six stacking ribs 26 that come into contact with the upper end edge 13 of the lower plastic molded container 10 during stacking are provided so as to project outward from the body portion 11.

The stacking rib 26 projects outward from the body portion 11 and abuts on the lower surface thereof at the upper end edge 13 of the lower plastic molded container 10 during stacking.

Further, between the stacking ribs 26, a plurality of, for example, six ventilation passages 27 are formed so as to form a communication space 25 with the upper end edge 13 of the lower plastic molded container 10 during stacking. In FIG. 7, the circumferential length of the stacking rib 26 is shorter than the circumferential length of the air passage 27.

That is, six stacking ribs 26 formed on the body portion 11 of the plastic molded container 10 are provided along the circumferential direction, and each stacking rib 26 projects outward from the body portion 11. When the plastic molded container 10 is stacked, the lower surface of the stacking rib 26 of the upper plastic molded container 10 comes into contact with the upper end edge 13 of the lower plastic molded container 10, and the upper plastic molded container 10 is the lower plastic molded container. Supported by 10.

In this case, since the communication space 25 is formed between the upper end edge 13 of the lower plastic molded container 10 during stacking and the ventilation passage 27 provided between the stacking ribs 26, the lower plastic molded container 10 is stacked. The inside of 10 will be communicated with the outside.

Next, the operation of the present embodiment having such a configuration will be described.

In FIG. 7, a plurality of plastic molded containers 10 are prepared and stacked (stacked) with each other. Next, the stacked plastic molded containers 10 are carried into a vacuum container (not shown), and the vacuum container is in a vacuum state. Then, in the vacuum container, a disinfectant such as ethylene oxide gas (EOG) or hydrogen peroxide gas is sprayed onto the plastic molded container 10 while maintaining the vacuum state.

By spraying the disinfectant onto the plastic molded container 10 under a vacuum state in this way, the disinfectant spreads on the inner and outer surfaces of each of the stacked plastic molded containers 10 and sterilizes the inner and outer surfaces of the plastic molded container 10. It can be sterilized with an agent. In this case, since the inside of each of the stacked plastic molded containers 10 communicates outward through the communication space 25 formed by the ventilation passage 21, the inside surface and the outer surface of each plastic molded container 10 are spread over. The disinfectant can be reliably distributed. Further, since the inside of each plastic molding container 10 communicates with the outside through the communication space 25, the plastic molding container 10 is not dented or deformed by the external pressure even when the plastic molding container 10 is put in a vacuum state.

As described above, according to the present embodiment, when the sterilization treatment is performed, the sterilizing agent can be reliably distributed over the inner and outer surfaces of the plastic molded container 10, and even if the sterilization treatment is performed under a vacuum state, the plastic The molding container 10 is not deformed. Furthermore, since the inside of each plastic molded container 10 communicates with the outside, when the vacuum state for the plastic molded container 10 is released after the sterilization treatment is completed, each of the plastic molded containers 10 can be easily separated one by one. Can be done.

In the second embodiment shown in FIG. 7, an example in which the circumferential length of the stacking rib 26 is shorter than the circumferential length of the ventilation path 27 is shown, but the present invention is not limited to this, and is shown in FIG. As described above, the circumferential length of the stacking rib 26 may be longer than the circumferential length of the air passage 27, and the upper plastic molded container 10 may be stably supported by the lower plastic molded container 10.

<Third embodiment>
Next, a third embodiment of the present invention will be described with reference to FIG.

In the third embodiment of the present invention shown in FIG. 9, an annular stacking rib 28 that abuts on the upper end edge 13 of the lower plastic molded container 10 during stacking and extends in the circumferential direction is formed on the outer surface of the body portion 11. It is provided so as to project outward from the portion 11, and the lower surface 28a of the stacking rib 28 is formed in a curved shape.

By forming the lower surface 28a of the stacking rib 28 of the plastic molding container 10 in a curved shape in this way, a communication space 25 is formed in the stacking rib 28 between the stacking rib 28 and the upper end edge 13 of the lower plastic molding container 10 at the time of stacking. A ventilation path 29 is provided.

In the third embodiment shown in FIG. 9, the same parts as those in the first embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 9, when the plastic molded container 10 is stacked, the lower surface 28a of the stacking rib 28 of the upper plastic molded container 10 comes into contact with the upper end edge 13 of the lower plastic molded container 10, and the upper plastic molded container 10 moves downward. It is supported by the plastic molded container 10. In this case, since the communication space 25 is formed by the ventilation passage 29 provided in the stacking rib 20 between the stacking and the upper end edge 13 of the lower plastic molded container 10, the inside of the lower plastic molded container 10 is stacked. Will communicate with the outside.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. 10A and 10B.

As shown in FIGS. 10A and 10B, the plastic molded container 10 according to the fourth embodiment of the present invention is subjected to a vacuum sterilization treatment in a stacked state.

Such a plastic molded container 10 has a body portion 11 having an upper end edge 13 that defines (forms) an opening 15 and a flange portion 14 provided on the upper end edge 13, and a bottom portion that is connected to the body portion 11. It includes a bottom portion 12 having a peripheral edge 12a. In this case, the plastic molded container 10 can be obtained by injection molding or blow molding.

Further, on the inner surface of the body portion 11, six stacking ribs 30 that come into contact with the bottom peripheral edge 12a of the upper plastic molded container 10 during stacking and extend in the circumferential direction are provided so as to project inward from the body portion 11.

The stacking rib 30 projects inward from the body portion 11 and abuts on the upper surface 30a of the stacking rib 30 against the lower peripheral edge 12a of the upper plastic molded container 10 during stacking.

Further, the body portion 11 is formed with a plurality of, for example, six annular ventilation passages 31 extending in the circumferential direction that form a communication space 25 with the bottom peripheral edge 12a of the upper plastic molded container 10 during stacking.

That is, six stacking ribs 30 formed on the body portion 11 of the plastic molded container 10 are provided along the circumferential direction, and the stacking ribs 30 project inward from the body portion 11. When the plastic molding container 10 is stacked, the upper surface 30a of the stacking rib 30 of the lower plastic molding container 10 comes into contact with the bottom peripheral edge 12a of the upper plastic molding container 10, and the upper plastic molding container 10 is the lower plastic molding. It is supported by the container 10.

In this case, since the communication space 25 is formed by the ventilation passage 31 provided in the body 11 between the bottom peripheral edge 12a of the upper plastic molded container 10 during stacking, the lower plastic molded container 10 is formed during stacking. The inside of the will be communicated with the outside.

In the embodiment shown in FIGS. 10A and 10B, six stacking ribs 30 are provided on the inner surface of the body 11 so as to come into contact with the bottom peripheral edge 12a of the upper plastic molded container 10 during stacking, and the body 11 is circular. An example is shown in which six air passages 31 extending in the circumferential direction are provided, but the present invention is not limited to this, and a plurality of stacking ribs 30 abutting on the bottom peripheral edge 12a of the upper plastic molded container 10 are circumferentially formed on the inner surface of the body portion 11. It may be provided along the direction. In this case, a ventilation path is formed between the stacking ribs 30.

10 Plastic molded container 11 Body 12 Bottom 12a Bottom edge 13 Top edge 14 Flange 15 Opening 20 Stacking rib 21 Ventilation passage 22 Stacking rib 23 Ventilation passage 25 Communication space 26 Stacking rib 27 Ventilation passage 28 Stacking rib 29 Ventilation passage 30 Stacking rib 31 Ventilation

Claims (3)

In a plastic molded container that undergoes vacuum sterilization in a stacked state
A body portion having an upper end edge defining an opening and a flange portion provided on the upper end edge,
With a bottom connected to the body
An annular stacking rib that abuts on the upper edge of the lower plastic molded container during stacking and extends in the circumferential direction is provided on the outer surface of the body portion.
A plurality of ventilation passages forming a communication space between the stacking rib and the upper end edge of the lower plastic molded container during stacking are formed.
A plastic molded container characterized in that each ventilation path extends from the lower end of the stacking rib to a range ending from the center of the stacking rib . Plastic molded container of claim 1, wherein the upper edge of the plastic molded container below the lower surface of the stacking ribs abut. The plastic molded container according to claim 1 or 2 , wherein the stacking rib extends in the vertical direction and reaches the flange portion.

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