JP2007302285A - Container having lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container having a lid in which the lid is not returned after the container is heated in a microwave oven and cooled. <P>SOLUTION: In the container 1 having the lid, a container body 2 which is rectangular in plan view and a lid body 3 which is substantially rectangular in plan view are integrated with each other via a connection part 4 formed in a substantially straight shape. The connection part 4 has a slit-like gap part 5A extending from both ends 41 to a predetermined length. The total length L1 along the longitudinal direction of the connection part 4 except the gap part 5A is formed so that the length in the longitudinal direction of the container body 2 and the lid body 3 is less than 50%, preferably, less than 40% with respect to L. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lidded container in which a lid and a container are integrally formed.

In recent years, products such as bento, yakisoba, takoyaki, pilaf, and other foods packed in food packs are heated in a microwave oven at stores such as supermarkets and convenience stores. Due to the increase in the number of singles and dual-income couples, convenience is demanded, and food manufacturers are actively developing foods targeting them. The demand is expected to grow further in the future as taste improves and the variety of variety increases.
Many containers for storing these foods are made of plastic. For example, a lid and a container are connected with a hinge portion, and a container with a lid formed in a single piece is already known and many products are on the market. In addition, various improvements have been made to give further added value to the container of this form.
For example, the appearance of the stored items can be maintained, and the wrap packaging is simple (Patent Document 1), the shape proposal for a double bottom, double lid (Patent Document 2), and the hinge part for improving the sealing performance Further, there are a shape proposal for the flange portion (Patent Document 3) and a shape proposal for preventing movement of the contents (Patent Document 4).

  In addition, many of these food form containers are re-heated in a microwave oven at convenience stores and the like, and improvement inventions of containers at the time of heating have been made. In Patent Document 5, the lid is automatically opened by heating. A lidded container has been developed.

JP-A-4-267755 Japanese Patent Laid-Open No. 4-6035 No. 6-6017 Japanese Utility Model Publication 7-2432 No. 7-1054

However, when the lidded container is heated in a microwave oven or the like and is in a slightly cooled state, if the lid is opened and an attempt is made to eat, there is a problem that the lid returns and is very difficult to eat. This occurs because the lid-covered container is thermally cured by heating with the lid closed and then cooling as it is.
In the containers with lids described in Patent Documents 1 to 5, there is no concept of eliminating the lid return,
When the lid returns, it becomes difficult to eat.

  The objective of this invention is providing the container with a lid | cover which the opened lid body does not return after heating and cooling.

A container with a lid of the present invention includes a container body and a lid, and a part of an opening edge part of the container body and a part of an edge part of the lid body are integrated via a joint part extending in one direction. In the formed container with a lid, an urging force blocking portion for blocking an urging force that the lid body tries to return to the container body is formed along the one direction.
If the container with a lid is heated in a microwave oven or the like with the lid closed and then cooled, even if the lid is opened, the lid is urged in the closing direction by thermosetting and stored in the container body. Contents such as fried noodles are difficult to eat.
According to this invention, since the urging force blocking portion is provided at the connecting portion that connects the container body and the lid body, the urging force of the lid body returning to the container body is blocked by the urging force blocking portion, and the lid body is opened. It will be possible to maintain the state.

In the present invention, the urging force blocking portion is a void portion including an end portion of the connecting portion, and the sum of the dimensions along the one direction of the connecting portion excluding the void portion is the amount of the container body. It is preferably 50% or less of the length dimension along one direction, and more preferably 40% or less.
Here, the void is a hole formed by appropriate means such as a slit or punching (punch).
If the sum of the dimensions of the joints excluding the voids exceeds 50% of the length of the container body, the biasing force is not sufficiently prevented, and the lid return phenomenon, that is, the lid is closed.

The biasing force blocking portion is a gap formed at a predetermined distance from an end of the connecting portion, and a total of dimensions along the one direction of the connecting portion excluding the gap is the container body. The structure which is 40% or less of the length dimension along the said one direction of is preferable.
If the sum of the dimensions of the connecting portion excluding the gap exceeds 40% of the length of the container body, the biasing force is not sufficiently prevented, and a lid return phenomenon occurs.
According to the present invention, since the gap is formed at a predetermined distance from the end of the connecting portion, the connecting portion is not accidentally cracked from the end of the connecting portion. Therefore, it is possible to prevent the lidded container from being accidentally damaged during handling.

It is preferable that the connecting portion has a curved portion continuously formed along the one direction, and the urging force blocking portion is a concave portion provided along the one direction at the top of the curved portion.
According to this invention, since the recess can be formed simultaneously with the molding of the lidded container, labor and manufacturing cost can be reduced.

It is preferable that the connecting portion has a curved portion that is continuously formed along the one direction, and the biasing force blocking portion is a convex portion provided along the one direction at the top of the curved portion.
In this invention, the same effect as when the concave portion is formed on the top of the curved portion can be obtained.

The lidded container is preferably formed from a sheet containing at least one of polypropylene, polystyrene, polystyrene sheet, amorphous polyethylene terephthalate, polyethylene or polyvinyl chloride, or a foamed product thereof.

Here, examples of polypropylene include polypropylene resins such as homopolypropylene, random polypropylene, and block polypropylene, as well as propylene copolymers. One of these may be used alone, or two of these may be used. The above may be used in combination.
In consideration of heating in a microwave oven or the like, it is preferable to use a polypropylene sheet having high heat resistance, and among these materials, transparent polypropylene is used in order to increase visibility in the display at a store such as a convenience store. Is preferred.

Containers with lids have an average spherulite radius of 0.1 μm to 4 μm, an average number of spherulites of the sheet cross section of 600 / mm ² or less, an individual density of 0.895 g / cm ³ or less, and a differential scanning calorimetry (DSC) curve. Low endurance peak enthalpy ΔH of less than 90 J / g, gloss of 90% or more on at least one side, exothermic peak of 1 J / g or more on the low temperature side of the maximum endothermic peak, and a thickness of 50 μm or more It is preferably formed from a crystalline polypropylene sheet.
If the average spherulite radius is larger than 4 μm, the internal haze increases (transparency decreases), which is not preferable. More preferably, the average spherulite radius is 3 μm or less. On the other hand, when the average number of spherulites in the sheet cross section is more than 600 / mm ² , the softening point temperature of the sheet becomes high, which is not preferable. More preferably, the average number of spherulites is 400 / mm ² or less. Furthermore, when the solid density is larger than 0.895 g / cm ³ , the density is too high, that is, the crystallinity is too high, which is not preferable. If the thickness of the sheet is less than 50 μm, it is not preferable because it becomes difficult to produce a molded product (such as a container) having rigidity after thermoforming.
The low crystalline polypropylene sheet in the present invention may be either a single layer sheet of low crystalline polypropylene or a multilayer sheet including a low crystalline polypropylene sheet.

According to the present invention, a nucleating agent-free polypropylene having the properties of an average spherulite radius of 0.1 μm to 4 μm, an average number of spherulites of 600 / mm ² or less, and a solid density of 0.895 g / cm ³ or less. Use a sheet. Therefore, a sheet having a low heat softening point temperature, low temperature thermoforming, and good internal haze (transparency) can be obtained. In addition, since it is not necessary to use a special molding apparatus, the manufacturing cost can be reduced. Furthermore, a container with a lid with high transparency and gloss can be obtained by thermoforming such a low crystalline polypropylene sheet.
Further, since the melting enthalpy ΔH is relatively small as less than 90 J / g, and heat generation of 1 J / g or more is observed on the low temperature side, the amount of heat that must be supplied from the outside to soften the sheet is small, and Since the heating temperature at the time of softening is relatively low, low temperature thermoforming becomes easier. Furthermore, since it is a low crystalline polypropylene sheet having a gloss of 90% or more, the gloss of the sheet is high, and the glossiness of the lidded container obtained by thermoforming the sheet is also high. Get higher.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment, the members denoted by the same reference numerals are omitted or simplified.
First, a first embodiment of the present invention will be described with reference to FIGS.
[First embodiment]
FIG. 1 is a perspective view showing a state in which a lid is closed in the container with a lid according to the first embodiment, and FIG. 2 is a perspective view showing a state in which the lid is opened in the container with a lid according to the first embodiment.

In the outer fitting container of FIGS. 1 and 2, the container 1 with a lid is formed in a substantially linear shape with a container body 2 having a rectangular plane and a lid 3 having a substantially rectangular plane. It is a container that is integrally formed through the connecting portion 4.
The container body 2 has a dish-like portion 2A for storing contents such as fried noodles and a protrusion 22 formed along the periphery of the opening 21 of the dish-like portion 2A. An opening edge 23 is formed along the outer periphery of the protrusion 22.
The lid 3 has an edge 31, and a fitting portion 32 is formed on the inner peripheral side of the edge 31 so as to be fitted with the protrusion 22 of the container body 2 when the lid 3 is closed. . When the lid 3 is closed, the opening edge 23 and the edge 31 are brought into close contact with each other, and the outer peripheral surface and the upper surface of the projection 22 are brought into close contact with the fitting portion 32, whereby the lidded container 1 is completely closed.
At both corners of the edge portion 31 located on the opposite side of the opening portion 21 with respect to the connecting portion 4, mesh-like knob portions 24 and 33 are formed, respectively. These knob portions 24 and 33 are formed in a substantially triangular plane, and the front surface thereof is mesh-shaped. By opening these knob portions 24 and 33 up and down, the lidded container 1 can be opened.

The lidded container 1 is formed from a synthetic resin sheet. Synthetic resins that can be used in this embodiment include polypropylene (PP) such as homopolypropylene, random polypropylene, block polypropylene, polystyrene (PS), polystyrene sheet (OPS), amorphous polyethylene terephthalate (A-PET), polyethylene ( PE), polyvinyl chloride (PVC) and the like can be used alone or in combination of two or more, and those obtained by foaming these synthetic resins are also useful.
As these synthetic resins, those mixed with inorganic fillers such as talc and calcium carbonate can be used.
The synthetic resin sheet thus obtained may be used as a single layer, or may be used as a multilayer structure by combining a plurality of sheets.
As a method for producing such a synthetic resin sheet, a melt web melted with a normal extruder and flattened with a T-die can be obtained by cooling with an air knife method or a touch roll method.

When a low crystalline polypropylene sheet is used as the synthetic resin sheet, the average spherulite radius is 0.1 μm or more and 4 μm or less, preferably 3 μm or less. When the average spherulite radius is larger than 4 μm, the internal haze increases, which is not preferable.
The average number of spherulites in the sheet cross section is 600 pieces / mm ² or less, more preferably 400 pieces / mm ² or less. When the average number of spherulites in the sheet cross section is more than 600 / mm ² , the softening point temperature of the sheet becomes high, which is not preferable.
The solid density of the sheet is 0.895 g / cm ³ or less. If the solid density is greater than 0.895 g / cm ³ , the density is too high, that is, the crystallinity is too high, which is not preferable.

The melting enthalpy ΔH of the maximum endothermic peak of the differential scanning calorimetry (DSC) curve of the synthetic resin sheet is less than 90 J / g, the gloss on at least one side is 90% or more, and 1 J / on the low temperature side of the maximum endothermic peak. It has an exothermic peak of g or more.
Since the melting enthalpy ΔH is relatively small as less than 90 J / g and heat generation of 1 J / g or more is observed on the low temperature side, the amount of heat that must be supplied from the outside to soften the sheet is small, and at the time of softening Since the heating temperature is relatively low, low temperature thermoforming becomes easier. When the gloss of the low crystalline polypropylene sheet is less than 90%, the gloss of the lidded container obtained by thermoforming the sheet is low, and the commercial value of the lidded container itself is lowered.
The thickness of the low crystal polypropylene sheet is 50 μm or more. When the thickness of the sheet is less than 50 μm, the rigidity of the lidded container after thermoforming becomes insufficient.
As a method for producing such a synthetic resin sheet, a method of obtaining a PP melt web melted by an extruder and flattened by a T-die by a belt quenching method (for example, see JP-A-2001-213976) is used. It is particularly good because the visibility is improved.

The principal part of the container 1 with a lid concerning 1st Embodiment is shown by FIG. FIG. 3 is a plan view showing a state in which the lid of the lidded container 1 is opened.
In FIG. 3, the connecting portion 4 is formed to extend in the long side direction between the container body 2 and the lid 3, and the gap portions 5 </ b> A are formed to extend from both end portions 41 to a predetermined length. The gap 5A functions as an urging force blocking unit that blocks the urging force of the lid 3 trying to return to the container body 2. In the first embodiment, each gap 5A is formed as a slit.
In 1st Embodiment, the sum total L1 of the dimension along the longitudinal direction of the connection part 4 except the space | gap part 5A.
The length of the container body 2 and the lid 3 in the long side direction is 50% or less, preferably 40% or less, and 5% or more with respect to L. That is, 0.05 ≦ (L1 / L) ≦ 0.5, preferably 0.05 ≦ (L1 / L) ≦ 0.4.

  Here, when the total length L1 along the longitudinal direction of the joint portion 4 excluding the gap portion 5A exceeds 50% of the length in the long side direction of the container body 2 and the lid body 3 with respect to L, the biasing force Can not be sufficiently prevented, and the biasing force causes the lid to return. In order to reliably prevent the return of the lid, the total L1 excluding the gap 5A of the connecting portion 4 is set to 40% or less with respect to the length L in the long side direction of the container body 2 and the lid 3. Further, in order to prevent the lid 3 from being removed from the container body 2, the ratio of L1 to L is 5% or more.

The lidded container 1 of the first embodiment is manufactured from a synthetic resin sheet by using ordinary vacuum forming, vacuum / pressure forming, hot plate / pressure forming, or the like.
In this manufacturing process, a Thomson blade or the like is used to form the gap portion 5A. However, the gap portion 5A is formed simultaneously with the final punching of the outer periphery of the lidded container 1 formed by normal vacuum forming or the like. Alternatively, it may be a two-stage process in which the gap portion 5A is formed by a Thomson blade or the like and then the outer periphery is finally punched out in the pre-process of the final punching of the outer periphery of the container 1 with the lid. In the first embodiment, a die set, a punch, or the like can be used in place of the Thomson blade to form the gap 5A.

  In the container 1 with the lid thus obtained, the contents such as fried noodles are accommodated in the container body 2 and covered with a lid, and heated in a microwave oven. Thereafter, when the lid 3 is opened with respect to the container body 2 after the lid-equipped container 1 is cooled, the lid 3 is urged in a closing direction with the connecting portion 4 as a rotation center by thermosetting of the container itself. However, in the first embodiment, the biasing force of the lid 3 is blocked by the gap 5A. That is, since the gap portion 5A is formed in the joint portion 4, the force that the lid body 3 tries to return to the container body 2 works only in the portion excluding the gap portion 5A of the joint portion 4, In the portion with the gap 5A, the force that the lid 3 tries to return is not transmitted to the container body 2. Therefore, the urging force that the lid 3 tries to return is blocked by the gap 5A, and the lid 3 is kept open.

Therefore, according to the first embodiment, the following operational effects can be achieved.
(1) A container 1 with a lid in which the container body 2 and the lid body 3 are integrally formed via the connecting portion 4, and the biasing force that prevents the biasing force of the lid body 3 from returning to the container body 2. Since the gap portion 5A is formed as the blocking portion, the biasing force that the lid body 3 tries to return to the container body 2 is blocked by the gap portion 5, and the lid body 2 can be kept open. Therefore, even if the lidded container 1 is heated and then cooled in the microwave oven, the lid does not return, so that the contents such as fried noodles stored in the container body 2 are very easy to eat.

(2) The gap portion 5A has a shape including the end portion of the joint portion 5, and the total L1 along the container long side direction of the joint portion 4 excluding the gap portion 5A is along the long side direction of the container body 2. Therefore, the lid return phenomenon can be surely prevented.
(3) Since the lidded container 1 is formed from a synthetic resin sheet containing at least one of polypropylene, polystyrene, polystyrene sheet, amorphous polyethylene terephthalate, polyethylene or polyvinyl chloride, or a foamed product thereof, The lidded container 1 can withstand heating in a microwave oven.

(4) Since the gap 5A is formed from a slit, the gap 5A is easily formed, and the lidded container 1 can be easily manufactured. Further, since the slit is easy to adjust the slit length by changing the position of the Thomson blade or the like, the slit length is adjusted in accordance with the change in the dimension L in the long side direction of the container body 2, and the gap portion The dimension L1 along the container long side direction of the connecting portion 4 excluding 5A can be made appropriate.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a plan view of the second embodiment. In 2nd Embodiment, it is the structure similar to 1st Embodiment except the shape of the space | gap part 5B formed in the connection part 4. FIG.
In the second embodiment, the gap 5B is punched from the end 41 of the connecting portion 4 to a predetermined length, and its planar shape is an arc.
Also in the second embodiment, as in the first embodiment, the total dimension L1 along the container long side direction of the connecting portion 4 excluding the gap 5B is the length dimension along the long side direction of the container body 2. L is 50% or less, preferably 40% or less.
The gap 5B of the second embodiment can be formed by, for example, a die set.
Therefore, in 2nd Embodiment, there can exist the same effect as 1st Embodiment.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a plan view of the third embodiment. In 3rd Embodiment, it is the structure similar to 1st Embodiment except the shape of the space | gap part 5C formed in the connection part 4. FIG.
In the third embodiment, the gap portion 5 </ b> C is a plurality of slits formed in a perforated shape formed along one direction of the joint portion 4, and the slits located on both sides thereof are the ends of the joint portion 4. Each part 41 is included. When the lengths between adjacent slits are L1, L2, L3, and L4, the total length of L1 + L2 + L3 + L4 is 50% or less, preferably 40% or less of the length L in the long side direction of the container body 2. .
Therefore, in 3rd Embodiment, there can exist an effect similar to 1st Embodiment.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a plan view of the fourth embodiment. In 4th Embodiment, it is the structure similar to 1st Embodiment except the shape of the space | gap part 5D formed in the connection part 4. FIG.
In the fourth embodiment, the gap portion 5 </ b> D is a slit formed inside the connecting portion 4 and does not include the end portion 41 of the connecting portion 4. Here, when the length from one end 41 to one end of the gap 5D is L1, and the length from the other end 41 to the other end of the gap 5D is L2, the gap 5D of the joint 4 is The total length excluding the dimension (L1 + L2) is 40% or less with respect to the length L in the long side direction of the container body 2. If it exceeds 40%, the urging force is not sufficiently blocked, and the lid 3 is closed. Although a lower limit is not specifically defined, it should just be a grade in which the external appearance and functionality of the container 1 with a lid are not inferior, for example, 5% or more is preferable.

Therefore, according to this embodiment, in addition to the same operational effects as (1), (3), and (4) of the first embodiment, the following operational effects can be achieved.
(5) Since the gap 5D is formed with a predetermined dimension away from the end 41 of the connecting portion 4, no cracks are accidentally formed from the end of the connecting portion 4. That is, if the slit including the end 41 is formed, if the force that separates the lid 3 and the container body 2 from each other is applied by mistake, the slit may be cracked, and the lidded container may be damaged. However, in this embodiment, since the slit does not face the end portion 41, such inconvenience can be avoided.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
FIG. 7 is a plan view of the fifth embodiment. In 5th Embodiment, it is the structure similar to 4th Embodiment except the shape of the space | gap part 5E formed in the connection part 4. FIG.
In the present embodiment, the gap 5 </ b> E has a planar oval shape formed inside the connecting portion 4, and does not include the end 41 of the connecting portion 4.
When the length from one end 41 of the joint 4 to one end of the gap 5E is L1, and the length from the other end 41 to the other end of the gap 5E is L2, the gap 5E of the joint 4 The total length excluding (L1 + L2) is 40% or less of the length L of the container body 2 in the long side direction.
The gap 5E of the present embodiment can be formed by punching or the like.
According to this embodiment, there can exist the same effect as 4th Embodiment.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a plan view of the sixth embodiment. In 6th Embodiment, it is the structure similar to 1st Embodiment except the shape of the space | gap part 5F formed in the connection part 4. FIG.
In the present embodiment, the gap 5 </ b> F is a plurality of punches formed intermittently along one direction of the joint 4, and the punches arranged on both sides do not include the end 41. The punching that forms the gap 5F is a circular plane.
Here, the length from one end 41 of the connecting portion 4 to the nearest punching is L1, the length between each punching is L2, L3, L4 in order, the length from the last punching to the other end 41 Assuming that the length is L5, the total length (L1 + L2 + L3 + L4 + L5) excluding the gap portion 5F of the joint portion 4 is 40% or less of the length L in the long side direction of the container body 2.
Therefore, according to this embodiment, the same effect as 5th Embodiment can be show | played by the space | gap part 5F.

[Seventh embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIGS.
9 is a plan view of the seventh embodiment, FIG. 10 is a side view of FIG. 9, and FIG. 11 is an enlarged cross-sectional view of the main part of the seventh embodiment.
In these drawings, a container 1 with a lid includes a container body 2 and a lid body 3 and is integrally formed via a connecting portion 4. The connecting portion 4 has a curved portion 6 continuously formed along the longitudinal direction thereof, that is, the long side direction of the container body 2. A concave portion 7 having a smaller radius of curvature than the curved portion 6 is continuously formed at the top of the curved portion 6. The recess 7 functions as an urging force blocking unit that blocks the urging force of the lid 3 trying to return to the container body 2. That is, after the lidded container 1 is heated and cooled in the microwave oven, when the lid 3 is opened with respect to the container body 2, the lid 3 closes around the connecting portion 4 by the thermosetting of the container itself. Although urged in the direction, the urging force is relaxed by the recess 7 so that the force that the lid 3 tries to return is not transmitted to the container body 2. Therefore, the urging force that the lid 3 tries to return is blocked by the recess 7 and the lid 3 is kept open.

In 7th Embodiment, the recessed part 7 is shape | molded integrally, when shape | molding the container 1 with a lid | cover by normal vacuum forming, vacuum pressure forming, hot plate pressure forming.
According to 7th Embodiment, since the recessed part 7 functions as an urging | biasing force prevention part, in addition to having the same effect as 1st Embodiment, there can exist the following effect.
(6) The connecting portion 4 has a curved portion 6 continuously formed along the longitudinal direction, and the concave portion 7 provided along the longitudinal direction at the top of the curved portion 6 is used as a biasing force blocking portion. Since the concave portion 7 can be formed simultaneously with the formation of the lidded container 1, labor and manufacturing costs can be reduced.

[Eighth embodiment]
Next, an eighth embodiment of the present invention will be described with reference to FIGS. The eighth embodiment is different from the seventh embodiment in that a convex portion is formed instead of the concave portion 7, and the other configuration is the same as that of the seventh embodiment.
12 is a plan view of the eighth embodiment, FIG. 13 is a side view of FIG. 12, and FIG. 14 is an enlarged cross-sectional view of the main part of the eighth embodiment.
In these drawings, the connecting portion 4 has a curved portion 6 continuously formed along the long side direction of the container body 2, and a small convex portion 8 is formed on the top of the curved portion 6. The convex portion 8 functions as an urging force blocking portion that blocks the urging force of the lid 3 trying to return to the container body 2.
In the eighth embodiment, the convex portion 8 is integrally formed when the lidded container 1 is formed by normal vacuum forming, vacuum pressure forming, hot plate pressure forming, or the like.
According to 8th Embodiment, since the convex part 8 functions as an urging | biasing force prevention part, there can exist the same effect as 7th Embodiment.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, although the outer fitting container having the protrusion 22 and the fitting part 32 in the configuration of the lidded container 1 is used, an inner fitting container in which the fitting state of the container body 2 and the lid 3 is reversed may be used. These may be omitted. In this case, when the lid 3 is closed, the opening edge portion 23 and the edge portion 31 are brought into close contact with each other so that the lid body 3 is not opened with a stapler or a tape.

Next, examples will be described in order to confirm the effects of the present invention. In addition, this invention is not limited to these Examples, unless the summary is exceeded.
In each of the embodiments, the container body 2 and the lid body in the state where the longitudinal width dimension (long side direction dimension) of the container body 2 is 185 cm and the lid body 3 of the lidded container 1 is opened (for example, see FIG. 3). The total dimension of the three width dimensions and the width dimension of the connecting portion 4 was 238 cm. The gaps 5A to 5F were formed in the lidded container 1, and the influence of the lid return due to the ratio of the dimensions of the gaps 5A to 5F was confirmed.

[Example 1]
The container with a lid which has the slit-shaped space | gap part 5A containing the edge part of the connection part 4 demonstrated in 1st Embodiment.

[Example 2]
The container with a lid | cover which has the space | gap part 5D which does not contain the edge part of the connection part 4 demonstrated in 4th Embodiment.

For the lidded container 1 having the above-mentioned shape, the slit dimensions were changed, 100 ml of water was put into the container, the lid was closed and heated for one and a half minutes (100 ° C.), and then the lid return evaluation was performed 10 times each. It was. The evaluation contents are shown in Table 1 and Table 2 below.
<Evaluation of lid return>
◯: The lid opened almost 180 °.
X: The lid was closed.
Δ: The lid was closed 5 times.

In Example 1, the lid did not return when the remaining width was 50% or less.
In Example 2, there was a possibility that the lid would return when the remaining width was 43%, and there was no certainty. However, when the remaining width was 40% or less, the lid did not return reliably.

  INDUSTRIAL APPLICATION This invention can be utilized for the container with a lid | cover which accommodates foodstuffs, such as a fried noodle and a lunch box.

The perspective view of the state which closed the lid | cover which shows the container with a lid concerning 1st Embodiment of this invention. The perspective view which shows the state which the lid | cover opened in the container with a lid of 1st Embodiment. The top view which shows the state which opened the lid | cover in the container with a lid concerning 1st Embodiment. The top view which shows 2nd Embodiment of this invention and corresponds to FIG. The top view which shows 3rd Embodiment of this invention and corresponds to FIG. The top view which shows 4th Embodiment of this invention and corresponds to FIG. The top view which shows 5th Embodiment of this invention and corresponds to FIG. The top view which shows 6th Embodiment of this invention and corresponds to FIG. The top view which shows the state which opened the lid | cover in the container with a lid concerning 7th Embodiment of this invention. The side view of FIG. The principal part expanded sectional view of 7th Embodiment. The top view which shows the state which opened the lid | cover in the container with a lid concerning 8th Embodiment of this invention. The side view of FIG. The principal part expanded sectional view of 8th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Container with lid 2 ... Container main body 21 ... Opening part 22 ... Projection part 23 ... Opening edge part 3 ... Lid body 31 ... Edge part 32 ... Fitting part 4 ... Connecting part 41 ... End part 5A, 5B, 5C, 5D 5E, 5F ... void 6 ... curved 7 ... concave 8 ... convex

Claims (7)

A container with a lid, comprising a container body and a lid, wherein a part of the opening edge of the container body and a part of the edge of the lid are integrally formed via a connecting part extending in one direction. And
A container with a lid, wherein a biasing force blocking portion that blocks a biasing force of the lid body from returning to the container body is formed along the one direction. The container with a lid according to claim 1,
The urging force blocking portion is a void portion including an end portion of the connecting portion, and a total dimension along the one direction of the connecting portion excluding the void portion is along the one direction of the container body. A lidded container characterized by being 50% or less of the length dimension. The container with a lid according to claim 1,
The biasing force blocking portion is a gap formed at a predetermined distance from an end of the connecting portion, and a total of dimensions along the one direction of the connecting portion excluding the gap is the container body. The container with a lid is 40% or less of the length dimension along the one direction. The container with a lid according to claim 1,
The connecting portion has a curved portion continuously formed along the one direction, and the urging force blocking portion is a concave portion provided along the one direction at the top of the curved portion. Container with lid. The container with a lid according to claim 1,
The connecting portion has a curved portion continuously formed along the one direction, and the urging force blocking portion is a convex portion provided along the one direction at the top of the curved portion. A container with a lid. The lidded container according to any one of claims 1 to 5,
A container with a lid comprising a sheet containing any one or more of polypropylene, polystyrene, polystyrene sheet, amorphous polyethylene terephthalate, polyethylene or polyvinyl chloride, or a foamed product thereof. The lidded container according to any one of claims 1 to 5,
The average spherulite radius is 0.1 μm or more and 4 μm or less, the average number of spherulites in the sheet cross section is 600 / mm ² or less, the solid density is 0.895 g / cm ³ or less, and melting of the maximum endothermic peak of the differential scanning calorimetry (DSC) curve From a low crystalline polypropylene sheet having an enthalpy ΔH of less than 90 J / g, a gloss of 90% or more on at least one side, an exothermic peak of 1 J / g or more on the low temperature side of the maximum endothermic peak, and a thickness of 50 μm or more. A container with a lid

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