JP3535790B2 - Plastic packaging container - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin packaging container which has excellent liquid leakage prevention or sealing properties and easy opening and closing, and is preferably used as a packaging material for cooked foods.

[0002]

2. Description of the Related Art When selling food in a supermarket, a convenience store, a souvenir shop, etc., as a packaging material, a synthetic resin package including a container body having an open top and a lid closing the container body opening. A container is used. This kind of synthetic resin packaging container is usually formed so as to be hermetically sealed so that boiled liquid of the contained food or the like does not leak out of the container.

In recent years, against the background of diversification of processed foods, diversification of distribution forms, etc., instead of the sheet-molded article, which is conventionally mainstream, and which is formed by heat-sealing the lid to the peripheral edge of the container body, BACKGROUND ART Injection-molded products in which used containers are formed so as to be reusable at home while having a tamper-proof function have come to be often found.

For example, in Japanese Patent Laid-Open No. 9-226796, an outer peripheral rising piece and an inner peripheral rising piece are erected on the upper peripheral edge of the container body, while the falling piece is suspended on the inner peripheral side of the lid body. There has been proposed a synthetic resin hermetically sealed container having a press-fitting recess formed therein. In this closed container, when the lid is closed, the falling piece of the lid is inserted into the groove between the outer rising piece and the inner rising piece of the container body, and the upper end of the inner rising piece of the container body is inserted into the press-fitting recess of the lid. The part is formed to be press-fitted,
Once the lid is closed, the structure is such that the lower end of the lid falling piece exposed from the broken portion can be lifted and opened only by breaking and separating the broken piece connected to a part of the outer peripheral rising piece. ing. Thus, as a result of the falling piece of the lid body being inserted into the groove between the outer peripheral rising piece and the inner peripheral rising piece, it is difficult to pry open the lid body even with a sharp blade, etc. In order to prevent unauthorized opening, we leave tamper evidence on the broken pieces.

[0005]

However, in the conventionally provided injection-molded container, the container is often deformed due to the influence of the gas generated from the contained food and the change of the outside temperature, and the liquid leakage prevention is always stable. It was difficult to secure sex. Further, the lid body needs to be formed so as to be easily fitted to the container body so as to correspond to the packaging work in the automation line.

In the closed container of Japanese Patent Laid-Open No. 9-226796, when the lid is closed, the lid press-fitting concave portion and the periphery of the top of the rising piece on the inner circumference of the container body are formed in close contact with each other.
In addition to the deformation of the container due to external influences as described above, there is a risk of poor adhesion due to variations in the dimensions of the container itself, and if the lid expands and deforms due to the gas generated from the contained food, the lid press fits. There is a possibility that the sealing position between the concave portion and the top of the one head rising up the inner circumference of the container main body becomes irregular and a gap is formed, resulting in liquid leakage. Also, in order to open it, it is necessary to tear off the fragments, which has the drawback that it is difficult to open with people with weak strength such as old people and children, and when stacking only the lid, the fragments contact each other. It also had the drawback of being easily damaged. An object of the present invention is to provide a synthetic resin packaging container that does not have such drawbacks.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned intended problems, the present invention provides a container body having an opening on its upper surface,
By carefully studying the structure of the peripheral fitting part in the synthetic resin packaging container consisting of the lid body that is fitted into the container body and closes the opening, excellent leakage is achieved by adopting the following structure. We have realized a synthetic resin packaging container that has preventive or sealing properties and is easy to open and close. That is, on the peripheral edge of the container body, an outer wall having an engaging protrusion protruding in the inner peripheral direction and an inner wall having an engaging protruding protrusion protruding in the outer peripheral direction are erected while sandwiching the groove portion, and the outer wall and the groove portion A part is broken and formed so as to be rupturable and separable from the main body of the container, and a flange portion having a substantially arcuate cross section is hung at the peripheral edge of the lid body, and is projected upward on the inner peripheral side of the flange portion. In the inner surface of the recessed portion, a press-fitting concave portion having a pressing protrusion protruding in the outer peripheral direction and an engaging protrusion protruding in the inner peripheral direction is formed, and when the lid is closed, the flange portion of the lid body is in the groove portion of the container body. When the fitting flange is engaged with the lid flange engaging ridge whose tip is in contact with the groove and the engaging ridge on the outer wall of the container main body, the inner wall of the container main body becomes the press fitting recess of the lid. Container body by press fitting While the wall of the engaging protrusion engages the engaging projection of the lid press-fit in the recess, the pressing projections of the cover press fit in the recess on the inner peripheral surface of the container body inner wall is formed so as to close.

Therefore, when the lid is closed, the outer wall of the container body serves as a presser for the lid flange portion and presses the lid flange portion inward, so that the engagement protruding inward in the lid press-fitting concave portion. The ridge and the engaging ridge projecting in the outer peripheral direction on the inner wall of the container body always engage with each other while firmly adhering to each other. At the same time, since the inner wall of the container body strongly presses against the pressing ridge in the lid press-fitting recess, the inner peripheral surface of the container body inner wall and the pressing ridge in the lid press-fitting recess are in close contact with each other. It will be. Therefore, the inner wall of the container body is strongly sandwiched by the engaging ridges and the pressing ridges that are substantially on the same line in the lid press-fitting recess, and as a result, the pressure generated by the gas generated from the stored item or the weight load of the stored item is increased. Even if the container rises, the size of the container itself is varied, or the container is shrunk due to the outside air temperature, stable liquid leakage prevention is ensured without being affected by these.

Further, in the invention described in claim 2, in the fragment of the container body of the synthetic resin packaging container described in claim 1, when the container bodies are stacked, the container body located on the lower side is stacked. The hanging claw accommodated in the groove portion was hung, and the lower end of the hanging claw was pulled outward in the outer peripheral direction with the outer peripheral surface of the lid flange portion as a fulcrum, so that the fragment could be broken and separated from the container body.

For example, in the container disclosed in Japanese Patent Laid-Open No. 9-226796, a part of the lid is exposed by cutting off one end side of the fragment, and the lid can be opened only by lifting the exposed portion. For people such as old people who have weak fingertips, it is not always easy to tear off fragments that are the prerequisite for opening the lid. Since the fragment in the present invention uses the outer peripheral surface of the flange portion of the lid as a fulcrum, and the hooking claw hung at the lower part of the fragment as the force point, the lever principle facilitates the tearing of the entire fragment. is there.

As described above, although the opening can be facilitated by hanging the hooking claw on the lower part of the broken piece, when the containers are transported and stored, only a plurality of container bodies are stacked and stacked. The hooking claw in the container body may be bent or damaged due to contact or the like. Therefore, in the present invention, when the container main bodies are stacked, the hooking claws of the container main body located on the upper side are formed so as to be accommodated in the grooves of the container main body located on the lower side. I tried to protect it.

Further, in the invention described in claim 3, in the container body of the synthetic resin packaging container described in claim 1 or 2, the inner wall is formed higher than the outer wall, and the peripheral bottom surface is directed toward the outer peripheral direction. Was formed so as to incline downward. As a result, when the lid body is fitted to the container body, the tip of the lid body flange portion that is in close contact with the groove portion may unnecessarily enter the inner circumferential direction even if pressed by the outer wall of the container body. Since it is prevented, the pressing force exerted by the outer wall of the container main body acts in a direction to further strengthen the engagement between the engaging projections on the inner wall of the container main body and the engaging projections in the lid press-fitting recess. Further, when stacking the container bodies, the top of the inner wall of the container body located on the lower side supports the container body located on the upper side. Since it is formed to be inclined downward, the stacked container bodies are always maintained in a fixed position and the collapse of the load is prevented.

Further, in the invention described in claim 4, when the lids of the synthetic resin packaging containers described in claims 1 to 3 are stacked, the lids located on the lower side are stacked. The outer peripheral side apex of the press-fitting concave portion was formed so as to be in line contact with the flange base of the lid located on the upper side. Therefore, even when stacking lids together, stable placement of the lids and protection of the flange are strengthened, and the stacked lids are prevented from sticking to each other, improving workability for users such as food processors. Will be planned.

Further, in the invention described in claim 5, a slit-like notch is formed in the outer wall of the corner portion of the container body except the portion where the broken piece is provided. In this type of synthetic resin injection-molded container, high accuracy is required when fitting the container body and the lid, but opening and closing of the lid may become difficult due to temperature changes and the like. Therefore, except for the corner where the broken piece is provided, by forming a slit-shaped notch in the outer wall of the corner of the container body and dividing the outer wall into several parts, the flexibility of the outer wall of the container body is increased. , The lid and the container body are easily attached and detached.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan view showing an example of a container body in a synthetic resin packaging container according to the present invention, and FIG. 2 is a side view of the container body. 3 is a plan view showing an example of the lid body, and FIG. 4 is a side view of the lid body. As shown in the figure, the synthetic resin packaging container according to the present invention comprises a container body 1 having an opening on its upper surface, and a lid body 2 which is fitted into the container body 1 and closes the opening 11. , A packaging container formed by injection molding using a synthetic resin such as polypropylene.

FIG. 5 is an enlarged vertical sectional view of the peripheral portion of the container body of the example of FIGS. 1 and 2. Container body 1 of this example
In, the peripheral edge is formed so as to project from the upper end portion of the side wall 12 in the outer peripheral direction, and the outer wall 13 and the outer wall
An inner wall 14 higher than 13 is erected with a groove 15 interposed therebetween. The outer wall 13 has an engaging projection 13a projecting inward, and the inner wall 14 has an engaging projection 14a projecting outward in the vicinity of the upper end thereof.
Are formed respectively.

FIG. 6 is an enlarged vertical cross-sectional view in the vicinity of the broken piece in the container body, FIG. 7 is an enlarged front view in the vicinity of the broken piece, and FIG. 8 is an enlarged bottom view in the vicinity of the broken piece. Fragment 16 of this example is shown in FIG.
And, as shown in FIG. 2, it is provided as a part of the outer wall 13 and the groove portion 15 at the corner of the container body 1 having a substantially rectangular plane shape, and the lateral direction is provided so that the opening can be identified at a glance. A hooking claw 18 having a large number of ribs connected to is hung. Between the corner of the container body 1 and the hook 18
A space for inserting a finger when opening is provided, and the hooking claw 18 is provided at a total of seven places, and the breaking connecting portions 17a to 17f are provided.
It is integrally formed so as to be connected to the groove portion 15 and the like via the. However, since both ends of the broken piece 16 are separated from the outer wall 13 from the beginning, the broken piece 16 can be separated from the container body 1 by cutting the breaking connecting portions 17a to 17f.

FIG. 9 is an enlarged vertical sectional view of the peripheral edge portion of the lid body of the example of FIGS. 3 and 4. A flange portion 21 having a substantially arcuate cross-section is hung from the end of the lid body 2, and a press-fitting recess 22 is formed so as to project upward on the inner peripheral side of the flange portion 21. Then, the concave portion of the press-fitting concave portion 22
On the inner surface of 23, a pressing protrusion 24 protruding in the outer peripheral direction and an engaging protrusion 25 protruding in the inner peripheral direction are formed. The pressing ridges 24 in this example are arranged slightly above the engaging ridges 25, but are arranged at positions substantially opposite to each other.

FIG. 10 is an enlarged vertical sectional view of the peripheral portion when the lid is closed, that is, when the lid is fitted to the container body. As shown in the drawing, when the lid is closed, the flange portion 21 of the lid body 2 is fitted into the groove portion 15 of the container body 1, while the inner wall 14 of the container body 1 is fitted into the press-fitting recess 23 of the lid body 2 by press fitting. It At this time, the outer peripheral surface of the flange portion 21 protruding while curving in the outer peripheral direction is the engaging projection 13 on the outer wall 13 of the container body 1.
While engaging with a, the flange portion 21 is pressed inward by the entire outer wall 13 (arrow A). Since the inside of the groove 15 is inclined, the tip of the flange 21 does not enter the inner circumferential direction, and as a result, the pressing force by the outer wall 13 of the container body 1 acts in the direction of pushing up the lid 2 press-fitting recess 23 (arrow B). . Therefore, the lid body 2 flange portion 21 has the container body 1
Since it is pressed by the outer wall 13, the engaging protrusion 14a of the inner wall 14 and the engaging protrusion 25 in the press-fitting recess 23 of the lid 2 are firmly adhered to each other to form a sealing surface over the entire circumference. That is why.

Further, since the pressing ridge 24 in the lid 2 press-fitting recess 23 is in close contact with the inner peripheral surface of the container body 1 inner wall 14, the inner wall 14 of the container body 1 is firmly clamped in the lid press-fitting recess 23. Will be done. Even if gas is generated from the food contained in the container and the pressure inside the container rises to push the lid 2 upward, the flange portion 21 of the lid 2 causes the outer wall of the container body 1 to move.
Since it is pressed by 13, the engaging ridge 14a of the inner wall 14 of the container body 1 and the engaging ridge 25 in the press-fitting recess 23 of the lid 2 are more firmly adhered, and the sealing surface is Since it does not collapse, liquid leakage is prevented.

As described above, in the synthetic resin packaging container according to the present invention, when the lid is closed, the inner wall 14 of the container body 1 is firmly sandwiched in the press-fitting recess 23 of the lid 2, so that the inner surface of the press-fitting recess 23 and the container are closed. Even if there is a space between the inner wall 14 of the main body 1 and the top of the head, excellent liquid leakage prevention property or sealing property can be secured. Therefore, in the relationship between the inside of the press-fitting recess 23 of the lid 2 and the crown of the inner wall 14 of the container body 1, there is an advantage that strict dimensional accuracy is not required.

FIG. 11 is an enlarged vertical cross-sectional view in the vicinity of a fragment when the container bodies are stacked in two stages. As shown in the drawing, when the container bodies 1 are stacked in two or more steps and stacked, on the top of the inner wall 14 of the container body 1 located below,
The inner wall base of the container body 1 located on the upper side is placed and stably supported. On the other hand, the broken piece 16 of the container body 1 has a hooking claw 18 hanging downward from the bottom thereof, and the hooking claw 18 is located on the lower side when the container bodies 1 are stacked in multiple stages. Since it is accommodated in the groove portion 15 at, it is possible to prevent the hooking claw 18 from being damaged by an impact from the outside or the like.

FIG. 12 is an enlarged vertical cross-sectional view of the peripheral portion except the vicinity of the broken pieces when the container bodies are stacked in two stages. As shown, the inner wall of the container body 1 located on the lower side
Since the bottom portion of the peripheral edge of the upper container body 1 supported by 14 is inclined downward toward the outer periphery, the inner wall 14 of the container body 1 having a substantially rectangular shape in plan view is surrounded by the peripheral bottom portion of the container body 1 located on the upper side. As a result, the stacked container bodies are always maintained in a fixed position and the collapse of the load is prevented.

FIG. 13 is an enlarged vertical sectional view of the vicinity of a broken piece when the lid is closed. The broken piece 16 is a continuous connecting portion for breaking that connects the broken piece 16 and the container body 1 by pulling the lower end of the hooking claw 18 hanging downward in the outer peripheral direction with the outer peripheral surface of the lid flange portion 21 as a fulcrum. 17a, 17b, 17c are broken, and the broken pieces 16 are separated from the container body 1. At this time, the outer peripheral surface of the lid flange portion 21 is used as a fulcrum, and the lower end of the hook 18 is used as a force point.
Since it has a breaking action on c, the broken pieces 16 can be easily removed even by a person with weak fingertips. Since the flange portion 21 of the lid body 2 is exposed when the broken pieces 16 are removed, the lid can be easily opened by hooking the exposed portion with a finger and pulling it upward.

FIG. 14 is an enlarged vertical sectional view of a peripheral edge portion in a state where the lid bodies are stacked in two stages. As shown in the figure, when the lids 2 are stacked, the lids 2 located on the lower side are stacked.
As a result of the outer peripheral side apex of the press-fitting concave portion 22 making line contact with the base of the flange portion 21 of the lid body 2 located on the upper side, the press-fitting concave portion 22 of the lid body 2 located on the lower side is a flange portion of the lid body 2 located on the upper side. twenty one
Since it is surrounded by the inner peripheral surface, it can be stably held even when stacking the lid bodies 2 in multiple stages, and prevents the stacked lid bodies from sticking to each other, improving workability for users such as food processors. Planned.

Even when the container body 1 and the lid body 2 are stacked, as shown in FIGS. 12 and 14, the peripheral portions of the container body 1 or the lid bodies 2 may come into close contact with each other. Since it is not present, it is easy to remove each container body 1 or lid 2 in the packaging work. Further, as shown in FIG. 10, by forming the vicinity of the top portion of the outer wall 13 of the container body 1 in a taper shape in the inner peripheral direction, the flange portion 21 is provided with a groove portion when the lid body 2 is fitted into the container body 1. Since it functions as a guide for guiding the inside of 15, it is possible to obtain the effect of easy fitting.

FIG. 15 is a partially enlarged side view of the corner portion of the lid body of the example shown in FIG. The container body 1 of this example has a fragment
By forming slit-shaped notches 19 in the outer wall 13 and dividing the outer wall 13 surrounding the peripheral edge of the container body 1 into strips at three corners except the corner where the 16 is provided, the container body 1
The flexibility of the outer wall 13 is increased to facilitate the attachment and detachment of the lid and the container body. As described above, in the container according to the present invention, the flange portion 21 of the lid body 2 is exposed by removing the broken pieces 16 of the container body 1, and the lid body 2 is lifted by lifting the exposed portion upward. However, if the outer wall 13 of the container body 1 and the flange portion 21 of the lid 2 are too tightly fitted together, it becomes difficult to remove the lid. Therefore, by forming the notch 19 and dividing the outer wall 13, it is possible to give the outer wall 13 of the container body 1 a deformation when the lid 2 is attached to and detached from the container body 1.

[0028]

According to the synthetic resin packaging container of the present invention,
Even if pressure rises due to the gas generated from the contents or the weight load of the contents, variations in the size of the container itself, or contraction due to the outside temperature, etc., stable liquid leakage prevention is always secured without being affected by these To be done. Further, since it is easy to remove the stacking state and fit the lid body to the container body, it is possible to contribute to improvement of workability such as packaging work, and it is also suitable for an automation line.

Further, the broken pieces are not easily damaged even when stacking the container body, and it is useful in that the broken pieces can be cut off and the lid can be easily opened even with a weak force. It is a perfect packaging container.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a container body.

FIG. 2 is a side view of the container body.

FIG. 3 is a plan view showing an example of a lid body.

FIG. 4 is a side view of the lid.

5 is an enlarged vertical cross-sectional view of a peripheral edge portion of the container body of the example of FIGS. 1 and 2. FIG.

FIG. 6 is an enlarged vertical cross-sectional view in the vicinity of a broken piece in the container body.

FIG. 7 is an enlarged front view of the vicinity of a broken piece in the container body.

FIG. 8 is an enlarged bottom view of the vicinity of a broken piece in the container body.

9 is an enlarged vertical cross-sectional view of a peripheral edge portion of the lid body of the examples of FIGS. 3 and 4. FIG.

FIG. 10 is an enlarged vertical cross-sectional view of a peripheral edge portion in a state where the lid body is fitted to the container body.

FIG. 11 is an enlarged vertical cross-sectional view in the vicinity of a fragment when the container bodies are stacked in two stages.

FIG. 12 is an enlarged vertical cross-sectional view of a peripheral portion except for the vicinity of a fragment when the container bodies are stacked in two stages.

FIG. 13 is an enlarged vertical cross-sectional view of the vicinity of a fragment when the lid is closed.

FIG. 14 is an enlarged vertical sectional view of a peripheral edge portion in a state where the lid bodies are stacked in two stages.

FIG. 15 is a partially enlarged side view of the container corner portion of the example shown in FIG.

[Explanation of symbols]

1 container body 2 lid 11 openings 12 Side wall 13 outer wall 14 Inner wall 15 Groove 16 fractured part 17 Connection part 18 Claws 21 Flange 22 Press fit recess 23 recess

Claims (5)

(57) [Claims] 1. A synthetic resin packaging container, comprising: a container body having an opening on its upper surface; and a lid body fitted into the container body to close the opening. ,
An outer wall having an engagement ridge protruding in the inner peripheral direction and an inner wall having an engagement ridge protruding in the outer peripheral direction are erected so as to sandwich the groove portion, and the outer wall and a part of the groove portion are broken fragments as a container. The flange is formed so as to be rupturable and separable from the main body, and has a flange portion having a substantially arcuate section in the periphery of the lid body, and a concave portion that is formed so as to project upward on the inner peripheral side of the flange portion. The inner surface is formed with a press-fitting recess having a pressing protrusion protruding in the outer peripheral direction and an engaging protrusion protruding in the inner peripheral direction, and the flange portion of the lid body should be fitted into the groove portion of the container body when the lid is closed. By this, the outer peripheral surface of the lid flange portion whose tip is in contact with the groove is engaged with the engaging projection of the outer wall of the container main body, while the inner wall of the container main body is press-fitted into the press-fitting recess of the lid. As a result, the engaging ridges on the inner wall of the container body While engaged with the engaging protrusion in the recess, the pressing protrusion in the lid press-fit recess on the inner peripheral surface of the container main body inner wall is formed so as to close plastic packaging containers. 2. The hooking claw hangs down at a position where the broken pieces of the container main body are accommodated in the groove portion of the container main body located below when the container main bodies are stacked. 2. The synthetic resin packaging container according to claim 1, which is formed so as to be rupturable by pulling the lower end of the outer peripheral direction around the lid flange outer peripheral surface as a fulcrum. 3. The packaging container made of synthetic resin according to claim 1, wherein the container body has an inner wall formed higher than an outer wall thereof, and a peripheral bottom surface is inclined downward in the outer peripheral direction. 4. The lid body, when the lid bodies are stacked,
4. The synthetic resin packaging container according to claim 1, wherein the top of the outer peripheral side of the press-fitting concave portion of the lid located on the lower side is formed so as to make line contact with the flange base of the lid located on the upper side. 5. The synthetic resin packaging container according to claim 1, wherein the container body has slit-shaped notches formed in the outer walls of the corners except the portion where the broken pieces are provided.