JP3127219U - Container with lid - Google Patents

Abstract

【Task】
A container with a lid formed of a polypropylene resin sheet in which a container body and a lid part are connected via a hinge part. The lid part is closed and left in a sealed state, and then the lid part is opened. In this case, there is provided a container with a lid in which the lid is maintained in an open state by its own weight without pressing the lid by hand.
[Solution]
In the hinge part connecting the lid part and the container main body, the repulsive force generated in the hinge part is suppressed by forming a penetration part by making a cut in the long side direction of the hinge part.
[Selection] Figure 1

Description

  The present invention relates to a lidded container in which a container main body and a lid part are connected by a hinge part, and particularly to a lidded container formed from a polypropylene resin sheet.

  Conventionally, plastic containers with lids made of polyvinyl chloride, polyethylene terephthalate, polystyrene, etc., in which the container body and lid are connected by a hinge, have been used as containers for packing food and the like (patents) Reference 1).

  By the way, as for the said container with a lid | cover, it is common that a lid | cover and a container main body are integrally formed in the state which the lid | cover opened by thermoforming etc. using the resin sheet. The formed container is generally transported and stored in a state in which it is formed, that is, in a state where the lid is opened. In use, the container body is filled with contents such as food with the lid open, and then the lid, which has been opened, is closed, and the container body and the peripheral edge of the lid are overlapped and heat-sealed. The sealing operation is performed by, for example, stopping with a staple or the like, or putting the container body and the lid together and applying a rubber band.

  The sealed container with lid is then unpacked and removed in a state where the lid is opened in order to take out the contents filled in the container.

JP-A-10-264952

  From the viewpoint that a container with a lid having excellent heat resistance, strength, oil resistance, etc. can be obtained in the above-mentioned container with a lid, since it has properties superior to other synthetic resins as a material of the container, in recent years A container with a lid using a polypropylene resin sheet has been used.

  The container with a lid made of the polypropylene resin sheet is generally formed with the lid open as described above, but the lid of the container with the lid opened after the formation is closed is immediately after When the external force is removed, the lid tries to return to the open state. That is, a repulsive force is exerted in the hinge portion connecting the lid portion and the container main body in the direction in which the lid portion is closed. However, in the case of a polypropylene-based resin sheet, unlike other general-purpose synthetic resin sheets, when the above sealing operation is completed and left in a sealed state for several hours, and then the lid is opened to take out the contents. The hinge portion exhibits a repulsive force in the direction of opening the lid portion, and even if the lid portion is tilted in the opening direction more than perpendicular to the container body, the hinge portion returns to the closing direction, The removal work was difficult. Especially when the above-mentioned container with a lid is a food container and the contents filled in the container body are eaten directly from the container, it must be eaten while keeping the lid open with one hand. There was a problem that it was difficult.

  As a solution for keeping the lid open at the time of the above-described removal operation, the lid portion is made sufficiently heavy with respect to the length in the long side direction of the hinge portion, thereby obeying the weight of the lid portion. It may be possible to maintain the open state. However, as described above, since the lid, the hinge, and the main body are integrally formed by thermoforming using a polypropylene resin sheet, the lid-equipped container means that the weight of the entire container is increased. This is undesirable from the viewpoint of manufacturing cost and transportation cost. Also, it is not desirable to make the length of the hinge part in the long side direction too short, because this causes a decrease in the strength of the hinge part, and also causes damage and cutting of the hinge part.

The inventors have found that in a lidded container formed of a polypropylene resin sheet, the behavior of the lid portion is different before and after sealing.
That is, when an external force is applied in the direction in which the lid portion is closed in the container in which the lid portion after formation is open, a repulsive force is generated in the direction in which the lid portion is closed in the hinge portion of the container. The open state of the lid is maintained. On the other hand, once the lid portion is sealed and left for a certain period of time, when the lid portion is opened, a repulsive force is generated in the direction of opening the lid portion at the hinge portion, and the lid portion is kept open. As a result, it was confirmed that the direction in which the repulsive force in the hinge portion changes was changed while the device was left standing for a certain period of time.

Further, regarding the repulsive force in the hinge part, when a well-known general-purpose synthetic resin sheet, for example, a container with a lid formed by a polystyrene resin sheet is observed in the same manner, the above-mentioned defect of a container formed using a polypropylene resin sheet Was not confirmed.
In other words, as a comparison, a container with a lid formed of a polystyrene-based resin sheet was used, and when trying to close the formed container in the same manner as described above, and trying to open the container after being left in a sealed state for several hours. When the behavior of the lid portion at the time was observed, a repulsive force was generated in the direction of closing the lid portion at the hinge portion both before and after the sealing state. In other words, even when left in a sealed state for a certain period of time, in a container with a lid formed of a polystyrene-based resin sheet, there is no change in the direction in which the repulsive force is shown in the hinge portion, and the hinge before and after the sealed state It was found that the change in the direction of the repulsive force of the part is a behavior peculiar to a container formed using a polypropylene resin sheet.

  The present invention has been made in view of the above problems, and is a container with a lid having excellent mechanical strength, heat resistance, and oil resistance, which is easy to take out, and in particular, eats food in the container directly from the container. The object is to provide a container with a lid that is easy to eat.

In the container with a lid in which a container body formed using a polypropylene resin sheet and a lid part are connected via a hinge part, the inventors have made a cut in the hinge part, thereby It was found that the repulsive force was suppressed and that the open state and the closed state could be maintained according to its own weight, and the present invention was completed.

That is, the present invention
(1) A container with a lid in which a container main body and a lid part are connected via a hinge part, which is formed from a polypropylene resin sheet, and the hinge part is cut in the long side direction of the hinge part. A container with a lid, characterized by having a penetrating part formed by inserting and a non-penetrating part adjacent thereto,
(2) The weight of the lid portion is 1.5 g or more and 15 g or less, and the maximum lateral length of the lid portion when the long side direction of the hinge portion is a lateral direction is 15 cm or more and 23 cm or less, The maximum vertical length of the lid part is 7 cm or more and 15 cm or less when the direction perpendicular to the long side direction is the vertical direction, and the total length in the long side direction of the non-penetrating part formed adjacent to the notch The lidded container according to (1) above, wherein the ratio of the lid portion to the maximum lateral length is 1: 2.5 to 1:25,
(3) The penetrating portions and the non-penetrating portions are each of a fixed length and are alternately arranged from one end to the other end in the long side direction of the hinge portion, and one length of the non-penetrating portion is (1) or (2) above, wherein the penetrating part is formed in at least one end in the long side direction of the hinge part within a range of 0.1 mm to 4 mm. A container with a lid,
(4) The lidded container according to any one of (1) to (3) above, wherein the polypropylene resin sheet is a transparent polypropylene resin sheet,
(5) Any one of (1) to (4) above, wherein a flange that contacts the periphery of the container body and the periphery of the lid portion is formed when the lid portion is closed. A lidded container according to
(6) The concave portion and / or the convex portion that are fitted to each other are provided along the peripheral direction of the container body and the lid portion. Container with lid,
(7) The lid portion is provided with a concave and / or convex rib portion extending in the lateral direction of the container at any one or more of the flange, the concave portion or the convex portion facing the hinge portion. A container with a lid according to (5) or (6) above,
(8) At least one of the flange, the concave portion, and the convex portion located between the hinge portion and the container main body or the lid portion is provided with a groove portion that communicates with the inside and outside of the container when the lid portion is closed. The lidded container according to any one of (1) to (7) above,
Is a summary.

  In the present invention, the term “maximum lateral length” for the lid means the maximum length of the lid in the length direction of the hinge. Similarly, the term “maximum vertical length” for the lid means the maximum length of the lid in the direction orthogonal to the length of the hinge of the lid.

  Since the container with a lid of the present invention has a penetrating part and a non-penetrating part in the length direction of the hinge part, the repulsive force in the hinge part is suppressed, so that the lid is kept closed for several hours. Even in this case, the lid can be kept open according to its own weight. Therefore, since the force of the lid portion closing is suppressed by the change in the direction indicated by the repulsive force of the hinge portion after being sealed for a certain time, which is a problem peculiar to polypropylene resin, the filling in the container In particular, when the food in the container is directly eaten from the container, it is not necessary to hold the cover part by hand to keep the cover part open, and it is very easy to use.

The best mode for carrying out the present invention will be described below with reference to the drawings.
A container 1 with a lid according to the present invention shown in FIG. 1 has a container body 2 and a lid part 3 connected to each other via a hinge part 4. The hinge part has a penetrating part 5 formed by cutting and the penetrating part 5. A non-penetrating part 6 adjacent to the part is formed. A flange 7 extends outward from the peripheral edge of the container body 2 and a flange 8 extends outward from the peripheral edge of the lid 3.

  The said container 1 can form a container main body, a cover part, and a hinge part integrally by thermoforming, such as vacuum forming, using a polypropylene-type resin sheet.

The hinge portion 4 in the container 1 connects the lid portion 3 and the container body 2 and is a portion that is bent when the lid portion 3 is opened and closed. When the lid portion 3 is opened, the hinge portion 4 is downwardly U-shaped. It is formed to become. The said aspect is one Embodiment, Comprising: The shape of the hinge part in this invention is not limited. The hinge part in this invention should just connect at least a cover part and a container main body, and operate | moves so that a cover part can be opened and closed. Therefore, the length in the width direction of the hinge portion 4 is only required to be long enough to open and close the lid portion, and the shape is the U-shape shown in FIG. 1, that is, the lid portion is closed. Aspects other than the aspect in which the hinge portion of the lidded container has R, for example, a flat shape, a downward V-shape, etc. may be employed.
In particular, the U-shaped hinge portion 4 shown in FIG. 1 has an advantage that play is easily provided when the lid portion is opened and closed. Therefore, as in the embodiment of the present invention to be described later, in a lidded container in which the lid portion and the container body can be fitted together, the hinge portion is formed in a U-shape to form a fitting structure portion of the lid portion. This is desirable because it is easy to match the fitting structure portion of the container body.

The penetrating portion 5 provided in the hinge portion 4 is formed by making a cut in the long side direction of the hinge portion 4. Further, in the long side direction of the hinge portion, the through portion 5 is formed, so that the non-penetrating portion 6 is formed as a portion adjacent to the through portion 5 that is not cut.
As a method of making a cut in the hinge part 4, when a polypropylene resin sheet is thermoformed by providing a mold for making a cut in the molding die, a container with a cut-in lid is integrally formed or molded. There is a method of forming a cut in a container with a lid using a rotary blade, a cutter blade, a hot blade or the like.

  The interval between the cuts, that is, the length of the penetrating portion 5 is the weight of the lid portion, the length of the hinge portion in the long side direction, the maximum vertical length of the lid portion, the maximum lateral length of the lid portion, and the non-penetrating portion described later. In consideration of the length and the like, the repulsive force in the opening / closing direction of the lid portion generated in the hinge portion can be determined to be substantially suppressed. The lengths of the penetrating part and the non-penetrating part may be the same or different, and the lengths of the penetrating parts and the non-penetrating parts may be uniform or different. Good.

  On the other hand, the length of the non-penetrating portion 6 in the present invention is required to suppress the repulsive force of the hinge portion with respect to the operation in the opening / closing direction of the lid portion, and is long enough to connect the container body 2 and the lid portion 3. From this point of view, the ratio of the total length in the long side direction of the non-penetrating portion 6 to the maximum horizontal length of the lid portion 3 is 1: 2.5 to 1:25. Is desirable. More preferably, it is 1: 2.5-1: 20, More preferably, it is 1: 2.5-1: 15. In the above ratio, the total length in the long side direction of the non-penetrating portion 6 is 1, whereas the maximum lateral length of the lid portion 3 is set to 2.5 or more, so that the penetrating portion can be sufficiently formed. It is desirable that the total length can be ensured, and that the repulsive force of the hinge portion 4 with respect to the operation in the opening / closing direction of the lid portion can be effectively suppressed. While the total length in the long side direction of the non-penetrating portion 6 is 1, by making the maximum lateral length of the lid portion 3 within 25, the excellent repulsive force suppressing effect can be exhibited and the hinge portion The strength with respect to the twisting direction can be sufficiently maintained.

As described above, the total sum of the non-penetrating portions in the present invention is preferably in the above-mentioned range with respect to the maximum lateral length of the lid, and thereby, the repulsive force of the hinge portion can be suppressed, and the lid, the container body, It is possible to sufficiently fulfill the role of the hinge portion connecting the two.
That is, the total length of the non-penetrating portions is maintained within a preferable numerical range for the maximum lateral length of the lid described above regardless of the length of the hinges, whereas the total length of the penetrating portions is the hinge length. In terms of length, it is desirable that the sum of the lengths of the non-penetrating portions is determined as a subtraction.
Moreover, in the sum total of the length of the said penetration part, the length of each penetration part formed can be determined suitably.

The length of each non-penetrating portion 6 may be arbitrarily determined, but is usually 0.1 to 10 mm, preferably 0.1 to 7 mm, and more preferably 0.1 mm to 4 mm. The lengths of the non-penetrating portions 6 may be different or the same.
For example, as shown in FIG. 1, the penetrating part 5 and the non-penetrating part 6 are alternately arranged from one end of the hinge part to the other end in the long side direction of the hinge part with a fixed length, and are formed in a so-called perforation shape. be able to. As described above, in the case of forming a perforation, it is particularly desirable to form one length of the non-penetrating portion 6 within a range of 0.1 mm or more and 4 mm or less, and 0.5 mm or more. It is more desirable to form with a length of 3 mm or less. By setting the length of the non-penetrating portion 6 to 0.1 mm or more, it is possible to maintain a state where the lid portion and the container body are well connected, while the length of the non-penetrating portion 6 is set to 4 mm or less. By doing so, it is possible to cut the non-penetrating part 6 by hand force and to separate the lid part 3 from the container body 2.
From the viewpoint of cutting the non-penetrating portion 6 and separating the lid portion 3 from the container body 2, it is desirable that the penetrating portion 5 is formed at at least one end in the long side direction of the hinge portion 4 (FIG. In the container 1 shown in FIG. 1, a mode in which through portions 5 are formed at both ends of the hinge portion 4 is shown). Thereby, the penetration part 5 formed in the edge part of the hinge part 4 becomes a cutting start position of the non-penetration part 6, and the non-penetration part 6 can be easily cut. Therefore, in this aspect, when the container 1 of the present invention is filled with food, and the food in the container is eaten, the lid and the container body can be easily separated and separated, and the lid is eaten. This is preferable in that it does not obstruct the container, and the volume of the container can be reduced when the container with a lid is discarded.
As another example, one penetration part may be formed at the center of the hinge part, and a non-penetration part may be provided adjacent to both ends thereof.

  By forming the penetration part 5 and the non-penetration part 6 in the hinge part 4 as mentioned above, it becomes possible to suppress the repulsive force of the hinge part with respect to the opening / closing direction of the lid part. If the weight of the lid is made sufficiently heavy without providing the non-penetrating part, it is possible to keep the lid in an open state or a closed state according to its own weight. As described above, the increase in transportation cost and production cost is undesirable.

In this specification, “the lid portion maintains a closed state according to its own weight” means that the lid portion is inclined from the vertical to the container body side with respect to the container body, and then the force applied to the lid portion is released. This means that the lid is maintained at the same angle or is further inclined toward the container body. Further, in the present invention, “the lid portion is kept open according to its own weight” means that the container is placed on the table top surface, raised by the external force by 90 degrees or more from the container, and then the external force applied to the lid portion is released. Means that the lid portion is inclined to the opposite side of the container body from an angle perpendicular to the table top surface.
In the present invention, as described above, the lid portion that is maintained in the closed state and the open state according to its own weight is provided with a penetrating portion and a non-penetrating portion in the hinge portion of the present invention, so This is achieved by suppressing the repulsive force.

  Moreover, the container with a lid of the present invention having the weight of the lid portion has a lateral length of the lid portion 3 of 15 cm or more and 23 cm or less when the long side direction of the hinge portion 4 is a lateral direction. When the direction perpendicular to the long side direction of 4 is defined as the longitudinal direction, the length of the lid portion 3 in the longitudinal direction is preferably 7 cm or more and 15 cm or less.

  In the container 1 of the present invention in which the vertical and horizontal dimensions of the lid 3 are in the above-described range, the weight of the lid 3 is preferably 1.5 g or more and 15 g or less, and preferably 3 g or more and 13 g or less. Is more preferable. At this time, the thickness of the polypropylene resin sheet used for forming the container 1 is 0.01 cm or more and 0.1 cm or less, more preferably 0.02 cm or more and 0.04 cm or less.

As shown in FIG. 1, the container 1 of the present invention may be provided with a flange 7 and a flange 8 on the periphery of the container body 2 and the lid 3. The flange 7 and the flange 8 are formed so that they can contact each other when the lid 3 is closed. In the present invention, the term “flange” is provided so as to project outward from the peripheral edges of the container body and the lid portion, and when the lid portion is closed, the flange 8 in the lid portion and the flange 7 in the container body can be brought into contact with each other. Means a structured part.
In addition, when a convex part and a recessed part are provided along the peripheral part of a container main body and a container cover body so that it may mention later, the said flange may be provided in the further peripheral part of this convex part and a recessed part.

Next, the polypropylene resin sheet used in the present invention will be described.
Examples of the polypropylene constituting the polypropylene resin sheet for forming the container of the present invention include propylene homopolymer, block polymer of propylene and α-olefin other than propylene, random copolymer, graft copolymer, etc. Mention may be made of copolymers.
As α-olefins other than propylene, those selected from ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 4-methyl-1-pentene, etc. Or can be used optionally in combination.

  Further, when the container of the present invention is formed using a transparent polypropylene resin sheet, for example, a transparent formed by melting and extruding the above-described resin component into a sheet-like body and rapidly cooling the sheet-like body. A transparent polypropylene resin sheet formed by adding a crystallization agent to the resin component described above can be used. Examples of the crystallization agent include sorbitols such as 1,3,2,4- (dimethylbenzylidene) sorbitol, metal salts of aromatic phosphate compounds such as sodium methylene phosphate (2,4-tert-butylphenyl), aromatic And an organic crystal nucleating agent such as poly (3-methyl-pentene-1).

The transparent polypropylene resin sheet described above does not limit the resin constituting the transparent polypropylene resin sheet used in the present invention. The transparent polypropylene resin sheet for molding the container of the present invention is easily molded from the outside of the container even when the lid is closed by molding the container using the sheet. It is important to be visible, and transparency in a range that facilitates such visual recognition is required. The container of the present invention formed using a transparent polypropylene resin sheet can be effectively used as, for example, a food pack for stuffing food.
The transparent polypropylene resin sheet preferably has a haze of 25% or less. The lower the haze, the higher the transparency, more preferably 20% or less, still more preferably 15% or less.
In the present invention, haze is a value calculated according to JIS K7136 (2000).

As described above, the inventor has a container with a lid formed of a polypropylene-based resin sheet, in a state where the lid portion after formation is opened, a repulsive force is generated in the direction of closing the lid portion at the hinge portion, Once the lid part is sealed and left for a certain period of time, when the lid part is opened, a repulsive force is generated in the direction of opening the lid part at the hinge part. We found that the direction of repulsive force was changing. Moreover, when the container with a lid | cover formed with the polystyrene-type resin sheet was observed similarly, it discovered that the behavior different from the container formed using the polypropylene-type resin sheet was shown.
It is inferred that the change in the repulsive force at the hinge part and the difference in behavior between the polypropylene resin sheet and the polystyrene resin sheet are partly due to the difference in the glass transition point between the polypropylene resin and the polystyrene resin. The

Next, another embodiment of the present invention will be described with reference to FIG.
The container 11 shown in FIG. 2 is configured by connecting a container main body 12 and a lid part 13 by a hinge part 14. Convex portions 17 are provided along the entire periphery of the container body 12, while concave portions 19 are provided along the entire periphery of the lid portion 13. It is formed so that it can be fitted.
In addition, a flange 18 is provided at an angle of about 90 degrees with respect to the side surface of the convex portion 17 from the edge of the convex portion 17 toward the outer side of the container. On the other hand, from the edge of the concave portion 19 toward the outer side of the container. The flange 20 is provided at an angle of about 90 degrees with respect to the side surface of the convex portion 19.
A plurality of groove portions 21 formed in a groove shape are provided along the width direction of the flange 18 and the side surface of the convex portion 17 on the hinge 14 side. One end of the groove portion 21 faces the steam recovery port 22 formed by lowering the upper surface of the convex portion 17 and the other end faces the inner surface of the hinge portion 14.
Furthermore, the bottom surface of the recess 19 in the flange 20 and the flange 20 are respectively provided with groove-like ribs 23 extending in the long side direction on the side facing the hinge portion 14. The rib 23 is formed by providing a groove in the flange 20 and the recess 19 that is convex in the table top direction when the container 11 is installed on the table top and the lid 13 is opened.
3 is a cross-sectional view taken along the line AA of the container 11 shown in FIG.

As described above, if the container 11 of the present invention has a fitting structure composed of the convex portion 17 and the concave portion 19 on the entire periphery of the container body 12 and the lid portion 13, the lid portion 13 can be tightly sealed. it can. Another effect obtained by providing the fitting structure is to improve the strength of the container body and the lid. Also from this viewpoint, it is desirable that the fitting structure is provided on the entire periphery.
However, the container with a lid in the present invention does not necessarily require the fitting structure to be provided on the entire circumference of the container body and the periphery of the lid. For example, as the above-described fitting structure, convex portions and concave portions that can be fitted to each other may be formed on the periphery of the container main body and the lid portion in pieces or partially. When the fitting structure is provided in a fragmentary or partial manner as described above, a peripheral surface that connects the upper ends of the concave portions is formed, and the lower ends of the convex portions are arranged between the corresponding convex portions. It is preferable that a peripheral surface connecting the two is formed, and the peripheral surfaces are in contact with each other when the lid is closed.

  Next, the groove part 21 in this invention is demonstrated. FIG. 4A shows an enlarged view of the groove 21 and the steam recovery port 22 in the container 11. The groove portion 21 in the present invention uses the present invention as a heat-resistant container, and discharges steam generated inside the container when the heated food is filled or when the filled food is heated together. The main purpose is to do this. Therefore, the groove portion 21 in the present invention needs to adopt at least a structure communicating with the inside and outside of the container, but it is desirable to form a groove portion communicating with the inside and outside of the container in order to effectively discharge water vapor.

Here, as shown in FIG. 2 and FIG. 4A, the groove portion 21 is formed with a groove that is refracted at 90 degrees along the hinge side surface of the convex portion 17 and the flange 18 width direction. One end of the groove portion 21 faces the hinge portion 14 adjacent to the flange 18 and communicates with the inside and outside of the container from both ends of the hinge portion 14 through the hinge portion 14 in a state where the lid portion is closed. At this time, when the steam generated in the container 11 is discharged from the groove part 21, the steam is discharged from the both ends of the hinge part 14 to the outside of the container through the hinge part 14. That is, in the above-described aspect in which one end of the groove portion 21 faces the hinge portion 14, both ends of the hinge portion 14 act as a water vapor discharge port, and the water vapor can be discharged smoothly.
The other end of the groove 21 faces a steam recovery port 22 formed one step lower on the upper surface of the convex portion 17 and communicates with the inside of the container 11 through the steam recovery port 22. Therefore, when the lid portion 13 and the container main body 12 are fitted, the groove portion 21 has a structure capable of communicating with the inside and outside of the container. In addition, since the vapor | steam collection | recovery port 22 is provided, the effect that the water vapor | steam in a container can be efficiently introduce | transduced by the groove part 21 is exhibited.
The groove part 21 and the steam recovery port 22 described above can be easily obtained by integrally forming a polypropylene resin sheet by thermoforming a lidded container of the present invention.

The groove portion 21 shown in FIG. 2 is provided at both ends of the flange 18 in contact with the hinge portion 14 so as to avoid the central portion in the long side direction of the flange. When a warm food is contained in the container, or when the container itself is heated and heated, the user of the container often has the center of the flange. It is effective to provide the groove portion 21 from both ends thereof, avoiding the portion. However, the formation position of the groove portion 21 provided in the flange in the present invention is not limited to this, and it may be formed in an arbitrary number at arbitrary locations on the entire circumference of the flange and the convex portion. It may also be provided in a flange and a recess provided in. Or you may provide only in the flange and recessed part of a cover part.
Moreover, although the aspect which provided the steam recovery port 22 was demonstrated in FIG.2 and FIG.4 (a), this steam recovery port 22 is not necessarily an essential structure in this invention. That is, as shown in FIG. 4B, the groove portion 21 is formed by providing a continuous groove from the flange 18 to the hinge side surface of the convex portion 17 and the upper surface thereof, and one end of the groove portion 21 is directly connected to the inside of the container. You may form so that it may face.

  Next, the rib 23 will be described. The rib 23 shown in FIG. 2 has a convex shape in the direction of the desktop surface when the lid 12 is opened in the flange 20 and the concave portion 19 facing the hinge portion 14 with the container 11 placed on the desktop surface. The formed groove is formed by extending in the container lateral direction. The position and the number of ribs provided in the present invention are not limited to the mode shown in FIG. 2, and any one or more of the flange 18, the flange 20, the convex portion 17, or the concave portion 19 facing the hinge portion 14. Can be provided. That is, it is important that the rib is provided at a position facing the hinge portion at the peripheral portion of the lid portion or the container body. Moreover, FIG. 2 does not limit the shape of the rib provided in this invention, This rib may be formed in concave shape.

  As described above, a lidded container formed using a polypropylene-based resin sheet has a lid portion, a container body, and a hinge portion integrally formed with the lid portion open at the time of formation. It is common to carry and store several layers in an open state. However, in such a state, the container is added by the weight of the container itself that has been stacked several times. In particular, in a low temperature state of −5 degrees or less, the container may be brittlely broken even if a slight impact is applied. is there. In particular, the long side of the lid portion facing the hinge portion is fragile. However, with the lidded container of the present invention having the rib 23, the brittleness is alleviated and brittle fracture is effectively suppressed even in a low temperature environment as described above.

Next, while showing examples and comparative examples of the present invention, in order to confirm the difference in the behavior of the lid portion with respect to the examples of the present invention using a polypropylene resin, a polystyrene resin sheet was used as an experimental example. It illustrates also about the formed container with a lid.
Example 1
With a transparent polypropylene resin sheet (haze 8%) having a thickness of 0.25 mm formed using a transparent polypropylene resin formed by quenching an extruded resin sheet, the lid is opened. A container body, a lid, and a hinge portion configured in an R shape are integrally formed by thermoforming, and a non-penetrating portion having a width of 0.2 cm and a width of 0. A container in which 8 cm through portions were alternately formed so as to cover the entire long side direction of the hinge portion was taken as Example 1. In Example 1, the maximum horizontal length is 20 cm, the maximum vertical length is 14 cm, the depth of the container body is 2.8 cm, the depth of the lid is 1.7 cm, the length of the hinge in the long side direction is 16 cm, the width of the hinge The length in the direction was 1.1 cm. The weight of the lid when the lid and the container main body were cut at the central portion in the width direction of the hinge was 5.8 g.

(Comparative Example 1)
A container formed in the same manner as in Example 1 except that no cut was made in the hinge part was used as Comparative Example 1.

(Reference Example 1)
Moreover, the container formed with the molding method similar to Example 1 using the polystyrene-type resin sheet of thickness 0.25mm formed using unstretched transparent polystyrene resin was made into the reference example 1. FIG.

(Reference Example 2)
A container formed in the same manner as in Reference Example 1 except that no cut was made in the hinge part of Reference Example 1 was used as Reference Example 2.

For Example 1, Comparative Example 1, and Reference Examples 1 and 2, the behavior of the lid was evaluated for the following items. The evaluation results are shown in Table 1.
(Evaluation 1)
After forming the container, place the container with the lid open on the table top, first tilt the lid to the 120 ° angle from the container body, and then release the force applied to the lid. The behavior of the lid at that time was confirmed as the behavior at the first closing. Next, as the second closing behavior, the lid portion is inclined in the closing direction from the container body to a position of 45 degrees, and then the force applied to the lid portion is released, and the behavior of the lid portion at that time is It confirmed and evaluated as follows.
・ At the first closing, the angle of the lid is maintained at an angle of 120 degrees or more with respect to the container body, and at the second closing, the lid is inclined in a direction of less than 45 degrees with respect to the container body ...・ ・ ○
・ At the first closing, the angle of the lid is maintained at an angle of 120 degrees or more with respect to the container body, and at the second closing, the lid is opened in a direction of 45 degrees or more with respect to the container body. ... ×

(Evaluation 2)
Next, for the container installed on the table top surface, the lid is closed to a position in contact with the container body and sealed in that state, left in the sealed state for 12 hours, and then unsealed. The lid was opened to a position of 60 degrees from the container body, and then the force applied to the lid was released, and the behavior of the lid at that time was confirmed as the behavior at the time of the first opening. Next, the lid is opened to 120 degrees with respect to the container body, then the force applied to the lid is released, and the behavior of the lid at that time is confirmed as the behavior at the time of the second opening, and the following Evaluation was as follows. The evaluation results are shown in Table 1.
・ At the first opening, the angle of the lid is inclined in a direction that is less than 60 degrees with respect to the container body, and at the second opening, the angle of the lid is inclined in a direction that is 120 degrees or more with respect to the container body.・ ・ ・ ○
・ In both the first opening and the second opening, the lid angle is inclined in the direction of 120 degrees or more with respect to the container body.
・ In both the first opening and the second opening, the lid angle is inclined in a direction that is less than 60 degrees with respect to the container body.

(Table 1)

From the results of Evaluations 1 and 2, it was only Example 1 that operated the lid according to its own weight when the external force was released after the lid was tilted by external force. On the other hand, in the hinge part in the comparative example 1, in the evaluation 1, the repulsive force is exhibited in the direction in which the lid is closed, while in the evaluation 2, the repulsive force is exhibited in the direction in which the lid is opened. It was confirmed that
Thereby, it was shown that the repulsive force in the hinge part is suppressed in the present invention in which the through part is provided in the hinge part in the container formed using the polypropylene resin sheet.

  In Reference Examples 1 and 2 formed using a polystyrene-based resin sheet, it was confirmed that the lid portion showed the same behavior in Evaluations 1 and 2 regardless of the presence or absence of the penetrating portion in the hinge portion. From this, the effect of suppressing the repulsive force of the hinge part by providing a through part in the hinge part is not exhibited particularly from a container formed using a polystyrene resin sheet, and in particular, a polypropylene resin sheet. It was confirmed that it was remarkably exhibited in a container formed using

Next, in order to evaluate the brittleness in the low temperature environment of the present invention in which ribs are provided on the flange and the concave portion facing the hinge portion, the following examples were carried out and evaluated.
(Example 2)
In the container of Example 1, a recess having a width of 0.6 cm and a depth of 0.7 cm is formed on the entire periphery of the lid, and a flange having a width of 0.4 cm is formed on the periphery of the recess. A convex portion having a width direction of 0.6 cm and a height of 0.7 cm and a flange having a width dimension of 0.4 cm were formed on the periphery of the convex portion. In the lid portion, a groove-shaped rib having a width of 0.2 cm, a length of 14 cm, and a depth of 0.1 cm extending in the lateral direction of the container is formed on the bottom surface of the concave portion facing the hinge portion, and the concave portion A groove-shaped rib having a width of 0.2 cm, a length of 12 cm, and a depth of 0.1 cm, which is a flange provided on the periphery and extends in the lateral direction of the container at a position facing the hinge portion, was formed. In the container provided with the rib, the container main body and the lid were cut at the center in the width direction of the hinge, and the lid was used as a test piece of Example 2.

(Comparative Example 2)
The lid cut from the container body formed in the same manner as in Example 2 except that the rib was not formed was used as a test piece of Comparative Example 2.

(Evaluation 3)
In a test room that maintains a low-temperature environment, fix the lid so that the ribs are upright by holding one short side of the lid at the bottom and the other short side at the top on a horizontal table. Then, by adjusting the amount of strain to be constant, a load was applied from above the lid, and a compression cracking test was conducted and evaluated. The maximum peak load applied to the lid was about 410 g.

The strength measuring device used in this test is a device composed of a base, three struts, a load measuring device, and a load adjusting device. Two pillars are erected on the base and one pillar is erected on the rear, and the load measuring device and the load adjusting device are integrally formed with the base via the pillars. The load measuring device is installed between the two front columns, and the load adjusting device is installed above the rear column.
The load measuring device is composed of a test piece clamping unit composed of a laterally elongated lower clamping unit as well as a laterally elongated upper clamping unit, and a load reader that displays the maximum peak load. Yes. Both ends of the lower clamping part and the upper clamping part are attached to the two front struts so as to be horizontal with respect to the base, and the both clamping parts are parallel to each other in the vertical direction.
The upper clamping part clamps one short side of the test piece, that is, the lid part, and the lower clamping part clamps the other short side of the lid part. After holding the lid part up and down, the load adjustment device moves the upper clamping part downward, and shortens the distance from the lower clamping part where the position is fixed, so that a constant load is applied to the lid part to be held Can be applied. Further, the load applied to the lid is measured by a load reader connected to the lower clamping unit.

In the above apparatus, the mechanism for applying a load to the lid portion by moving the upper clamping portion downward is as follows.
The load adjusting device includes a main body portion and a strain amount adjusting unit, and the strain amount adjusting unit is attached to a movable column, a bridge piece fixed to the movable column, and the bridge piece. It consists of a strain adjustment bolt. And the load adjusting device is being fixed to the said back one support | pillar in a main-body part. In addition, a lever is attached to one side of the main body portion, and the movable support is moved up and down in conjunction with the lever by moving the lever, and the bridge is fixed to the movable support. The piece also moves at the same time.
The bridge piece is provided along the front side surface of the main body portion, and is further bent at a right angle from the lower end of the main body portion in the front direction, and a hole is formed in a substantially central region of the folded surface. In this hole, a bolt provided on the upper surface of the upper clamping portion passes and is fixed with a nut. As a result, the upper clamping portion and the strain amount adjusting portion are integrally fixed via the bridge piece, and the movable strut and the bridge piece are interlocked with the vertical movement by moving the lever. Thus, the upper clamping device can also be moved up and down. That is, the upper and lower holding parts are respectively installed on the apparatus with both short sides of the cover part sandwiched between them, and in this state, the upper holding part moves downward by pulling the lever, and the upper and lower parts It is a mechanism that can apply a load to the lid installed between the sandwiches.
The bridge piece is folded at a right angle above the upper surface of the main body portion of the load adjusting device, and a hole is formed in a substantially central region of the surface folded at a right angle to the rear, so that the bridge piece can move up and down. Bolts are installed. The bottom surface of the bolt and the top surface of the main body portion of the load adjusting device are usually separated from each other, but when the strain amount adjusting unit moves downward by pulling the lever (that is, when the bridge piece moves downward), When the distance between the bottom surface of the bolt and the top surface of the main body is reduced and finally comes into contact with each other, the lever cannot be pulled any further. Therefore, the bolt serves as a stopper for the lever, and the maximum position of the lever is determined by adjusting the position of the bolt, which is the stopper, by vertical movement in advance and determining the distance from the bottom surface of the bolt to the main body. The downward movement distance can be made constant by determining the amount of movement and pulling the lever to the maximum. That is, the downward movement distance of the upper holding portion can be made constant, and as a result, a constant load can be applied to the lid portion disposed between the holding portions with a desired strain amount.
The low temperature environment was adjusted as follows.

The test pieces in Example 2 and Comparative Example 2 are carried into a freezer adjusted to the test temperature (−5 ° C., −10 ° C.) in advance, and left for 17 hours so that the test pieces reach the test temperature. Next, the test piece was set in the strength measuring apparatus in the freezer so that the length direction was perpendicular to the load, and the lever of the measuring instrument was quickly lowered and loaded, and the crack of the test article was evaluated as follows. Each test temperature was evaluated using 10 test pieces in Example 2 and Comparative Example 2. The evaluation results are shown in Table 2.
No cracks occurred ...
Cracking occurred but no spattering of fragments was observed ...
Cracking occurred and debris scattered ...

At test temperatures of −5 ° C. and −10 ° C., the lid of the container of Example 2 did not crack even when a load was applied, indicating that the brittleness in a low temperature environment was excellent.
On the other hand, in Comparative Example 2, at the test temperatures of −5 ° C. and −10 ° C., all the lids in the container of Comparative Example 2 were cracked, and some of them were observed to be scattered, and brittle fracture occurred in a low temperature environment. It was shown to occur easily.
From the above results, in the container having no rib structure in the flange or recess in the lid as in Comparative Example 2, the ambient temperature was −5 ° C. or lower, and the temperature of the container itself was also equal to the ambient temperature. In some cases, there is a possibility that cracking may occur due to a certain load applied to the container. However, in the present invention in which a rib structure is provided in a flange and / or a recess facing the hinge portion in the lid portion, However, even when the temperature of the container itself is equal to or lower than the ambient temperature, the strength against the load is exhibited and the brittleness in the low temperature environment is reduced. Therefore, especially when used, transported or stored in a cold district or in a low temperature environment, it is a very advantageous low temperature brittleness measure to have a rib structure on the flange as described above.

It is a perspective view which shows one embodiment of the container of this invention of the state which open | released the cover part. It is a top view which shows one embodiment of the container of this invention of the state which open | released the cover part. It is AA sectional drawing of this invention shown in FIG. FIG. 4 a is a partially enlarged view showing the groove portion 21, and FIG. 4 b is a partially enlarged view showing another embodiment of the groove portion 21.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 2 Container main body 3 Cover part 4 Hinge part 5 Penetration part 6 Non-penetration part 11 Container 12 Container main body 13 Lid part 14 Hinge part 15 Penetration part 16 Non-penetration part 17 Convex part 18 Flange 19 Concave part 20 Flange 21 Groove part 22 Steam recovery Mouth 23 rib

Claims (8)

A container with a lid in which a container main body and a lid part are connected via a hinge part, which is formed from a polypropylene resin sheet, and the hinge part is cut into the long side direction of the hinge part. A container with a lid, which has a penetrating part to be formed and a non-penetrating part adjacent thereto. The weight of the lid is 1.5 g or more and 15 g or less, and the maximum lateral length of the lid is 15 cm or more and 23 cm or less when the long side direction of the hinge part is the lateral direction, the long side direction of the hinge part When the vertical direction is the vertical direction, the maximum vertical length of the lid portion is 7 cm or more and 15 cm or less, and the total length in the long side direction of the non-penetrating portion formed adjacent to the notch and the lid portion The ratio with respect to the maximum lateral length of 1: 2.5 to 1:25 is a container with a lid according to claim 1. The penetrating part and the non-penetrating part have a fixed length and are alternately arranged from one end to the other end in the long side direction of the hinge part, and one length of the non-penetrating part is 0.1 mm. The lidded container according to claim 1 or 2, wherein the penetrating portion is formed in at least one end in the long side direction of the hinge portion within a range of 4 mm or less. The container with a lid according to any one of claims 1 to 3, wherein the polypropylene resin sheet is a transparent polypropylene resin sheet. The lid according to any one of claims 1 to 4, wherein a flange that comes into contact with the periphery of the container body and the periphery of the lid is formed when the lid is closed. container. The container with a lid according to any one of claims 1 to 5, wherein a concave part and / or a convex part to be fitted to each other are provided along a peripheral direction of the container main body and the lid part. In the lid portion, a concave and / or convex rib portion extending in a lateral direction of the container is provided at any one or more of the flange, the concave portion, and the convex portion facing the hinge portion. The container with a lid according to claim 5 or 6. At least one of the flange, the concave portion, and the convex portion located between the hinge portion and the container body or the lid portion is provided with a groove portion that communicates with the inside and outside of the container when the lid portion is closed. A container with a lid according to any one of claims 1 to 7, wherein:

Images